Fixed a regression in DockWidgetTab that caused wron positioning of FloatingDockContainer when moving the mouse

# Conflicts:
#	demo/MainWindow.cpp

.gitattributes

@@ -0,0 +1 @@
+PyQtAds/_version.py export-subst

.github/workflows/linux-builds.yml

@@ -0,0 +1,22 @@
+name: linux-builds
+
+on: [push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, ubuntu-18.04, ubuntu-16.04]
+
+    runs-on: ${{ matrix.os }}
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: install qt
+      run: |
+        sudo apt-get update --fix-missing
+        sudo apt-get install qt5-default
+    - name: qmake
+      run: qmake
+    - name: make
+      run: make -j4

.gitignore

@@ -15,4 +15,5 @@ Makefile
 .eggs
 *.pyc
 *.pyd
-__pycache__
+__pycache__
+PyQtAds/rc.py

CMakeLists.txt

@@ -37,8 +37,11 @@ set(ads_SRCS
     src/DockSplitter.cpp
     src/DockWidget.cpp
     src/DockWidgetTab.cpp
+	src/DockingStateReader.cpp
     src/ElidingLabel.cpp
     src/FloatingDockContainer.cpp
+	src/FloatingDragPreview.cpp
+	src/IconProvider.cpp
     src/ads.qrc
     src/linux/FloatingWidgetTitleBar.cpp
 )
@@ -53,8 +56,11 @@ set(ads_INSTALL_INCLUDE
     src/DockSplitter.h
     src/DockWidget.h
     src/DockWidgetTab.h
+	src/DockingStateReader.h
     src/ElidingLabel.h
     src/FloatingDockContainer.h
+	src/FloatingDragPreview.h
+	src/IconProvider.h
     src/linux/FloatingWidgetTitleBar.h
 )
 if("${CMAKE_SIZEOF_VOID_P}" STREQUAL "4")

MANIFEST.in

@@ -0,0 +1,2 @@
+include versioneer.py
+include PyQtAds/_version.py

PyQtAds/__init__.py

@@ -1 +1,9 @@
-from .rc import *
+from .rc import *
+from ._version import get_versions
+__version__ = get_versions()['version']
+short_version = __version__
+version = __version__
+full_version = __version__
+git_revision = get_versions()['full-revisionid']
+release = not get_versions()['dirty']
+del get_versions

PyQtAds/_version.py

@@ -1,9 +1,520 @@
-# THIS FILE IS GENERATED FROM PyQtAds SETUP.PY
 
-short_version = '2.5.1'
-version = '2.5.1'
-full_version = '2.5.1'
-git_revision = 'c10ff7c688fb50fe9157bad3982164e0f955f9e4'
-release = True
-if not release:
-    version = full_version
+# This file helps to compute a version number in source trees obtained from
+# git-archive tarball (such as those provided by githubs download-from-tag
+# feature). Distribution tarballs (built by setup.py sdist) and build
+# directories (produced by setup.py build) will contain a much shorter file
+# that just contains the computed version number.
+
+# This file is released into the public domain. Generated by
+# versioneer-0.18 (https://github.com/warner/python-versioneer)
+
+"""Git implementation of _version.py."""
+
+import errno
+import os
+import re
+import subprocess
+import sys
+
+
+def get_keywords():
+    """Get the keywords needed to look up the version information."""
+    # these strings will be replaced by git during git-archive.
+    # setup.py/versioneer.py will grep for the variable names, so they must
+    # each be defined on a line of their own. _version.py will just call
+    # get_keywords().
+    git_refnames = "$Format:%d$"
+    git_full = "$Format:%H$"
+    git_date = "$Format:%ci$"
+    keywords = {"refnames": git_refnames, "full": git_full, "date": git_date}
+    return keywords
+
+
+class VersioneerConfig:
+    """Container for Versioneer configuration parameters."""
+
+
+def get_config():
+    """Create, populate and return the VersioneerConfig() object."""
+    # these strings are filled in when 'setup.py versioneer' creates
+    # _version.py
+    cfg = VersioneerConfig()
+    cfg.VCS = "git"
+    cfg.style = "pep440"
+    cfg.tag_prefix = ""
+    cfg.parentdir_prefix = "None"
+    cfg.versionfile_source = "PyQtAds/_version.py"
+    cfg.verbose = False
+    return cfg
+
+
+class NotThisMethod(Exception):
+    """Exception raised if a method is not valid for the current scenario."""
+
+
+LONG_VERSION_PY = {}
+HANDLERS = {}
+
+
+def register_vcs_handler(vcs, method):  # decorator
+    """Create decorator to mark a method as the handler of a VCS."""
+    def decorate(f):
+        """Store f in HANDLERS[vcs][method]."""
+        if vcs not in HANDLERS:
+            HANDLERS[vcs] = {}
+        HANDLERS[vcs][method] = f
+        return f
+    return decorate
+
+
+def run_command(commands, args, cwd=None, verbose=False, hide_stderr=False,
+                env=None):
+    """Call the given command(s)."""
+    assert isinstance(commands, list)
+    p = None
+    for c in commands:
+        try:
+            dispcmd = str([c] + args)
+            # remember shell=False, so use git.cmd on windows, not just git
+            p = subprocess.Popen([c] + args, cwd=cwd, env=env,
+                                 stdout=subprocess.PIPE,
+                                 stderr=(subprocess.PIPE if hide_stderr
+                                         else None))
+            break
+        except EnvironmentError:
+            e = sys.exc_info()[1]
+            if e.errno == errno.ENOENT:
+                continue
+            if verbose:
+                print("unable to run %s" % dispcmd)
+                print(e)
+            return None, None
+    else:
+        if verbose:
+            print("unable to find command, tried %s" % (commands,))
+        return None, None
+    stdout = p.communicate()[0].strip()
+    if sys.version_info[0] >= 3:
+        stdout = stdout.decode()
+    if p.returncode != 0:
+        if verbose:
+            print("unable to run %s (error)" % dispcmd)
+            print("stdout was %s" % stdout)
+        return None, p.returncode
+    return stdout, p.returncode
+
+
+def versions_from_parentdir(parentdir_prefix, root, verbose):
+    """Try to determine the version from the parent directory name.
+
+    Source tarballs conventionally unpack into a directory that includes both
+    the project name and a version string. We will also support searching up
+    two directory levels for an appropriately named parent directory
+    """
+    rootdirs = []
+
+    for i in range(3):
+        dirname = os.path.basename(root)
+        if dirname.startswith(parentdir_prefix):
+            return {"version": dirname[len(parentdir_prefix):],
+                    "full-revisionid": None,
+                    "dirty": False, "error": None, "date": None}
+        else:
+            rootdirs.append(root)
+            root = os.path.dirname(root)  # up a level
+
+    if verbose:
+        print("Tried directories %s but none started with prefix %s" %
+              (str(rootdirs), parentdir_prefix))
+    raise NotThisMethod("rootdir doesn't start with parentdir_prefix")
+
+
+@register_vcs_handler("git", "get_keywords")
+def git_get_keywords(versionfile_abs):
+    """Extract version information from the given file."""
+    # the code embedded in _version.py can just fetch the value of these
+    # keywords. When used from setup.py, we don't want to import _version.py,
+    # so we do it with a regexp instead. This function is not used from
+    # _version.py.
+    keywords = {}
+    try:
+        f = open(versionfile_abs, "r")
+        for line in f.readlines():
+            if line.strip().startswith("git_refnames ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["refnames"] = mo.group(1)
+            if line.strip().startswith("git_full ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["full"] = mo.group(1)
+            if line.strip().startswith("git_date ="):
+                mo = re.search(r'=\s*"(.*)"', line)
+                if mo:
+                    keywords["date"] = mo.group(1)
+        f.close()
+    except EnvironmentError:
+        pass
+    return keywords
+
+
+@register_vcs_handler("git", "keywords")
+def git_versions_from_keywords(keywords, tag_prefix, verbose):
+    """Get version information from git keywords."""
+    if not keywords:
+        raise NotThisMethod("no keywords at all, weird")
+    date = keywords.get("date")
+    if date is not None:
+        # git-2.2.0 added "%cI", which expands to an ISO-8601 -compliant
+        # datestamp. However we prefer "%ci" (which expands to an "ISO-8601
+        # -like" string, which we must then edit to make compliant), because
+        # it's been around since git-1.5.3, and it's too difficult to
+        # discover which version we're using, or to work around using an
+        # older one.
+        date = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+    refnames = keywords["refnames"].strip()
+    if refnames.startswith("$Format"):
+        if verbose:
+            print("keywords are unexpanded, not using")
+        raise NotThisMethod("unexpanded keywords, not a git-archive tarball")
+    refs = set([r.strip() for r in refnames.strip("()").split(",")])
+    # starting in git-1.8.3, tags are listed as "tag: foo-1.0" instead of
+    # just "foo-1.0". If we see a "tag: " prefix, prefer those.
+    TAG = "tag: "
+    tags = set([r[len(TAG):] for r in refs if r.startswith(TAG)])
+    if not tags:
+        # Either we're using git < 1.8.3, or there really are no tags. We use
+        # a heuristic: assume all version tags have a digit. The old git %d
+        # expansion behaves like git log --decorate=short and strips out the
+        # refs/heads/ and refs/tags/ prefixes that would let us distinguish
+        # between branches and tags. By ignoring refnames without digits, we
+        # filter out many common branch names like "release" and
+        # "stabilization", as well as "HEAD" and "master".
+        tags = set([r for r in refs if re.search(r'\d', r)])
+        if verbose:
+            print("discarding '%s', no digits" % ",".join(refs - tags))
+    if verbose:
+        print("likely tags: %s" % ",".join(sorted(tags)))
+    for ref in sorted(tags):
+        # sorting will prefer e.g. "2.0" over "2.0rc1"
+        if ref.startswith(tag_prefix):
+            r = ref[len(tag_prefix):]
+            if verbose:
+                print("picking %s" % r)
+            return {"version": r,
+                    "full-revisionid": keywords["full"].strip(),
+                    "dirty": False, "error": None,
+                    "date": date}
+    # no suitable tags, so version is "0+unknown", but full hex is still there
+    if verbose:
+        print("no suitable tags, using unknown + full revision id")
+    return {"version": "0+unknown",
+            "full-revisionid": keywords["full"].strip(),
+            "dirty": False, "error": "no suitable tags", "date": None}
+
+
+@register_vcs_handler("git", "pieces_from_vcs")
+def git_pieces_from_vcs(tag_prefix, root, verbose, run_command=run_command):
+    """Get version from 'git describe' in the root of the source tree.
+
+    This only gets called if the git-archive 'subst' keywords were *not*
+    expanded, and _version.py hasn't already been rewritten with a short
+    version string, meaning we're inside a checked out source tree.
+    """
+    GITS = ["git"]
+    if sys.platform == "win32":
+        GITS = ["git.cmd", "git.exe"]
+
+    out, rc = run_command(GITS, ["rev-parse", "--git-dir"], cwd=root,
+                          hide_stderr=True)
+    if rc != 0:
+        if verbose:
+            print("Directory %s not under git control" % root)
+        raise NotThisMethod("'git rev-parse --git-dir' returned error")
+
+    # if there is a tag matching tag_prefix, this yields TAG-NUM-gHEX[-dirty]
+    # if there isn't one, this yields HEX[-dirty] (no NUM)
+    describe_out, rc = run_command(GITS, ["describe", "--tags", "--dirty",
+                                          "--always", "--long",
+                                          "--match", "%s*" % tag_prefix],
+                                   cwd=root)
+    # --long was added in git-1.5.5
+    if describe_out is None:
+        raise NotThisMethod("'git describe' failed")
+    describe_out = describe_out.strip()
+    full_out, rc = run_command(GITS, ["rev-parse", "HEAD"], cwd=root)
+    if full_out is None:
+        raise NotThisMethod("'git rev-parse' failed")
+    full_out = full_out.strip()
+
+    pieces = {}
+    pieces["long"] = full_out
+    pieces["short"] = full_out[:7]  # maybe improved later
+    pieces["error"] = None
+
+    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
+    # TAG might have hyphens.
+    git_describe = describe_out
+
+    # look for -dirty suffix
+    dirty = git_describe.endswith("-dirty")
+    pieces["dirty"] = dirty
+    if dirty:
+        git_describe = git_describe[:git_describe.rindex("-dirty")]
+
+    # now we have TAG-NUM-gHEX or HEX
+
+    if "-" in git_describe:
+        # TAG-NUM-gHEX
+        mo = re.search(r'^(.+)-(\d+)-g([0-9a-f]+)$', git_describe)
+        if not mo:
+            # unparseable. Maybe git-describe is misbehaving?
+            pieces["error"] = ("unable to parse git-describe output: '%s'"
+                               % describe_out)
+            return pieces
+
+        # tag
+        full_tag = mo.group(1)
+        if not full_tag.startswith(tag_prefix):
+            if verbose:
+                fmt = "tag '%s' doesn't start with prefix '%s'"
+                print(fmt % (full_tag, tag_prefix))
+            pieces["error"] = ("tag '%s' doesn't start with prefix '%s'"
+                               % (full_tag, tag_prefix))
+            return pieces
+        pieces["closest-tag"] = full_tag[len(tag_prefix):]
+
+        # distance: number of commits since tag
+        pieces["distance"] = int(mo.group(2))
+
+        # commit: short hex revision ID
+        pieces["short"] = mo.group(3)
+
+    else:
+        # HEX: no tags
+        pieces["closest-tag"] = None
+        count_out, rc = run_command(GITS, ["rev-list", "HEAD", "--count"],
+                                    cwd=root)
+        pieces["distance"] = int(count_out)  # total number of commits
+
+    # commit date: see ISO-8601 comment in git_versions_from_keywords()
+    date = run_command(GITS, ["show", "-s", "--format=%ci", "HEAD"],
+                       cwd=root)[0].strip()
+    pieces["date"] = date.strip().replace(" ", "T", 1).replace(" ", "", 1)
+
+    return pieces
+
+
+def plus_or_dot(pieces):
+    """Return a + if we don't already have one, else return a ."""
+    if "+" in pieces.get("closest-tag", ""):
+        return "."
+    return "+"
+
+
+def render_pep440(pieces):
+    """Build up version string, with post-release "local version identifier".
+
+    Our goal: TAG[+DISTANCE.gHEX[.dirty]] . Note that if you
+    get a tagged build and then dirty it, you'll get TAG+0.gHEX.dirty
+
+    Exceptions:
+    1: no tags. git_describe was just HEX. 0+untagged.DISTANCE.gHEX[.dirty]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += plus_or_dot(pieces)
+            rendered += "%d.g%s" % (pieces["distance"], pieces["short"])
+            if pieces["dirty"]:
+                rendered += ".dirty"
+    else:
+        # exception #1
+        rendered = "0+untagged.%d.g%s" % (pieces["distance"],
+                                          pieces["short"])
+        if pieces["dirty"]:
+            rendered += ".dirty"
+    return rendered
+
+
+def render_pep440_pre(pieces):
+    """TAG[.post.devDISTANCE] -- No -dirty.
+
+    Exceptions:
+    1: no tags. 0.post.devDISTANCE
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += ".post.dev%d" % pieces["distance"]
+    else:
+        # exception #1
+        rendered = "0.post.dev%d" % pieces["distance"]
+    return rendered
+
+
+def render_pep440_post(pieces):
+    """TAG[.postDISTANCE[.dev0]+gHEX] .
+
+    The ".dev0" means dirty. Note that .dev0 sorts backwards
+    (a dirty tree will appear "older" than the corresponding clean one),
+    but you shouldn't be releasing software with -dirty anyways.
+
+    Exceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+            rendered += plus_or_dot(pieces)
+            rendered += "g%s" % pieces["short"]
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+        rendered += "+g%s" % pieces["short"]
+    return rendered
+
+
+def render_pep440_old(pieces):
+    """TAG[.postDISTANCE[.dev0]] .
+
+    The ".dev0" means dirty.
+
+    Exceptions:
+    1: no tags. 0.postDISTANCE[.dev0]
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"] or pieces["dirty"]:
+            rendered += ".post%d" % pieces["distance"]
+            if pieces["dirty"]:
+                rendered += ".dev0"
+    else:
+        # exception #1
+        rendered = "0.post%d" % pieces["distance"]
+        if pieces["dirty"]:
+            rendered += ".dev0"
+    return rendered
+
+
+def render_git_describe(pieces):
+    """TAG[-DISTANCE-gHEX][-dirty].
+
+    Like 'git describe --tags --dirty --always'.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        if pieces["distance"]:
+            rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render_git_describe_long(pieces):
+    """TAG-DISTANCE-gHEX[-dirty].
+
+    Like 'git describe --tags --dirty --always -long'.
+    The distance/hash is unconditional.
+
+    Exceptions:
+    1: no tags. HEX[-dirty]  (note: no 'g' prefix)
+    """
+    if pieces["closest-tag"]:
+        rendered = pieces["closest-tag"]
+        rendered += "-%d-g%s" % (pieces["distance"], pieces["short"])
+    else:
+        # exception #1
+        rendered = pieces["short"]
+    if pieces["dirty"]:
+        rendered += "-dirty"
+    return rendered
+
+
+def render(pieces, style):
+    """Render the given version pieces into the requested style."""
+    if pieces["error"]:
+        return {"version": "unknown",
+                "full-revisionid": pieces.get("long"),
+                "dirty": None,
+                "error": pieces["error"],
+                "date": None}
+
+    if not style or style == "default":
+        style = "pep440"  # the default
+
+    if style == "pep440":
+        rendered = render_pep440(pieces)
+    elif style == "pep440-pre":
+        rendered = render_pep440_pre(pieces)
+    elif style == "pep440-post":
+        rendered = render_pep440_post(pieces)
+    elif style == "pep440-old":
+        rendered = render_pep440_old(pieces)
+    elif style == "git-describe":
+        rendered = render_git_describe(pieces)
+    elif style == "git-describe-long":
+        rendered = render_git_describe_long(pieces)
+    else:
+        raise ValueError("unknown style '%s'" % style)
+
+    return {"version": rendered, "full-revisionid": pieces["long"],
+            "dirty": pieces["dirty"], "error": None,
+            "date": pieces.get("date")}
+
+
+def get_versions():
+    """Get version information or return default if unable to do so."""
+    # I am in _version.py, which lives at ROOT/VERSIONFILE_SOURCE. If we have
+    # __file__, we can work backwards from there to the root. Some
+    # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
+    # case we can only use expanded keywords.
+
+    cfg = get_config()
+    verbose = cfg.verbose
+
+    try:
+        return git_versions_from_keywords(get_keywords(), cfg.tag_prefix,
+                                          verbose)
+    except NotThisMethod:
+        pass
+
+    try:
+        root = os.path.realpath(__file__)
+        # versionfile_source is the relative path from the top of the source
+        # tree (where the .git directory might live) to this file. Invert
+        # this to find the root from __file__.
+        for i in cfg.versionfile_source.split('/'):
+            root = os.path.dirname(root)
+    except NameError:
+        return {"version": "0+unknown", "full-revisionid": None,
+                "dirty": None,
+                "error": "unable to find root of source tree",
+                "date": None}
+
+    try:
+        pieces = git_pieces_from_vcs(cfg.tag_prefix, root, verbose)
+        return render(pieces, cfg.style)
+    except NotThisMethod:
+        pass
+
+    try:
+        if cfg.parentdir_prefix:
+            return versions_from_parentdir(cfg.parentdir_prefix, root, verbose)
+    except NotThisMethod:
+        pass
+
+    return {"version": "0+unknown", "full-revisionid": None,
+            "dirty": None,
+            "error": "unable to compute version", "date": None}

PyQtAds/rc.py

@@ -1,670 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# Resource object code
-#
-# Created by: The Resource Compiler for PyQt5 (Qt v5.9.7)
-#
-# WARNING! All changes made in this file will be lost!
-
-from PyQt5 import QtCore
-
-qt_resource_data = b"\
-\x00\x00\x0b\x04\
-\x3c\
-\x3f\x78\x6d\x6c\x20\x76\x65\x72\x73\x69\x6f\x6e\x3d\x22\x31\x2e\
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-\x6e\x6f\x22\x3f\x3e\x0d\x0a\x3c\x21\x2d\x2d\x20\x47\x65\x6e\x65\
-\x72\x61\x74\x6f\x72\x3a\x20\x41\x64\x6f\x62\x65\x20\x49\x6c\x6c\
-\x75\x73\x74\x72\x61\x74\x6f\x72\x20\x31\x36\x2e\x30\x2e\x30\x2c\
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-\x20\x20\x2d\x2d\x3e\x0d\x0a\x0d\x0a\x3c\x73\x76\x67\x0d\x0a\x20\
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-\x00\x64\
-\x00\x65\x00\x66\x00\x61\x00\x75\x00\x6c\x00\x74\x00\x2e\x00\x63\x00\x73\x00\x73\
-"
-
-qt_resource_struct_v1 = b"\
-\x00\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x01\
-\x00\x00\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x02\
-\x00\x00\x00\x28\x00\x02\x00\x00\x00\x02\x00\x00\x00\x06\
-\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x02\x00\x00\x00\x04\
-\x00\x00\x00\x98\x00\x00\x00\x00\x00\x01\x00\x00\x17\x03\
-\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x01\x00\x00\x1d\x68\
-\x00\x00\x00\x60\x00\x00\x00\x00\x00\x01\x00\x00\x0b\x08\
-\x00\x00\x00\x3a\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\
-"
-
-qt_resource_struct_v2 = b"\
-\x00\x00\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x01\
-\x00\x00\x00\x00\x00\x00\x00\x00\
-\x00\x00\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x02\
-\x00\x00\x00\x00\x00\x00\x00\x00\
-\x00\x00\x00\x28\x00\x02\x00\x00\x00\x02\x00\x00\x00\x06\
-\x00\x00\x00\x00\x00\x00\x00\x00\
-\x00\x00\x00\x0c\x00\x02\x00\x00\x00\x02\x00\x00\x00\x04\
-\x00\x00\x00\x00\x00\x00\x00\x00\
-\x00\x00\x00\x98\x00\x00\x00\x00\x00\x01\x00\x00\x17\x03\
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-\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x01\x00\x00\x1d\x68\
-\x00\x00\x01\x6d\xaf\xb0\x91\x60\
-\x00\x00\x00\x60\x00\x00\x00\x00\x00\x01\x00\x00\x0b\x08\
-\x00\x00\x01\x6d\xaf\xb0\x91\x5e\
-\x00\x00\x00\x3a\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\
-\x00\x00\x01\x6d\xaf\xb0\x91\x5e\
-"
-
-qt_version = QtCore.qVersion().split('.')
-if qt_version < ['5', '8', '0']:
-    rcc_version = 1
-    qt_resource_struct = qt_resource_struct_v1
-else:
-    rcc_version = 2
-    qt_resource_struct = qt_resource_struct_v2
-
-def qInitResources():
-    QtCore.qRegisterResourceData(rcc_version, qt_resource_struct, qt_resource_name, qt_resource_data)
-
-def qCleanupResources():
-    QtCore.qUnregisterResourceData(rcc_version, qt_resource_struct, qt_resource_name, qt_resource_data)
-
-qInitResources()

README.md

@@ -3,11 +3,12 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/qcfb3cy932jw9mpy/branch/master?svg=true)](https://ci.appveyor.com/project/githubuser0xFFFF/qt-advanced-docking-system/branch/master)
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)
 
-
-
 Qt Advanced Docking System lets you create customizable layouts using a full 
 featured window docking system similar to what is found in many popular 
-integrated development environements (IDEs) such as Visual Studio. 
+integrated development environments (IDEs) such as Visual Studio. 
+
+[![Video Advanced Docking](doc/advanced-docking_video.png)](https://www.youtube.com/watch?v=7pdNfafg3Qc)
+
 Everything is implemented with standard Qt functionality without any
 platform specific code. Basic usage of QWidgets and QLayouts and using basic 
 styles as much as possible.
@@ -18,11 +19,18 @@ from Manuel Freiholz. I did an almost complete rewrite of his code to improve
 code quality, readibility and to fix all issues from the issue tracker 
 of his docking system project.
 
-The following video gives a first impression what is possible with the Advanced Docking System for Qt.
-
-[![Video Advanced Docking](doc/advanced-docking_video.png)](https://www.youtube.com/watch?v=7pdNfafg3Qc)
-
 ## Features
+### Overview
+- [Docking everywhere - no central widget](#docking-everywhere---no-central-widget)
+- [Docking inside floating windows](#docking-inside-floating-windows)
+- [Grouped dragging](#grouped-dragging)
+- [Perspectives for fast switching of the complete main window layout](#perspectives-for-fast-switching-of-the-complete-main-window-layout)
+- [Opaque and non-opaque splitter resizing](#opaque-and-non-opaque-splitter-resizing)
+- [Opaque and non-opaque undocking](#opaque-and-non-opaque-undocking)
+- [Tab-menu for easy handling of many tabbed dock widgets](#tab-menu-for-easy-handling-of-many-tabbed-dock-widgets)
+- [Many different ways to detach dock widgets](#many-different-ways-to-detach-dock-widgets)
+- [Supports deletion of dynamically created dock widgets](#supports-deletion-of-dynamically-created-dock-widgets)
+
 ### Docking everywhere - no central widget
 There is no central widget like in the Qt docking system. You can dock on every
 border of the main window or you can dock into each dock area - so you are
@@ -45,7 +53,7 @@ When dragging the titlebar of a dock, all the tabs that are tabbed with it are
 going to be dragged. So you can move complete groups of tabbed widgets into
 a floating widget or from one dock area to another one.
 
-![Grouped dragging](doc/grouped-dragging.png)\
+![Grouped dragging](doc/grouped-dragging.gif)\
 \
 ![Grouped dragging](doc/grouped-dragging_dark.png)
 
@@ -56,10 +64,43 @@ perspective to make your own custom perspective. Later you can simply
 select a perspective from the perspective list to quickly switch the complete 
 main window layout.
 
-![Perspective](doc/perspectives.png)\
+![Perspective](doc/perspectives.gif)\
 \
 ![Perspective](doc/perspectives_dark.png)
 
+### Opaque and non-opaque splitter resizing
+The advanced docking system uses standard QSplitters as resize separators and thus supports opaque and non-opaque resizing functionality of QSplitter. In some rare cases, for very complex widgets or on slow machines resizing via separator on the fly may cause flicking and glaring of rendered content inside a widget. The global dock manager flag `OpaqueSplitterResize` configures the resizing behaviour of the splitters. If this flag is set, then widgets are resized dynamically (opaquely) while interactively moving the splitters. 
+
+![Opaque resizing](doc/opaque_resizing.gif)
+
+If this flag is cleared, the widget resizing is deferred until the mouse button is released - this is some kind of lazy resizing separator.
+
+![Non-opaque resizing](doc/non_opaque_resizing.gif)
+
+### Opaque and non-opaque undocking
+By default, opaque undocking is active. That means, as soon as you drag a dock widget or a dock area with a number of dock widgets it will be undocked and moved into a floating widget and then the floating widget will be dragged around. That means undocking will take place immediatelly. You can compare this with opaque splitter resizing. If the flag `OpaqueUndocking` is cleared, then non-opaque undocking is active. In this mode, undocking is more like a standard drag and drop operation. That means, the dragged dock widget or dock area is not undocked immediatelly. Instead, a drag preview widget is created and dragged around to indicate the future position of the dock widget or dock area. The actual dock operation is only executed when the mouse button is released. That makes it possible, to cancel an active drag operation with the escape key.
+
+The drag preview widget can be configured by a number of global dock manager flags:
+- `DragPreviewIsDynamic`: if this flag is enabled, the preview will be adjusted dynamically to the drop area
+- `DragPreviewShowsContentPixmap`: the created drag preview window shows a static copy of the content of the dock widget / dock are that is dragged
+- `DragPreviewHasWindowFrame`: this flag configures if the drag preview is frameless like a QRubberBand or looks like a real window
+
+The best way to test non-opaque undocking is to set the standard flags: `CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig)`.
+
+### Tab-menu for easy handling of many tabbed dock widgets
+Tabs are a good way to quickly switch between dockwidgets in a dockarea. However, if the number of dockwidgets in a dockarea is too large, this may affect the usability of the tab bar. To keep track in this situation, you can use the tab menu. The menu allows you to quickly select the dockwidget you want to activate from a drop down menu.
+
+![Tab menu](doc/tab_menu.gif)
+
+### Many different ways to detach dock widgets
+You can detach dock widgets and also dock areas in the following ways:
+- by dragging the dock widget tab or the dock area title bar
+- by double clicking the tab or title bar
+- by using the detach menu entry from the tab and title bar drop down menu
+
+### Supports deletion of dynamically created dock widgets
+Normally clicking the close button of a dock widget will just hide the widget and the user can show it again using the toggleView() action of the dock widget. This is meant for user interfaces with a static amount of widgets. But the advanced docking system also supports dynamic dock widgets that will get deleted on close. If you set the dock widget flag `DockWidgetDeleteOnClose` for a certain dock widget, then it will be deleted as soon as you close this dock widget. This enables the implementation of user interfaces with dynamically created editors, like in word processing applications or source code development tools.
+
 ## Tested Compatible Environments
 ### Windows
 Windows 10 [![Build status](https://ci.appveyor.com/api/projects/status/qcfb3cy932jw9mpy/branch/master?svg=true)](https://ci.appveyor.com/project/githubuser0xFFFF/qt-advanced-docking-system/branch/master)
@@ -71,12 +112,19 @@ macOS [![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Dockin
 
 The application can be compiled for macOS. A user reported, that the library works on macOS. If have not tested it.
 
+![Advanced Docking on macOS](doc/macos.png)
+
 ### Linux
 Ubuntu [![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
+[![Build status](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/workflows/linux-builds/badge.svg)](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/actions?query=workflow%3Alinux-builds)
 
-The application can be compiled for Linux and has been developed and tested with **Kubuntu 18.04**.
+The application can be compiled for Linux and has been developed and tested with **Kubuntu 18.04** and **Kubuntu 19.10**.
 
-![Advanced Docking on Linux](doc/linux_kubuntu_1804.png)
+![Advanced Docking on Kubuntu Linux](doc/linux_kubuntu_1804.png)
+
+and with **Ubuntu 19.10**
+
+![Advanced Docking on Ubuntu Linux](doc/linux_ubuntu_1910.png)
 
 ## Build
 Open the `ads.pro` with QtCreator and start the build, that's it.
@@ -161,3 +209,17 @@ MainWindow::~MainWindow()
 [![License: LGPL v2.1](https://img.shields.io/badge/License-LGPL%20v2.1-blue.svg)](gnu-lgpl-v2.1.md)
 This project uses the [LGPLv2.1 license](gnu-lgpl-v2.1.md)
 
+## Alternative Docking System Implementations
+If this Qt Advanced Docking System does not fit to your needs you may consider some of the alternative docking system solutions for Qt.
+
+### KDDockWidgets
+This is an advanced docking framework for Qt from [KDAB](https://www.kdab.com/). The interesting thing is, that they separated GUI code from logic, so they can easily provide a QtQuick backend in the future.
+
+- [Blog post about KDDockWidgets](https://www.kdab.com/kddockwidgets/)
+- [GitHub project](https://github.com/KDAB/KDDockWidgets)
+
+
+### QtitanDocking
+This is a commercial component from [Developer Machines](https://www.devmachines.com/) for Qt Framework that allows to create a Microsoft like dockable user interface. They also offer a lot of other interesting and useful components for Qt.
+
+- [Product page](https://www.devmachines.com/qtitandocking-overview.html)

demo/CMakeLists.txt

@@ -19,11 +19,18 @@ set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5Gui_COMPILE_DEFINITI
 set(ads_demo_LIBS ${ads_demo_LIBS} ${Qt5Widgets_LIBRARIES})
 set(ads_demo_INCLUDE ${ads_demo_INCLUDE} ${Qt5Widgets_INCLUDE_DIRS})
 set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5Widgets_COMPILE_DEFINITIONS})
+if(WIN32)
+	find_package(Qt5AxContainer ${REQUIRED_QT_VERSION} REQUIRED)
+	set(ads_demo_LIBS ${ads_demo_LIBS} ${Qt5AxContainer_LIBRARIES})
+	set(ads_demo_INCLUDE ${ads_demo_INCLUDE} ${Qt5AxContainer_INCLUDE_DIRS})
+	set(ads_demo_COMPILE_DEFINE ${ads_demo_COMPILE_DEFINE} ${Qt5AxContainer_COMPILE_DEFINITIONS})
+endif()
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(ads_demo_SRCS
     main.cpp
     MainWindow.cpp
     mainwindow.ui
+	demo.qrc
 )
 add_executable(AdvancedDockingSystemDemo WIN32 ${ads_demo_SRCS})
 if(BUILD_STATIC)

demo/MainWindow.cpp

@@ -50,6 +50,16 @@
 #include <QWidgetAction>
 #include <QComboBox>
 #include <QInputDialog>
+#include <QRubberBand>
+#include <QPlainTextEdit>
+#include <QTableWidget>
+#include <QScreen>
+#include <QStyle>
+#include <QMessageBox>
+
+#ifdef Q_OS_WIN
+#include <QAxWidget>
+#endif
 
 #include <QMap>
 #include <QElapsedTimer>
@@ -57,6 +67,7 @@
 #include "DockManager.h"
 #include "DockWidget.h"
 #include "DockAreaWidget.h"
+#include "FloatingDockContainer.h"
 
 
 //============================================================================
@@ -113,6 +124,18 @@ static void appendFeaturStringToWindowTitle(ads::CDockWidget* DockWidget)
 		+  QString(" (%1)").arg(featuresString(DockWidget)));
 }
 
+/**
+ * Helper function to create an SVG icon
+ */
+static QIcon svgIcon(const QString& File)
+{
+	// This is a workaround, because because in item views SVG icons are not
+	// properly scaled an look blurry or pixelate
+	QIcon SvgIcon(File);
+	SvgIcon.addPixmap(SvgIcon.pixmap(92));
+	return SvgIcon;
+}
+
 
 //============================================================================
 static ads::CDockWidget* createCalendarDockWidget(QMenu* ViewMenu)
@@ -122,6 +145,7 @@ static ads::CDockWidget* createCalendarDockWidget(QMenu* ViewMenu)
 	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Calendar %1").arg(CalendarCount++));
 	DockWidget->setWidget(w);
 	DockWidget->setToggleViewActionMode(ads::CDockWidget::ActionModeShow);
+	DockWidget->setIcon(svgIcon(":/adsdemo/images/date_range.svg"));
 	ViewMenu->addAction(DockWidget->toggleViewAction());
 	return DockWidget;
 }
@@ -143,6 +167,60 @@ static ads::CDockWidget* createFileSystemTreeDockWidget(QMenu* ViewMenu)
     return DockWidget;
 }
 
+//============================================================================
+static ads::CDockWidget* createEditorWidget(QMenu* ViewMenu)
+{
+	static int EditorCount = 0;
+	QPlainTextEdit* w = new QPlainTextEdit();
+	w->setPlaceholderText("This is an editor. If you close the editor, it will be "
+		"deleted. Enter your text here.");
+	w->setStyleSheet("border: none");
+	ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Editor %1").arg(EditorCount++));
+	DockWidget->setWidget(w);
+	DockWidget->setIcon(svgIcon(":/adsdemo/images/edit.svg"));
+	DockWidget->setFeature(ads::CDockWidget::CustomCloseHandling, true);
+	ViewMenu->addAction(DockWidget->toggleViewAction());
+	return DockWidget;
+}
+
+//============================================================================
+static ads::CDockWidget* createTableWidget(QMenu* ViewMenu)
+{
+   static int TableCount = 0;
+   QTableWidget* w = new QTableWidget();
+   ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Table %1").arg(TableCount++));
+   static int colCount = 5;
+   static int rowCount = 30;
+   w->setColumnCount(colCount);
+   w->setRowCount(rowCount);
+   for (int col = 0; col < colCount; ++col)
+   {
+      w->setHorizontalHeaderItem(col, new QTableWidgetItem(QString("Col %1").arg(col+1)));
+      for (int row = 0; row < rowCount; ++row)
+      {
+         w->setItem(row, col, new QTableWidgetItem(QString("T %1-%2").arg(row + 1).arg(col+1)));
+      }
+   }
+   DockWidget->setWidget(w);
+   DockWidget->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
+   ViewMenu->addAction(DockWidget->toggleViewAction());
+   return DockWidget;
+}
+
+
+#ifdef Q_OS_WIN
+//============================================================================
+static ads::CDockWidget* createActiveXWidget(QMenu* ViewMenu, QWidget* parent = nullptr)
+{
+   static int ActiveXCount = 0;
+   QAxWidget* w = new QAxWidget("{6bf52a52-394a-11d3-b153-00c04f79faa6}", parent);
+   ads::CDockWidget* DockWidget = new ads::CDockWidget(QString("Active X %1").arg(ActiveXCount++));
+   DockWidget->setWidget(w);
+   ViewMenu->addAction(DockWidget->toggleViewAction());
+   return DockWidget;
+}
+#endif
+
 
 //============================================================================
 /**
@@ -197,7 +275,6 @@ void MainWindowPrivate::createContent()
 	// Test container docking
 	QMenu* ViewMenu = ui.menuView;
 	auto DockWidget = createCalendarDockWidget(ViewMenu);
-	DockWidget->setIcon(_this->style()->standardIcon(QStyle::SP_DialogOpenButton));
 	DockWidget->setFeature(ads::CDockWidget::DockWidgetClosable, false);
 	DockManager->addDockWidget(ads::LeftDockWidgetArea, DockWidget);
 	DockManager->addDockWidget(ads::LeftDockWidgetArea, createLongTextLabelDockWidget(ViewMenu));
@@ -224,14 +301,23 @@ void MainWindowPrivate::createContent()
 	auto RighDockArea = DockManager->addDockWidget(ads::RightDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), TopDockArea);
 	DockManager->addDockWidget(ads::TopDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	auto BottomDockArea = DockManager->addDockWidget(ads::BottomDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
-	DockManager->addDockWidget(ads::RightDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
+	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
-    //DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
-    //DockManager->addDockWidget(ads::CenterDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), BottomDockArea);
+
+    auto Action = ui.menuView->addAction(QString("Set %1 floating").arg(DockWidget->windowTitle()));
+    DockWidget->connect(Action, SIGNAL(triggered()), SLOT(setFloating()));
+
+#ifdef Q_OS_WIN
+    if (!DockManager->configFlags().testFlag(ads::CDockManager::OpaqueUndocking))
+    {
+    	DockManager->addDockWidget(ads::CenterDockWidgetArea, createActiveXWidget(ViewMenu), RighDockArea);
+    }
+#endif
 
 	for (auto DockWidget : DockManager->dockWidgetsMap())
 	{
 		_this->connect(DockWidget, SIGNAL(viewToggled(bool)), SLOT(onViewToggled(bool)));
+		_this->connect(DockWidget, SIGNAL(visibilityChanged(bool)), SLOT(onViewVisibilityChanged(bool)));
 	}
 }
 
@@ -240,11 +326,13 @@ void MainWindowPrivate::createContent()
 void MainWindowPrivate::createActions()
 {
 	ui.toolBar->addAction(ui.actionSaveState);
-	ui.actionSaveState->setIcon(_this->style()->standardIcon(QStyle::SP_DialogSaveButton));
+	ui.toolBar->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
+	ui.actionSaveState->setIcon(svgIcon(":/adsdemo/images/save.svg"));
 	ui.toolBar->addAction(ui.actionRestoreState);
-	ui.actionRestoreState->setIcon(_this->style()->standardIcon(QStyle::SP_DialogOpenButton));
+	ui.actionRestoreState->setIcon(svgIcon(":/adsdemo/images/restore.svg"));
 
-	SavePerspectiveAction = new QAction("Save Perspective", _this);
+	SavePerspectiveAction = new QAction("Create Perspective", _this);
+	SavePerspectiveAction->setIcon(svgIcon(":/adsdemo/images/picture_in_picture.svg"));
 	_this->connect(SavePerspectiveAction, SIGNAL(triggered()), SLOT(savePerspective()));
 	PerspectiveListAction = new QWidgetAction(_this);
 	PerspectiveComboBox = new QComboBox(_this);
@@ -254,6 +342,16 @@ void MainWindowPrivate::createActions()
 	ui.toolBar->addSeparator();
 	ui.toolBar->addAction(PerspectiveListAction);
 	ui.toolBar->addAction(SavePerspectiveAction);
+
+	QAction* a = ui.toolBar->addAction("Create Editor");
+	a->setToolTip("Creates floating dynamic dockable editor windows that are deleted on close");
+	a->setIcon(svgIcon(":/adsdemo/images/note_add.svg"));
+	_this->connect(a, SIGNAL(triggered()), SLOT(createEditor()));
+
+	a = ui.toolBar->addAction("Create Table");
+	a->setToolTip("Creates floating dynamic dockable table with millions of entries");
+	a->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
+	_this->connect(a, SIGNAL(triggered()), SLOT(createTable()));
 }
 
 
@@ -310,14 +408,19 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// a QToolButton instead of a QPushButton
 	// CDockManager::setConfigFlags(CDockManager::configFlags() | CDockManager::TabCloseButtonIsToolButton);
 
-	// uncomment the following line if you wand a fixed tab width that does
+    // comment the following line if you want to use opaque undocking and
+	// opaque splitter resizing
+    CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig);
+
+    // uncomment the following line if you want a fixed tab width that does
 	// not change if the visibility of the close button changes
-	// CDockManager::setConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden, true);
+    //CDockManager::setConfigFlag(CDockManager::RetainTabSizeWhenCloseButtonHidden, true);
+
 
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
 
-	// Uncomment the following line to have the old style where the dock
+	// uncomment the following line to have the old style where the dock
 	// area close button closes the active tab
 	// CDockManager::setConfigFlags({CDockManager::DockAreaHasCloseButton
 	//	| CDockManager::DockAreaCloseButtonClosesTab});
@@ -325,10 +428,14 @@ CMainWindow::CMainWindow(QWidget *parent) :
 		d->DockManager, SLOT(openPerspective(const QString&)));
 
 	d->createContent();
-	// Default window geometry
+	// Default window geometry - center on screen
     resize(1280, 720);
+    setGeometry(QStyle::alignedRect(
+        Qt::LeftToRight, Qt::AlignCenter, frameSize(),
+        QGuiApplication::primaryScreen()->availableGeometry()
+    ));
 
-	d->restoreState();
+	//d->restoreState();
 	d->restorePerspectives();
 }
 
@@ -395,3 +502,51 @@ void CMainWindow::onViewToggled(bool Open)
 	qDebug() << DockWidget->objectName() << " viewToggled(" << Open << ")";
 }
 
+
+//============================================================================
+void CMainWindow::onViewVisibilityChanged(bool Visible)
+{
+	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
+    if (!DockWidget)
+    {
+        return;
+    }
+
+    qDebug() << DockWidget->objectName() << " visibilityChanged(" << Visible << ")";
+}
+
+
+//============================================================================
+void CMainWindow::createEditor()
+{
+	auto DockWidget = createEditorWidget(d->ui.menuView);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
+	auto FloatingWidget = d->DockManager->addDockWidgetFloating(DockWidget);
+    FloatingWidget->move(QPoint(20, 20));
+    connect(DockWidget, SIGNAL(closeRequested()), SLOT(onEditorCloseRequested()));
+}
+
+
+//============================================================================
+void CMainWindow::onEditorCloseRequested()
+{
+	auto DockWidget = qobject_cast<ads::CDockWidget*>(sender());
+	int Result = QMessageBox::question(this, "Close Editor", QString("Editor %1 "
+		"contains unsaved changes? Would you like to close it?")
+		.arg(DockWidget->windowTitle()));
+	if (QMessageBox::Yes == Result)
+	{
+		DockWidget->closeDockWidget();
+	}
+}
+
+
+//============================================================================
+void CMainWindow::createTable()
+{
+	auto DockWidget = createTableWidget(d->ui.menuView);
+	DockWidget->setFeature(ads::CDockWidget::DockWidgetDeleteOnClose, true);
+	auto FloatingWidget = d->DockManager->addDockWidgetFloating(DockWidget);
+    FloatingWidget->move(QPoint(40, 40));
+}
+

demo/MainWindow.h

@@ -59,6 +59,10 @@ private slots:
 	void on_actionRestoreState_triggered(bool);
 	void savePerspective();
 	void onViewToggled(bool Open);
+	void onViewVisibilityChanged(bool Visible);
+	void createEditor();
+	void createTable();
+	void onEditorCloseRequested();
 };
 
 #endif // MAINWINDOW_H

demo/demo.pro

@@ -3,6 +3,11 @@ ADS_OUT_ROOT = $${OUT_PWD}/..
 TARGET = AdvancedDockingSystemDemo
 DESTDIR = $${ADS_OUT_ROOT}/lib
 QT += core gui widgets
+
+win32 {
+QT += axcontainer
+}
+
 CONFIG += c++14
 CONFIG += debug_and_release
 DEFINES += QT_DEPRECATED_WARNINGS
@@ -20,6 +25,8 @@ HEADERS += \
 
 FORMS += \
 	mainwindow.ui
+	
+RESOURCES += demo.qrc
 
 
 LIBS += -L$${ADS_OUT_ROOT}/lib

demo/demo.qrc

@@ -0,0 +1,13 @@
+<RCC>
+    <qresource prefix="/adsdemo">
+        <file>images/folder.svg</file>
+        <file>images/folder_open.svg</file>
+        <file>images/note_add.svg</file>
+        <file>images/picture_in_picture.svg</file>
+        <file>images/restore.svg</file>
+        <file>images/save.svg</file>
+        <file>images/date_range.svg</file>
+        <file>images/edit.svg</file>
+        <file>images/grid_on.svg</file>
+    </qresource>
+</RCC>

demo/images/date_range.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>date_range icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M896,256v597.33c0,46.93 -38.4,85.34 -85.33,85.34h-597.34c-47.36,0 -85.33,-38.41 -85.33,-85.34l0.43,-597.33c0,-46.93 37.54,-85.33 84.9,-85.33h42.67v-85.34h85.33v85.34h341.34v-85.34h85.33v85.34h42.67c46.93,0 85.33,38.4 85.33,85.33zM810.67,384h-597.34v469.33h597.34zM384,554.67h-85.33v-85.34h85.33zM554.67,554.67h-85.34v-85.34h85.34zM725.33,554.67h-85.33v-85.34h85.33z"/>
+	</g>
+</svg>

demo/images/edit.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>create icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M599.89,264.11l160,160l-471.89,471.89h-160v-160zM805.55,378.45l-160,-160l78.08,-78.08c16.64,-16.64 43.52,-16.64 60.16,0l99.84,99.84c16.64,16.64 16.64,43.52 0,60.16z"/>
+	</g>
+</svg>

demo/images/folder.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>folder icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M512,256h341.33c46.93,0 85.34,38.4 85.34,85.33v426.67c0,46.93 -38.41,85.33 -85.34,85.33h-682.66c-46.93,0 -85.34,-38.4 -85.34,-85.33l0.43,-512c0,-46.93 37.98,-85.33 84.91,-85.33h256z"/>
+	</g>
+</svg>

demo/images/folder_open.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>folder_open icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M938.67,341.33v426.67c0,46.93 -38.41,85.33 -85.34,85.33h-682.66c-46.93,0 -85.34,-38.4 -85.34,-85.33l0.43,-512c0,-46.93 37.98,-85.33 84.91,-85.33h256l85.33,85.33h341.33c46.93,0 85.34,38.4 85.34,85.33zM853.33,341.33h-682.66v426.67h682.66z"/>
+	</g>
+</svg>

demo/images/grid_on.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>grid_on icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M938.67,170.67v682.66c0,46.93 -38.41,85.34 -85.34,85.34h-682.66c-46.93,0 -85.34,-38.41 -85.34,-85.34v-682.66c0,-46.93 38.41,-85.34 85.34,-85.34h682.66c46.93,0 85.34,38.41 85.34,85.34zM341.33,170.67h-170.66v170.66h170.66zM341.33,682.67h-170.66v170.66h170.66zM341.33,426.67h-170.66v170.66h170.66zM597.33,170.67h-170.66v170.66h170.66zM853.33,170.67h-170.66v170.66h170.66zM597.33,682.67h-170.66v170.66h170.66zM597.33,426.67h-170.66v170.66h170.66zM853.33,682.67h-170.66v170.66h170.66zM853.33,426.67h-170.66v170.66h170.66z"/>
+	</g>
+</svg>

demo/images/material_icons_license.txt

@@ -0,0 +1,211 @@
+   The Google Material icons and modifications can be used free of charge for
+   commerical and non-commerical projects according to the Apache License 2.0. 
+   
+   An attribution to https://material.io/icons/ and/or https://iconfu.com on
+   your website or in your app's "about" screen would be wonderful.
+   
+   Please do not re-sell the icons.
+   
+   
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+
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+
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demo/images/note_add.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>note_add icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M853.33,341.33v512c0,46.93 -38.4,85.34 -85.33,85.34h-512.43c-46.93,0 -84.9,-38.41 -84.9,-85.34l0.42,-682.66c0,-46.93 37.98,-85.34 84.91,-85.34h341.33zM682.67,597.33h-128v-128h-85.34v128h-128v85.34h128v128h85.34v-128h128zM789.33,384l-234.66,-234.67v234.67z"/>
+	</g>
+</svg>

demo/images/picture_in_picture.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>picture_in_picture icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M981.33,213.33v597.34c0,46.93 -38.4,84.48 -85.33,84.48h-768c-46.93,0 -85.33,-37.55 -85.33,-84.48v-597.34c0,-46.93 38.4,-85.33 85.33,-85.33h768c46.93,0 85.33,38.4 85.33,85.33zM896,212.48h-768v598.61h768zM810.67,554.67h-341.34v-256h341.34z"/>
+	</g>
+</svg>

demo/images/restore.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>restore icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M938.67,512c0,212.05 -171.95,384 -384,384c-106.24,0 -201.81,-43.09 -271.36,-112.64l60.58,-60.59c53.76,54.19 128.43,87.9 210.78,87.9c165.12,0 298.66,-133.55 298.66,-298.67c0,-165.12 -133.54,-298.67 -298.66,-298.67c-165.12,0 -298.67,133.55 -298.67,298.67h128l-172.37,171.95l-2.99,-5.98l-165.97,-165.97h128c0,-212.05 171.95,-384 384,-384c212.05,0 384,171.95 384,384zM576,341.33v181.34l149.33,88.74l-30.72,51.63l-182.61,-108.37v-213.34z"/>
+	</g>
+</svg>

demo/images/save.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>save icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M896,298.67v512c0,46.93 -38.4,85.33 -85.33,85.33h-597.34c-47.36,0 -85.33,-38.4 -85.33,-85.33v-597.34c0,-46.93 37.97,-85.33 85.33,-85.33h512zM640,213.33h-426.67v170.67h426.67zM640,682.67c0,-70.83 -57.17,-128 -128,-128c-70.83,0 -128,57.17 -128,128c0,70.83 57.17,128 128,128c70.83,0 128,-57.17 128,-128z"/>
+	</g>
+</svg>

setup.cfg

@@ -0,0 +1,7 @@
+[versioneer]
+VCS = git
+style = pep440
+versionfile_source = PyQtAds/_version.py
+versionfile_build  = PyQtAds/_version.py
+tag_prefix =
+

setup.py

@@ -4,20 +4,18 @@ import shlex
 import subprocess
 import glob
 
+import versioneer
+
 from setuptools import setup, find_packages
+from setuptools.command.build_py import build_py
 from setuptools.extension import Extension
-from distutils import sysconfig, dir_util, spawn, log
+from distutils import sysconfig, dir_util, spawn, log, cmd
 from distutils.dep_util import newer
 import sipdistutils
 import sipconfig
 from PyQt5.QtCore import PYQT_CONFIGURATION
 from PyQt5.pyrcc_main import processResourceFile
 
-MAJOR = 2
-MINOR = 5
-MICRO = 1
-ISRELEASED = True
-VERSION = '%d.%d.%d' % (MAJOR, MINOR, MICRO)
 MODULE_NAME = "ads"
 SRC_PATH = "PyQtAds"
     
@@ -220,74 +218,31 @@ class build_ext(sipdistutils.build_ext):
         
         sipdistutils.build_ext.build_extension(self, ext)
 
-        
-def git_version():
-    '''Return the git revision as a string'''
-    
-    def _minimal_ext_cmd(cmd):
-        # construct minimal environment
-        env = {}
-        for k in ['SYSTEMROOT', 'PATH', 'HOME']:
-            v = os.environ.get(k)
-            if v is not None:
-                env[k] = v
-        # LANGUAGE is used on win32
-        env['LANGUAGE'] = 'C'
-        env['LANG'] = 'C'
-        env['LC_ALL'] = 'C'
-        out = subprocess.Popen(cmd, stdout=subprocess.PIPE, env=env).communicate()[0]
-        return out
 
-    try:
-        out = _minimal_ext_cmd(['git', 'rev-parse', 'HEAD'])
-        GIT_REVISION = out.strip().decode('ascii')
-    except OSError:
-        GIT_REVISION = "Unknown"
+class ProcessResourceCommand(cmd.Command):
+    """A custom command to compile the resource file into a Python file"""
 
-    return GIT_REVISION
-  
+    description = "Compile the qrc file into a python file"
 
-def get_version_info():
-    # Adding the git rev number needs to be done inside write_version_py(),
-    # otherwise the import of numpy.version messes up the build under Python 3.
-    FULLVERSION = VERSION
-    if os.path.exists('.git'):
-        GIT_REVISION = git_version()
-    elif os.path.exists(os.path.join(SRC_PATH, 'version.py')):
-        # must be a source distribution, use existing version file
-        try:
-            from PyQtAds.version import git_revision as GIT_REVISION
-        except ImportError:
-            raise ImportError("Unable to import git_revision. Try removing " \
-                              "%(module)/version.py and the build directory " \
-                              "before building." % {'module': SRC_PATH})
-    else:
-        GIT_REVISION = "Unknown"
+    def initialize_options(self):
+        return
 
-    if not ISRELEASED:
-        FULLVERSION += '.dev0+' + GIT_REVISION[:7]
+    def finalize_options(self):
+        return
 
-    return FULLVERSION, GIT_REVISION
-    
+    def run(self):
+        processResourceFile([os.path.join('src', 'ads.qrc')],
+                            os.path.join(SRC_PATH, 'rc.py'), False)
+
+
+class BuildPyCommand(build_py):
+    """Custom build command to include ProcessResource command"""
+
+    def run(self):
+        self.run_command("process_resource")
+        build_py.run(self)
 
-def write_version_py(filename=os.path.join(SRC_PATH, '_version.py')):
-    cnt = ("# THIS FILE IS GENERATED FROM %(module)s SETUP.PY\n\n"
-           "short_version = '%(version)s'\n"
-           "version = '%(version)s'\n"
-           "full_version = '%(full_version)s'\n"
-           "git_revision = '%(git_revision)s'\n"
-           "release = %(isrelease)s\n"
-           "if not release:\n"
-           "    version = full_version\n")
-    FULLVERSION, GIT_REVISION = get_version_info()
 
-    with open(filename, 'w') as f:
-        f.write(cnt % {'module': SRC_PATH,
-                       'version': VERSION,
-                       'full_version': FULLVERSION,
-                       'git_revision': GIT_REVISION,
-                       'isrelease': str(ISRELEASED)})
-  
 setup_requires = ["PyQt5"] if REQUIRE_PYQT else []
 cpp_sources = glob.glob(os.path.join('src', '*.cpp'))
 sip_sources = [os.path.join('sip', MODULE_NAME + '.sip')]
@@ -300,18 +255,15 @@ if sys.platform == 'win32':
     install_requires.append("pywin32")
     
 
-write_version_py(os.path.join(SRC_PATH, '_version.py'))
-processResourceFile([os.path.join('src', 'ads.qrc')],
-                    os.path.join(SRC_PATH, 'rc.py'), False)
 with open('README.md', 'r') as f:
     LONG_DESCRIPTION = f.read()
-    
+
 setup(
     name = SRC_PATH,
     author = "Nicolas Elie",
     author_email = "nicolas.elie@cnrs.fr",
     url = "https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System",
-    version = get_version_info()[0],
+    version = versioneer.get_version(),
     description = "Advanced Docking System for Qt",
     long_description = LONG_DESCRIPTION,
     keywords = ["qt"],
@@ -332,9 +284,9 @@ setup(
                    "Programming Language :: Python :: 3.6",
                    "Programming Language :: Python :: 3.7"],
     ext_modules = ext_modules,
-    cmdclass = {
-        'build_ext': build_ext,
-    },
+    cmdclass = versioneer.get_cmdclass({'process_resource': ProcessResourceCommand,
+                                        'build_py': BuildPyCommand,
+                                        'build_ext': build_ext}),
     packages = find_packages(),
     setup_requires = setup_requires,
     install_requires = install_requires,

sip/DockAreaTabBar.sip

@@ -18,9 +18,10 @@ protected:
 	virtual void mouseMoveEvent(QMouseEvent* ev);
 	virtual void mouseDoubleClickEvent(QMouseEvent *event);
 	void startFloating(const QPoint& Offset);
-	ads::CFloatingDockContainer* makeAreaFloating(const QPoint& Offset,
+	ads::IFloatingWidget* makeAreaFloating(const QPoint& Offset,
 		ads::eDragState DragState);
-    
+    ads::eDragState dragState() const;
+
 public:
 	CDockAreaTabBar(ads::CDockAreaWidget* parent /TransferThis/);
 	virtual ~CDockAreaTabBar();

sip/DockContainerWidget.sip

@@ -23,10 +23,11 @@ protected:
 	QSplitter* rootSplitter() const;
 	void createRootSplitter();
 	void dropFloatingWidget(ads::CFloatingDockContainer* FloatingWidget, const QPoint& TargetPos);
+    void dropWidget(QWidget* widget, const QPoint& TargetPos);
 	void addDockArea(ads::CDockAreaWidget* DockAreaWidget /Transfer/, ads::DockWidgetArea area = ads::CenterDockWidgetArea);
 	void removeDockArea(ads::CDockAreaWidget* area /Transfer/);
 	void saveState(QXmlStreamWriter& Stream) const;
-	bool restoreState(QXmlStreamReader& Stream, bool Testing);
+	bool restoreState(CDockingStateReader& Stream, bool Testing);
 	ads::CDockAreaWidget* lastAddedDockAreaWidget(ads::DockWidgetArea area) const;
 	bool hasTopLevelDockWidget() const;
 	ads::CDockWidget* topLevelDockWidget() const;

sip/DockManager.sip

@@ -152,7 +152,13 @@ public:
 		TabCloseButtonIsToolButton,
 		AllTabsHaveCloseButton,
 		RetainTabSizeWhenCloseButtonHidden,
+        OpaqueUndocking,
+        DragPreviewIsDynamic,
+        DragPreviewShowsContentPixmap,
+        DragPreviewHasWindowFrame,
 		DefaultConfig,
+        DefaultNonOpaqueConfig,
+        NonOpaqueWithWindowFrame,
 	};
     typedef QFlags<ads::CDockManager::eConfigFlag> ConfigFlags;
 
@@ -161,20 +167,22 @@ public:
 	static ads::CDockManager::ConfigFlags configFlags();
 	static void setConfigFlags(const ads::CDockManager::ConfigFlags Flags);
 	static void setConfigFlag(ads::CDockManager::eConfigFlag Flag, bool On = true);
+    static ads::CIconProvider& iconProvider();
 	ads::CDockAreaWidget* addDockWidget(ads::DockWidgetArea area, ads::CDockWidget* Dockwidget /Transfer/,
 		ads::CDockAreaWidget* DockAreaWidget /Transfer/ = 0);
 	ads::CDockAreaWidget* addDockWidgetTab(ads::DockWidgetArea area,
 		ads::CDockWidget* Dockwidget /Transfer/);
 	ads::CDockAreaWidget* addDockWidgetTabToArea(ads::CDockWidget* Dockwidget /Transfer/,
 		ads::CDockAreaWidget* DockAreaWidget /Transfer/);
+    ads::CFloatingDockContainer* addDockWidgetFloating(ads::CDockWidget* DockWidget /Transfer/);
 	ads::CDockWidget* findDockWidget(const QString& ObjectName) const;
 	void removeDockWidget(ads::CDockWidget* Dockwidget) /TransferBack/;
 	QMap<QString, ads::CDockWidget*> dockWidgetsMap() const;
 	const QList<ads::CDockContainerWidget*> dockContainers() const;
 	const QList<ads::CFloatingDockContainer*> floatingWidgets() const;
 	virtual unsigned int zOrderIndex() const;
-	QByteArray saveState(int version = 0) const;
-	bool restoreState(const QByteArray &state, int version = 0);
+	QByteArray saveState(int version = 1) const;
+	bool restoreState(const QByteArray &state, int version = 1);
 	void addPerspective(const QString& UniquePrespectiveName);
 	void removePerspective(const QString& Name);
 	void removePerspectives(const QStringList& Names);
@@ -198,8 +206,11 @@ signals:
     void stateRestored();
     void openingPerspective(const QString& PerspectiveName);
     void perspectiveOpened(const QString& PerspectiveName);
+    void dockAreaCreated(ads::CDockAreaWidget* DockArea);
+    void dockWidgetAboutToBeRemoved(ads::CDockWidget* DockWidget);
+    void dockWidgetRemoved(ads::CDockWidget* DockWidget);
 };
 
 };
 
-%End
+%End

sip/DockWidget.sip

@@ -28,6 +28,7 @@ public:
 		DockWidgetClosable,
 		DockWidgetMovable,
 		DockWidgetFloatable,
+		DockWidgetDeleteOnClose,
 		AllDockWidgetFeatures,
 		NoDockWidgetFeatures
 	};
@@ -88,12 +89,16 @@ public:
 
 public slots:
 	void toggleView(bool Open = true);
+    void setFloating();
+    void deleteDockWidget();
 
 signals:
 	void viewToggled(bool Open);
 	void closed();
 	void titleChanged(const QString& Title);
 	void topLevelChanged(bool topLevel);
+	void visibilityChanged(bool visible);
+    void featuresChanged(ads::CDockWidget::DockWidgetFeatures features);
 };
 
 };

sip/DockingStateReader.sip

@@ -0,0 +1,21 @@
+%If (Qt_5_0_0 -)
+
+namespace ads
+{
+
+class CDockingStateReader : QXmlStreamReader
+{
+
+    %TypeHeaderCode
+    #include <DockingStateReader.h>
+    %End
+
+
+public:
+	void setFileVersion(int FileVersion);
+	int fileVersion() const;
+};
+
+};
+
+%End

sip/FloatingDockContainer.sip

@@ -5,7 +5,22 @@
 namespace ads
 {
 
-class CFloatingDockContainer : QWidget
+class IFloatingWidget
+{
+    %TypeHeaderCode
+    #include <FloatingDockContainer.h>
+    %End
+
+public:
+	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+        ads::eDragState DragState, QWidget* MouseEventHandler) = 0;
+
+	virtual void moveFloating() = 0;
+	virtual void finishDragging() = 0;
+};
+
+
+class CFloatingDockContainer : QWidget, ads::IFloatingWidget
 {
     
     %TypeHeaderCode
@@ -13,14 +28,14 @@ class CFloatingDockContainer : QWidget
     %End
     
 protected:
-	void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
         ads::eDragState DragState, QWidget* MouseEventHandler);
     void startDragging(const QPoint& DragStartMousePos, const QSize& Size,
         QWidget* MouseEventHandler);
-	void finishDragging();
+	virtual void finishDragging();
 	void initFloatingGeometry(const QPoint& DragStartMousePos, const QSize& Size);
 	void moveFloating();
-	bool restoreState(QXmlStreamReader& Stream, bool Testing);
+	bool restoreState(ads::CDockingStateReader& Stream, bool Testing);
 	void updateWindowTitle();
 
 

sip/FloatingDragPreview.sip

@@ -0,0 +1,38 @@
+%Import QtWidgets/QtWidgetsmod.sip
+
+%If (Qt_5_0_0 -)
+
+namespace ads
+{
+
+class CFloatingDragPreview : QWidget, ads::IFloatingWidget
+{
+
+    %TypeHeaderCode
+    #include <FloatingDragPreview.h>
+    %End
+
+
+public:
+    CFloatingDragPreview(ads::CDockWidget* Content /TransferThis/ );
+    CFloatingDragPreview(ads::CDockAreaWidget* Content /TransferThis/ );
+
+    virtual ~CFloatingDragPreview();
+
+    virtual bool eventFilter(QObject* watched, QEvent* event);
+
+    virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+        ads::eDragState DragState, QWidget* MouseEventHandler);
+
+    virtual void moveFloating();
+
+    virtual void finishDragging();
+
+signals:
+    void draggingCanceled();
+
+};
+
+};
+
+%End

sip/IconProvider.sip

@@ -0,0 +1,28 @@
+%Import QtWidgets/QtWidgetsmod.sip
+
+%If (Qt_5_0_0 -)
+
+namespace ads
+{
+
+class CIconProvider
+{
+
+    %TypeHeaderCode
+    #include <IconProvider.h>
+    %End
+
+
+public:
+    CIconProvider();
+
+  	virtual ~CIconProvider();
+
+    QIcon customIcon(eIcon IconId);
+
+    void registerCustomIcon(eIcon IconId, const QIcon& icon /TransferThis/ );
+};
+
+};
+
+%End

sip/ads.sip

@@ -9,12 +9,15 @@
 %Include DockAreaTitleBar.sip
 %Include DockAreaWidget.sip
 %Include DockContainerWidget.sip
+%Include DockingStateReader.sip
 %Include DockManager.sip
 %Include DockOverlay.sip
 %Include DockSplitter.sip
 %Include DockWidgetTab.sip
 %Include ElidingLabel.sip
 %Include FloatingDockContainer.sip
+%Include FloatingDragPreview.sip
+%Include IconProvider.sip
 %If (Linux)
     %Include linux/FloatingWidgetTitleBar.sip
 %End

sip/ads_globals.sip

@@ -39,6 +39,16 @@ namespace ads
         DraggingFloatingWidget
     };
 
+    enum eIcon
+    {
+        TabCloseIcon,
+        DockAreaMenuIcon,
+        DockAreaUndockIcon,
+        DockAreaCloseIcon,
+
+        IconCount,
+    };
+
 };
 
 %End

src/DockAreaTabBar.cpp

@@ -27,6 +27,7 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
+#include <FloatingDragPreview.h>
 #include "DockAreaTabBar.h"
 
 #include <QMouseEvent>
@@ -55,10 +56,11 @@ struct DockAreaTabBarPrivate
 	CDockAreaTabBar* _this;
 	QPoint DragStartMousePos;
 	CDockAreaWidget* DockArea;
-	CFloatingDockContainer* FloatingWidget = nullptr;
+	IFloatingWidget* FloatingWidget = nullptr;
 	QWidget* TabsContainerWidget;
 	QBoxLayout* TabsLayout;
 	int CurrentIndex = -1;
+	eDragState DragState = DraggingInactive;
 
 	/**
 	 * Private data constructor
@@ -70,6 +72,14 @@ struct DockAreaTabBarPrivate
 	 * The function reassigns the stylesheet to update the tabs
 	 */
 	void updateTabs();
+
+	/**
+	 * Test function for current drag state
+	 */
+	bool isDraggingState(eDragState dragState) const
+	{
+		return this->DragState == dragState;
+	}
 };
 // struct DockAreaTabBarPrivate
 
@@ -160,9 +170,10 @@ void CDockAreaTabBar::mousePressEvent(QMouseEvent* ev)
 	{
 		ev->accept();
 		d->DragStartMousePos = ev->pos();
+		d->DragState = DraggingMousePressed;
 		return;
 	}
-	QScrollArea::mousePressEvent(ev);
+	Super::mousePressEvent(ev);
 }
 
 
@@ -171,30 +182,37 @@ void CDockAreaTabBar::mouseReleaseEvent(QMouseEvent* ev)
 {
 	if (ev->button() == Qt::LeftButton)
 	{
-        ADS_PRINT("CTabsScrollArea::mouseReleaseEvent");
+        ADS_PRINT("CDockAreaTabBar::mouseReleaseEvent");
 		ev->accept();
-		d->FloatingWidget = nullptr;
+		auto CurrentDragState = d->DragState;
 		d->DragStartMousePos = QPoint();
+		d->DragState = DraggingInactive;
+		if (DraggingFloatingWidget == CurrentDragState)
+		{
+			d->FloatingWidget->finishDragging();
+		}
 		return;
 	}
-	QScrollArea::mouseReleaseEvent(ev);
+	Super::mouseReleaseEvent(ev);
 }
 
 
 //============================================================================
 void CDockAreaTabBar::mouseMoveEvent(QMouseEvent* ev)
 {
-	QScrollArea::mouseMoveEvent(ev);
-	if (ev->buttons() != Qt::LeftButton)
+	Super::mouseMoveEvent(ev);
+	if (!(ev->buttons() & Qt::LeftButton) || d->isDraggingState(DraggingInactive))
 	{
+		d->DragState = DraggingInactive;
 		return;
 	}
 
-	if (d->FloatingWidget)
-	{
-		d->FloatingWidget->moveFloating();
-		return;
-	}
+    // move floating window
+    if (d->isDraggingState(DraggingFloatingWidget))
+    {
+        d->FloatingWidget->moveFloating();
+        return;
+    }
 
 	// If this is the last dock area in a dock container it does not make
 	// sense to move it to a new floating widget and leave this one
@@ -245,17 +263,37 @@ void CDockAreaTabBar::mouseDoubleClickEvent(QMouseEvent *event)
 
 
 //============================================================================
-CFloatingDockContainer* CDockAreaTabBar::makeAreaFloating(const QPoint& Offset,
-	eDragState DragState)
+IFloatingWidget* CDockAreaTabBar::makeAreaFloating(const QPoint& Offset, eDragState DragState)
 {
 	QSize Size = d->DockArea->size();
-	CFloatingDockContainer* FloatingWidget = new CFloatingDockContainer(d->DockArea);
-    FloatingWidget->startFloating(Offset, Size, DragState, nullptr);
-	auto TopLevelDockWidget = FloatingWidget->topLevelDockWidget();
-	if (TopLevelDockWidget)
+	d->DragState = DragState;
+	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
+		(DraggingFloatingWidget != DragState);
+	CFloatingDockContainer* FloatingDockContainer = nullptr;
+	IFloatingWidget* FloatingWidget;
+	if (OpaqueUndocking)
 	{
-		TopLevelDockWidget->emitTopLevelChanged(true);
+		FloatingWidget = FloatingDockContainer = new CFloatingDockContainer(d->DockArea);
 	}
+	else
+	{
+		auto w = new CFloatingDragPreview(d->DockArea);
+		connect(w, &CFloatingDragPreview::draggingCanceled, [=]()
+		{
+			d->DragState = DraggingInactive;
+		});
+		FloatingWidget = w;
+	}
+
+    FloatingWidget->startFloating(Offset, Size, DragState, nullptr);
+    if (FloatingDockContainer)
+    {
+		auto TopLevelDockWidget = FloatingDockContainer->topLevelDockWidget();
+		if (TopLevelDockWidget)
+		{
+			TopLevelDockWidget->emitTopLevelChanged(true);
+		}
+    }
 
 	return FloatingWidget;
 }
@@ -434,7 +472,20 @@ void CDockAreaTabBar::onCloseOtherTabsRequested()
 		auto Tab = tab(i);
 		if (Tab->isClosable() && !Tab->isHidden() && Tab != Sender)
 		{
+			// If the dock widget is deleted with the closeTab() call, its tab
+			// it will no longer be in the layout, and thus the index needs to
+			// be updated to not skip any tabs
+			int Offset = Tab->dockWidget()->features().testFlag(
+				CDockWidget::DockWidgetDeleteOnClose) ? 1 : 0;
 			closeTab(i);
+
+			// If the the dock widget blocks closing, i.e. if the flag
+			// CustomCloseHandling is set, and the dock widget is still open,
+			// then we do not need to correct the index
+			if (Tab->dockWidget()->isClosed())
+			{
+				i -= Offset;
+			}
 		}
 	}
 }
@@ -525,7 +576,7 @@ void CDockAreaTabBar::closeTab(int Index)
 	{
 		return;
 	}
-	Tab->hide();
+	//Tab->hide();
 	emit tabCloseRequested(Index);
 }
 
@@ -574,6 +625,7 @@ QSize CDockAreaTabBar::minimumSizeHint() const
 	return Size;
 }
 
+
 //===========================================================================
 QSize CDockAreaTabBar::sizeHint() const
 {
@@ -582,6 +634,13 @@ QSize CDockAreaTabBar::sizeHint() const
 	return Size;
 }
 
+
+//===========================================================================
+eDragState CDockAreaTabBar::dragState() const
+{
+	return d->DragState;
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockAreaTabBar.h

@@ -39,6 +39,7 @@ class CDockWidgetTab;
 struct DockAreaTabBarPrivate;
 class CDockAreaTitleBar;
 class CFloatingDockContainer;
+class IFloatingWidget;
 
 /**
  * Custom tabbar implementation for tab area that is shown on top of a
@@ -95,8 +96,12 @@ protected:
 	/**
 	 * Makes the dock area floating
 	 */
-	CFloatingDockContainer* makeAreaFloating(const QPoint& Offset,
-		eDragState DragState);
+	IFloatingWidget* makeAreaFloating(const QPoint& Offset, eDragState DragState);
+
+	/**
+	 * Returns the current drag state
+	 */
+	eDragState dragState() const;
 
 
 public:

src/DockAreaTitleBar.cpp

@@ -46,6 +46,7 @@
 #include "DockWidget.h"
 #include "DockWidgetTab.h"
 #include "DockAreaTabBar.h"
+#include "IconProvider.h"
 
 #include <iostream>
 
@@ -101,14 +102,24 @@ struct DockAreaTitleBarPrivate
     /**
      * Helper function to set title bar button icons depending on operating
      * system and to avoid duplicated code. On windows the standard icons
-     * are blurry since Qt 5.11 so we need to do some additional steps
+     * are blurry since Qt 5.11 so we need to do some additional steps.
+     * If the global IconPovider of the dockmanager provides a custom
+     * Icon for the given CustomIconId, the this icon will be used.
      */
-    void setTitleBarButtonIcon(tTileBarButton* Button, QStyle::StandardPixmap StandarPixmap)
+    void setTitleBarButtonIcon(tTileBarButton* Button, QStyle::StandardPixmap StandarPixmap,
+    	ads::eIcon CustomIconId)
     {
+    	// First we try to use custom icons if available
+    	QIcon Icon = CDockManager::iconProvider().customIcon(CustomIconId);
+    	if (!Icon.isNull())
+    	{
+    		Button->setIcon(Icon);
+    		return;
+    	}
+
     #ifdef Q_OS_LINUX
         Button->setIcon(_this->style()->standardIcon(StandarPixmap));
     #else
-        QIcon Icon;
         QPixmap normalPixmap = _this->style()->standardPixmap(StandarPixmap, 0, Button);
         Icon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
         Icon.addPixmap(normalPixmap, QIcon::Normal);
@@ -136,7 +147,7 @@ void DockAreaTitleBarPrivate::createButtons()
 	TabsMenuButton->setObjectName("tabsMenuButton");
 	TabsMenuButton->setAutoRaise(true);
 	TabsMenuButton->setPopupMode(QToolButton::InstantPopup);
-    setTitleBarButtonIcon(TabsMenuButton, QStyle::SP_TitleBarUnshadeButton);
+    setTitleBarButtonIcon(TabsMenuButton, QStyle::SP_TitleBarUnshadeButton, ads::DockAreaMenuIcon);
 	QMenu* TabsMenu = new QMenu(TabsMenuButton);
 #ifndef QT_NO_TOOLTIP
 	TabsMenu->setToolTipsVisible(true);
@@ -159,7 +170,7 @@ void DockAreaTitleBarPrivate::createButtons()
 #ifndef QT_NO_TOOLTIP
 	UndockButton->setToolTip(QObject::tr("Detach Group"));
 #endif
-    setTitleBarButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton);
+    setTitleBarButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton, ads::DockAreaUndockIcon);
     UndockButton->setSizePolicy(ButtonSizePolicy);
 	TopLayout->addWidget(UndockButton, 0);
 	_this->connect(UndockButton, SIGNAL(clicked()), SLOT(onUndockButtonClicked()));
@@ -169,7 +180,7 @@ void DockAreaTitleBarPrivate::createButtons()
 	CloseButton = new tTileBarButton();
 	CloseButton->setObjectName("closeButton");
 	CloseButton->setAutoRaise(true);
-    setTitleBarButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton);
+    setTitleBarButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
 #ifndef QT_NO_TOOLTIP
 	if (testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
 	{
@@ -353,6 +364,11 @@ void CDockAreaTitleBar::setVisible(bool Visible)
 //============================================================================
 void CDockAreaTitleBar::showContextMenu(const QPoint& pos)
 {
+	if (d->TabBar->dragState() == DraggingFloatingWidget)
+	{
+		return;
+	}
+
 	QMenu Menu(this);
 	auto Action = Menu.addAction(tr("Detach Area"), this, SLOT(onUndockButtonClicked()));
 	Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable));

src/DockAreaWidget.cpp

@@ -354,6 +354,10 @@ CDockAreaWidget::CDockAreaWidget(CDockManager* DockManager, CDockContainerWidget
 
 	d->createTitleBar();
 	d->ContentsLayout = new DockAreaLayout(d->Layout);
+	if (d->DockManager)
+	{
+		emit d->DockManager->dockAreaCreated(this);
+	}
 }
 
 //============================================================================
@@ -487,7 +491,16 @@ void CDockAreaWidget::hideAreaWithNoVisibleContent()
 void CDockAreaWidget::onTabCloseRequested(int Index)
 {
     ADS_PRINT("CDockAreaWidget::onTabCloseRequested " << Index);
-	dockWidget(Index)->toggleView(false);
+    auto* DockWidget = dockWidget(Index);
+    if (DockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+    {
+    	//DockWidget->deleteDockWidget();
+    	DockWidget->closeDockWidgetInternal();
+    }
+    else
+    {
+    	DockWidget->toggleView(false);
+    }
 }
 
 
@@ -539,6 +552,13 @@ void CDockAreaWidget::setCurrentIndex(int index)
 		return;
     }
 
+	auto cw = d->ContentsLayout->currentWidget();
+	auto nw = d->ContentsLayout->widget(index);
+	if (cw == nw && !nw->isHidden())
+	{
+		return;
+	}
+
     emit currentChanging(index);
     TabBar->setCurrentIndex(index);
 	d->ContentsLayout->setCurrentIndex(index);
@@ -745,15 +765,26 @@ CDockWidget* CDockAreaWidget::nextOpenDockWidget(CDockWidget* DockWidget) const
 
 
 //============================================================================
-CDockWidget::DockWidgetFeatures CDockAreaWidget::features() const
+CDockWidget::DockWidgetFeatures CDockAreaWidget::features(eBitwiseOperator Mode) const
 {
-	CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
-	for (const auto DockWidget : dockWidgets())
+	if (BitwiseAnd == Mode)
 	{
-		Features &= DockWidget->features();
+		CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
+		for (const auto DockWidget : dockWidgets())
+		{
+			Features &= DockWidget->features();
+		}
+		return Features;
+	}
+	else
+	{
+		CDockWidget::DockWidgetFeatures Features(CDockWidget::NoDockWidgetFeatures);
+		for (const auto DockWidget : dockWidgets())
+		{
+			Features |= DockWidget->features();
+		}
+		return Features;
 	}
-
-	return Features;
 }
 
 
@@ -787,9 +818,19 @@ QAbstractButton* CDockAreaWidget::titleBarButton(TitleBarButton which) const
 //============================================================================
 void CDockAreaWidget::closeArea()
 {
-	for (auto DockWidget : openedDockWidgets())
+	// If there is only one single dock widget and this widget has the
+	// DeleteOnClose feature, then we delete the dock widget now
+	auto OpenDockWidgets = openedDockWidgets();
+	if (OpenDockWidgets.count() == 1 && OpenDockWidgets[0]->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
 	{
-		DockWidget->toggleView(false);
+		OpenDockWidgets[0]->closeDockWidgetInternal();
+	}
+	else
+	{
+		for (auto DockWidget : openedDockWidgets())
+		{
+			DockWidget->toggleView(false);
+		}
 	}
 }
 

src/DockAreaWidget.h

@@ -63,6 +63,7 @@ private:
 	friend struct DockWidgetPrivate;
 	friend class CDockWidget;
 	friend struct DockManagerPrivate;
+	friend class CDockManager;
 
 private slots:
 	void onTabCloseRequested(int Index);
@@ -130,7 +131,6 @@ protected:
 	 */
 	void internalSetCurrentDockWidget(CDockWidget* DockWidget);
 
-
 	/**
 	 * Marks tabs menu to update
 	 */
@@ -238,10 +238,10 @@ public:
 	 * A bitwise and is used to combine the flags of all dock widgets. That
 	 * means, if only one single dock widget does not support a certain flag,
 	 * the whole dock are does not support the flag. I.e. if one single
-	 * dock widget in this area is not closabe, the whole dock are is not
+	 * dock widget in this area is not closable, the whole dock are is not
 	 * closable.
 	 */
-	CDockWidget::DockWidgetFeatures features() const;
+	CDockWidget::DockWidgetFeatures features(eBitwiseOperator Mode = BitwiseAnd) const;
 
 	/**
 	 * Returns the title bar button corresponding to the given title bar

src/DockContainerWidget.cpp

@@ -42,6 +42,7 @@
 #include "DockManager.h"
 #include "DockAreaWidget.h"
 #include "DockWidget.h"
+#include "DockingStateReader.h"
 #include "FloatingDockContainer.h"
 #include "DockOverlay.h"
 #include "ads_globals.h"
@@ -81,6 +82,12 @@ namespace ads
 {
 static unsigned int zOrderCounter = 0;
 
+enum eDropMode
+{
+	DropModeIntoArea,///< drop widget into a dock area
+	DropModeIntoContainer,///< drop into container
+	DropModeInvalid///< invalid mode - do not drop
+};
 
 /**
  * Converts dock area ID to an index for array access
@@ -164,12 +171,30 @@ public:
 	void dropIntoSection(CFloatingDockContainer* FloatingWidget,
 		CDockAreaWidget* TargetArea, DockWidgetArea area);
 
+	/**
+	 * Moves the dock widget or dock area given in Widget parameter to a
+	 * new dock widget area
+	 */
+	void moveToNewSection(QWidget* Widget, CDockAreaWidget* TargetArea, DockWidgetArea area);
+
+	/**
+	 * Moves the dock widget or dock area given in Widget parameter to a
+	 * a dock area in container
+	 */
+	void moveToContainer(QWidget* Widgett, DockWidgetArea area);
+
 	/**
 	 * Creates a new tab for a widget dropped into the center of a section
 	 */
 	void dropIntoCenterOfSection(CFloatingDockContainer* FloatingWidget,
 		CDockAreaWidget* TargetArea);
 
+	/**
+	 * Creates a new tab for a widget dropped into the center of a section
+	 */
+	void moveIntoCenterOfSection(QWidget* Widget, CDockAreaWidget* TargetArea);
+
+
 	/**
 	 * Adds new dock areas to the internal dock area list
 	 */
@@ -194,21 +219,21 @@ public:
 	 * \param[in] Testing If Testing is true, only the stream data is
 	 * parsed without modifiying anything.
 	 */
-	bool restoreChildNodes(QXmlStreamReader& Stream, QWidget*& CreatedWidget,
+	bool restoreChildNodes(CDockingStateReader& Stream, QWidget*& CreatedWidget,
 		bool Testing);
 
 	/**
 	 * Restores a splitter.
 	 * \see restoreChildNodes() for details
 	 */
-	bool restoreSplitter(QXmlStreamReader& Stream, QWidget*& CreatedWidget,
+	bool restoreSplitter(CDockingStateReader& Stream, QWidget*& CreatedWidget,
 		bool Testing);
 
 	/**
 	 * Restores a dock area.
 	 * \see restoreChildNodes() for details
 	 */
-	bool restoreDockArea(QXmlStreamReader& Stream, QWidget*& CreatedWidget,
+	bool restoreDockArea(CDockingStateReader& Stream, QWidget*& CreatedWidget,
 		bool Testing);
 
 	/**
@@ -216,6 +241,11 @@ public:
 	 */
 	void dumpRecursive(int level, QWidget* widget);
 
+	/**
+	 * Calculate the drop mode from the given target position
+	 */
+	eDropMode getDropMode(const QPoint& TargetPos);
+
 	/**
 	 * Initializes the visible dock area count variable if it is not initialized
 	 * yet
@@ -294,6 +324,46 @@ DockContainerWidgetPrivate::DockContainerWidgetPrivate(CDockContainerWidget* _pu
 }
 
 
+//============================================================================
+eDropMode DockContainerWidgetPrivate::getDropMode(const QPoint& TargetPos)
+{
+	CDockAreaWidget* DockArea = _this->dockAreaAt(TargetPos);
+	auto dropArea = InvalidDockWidgetArea;
+	auto ContainerDropArea = DockManager->containerOverlay()->dropAreaUnderCursor();
+
+	if (DockArea)
+	{
+		auto dropOverlay = DockManager->dockAreaOverlay();
+		dropOverlay->setAllowedAreas(AllDockAreas);
+		dropArea = dropOverlay->showOverlay(DockArea);
+		if (ContainerDropArea != InvalidDockWidgetArea &&
+			ContainerDropArea != dropArea)
+		{
+			dropArea = InvalidDockWidgetArea;
+		}
+
+		if (dropArea != InvalidDockWidgetArea)
+		{
+            ADS_PRINT("Dock Area Drop Content: " << dropArea);
+            return DropModeIntoArea;
+		}
+	}
+
+	// mouse is over container
+	if (InvalidDockWidgetArea == dropArea)
+	{
+		dropArea = ContainerDropArea;
+        ADS_PRINT("Container Drop Content: " << dropArea);
+		if (dropArea != InvalidDockWidgetArea)
+		{
+			return DropModeIntoContainer;
+		}
+	}
+
+	return DropModeInvalid;
+}
+
+
 //============================================================================
 void DockContainerWidgetPrivate::onVisibleDockAreaCountChanged()
 {
@@ -322,8 +392,6 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 	CDockContainerWidget* FloatingDockContainer = FloatingWidget->dockContainer();
 	auto NewDockAreas = FloatingDockContainer->findChildren<CDockAreaWidget*>(
 		QString(), Qt::FindChildrenRecursively);
-	CDockWidget* SingleDroppedDockWidget = FloatingDockContainer->topLevelDockWidget();
-	CDockWidget* SingleDockWidget = _this->topLevelDockWidget();
 	QSplitter* Splitter = RootSplitter;
 
 	if (DockAreas.count() <= 1)
@@ -359,9 +427,6 @@ void DockContainerWidgetPrivate::dropIntoContainer(CFloatingDockContainer* Float
 
 	RootSplitter = Splitter;
 	addDockAreasToList(NewDockAreas);
-	FloatingWidget->deleteLater();
-	CDockWidget::emitTopLevelEventForWidget(SingleDroppedDockWidget, false);
-	CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
 
 	// If we dropped the floating widget into the main dock container that does
 	// not contain any dock widgets, then splitter is invisible and we need to
@@ -404,7 +469,6 @@ void DockContainerWidgetPrivate::dropIntoCenterOfSection(
 		}
 	}
 	TargetArea->setCurrentIndex(NewCurrentIndex);
-	FloatingWidget->deleteLater();
 	TargetArea->updateTitleBarVisibility();
 	return;
 }
@@ -497,12 +561,133 @@ void DockContainerWidgetPrivate::dropIntoSection(CFloatingDockContainer* Floatin
 		TargetAreaSplitter->setSizes(Sizes);
 	}
 
-	FloatingWidget->deleteLater();
 	addDockAreasToList(NewDockAreas);
 	_this->dumpLayout();
 }
 
 
+//============================================================================
+void DockContainerWidgetPrivate::moveIntoCenterOfSection(QWidget* Widget, CDockAreaWidget* TargetArea)
+{
+	auto DroppedDockWidget = qobject_cast<CDockWidget*>(Widget);
+	auto DroppedArea = qobject_cast<CDockAreaWidget*>(Widget);
+
+	if (DroppedDockWidget)
+	{
+		CDockAreaWidget* OldDockArea = DroppedDockWidget->dockAreaWidget();
+		if (OldDockArea)
+		{
+			OldDockArea->removeDockWidget(DroppedDockWidget);
+		}
+		TargetArea->insertDockWidget(0, DroppedDockWidget, true);
+	}
+	else
+	{
+		QList<CDockWidget*> NewDockWidgets = DroppedArea->dockWidgets();
+		int NewCurrentIndex = DroppedArea->currentIndex();
+		for (int i = 0; i < NewDockWidgets.count(); ++i)
+		{
+			CDockWidget* DockWidget = NewDockWidgets[i];
+			TargetArea->insertDockWidget(i, DockWidget, false);
+		}
+		TargetArea->setCurrentIndex(NewCurrentIndex);
+		DroppedArea->dockContainer()->removeDockArea(DroppedArea);
+		DroppedArea->deleteLater();
+	}
+
+	TargetArea->updateTitleBarVisibility();
+	return;
+}
+
+
+//============================================================================
+void DockContainerWidgetPrivate::moveToNewSection(QWidget* Widget, CDockAreaWidget* TargetArea, DockWidgetArea area)
+{
+	// Dropping into center means all dock widgets in the dropped floating
+	// widget will become tabs of the drop area
+	if (CenterDockWidgetArea == area)
+	{
+		moveIntoCenterOfSection(Widget, TargetArea);
+		return;
+	}
+
+
+	CDockWidget* DroppedDockWidget = qobject_cast<CDockWidget*>(Widget);
+	CDockAreaWidget* DroppedDockArea = qobject_cast<CDockAreaWidget*>(Widget);
+	CDockAreaWidget* NewDockArea;
+	if (DroppedDockWidget)
+	{
+		NewDockArea = new CDockAreaWidget(DockManager, _this);
+		CDockAreaWidget* OldDockArea = DroppedDockWidget->dockAreaWidget();
+		if (OldDockArea)
+		{
+			OldDockArea->removeDockWidget(DroppedDockWidget);
+		}
+		NewDockArea->addDockWidget(DroppedDockWidget);
+	}
+	else
+	{
+		DroppedDockArea->dockContainer()->removeDockArea(DroppedDockArea);
+		NewDockArea = DroppedDockArea;
+	}
+
+	auto InsertParam = internal::dockAreaInsertParameters(area);
+	QSplitter* TargetAreaSplitter = internal::findParent<QSplitter*>(TargetArea);
+	int AreaIndex = TargetAreaSplitter->indexOf(TargetArea);
+	auto Sizes = TargetAreaSplitter->sizes();
+	if (TargetAreaSplitter->orientation() == InsertParam.orientation())
+	{
+		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
+		TargetAreaSplitter->insertWidget(AreaIndex + InsertParam.insertOffset(), NewDockArea);
+		int Size = (TargetAreaSize - TargetAreaSplitter->handleWidth()) / 2;
+		Sizes[AreaIndex] = Size;
+		Sizes.insert(AreaIndex, Size);
+	}
+	else
+	{
+		auto Sizes = TargetAreaSplitter->sizes();
+		int TargetAreaSize = (InsertParam.orientation() == Qt::Horizontal) ? TargetArea->width() : TargetArea->height();
+		QSplitter* NewSplitter = newSplitter(InsertParam.orientation());
+		NewSplitter->addWidget(TargetArea);
+		insertWidgetIntoSplitter(NewSplitter, NewDockArea, InsertParam.append());
+		int Size = TargetAreaSize / 2;
+		NewSplitter->setSizes({Size, Size});
+		TargetAreaSplitter->insertWidget(AreaIndex, NewSplitter);
+	}
+	TargetAreaSplitter->setSizes(Sizes);
+
+	addDockAreasToList({NewDockArea});
+}
+
+
+//============================================================================
+void DockContainerWidgetPrivate::moveToContainer(QWidget* Widget, DockWidgetArea area)
+{
+	CDockWidget* DroppedDockWidget = qobject_cast<CDockWidget*>(Widget);
+	CDockAreaWidget* DroppedDockArea = qobject_cast<CDockAreaWidget*>(Widget);
+	CDockAreaWidget* NewDockArea;
+
+	if (DroppedDockWidget)
+	{
+		NewDockArea = new CDockAreaWidget(DockManager, _this);
+		CDockAreaWidget* OldDockArea = DroppedDockWidget->dockAreaWidget();
+		if (OldDockArea)
+		{
+			OldDockArea->removeDockWidget(DroppedDockWidget);
+		}
+		NewDockArea->addDockWidget(DroppedDockWidget);
+	}
+	else
+	{
+		DroppedDockArea->dockContainer()->removeDockArea(DroppedDockArea);
+		NewDockArea = DroppedDockArea;
+	}
+
+	addDockArea(NewDockArea, area);
+	LastAddedAreaCache[areaIdToIndex(area)] = NewDockArea;
+}
+
+
 //============================================================================
 void DockContainerWidgetPrivate::addDockAreasToList(const QList<CDockAreaWidget*> NewDockAreas)
 {
@@ -555,7 +740,7 @@ void DockContainerWidgetPrivate::saveChildNodesState(QXmlStreamWriter& s, QWidge
 	if (Splitter)
 	{
 		s.writeStartElement("Splitter");
-		s.writeAttribute("Orientation", (Splitter->orientation() == Qt::Horizontal) ? "-" : "|");
+		s.writeAttribute("Orientation", (Splitter->orientation() == Qt::Horizontal) ? "|" : "-");
 		s.writeAttribute("Count", QString::number(Splitter->count()));
         ADS_PRINT("NodeSplitter orient: " << Splitter->orientation()
             << " WidgetCont: " << Splitter->count());
@@ -584,25 +769,30 @@ void DockContainerWidgetPrivate::saveChildNodesState(QXmlStreamWriter& s, QWidge
 
 
 //============================================================================
-bool DockContainerWidgetPrivate::restoreSplitter(QXmlStreamReader& s,
+bool DockContainerWidgetPrivate::restoreSplitter(CDockingStateReader& s,
 	QWidget*& CreatedWidget, bool Testing)
 {
 	bool Ok;
 	QString OrientationStr = s.attributes().value("Orientation").toString();
-	int Orientation;
-	if (OrientationStr.startsWith("-"))
-	{
-		Orientation = Qt::Horizontal;
-	}
-	else if (OrientationStr.startsWith("|"))
-	{
-		Orientation = Qt::Vertical;
-	}
-	else
+
+	// Check if the orientation string is right
+	if (!OrientationStr.startsWith("|") && !OrientationStr.startsWith("-"))
 	{
 		return false;
 	}
 
+	// The "|" shall indicate a vertical splitter handle which in turn means
+	// a Horizontal orientation of the splitter layout.
+	bool HorizontalSplitter = OrientationStr.startsWith("|");
+	// In version 0 we had a small bug. The "|" indicated a vertical orientation,
+	// but this is wrong, because only the splitter handle is vertical, the
+	// layout of the splitter is a horizontal layout. We fix this here
+	if (s.fileVersion() == 0)
+	{
+		HorizontalSplitter = !HorizontalSplitter;
+	}
+
+	int Orientation = HorizontalSplitter ? Qt::Horizontal : Qt::Vertical;
 	int WidgetCount = s.attributes().value("Count").toInt(&Ok);
 	if (!Ok)
 	{
@@ -691,7 +881,7 @@ bool DockContainerWidgetPrivate::restoreSplitter(QXmlStreamReader& s,
 
 
 //============================================================================
-bool DockContainerWidgetPrivate::restoreDockArea(QXmlStreamReader& s,
+bool DockContainerWidgetPrivate::restoreDockArea(CDockingStateReader& s,
 	QWidget*& CreatedWidget, bool Testing)
 {
 	bool Ok;
@@ -772,7 +962,7 @@ bool DockContainerWidgetPrivate::restoreDockArea(QXmlStreamReader& s,
 
 
 //============================================================================
-bool DockContainerWidgetPrivate::restoreChildNodes(QXmlStreamReader& s,
+bool DockContainerWidgetPrivate::restoreChildNodes(CDockingStateReader& s,
 	QWidget*& CreatedWidget, bool Testing)
 {
 	bool Result = true;
@@ -848,9 +1038,7 @@ void DockContainerWidgetPrivate::addDockArea(CDockAreaWidget* NewDockArea, DockW
 		RootSplitter = NewSplitter;
 	}
 
-	appendDockAreas({NewDockArea});
-	NewDockArea->updateTitleBarVisibility();
-	emitDockAreasAdded();
+	addDockAreasToList({NewDockArea});
 }
 
 
@@ -1194,11 +1382,12 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 	const QPoint& TargetPos)
 {
     ADS_PRINT("CDockContainerWidget::dropFloatingWidget");
+	CDockWidget* SingleDroppedDockWidget = FloatingWidget->topLevelDockWidget();
+	CDockWidget* SingleDockWidget = topLevelDockWidget();
 	CDockAreaWidget* DockArea = dockAreaAt(TargetPos);
 	auto dropArea = InvalidDockWidgetArea;
 	auto ContainerDropArea = d->DockManager->containerOverlay()->dropAreaUnderCursor();
-	CDockWidget* FloatingTopLevelDockWidget = FloatingWidget->topLevelDockWidget();
-	CDockWidget* TopLevelDockWidget = topLevelDockWidget();
+	bool Dropped = false;
 
 	if (DockArea)
 	{
@@ -1215,6 +1404,7 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 		{
             ADS_PRINT("Dock Area Drop Content: " << dropArea);
 			d->dropIntoSection(FloatingWidget, DockArea, dropArea);
+			Dropped = true;
 		}
 	}
 
@@ -1226,22 +1416,66 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 		if (dropArea != InvalidDockWidgetArea)
 		{
 			d->dropIntoContainer(FloatingWidget, dropArea);
+			Dropped = true;
+		}
+	}
+
+	if (Dropped)
+	{
+		FloatingWidget->deleteLater();
+
+		// If we dropped a floating widget with only one single dock widget, then we
+		// drop a top level widget that changes from floating to docked now
+		CDockWidget::emitTopLevelEventForWidget(SingleDroppedDockWidget, false);
+
+		// If there was a top level widget before the drop, then it is not top
+		// level widget anymore
+		CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
+	}
+}
+
+
+//============================================================================
+void CDockContainerWidget::dropWidget(QWidget* Widget, const QPoint& TargetPos)
+{
+    ADS_PRINT("CDockContainerWidget::dropFloatingWidget");
+    CDockWidget* SingleDockWidget = topLevelDockWidget();
+	CDockAreaWidget* DockArea = dockAreaAt(TargetPos);
+	auto dropArea = InvalidDockWidgetArea;
+	auto ContainerDropArea = d->DockManager->containerOverlay()->dropAreaUnderCursor();
+
+	if (DockArea)
+	{
+		auto dropOverlay = d->DockManager->dockAreaOverlay();
+		dropOverlay->setAllowedAreas(AllDockAreas);
+		dropArea = dropOverlay->showOverlay(DockArea);
+		if (ContainerDropArea != InvalidDockWidgetArea &&
+			ContainerDropArea != dropArea)
+		{
+			dropArea = InvalidDockWidgetArea;
+		}
+
+		if (dropArea != InvalidDockWidgetArea)
+		{
+            ADS_PRINT("Dock Area Drop Content: " << dropArea);
+            d->moveToNewSection(Widget, DockArea, dropArea);
+		}
+	}
+
+	// mouse is over container
+	if (InvalidDockWidgetArea == dropArea)
+	{
+		dropArea = ContainerDropArea;
+        ADS_PRINT("Container Drop Content: " << dropArea);
+		if (dropArea != InvalidDockWidgetArea)
+		{
+			d->moveToContainer(Widget, dropArea);
 		}
 	}
 
 	// If there was a top level widget before the drop, then it is not top
 	// level widget anymore
-	if (TopLevelDockWidget)
-	{
-		TopLevelDockWidget->emitTopLevelChanged(false);
-	}
-
-	// If we drop a floating widget with only one single dock widget, then we
-	// drop a top level widget that changes from floating to docked now
-	if (FloatingTopLevelDockWidget)
-	{
-		FloatingTopLevelDockWidget->emitTopLevelChanged(false);
-	}
+	CDockWidget::emitTopLevelEventForWidget(SingleDockWidget, false);
 }
 
 
@@ -1285,7 +1519,7 @@ void CDockContainerWidget::saveState(QXmlStreamWriter& s) const
 
 
 //============================================================================
-bool CDockContainerWidget::restoreState(QXmlStreamReader& s, bool Testing)
+bool CDockContainerWidget::restoreState(CDockingStateReader& s, bool Testing)
 {
 	bool IsFloating = s.attributes().value("Floating").toInt();
     ADS_PRINT("Restore CDockContainerWidget Floating" << IsFloating);
@@ -1306,7 +1540,7 @@ bool CDockContainerWidget::restoreState(QXmlStreamReader& s, bool Testing)
 			return false;
 		}
 
-		QByteArray GeometryString = s.readElementText(QXmlStreamReader::ErrorOnUnexpectedElement).toLocal8Bit();
+		QByteArray GeometryString = s.readElementText(CDockingStateReader::ErrorOnUnexpectedElement).toLocal8Bit();
 		QByteArray Geometry = QByteArray::fromHex(GeometryString);
 		if (Geometry.isEmpty())
 		{
@@ -1479,10 +1713,23 @@ void CDockContainerWidget::closeOtherAreas(CDockAreaWidget* KeepOpenArea)
 {
 	for (const auto DockArea : d->DockAreas)
 	{
-		if (DockArea != KeepOpenArea && DockArea->features().testFlag(CDockWidget::DockWidgetClosable))
+		if (DockArea == KeepOpenArea)
 		{
-			DockArea->closeArea();
+			continue;
 		}
+
+		if (!DockArea->features(BitwiseAnd).testFlag(CDockWidget::DockWidgetClosable))
+		{
+			continue;
+		}
+
+		// We do not close areas with widgets with custom close handling
+		if (DockArea->features(BitwiseOr).testFlag(CDockWidget::CustomCloseHandling))
+		{
+			continue;
+		}
+
+		DockArea->closeArea();
 	}
 }
 

src/DockContainerWidget.h

@@ -36,7 +36,7 @@
 #include "DockWidget.h"
 
 class QXmlStreamWriter;
-class QXmlStreamReader;
+
 
 namespace ads
 {
@@ -47,6 +47,9 @@ class CDockManager;
 struct DockManagerPrivate;
 class CFloatingDockContainer;
 struct FloatingDockContainerPrivate;
+class CFloatingDragPreview;
+struct FloatingDragPreviewPrivate;
+class CDockingStateReader;
 
 /**
  * Container that manages a number of dock areas with single dock widgets
@@ -68,6 +71,9 @@ private:
 	friend class CFloatingDockContainer;
 	friend struct FloatingDockContainerPrivate;
 	friend class CDockWidget;
+	friend class CFloatingDragPreview;
+	friend struct FloatingDragPreviewPrivate;
+
 protected:
 	/**
 	 * Handles activation events to update zOrderIndex
@@ -89,6 +95,11 @@ protected:
 	 */
 	void dropFloatingWidget(CFloatingDockContainer* FloatingWidget, const QPoint& TargetPos);
 
+	/**
+	 * Drop a dock area or a dock widget given in widget parameter
+	 */
+	void dropWidget(QWidget* Widget, const QPoint& TargetPos);
+
 	/**
 	 * Adds the given dock area to this container widget
 	 */
@@ -110,7 +121,7 @@ protected:
 	 * stream but does not restore anything. You can use this check for
 	 * faulty files before you start restoring the state
 	 */
-	bool restoreState(QXmlStreamReader& Stream, bool Testing);
+	bool restoreState(CDockingStateReader& Stream, bool Testing);
 
 	/**
 	 * This function returns the last added dock area widget for the given

src/DockManager.cpp

@@ -42,7 +42,6 @@
 #include <QFile>
 #include <QAction>
 #include <QXmlStreamWriter>
-#include <QXmlStreamReader>
 #include <QSettings>
 #include <QMenu>
 #include <QApplication>
@@ -52,6 +51,9 @@
 #include "DockWidget.h"
 #include "ads_globals.h"
 #include "DockAreaWidget.h"
+#include "IconProvider.h"
+#include "DockingStateReader.h"
+
 
 
 namespace ads
@@ -74,6 +76,7 @@ struct DockManagerPrivate
 	QMenu* ViewMenu;
 	CDockManager::eViewMenuInsertionOrder MenuInsertionOrder = CDockManager::MenuAlphabeticallySorted;
 	bool RestoringState = false;
+	QVector<CFloatingDockContainer*> UninitializedFloatingWidgets;
 
 	/**
 	 * Private data constructor
@@ -120,7 +123,7 @@ struct DockManagerPrivate
 	/**
 	 * Restores the container with the given index
 	 */
-	bool restoreContainer(int Index, QXmlStreamReader& stream, bool Testing);
+	bool restoreContainer(int Index, CDockingStateReader& stream, bool Testing);
 
 	/**
 	 * Loads the stylesheet
@@ -160,7 +163,7 @@ void DockManagerPrivate::loadStylesheet()
 
 
 //============================================================================
-bool DockManagerPrivate::restoreContainer(int Index, QXmlStreamReader& stream, bool Testing)
+bool DockManagerPrivate::restoreContainer(int Index, CDockingStateReader& stream, bool Testing)
 {
 	if (Testing)
 	{
@@ -202,11 +205,13 @@ bool DockManagerPrivate::checkFormat(const QByteArray &state, int version)
 bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int version,
 	bool Testing)
 {
+	Q_UNUSED(version);
+
     if (state.isEmpty())
     {
         return false;
     }
-    QXmlStreamReader s(state);
+    CDockingStateReader s(state);
     s.readNextStartElement();
     if (s.name() != "QtAdvancedDockingSystem")
     {
@@ -215,11 +220,12 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     ADS_PRINT(s.attributes().value("Version"));
     bool ok;
     int v = s.attributes().value("Version").toInt(&ok);
-    if (!ok || v != version)
+    if (!ok || v > CurrentVersion)
     {
     	return false;
     }
 
+    s.setFileVersion(v);
     bool Result = true;
 #ifdef ADS_DEBUG_PRINT
     int  DockContainers = s.attributes().value("Containers").toInt();
@@ -558,6 +564,48 @@ bool CDockManager::restoreState(const QByteArray &state, int version)
 }
 
 
+//============================================================================
+CFloatingDockContainer* CDockManager::addDockWidgetFloating(CDockWidget* Dockwidget)
+{
+	d->DockWidgetsMap.insert(Dockwidget->objectName(), Dockwidget);
+	CDockAreaWidget* OldDockArea = Dockwidget->dockAreaWidget();
+	if (OldDockArea)
+	{
+		OldDockArea->removeDockWidget(Dockwidget);
+	}
+
+	Dockwidget->setDockManager(this);
+	CFloatingDockContainer* FloatingWidget = new CFloatingDockContainer(Dockwidget);
+	FloatingWidget->resize(Dockwidget->size());
+	if (isVisible())
+	{
+		FloatingWidget->show();
+	}
+	else
+	{
+		d->UninitializedFloatingWidgets.append(FloatingWidget);
+	}
+	return FloatingWidget;
+}
+
+
+//============================================================================
+void CDockManager::showEvent(QShowEvent *event)
+{
+	Super::showEvent(event);
+	if (d->UninitializedFloatingWidgets.empty())
+	{
+		return;
+	}
+
+	for (auto FloatingWidget : d->UninitializedFloatingWidgets)
+	{
+		FloatingWidget->show();
+	}
+	d->UninitializedFloatingWidgets.clear();
+}
+
+
 //============================================================================
 CDockAreaWidget* CDockManager::addDockWidget(DockWidgetArea area,
 	CDockWidget* Dockwidget, CDockAreaWidget* DockAreaWidget)
@@ -604,8 +652,10 @@ CDockWidget* CDockManager::findDockWidget(const QString& ObjectName) const
 //============================================================================
 void CDockManager::removeDockWidget(CDockWidget* Dockwidget)
 {
+	emit dockWidgetAboutToBeRemoved(Dockwidget);
 	d->DockWidgetsMap.remove(Dockwidget->objectName());
 	CDockContainerWidget::removeDockWidget(Dockwidget);
+	emit dockWidgetRemoved(Dockwidget);
 }
 
 //============================================================================
@@ -788,6 +838,14 @@ void CDockManager::setConfigFlag(eConfigFlag Flag, bool On)
 }
 
 
+//===========================================================================
+CIconProvider& CDockManager::iconProvider()
+{
+	static CIconProvider Instance;
+	return Instance;
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockManager.h

@@ -30,10 +30,18 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
-#include "DockContainerWidget.h"
-#include <QIcon>
-
-#include "ads_globals.h"
+#include <ads_globals.h>
+#include <DockContainerWidget.h>
+#include <DockWidget.h>
+#include <FloatingDockContainer.h>
+#include <qbytearray.h>
+#include <qflags.h>
+#include <qlist.h>
+#include <qmap.h>
+#include <qobjectdefs.h>
+#include <qstring.h>
+#include <qstringlist.h>
+#include <QtGui/qicon.h>
 
 class QSettings;
 class QMenu;
@@ -44,11 +52,13 @@ struct DockManagerPrivate;
 class CFloatingDockContainer;
 struct FloatingDockContainerPrivate;
 class CDockContainerWidget;
+class DockContainerWidgetPrivate;
 class CDockOverlay;
 class CDockAreaTabBar;
 class CDockWidgetTab;
 struct DockWidgetTabPrivate;
 struct DockAreaWidgetPrivate;
+class CIconProvider;
 
 /**
  * The central dock manager that maintains the complete docking system.
@@ -71,10 +81,13 @@ private:
 	friend class CFloatingDockContainer;
 	friend struct FloatingDockContainerPrivate;
 	friend class CDockContainerWidget;
+	friend class DockContainerWidgetPrivate;
 	friend class CDockAreaTabBar;
 	friend class CDockWidgetTab;
 	friend struct DockAreaWidgetPrivate;
 	friend struct DockWidgetTabPrivate;
+	friend class CFloatingDragPreview;
+	friend struct FloatingDragPreviewPrivate;
 
 protected:
 	/**
@@ -110,7 +123,14 @@ protected:
 	 */
 	CDockOverlay* dockAreaOverlay() const;
 
+	/**
+	 * Show the floating widgets that has been created floating
+	 */
+	virtual void showEvent(QShowEvent *event) override;
+
 public:
+	using Super = CDockContainerWidget;
+
 	enum eViewMenuInsertionOrder
 	{
 		MenuSortedByInsertion,
@@ -132,7 +152,24 @@ public:
 		TabCloseButtonIsToolButton = 0x0040,//! If enabled the tab close buttons will be QToolButtons instead of QPushButtons - disabled by default
 		AllTabsHaveCloseButton = 0x0080, //!< if this flag is set, then all tabs that are closable show a close button
 		RetainTabSizeWhenCloseButtonHidden = 0x0100, //!< if this flag is set, the space for the close button is reserved even if the close button is not visible
-		DefaultConfig = ActiveTabHasCloseButton | DockAreaHasCloseButton | OpaqueSplitterResize | XmlCompressionEnabled, ///< the default configuration
+		OpaqueUndocking = 0x0200,///< If enabled, the widgets are immediately undocked into floating widgets, if disabled, only a draw preview is undocked and the real undocking is deferred until the mouse is released
+		DragPreviewIsDynamic = 0x0400,///< If opaque undocking is disabled, this flag defines the behavior of the drag preview window, if this flag is enabled, the preview will be adjusted dynamically to the drop area
+		DragPreviewShowsContentPixmap = 0x0800,///< If opaque undocking is disabled, the created drag preview window shows a copy of the content of the dock widget / dock are that is dragged
+		DragPreviewHasWindowFrame = 0x1000,///< If opaque undocking is disabled, then this flag configures if the drag preview is frameless or looks like a real window
+		DefaultConfig = ActiveTabHasCloseButton
+		              | DockAreaHasCloseButton
+		              | OpaqueSplitterResize
+		              | XmlCompressionEnabled
+		              | OpaqueUndocking, ///< the default configuration
+		DefaultNonOpaqueConfig = ActiveTabHasCloseButton
+		              | DockAreaHasCloseButton
+		              | XmlCompressionEnabled
+		              | DragPreviewShowsContentPixmap, ///< the default configuration for non opaque operations
+		NonOpaqueWithWindowFrame = ActiveTabHasCloseButton
+		              | DockAreaHasCloseButton
+		              | XmlCompressionEnabled
+		              | DragPreviewShowsContentPixmap
+		              | DragPreviewHasWindowFrame ///< the default configuration for non opaque operations that show a real window with frame
 	};
 	Q_DECLARE_FLAGS(ConfigFlags, eConfigFlag)
 
@@ -166,6 +203,13 @@ public:
 	 */
 	static void setConfigFlag(eConfigFlag Flag, bool On = true);
 
+	/**
+	 * Returns the global icon provider.
+	 * The icon provider enables the use of custom icons in case using
+	 * styleheets for icons is not an option.
+	 */
+	static CIconProvider& iconProvider();
+
 	/**
 	 * Adds dockwidget into the given area.
 	 * If DockAreaWidget is not null, then the area parameter indicates the area
@@ -198,6 +242,12 @@ public:
 	CDockAreaWidget* addDockWidgetTabToArea(CDockWidget* Dockwidget,
 		CDockAreaWidget* DockAreaWidget);
 
+	/**
+	 * Adds the given DockWidget floating and returns the created
+	 * CFloatingDockContainer instance.
+	 */
+	CFloatingDockContainer* addDockWidgetFloating(CDockWidget* Dockwidget);
+
 	/**
 	 * Searches for a registered doc widget with the given ObjectName
 	 * \return Return the found dock widget or nullptr if a dock widget with the
@@ -241,7 +291,7 @@ public:
 	 * The XmlMode XmlAutoFormattingDisabled is better if you would like to have
 	 * a more compact XML output - i.e. for storage in ini files.
 	 */
-	QByteArray saveState(int version = 0) const;
+	QByteArray saveState(int version = Version1) const;
 
 	/**
 	 * Restores the state of this dockmanagers dockwidgets.
@@ -250,7 +300,7 @@ public:
 	 * returns false; otherwise, the state is restored, and this function
 	 * returns true.
 	 */
-	bool restoreState(const QByteArray &state, int version = 0);
+	bool restoreState(const QByteArray &state, int version = Version1);
 
 	/**
 	 * Saves the current perspective to the internal list of perspectives.
@@ -383,6 +433,27 @@ signals:
      * perspective
      */
     void perspectiveOpened(const QString& PerspectiveName);
+
+    /**
+     * This signal is emitted, if a new DockArea has been created.
+     * An application can use this signal to set custom icons or custom
+     * tooltips for the DockArea buttons.
+     */
+    void dockAreaCreated(CDockAreaWidget* DockArea);
+
+    /**
+     * This signal is emitted just before the given dock widget is removed
+     * from the
+     */
+    void dockWidgetAboutToBeRemoved(CDockWidget* DockWidget);
+
+    /**
+     * This signal is emitted if a dock widget has been removed with the remove
+     * removeDockWidget() function.
+     * If this signal is emitted, the dock widget has been removed from the
+     * docking system but it is not deleted yet.
+     */
+    void dockWidgetRemoved(CDockWidget* DockWidget);
 }; // class DockManager
 } // namespace ads
 //-----------------------------------------------------------------------------

src/DockOverlay.cpp

@@ -52,7 +52,6 @@ struct DockOverlayPrivate
 	DockWidgetAreas AllowedAreas = InvalidDockWidgetArea;
 	CDockOverlayCross* Cross;
 	QPointer<QWidget> TargetWidget;
-	QRect TargetRect;
 	DockWidgetArea LastLocation = InvalidDockWidgetArea;
 	bool DropPreviewEnabled = true;
 	CDockOverlay::eMode Mode = CDockOverlay::ModeDockAreaOverlay;
@@ -333,7 +332,11 @@ CDockOverlay::CDockOverlay(QWidget* parent, eMode Mode) :
 {
 	d->Mode = Mode;
 	d->Cross = new CDockOverlayCross(this);
+#ifdef Q_OS_LINUX
+	setWindowFlags(Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
+#else
 	setWindowFlags(Qt::Tool | Qt::FramelessWindowHint);
+#endif
 	setWindowOpacity(1);
 	setWindowTitle("DockOverlay");
 	setAttribute(Qt::WA_NoSystemBackground);
@@ -408,7 +411,6 @@ DockWidgetArea CDockOverlay::showOverlay(QWidget* target)
 	}
 
 	d->TargetWidget = target;
-	d->TargetRect = QRect();
 	d->LastLocation = InvalidDockWidgetArea;
 
 	// Move it over the target.
@@ -427,8 +429,8 @@ void CDockOverlay::hideOverlay()
 {
 	hide();
 	d->TargetWidget.clear();
-	d->TargetRect = QRect();
 	d->LastLocation = InvalidDockWidgetArea;
+	d->DropAreaRect = QRect();
 }
 
 
@@ -440,6 +442,13 @@ void CDockOverlay::enableDropPreview(bool Enable)
 }
 
 
+//============================================================================
+bool CDockOverlay::dropPreviewEnabled() const
+{
+	return d->DropPreviewEnabled;
+}
+
+
 //============================================================================
 void CDockOverlay::paintEvent(QPaintEvent* event)
 {
@@ -568,7 +577,11 @@ CDockOverlayCross::CDockOverlayCross(CDockOverlay* overlay) :
 	d(new DockOverlayCrossPrivate(this))
 {
 	d->DockOverlay = overlay;
+#ifdef Q_OS_LINUX
+	setWindowFlags(Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
+#else
 	setWindowFlags(Qt::Tool | Qt::FramelessWindowHint);
+#endif
 	setWindowTitle("DockOverlayCross");
 	setAttribute(Qt::WA_TranslucentBackground);
 

src/DockOverlay.h

@@ -97,6 +97,11 @@ public:
 	 */
 	void enableDropPreview(bool Enable);
 
+	/**
+	 * Returns true if drop preview is enabled
+	 */
+	bool dropPreviewEnabled() const;
+
 	/**
 	 * The drop overlay rectangle for the target area
 	 */

src/DockWidget.cpp

@@ -31,6 +31,8 @@
 #include "DockWidgetTab.h"
 #include "DockWidget.h"
 
+#include <iostream>
+
 #include <QBoxLayout>
 #include <QAction>
 #include <QSplitter>
@@ -43,6 +45,10 @@
 #include <QToolBar>
 #include <QXmlStreamWriter>
 
+#include <QGuiApplication>
+#include <QScreen>
+#include <QWindow>
+
 #include "DockContainerWidget.h"
 #include "DockAreaWidget.h"
 #include "DockManager.h"
@@ -62,7 +68,7 @@ struct DockWidgetPrivate
 	QBoxLayout* Layout = nullptr;
 	QWidget* Widget = nullptr;
 	CDockWidgetTab* TabWidget = nullptr;
-	CDockWidget::DockWidgetFeatures Features = CDockWidget::AllDockWidgetFeatures;
+	CDockWidget::DockWidgetFeatures Features = CDockWidget::DefaultDockWidgetFeatures;
 	CDockManager* DockManager = nullptr;
 	CDockAreaWidget* DockArea = nullptr;
 	QAction* ToggleViewAction = nullptr;
@@ -128,8 +134,8 @@ void DockWidgetPrivate::showDockWidget()
 	}
 	else
 	{
-		DockArea->toggleView(true);
 		DockArea->setCurrentDockWidget(_this);
+		DockArea->toggleView(true);
 		TabWidget->show();
 		QSplitter* Splitter = internal::findParent<QSplitter*>(DockArea);
 		while (Splitter && !Splitter->isVisible())
@@ -294,6 +300,7 @@ void CDockWidget::setFeatures(DockWidgetFeatures features)
 		return;
 	}
 	d->Features = features;
+	emit featuresChanged(d->Features);
 	d->TabWidget->onDockWidgetFeaturesChanged();
 }
 
@@ -515,23 +522,39 @@ void CDockWidget::flagAsUnassigned()
 //============================================================================
 bool CDockWidget::event(QEvent *e)
 {
-	if (e->type() == QEvent::WindowTitleChange)
+	switch (e->type())
 	{
-		const auto title = windowTitle();
-		if (d->TabWidget)
+	case QEvent::Hide:
+		emit visibilityChanged(false);
+		break;
+
+	case QEvent::Show:
+		emit visibilityChanged(geometry().right() >= 0 && geometry().bottom() >= 0);
+        break;
+
+	case QEvent::WindowTitleChange :
 		{
-			d->TabWidget->setText(title);
+			const auto title = windowTitle();
+			if (d->TabWidget)
+			{
+				d->TabWidget->setText(title);
+			}
+			if (d->ToggleViewAction)
+			{
+				d->ToggleViewAction->setText(title);
+			}
+			if (d->DockArea)
+			{
+				d->DockArea->markTitleBarMenuOutdated();//update tabs menu
+			}
+			emit titleChanged(title);
 		}
-		if (d->ToggleViewAction)
-		{
-			d->ToggleViewAction->setText(title);
-		}
-		if (d->DockArea)
-		{
-			d->DockArea->markTitleBarMenuOutdated();//update tabs menu
-		}
-		emit titleChanged(title);
+		break;
+
+	default:
+		break;
 	}
+
 	return Super::event(e);
 }
 
@@ -726,6 +749,74 @@ QSize CDockWidget::minimumSizeHint() const
 }
 
 
+//============================================================================
+void CDockWidget::setFloating()
+{
+	if (isClosed())
+	{
+		return;
+	}
+	d->TabWidget->detachDockWidget();
+}
+
+
+//============================================================================
+void CDockWidget::deleteDockWidget()
+{
+	dockManager()->removeDockWidget(this);
+	deleteLater();
+	d->Closed = true;
+}
+
+
+//============================================================================
+void CDockWidget::closeDockWidget()
+{
+	closeDockWidgetInternal(true);
+}
+
+
+//============================================================================
+bool CDockWidget::closeDockWidgetInternal(bool ForceClose)
+{
+	if (!ForceClose)
+	{
+		emit closeRequested();
+	}
+
+	if (!ForceClose && features().testFlag(CDockWidget::CustomCloseHandling))
+	{
+		return false;
+	}
+
+	if (features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+    {
+		// If the dock widget is floating, then we check if we also need to
+		// delete the floating widget
+		if (isFloating())
+		{
+			CFloatingDockContainer* FloatingWidget = internal::findParent<
+					CFloatingDockContainer*>(this);
+			if (FloatingWidget->dockWidgets().count() == 1)
+			{
+				FloatingWidget->deleteLater();
+			}
+			else
+			{
+				FloatingWidget->hide();
+			}
+		}
+		deleteDockWidget();
+    }
+    else
+    {
+    	toggleView(false);
+    }
+
+	return true;
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockWidget.h

@@ -53,389 +53,434 @@ class CFloatingDockContainer;
  */
 class ADS_EXPORT CDockWidget : public QFrame
 {
-	Q_OBJECT
+    Q_OBJECT
 private:
-	DockWidgetPrivate* d; ///< private data (pimpl)
-	friend struct DockWidgetPrivate;
+    DockWidgetPrivate* d; ///< private data (pimpl)
+    friend struct DockWidgetPrivate;
 
 private slots:
-	/**
-	 * Adjusts the toolbar icon sizes according to the floating state
-	 */
-	void setToolbarFloatingStyle(bool topLevel);
+    /**
+     * Adjusts the toolbar icon sizes according to the floating state
+     */
+    void setToolbarFloatingStyle(bool topLevel);
 
 protected:
-	friend class CDockContainerWidget;
-	friend class CDockAreaWidget;
-	friend class CFloatingDockContainer;
-	friend class CDockManager;
-	friend struct DockManagerPrivate;
-	friend class DockContainerWidgetPrivate;
-	friend class CDockAreaTabBar;
-	friend class CDockWidgetTab;
-	friend struct DockWidgetTabPrivate;
+    friend class CDockContainerWidget;
+    friend class CDockAreaWidget;
+    friend class CFloatingDockContainer;
+    friend class CDockManager;
+    friend struct DockManagerPrivate;
+    friend class DockContainerWidgetPrivate;
+    friend class CDockAreaTabBar;
+    friend class CDockWidgetTab;
+    friend struct DockWidgetTabPrivate;
 
-	/**
-	 * Assigns the dock manager that manages this dock widget
-	 */
-	void setDockManager(CDockManager* DockManager);
+    /**
+     * Assigns the dock manager that manages this dock widget
+     */
+    void setDockManager(CDockManager* DockManager);
 
-	/**
-	 * If this dock widget is inserted into a dock area, the dock area will
-	 * be registered on this widget via this function. If a dock widget is
-	 * removed from a dock area, this function will be called with nullptr
-	 * value.
-	 */
-	void setDockArea(CDockAreaWidget* DockArea);
+    /**
+     * If this dock widget is inserted into a dock area, the dock area will
+     * be registered on this widget via this function. If a dock widget is
+     * removed from a dock area, this function will be called with nullptr
+     * value.
+     */
+    void setDockArea(CDockAreaWidget* DockArea);
 
-	/**
-	 * This function changes the toggle view action without emitting any
-	 * signal
-	 */
-	void setToggleViewActionChecked(bool Checked);
+    /**
+     * This function changes the toggle view action without emitting any
+     * signal
+     */
+    void setToggleViewActionChecked(bool Checked);
 
-	/**
-	 * Saves the state into the given stream
-	 */
-	void saveState(QXmlStreamWriter& Stream) const;
+    /**
+     * Saves the state into the given stream
+     */
+    void saveState(QXmlStreamWriter& Stream) const;
 
-	/**
-	 * This is a helper function for the dock manager to flag this widget
-	 * as unassigned.
-	 * When calling the restore function, it may happen, that the saved state
-	 * contains less dock widgets then currently available. All widgets whose
-	 * data is not contained in the saved state, are flagged as unassigned
-	 * after the restore process. If the user shows an unassigned dock widget,
-	 * a floating widget will be created to take up the dock widget.
-	 */
-	void flagAsUnassigned();
+    /**
+     * This is a helper function for the dock manager to flag this widget
+     * as unassigned.
+     * When calling the restore function, it may happen, that the saved state
+     * contains less dock widgets then currently available. All widgets whose
+     * data is not contained in the saved state, are flagged as unassigned
+     * after the restore process. If the user shows an unassigned dock widget,
+     * a floating widget will be created to take up the dock widget.
+     */
+    void flagAsUnassigned();
 
-	/**
-	 * Call this function to emit a topLevelChanged() signal and to update
-	 * the dock area tool bar visibility
-	 */
-	static void emitTopLevelEventForWidget(CDockWidget* TopLevelDockWidget, bool Floating);
+    /**
+     * Call this function to emit a topLevelChanged() signal and to update
+     * the dock area tool bar visibility
+     */
+    static void emitTopLevelEventForWidget(CDockWidget* TopLevelDockWidget, bool Floating);
 
-	/**
-	 * Use this function to emit a top level changed event.
-	 * Do never use emit topLevelChanged(). Always use this function because
-	 * it only emits a signal if the floating state has really changed
-	 */
-	void emitTopLevelChanged(bool Floating);
+    /**
+     * Use this function to emit a top level changed event.
+     * Do never use emit topLevelChanged(). Always use this function because
+     * it only emits a signal if the floating state has really changed
+     */
+    void emitTopLevelChanged(bool Floating);
 
-	/**
-	 * Internal function for modifying the closed state when restoring
-	 * a saved docking state
-	 */
-	void setClosedState(bool Closed);
+    /**
+     * Internal function for modifying the closed state when restoring
+     * a saved docking state
+     */
+    void setClosedState(bool Closed);
 
-	/**
-	 * Internal toggle view function that does not check if the widget
-	 * already is in the given state
-	 */
-	void toggleViewInternal(bool Open);
+    /**
+     * Internal toggle view function that does not check if the widget
+     * already is in the given state
+     */
+    void toggleViewInternal(bool Open);
+
+    /**
+     * Internal close dock widget implementation.
+     * The function returns true if the dock widget has been closed or hidden
+     */
+    bool closeDockWidgetInternal(bool ForceClose = false);
 
 public:
-	using Super = QFrame;
+    using Super = QFrame;
 
-	enum DockWidgetFeature
-	{
-		DockWidgetClosable = 0x01,
-		DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
-		DockWidgetFloatable = 0x04,
-		AllDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
-		NoDockWidgetFeatures = 0x00
-	};
-	Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
+    enum DockWidgetFeature
+    {
+        DockWidgetClosable = 0x01,
+        DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
+        DockWidgetFloatable = 0x04,
+        DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
+        CustomCloseHandling = 0x10,
+        DefaultDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
+        AllDockWidgetFeatures = DefaultDockWidgetFeatures | DockWidgetDeleteOnClose | CustomCloseHandling,
+        NoDockWidgetFeatures = 0x00
+    };
+    Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
 
-	enum eState
-	{
-		StateHidden,
-		StateDocked,
-		StateFloating
-	};
+    enum eState
+    {
+        StateHidden,
+        StateDocked,
+        StateFloating
+    };
 
-	/**
-	 * Sets the widget for the dock widget to widget.
-	 * The InsertMode defines how the widget is inserted into the dock widget.
-	 * The content of a dock widget should be resizable do a very small size to
-	 * prevent the dock widget from blocking the resizing. To ensure, that a
-	 * dock widget can be resized very well, it is better to insert the content+
-	 * widget into a scroll area or to provide a widget that is already a scroll
-	 * area or that contains a scroll area.
-	 * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
-	 * detect how to insert the given widget. If the widget is derived from
-	 * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
-	 * directly. If the given widget is not a scroll area, the widget will be
-	 * inserted into a scroll area.
-	 * To force insertion into a scroll area, you can also provide the InsertMode
-	 * ForceScrollArea. To prevent insertion into a scroll area, you can
-	 * provide the InsertMode ForceNoScrollArea
-	 */
-	enum eInsertMode
-	{
-		AutoScrollArea,
-		ForceScrollArea,
-		ForceNoScrollArea
-	};
+    /**
+     * Sets the widget for the dock widget to widget.
+     * The InsertMode defines how the widget is inserted into the dock widget.
+     * The content of a dock widget should be resizable do a very small size to
+     * prevent the dock widget from blocking the resizing. To ensure, that a
+     * dock widget can be resized very well, it is better to insert the content+
+     * widget into a scroll area or to provide a widget that is already a scroll
+     * area or that contains a scroll area.
+     * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
+     * detect how to insert the given widget. If the widget is derived from
+     * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
+     * directly. If the given widget is not a scroll area, the widget will be
+     * inserted into a scroll area.
+     * To force insertion into a scroll area, you can also provide the InsertMode
+     * ForceScrollArea. To prevent insertion into a scroll area, you can
+     * provide the InsertMode ForceNoScrollArea
+     */
+    enum eInsertMode
+    {
+        AutoScrollArea,
+        ForceScrollArea,
+        ForceNoScrollArea
+    };
 
-	/**
-	 * This mode configures the behavior of the toggle view action.
-	 * If the mode if ActionModeToggle, then the toggle view action is
-	 * a checkable action to show / hide the dock widget. If the mode
-	 * is ActionModeShow, then the action is not checkable an it will
-	 * always show the dock widget if clicked. If the mode is ActionModeShow,
-	 * the user can only close the DockWidget with the close button.
-	 */
-	enum eToggleViewActionMode
-	{
-		ActionModeToggle,//!< ActionModeToggle
-		ActionModeShow   //!< ActionModeShow
-	};
+    /**
+     * This mode configures the behavior of the toggle view action.
+     * If the mode if ActionModeToggle, then the toggle view action is
+     * a checkable action to show / hide the dock widget. If the mode
+     * is ActionModeShow, then the action is not checkable an it will
+     * always show the dock widget if clicked. If the mode is ActionModeShow,
+     * the user can only close the DockWidget with the close button.
+     */
+    enum eToggleViewActionMode
+    {
+        ActionModeToggle,//!< ActionModeToggle
+        ActionModeShow   //!< ActionModeShow
+    };
 
 
-	/**
-	 * This constructor creates a dock widget with the given title.
-	 * The title is the text that is shown in the window title when the dock
-	 * widget is floating and it is the title that is shown in the titlebar
-	 * or the tab of this dock widget if it is tabified.
-	 * The object name of the dock widget is also set to the title. The
-	 * object name is required by the dock manager to properly save and restore
-	 * the state of the dock widget. That means, the title needs to be unique.
-	 * If your title is not unique or if you would like to change the title
-	 * during runtime, you need to set a unique object name explicitely
-	 * by calling setObjectName() after construction.
-	 * Use the layoutFlags to configure the layout of the dock widget.
-	 */
-	CDockWidget(const QString &title, QWidget* parent = 0);
+    /**
+     * This constructor creates a dock widget with the given title.
+     * The title is the text that is shown in the window title when the dock
+     * widget is floating and it is the title that is shown in the titlebar
+     * or the tab of this dock widget if it is tabified.
+     * The object name of the dock widget is also set to the title. The
+     * object name is required by the dock manager to properly save and restore
+     * the state of the dock widget. That means, the title needs to be unique.
+     * If your title is not unique or if you would like to change the title
+     * during runtime, you need to set a unique object name explicitely
+     * by calling setObjectName() after construction.
+     * Use the layoutFlags to configure the layout of the dock widget.
+     */
+    CDockWidget(const QString &title, QWidget* parent = 0);
 
-	/**
-	 * Virtual Destructor
-	 */
-	virtual ~CDockWidget();
+    /**
+     * Virtual Destructor
+     */
+    virtual ~CDockWidget();
 
-	/**
-	 * We return a fixed minimum size hint for all dock widgets
-	 */
-	virtual QSize minimumSizeHint() const override;
+    /**
+     * We return a fixed minimum size hint for all dock widgets
+     */
+    virtual QSize minimumSizeHint() const override;
 
-	/**
-	 * Sets the widget for the dock widget to widget.
-	 * The InsertMode defines how the widget is inserted into the dock widget.
-	 * The content of a dock widget should be resizable do a very small size to
-	 * prevent the dock widget from blocking the resizing. To ensure, that a
-	 * dock widget can be resized very well, it is better to insert the content+
-	 * widget into a scroll area or to provide a widget that is already a scroll
-	 * area or that contains a scroll area.
-	 * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
-	 * detect how to insert the given widget. If the widget is derived from
-	 * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
-	 * directly. If the given widget is not a scroll area, the widget will be
-	 * inserted into a scroll area.
-	 * To force insertion into a scroll area, you can also provide the InsertMode
-	 * ForceScrollArea. To prevent insertion into a scroll area, you can
-	 * provide the InsertMode ForceNoScrollArea
-	 */
-	void setWidget(QWidget* widget, eInsertMode InsertMode = AutoScrollArea);
+    /**
+     * Sets the widget for the dock widget to widget.
+     * The InsertMode defines how the widget is inserted into the dock widget.
+     * The content of a dock widget should be resizable do a very small size to
+     * prevent the dock widget from blocking the resizing. To ensure, that a
+     * dock widget can be resized very well, it is better to insert the content+
+     * widget into a scroll area or to provide a widget that is already a scroll
+     * area or that contains a scroll area.
+     * If the InsertMode is AutoScrollArea, the DockWidget tries to automatically
+     * detect how to insert the given widget. If the widget is derived from
+     * QScrollArea (i.e. an QAbstractItemView), then the widget is inserted
+     * directly. If the given widget is not a scroll area, the widget will be
+     * inserted into a scroll area.
+     * To force insertion into a scroll area, you can also provide the InsertMode
+     * ForceScrollArea. To prevent insertion into a scroll area, you can
+     * provide the InsertMode ForceNoScrollArea
+     */
+    void setWidget(QWidget* widget, eInsertMode InsertMode = AutoScrollArea);
 
-	/**
-	 * Remove the widget from the dock and give ownership back to the caller
-	 */
-	QWidget* takeWidget();
+    /**
+     * Remove the widget from the dock and give ownership back to the caller
+     */
+    QWidget* takeWidget();
 
-	/**
-	 * Returns the widget for the dock widget. This function returns zero if
-	 * the widget has not been set.
-	 */
-	QWidget* widget() const;
+    /**
+     * Returns the widget for the dock widget. This function returns zero if
+     * the widget has not been set.
+     */
+    QWidget* widget() const;
 
-	/**
-	 * Returns the title bar widget of this dock widget
-	 */
-	CDockWidgetTab* tabWidget() const;
+    /**
+     * Returns the tab widget of this dock widget that is shown in the dock
+     * area title bar
+     */
+    CDockWidgetTab* tabWidget() const;
 
-	/**
-	 * Sets, whether the dock widget is movable, closable, and floatable.
-	 */
-	void setFeatures(DockWidgetFeatures features);
+    /**
+     * Sets, whether the dock widget is movable, closable, and floatable.
+     */
+    void setFeatures(DockWidgetFeatures features);
 
-	/**
-	 * Sets the feature flag for this dock widget if on is true; otherwise
-	 * clears the flag.
-	 */
-	void setFeature(DockWidgetFeature flag, bool on);
+    /**
+     * Sets the feature flag for this dock widget if on is true; otherwise
+     * clears the flag.
+     */
+    void setFeature(DockWidgetFeature flag, bool on);
 
-	/**
-	 * This property holds whether the dock widget is movable, closable, and
-	 * floatable.
-	 * By default, this property is set to a combination of DockWidgetClosable,
-	 * DockWidgetMovable and DockWidgetFloatable.
-	 */
-	DockWidgetFeatures features() const;
+    /**
+     * This property holds whether the dock widget is movable, closable, and
+     * floatable.
+     * By default, this property is set to a combination of DockWidgetClosable,
+     * DockWidgetMovable and DockWidgetFloatable.
+     */
+    DockWidgetFeatures features() const;
 
-	/**
-	 * Returns the dock manager that manages the dock widget or 0 if the widget
-	 * has not been assigned to any dock manager yet
-	 */
-	CDockManager* dockManager() const;
+    /**
+     * Returns the dock manager that manages the dock widget or 0 if the widget
+     * has not been assigned to any dock manager yet
+     */
+    CDockManager* dockManager() const;
 
-	/**
-	 * Returns the dock container widget this dock area widget belongs to or 0
-	 * if this dock widget has not been docked yet
-	 */
-	CDockContainerWidget* dockContainer() const;
+    /**
+     * Returns the dock container widget this dock area widget belongs to or 0
+     * if this dock widget has not been docked yet
+     */
+    CDockContainerWidget* dockContainer() const;
 
-	/**
-	 * Returns the dock area widget this dock widget belongs to or 0
-	 * if this dock widget has not been docked yet
-	 */
-	CDockAreaWidget* dockAreaWidget() const;
+    /**
+     * Returns the dock area widget this dock widget belongs to or 0
+     * if this dock widget has not been docked yet
+     */
+    CDockAreaWidget* dockAreaWidget() const;
 
-	/**
-	 * This property holds whether the dock widget is floating.
-	 * A dock widget is only floating, if it is the one and only widget inside
-	 * of a floating container. If there are more than one dock widget in a
-	 * floating container, the all dock widgets are docked and not floating.
-	 */
-	bool isFloating() const;
+    /**
+     * This property holds whether the dock widget is floating.
+     * A dock widget is only floating, if it is the one and only widget inside
+     * of a floating container. If there are more than one dock widget in a
+     * floating container, the all dock widgets are docked and not floating.
+     */
+    bool isFloating() const;
 
-	/**
-	 * This function returns true, if this dock widget is in a floating.
-	 * The function returns true, if the dock widget is floating and it also
-	 * returns true if it is docked inside of a floating container.
-	 */
-	bool isInFloatingContainer() const;
+    /**
+     * This function returns true, if this dock widget is in a floating.
+     * The function returns true, if the dock widget is floating and it also
+     * returns true if it is docked inside of a floating container.
+     */
+    bool isInFloatingContainer() const;
 
-	/**
-	 * Returns true, if this dock widget is closed.
-	 */
-	bool isClosed() const;
+    /**
+     * Returns true, if this dock widget is closed.
+     */
+    bool isClosed() const;
 
-	/**
-	 * Returns a checkable action that can be used to show or close this dock widget.
-	 * The action's text is set to the dock widget's window title.
-	 */
-	QAction* toggleViewAction() const;
+    /**
+     * Returns a checkable action that can be used to show or close this dock widget.
+     * The action's text is set to the dock widget's window title.
+     */
+    QAction* toggleViewAction() const;
 
-	/**
-	 * Configures the behavior of the toggle view action.
-	 * \see eToggleViewActionMode for a detailed description
-	 */
-	void setToggleViewActionMode(eToggleViewActionMode Mode);
+    /**
+     * Configures the behavior of the toggle view action.
+     * \see eToggleViewActionMode for a detailed description
+     */
+    void setToggleViewActionMode(eToggleViewActionMode Mode);
 
-	/**
-	 * Sets the dock widget icon that is shown in tabs and in toggle view
-	 * actions
-	 */
-	void setIcon(const QIcon& Icon);
+    /**
+     * Sets the dock widget icon that is shown in tabs and in toggle view
+     * actions
+     */
+    void setIcon(const QIcon& Icon);
 
-	/**
-	 * Returns the icon that has been assigned to the dock widget
-	 */
-	QIcon icon() const;
+    /**
+     * Returns the icon that has been assigned to the dock widget
+     */
+    QIcon icon() const;
 
-	/**
-	 * If the WithToolBar layout flag is enabled, then this function returns
-	 * the dock widget toolbar. If the flag is disabled, the function returns
-	 * a nullptr.
-	 * This function returns the dock widget top tool bar.
-	 * If no toolbar is assigned, this function returns nullptr. To get a vaild
-	 * toolbar you either need to create a default empty toolbar via
-	 * createDefaultToolBar() function or you need to assign you custom
-	 * toolbar via setToolBar().
-	 */
-	QToolBar* toolBar() const;
+    /**
+     * If the WithToolBar layout flag is enabled, then this function returns
+     * the dock widget toolbar. If the flag is disabled, the function returns
+     * a nullptr.
+     * This function returns the dock widget top tool bar.
+     * If no toolbar is assigned, this function returns nullptr. To get a vaild
+     * toolbar you either need to create a default empty toolbar via
+     * createDefaultToolBar() function or you need to assign you custom
+     * toolbar via setToolBar().
+     */
+    QToolBar* toolBar() const;
 
-	/**
-	 * If you would like to use the default top tool bar, then call this
-	 * function to create the default tool bar.
-	 * After this function the toolBar() function will return a valid toolBar()
-	 * object.
-	 */
-	QToolBar* createDefaultToolBar();
+    /**
+     * If you would like to use the default top tool bar, then call this
+     * function to create the default tool bar.
+     * After this function the toolBar() function will return a valid toolBar()
+     * object.
+     */
+    QToolBar* createDefaultToolBar();
 
-	/**
-	 * Assign a new tool bar that is shown above the content widget.
-	 * The dock widget will become the owner of the tool bar and deletes it
-	 * on destruction
-	 */
-	void setToolBar(QToolBar* ToolBar);
+    /**
+     * Assign a new tool bar that is shown above the content widget.
+     * The dock widget will become the owner of the tool bar and deletes it
+     * on destruction
+     */
+    void setToolBar(QToolBar* ToolBar);
 
-	/**
-	 * This function sets the tool button style for the given dock widget state.
-	 * It is possible to switch the tool button style depending on the state.
-	 * If a dock widget is floating, then here are more space and it is
-	 * possible to select a style that requires more space like
-	 * Qt::ToolButtonTextUnderIcon. For the docked state Qt::ToolButtonIconOnly
-	 * might be better.
-	 */
-	void setToolBarStyle(Qt::ToolButtonStyle Style, eState State);
+    /**
+     * This function sets the tool button style for the given dock widget state.
+     * It is possible to switch the tool button style depending on the state.
+     * If a dock widget is floating, then here are more space and it is
+     * possible to select a style that requires more space like
+     * Qt::ToolButtonTextUnderIcon. For the docked state Qt::ToolButtonIconOnly
+     * might be better.
+     */
+    void setToolBarStyle(Qt::ToolButtonStyle Style, eState State);
 
-	/**
-	 * Returns the tool button style for the given docking state.
-	 * \see setToolBarStyle()
-	 */
-	Qt::ToolButtonStyle toolBarStyle(eState State) const;
+    /**
+     * Returns the tool button style for the given docking state.
+     * \see setToolBarStyle()
+     */
+    Qt::ToolButtonStyle toolBarStyle(eState State) const;
 
-	/**
-	 * This function sets the tool button icon size for the given state.
-	 * If a dock widget is floating, there is more space an increasing the
-	 * icon size is possible. For docked widgets, small icon sizes, eg. 16 x 16
-	 * might be better.
-	 */
-	void setToolBarIconSize(const QSize& IconSize, eState State);
+    /**
+     * This function sets the tool button icon size for the given state.
+     * If a dock widget is floating, there is more space an increasing the
+     * icon size is possible. For docked widgets, small icon sizes, eg. 16 x 16
+     * might be better.
+     */
+    void setToolBarIconSize(const QSize& IconSize, eState State);
 
-	/**
-	 * Returns the icon size for a given docking state.
-	 * \see setToolBarIconSize()
-	 */
-	QSize toolBarIconSize(eState State) const;
+    /**
+     * Returns the icon size for a given docking state.
+     * \see setToolBarIconSize()
+     */
+    QSize toolBarIconSize(eState State) const;
 
 
-	#ifndef QT_NO_TOOLTIP
-	/**
-	 * This is function sets text tooltip for title bar widget 
-	 * and tooltip for toggle view action
-	 */
-	void setTabToolTip(const QString &text);
-	#endif
+#ifndef QT_NO_TOOLTIP
+    /**
+     * This is function sets text tooltip for title bar widget
+     * and tooltip for toggle view action
+     */
+    void setTabToolTip(const QString &text);
+#endif
 
 public: // reimplements QFrame -----------------------------------------------
-	/**
-	 * Emits titleChanged signal if title change event occurs
-	 */
-	virtual bool event(QEvent *e) override;
+    /**
+     * Emits titleChanged signal if title change event occurs
+     */
+    virtual bool event(QEvent *e) override;
 
 public slots:
-	/**
-	 * This property controls whether the dock widget is open or closed.
-	 * The toogleViewAction triggers this slot
-	 */
-	void toggleView(bool Open = true);
+    /**
+     * This property controls whether the dock widget is open or closed.
+     * The toogleViewAction triggers this slot
+     */
+    void toggleView(bool Open = true);
+
+    /**
+     * This function will make a docked widget floating
+     */
+    void setFloating();
+
+    /**
+     * This function will delete the dock widget and its content from the
+     * docking system
+     */
+    void deleteDockWidget();
+
+    /**
+     * Closes the dock widget
+     */
+    void closeDockWidget();
+
 
 signals:
-	/**
-	 * This signal is emitted if the dock widget is opened or closed
-	 */
-	void viewToggled(bool Open);
+    /**
+     * This signal is emitted if the dock widget is opened or closed
+     */
+    void viewToggled(bool Open);
 
-	/**
-	 * This signal is emitted if the dock widget is closed
-	 */
-	void closed();
+    /**
+     * This signal is emitted if the dock widget is closed
+     */
+    void closed();
 
-	/**
-	 * This signal is emitted if the window title of this dock widget
-	 * changed
-	 */
-	void titleChanged(const QString& Title);
+    /**
+     * This signal is emitted if the window title of this dock widget
+     * changed
+     */
+    void titleChanged(const QString& Title);
 
-	/**
-	 * This signal is emitted when the floating property changes.
-	 * The topLevel parameter is true if the dock widget is now floating;
-	 * otherwise it is false.
-	 */
-	void topLevelChanged(bool topLevel);
+    /**
+     * This signal is emitted when the floating property changes.
+     * The topLevel parameter is true if the dock widget is now floating;
+     * otherwise it is false.
+     */
+    void topLevelChanged(bool topLevel);
+
+    /**
+     * This signal is emitted, if close is requested
+     */
+    void closeRequested();
+
+    /**
+     * This signal is emitted when the dock widget becomes visible (or invisible).
+     * This happens when the widget is hidden or shown, as well as when it is
+     * docked in a tabbed dock area and its tab becomes selected or unselected.
+     */
+    void visibilityChanged(bool visible);
+
+    /**
+     * This signal is emitted when the features property changes.
+     * The features parameter gives the new value of the property.
+     */
+    void featuresChanged(DockWidgetFeatures features);
 }; // class DockWidget
 }
  // namespace ads

src/DockWidgetTab.cpp

@@ -28,6 +28,7 @@
 //============================================================================
 //                                   INCLUDES
 //============================================================================
+#include <FloatingDragPreview.h>
 #include "ElidingLabel.h"
 #include "DockWidgetTab.h"
 
@@ -48,6 +49,7 @@
 #include "FloatingDockContainer.h"
 #include "DockOverlay.h"
 #include "DockManager.h"
+#include "IconProvider.h"
 
 #include <iostream>
 
@@ -65,14 +67,15 @@ struct DockWidgetTabPrivate
 	CDockWidget* DockWidget;
 	QLabel* IconLabel = nullptr;
 	tTabLabel* TitleLabel;
-	QPoint DragStartMousePosition;
+	QPoint GlobalDragStartMousePosition;
 	bool IsActiveTab = false;
 	CDockAreaWidget* DockArea = nullptr;
 	eDragState DragState = DraggingInactive;
-	CFloatingDockContainer* FloatingWidget = nullptr;
+	IFloatingWidget* FloatingWidget = nullptr;
 	QIcon Icon;
 	QAbstractButton* CloseButton = nullptr;
 	QSpacerItem* IconTextSpacer;
+	QPoint TabDragStartPosition;
 
 	/**
 	 * Private data constructor
@@ -92,7 +95,7 @@ struct DockWidgetTabPrivate
 	/**
 	 * Test function for current drag state
 	 */
-	bool isDraggingState(eDragState dragState)
+	bool isDraggingState(eDragState dragState) const
 	{
 		return this->DragState == dragState;
 	}
@@ -138,6 +141,24 @@ struct DockWidgetTabPrivate
 			return new QPushButton();
 		}
 	}
+
+	template <typename T>
+	IFloatingWidget* createFloatingWidget(T* Widget, bool OpaqueUndocking)
+	{
+		if (OpaqueUndocking)
+		{
+			return new CFloatingDockContainer(Widget);
+		}
+		else
+		{
+			auto w = new CFloatingDragPreview(Widget);
+			_this->connect(w, &CFloatingDragPreview::draggingCanceled, [=]()
+			{
+				DragState = DraggingInactive;
+			});
+			return w;
+		}
+	}
 };
 // struct DockWidgetTabPrivate
 
@@ -161,11 +182,14 @@ void DockWidgetTabPrivate::createLayout()
 
 	CloseButton = createCloseButton();
 	CloseButton->setObjectName("tabCloseButton");
-	// The standard icons do does not look good on high DPI screens
-	QIcon CloseIcon;
-	QPixmap normalPixmap = _this->style()->standardPixmap(QStyle::SP_TitleBarCloseButton, 0, CloseButton);
-	CloseIcon.addPixmap(normalPixmap, QIcon::Normal);
-	CloseIcon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
+	QIcon CloseIcon = CDockManager::iconProvider().customIcon(TabCloseIcon);
+	if (CloseIcon.isNull())
+	{
+		// The standard icons do does not look good on high DPI screens
+		QPixmap normalPixmap = _this->style()->standardPixmap(QStyle::SP_TitleBarCloseButton, 0, CloseButton);
+		CloseIcon.addPixmap(normalPixmap, QIcon::Normal);
+		CloseIcon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
+	}
 	CloseButton->setIcon(CloseIcon);
     CloseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
     _this->onDockWidgetFeaturesChanged();
@@ -195,11 +219,10 @@ void DockWidgetTabPrivate::createLayout()
 void DockWidgetTabPrivate::moveTab(QMouseEvent* ev)
 {
     ev->accept();
-    int left, top, right, bottom;
-    _this->getContentsMargins(&left, &top, &right, &bottom);
-    QPoint moveToPos = _this->mapToParent(ev->pos()) - DragStartMousePosition;
-    moveToPos.setY(0);
-    _this->move(moveToPos);
+    QPoint Distance = ev->globalPos() - GlobalDragStartMousePosition;
+    Distance.setY(0);
+    auto TargetPos = Distance + TabDragStartPosition;
+    _this->move(TargetPos);
     _this->raise();
 }
 
@@ -223,32 +246,36 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
 
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
+	auto DragStartMousePosition = _this->mapFromGlobal(GlobalDragStartMousePosition);
 	QSize Size = DockArea->size();
-	CFloatingDockContainer* FloatingWidget = nullptr;
+	IFloatingWidget* FloatingWidget = nullptr;
+	bool OpaqueUndocking = CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking) ||
+		(DraggingFloatingWidget != DraggingState);
+
+	// If section widget has multiple tabs, we take only one tab
+	// If it has only one single tab, we can move the complete
+	// dock area into floating widget
 	if (DockArea->dockWidgetsCount() > 1)
 	{
-		// If section widget has multiple tabs, we take only one tab
-		FloatingWidget = new CFloatingDockContainer(DockWidget);
+		FloatingWidget = createFloatingWidget(DockWidget, OpaqueUndocking);
 	}
 	else
 	{
-		// If section widget has only one content widget, we can move the complete
-		// dock area into floating widget
-		FloatingWidget = new CFloatingDockContainer(DockArea);
+		FloatingWidget = createFloatingWidget(DockArea, OpaqueUndocking);
 	}
 
     if (DraggingFloatingWidget == DraggingState)
     {
-        FloatingWidget->startDragging(DragStartMousePosition, Size, _this);
+        FloatingWidget->startFloating(DragStartMousePosition, Size, DraggingFloatingWidget, _this);
     	auto Overlay = DockWidget->dockManager()->containerOverlay();
     	Overlay->setAllowedAreas(OuterDockAreas);
     	this->FloatingWidget = FloatingWidget;
     }
     else
     {
-     	FloatingWidget->initFloatingGeometry(DragStartMousePosition, Size);
+     	FloatingWidget->startFloating(DragStartMousePosition, Size, DraggingInactive, nullptr);
     }
-    DockWidget->emitTopLevelChanged(true);
+
 	return true;
 }
 
@@ -277,7 +304,7 @@ void CDockWidgetTab::mousePressEvent(QMouseEvent* ev)
 	if (ev->button() == Qt::LeftButton)
 	{
 		ev->accept();
-        d->DragStartMousePosition = ev->pos();
+        d->GlobalDragStartMousePosition = ev->globalPos();
         d->DragState = DraggingMousePressed;
         emit clicked();
 		return;
@@ -290,14 +317,30 @@ void CDockWidgetTab::mousePressEvent(QMouseEvent* ev)
 //============================================================================
 void CDockWidgetTab::mouseReleaseEvent(QMouseEvent* ev)
 {
-	// End of tab moving, emit signal
-	if (d->isDraggingState(DraggingTab) && d->DockArea)
+	if (ev->button() == Qt::LeftButton)
 	{
-		emit moved(ev->globalPos());
+		auto CurrentDragState = d->DragState;
+		d->GlobalDragStartMousePosition = QPoint();
+		d->DragState = DraggingInactive;
+
+		switch (CurrentDragState)
+		{
+		case DraggingTab:
+			// End of tab moving, emit signal
+			if (d->DockArea)
+			{
+				emit moved(ev->globalPos());
+			}
+			break;
+
+		case DraggingFloatingWidget:
+			 d->FloatingWidget->finishDragging();
+			 break;
+
+		default:; // do nothing
+		}
 	}
 
-    d->DragStartMousePosition = QPoint();
-    d->DragState = DraggingInactive;
 	Super::mouseReleaseEvent(ev);
 }
 
@@ -329,7 +372,7 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     }
 
     // Maybe a fixed drag distance is better here ?
-    int DragDistanceY = qAbs(d->DragStartMousePosition.y() - ev->pos().y());
+    int DragDistanceY = qAbs(d->GlobalDragStartMousePosition.y() - ev->globalPos().y());
     if (DragDistanceY >= CDockManager::startDragDistance())
 	{
 		// If this is the last dock area in a dock container with only
@@ -345,13 +388,25 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     	// Floating is only allowed for widgets that are movable
         if (d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
         {
+        	// If we undock, we need to restore the initial position of this
+        	// tab because it looks strange if it remains on its dragged position
+        	if (d->isDraggingState(DraggingTab) && !CDockManager::configFlags().testFlag(CDockManager::OpaqueUndocking))
+			{
+				this->move(d->TabDragStartPosition);
+			}
             d->startFloating();
         }
     	return;
 	}
     else if (d->DockArea->openDockWidgetsCount() > 1
-     && (ev->pos() - d->DragStartMousePosition).manhattanLength() >= QApplication::startDragDistance()) // Wait a few pixels before start moving
+     && (ev->globalPos() - d->GlobalDragStartMousePosition).manhattanLength() >= QApplication::startDragDistance()) // Wait a few pixels before start moving
 	{
+    	// If we start dragging the tab, we save its inital position to
+    	// restore it later
+    	if (DraggingTab != d->DragState)
+    	{
+    		d->TabDragStartPosition = this->pos();
+    	}
         d->DragState = DraggingTab;
 		return;
 	}
@@ -364,16 +419,20 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
 void CDockWidgetTab::contextMenuEvent(QContextMenuEvent* ev)
 {
 	ev->accept();
+	if (d->isDraggingState(DraggingFloatingWidget))
+	{
+		return;
+	}
 
-	d->DragStartMousePosition = ev->pos();
+	d->GlobalDragStartMousePosition = ev->globalPos();
 	QMenu Menu(this);
-	auto Action = Menu.addAction(tr("Detach"), this, SLOT(onDetachActionTriggered()));
+	auto Action = Menu.addAction(tr("Detach"), this, SLOT(detachDockWidget()));
 	Action->setEnabled(d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable));
 	Menu.addSeparator();
 	Action = Menu.addAction(tr("Close"), this, SIGNAL(closeRequested()));
 	Action->setEnabled(isClosable());
 	Menu.addAction(tr("Close Others"), this, SIGNAL(closeOtherTabsRequested()));
-	Menu.exec(mapToGlobal(ev->pos()));
+	Menu.exec(ev->globalPos());
 }
 
 
@@ -490,7 +549,7 @@ void CDockWidgetTab::mouseDoubleClickEvent(QMouseEvent *event)
 	if ((!d->DockArea->dockContainer()->isFloating() || d->DockArea->dockWidgetsCount() > 1)
 		&& d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{
-		d->DragStartMousePosition = event->pos();
+		d->GlobalDragStartMousePosition = event->globalPos();
 		d->startFloating(DraggingInactive);
 	}
 
@@ -522,13 +581,13 @@ bool CDockWidgetTab::isClosable() const
 
 
 //===========================================================================
-void CDockWidgetTab::onDetachActionTriggered()
+void CDockWidgetTab::detachDockWidget()
 {
 	if (!d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{
 		return;
 	}
-	d->DragStartMousePosition = mapFromGlobal(QCursor::pos());
+	d->GlobalDragStartMousePosition = QCursor::pos();
 	d->startFloating(DraggingInactive);
 }
 
@@ -536,13 +595,13 @@ void CDockWidgetTab::onDetachActionTriggered()
 //============================================================================
 bool CDockWidgetTab::event(QEvent *e)
 {
-	#ifndef QT_NO_TOOLTIP
+#ifndef QT_NO_TOOLTIP
 	if (e->type() == QEvent::ToolTipChange)
 	{
 		const auto text = toolTip();
 		d->TitleLabel->setToolTip(text);
 	}
-	#endif
+#endif
 	return Super::event(e);
 }
 

src/DockWidgetTab.h

@@ -57,7 +57,7 @@ private:
 	void onDockWidgetFeaturesChanged();
 
 private slots:
-	void onDetachActionTriggered();
+	void detachDockWidget();
 
 protected:
 	virtual void mousePressEvent(QMouseEvent* ev) override;
@@ -133,7 +133,7 @@ public:
 	void setText(const QString& title);
 
 	/**
-	 * This function returns true if the assigned dock widget is closeable
+	 * This function returns true if the assigned dock widget is closable
 	 */
 	bool isClosable() const;
 

src/DockingStateReader.cpp

@@ -0,0 +1,30 @@
+//============================================================================
+/// \file   DockingStateReader.cpp
+/// \author Uwe Kindler
+/// \date   29.11.2019
+/// \brief  Implementation of CDockingStateReader
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "DockingStateReader.h"
+
+namespace ads
+{
+
+//============================================================================
+void CDockingStateReader::setFileVersion(int FileVersion)
+{
+	m_FileVersion = FileVersion;
+}
+
+//============================================================================
+int CDockingStateReader::fileVersion() const
+{
+	return m_FileVersion;
+}
+} // namespace ads
+
+//---------------------------------------------------------------------------
+// EOF DockingStateReader.cpp

src/DockingStateReader.h

@@ -0,0 +1,43 @@
+#ifndef DockingStateReaderH
+#define DockingStateReaderH
+//============================================================================
+/// \file   DockingStateReader.h
+/// \author Uwe Kindler
+/// \date   29.11.2019
+/// \brief  Declaration of CDockingStateReader
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QXmlStreamReader>
+
+namespace ads
+{
+
+/**
+ * Extends QXmlStreamReader with file version information
+ */
+class CDockingStateReader : public QXmlStreamReader
+{
+private:
+	int m_FileVersion;
+
+public:
+	using QXmlStreamReader::QXmlStreamReader;
+
+	/**
+	 * Set the file version for this state reader
+	 */
+	void setFileVersion(int FileVersion);
+
+	/**
+	 * Returns the file version set via setFileVersion
+	 */
+	int fileVersion() const;
+};
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+#endif // DockingStateReaderH

src/FloatingDockContainer.cpp

@@ -28,6 +28,8 @@
 //============================================================================
 #include "FloatingDockContainer.h"
 
+#include <iostream>
+
 #include <QBoxLayout>
 #include <QApplication>
 #include <QMouseEvent>
@@ -260,11 +262,6 @@ CFloatingDockContainer::CFloatingDockContainer(CDockManager *DockManager) :
 #endif
 
 	DockManager->registerFloatingWidget(this);
-
-	// We install an event filter to detect mouse release events because we
-	// do not receive mouse release event if the floating widget is behind
-	// the drop overlay cross
-	qApp->installEventFilter(this);
 }
 
 //============================================================================
@@ -275,6 +272,11 @@ CFloatingDockContainer::CFloatingDockContainer(CDockAreaWidget *DockArea) :
 #ifdef Q_OS_LINUX
     d->TitleBar->enableCloseButton(isClosable());
 #endif
+    auto TopLevelDockWidget = topLevelDockWidget();
+    if (TopLevelDockWidget)
+    {
+    	TopLevelDockWidget->emitTopLevelChanged(true);
+    }
 }
 
 //============================================================================
@@ -285,6 +287,11 @@ CFloatingDockContainer::CFloatingDockContainer(CDockWidget *DockWidget) :
 #ifdef Q_OS_LINUX
     d->TitleBar->enableCloseButton(isClosable());
 #endif
+    auto TopLevelDockWidget = topLevelDockWidget();
+    if (TopLevelDockWidget)
+    {
+    	TopLevelDockWidget->emitTopLevelChanged(true);
+    }
 }
 
 //============================================================================
@@ -329,6 +336,13 @@ void CFloatingDockContainer::moveEvent(QMoveEvent *event)
 
 	case DraggingFloatingWidget:
 		d->updateDropOverlays(QCursor::pos());
+#ifdef Q_OS_MACOS
+		// In OSX when hiding the DockAreaOverlay the application would set
+		// the main window as the active window for some reason. This fixes
+		// that by resetting the active window to the floating widget after
+		// updating the overlays.
+		QApplication::setActiveWindow(this);
+#endif
 		break;
 	default:
 		break;
@@ -340,9 +354,19 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 {
 	ADS_PRINT("CFloatingDockContainer closeEvent");
 	d->setState(DraggingInactive);
+	event->ignore();
 
 	if (isClosable())
 	{
+		auto TopLevelDockWidget = topLevelDockWidget();
+		if (TopLevelDockWidget && TopLevelDockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+		{
+			if (!TopLevelDockWidget->closeDockWidgetInternal())
+			{
+				return;
+			}
+		}
+
 		// In Qt version after 5.9.2 there seems to be a bug that causes the
 		// QWidget::event() function to not receive any NonClientArea mouse
 		// events anymore after a close/show cycle. The bug is reported here:
@@ -352,20 +376,7 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 		// Starting from Qt version 5.12.2 this seems to work again. But
 		// now the QEvent::NonClientAreaMouseButtonPress function returns always
 		// Qt::RightButton even if the left button was pressed
-#ifndef Q_OS_LINUX
-#if (QT_VERSION > QT_VERSION_CHECK(5, 9, 2) && QT_VERSION < QT_VERSION_CHECK(5, 12, 2))
-        event->ignore();
         this->hide();
-#else
-		Super::closeEvent(event);
-#endif
-#else // Q_OS_LINUX
-        Super::closeEvent(event);
-#endif
-	}
-	else
-	{
-		event->ignore();
 	}
 }
 
@@ -373,6 +384,11 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 void CFloatingDockContainer::hideEvent(QHideEvent *event)
 {
 	Super::hideEvent(event);
+    if (event->spontaneous())
+    {
+        return;
+    }
+
     // Prevent toogleView() events during restore state
     if (d->DockManager->isRestoringState())
     {
@@ -471,20 +487,6 @@ bool CFloatingDockContainer::event(QEvent *e)
 	return QWidget::event(e);
 }
 
-//============================================================================
-bool CFloatingDockContainer::eventFilter(QObject *watched, QEvent *event)
-{
-	Q_UNUSED(watched);
-	if (event->type() == QEvent::MouseButtonRelease
-	    && d->isState(DraggingFloatingWidget))
-	{
-		ADS_PRINT("FloatingWidget::eventFilter QEvent::MouseButtonRelease");
-		finishDragging();
-		d->titleMouseReleaseEvent();
-	}
-
-	return false;
-}
 
 //============================================================================
 void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
@@ -497,17 +499,9 @@ void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
 	d->setState(DragState);
 	d->DragStartMousePosition = DragStartMousePos;
 #ifdef Q_OS_LINUX
-	// I have not found a way on Linux to display the floating widget behind the
-	// dock overlay. That means if the user drags this floating widget around,
-	// it is always painted in front of the dock overlay and dock overlay cross.
-	// and the user will not see the dock overlay. To work around this issue,
-	// the window opacity is set to 0.6 to make the dock overlay visible
-	// again. If someone has an idea, how to place the dragged floating widget
-	// behind the dock overlay, then a pull request would be welcome.
 	if (DraggingFloatingWidget == DragState)
 	{
-		setAttribute(Qt::WA_X11NetWmWindowTypeDock, true);
-		setWindowOpacity(0.6);
+        setAttribute(Qt::WA_X11NetWmWindowTypeDock, true);
 		d->MouseEventHandler = MouseEventHandler;
 		if (d->MouseEventHandler)
 		{
@@ -517,7 +511,6 @@ void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
 #endif
 	moveFloating();
 	show();
-
 }
 
 //============================================================================
@@ -583,7 +576,7 @@ void CFloatingDockContainer::onDockAreaCurrentChanged(int Index)
 }
 
 //============================================================================
-bool CFloatingDockContainer::restoreState(QXmlStreamReader &Stream,
+bool CFloatingDockContainer::restoreState(CDockingStateReader &Stream,
     bool Testing)
 {
 	if (!d->DockContainer->restoreState(Stream, Testing))
@@ -627,6 +620,7 @@ void CFloatingDockContainer::finishDragging()
        d->MouseEventHandler = nullptr;
    }
 #endif
+   d->titleMouseReleaseEvent();
 }
 
 } // namespace ads

src/FloatingDockContainer.h

@@ -31,6 +31,8 @@
 //============================================================================
 #include "ads_globals.h"
 
+#include <QRubberBand>
+
 #ifdef Q_OS_LINUX
 #include <QDockWidget>
 #define tFloatingWidgetBase QDockWidget
@@ -39,7 +41,7 @@
 #define tFloatingWidgetBase QWidget
 #endif
 
-class QXmlStreamReader;
+class CDockingStateReader;
 
 namespace ads
 {
@@ -56,6 +58,40 @@ struct DockWidgetTabPrivate;
 class CDockAreaTitleBar;
 struct DockAreaTitleBarPrivate;
 class CFloatingWidgetTitleBar;
+class CDockingStateReader;
+
+/**
+ * Pure virtual interface for floating widgets.
+ * This interface is used for opaque and non-opaque undocking. If opaque
+ * undocking is used, the a real CFloatingDockContainer widget will be created
+ */
+class IFloatingWidget
+{
+public:
+	/**
+	 * Starts floating.
+	 * This function should get called typically from a mouse press event
+	 * handler
+	 */
+	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+        eDragState DragState, QWidget* MouseEventHandler) = 0;
+
+	/**
+	 * Moves the widget to a new position relative to the position given when
+	 * startFloating() was called.
+	 * This function should be called from a mouse mouve event handler to
+	 * move the floating widget on mouse move events.
+	 */
+	virtual void moveFloating() = 0;
+
+	/**
+	 * Tells the widget that to finish dragging if the mouse is released.
+	 * This function should be called from a mouse release event handler
+	 * to finish the dragging
+	 */
+	virtual void finishDragging() = 0;
+};
+
 
 /**
  * This implements a floating widget that is a dock container that accepts
@@ -63,7 +99,7 @@ class CFloatingWidgetTitleBar;
  * another dock container.
  * Every floating window of the docking system is a FloatingDockContainer.
  */
-class ADS_EXPORT CFloatingDockContainer : public tFloatingWidgetBase
+class ADS_EXPORT CFloatingDockContainer : public tFloatingWidgetBase, public IFloatingWidget
 {
 	Q_OBJECT
 private:
@@ -90,8 +126,8 @@ protected:
 	 * Use moveToGlobalPos() to move the widget to a new position
 	 * depending on the start position given in Pos parameter
 	 */
-	void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
-        eDragState DragState, QWidget* MouseEventHandler);
+	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+        eDragState DragState, QWidget* MouseEventHandler) override;
 
 	/**
 	 * Call this function to start dragging the floating widget
@@ -103,10 +139,10 @@ protected:
 	}
 
 	/**
-	 * Call this function if you explecitely want to signal that dragging has
+	 * Call this function if you explicitly want to signal that dragging has
 	 * finished
 	 */
-	void finishDragging();
+	virtual void finishDragging() override;
 
 	/**
 	 * Call this function if you just want to initialize the position
@@ -129,7 +165,7 @@ protected:
 	 * stream but does not restore anything. You can use this check for
 	 * faulty files before you start restoring the state
 	 */
-	bool restoreState(QXmlStreamReader& Stream, bool Testing);
+	bool restoreState(CDockingStateReader& Stream, bool Testing);
 
 	/**
 	 * Call this function to update the window title
@@ -144,13 +180,12 @@ protected: // reimplements QWidget
 	virtual void closeEvent(QCloseEvent *event) override;
 	virtual void hideEvent(QHideEvent *event) override;
 	virtual void showEvent(QShowEvent *event) override;
-	virtual bool eventFilter(QObject *watched, QEvent *event) override;
 
 public:
 	using Super = QWidget;
 
 	/**
-	 * Create empty flatingb widget - required for restore state
+	 * Create empty floating widget - required for restore state
 	 */
 	CFloatingDockContainer(CDockManager* DockManager);
 

src/FloatingDragPreview.cpp

@@ -0,0 +1,405 @@
+//============================================================================
+/// \file   FloatingDragPreview.cpp
+/// \author Uwe Kindler
+/// \date   26.11.2019
+/// \brief  Implementation of CFloatingDragPreview
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "FloatingDragPreview.h"
+#include <iostream>
+
+#include <QEvent>
+#include <QApplication>
+#include <QPainter>
+#include <QKeyEvent>
+
+#include "DockWidget.h"
+#include "DockAreaWidget.h"
+#include "DockManager.h"
+#include "DockContainerWidget.h"
+#include "DockOverlay.h"
+
+namespace ads
+{
+
+/**
+ * Private data class (pimpl)
+ */
+struct FloatingDragPreviewPrivate
+{
+	CFloatingDragPreview *_this;
+	QWidget* Content;
+	CDockAreaWidget* ContentSourceArea = nullptr;
+	CDockContainerWidget* ContenSourceContainer = nullptr;
+	QPoint DragStartMousePosition;
+	CDockManager* DockManager;
+	CDockContainerWidget *DropContainer = nullptr;
+	qreal WindowOpacity;
+	bool Hidden = false;
+	QPixmap ContentPreviewPixmap;
+
+
+	/**
+	 * Private data constructor
+	 */
+	FloatingDragPreviewPrivate(CFloatingDragPreview *_public);
+	void updateDropOverlays(const QPoint &GlobalPos);
+
+	void setHidden(bool Value)
+	{
+		Hidden = Value;
+		_this->update();
+	}
+
+	/**
+	 * Cancel dragging and emit the draggingCanceled event
+	 */
+	void cancelDragging()
+	{
+		emit _this->draggingCanceled();
+		DockManager->containerOverlay()->hideOverlay();
+		DockManager->dockAreaOverlay()->hideOverlay();
+		_this->close();
+	}
+};
+// struct LedArrayPanelPrivate
+
+
+//============================================================================
+void FloatingDragPreviewPrivate::updateDropOverlays(const QPoint &GlobalPos)
+{
+	if (!_this->isVisible() || !DockManager)
+	{
+		return;
+	}
+
+	auto Containers = DockManager->dockContainers();
+	CDockContainerWidget *TopContainer = nullptr;
+	for (auto ContainerWidget : Containers)
+	{
+		if (!ContainerWidget->isVisible())
+		{
+			continue;
+		}
+
+		/*if (DockContainer == ContainerWidget)
+		{
+			continue;
+		}*/
+
+		QPoint MappedPos = ContainerWidget->mapFromGlobal(GlobalPos);
+		if (ContainerWidget->rect().contains(MappedPos))
+		{
+			if (!TopContainer || ContainerWidget->isInFrontOf(TopContainer))
+			{
+				TopContainer = ContainerWidget;
+			}
+		}
+	}
+
+	DropContainer = TopContainer;
+	auto ContainerOverlay = DockManager->containerOverlay();
+	auto DockAreaOverlay = DockManager->dockAreaOverlay();
+	auto DockDropArea = DockAreaOverlay->dropAreaUnderCursor();
+	auto ContainerDropArea = ContainerOverlay->dropAreaUnderCursor();
+
+	if (!TopContainer)
+	{
+		ContainerOverlay->hideOverlay();
+		DockAreaOverlay->hideOverlay();
+		if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewIsDynamic))
+		{
+			setHidden(false);
+		}
+		return;
+	}
+
+	int VisibleDockAreas = TopContainer->visibleDockAreaCount();
+	ContainerOverlay->setAllowedAreas(
+	    VisibleDockAreas > 1 ? OuterDockAreas : AllDockAreas);
+	DockWidgetArea ContainerArea = ContainerOverlay->showOverlay(TopContainer);
+	ContainerOverlay->enableDropPreview(ContainerArea != InvalidDockWidgetArea);
+	auto DockArea = TopContainer->dockAreaAt(GlobalPos);
+	if (DockArea && DockArea->isVisible() && VisibleDockAreas > 0 && DockArea != ContentSourceArea)
+	{
+		DockAreaOverlay->enableDropPreview(true);
+		DockAreaOverlay->setAllowedAreas(
+		    (VisibleDockAreas == 1) ? NoDockWidgetArea : AllDockAreas);
+		DockWidgetArea Area = DockAreaOverlay->showOverlay(DockArea);
+
+		// A CenterDockWidgetArea for the dockAreaOverlay() indicates that
+		// the mouse is in the title bar. If the ContainerArea is valid
+		// then we ignore the dock area of the dockAreaOverlay() and disable
+		// the drop preview
+		if ((Area == CenterDockWidgetArea)
+		    && (ContainerArea != InvalidDockWidgetArea))
+		{
+			DockAreaOverlay->enableDropPreview(false);
+			ContainerOverlay->enableDropPreview(true);
+		}
+		else
+		{
+			ContainerOverlay->enableDropPreview(InvalidDockWidgetArea == Area);
+		}
+	}
+	else
+	{
+		DockAreaOverlay->hideOverlay();
+		if (DockArea == ContentSourceArea && InvalidDockWidgetArea == ContainerDropArea)
+		{
+			DropContainer = nullptr;
+		}
+	}
+
+	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewIsDynamic))
+	{
+		setHidden(DockDropArea != InvalidDockWidgetArea || ContainerDropArea != InvalidDockWidgetArea);
+	}
+}
+
+
+//============================================================================
+FloatingDragPreviewPrivate::FloatingDragPreviewPrivate(CFloatingDragPreview *_public) :
+	_this(_public)
+{
+
+}
+
+//============================================================================
+CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
+	QWidget(parent),
+	d(new FloatingDragPreviewPrivate(this))
+{
+	d->Content = Content;
+	setAttribute(Qt::WA_DeleteOnClose);
+	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+	{
+		setWindowFlags(
+			Qt::Window | Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);
+	}
+	else
+	{
+		setWindowFlags(Qt::Tool | Qt::FramelessWindowHint);
+		setAttribute(Qt::WA_NoSystemBackground);
+		setAttribute(Qt::WA_TranslucentBackground);
+	}
+
+#ifdef Q_OS_LINUX
+    auto Flags = windowFlags();
+    Flags |= Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint;
+    setWindowFlags(Flags);
+#endif
+
+	setWindowOpacity(0.6);
+
+	// Create a static image of the widget that should get undocked
+	// This is like some kind preview image like it is uses in drag and drop
+	// operations
+	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewShowsContentPixmap))
+	{
+		d->ContentPreviewPixmap = QPixmap(Content->size());
+		Content->render(&d->ContentPreviewPixmap);
+	}
+
+	connect(qApp, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
+		SLOT(onApplicationStateChanged(Qt::ApplicationState)));
+
+#ifdef Q_OS_LINUX
+    // In Windows this widget directly receives the escape key press events
+    // in Linux we need to install an event filter for the given Content
+    // widget to receive the escape key press
+    Content->installEventFilter(this);
+#endif
+}
+
+
+//============================================================================
+CFloatingDragPreview::CFloatingDragPreview(CDockWidget* Content)
+	: CFloatingDragPreview((QWidget*)Content, Content->dockManager())
+{
+	d->DockManager = Content->dockManager();
+	if (Content->dockAreaWidget()->openDockWidgetsCount() == 1)
+	{
+		d->ContentSourceArea = Content->dockAreaWidget();
+		d->ContenSourceContainer = Content->dockContainer();
+	}
+	setWindowTitle(Content->windowTitle());
+}
+
+
+//============================================================================
+CFloatingDragPreview::CFloatingDragPreview(CDockAreaWidget* Content)
+	: CFloatingDragPreview((QWidget*)Content, Content->dockManager())
+{
+	d->DockManager = Content->dockManager();
+	d->ContentSourceArea = Content;
+	d->ContenSourceContainer = Content->dockContainer();
+	setWindowTitle(Content->currentDockWidget()->windowTitle());
+}
+
+
+//============================================================================
+CFloatingDragPreview::~CFloatingDragPreview()
+{
+	delete d;
+}
+
+
+//============================================================================
+void CFloatingDragPreview::moveFloating()
+{
+	int BorderSize = (frameSize().width() - size().width()) / 2;
+	const QPoint moveToPos = QCursor::pos() - d->DragStartMousePosition
+	    - QPoint(BorderSize, 0);
+	move(moveToPos);
+}
+
+
+//============================================================================
+void CFloatingDragPreview::startFloating(const QPoint &DragStartMousePos,
+    const QSize &Size, eDragState DragState, QWidget *MouseEventHandler)
+{
+	Q_UNUSED(MouseEventHandler)
+	Q_UNUSED(DragState)
+	resize(Size);
+	d->DragStartMousePosition = DragStartMousePos;
+	moveFloating();
+	show();
+
+}
+
+
+//============================================================================
+void CFloatingDragPreview::moveEvent(QMoveEvent *event)
+{
+	QWidget::moveEvent(event);
+	d->updateDropOverlays(QCursor::pos());
+}
+
+
+//============================================================================
+void CFloatingDragPreview::finishDragging()
+{
+	ADS_PRINT("CFloatingDragPreview::finishDragging");
+	auto DockDropArea = d->DockManager->dockAreaOverlay()->dropAreaUnderCursor();
+	auto ContainerDropArea = d->DockManager->containerOverlay()->dropAreaUnderCursor();
+	bool DropPossible = (DockDropArea != InvalidDockWidgetArea) || (ContainerDropArea != InvalidDockWidgetArea);
+	if (d->DropContainer && DropPossible)
+	{
+		d->DropContainer->dropWidget(d->Content, QCursor::pos());
+	}
+	else
+	{
+		CDockWidget* DockWidget = qobject_cast<CDockWidget*>(d->Content);
+		CFloatingDockContainer* FloatingWidget;
+		if (DockWidget)
+		{
+			FloatingWidget = new CFloatingDockContainer(DockWidget);
+		}
+		else
+		{
+			CDockAreaWidget* DockArea = qobject_cast<CDockAreaWidget*>(d->Content);
+			FloatingWidget = new CFloatingDockContainer(DockArea);
+		}
+		FloatingWidget->setGeometry(this->geometry());
+		FloatingWidget->show();
+		if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+		{
+			QApplication::processEvents();
+			int FrameHeight = FloatingWidget->frameGeometry().height() - FloatingWidget->geometry().height();
+			QRect FixedGeometry = this->geometry();
+			FixedGeometry.adjust(0, FrameHeight, 0, 0);
+			FloatingWidget->setGeometry(FixedGeometry);
+		}
+	}
+
+	this->close();
+	d->DockManager->containerOverlay()->hideOverlay();
+	d->DockManager->dockAreaOverlay()->hideOverlay();
+}
+
+
+//============================================================================
+void CFloatingDragPreview::paintEvent(QPaintEvent* event)
+{
+	Q_UNUSED(event);
+	if (d->Hidden)
+	{
+		return;
+	}
+
+	QPainter painter(this);
+	if (CDockManager::configFlags().testFlag(CDockManager::DragPreviewShowsContentPixmap))
+	{
+		painter.drawPixmap(QPoint(0, 0), d->ContentPreviewPixmap);
+	}
+
+	// If we do not have a window frame then we paint a QRubberBand like
+	// frameless window
+	if (!CDockManager::configFlags().testFlag(CDockManager::DragPreviewHasWindowFrame))
+	{
+		QColor Color = palette().color(QPalette::Active, QPalette::Highlight);
+		QPen Pen = painter.pen();
+		Pen.setColor(Color.darker(120));
+		Pen.setStyle(Qt::SolidLine);
+		Pen.setWidth(1);
+		Pen.setCosmetic(true);
+		painter.setPen(Pen);
+		Color = Color.lighter(130);
+		Color.setAlpha(64);
+		painter.setBrush(Color);
+		painter.drawRect(rect().adjusted(0, 0, -1, -1));
+	}
+}
+
+
+//============================================================================
+void CFloatingDragPreview::keyPressEvent(QKeyEvent *event)
+{
+	Super::keyPressEvent(event);
+	if (event->key() == Qt::Key_Escape)
+	{
+		d->cancelDragging();
+	}
+}
+
+
+//============================================================================
+void CFloatingDragPreview::onApplicationStateChanged(Qt::ApplicationState state)
+{
+	if (state != Qt::ApplicationActive)
+	{
+		disconnect(qApp, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
+			this, SLOT(onApplicationStateChanged(Qt::ApplicationState)));
+		d->cancelDragging();
+	}
+}
+
+
+//============================================================================
+bool CFloatingDragPreview::eventFilter(QObject *watched, QEvent *event)
+{
+	Q_UNUSED(watched);
+    if (event->type() == QEvent::KeyPress)
+    {
+        QKeyEvent* e = static_cast<QKeyEvent*>(event);
+        if (e->key() == Qt::Key_Escape)
+        {
+            d->Content->removeEventFilter(this);
+            d->cancelDragging();
+        }
+    }
+
+    return false;
+}
+
+
+
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+// EOF FloatingDragPreview.cpp

src/FloatingDragPreview.h

@@ -0,0 +1,118 @@
+#ifndef FloatingDragPreviewH
+#define FloatingDragPreviewH
+//============================================================================
+/// \file   FloatingDragPreview.h
+/// \author Uwe Kindler
+/// \date   26.11.2019
+/// \brief  Declaration of CFloatingDragPreview
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QWidget>
+#include "FloatingDockContainer.h"
+
+namespace ads
+{
+class CDockWidget;
+class CDockAreaWidget;
+struct FloatingDragPreviewPrivate;
+
+/**
+ * A floating overlay is a temporary floating widget that is just used to
+ * indicate the floating widget movement.
+ * This widget is used as a placeholder for drag operations for non-opaque
+ * docking
+ */
+class CFloatingDragPreview : public QWidget, public IFloatingWidget
+{
+	Q_OBJECT
+private:
+	FloatingDragPreviewPrivate* d;
+	friend struct FloatingDragPreviewPrivate;
+
+private slots:
+	/**
+	 * Cancel non opaque undocking if application becomes inactive
+	 */
+	void onApplicationStateChanged(Qt::ApplicationState state);
+
+protected:
+	/**
+	 * Updates the drop overlays
+	 */
+	virtual void moveEvent(QMoveEvent *event) override;
+
+	/**
+	 * Cares about painting the
+	 */
+	virtual void paintEvent(QPaintEvent *e) override;
+
+	/**
+	 * Cancel non opaque undocking with escape key
+	 */
+	virtual void keyPressEvent(QKeyEvent *event) override;
+
+	/**
+	 * The content is a DockArea or a DockWidget
+	 */
+	CFloatingDragPreview(QWidget* Content, QWidget* parent);
+
+public:
+	using Super = QWidget;
+
+	/**
+	 * Creates an instance for undocking the DockWidget in Content parameter
+	 */
+	CFloatingDragPreview(CDockWidget* Content);
+
+	/**
+	 * Creates an instance for undocking the DockArea given in Content
+	 * parameters
+	 */
+	CFloatingDragPreview(CDockAreaWidget* Content);
+
+	/**
+	 * Delete private data
+	 */
+	~CFloatingDragPreview();
+
+    /**
+     * We filter the events of the assigned content widget to receive
+     * escape key presses for canceling the drag operation
+     */
+    virtual bool eventFilter(QObject *watched, QEvent *event) override;
+
+
+public: // implements IFloatingWidget -----------------------------------------
+	virtual void startFloating(const QPoint& DragStartMousePos, const QSize& Size,
+        eDragState DragState, QWidget* MouseEventHandler) override;
+
+	/**
+	 * Moves the widget to a new position relative to the position given when
+	 * startFloating() was called
+	 */
+	virtual void moveFloating() override;
+
+	/**
+	 * Finishes dragging.
+	 * Hides the dock overlays and executes the real undocking and docking
+	 * of the assigned Content widget
+	 */
+	virtual void finishDragging() override;
+
+signals:
+	/**
+	 * This signal is emitted, if dragging has been canceled by escape key
+	 * or by active application switching via task manager
+	 */
+	void draggingCanceled();
+};
+
+
+} // namespace ads
+
+//---------------------------------------------------------------------------
+#endif // FloatingDragPreviewH
+

src/IconProvider.cpp

@@ -0,0 +1,73 @@
+//============================================================================
+/// \file   IconProvider.cpp
+/// \author Uwe Kindler
+/// \date   18.10.2019
+/// \brief  Implementation of CIconProvider
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include "IconProvider.h"
+#include <QVector>
+
+namespace ads
+{
+/**
+ * Private data class (pimpl)
+ */
+struct IconProviderPrivate
+{
+	CIconProvider *_this;
+	QVector<QIcon> UserIcons{IconCount, QIcon()};
+
+	/**
+	 * Private data constructor
+	 */
+	IconProviderPrivate(CIconProvider *_public);
+};
+// struct LedArrayPanelPrivate
+
+//============================================================================
+IconProviderPrivate::IconProviderPrivate(CIconProvider *_public) :
+	_this(_public)
+{
+
+}
+
+//============================================================================
+CIconProvider::CIconProvider() :
+	d(new IconProviderPrivate(this))
+{
+
+}
+
+//============================================================================
+CIconProvider::~CIconProvider()
+{
+	delete d;
+}
+
+
+//============================================================================
+QIcon CIconProvider::customIcon(eIcon IconId) const
+{
+	Q_ASSERT(IconId < d->UserIcons.size());
+	return d->UserIcons[IconId];
+}
+
+
+//============================================================================
+void CIconProvider::registerCustomIcon(eIcon IconId, const QIcon &icon)
+{
+	Q_ASSERT(IconId < d->UserIcons.size());
+	d->UserIcons[IconId] = icon;
+}
+
+} // namespace ads
+
+
+
+
+//---------------------------------------------------------------------------
+// EOF IconProvider.cpp

src/IconProvider.h

@@ -0,0 +1,61 @@
+#ifndef IconProviderH
+#define IconProviderH
+//============================================================================
+/// \file   IconProvider.h
+/// \author Uwe Kindler
+/// \date   18.10.2019
+/// \brief  Declaration of CIconProvider
+//============================================================================
+
+//============================================================================
+//                                   INCLUDES
+//============================================================================
+#include <QIcon>
+
+#include "ads_globals.h"
+
+namespace ads
+{
+
+struct IconProviderPrivate;
+
+/**
+ * This object provides all icons that are required by the advanced docking
+ * system.
+ * The IconProvider enables the user to register custom icons in case using
+ * stylesheets is not an option.
+ */
+class ADS_EXPORT CIconProvider
+{
+private:
+	IconProviderPrivate* d; ///< private data (pimpl)
+	friend struct IconProviderPrivate;
+
+public:
+	/**
+	 * Default Constructor
+	 */
+	CIconProvider();
+
+	/**
+	 * Virtual Destructor
+	 */
+	virtual ~CIconProvider();
+
+	/**
+	 * The function returns a custom icon if one is registered and a null Icon
+	 * if no custom icon is registered
+	 */
+	QIcon customIcon(eIcon IconId) const;
+
+	/**
+	 * Registers a custom icon for the given IconId
+	 */
+	void registerCustomIcon(eIcon IconId, const QIcon &icon);
+}; // class IconProvider
+
+} // namespace ads
+
+
+//---------------------------------------------------------------------------
+#endif // IconProviderH

src/ads_globals.h

@@ -34,6 +34,7 @@
 #include <QtCore/QtGlobal>
 #include <QPixmap>
 #include <QWidget>
+#include <QDebug>
 
 #ifndef ADS_STATIC
 #ifdef ADS_SHARED_EXPORT
@@ -60,6 +61,13 @@ class QSplitter;
 
 namespace ads
 {
+enum eStateFileVersion
+{
+	InitialVerison = 0,
+	Version1 = 1,
+	CurrentVersion = Version1
+};
+
 class CDockSplitter;
 
 enum DockWidgetArea
@@ -96,6 +104,28 @@ enum eDragState
 	DraggingFloatingWidget//!< DraggingFloatingWidget
 };
 
+/**
+ * The different icons used in the UI
+ */
+enum eIcon
+{
+	TabCloseIcon,      //!< TabCloseIcon
+	DockAreaMenuIcon,  //!< DockAreaMenuIcon
+	DockAreaUndockIcon,//!< DockAreaUndockIcon
+	DockAreaCloseIcon, //!< DockAreaCloseIcon
+
+	IconCount,         //!< just a delimiter for range checks
+};
+
+/**
+ * For bitwise combination of dock wdget features
+ */
+enum eBitwiseOperator
+{
+	BitwiseAnd,
+	BitwiseOr
+};
+
 namespace internal
 {
 static const bool RestoreTesting = true;

src/linux/FloatingWidgetTitleBar.cpp

@@ -77,7 +77,7 @@ void FloatingWidgetTitleBarPrivate::createLayout()
 	TitleLabel->setElideMode(Qt::ElideRight);
 	TitleLabel->setText("DockWidget->windowTitle()");
 	TitleLabel->setObjectName("floatingTitleLabel");
-	TitleLabel->setAlignment(Qt::AlignLeft);
+    TitleLabel->setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
 
 	CloseButton = new tCloseButton();
 	CloseButton->setObjectName("floatingTitleCloseButton");
@@ -145,6 +145,10 @@ void CFloatingWidgetTitleBar::mousePressEvent(QMouseEvent *ev)
 void CFloatingWidgetTitleBar::mouseReleaseEvent(QMouseEvent *ev)
 {
 	d->DragState = DraggingInactive;
+    if (d->FloatingWidget)
+    {
+        d->FloatingWidget->finishDragging();
+    }
 	Super::mouseReleaseEvent(ev);
 }
 

src/src.pro

@@ -35,12 +35,15 @@ HEADERS += \
     DockContainerWidget.h \
     DockManager.h \
     DockWidget.h \
-    DockWidgetTab.h \
+    DockWidgetTab.h \ 
+    DockingStateReader.h \
     FloatingDockContainer.h \
+    FloatingDragPreview.h \
     DockOverlay.h \
     DockSplitter.h \
     DockAreaTitleBar.h \
-    ElidingLabel.h
+    ElidingLabel.h \
+    IconProvider.h
 
 
 SOURCES += \
@@ -50,12 +53,15 @@ SOURCES += \
     DockContainerWidget.cpp \
     DockManager.cpp \
     DockWidget.cpp \
+    DockingStateReader.cpp \
     DockWidgetTab.cpp \
     FloatingDockContainer.cpp \
+    FloatingDragPreview.cpp \
     DockOverlay.cpp \
     DockSplitter.cpp \
     DockAreaTitleBar.cpp \
-    ElidingLabel.cpp
+    ElidingLabel.cpp \
+    IconProvider.cpp
 
 
 unix {