ENH: Version info using Versioneer (#97)

* ENH: Use versioneer for version information.

* FIX: rc.py is a build artifact and should not be version controlled.

* FIX: Move processResourceFile to its own command.

.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\
-\x30\x22\x20\x65\x6e\x63\x6f\x64\x69\x6e\x67\x3d\x22\x55\x54\x46\
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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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-\x2d\x49\x6e\x20\x2e\x20\x53\x56\x47\x20\x56\x65\x72\x73\x69\x6f\
-\x6e\x3a\x20\x36\x2e\x30\x30\x20\x42\x75\x69\x6c\x64\x20\x30\x29\
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-\x00\x65\x00\x66\x00\x61\x00\x75\x00\x6c\x00\x74\x00\x5f\x00\x6c\x00\x69\x00\x6e\x00\x75\x00\x78\x00\x2e\x00\x63\x00\x73\x00\x73\
-\
-\x00\x0b\
-\x0c\xe2\x33\xa3\
-\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\
-\x00\x00\x01\x6d\xaf\xb0\x91\x61\
-\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
@@ -60,6 +68,39 @@ main window layout.
 \
 ![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

@@ -24,6 +24,7 @@ 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 +50,9 @@
 #include <QWidgetAction>
 #include <QComboBox>
 #include <QInputDialog>
+#include <QRubberBand>
+#include <QPlainTextEdit>
+#include <QTableWidget>
 
 #include <QMap>
 #include <QElapsedTimer>
@@ -57,6 +60,7 @@
 #include "DockManager.h"
 #include "DockWidget.h"
 #include "DockAreaWidget.h"
+#include "FloatingDockContainer.h"
 
 
 //============================================================================
@@ -113,6 +117,18 @@ 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 +138,7 @@ 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 +160,45 @@ 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"));
+	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;
+}
+
 
 //============================================================================
 /**
@@ -197,7 +253,6 @@ 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));
@@ -226,8 +281,9 @@ void MainWindowPrivate::createContent()
 	auto BottomDockArea = DockManager->addDockWidget(ads::BottomDockWidgetArea, createLongTextLabelDockWidget(ViewMenu), RighDockArea);
 	DockManager->addDockWidget(ads::RightDockWidgetArea, 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()));
 
 	for (auto DockWidget : DockManager->dockWidgetsMap())
 	{
@@ -240,11 +296,13 @@ 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 +312,16 @@ 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()));
 }
 
 
@@ -310,9 +378,13 @@ 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
+    // 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);
+
+    // uncomment the follwing line if you want to use non opaque undocking and splitter
+    // movements
+    // CDockManager::setConfigFlags(CDockManager::DefaultNonOpaqueConfig);
 
 	// Now create the dock manager and its content
 	d->DockManager = new CDockManager(this);
@@ -328,7 +400,7 @@ CMainWindow::CMainWindow(QWidget *parent) :
 	// Default window geometry
     resize(1280, 720);
 
-	d->restoreState();
+	//d->restoreState();
 	d->restorePerspectives();
 }
 
@@ -395,3 +467,23 @@ void CMainWindow::onViewToggled(bool Open)
 	qDebug() << DockWidget->objectName() << " viewToggled(" << Open << ")";
 }
 
+
+//============================================================================
+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));
+}
+
+
+//============================================================================
+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 +59,8 @@ private slots:
 	void on_actionRestoreState_triggered(bool);
 	void savePerspective();
 	void onViewToggled(bool Open);
+	void createEditor();
+	void createTable();
 };
 
 #endif // MAINWINDOW_H

demo/demo.pro

@@ -20,6 +20,8 @@ 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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+   limitations under the License.

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
 	};
@@ -88,6 +89,8 @@ public:
 
 public slots:
 	void toggleView(bool Open = true);
+    void setFloating();
+    void deleteDockWidget();
 
 signals:
 	void viewToggled(bool Open);

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 +472,13 @@ 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);
+			i -= Offset;
 		}
 	}
 }
@@ -574,6 +618,7 @@ QSize CDockAreaTabBar::minimumSizeHint() const
 	return Size;
 }
 
+
 //===========================================================================
 QSize CDockAreaTabBar::sizeHint() const
 {
@@ -582,6 +627,13 @@ 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 +491,15 @@ 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();
+    }
+    else
+    {
+    	DockWidget->toggleView(false);
+    }
 }
 
 
@@ -787,9 +799,19 @@ 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]->deleteDockWidget();
+	}
+	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
 	 */

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())
 		{

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

@@ -726,6 +726,25 @@ QSize CDockWidget::minimumSizeHint() const
 }
 
 
+//============================================================================
+void CDockWidget::setFloating()
+{
+	if (isClosed())
+	{
+		return;
+	}
+	d->TabWidget->detachDockWidget();
+}
+
+
+//============================================================================
+void CDockWidget::deleteDockWidget()
+{
+	dockManager()->removeDockWidget(this);
+	deleteLater();
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockWidget.h

@@ -143,6 +143,7 @@ public:
 		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
 		AllDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable,
 		NoDockWidgetFeatures = 0x00
 	};
@@ -250,7 +251,8 @@ public:
 	QWidget* widget() const;
 
 	/**
-	 * Returns the title bar widget of this dock widget
+	 * Returns the tab widget of this dock widget that is shown in the dock
+	 * area title bar
 	 */
 	CDockWidgetTab* tabWidget() const;
 
@@ -392,13 +394,13 @@ public:
 	QSize toolBarIconSize(eState State) const;
 
 
-	#ifndef QT_NO_TOOLTIP
+#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
+#endif
 
 public: // reimplements QFrame -----------------------------------------------
 	/**
@@ -413,6 +415,17 @@ public slots:
 	 */
 	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();
+
 signals:
 	/**
 	 * This signal is emitted if the dock widget is opened or closed

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>
 
@@ -69,10 +71,11 @@ struct DockWidgetTabPrivate
 	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();
@@ -224,31 +248,34 @@ bool DockWidgetTabPrivate::startFloating(eDragState DraggingState)
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
 	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;
 }
 
@@ -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->DragStartMousePosition = 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);
 }
 
@@ -345,6 +388,12 @@ 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;
@@ -352,6 +401,12 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
     else if (d->DockArea->openDockWidgetsCount() > 1
      && (ev->pos() - d->DragStartMousePosition).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;
 	}
@@ -364,10 +419,14 @@ void CDockWidgetTab::mouseMoveEvent(QMouseEvent* ev)
 void CDockWidgetTab::contextMenuEvent(QContextMenuEvent* ev)
 {
 	ev->accept();
+	if (d->isDraggingState(DraggingFloatingWidget))
+	{
+		return;
+	}
 
 	d->DragStartMousePosition = ev->pos();
 	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()));
@@ -522,7 +581,7 @@ bool CDockWidgetTab::isClosable() const
 
 
 //===========================================================================
-void CDockWidgetTab::onDetachActionTriggered()
+void CDockWidgetTab::detachDockWidget()
 {
 	if (!d->DockWidget->features().testFlag(CDockWidget::DockWidgetFloatable))
 	{

src/DockWidgetTab.h

@@ -57,7 +57,7 @@ private:
 	void onDockWidgetFeaturesChanged();
 
 private slots:
-	void onDetachActionTriggered();
+	void detachDockWidget();
 
 protected:
 	virtual void mousePressEvent(QMouseEvent* ev) override;

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

@@ -260,11 +260,6 @@ 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 +270,11 @@ CFloatingDockContainer::CFloatingDockContainer(CDockAreaWidget *DockArea) :
 #ifdef Q_OS_LINUX
     d->TitleBar->enableCloseButton(isClosable());
 #endif
+    auto TopLevelDockWidget = topLevelDockWidget();
+    if (TopLevelDockWidget)
+    {
+    	TopLevelDockWidget->emitTopLevelChanged(true);
+    }
 }
 
 //============================================================================
@@ -285,6 +285,11 @@ CFloatingDockContainer::CFloatingDockContainer(CDockWidget *DockWidget) :
 #ifdef Q_OS_LINUX
     d->TitleBar->enableCloseButton(isClosable());
 #endif
+    auto TopLevelDockWidget = topLevelDockWidget();
+    if (TopLevelDockWidget)
+    {
+    	TopLevelDockWidget->emitTopLevelChanged(true);
+    }
 }
 
 //============================================================================
@@ -329,6 +334,13 @@ 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;
@@ -343,6 +355,13 @@ void CFloatingDockContainer::closeEvent(QCloseEvent *event)
 
 	if (isClosable())
 	{
+		auto TopLevelDockWidget = topLevelDockWidget();
+		if (TopLevelDockWidget && TopLevelDockWidget->features().testFlag(CDockWidget::DockWidgetDeleteOnClose))
+		{
+			TopLevelDockWidget->deleteDockWidget();
+			this->deleteLater();
+		}
+
 		// 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:
@@ -373,6 +392,11 @@ 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 +495,6 @@ 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 +507,9 @@ 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 +519,6 @@ void CFloatingDockContainer::startFloating(const QPoint &DragStartMousePos,
 #endif
 	moveFloating();
 	show();
-
 }
 
 //============================================================================
@@ -583,7 +584,7 @@ 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 +628,7 @@ 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 class 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 class 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 +104,19 @@ 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
+};
+
 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 {