Qt-Advanced-Docking-System/src/linux/FloatingWidgetTitleBar.cpp

/*******************************************************************************
** Qt Advanced Docking System
** Copyright (C) 2017 Uwe Kindler
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/


//============================================================================
/// \file   FloatingWidgetTitleBar.cpp
/// \author Uwe Kindler
/// \date   13.05.2019
/// \brief  Implementation of CFloatingWidgetTitleBar class
//============================================================================

//============================================================================
//                                   INCLUDES
//============================================================================
#include "FloatingWidgetTitleBar.h"

#include <iostream>

#include <QHBoxLayout>
#include <QPushButton>
#include <QToolButton>
#include <QPixmap>
#include <QStyle>
#include <QMouseEvent>

#include "ads_globals.h"
#include "ElidingLabel.h"
#include "FloatingDockContainer.h"

namespace ads
{

using tTabLabel = CElidingLabel;
using tCloseButton = QPushButton;


/**
 * @brief Private data class of public interface CFloatingWidgetTitleBar
 */
struct FloatingWidgetTitleBarPrivate
{
    CFloatingWidgetTitleBar* _this; ///< public interface class
    QLabel* IconLabel = nullptr;
    tTabLabel* TitleLabel;
    tCloseButton* CloseButton = nullptr;
    CFloatingDockContainer* FloatingWidget = nullptr;
    eDragState DragState = DraggingInactive;

    FloatingWidgetTitleBarPrivate(CFloatingWidgetTitleBar* _public) : _this(_public) {}

    /**
     * Creates the complete layout including all controls
     */
    void createLayout();
};


//============================================================================
void FloatingWidgetTitleBarPrivate::createLayout()
{
    TitleLabel = new tTabLabel();
    TitleLabel->setElideMode(Qt::ElideRight);
    TitleLabel->setText("DockWidget->windowTitle()");
    TitleLabel->setObjectName("floatingTitleLabel");
    TitleLabel->setAlignment(Qt::AlignLeft);

    CloseButton = new tCloseButton();
    CloseButton->setObjectName("floatingTitleCloseButton");
    CloseButton->setFlat(true);
    //CloseButton->setAutoRaise(true);
    // 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);
    CloseButton->setIcon(_this->style()->standardIcon(QStyle::SP_TitleBarCloseButton));
    CloseButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    CloseButton->setVisible(true);
    CloseButton->setFocusPolicy(Qt::NoFocus);
    _this->connect(CloseButton, SIGNAL(clicked()), SIGNAL(closeRequested()));

    QFontMetrics fm(TitleLabel->font());
    int Spacing = qRound(fm.height() / 4.0);

    // Fill the layout
    QBoxLayout* Layout = new QBoxLayout(QBoxLayout::LeftToRight);
    Layout->setContentsMargins(6,0,0,0);
    Layout->setSpacing(0);
    _this->setLayout(Layout);
    Layout->addWidget(TitleLabel, 1);
    Layout->addSpacing(Spacing);
    Layout->addWidget(CloseButton);
    Layout->setAlignment(Qt::AlignCenter);

    TitleLabel->setVisible(true);
}


//============================================================================
CFloatingWidgetTitleBar::CFloatingWidgetTitleBar(CFloatingDockContainer *parent)
    : QWidget(parent),
      d(new FloatingWidgetTitleBarPrivate(this))
{
    d->FloatingWidget = parent;
    d->createLayout();
}


//============================================================================
CFloatingWidgetTitleBar::~CFloatingWidgetTitleBar()
{
    delete d;
}


//============================================================================
void CFloatingWidgetTitleBar::mousePressEvent(QMouseEvent* ev)
{
    if (ev->button() == Qt::LeftButton)
    {
        d->DragState = DraggingFloatingWidget;
        d->FloatingWidget->startDragging(ev->pos(), d->FloatingWidget->size(), this);
        return;
    }
    Super::mousePressEvent(ev);
}


//============================================================================
void CFloatingWidgetTitleBar::mouseReleaseEvent(QMouseEvent* ev)
{
    d->DragState = DraggingInactive;
    Super::mouseReleaseEvent(ev);
}


//============================================================================
void CFloatingWidgetTitleBar::mouseMoveEvent(QMouseEvent* ev)
{
    if (!(ev->buttons() & Qt::LeftButton) || DraggingInactive == d->DragState)
    {
        d->DragState = DraggingInactive;
        Super::mouseMoveEvent(ev);
        return;
    }

    // move floating window
    if (DraggingFloatingWidget == d->DragState)
    {
        d->FloatingWidget->moveFloating();
        Super::mouseMoveEvent(ev);
        return;
    }
    Super::mouseMoveEvent(ev);
}


//============================================================================
void CFloatingWidgetTitleBar::enableCloseButton(bool Enable)
{
    d->CloseButton->setEnabled(Enable);
}


//============================================================================
void CFloatingWidgetTitleBar::setTitle(const QString& Text)
{
    d->TitleLabel->setText(Text);
}


} // namespace ads