DockAreaTitleBar.cpp

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/*******************************************************************************
** 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/>.
******************************************************************************/
 
 
//============================================================================
//============================================================================
 
//============================================================================
//                                   INCLUDES
//============================================================================
#include "DockAreaTitleBar.h"
 
#include <QPushButton>
#include <QToolButton>
#include <QBoxLayout>
#include <QStyle>
#include <QMenu>
#include <QScrollArea>
#include <QMouseEvent>
#include <QDebug>
#include <QPointer>
 
#include "DockAreaTitleBar_p.h"
#include "ads_globals.h"
#include "FloatingDockContainer.h"
#include "FloatingDragPreview.h"
#include "DockAreaWidget.h"
#include "DockOverlay.h"
#include "DockManager.h"
#include "DockWidget.h"
#include "DockWidgetTab.h"
#include "DockAreaTabBar.h"
#include "IconProvider.h"
#include "DockComponentsFactory.h"
 
#include <iostream>
 
namespace ads
{
 
struct DockAreaTitleBarPrivate
{
        CDockAreaTitleBar* _this;
        QPointer<tTitleBarButton> TabsMenuButton;
        QPointer<tTitleBarButton> UndockButton;
        QPointer<tTitleBarButton> CloseButton;
        QBoxLayout* Layout;
        CDockAreaWidget* DockArea;
        CDockAreaTabBar* TabBar;
        bool MenuOutdated = true;
        QMenu* TabsMenu;
        QList<tTitleBarButton*> DockWidgetActionsButtons;
 
        QPoint DragStartMousePos;
        eDragState DragState = DraggingInactive;
        IFloatingWidget* FloatingWidget = nullptr;
 
 
        DockAreaTitleBarPrivate(CDockAreaTitleBar* _public);
 
        void createButtons();
 
        void createTabBar();
 
        CDockManager* dockManager() const
        {
                return DockArea->dockManager();
        }
 
        static bool testConfigFlag(CDockManager::eConfigFlag Flag)
        {
                return CDockManager::testConfigFlag(Flag);
        }
 
        bool isDraggingState(eDragState dragState) const
        {
                return this->DragState == dragState;
        }
 
 
        void startFloating(const QPoint& Offset);
 
        IFloatingWidget* makeAreaFloating(const QPoint& Offset, eDragState DragState);
};// struct DockAreaTitleBarPrivate
 
//============================================================================
DockAreaTitleBarPrivate::DockAreaTitleBarPrivate(CDockAreaTitleBar* _public) :
        _this(_public)
{
 
}
 
 
//============================================================================
void DockAreaTitleBarPrivate::createButtons()
{
        QSizePolicy ButtonSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
 
        // Tabs menu button
        TabsMenuButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasTabsMenuButton));
        TabsMenuButton->setObjectName("tabsMenuButton");
        TabsMenuButton->setAutoRaise(true);
        TabsMenuButton->setPopupMode(QToolButton::InstantPopup);
        internal::setButtonIcon(TabsMenuButton, QStyle::SP_TitleBarUnshadeButton, ads::DockAreaMenuIcon);
        QMenu* TabsMenu = new QMenu(TabsMenuButton);
#ifndef QT_NO_TOOLTIP
        TabsMenu->setToolTipsVisible(true);
#endif
        _this->connect(TabsMenu, SIGNAL(aboutToShow()), SLOT(onTabsMenuAboutToShow()));
        TabsMenuButton->setMenu(TabsMenu);
        internal::setToolTip(TabsMenuButton, QObject::tr("List All Tabs"));
        TabsMenuButton->setSizePolicy(ButtonSizePolicy);
        Layout->addWidget(TabsMenuButton, 0);
        _this->connect(TabsMenuButton->menu(), SIGNAL(triggered(QAction*)),
                SLOT(onTabsMenuActionTriggered(QAction*)));
 
        // Undock button
        UndockButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasUndockButton));
        UndockButton->setObjectName("detachGroupButton");
        UndockButton->setAutoRaise(true);
        internal::setToolTip(UndockButton, QObject::tr("Detach Group"));
        internal::setButtonIcon(UndockButton, QStyle::SP_TitleBarNormalButton, ads::DockAreaUndockIcon);
        UndockButton->setSizePolicy(ButtonSizePolicy);
        Layout->addWidget(UndockButton, 0);
        _this->connect(UndockButton, SIGNAL(clicked()), SLOT(onUndockButtonClicked()));
 
        // Close button
        CloseButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasCloseButton));
        CloseButton->setObjectName("dockAreaCloseButton");
        CloseButton->setAutoRaise(true);
        internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
        if (testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
        {
                internal::setToolTip(CloseButton, QObject::tr("Close Active Tab"));
        }
        else
        {
                internal::setToolTip(CloseButton, QObject::tr("Close Group"));
        }
        CloseButton->setSizePolicy(ButtonSizePolicy);
        CloseButton->setIconSize(QSize(16, 16));
        Layout->addWidget(CloseButton, 0);
        _this->connect(CloseButton, SIGNAL(clicked()), SLOT(onCloseButtonClicked()));
}
 
 
//============================================================================
void DockAreaTitleBarPrivate::createTabBar()
{
        TabBar = componentsFactory()->createDockAreaTabBar(DockArea);
    TabBar->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);
        Layout->addWidget(TabBar);
        _this->connect(TabBar, SIGNAL(tabClosed(int)), SLOT(markTabsMenuOutdated()));
        _this->connect(TabBar, SIGNAL(tabOpened(int)), SLOT(markTabsMenuOutdated()));
        _this->connect(TabBar, SIGNAL(tabInserted(int)), SLOT(markTabsMenuOutdated()));
        _this->connect(TabBar, SIGNAL(removingTab(int)), SLOT(markTabsMenuOutdated()));
        _this->connect(TabBar, SIGNAL(tabMoved(int, int)), SLOT(markTabsMenuOutdated()));
        _this->connect(TabBar, SIGNAL(currentChanged(int)), SLOT(onCurrentTabChanged(int)));
        _this->connect(TabBar, SIGNAL(tabBarClicked(int)), SIGNAL(tabBarClicked(int)));
        _this->connect(TabBar, SIGNAL(elidedChanged(bool)), SLOT(markTabsMenuOutdated()));
}
 
 
//============================================================================
IFloatingWidget* DockAreaTitleBarPrivate::makeAreaFloating(const QPoint& Offset, eDragState DragState)
{
        QSize Size = DockArea->size();
        this->DragState = DragState;
        bool OpaqueUndocking = CDockManager::testConfigFlag(CDockManager::OpaqueUndocking) ||
                (DraggingFloatingWidget != DragState);
        CFloatingDockContainer* FloatingDockContainer = nullptr;
        IFloatingWidget* FloatingWidget;
        if (OpaqueUndocking)
        {
                FloatingWidget = FloatingDockContainer = new CFloatingDockContainer(DockArea);
        }
        else
        {
                auto w = new CFloatingDragPreview(DockArea);
                QObject::connect(w, &CFloatingDragPreview::draggingCanceled, [=]()
                {
                        this->DragState = DraggingInactive;
                });
                FloatingWidget = w;
        }
 
    FloatingWidget->startFloating(Offset, Size, DragState, nullptr);
    if (FloatingDockContainer)
    {
                auto TopLevelDockWidget = FloatingDockContainer->topLevelDockWidget();
                if (TopLevelDockWidget)
                {
                        TopLevelDockWidget->emitTopLevelChanged(true);
                }
    }
 
        return FloatingWidget;
}
 
 
//============================================================================
void DockAreaTitleBarPrivate::startFloating(const QPoint& Offset)
{
        FloatingWidget = makeAreaFloating(Offset, DraggingFloatingWidget);
}
 
 
//============================================================================
CDockAreaTitleBar::CDockAreaTitleBar(CDockAreaWidget* parent) :
        QFrame(parent),
        d(new DockAreaTitleBarPrivate(this))
{
        d->DockArea = parent;
 
        setObjectName("dockAreaTitleBar");
        d->Layout = new QBoxLayout(QBoxLayout::LeftToRight);
        d->Layout->setContentsMargins(0, 0, 0, 0);
        d->Layout->setSpacing(0);
        setLayout(d->Layout);
        setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 
        d->createTabBar();
        d->Layout->addWidget(new CSpacerWidget(this));
        d->createButtons();
 
    setFocusPolicy(Qt::NoFocus);
}
 
 
//============================================================================
CDockAreaTitleBar::~CDockAreaTitleBar()
{
        if (!d->CloseButton.isNull())
        {
                delete d->CloseButton;
        }
 
        if (!d->TabsMenuButton.isNull())
        {
                delete d->TabsMenuButton;
        }
 
        if (!d->UndockButton.isNull())
        {
                delete d->UndockButton;
        }
        delete d;
}
 
 
//============================================================================
CDockAreaTabBar* CDockAreaTitleBar::tabBar() const
{
        return d->TabBar;
}
 
//============================================================================
void CDockAreaTitleBar::markTabsMenuOutdated()
{
        if(DockAreaTitleBarPrivate::testConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility))
        {
                bool hasElidedTabTitle = false;
                for (int i = 0; i < d->TabBar->count(); ++i)
                {
                        if (!d->TabBar->isTabOpen(i))
                        {
                                continue;
                        }
                        CDockWidgetTab* Tab = d->TabBar->tab(i);
                        if(Tab->isTitleElided())
                        {
                                hasElidedTabTitle = true;
                                break;
                        }
                }
                bool visible = (hasElidedTabTitle && (d->TabBar->count() > 1));
                QMetaObject::invokeMethod(d->TabsMenuButton, "setVisible", Qt::QueuedConnection, Q_ARG(bool, visible));
        }
        d->MenuOutdated = true;
}
 
//============================================================================
void CDockAreaTitleBar::onTabsMenuAboutToShow()
{
        if (!d->MenuOutdated)
        {
                return;
        }
 
        QMenu* menu = d->TabsMenuButton->menu();
        menu->clear();
        for (int i = 0; i < d->TabBar->count(); ++i)
        {
                if (!d->TabBar->isTabOpen(i))
                {
                        continue;
                }
                auto Tab = d->TabBar->tab(i);
                QAction* Action = menu->addAction(Tab->icon(), Tab->text());
                internal::setToolTip(Action, Tab->toolTip());
                Action->setData(i);
        }
 
        d->MenuOutdated = false;
}
 
 
//============================================================================
void CDockAreaTitleBar::onCloseButtonClicked()
{
    ADS_PRINT("CDockAreaTitleBar::onCloseButtonClicked");
        if (d->testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
        {
                d->TabBar->closeTab(d->TabBar->currentIndex());
        }
        else
        {
                d->DockArea->closeArea();
        }
}
 
 
//============================================================================
void CDockAreaTitleBar::onUndockButtonClicked()
{
        if (d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
        {
                d->makeAreaFloating(mapFromGlobal(QCursor::pos()), DraggingInactive);
        }
}
 
 
//============================================================================
void CDockAreaTitleBar::onTabsMenuActionTriggered(QAction* Action)
{
        int Index = Action->data().toInt();
        d->TabBar->setCurrentIndex(Index);
        emit tabBarClicked(Index);
}
 
 
//============================================================================
void CDockAreaTitleBar::updateDockWidgetActionsButtons()
{
        CDockWidget* DockWidget = d->TabBar->currentTab()->dockWidget();
        if (!d->DockWidgetActionsButtons.isEmpty())
        {
                for (auto Button : d->DockWidgetActionsButtons)
                {
                        d->Layout->removeWidget(Button);
                        delete Button;
                }
                d->DockWidgetActionsButtons.clear();
        }
 
        auto Actions = DockWidget->titleBarActions();
        if (Actions.isEmpty())
        {
                return;
        }
 
        int InsertIndex = indexOf(d->TabsMenuButton);
        for (auto Action : Actions)
        {
                auto Button = new CTitleBarButton(true, this);
                Button->setDefaultAction(Action);
                Button->setAutoRaise(true);
                Button->setPopupMode(QToolButton::InstantPopup);
                Button->setObjectName(Action->objectName());
                d->Layout->insertWidget(InsertIndex++, Button, 0);
                d->DockWidgetActionsButtons.append(Button);
        }
}
 
 
//============================================================================
void CDockAreaTitleBar::onCurrentTabChanged(int Index)
{
        if (Index < 0)
        {
                return;
        }
 
        if (d->testConfigFlag(CDockManager::DockAreaCloseButtonClosesTab))
        {
                CDockWidget* DockWidget = d->TabBar->tab(Index)->dockWidget();
                d->CloseButton->setEnabled(DockWidget->features().testFlag(CDockWidget::DockWidgetClosable));
        }
 
        updateDockWidgetActionsButtons();
}
 
 
//============================================================================
QAbstractButton* CDockAreaTitleBar::button(TitleBarButton which) const
{
        switch (which)
        {
        case TitleBarButtonTabsMenu: return d->TabsMenuButton;
        case TitleBarButtonUndock: return d->UndockButton;
        case TitleBarButtonClose: return d->CloseButton;
        default:
                return nullptr;
        }
}
 
 
//============================================================================
void CDockAreaTitleBar::setVisible(bool Visible)
{
        Super::setVisible(Visible);
        markTabsMenuOutdated();
}
 
 
//============================================================================
void CDockAreaTitleBar::mousePressEvent(QMouseEvent* ev)
{
        if (ev->button() == Qt::LeftButton)
        {
                ev->accept();
                d->DragStartMousePos = ev->pos();
                d->DragState = DraggingMousePressed;
 
                if (CDockManager::testConfigFlag(CDockManager::FocusHighlighting))
                {
                        d->TabBar->currentTab()->setFocus(Qt::OtherFocusReason);
                }
                return;
        }
        Super::mousePressEvent(ev);
}
 
 
//============================================================================
void CDockAreaTitleBar::mouseReleaseEvent(QMouseEvent* ev)
{
        if (ev->button() == Qt::LeftButton)
        {
        ADS_PRINT("CDockAreaTitleBar::mouseReleaseEvent");
                ev->accept();
                auto CurrentDragState = d->DragState;
                d->DragStartMousePos = QPoint();
                d->DragState = DraggingInactive;
                if (DraggingFloatingWidget == CurrentDragState)
                {
                        d->FloatingWidget->finishDragging();
                }
 
                return;
        }
        Super::mouseReleaseEvent(ev);
}
 
 
//============================================================================
void CDockAreaTitleBar::mouseMoveEvent(QMouseEvent* ev)
{
        Super::mouseMoveEvent(ev);
        if (!(ev->buttons() & Qt::LeftButton) || d->isDraggingState(DraggingInactive))
        {
                d->DragState = DraggingInactive;
                return;
        }
 
    // move floating window
    if (d->isDraggingState(DraggingFloatingWidget))
    {
        d->FloatingWidget->moveFloating();
        return;
    }
 
        // If this is the last dock area in a floating dock container it does not make
        // sense to move it to a new floating widget and leave this one
        // empty
        if (d->DockArea->dockContainer()->isFloating()
         && d->DockArea->dockContainer()->visibleDockAreaCount() == 1)
        {
                return;
        }
 
        // If one single dock widget in this area is not floatable then the whole
        // area is not floatable
        // If we do non opaque undocking, then we can create the floating drag
        // preview if the dock widget is movable
        auto Features = d->DockArea->features();
    if (!Features.testFlag(CDockWidget::DockWidgetFloatable)
    && !(Features.testFlag(CDockWidget::DockWidgetMovable) && !CDockManager::testConfigFlag(CDockManager::OpaqueUndocking)))
        {
                return;
        }
 
        int DragDistance = (d->DragStartMousePos - ev->pos()).manhattanLength();
        if (DragDistance >= CDockManager::startDragDistance())
        {
        ADS_PRINT("CDockAreaTitlBar::startFloating");
                d->startFloating(d->DragStartMousePos);
                auto Overlay = d->DockArea->dockManager()->containerOverlay();
                Overlay->setAllowedAreas(OuterDockAreas);
        }
 
        return;
}
 
 
//============================================================================
void CDockAreaTitleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
        // 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
        // empty
        if (d->DockArea->dockContainer()->isFloating() && d->DockArea->dockContainer()->dockAreaCount() == 1)
        {
                return;
        }
 
        if (!d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable))
        {
                return;
        }
        d->makeAreaFloating(event->pos(), DraggingInactive);
}
 
 
//============================================================================
void CDockAreaTitleBar::contextMenuEvent(QContextMenuEvent* ev)
{
        ev->accept();
        if (d->isDraggingState(DraggingFloatingWidget))
        {
                return;
        }
 
        QMenu Menu(this);
        auto Action = Menu.addAction(tr("Detach Group"), this, SLOT(onUndockButtonClicked()));
        Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetFloatable));
        Menu.addSeparator();
        Action = Menu.addAction(tr("Close Group"), this, SLOT(onCloseButtonClicked()));
        Action->setEnabled(d->DockArea->features().testFlag(CDockWidget::DockWidgetClosable));
        Menu.addAction(tr("Close Other Groups"), d->DockArea, SLOT(closeOtherAreas()));
        Menu.exec(ev->globalPos());
}
 
 
//============================================================================
void CDockAreaTitleBar::insertWidget(int index, QWidget *widget)
{
        d->Layout->insertWidget(index, widget);
}
 
 
//============================================================================
int CDockAreaTitleBar::indexOf(QWidget *widget) const
{
        return d->Layout->indexOf(widget);
}
 
//============================================================================
CTitleBarButton::CTitleBarButton(bool visible, QWidget* parent)
        : tTitleBarButton(parent),
          Visible(visible),
          HideWhenDisabled(CDockManager::testConfigFlag(CDockManager::DockAreaHideDisabledButtons))
{
    setFocusPolicy(Qt::NoFocus);
}
 
//============================================================================
void CTitleBarButton::setVisible(bool visible)
{
        // 'visible' can stay 'true' if and only if this button is configured to generaly visible:
        visible = visible && this->Visible;
 
        // 'visible' can stay 'true' unless: this button is configured to be invisible when it is disabled and it is currently disabled:
        if (visible && HideWhenDisabled)
        {
                visible = isEnabled();
        }
 
        Super::setVisible(visible);
}
 
//============================================================================
bool CTitleBarButton::event(QEvent *ev)
{
        if (QEvent::EnabledChange == ev->type() && HideWhenDisabled)
        {
                // force setVisible() call 
                // Calling setVisible() directly here doesn't work well when button is expected to be shown first time
                QMetaObject::invokeMethod(this, "setVisible", Qt::QueuedConnection, Q_ARG(bool, isEnabled()));
        }
 
        return Super::event(ev);
}
 
//============================================================================
CSpacerWidget::CSpacerWidget(QWidget* Parent /*= 0*/) : Super(Parent)
{
        setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        setStyleSheet("border: none; background: none;");
}
 
} // namespace ads
 
//---------------------------------------------------------------------------
// EOF DockAreaTitleBar.cpp