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/*
* Copyright (c) 2014-2017 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swift/QtUI/Trellis/QtDNDTabBar.h>
#include <cassert>
#include <QDrag>
#include <QDropEvent>
#include <QMimeData>
#include <QMouseEvent>
#include <QPainter>
#include <QTabWidget>
namespace Swift {
QtDNDTabBar::QtDNDTabBar(QWidget* parent) : QTabBar(parent) {
setAcceptDrops(true);
// detect the default tab bar height;
insertTab(0, "");
defaultTabHeight = QTabBar::sizeHint().height();
removeTab(0);
}
QtDNDTabBar::~QtDNDTabBar() {
}
int QtDNDTabBar::getDragIndex() const {
return dragIndex;
}
QString QtDNDTabBar::getDragText() const {
return dragText;
}
QWidget* QtDNDTabBar::getDragWidget() const {
return dragWidget;
}
QSize QtDNDTabBar::sizeHint() const {
QSize hint = QTabBar::sizeHint();
if (hint.isEmpty()) {
hint = QSize(parentWidget()->width(), defaultTabHeight);
}
return hint;
}
QSize QtDNDTabBar::tabSizeHint(int index) const {
QSize tabSize = QTabBar::tabSizeHint(index);
#if defined(Q_OS_MAC)
// With multiple tabs having the same label in a QTabBar, the size hint computed by
// Qt on OS X is too small and it is elided even though there is enough horizontal
// space available. We work around this issue by adding the width of a letter to the
// size hint.
tabSize += QSize(QFontMetrics(font()).width("I"), 0);
#endif
return tabSize;
}
void QtDNDTabBar::dragEnterEvent(QDragEnterEvent* dragEnterEvent) {
QtDNDTabBar* sourceTabBar = dynamic_cast<QtDNDTabBar*>(dragEnterEvent->source());
if (sourceTabBar) {
dragEnterEvent->acceptProposedAction();
}
}
void QtDNDTabBar::dropEvent(QDropEvent* dropEvent) {
auto sourceTabBar = dynamic_cast<QtDNDTabBar*>(dropEvent->source());
if (sourceTabBar && dropEvent->mimeData() && dropEvent->mimeData()->data("action") == QByteArray("application/tab-detach")) {
int targetTabIndex = tabAt(dropEvent->pos());
QRect rect = tabRect(targetTabIndex);
if (targetTabIndex >= 0 && (dropEvent->pos().x() - rect.left() - rect.width()/2 > 0)) {
targetTabIndex++;
}
QWidget* tab = sourceTabBar->getDragWidget();
assert(tab);
QTabWidget* targetTabWidget = dynamic_cast<QTabWidget*>(parentWidget());
QString tabText = sourceTabBar->getDragText();
/*
* When you add a widget to an empty QTabWidget, it's automatically made the current widget.
* Making the widget the current widget, widget->show() is called for the widget. Directly reacting
* to that event, and adding the widget again to the QTabWidget results in undefined behavior. For
* example the tab label is shown but the widget is neither has the old nor in the new QTabWidget as
* parent. Blocking signals on the QWidget to be added to a QTabWidget prevents this behavior.
*/
targetTabWidget->setUpdatesEnabled(false);
tab->blockSignals(true);
targetTabWidget->insertTab(targetTabIndex, tab, tabText);
dropEvent->acceptProposedAction();
tab->blockSignals(false);
targetTabWidget->setUpdatesEnabled(true);
onDropSucceeded();
}
}
bool QtDNDTabBar::event(QEvent* event) {
QMouseEvent* mouseEvent = dynamic_cast<QMouseEvent*>(event);
if (mouseEvent) {
QWidget* childAtPoint = window()->childAt(mapTo(window(), mouseEvent->pos()));
QtDNDTabBar* underMouse = dynamic_cast<QtDNDTabBar*>(childAtPoint);
if (!underMouse && childAtPoint) {
underMouse = dynamic_cast<QtDNDTabBar*>(childAtPoint->parent());
}
if (!underMouse && currentIndex() >= 0) {
// detach and drag
// stop move event
QMouseEvent* finishMoveEvent = new QMouseEvent (QEvent::MouseMove, mouseEvent->pos (), Qt::NoButton, Qt::NoButton, Qt::NoModifier);
QTabBar::event(finishMoveEvent);
delete finishMoveEvent;
finishMoveEvent = nullptr;
// start drag
QDrag* drag = new QDrag(this);
QMimeData* mimeData = new QMimeData;
// distinguish tab-reordering drops from other ones
mimeData->setData("action", "application/tab-detach") ;
drag->setMimeData(mimeData);
// set drag image
QRect rect = tabRect( currentIndex() );
#if QT_VERSION >= 0x050000
QPixmap pixmap = grab(rect);
#else
QPixmap pixmap = QPixmap::grabWidget(this, rect);
#endif
QPixmap targetPixmap (pixmap.size ());
QPainter painter (&targetPixmap);
painter.setOpacity(0.9);
painter.drawPixmap(0,0, pixmap);
painter.end ();
drag->setPixmap (targetPixmap);
drag->setHotSpot(QPoint(drag->pixmap().width()/2, drag->pixmap().height()));
dragIndex = currentIndex();
dragText = tabText(dragIndex);
dragWidget = dynamic_cast<QTabWidget*>(parent())->widget(dragIndex);
assert(dragWidget);
dynamic_cast<QTabWidget*>(parent())->removeTab(currentIndex());
Qt::DropAction dropAction = drag->exec();
if (dropAction == Qt::IgnoreAction) {
// aborted drag, put tab back in place
// disable event handling during the insert for the tab to prevent infinite recursion (stack overflow)
dragWidget->blockSignals(true);
dynamic_cast<QTabWidget*>(parent())->insertTab(dragIndex, dragWidget, dragText);
dragWidget->blockSignals(false);
}
return true;
}
}
return QTabBar::event(event);
}
}
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