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/*
Copyright (C) 2014 Kuzma Shapran <kuzma.shapran@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "tabbar.h"
#include <QPointer>
#include <QMouseEvent>
#include <QApplication>
#include <QDrag>
#include <QMimeData>
#include <algorithm>
namespace PCManFM {
const char* TabBar::tabDropped = "_pcmanfm_tab_dropped";
TabBar::TabBar(QWidget *parent):
QTabBar(parent),
dragStarted_(false),
detachable_(true)
{
setElideMode(Qt::ElideRight); // works with minimumTabSizeHint()
}
void TabBar::mousePressEvent(QMouseEvent *event) {
QTabBar::mousePressEvent(event);
if(detachable_) {
if(event->button() == Qt::LeftButton && tabAt(event->pos()) > -1) {
dragStartPosition_ = event->pos();
}
else {
dragStartPosition_ = QPoint();
}
dragStarted_ = false;
}
}
void TabBar::mouseMoveEvent(QMouseEvent *event)
{
if(!detachable_) {
QTabBar::mouseMoveEvent(event);
return;
}
if(!dragStarted_ && !dragStartPosition_.isNull()
&& (event->pos() - dragStartPosition_).manhattanLength() >= QApplication::startDragDistance()) {
dragStarted_ = true;
}
if((event->buttons() & Qt::LeftButton)
&& dragStarted_
&& !window()->geometry().contains(event->globalPosition().toPoint())) {
if(currentIndex() == -1) {
return;
}
// NOTE: To be on the safe side (especially under Wayland), we detach or drop the tab
// only after finishing the DND; see MainWindow::dropEvent and the queued connection
// to TabBar::tabDetached in MainWindow.
QPointer<QDrag> drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setData(QStringLiteral("application/pcmanfm-qt-tab"), QByteArray());
drag->setMimeData(mimeData);
int N = count();
Qt::DropAction dragged = drag->exec(Qt::MoveAction);
if(dragged != Qt::MoveAction) {
// The drop was not accepted (by any PCManFM-Qt window).
// The tab will be detached if there is more than one tab.
if(N > 1) {
Q_EMIT tabDetached();
}
else {
finishMouseMoveEvent();
}
}
else {
// Since another app can also accept this drop, we check if the object property
// "_pcmanfm_tab_dropped" is set (by MainWindow::dropEvent) and detach the tab
// if it is not; otherwise, the tab will be dropped into one of our windows.
if(property(tabDropped).toBool()) {
setProperty(tabDropped, QVariant()); // reset the property
}
else {
if(N > 1)
Q_EMIT tabDetached();
else
finishMouseMoveEvent();
}
}
event->accept();
drag->deleteLater();
}
else {
QTabBar::mouseMoveEvent(event);
}
}
void TabBar::finishMouseMoveEvent() {
QMouseEvent finishingEvent(QEvent::MouseMove, QPoint(), QCursor::pos(), Qt::NoButton, Qt::NoButton, Qt::NoModifier);
mouseMoveEvent(&finishingEvent);
}
void TabBar::releaseMouse() {
QMouseEvent releasingEvent(QEvent::MouseButtonRelease, QPoint(), QCursor::pos(), Qt::LeftButton, Qt::NoButton, Qt::NoModifier);
mouseReleaseEvent(&releasingEvent);
}
void TabBar::mouseReleaseEvent(QMouseEvent *event) {
if(detachable_) { // reset drag info
dragStarted_ = false;
dragStartPosition_ = QPoint();
}
if (event->button() == Qt::MiddleButton) {
int index = tabAt(event->pos());
if (index != -1) {
Q_EMIT tabCloseRequested(index);
}
}
QTabBar::mouseReleaseEvent(event);
}
// Let the main window receive dragged tabs!
void TabBar::dragEnterEvent(QDragEnterEvent *event) {
if(detachable_ && event->mimeData()->hasFormat(QStringLiteral("application/pcmanfm-qt-tab"))) {
event->ignore();
}
}
// Limit the size of large tabs to 2/3 of the width of the tabbar.
QSize TabBar::tabSizeHint(int index) const {
switch (shape()) {
case QTabBar::RoundedWest:
case QTabBar::TriangularWest:
case QTabBar::RoundedEast:
case QTabBar::TriangularEast:
return QSize(QTabBar::tabSizeHint(index).width(),
std::min(2 * height() / 3, QTabBar::tabSizeHint(index).height()));
default:
return QSize(std::min(2 * width() / 3, QTabBar::tabSizeHint(index).width()),
QTabBar::tabSizeHint(index).height());
}
}
// Set minimumTabSizeHint to tabSizeHint to keep tabs from shrinking with eliding.
QSize TabBar::minimumTabSizeHint(int index) const {
return tabSizeHint(index);
}
void TabBar::tabInserted(int index) {
// WARNING: Qt6 has a bug that does not show the tabbar in our window on inserting the first
// tab unless the tab layout is updated after its insertion. Usually, the tab text is reset
// in MainWindow and the layout is updated, but it is also possible that the text is never
// touched after the insertion. Therefore, we need the following workaround.
if(!autoHide() && index == 0 && count() == 1) {
updateGeometry();
}
}
}
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