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//===========================================
// Lumina-DE source code
// Copyright (c) 2017, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
// This is a drag and drop capable version of the QTabBar
//===========================================
#ifndef _LUMINA_TEXT_EDITOR_DND_TABWIDGET_H
#define _LUMINA_TEXT_EDITOR_DND_TABWIDGET_H
#include <QTabBar>
#include <QTabWidget>
#include <QMouseEvent>
#include <QDebug>
#include <QDrag>
#include <QMimeData>
#include <QMenu>
#include <QAction>
class DnDTabBar : public QTabBar{
Q_OBJECT
signals:
void DetachTab(int); //
void DroppedIn(QStringList); //The full path of some file(s)
void DraggedOut(int, Qt::DropAction); //The tab number dragged/accepted by another app, and which action was accepted
private:
QMenu *tabMenu;
QString selTab;
private slots:
void slotDetachTab(){
//qDebug() << "Detach Tab:" << selTab;
int tab = tabMenu->whatsThis().toInt();
if(tab>=0){ emit DetachTab(tab); }
}
public:
DnDTabBar(QWidget *parent) : QTabBar(parent){
this->setAcceptDrops(true);
this->setMouseTracking(true);
tabMenu = new QMenu(this);
tabMenu->addAction(tr("Detach Tab"), this, SLOT(slotDetachTab()) );
}
~DnDTabBar(){
}
protected:
virtual void mousePressEvent(QMouseEvent *ev){
int tab = this->tabAt(ev->pos());
if(ev->button() == Qt::LeftButton && tab>=0){
selTab = this->tabWhatsThis(tab);
}
QTabBar::mousePressEvent(ev);
}
virtual void mouseMoveEvent(QMouseEvent *ev){
//qDebug() << "Got Move Event:" << this->geometry() << ev->pos();
QWidget *parent = this->parentWidget(); //top-level parent widget
while(parent->parentWidget()!=0 && !parent->isWindow()){ parent = parent->parentWidget(); }
if(selTab>=0 && !QRect(QPoint(0,0), parent->size()).contains( this->mapTo(parent, ev->pos())) ){
//qDebug() << "Got Mouse outside of parent:" << parent->geometry() << this->geometry() << this->mapTo(parent, ev->pos());
//if(ev->button()!=Qt::LeftButton){ QTabBar::mouseMoveEvent(ev); return; }
qDebug() << "Starting Drag:" << this->geometry() << ev->pos();
QString tab = selTab;
this->mouseReleaseEvent(new QMouseEvent(QEvent::MouseButtonRelease, ev->pos(), ev->button(), ev->buttons(), ev->modifiers()) ); //will reset selTab
//this->update();
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setUrls(QList<QUrl>() << QUrl::fromLocalFile(tab));
//qDebug() << "Start Drag:" << this->tabWhatsThis(tab);
drag->setMimeData(mimeData);
Qt::DropAction dropAction = drag->exec(Qt::MoveAction);
//Convert the tab->number and emit
for(int i=0; i<this->count(); i++){
if(this->tabWhatsThis(i) == tab){ this->emit DraggedOut(i, dropAction); this->setCurrentIndex(i); break; }
}
return;
}
QTabBar::mouseMoveEvent(ev);
}
virtual void mouseReleaseEvent(QMouseEvent *ev){
int tab = this->tabAt(ev->pos());
if(ev->button() == Qt::RightButton && tab>=0){
tabMenu->setWhatsThis(QString::number(tab));
tabMenu->popup(ev->globalPos());
}
selTab.clear(); //reset this flag - not in a drag right now
QTabBar::mouseReleaseEvent(ev);
}
virtual void dragEnterEvent(QDragEnterEvent *ev){
//qDebug() << "Got Drag Enter Event:" << ev->mimeData()->hasUrls();
if(ev->mimeData()->hasUrls() && ev->source()!=this){
ev->acceptProposedAction();
}
}
virtual void dragMoveEvent(QDragMoveEvent *ev){
//qDebug() << "Got Drag Move Event:" << ev->mimeData()->hasUrls();
if(ev->mimeData()->hasUrls() && ev->source()!=this){
ev->accept();
}
}
virtual void dropEvent(QDropEvent *ev){
//qDebug() << "Got Drop Event:" << ev->mimeData()->hasUrls();
if(ev->mimeData()->hasUrls() && ev->source()!=this){
QStringList files;
for(int i=0; i<ev->mimeData()->urls().length(); i++){
QString path = ev->mimeData()->urls().at(i).toLocalFile();
if(QFile::exists(path)){ files << path; }
}
//qDebug() << "[DROP] URLS:" << ev->mimeData()->urls() << "Files:" << files;
if(!files.isEmpty() && (ev->proposedAction()==Qt::CopyAction || ev->proposedAction()==Qt::MoveAction)){
ev->setDropAction(Qt::MoveAction);
ev->accept();
this->emit DroppedIn(files);
}
}
}
};
class DnDTabWidget : public QTabWidget{
Q_OBJECT
private:
DnDTabBar *TB;
public:
DnDTabWidget(QWidget *parent) : QTabWidget(parent){
TB = new DnDTabBar(this);
this->setTabBar(TB);
this->setTabsClosable(true);
this->setMovable(true);
}
~DnDTabWidget(){}
DnDTabBar* dndTabBar(){ return TB; }
};
#endif
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