QGraphicsScene with QGLWidget viewport is still active after closing window

[torsten]

Hello,

I have a problem with a QGraphicsScene, i want to use it in fullscreen mode. But if i use an QGLWidget as viewport, the screen stays black, even if the parent window is already closed. If i don't use the fullscreen, it works. I've wrote a little demoproject (source below) you can download "here":http://projects.ideaplexus.com/attachments/download/10/DemoProjekt.zip if you want to try it. I don't get the problem.

main.cpp
@#include "demodialog.h"

#include <QtGui/QApplication>
#include <QWidget>

int main( int argc, char* argv[] ) {
QApplication app( argc, argv );
DemoDialog *demoDialog = new DemoDialog();
demoDialog->show();
return app.exec();
}@

demodialog.h
@#ifndef DEMODIALOG_H
#define DEMODIALOG_H

#include <QDialog>
#include "graphicswidgetdialog.h"

class DemoDialog : public QDialog
{
Q_OBJECT
public:
explicit DemoDialog(QWidget *parent = 0);
~DemoDialog();

private:
GraphicsWidgetDialog *gwd;

private slots:
void normalDialog();
void fullDialog();
void closeDialog();
};

#endif // DEMODIALOG_H@

demodialog.cpp
@#include "demodialog.h"
#include <QHBoxLayout>
#include <QPushButton>

DemoDialog::DemoDialog(QWidget *parent) :
QDialog(parent)
{
gwd = new GraphicsWidgetDialog;
QPushButton *normal = new QPushButton(tr("normal"));
QPushButton *full = new QPushButton(tr("fullscreen"));
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(normal);
layout->addWidget(full);
setLayout(layout);
connect(normal,SIGNAL(clicked()),this,SLOT(normalDialog()));
connect(full,SIGNAL(clicked()),this,SLOT(fullDialog()));
connect(gwd,SIGNAL(closeDialog()),this,SLOT(closeDialog()));
}

DemoDialog::~DemoDialog() {
}

void DemoDialog::normalDialog() {
gwd->showNormal();
}

void DemoDialog::fullDialog() {
gwd->showFullScreen();
}

void DemoDialog::closeDialog() {
gwd->close();
}@

graphicswidgetdialog.h
@#ifndef GRAPHICSWIDGETDIALOG_H
#define GRAPHICSWIDGETDIALOG_H

#include <QDialog>
#include "graphicswidget.h"

class GraphicsWidgetDialog : public QDialog
{
Q_OBJECT
public:
explicit GraphicsWidgetDialog(QWidget *parent = 0);
~GraphicsWidgetDialog();

private:
GraphicsWidget *graphicsWidget;

signals:
void closeDialog();

private slots:
void keyPressEventSuccess();

};

#endif // GRAPHICSWIDGETDIALOG_H@

graphicswidgetdialog.cpp
@#include "graphicswidgetdialog.h"
#include <QHBoxLayout>

GraphicsWidgetDialog::GraphicsWidgetDialog(QWidget *parent) :
QDialog(parent)
{
graphicsWidget = new GraphicsWidget(this);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(graphicsWidget);
layout->setContentsMargins(0,0,0,0);
setLayout(layout);
connect(graphicsWidget,SIGNAL(keyPressEventSuccess()),this,SLOT(keyPressEventSuccess()));
}

GraphicsWidgetDialog::~GraphicsWidgetDialog() {
}

void GraphicsWidgetDialog::keyPressEventSuccess() {
emit closeDialog();
}@

graphicswidget.h
@#ifndef GRAPHICSWIDGET_H
#define GRAPHICSWIDGET_H

#include <QWidget>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QKeyEvent>

class GraphicsWidget : public QWidget
{
Q_OBJECT
public:
explicit GraphicsWidget(QWidget *parent = 0);
~GraphicsWidget();

private:
QGraphicsScene *scene;
QGraphicsView *view;
bool listenEvents;

protected:
void keyPressEvent(QKeyEvent *event);

signals:
void keyPressEventSuccess();
};

#endif // GRAPHICSWIDGET_H@

graphicswidget.cpp
@#include "graphicswidget.h"
#include <QGLWidget>
#include <QHBoxLayout>

GraphicsWidget::GraphicsWidget(QWidget *parent) :
QWidget(parent)
{
scene = new QGraphicsScene;
view = new QGraphicsView(scene);
view->setViewport(new QGLWidget(QGLFormat(QGL::DirectRendering)));
view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
view->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
view->setFrameStyle(QFrame::NoFrame);
view->setBackgroundBrush(Qt::black);
view->setRenderHints(QPainter::Antialiasing);
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(view);
layout->setContentsMargins(0,0,0,0);
setLayout(layout);
listenEvents=true;
grabKeyboard();
}

GraphicsWidget::~GraphicsWidget() {
}

void GraphicsWidget::keyPressEvent(QKeyEvent *event) {
if (listenEvents) {
switch (event->key()) {
case Qt::Key_F11:
emit keyPressEventSuccess();
break;
default:
QWidget::keyPressEvent(event);
}
} else {
QWidget::keyPressEvent(event);
}
}@

[iunknwn]

Memory leak at demoDialog.cpp:8:
gwd = new GraphicsWidgetDialog;
Change to:
gwd = new GraphicsWidgetDialog(this);

Problem solved.

[torsten]

Dammit, you don't believe how long i'm seaching for this... tanks

[torsten]

mmh, yesterday it works, but now it seems there is another problem. I've added some debug output and i found out, that GraphicsWidget in showFullScreen don't have focus/isactivewindow. so the problem exists