I have a QGLWidget as part of the UI of my application. It is NOT a central widget, there are a lot of others widgets around it. I want to show it full screen on user clicks the button. Similar functionality like on youtube video flash player.
I have tried to use showFullScreen with no effect.
I have read how-to-fullscreen-a-qglwidget and fullscreen-widget, but they suggest using showFullScreen.
Qt documentation states that for using showFullScreen widget must be an independent window. So I assume there should be some trick for this.
The solution I found:
void MyApp::on_fullscreen_button_clicked() {
QDialog *dlg = new QDialog(this);
QHBoxLayout *dlg_layout = new QHBoxLayout(dlg);
dlg_layout->setContentsMargins(0, 0, 0, 0);
dlg_layout->addWidget(glwidget_);
dlg->setLayout(dlg_layout);
dlg->showFullScreen();
bool r = connect(dlg, SIGNAL(rejected()), this, SLOT(showGlNormal()));
assert(r);
r = connect(dlg, SIGNAL(accepted()), this, SLOT(showGlNormal()));
assert(r);
}
void MyApp::showGlNormal() {
ui.glBox->layout()->addWidget(glwidget_);
}
The showFullScreen function works only on windows. From the Qt documentation:
A window is a widget that isn't visually the child of any other widget
and that usually has a frame and a window title.
A possible solution is the following:
When the user clicks the show full screen button
- Create a new QGlWidget with no parent and set to it the contents of you QGlWidget
- Use the showFullScreen function on it...
Maybe it is a better idea to subclass QGlWidget and pass in its constructor a pointer to another QGlWidget. The constructor should take the context of the provided widget and apply it to the new one.
- On your subclass catch keyboard events. When the user press Esc emit a signal
- In your base class catch this signal and connect it to a slot. In this slot hide the full screen QGlWidget and delete it.
