Question

Consider a QWidget, normally a child in some Layout.

Supposed I want to make it fullScreen for a while, then have it return to it’s old spot.

QWidget::setFullScreen() requires that the widget needs to be an independent window – any ideas how to work it out?

Answer 1

The simplest way I can see is to reparent to 0. Something like this:

#include <QApplication>
#include <QPushButton>

class MyButton : public QPushButton
{
public:
   MyButton(QWidget* parent) : QPushButton(parent) {}

   void mousePressEvent(QMouseEvent*) {
      this->setParent(0);
      this->showMaximized();
      this->show();
   }
};

int main(int argc, char *argv[])
{
   QApplication a(argc, argv);

   QWidget mainWidget;
   MyButton button(&mainWidget);
   mainWidget.show();

   return a.exec();
}