Question

I have a qt application, window with several child widgets that are Qt::Tool windows.

When I minimize window and then restore on windows 7 child widgets appear immediately, but parent window not because of animation.

Is there any way to prevent this behavior and make child windows appear after main window?

Answer 1

Why don’t you hide the tool windows while the main window is restoring? You can use this piece of code and adapt it to your needs:

void MainWindow::changeEvent( QEvent* e )
{
  if ( e->type() == QEvent::WindowStateChange )
  {
    QWindowStateChangeEvent* event = 
        static_cast< QWindowStateChangeEvent* >( e );
    if ( event->oldState() & Qt::WindowMinimized ) {
      qDebug() << "The Window has been restored!";
    }
    else if ( (event->oldState() == Qt::WindowNoState) && 
              (this->windowState() == Qt::WindowMaximized) ) {
      qDebug() << "the window has been Maximized!";
    }
  }
}

For example, you can start a timer for a certain amount of time, and have the slot connected to your child tool windows, making them appear as you wish.

You can also play with transparency in the child tool windows, and emulate the main window effects.

As I recall, something like this will do:

setStyleSheet("background:transparent;");
setAttribute(Qt::WA_TranslucentBackground);
setWindowFlags(Qt::FramelessWindowHint);

Hope that helped!