How to catch the ending resize window?

Question

I need catch the event endresize in WPF.

Answer 1

WPF doesn't provide an event that solely fires at the end of the resize process. SizeChanged is the only event associated with Window resizing - and it will fire multiple times during the resizing process.

A total hack would be to constantly set a timer ticking when the SizeChanged event fires. Then timer will not get a chance to tick until resizing ends and at that point do your one time processing.

public MyUserControl()
{
    _resizeTimer.Tick += _resizeTimer_Tick;
}

DispatcherTimer _resizeTimer = new DispatcherTimer { Interval = new TimeSpan(0, 0, 0, 0, 1500), IsEnabled = false };

private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)
{
    _resizeTimer.IsEnabled = true;
    _resizeTimer.Stop();
    _resizeTimer.Start();
}

void _resizeTimer_Tick(object sender, EventArgs e)
{
    _resizeTimer.IsEnabled = false;    

    //Do end of resize processing
}