Custom Modal Window in WPF?
- by Dan Bryant
I have a WPF application where I'd like to create a custom pop-up that has modal behavior. I've been able to hack up a solution using an equivalent to 'DoEvents', but is there a better way to do this? Here is what I have currently:
private void ShowModalHost(FrameworkElement element)
{
//Create new modal host
var host = new ModalHost(element);
//Lock out UI with blur
WindowSurface.Effect = new BlurEffect();
ModalSurface.IsHitTestVisible = true;
//Display control in modal surface
ModalSurface.Children.Add(host);
//Block until ModalHost is done
while (ModalSurface.IsHitTestVisible)
{
DoEvents();
}
}
private void DoEvents()
{
var frame = new DispatcherFrame();
Dispatcher.BeginInvoke(DispatcherPriority.Background,
new DispatcherOperationCallback(ExitFrame), frame);
Dispatcher.PushFrame(frame);
}
private object ExitFrame(object f)
{
((DispatcherFrame)f).Continue = false;
return null;
}
public void CloseModal()
{
//Remove any controls from the modal surface and make UI available again
ModalSurface.Children.Clear();
ModalSurface.IsHitTestVisible = false;
WindowSurface.Effect = null;
}
Where my ModalHost is a user control designed to host another element with animation and other support.
