WPF intercept clicks outside a modal window

Question

Is it possible to check when the user has clicked outside a modal window? I\'d like to somehow circumvent the modal logic because if the window isn\'t displayed as modal, it wil

Answer 1

Even if it's a modal window (displayed with ShowDialog() calls), one can add some even handlers to the window's class and make it check for the mouse clicks outside the window like this:

    private void Window_MouseDown(object sender, MouseButtonEventArgs e)
    {
        if (posX < 0 || posX > this.Width || posY < 0 || posY > this.Height)
            this.Close();            
    }

    private void Window_MouseMove(object sender, MouseEventArgs e)
    {
        Point p = e.GetPosition(this);

        posX = p.X; // private double posX is a class member
        posY = p.Y; // private double posY is a class member
    }

    private void Window_Activated(object sender, EventArgs e)
    {
        System.Windows.Input.Mouse.Capture(this, System.Windows.Input.CaptureMode.SubTree);
    }

This did the job for me, in a difficult context: mingled MFC, WindowsForms mammoth of an app - no interop, no other complicated stuff. Hope it helps others facing this odd behavior.

Answer 2

Well one way is to hook up the event handler on your main app and respond to it when you have that window open:

EventManager.RegisterClassHandler(typeof(Window), Mouse.MouseDownEvent, new MouseButtonEventHandler(OnMousepDown), true);

or

  EventManager.RegisterClassHandler(typeof(yourAppClassName),   Mouse.PreviewMouseDownEvent, new MouseButtonEventHandler(OnMousepDown), true);

//this is just a sample..
private void OnMousepDown(object sender, MouseButtonEventArgs e)
    {
        if (thatWindowThatYourTalkingAbout.IsOpen) 
            ..do something 
    }