CODEWITHSUNDEEP
c#.netwpfeventsevent-bubbling
Abhi
Abhi

Reputation: 5557

Event Bubbling in WPF Application

I'm new to WPF. In my WPF app, I have Windows which contain a user defined child control and that user defined child control again contains another user defined child control. Now from the inner most child control, on a button click, I want to fire events on all three controls (i.e. First Grand Child Control, Second Child Control, Third Main Control, and Window).

I know this can be achieved through delegates and Event Bubbling. Can you please tell me how?

Upvotes: 4

Views: 11689

Answers (3)

fixagon
fixagon

Reputation: 5566

Most important piece pf code for that: Add the event handlers on the static UIElement.MouseLeftButtonUpEvent:

middleInnerControl.AddHandler(UIElement.MouseLeftButtonUpEvent , new RoutedEventHandler(handleInner)); //adds the handler for a click event on the most out 
mostOuterControl.AddHandler(UIElement.MouseLeftButtonUpEvent , new RoutedEventHandler(handleMostOuter)); //adds the handler for a click event on the most out

The EventHandlers:

private void handleInner(object asd, RoutedEventArgs e)
    {
        InnerControl c = e.OriginalSource as InnerControl;
        if (c != null)
        {
            //do whatever
        }
        e.Handled = false; // do not set handle to true --> bubbles further
    }

private void handleMostOuter(object asd, RoutedEventArgs e)
    {
        InnerControl c = e.OriginalSource as InnerControl;
        if (c != null)
        {
            //do whatever
        }
        e.Handled = true; // set handled = true, it wont bubble further
    }

Upvotes: 6

Tom Squires
Tom Squires

Reputation: 9296

Have a look at this http://msdn.microsoft.com/en-us/library/ms742806.aspx

Upvotes: 2

Kent Boogaart
Kent Boogaart

Reputation: 178810

This page explains all about routed events, including how to implement and consume them.

Upvotes: 1

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