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rajesh_patil74
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OnKeyDown override required
Dec 29th, 2010 at 6:09am
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Hi Stoyo

I am inheriting my custom class from Diagram class to provide some default functionalities.

One of the functionality required is on pressing delete key should delete the nodes for that
overriding the "OnKeyDown" or "OnKeyUp" functions doesn't get triggered.

Also, providig the following code doesn't help.
       public override void OnApplyTemplate()
       {
           base.OnApplyTemplate();
           this.AddHandler(UIElement.KeyUpEvent, new KeyEventHandler(OnKeyUp), true);
       }

Regards
Rajesh
  
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Stoyo
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Re: OnKeyDown override required
Reply #1 - Dec 29th, 2010 at 12:12pm
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Hi Rajesh,

Perhaps the diagram does not have the keyboard focus at that time. Try calling diagram.Focus() in response to MouseLeftButtonDown.

I hope that helps,
Stoyan
  
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rajesh_patil74
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Re: OnKeyDown override required
Reply #2 - Jan 3rd, 2011 at 1:24pm
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Hi Stoyo

Its not working. Focus is on diagram control.

What i did, selected the node and then pressed the delete key.

-Rajesh
  
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Stoyo
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Re: OnKeyDown override required
Reply #3 - Jan 4th, 2011 at 12:08pm
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This works for me:

Code
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public class DiagramEx : Diagram
{
	protected override void OnKeyUp(KeyEventArgs e)
	{
		base.OnKeyUp(e);
		if (e.Key == Key.Delete && ActiveItem != null)
			Items.Remove(ActiveItem);
	}

	protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
	{
		base.OnMouseLeftButtonUp(e);
		Focus();
	}
}


I hope that helps,
Stoyan
  
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