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Normal Topic Captureing Mouseinput on UIElement (Read 3049 times)
Paul Eden
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Captureing Mouseinput on UIElement
Nov 13th, 2008 at 3:24pm
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Hi

We have some scenarios where mouse inputs need to be handled differently, sometimes the input needs to be captured at the node level, and for this we use the CaptureMouse() method. Is there an 'opposite' of this where the mouse input will be forced through the node to the underlying UIElement?

Many thanks


Paul Eden
  
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Stoyo
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Re: Captureing Mouseinput on UIElement
Reply #1 - Nov 13th, 2008 at 3:55pm
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Hi,

Have you tried with node.Locked = true?

Stoyan
  
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Paul Eden
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Re: Captureing Mouseinput on UIElement
Reply #2 - Nov 24th, 2008 at 11:35am
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Hi Stoyan

This may be due to the age of our DLLs, but when I set thenodes lock state to true, the mouse input does get through to the UIElement, but it also seems to pass right through the node to the underlying Diagram canvas.  As an example, if the UIElement has a scrollbar in it, attempting to drag the scrollbar will normally move the node at the same time.  Setting the Locked property to true, allows the scrollbar to be move, but also starts to draw a new instance of the diagrams default shape.
Is this expected behaviour, or something that has since been fixed?

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Paul
  
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Re: Captureing Mouseinput on UIElement
Reply #3 - Nov 24th, 2008 at 12:34pm
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Hi Paul,

The Diagram control starts drawing an item in its PreviewMouseDown handler, which is raised before PreviewMouseDown of child controls. So you might handle this event in your control like this:

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void UIElement_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
	if (diagram.Interaction != null)
		diagram.Interaction.CancelNow();
}


This will let you select and move the control node, but will stop the diagram from drawing new items when the mouse is over the hosted control.

I hope that helps,
Stoyan
  
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