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Normal Topic ControlNode painting (Read 1504 times)
jscott
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ControlNode painting
Mar 25th, 2009 at 6:41am
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Hey,

I'm having a painting issue when embedding a .NET control within my diagram.

I have a ControlNode, set the Control property, and attach it to a ShapeNode in the diagram.
When moving the parent ShapeNode or scrolling/panning the view, the Control is receiving OnPaint events, but the parent ControlNode is not receiving a Draw (or if it is, it is ignoring it). This is creating artifacts during these operations. The .NET control is painting all over the view (which doesn't appear to get invalidated during a pan), or flickering during a move (the control is set to double buffer).

Is there something I've missed? I would not wish to implement my own versions of the .NET control types just to get rid of these artifacts...  Smiley

My test is using System.Windows.Forms.Button.

James
  
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Stoyo
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Re: ControlNode painting
Reply #1 - Mar 25th, 2009 at 8:12am
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Hi,

This happens because mouse messages in Windows have higher priority than repaint messages, and the button has its own WinForms window that can't get its turn to repaint itself. You could handle NodeModifying and call diagramView.Refresh() to force the view and all child hosted controls to repaint themselves, though that will slow down mouse input handling. Another option is to style a ShapeNode to look like a button and handle the NodeClicked event, instead of using real buttons.

I hope that helps,
Stoyan
  
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jscott
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Re: ControlNode painting
Reply #2 - Mar 26th, 2009 at 12:25am
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Yes, the ShapeNode approach will have to do.

Thanks,
James
  
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