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Normal Topic Link being drawn after handling Node ExpandButtonC (Read 2169 times)
ToddGreve
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Link being drawn after handling Node ExpandButtonC
Aug 26th, 2010 at 2:40am
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I have an event handler associated with the ExpandButtonClicked event on my diagram. Within this handler if the node is expanded I am posting a call to a web service which returns to me the nodes to display below this one.
When this has finished executing I am now finding the diagram is attempting to draw a link from the node I was expanding and following the cursor around on the canvas.
Any idea either why this is happening, or how I can either prevent this happening, or force the diagram to stop drawing a link if it is being drawn?
The other piece of information to add is that as the retrieve may be delayed in returning, I am configuring a BusyIndicator to show in the ExpandButtonClicked handler. Only when this indicator is shown does the bizarre behaviour appear.
I appreciate any thoughts or suggestions you may have
Thanks
Todd
  
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Stoyo
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Re: Link being drawn after handling Node ExpandBut
Reply #1 - Aug 26th, 2010 at 8:10am
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BusyIndicator might be stealing the mouse capture which the diagram sets upon mouse-down, and then it misses the mouse-up event and remains in drawing state. Some things you might try are:

- call diagram.CaptureMouse after showing the indicator
- set Behavior = DoNothing and reset it back when the request is handled
- call CancelDrag from LinkCreating if the indicator is currently visible

I hope that helps,
Stoyan
  
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ToddGreve
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Re: Link being drawn after handling Node ExpandBut
Reply #2 - Aug 27th, 2010 at 6:08am
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Thanks for the suggestions Stoyo. I tried each and unfortunately none worked. I even tried all together. At this point I have disabled the busyIndicator and things appear to be working ok. I will run some more timing tests in the Cloud to make sure things are running quicker than in the local dev environment and perhaps not needing the busy indicator.
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Todd
  
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Stoyo
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Re: Link being drawn after handling Node ExpandBut
Reply #3 - Aug 27th, 2010 at 3:10pm
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I've tried that with the code below but couldn't reproduce a link to draw after clicking the expand button. The Diagram and BusyIndicator are placed in the same cell of a Grid panel.

Code
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private void OnExpandButtonClicked(object sender, MindFusion.Diagramming.Silverlight.NodeEventArgs e)
{
	busyIndicator.IsBusy = true;

	var t = new DispatcherTimer();
	t.Interval = TimeSpan.FromSeconds(3);
	t.Tick += new EventHandler(t_Tick);
	t.Start();
}

void t_Tick(object sender, EventArgs e)
{
	busyIndicator.IsBusy = false;
	var t = (DispatcherTimer)sender;
	t.Stop();
}


Could you email a sample project that shows the problem to support@mindfusion.eu?

Stoyan
  
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