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Normal Topic Overview exception (Read 1228 times)
DConroy
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Overview exception
Apr 19th, 2007 at 1:49pm
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Hi...

I've got an issue where I've got an overview control that serves many flowcharts.

As each flowchart is activated, the document of the overview is changed to the current overview.

If no flowcharts are open, overview.document is set to null.

If the document is not null, there's no problems.  But if it is and the user clicks on the control and drags the mouse to the edge of the control, an unhandled exception occurs.

Anyone have any ideas?
  
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Stoyo
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Re: Overview exception
Reply #1 - Apr 19th, 2007 at 4:36pm
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Hi,

The overview does not provide for a null Document, so you might create a temporary empty chart and assign it to the overview instead of null. E.g.

if (no flowcharts are open)
  ovw.Document = new FlowChart();

You might set the temporary chart's background to gray to indicate that this isn't an actual flowchart.

Stoyan
  
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