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Normal Topic How to lock updates on another thread? (Read 1594 times)
Necroman
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How to lock updates on another thread?
Nov 22nd, 2010 at 3:34pm
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Hi,
I got this problem - I use diagram initializer routine for creating and loading the Diagram object in background thread (it takes about 5 seconds, if it runs on UI thread - it freezes whole UI), unfortunately during this creation GDI methods are called and calling GDI in non-UI thread might cause exceptions. Is there a way how to disable drawing of objects on non-UI thread?

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at System.Drawing.Graphics.MeasureCharacterRanges(String text, Font font, RectangleF layoutRect, StringFormat stringFormat)
at MindFusion.Drawing.GdiGraphics.MeasureCharacterRanges(String text, Font font, RectangleF layoutRect, StringFormat stringFormat)
at MindFusion.Text.Word.UpdateMeasures(IGraphics graphics, Font font)
at MindFusion.Text.StyledText.StyledWord.UpdateMeasures(IGraphics graphics, Font font)
at MindFusion.Text.Text.Setup(String text, IGraphics graphics, Font font)
at MindFusion.Diagramming.TableNode.Cell.xd1bdd0ee5924b59e()
at MindFusion.Diagramming.TableNode.Cell.set_Text(String value)
at xy.Diagrams.DiagramDesigner.PaintRow(TableNode node, Int32 row, Guid projectItemID, xyobj obj)
at xy.Diagrams.DiagramDesigner.PaintList(TableNode node, xylist list)
...
-----
this is called on the top of callstack:
[DllImport("gdiplus.dll", CharSet=CharSet.Unicode, SetLastError=true, ExactSpelling=true)]
internal static extern int GdipGetStringFormatMeasurableCharacterRangeCount(HandleRef format, out int count);
-----
this is thrown
return new ArgumentException(SR.GetString("GdiplusInvalidParameter"));

Thanks Smiley
  
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Stoyo
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Re: How to lock updates on another thread?
Reply #1 - Nov 22nd, 2010 at 3:50pm
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Hi,

The diagram should not call drawing code when not shown inside a DiagramView, but perhaps the text measuring methods are always called when using styled text. You could try setting up the tables with EnableStyledTxt set to false, and enabling it from the main thread only after the background one exits.

I hope that helps,
Stoyan
  
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Necroman
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Re: How to lock updates on another thread?
Reply #2 - Nov 22nd, 2010 at 4:33pm
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It works! Smiley
Thanks a lot - I've disabled the EnableStyledTxt property when creating diagram in background thread and then enabled at the end in UI thread.
This might be probably mentioned somewhere in Documentation - possible problem in non-UI thread.
  
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