Is there a way to double buffer TreeView if I am drawing the nodes?

[David Thielen]

I erase the background and then render the requested node(s) in my
DrawNode handler. This causes it to flicker. Is there a way to tell it
to double buffer?

Control.DoubleBuffer is ignored for TreeView. This is an issue even
when not updating it, when I expand/contract or resize the window.

thanks - dave

***@at-at-***@windward.dot.dot.net
Windward Reports -- http://www.WindwardReports.com
me -- http://dave.thielen.com

Cubicle Wars - http://www.windwardreports.com/film.htm

[Zhi-Xin Ye [MSFT]]

Hi Dave,

You can try preventing the TreeView from erasing its background like
follows, this approach would avoid the flicker.

public class MyTreeView : TreeView
{
private const int WM_ERASEBKGND = 0x0014;

protected override void WndProc(ref Message msg)
{
if (msg.Msg == WM_ERASEBKGND)
{
return;
}
base.WndProc(ref msg);
}
}

Please try my suggestion and let me know wether it make sense to you.

Have a nice day!

Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team

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[David Thielen]

Post by Zhi-Xin Ye [MSFT]
Hi Dave,
You can try preventing the TreeView from erasing its background like
follows, this approach would avoid the flicker.
public class MyTreeView : TreeView
{
private const int WM_ERASEBKGND = 0x0014;
protected override void WndProc(ref Message msg)
{
if (msg.Msg == WM_ERASEBKGND)
{
return;
}
base.WndProc(ref msg);
}
}
Please try my suggestion and let me know wether it make sense to you.

That did it - thanks - dave


***@at-at-***@windward.dot.dot.net
Windward Reports -- http://www.WindwardReports.com
me -- http://dave.thielen.com

Cubicle Wars - http://www.windwardreports.com/film.htm

[David Thielen]

This post might be inappropriate. Click to display it.

[Zhi-Xin Ye [MSFT]]

Hi Dave,

The Graphics class does not have a DoubleBuffer property. You can just draw
what you want in the DrawNode event handler using the Graphics object.

If you have any questions or concerns, please feel free to let me know.

Best Regards,
Zhi-Xin Ye
Microsoft Online Support Team

[Zhi-Xin Ye [MSFT]]

Hi Dave,

How is the problem now? Do you still need help on it? If you have any
questions or concerns, please feel free to let me know.

Best Regards,
Zhi-Xin Ye
Microsoft Online Support Team

[Chris Madsen]

TreeView has BeginUpdate and EndUpdate that handles this for me just fine in
VB.NET 2005.

Chris

Post by David Thielen
I erase the background and then render the requested node(s) in my
DrawNode handler. This causes it to flicker. Is there a way to tell it
to double buffer?
Control.DoubleBuffer is ignored for TreeView. This is an issue even
when not updating it, when I expand/contract or resize the window.
thanks - dave
Windward Reports -- http://www.WindwardReports.com
me -- http://dave.thielen.com
Cubicle Wars - http://www.windwardreports.com/film.htm