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.NET Forum / Windows Forms / WinForm General / April 2005Treeview Flickering
Hi, My treeview is flickering whenever I change the text property of a node. I was searching the newsgroups on how to resolve this problem, and found the following solution: Inherited from a treeview and added the following code to its constructor: this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer | ControlStyles.ResizeRedraw, true ); However, when I try this nothing at all is drawn! What am i missing? I am using C#.NET with VS2003 Thanks for helping me out! Tomas I would suggest to modify properties in steps. And would start from AllPainting and DoubleBuffer only. Another thing is - you can try to use treeview.BeginUpdate/EndUpdate calls around your updating code, which will prevent internal redraws. HTH Alex > Hi, > [quoted text clipped - 12 lines] > Thanks for helping me out! > Tomas I tried to modify the properties in steps, and saw it was ControlStyles.Userpaint that causes the trouble. However, when I remove this, the treeview still has the annoying flickering, so this doesn't solve my problem. Adding Begin/Endupdate doesn't change anything either. :( > I would suggest to modify properties in steps. And would start from > AllPainting and DoubleBuffer only. [quoted text clipped - 21 lines] > > Thanks for helping me out! > > Tomas Tomas, treeview will flicker always on every update. It's I think by design. If some node is changed treeview has to go through all visible part of the tree at least to redraw properly. If you update only one node - I don't know if somebody (except maybe MS?) will help you. However, if you update several nodes - Begin/EndUpdate definitely will reduce multiple flickers to single one. HTH Alex > I tried to modify the properties in steps, and saw it was > ControlStyles.Userpaint that causes the trouble. [quoted text clipped - 28 lines] > > > Thanks for helping me out! > > > Tomas Hmm, I only update one node (2 at max) Text property at a time. It's weird all the other nodes are flickering too. > Tomas, > [quoted text clipped - 44 lines] > > > > Thanks for helping me out! > > > > Tomas i had a similar problem and how i solved that (partially) is by preventing the control from erasing its background. this is the code to do it protected override void WndProc(ref Message messg) // turn the erase background message into a null message if ((int)0x0014 == messg.Msg) //if message is is erase background { messg.Msg = (int) 0x0000; //reset message to null } base.WndProc(messg); } > Hmm, > I only update one node (2 at max) Text property at a time. [quoted text clipped - 49 lines] > > > > > Thanks for helping me out! > > > > > Tomas Use the BeginUpdate() and EndUpdate() methods to encapsulate the code you're using to update the text in the node. I've just used that solution recently while developing an inherited Treeview Control.
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