the big ben | Bonjour,
Je modifie l'affichage du composant TreeView et, pour ce, j'ai trouvé un code sur le net permettant d'implémenter l'evennement paint qui n'existe pas par défaut.
Le problème c'est que j'ai quelque bugs graphiques lorsque j'utilise les ascenseurs j'ai l'impression qu'il utilise un buffer et que du coups il ne demmande pas le toujours le repaint quand je remonte avec un ascenseur!
J'aimerais donc réduir la taille de ce buffer pour éviter ce bug qui ne semble arriver que sur les éléments déja étendu et que quand je remonte.
Voici le code en question:
Je suppose que les éléments à modifier se trouvent pres des ligne 73 et 88 mais pour y mettre quoi???
Code :
- using System;
- using System.Drawing;
- using System.Drawing.Drawing2D;
- using System.Windows.Forms;
- using System.ComponentModel;
- namespace NewControls {
- /// <summary>
- /// Displays a hierarchical collection of labeled items, each represented by a System.Windows.Forms.TreeNode.
- /// </summary>
- [
- //Use the same attibutes as TreeView
- DesignerAttribute("System.Windows.Forms.Design.TreeViewDesigner, System.Design, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" ),
- DefaultPropertyAttribute("Nodes" ),
- DefaultEventAttribute("AfterSelect" )
- ]
- public class TreeViewWithPaint :TreeView {
- Bitmap internalBitmap = null;
- Graphics internalGraphics = null;
- private void DisposeInternal() {
- if( internalGraphics != null )
- internalGraphics.Dispose();
- if( internalBitmap != null )
- internalBitmap.Dispose();
- }
- /// <summary>Releases resources.</summary>
- /// <param name="disposing">true = Both managed and unmanaged, false = Unmanaged only.</param>
- protected override void Dispose(bool disposing) {
- if( disposing )
- DisposeInternal();
- base.Dispose (disposing);
- }
- /// <summary>Occurs when window is resized.</summary>
- /// <param name="e">A System.EventArgs.Empty.</param>
- /// <remarks>Recreates internal Graphics object. </remarks>
- protected override void OnResize( System.EventArgs e ) {
- if( internalBitmap == null ||
- internalBitmap.Width != Width || internalBitmap.Height != Height ) {
- if( Width != 0 && Height != 0 ) {
- DisposeInternal();
- internalBitmap = new Bitmap( Width, Height );
- internalGraphics = Graphics.FromImage( internalBitmap );
- }
- }
- }
- /// <summary>Occurs when a Windows message is dispatched.</summary>
- /// <param name="message">Message to process.</param>
- /// <remarks>Overrides WM_PAINT, WM_ERASEBKGND.</remarks>
- protected override void WndProc(ref Message message) {
- const int WM_PAINT = 0x000F;
- const int WM_PRINTCLIENT = 0x0318;
- const int WM_ERASEBKGND = 0x0014;
- switch( message.Msg ) {
- case WM_ERASEBKGND:
- //removes flicker
- return;
- case WM_PAINT:
- // The designer host does not call OnResize()
- if( internalGraphics == null )
- OnResize( EventArgs.Empty );
- //Set up
- Win32.RECT updateRect = new Win32.RECT();
- if( Win32.GetUpdateRect( message.HWnd, ref updateRect, false) == 0 )
- break;
- Win32.PAINTSTRUCT paintStruct = new Win32.PAINTSTRUCT();
- IntPtr screenHdc = Win32.BeginPaint(message.HWnd, ref paintStruct);
- using( Graphics screenGraphics = Graphics.FromHdc( screenHdc ) ) {
- //Draw Internal Graphics
- IntPtr hdc = internalGraphics.GetHdc();
- Message printClientMessage = Message.Create( Handle, WM_PRINTCLIENT, hdc, IntPtr.Zero );
- DefWndProc( ref printClientMessage );
- internalGraphics.ReleaseHdc( hdc );
- //Add the missing OnPaint() call
- OnPaint( new PaintEventArgs( internalGraphics, Rectangle.FromLTRB(
- updateRect.left,
- updateRect.top,
- updateRect.right,
- updateRect.bottom ) ) );
- //Draw Screen Graphics
- screenGraphics.DrawImage( internalBitmap, 0, 0 );
- }
- //Tear down
- Win32.EndPaint( message.HWnd, ref paintStruct );
- return;
- }
- base.WndProc(ref message);
- }
- /// <summary>Occurs when the control is redrawn.</summary>
- /// <remarks>Re enable browsing attributes for the Paint Event.</remarks>
- [
- EditorBrowsableAttribute( EditorBrowsableState.Always ),
- BrowsableAttribute(true)
- ]
- public new event PaintEventHandler Paint {
- add { base.Paint += value; }
- remove{ base.Paint -= value; }
- }
- }
- }
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Message édité par the big ben le 07-06-2006 à 16:23:38
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