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POResizing window causes black strips
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copied!<p>I have a form, which sets these styles in constructor:</p> <pre><code>this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); this.SetStyle(ControlStyles.UserPaint, true); this.SetStyle(ControlStyles.ResizeRedraw, true); this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true); </code></pre> <p>And I draw some rectangles in <code>Paint</code> event. There are no controls on the form. Hovewer, when I resize the form, there are black strips at right and bottom of the form. Is there any way to get rid of them? I've tried everything, listening for <code>WM_ERASEBKGND</code> in <code>WndProc</code>, manually drawing the form on <code>WM_PAINT</code>, implementing custom double buffer, etc. Is there anything else I could try?</p> <p>I've found this: <a href="https://connect.microsoft.com/VisualStudio/feedback/details/522441/custom-resizing-of-system-windows-window-flickers" rel="nofollow noreferrer">https://connect.microsoft.com/VisualStudio/feedback/details/522441/custom-resizing-of-system-windows-window-flickers</a> and it looks like it is a bug in DWM, but I just hope I can do some workaround.</p> <p>Please note that I must use double buffering, since I want to draw pretty intense graphic presentation in the <code>Paint</code> event. I develop in C# .NET 2.0, Win7.</p> <h2>Status Update 1</h2> <p>I've managed to get rid of most of the black stripes by implementing the resize functionality by myself. Hovewer there are still some minor glitches. Is there any way to do <code>resize</code> and <code>paint</code> operation at once? Here is a <strong>pseudo-code</strong> of what I need to do:</p> <pre><code>IntPtr hDC; var size = new Size(250, 200); IntPtr handle = API.PaintAndResizeBegin(this.Handle /* Form.Handle */, size.Width, size.Height, out hDC); using (var g = Graphics.FromHdc(hDC)) { this.backBuffer.Render(g, size); } API.PaintAndResizeCommit(handle); </code></pre> <p>Is there any way to implement the above code?</p> <p>The second solution could be to back-buffer whole form, including non-client area. But how to do that? I don't want to paint the non-client area by myself, as I want to keep the nice aero effect on Vista/7. Any help will be deeply appreciated.</p> <h2>Status Update 2</h2> <p>It looks like this problem is unsolvable, since it is omnipresent on Windows, in every application. We can just hope that MS will take some inspiration in Mac OS X and will provide appropriate APIs in new Windows.</p>

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