32.29 Is there a way to halt a screen from painting until all the controls on the form are initialized? |
Shawn Burke responded to this question in a posting on microsoft.public.dotnet.framework.windowsforms newsgroup. There is not currently a way to do this built into the framework, but WM_SETREDRAW will do what you're looking for. It can't be called recursively, so here's code for a property you can add to your form to handle it. A VB sample is also available. |
| int paintFrozen;
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| private const int WM_SETREDRAW = 0xB;
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| [DllImport("User32")]
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| private static extern bool SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
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| private bool FreezePainting
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| {
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| get { return paintFrozen > 0; }
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| set {
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| if (value && IsHandleCreated && this.Visible)
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| {
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| if (0 == paintFrozen++)
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| {
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| SendMessage(Handle, WM_SETREDRAW, 0, 0);
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| }
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| }
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| if (!value)
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| {
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| if (paintFrozen == 0)
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| {
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| return;
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| }
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| if (0 == --paintFrozen)
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| {
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| SendMessage(Handle, WM_SETREDRAW, 1, 0);
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| Invalidate(true);
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| }
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| }
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| }
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| } |
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