47 lines
1.2 KiB
C#
47 lines
1.2 KiB
C#
namespace Pilz.UI.WinForms.Utilities;
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public static class DrawingControl
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{
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private const int WM_SETREDRAW = 11;
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private readonly static Dictionary<nint, int> dicSuspendCount = [];
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public static void SuspendDrawing(this Control control)
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{
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if (!dicSuspendCount.ContainsKey(control.Handle))
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dicSuspendCount.Add(control.Handle, 1);
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else
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{
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dicSuspendCount[control.Handle] += 1;
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}
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if (dicSuspendCount[control.Handle] == 1)
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User32Bridge.SendMessage(control.Handle, WM_SETREDRAW, false, 0);
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}
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public static void ResumeDrawing(this Control control)
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{
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control.ResumeDrawing(true);
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}
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public static void ResumeDrawing(this Control control, bool redraw)
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{
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var doRedraw = true;
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if (dicSuspendCount.ContainsKey(control.Handle))
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{
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dicSuspendCount[control.Handle] -= 1;
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if (dicSuspendCount[control.Handle] >= 1)
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doRedraw = false;
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}
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if (doRedraw)
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{
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User32Bridge.SendMessage(control.Handle, WM_SETREDRAW, true, 0);
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if (redraw)
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control.Refresh();
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}
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}
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} |