38 lines
1.1 KiB
C#
38 lines
1.1 KiB
C#
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namespace WPFluent.Extensions;
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internal static class UiElementExtensions
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{
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private static int Get_X_LParam(IntPtr lParam) { return (short)(lParam.ToInt32() & 0xFFFF); }
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private static int Get_Y_LParam(IntPtr lParam) { return (short)(lParam.ToInt32() >> 16); }
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/// <summary>
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/// Do not call it outside of NCHITTEST, NCLBUTTONUP, NCLBUTTONDOWN messages!
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/// </summary>
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/// <returns><see langword="true"/> if mouse is over the element. <see langword="false"/> otherwise.</returns>
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public static bool IsMouseOverElement(this UIElement element, IntPtr lParam)
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{
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// This method will be invoked very often and must be as simple as possible.
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if(lParam == IntPtr.Zero)
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{
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return false;
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}
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try
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{
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var mousePosScreen = new Point(Get_X_LParam(lParam), Get_Y_LParam(lParam));
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var bounds = new Rect(default, element.RenderSize);
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Point mousePosRelative = element.PointFromScreen(mousePosScreen);
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return bounds.Contains(mousePosRelative);
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} catch
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{
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return false;
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}
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}
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}
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