更新

WPFDark/Internals/FrameworkElementExtensions.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Windows;
+using System.Windows.Media;
+
+namespace WPFDark.Internals
+{
+    internal static class FrameworkElementExtensions
+    {
+        internal const double BorderWidth = 1.0;
+        internal const double BorderHalfWidth = BorderWidth * 0.5;
+        
+        internal static double CalcCompositeRenderScale(this FrameworkElement self)
+        {
+            var scale = 1.0;
+
+            var p = self as DependencyObject;
+
+            do
+            {
+                if (p is FrameworkElement pp)
+                {
+                    switch (pp.RenderTransform)
+                    {
+                        case TransformGroup tg:
+                        {
+                            foreach (var c in tg.Children)
+                            {
+                                if (!(c is ScaleTransform sc))
+                                    continue;
+
+                                scale *= sc.ScaleX;
+                            }
+
+                            break;
+                        }
+
+                        case ScaleTransform st:
+                            scale *= st.ScaleX;
+                            break;
+                    }
+                }
+
+                p = VisualTreeHelper.GetParent(p);
+            } while (p != null);
+
+            return scale;
+        }
+
+        internal static void SetMouseClipping(this FrameworkElement self)
+        {
+            var p0 = new Point(0, 0);
+            var p1 = new Point(self.ActualWidth + 1, self.ActualHeight + 1);
+            var dp0 = self.PointToScreen(p0);
+            var dp1 = self.PointToScreen(p1);
+            var cr = new Win32Helper.RECT((int) dp0.X, (int) dp0.Y, (int) dp1.X, (int) dp1.Y);
+            Win32Helper.ClipCursor(ref cr);
+        }
+
+        internal static void ResetMouseClipping(this FrameworkElement self)
+        {
+            Win32Helper.ClipCursor(IntPtr.Zero);
+        }
+
+        internal static bool IsInActualSize(this FrameworkElement self, Point pos)
+        {
+            return pos.X >= 0 && pos.X <= self.ActualWidth &&
+                   pos.Y >= 0 && pos.Y <= self.ActualHeight;
+        }
+    }
+}