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public class Clip { public static bool GetToBounds(DependencyObject depObj) { return (bool)depObj.GetValue(ToBoundsProperty); } public static void SetToBounds(DependencyObject depObj,bool clipToBounds) { depObj.SETVALue(ToBoundsProperty,clipToBounds); } /// <sumMary> /// Identifies the ToBounds Dependency Property. /// <sumMary> public static readonly DependencyProperty ToBoundsProperty = DependencyProperty.RegisterAttached("ToBounds",typeof(bool),typeof(Clip),new PropertyMetadata(false,OnToBoundsPropertyChanged)); private static void OnToBoundsPropertyChanged(DependencyObject d,DependencyPropertyChangedEventArgs E) { FrameworkElement fe = d as FrameworkElement; if (fe != null) { ClipToBounds(fE); // whenever the element which this property is attached to is loaded // or re-sizes,we need to update its clipping geometry fe.Loaded += new RoutedEventHandler(fe_Loaded); fe.SizeChanged += new SizeChangedEventHandler(fe_SizeChanged); } } /// <sumMary> /// Creates a rectangular clipping geometry which matches the geometry of the /// passed element /// </sumMary> private static void ClipToBounds(FrameworkElement fE) { if (GetToBounds(fE)) { fe.Clip = new RectangleGeometry() { Rect = new Rect(0,fe.ActualWidth,fe.ActualHeight) }; } else { fe.Clip = null; } } static void fe_SizeChanged(object sender,SizeChangedEventArgs E) { ClipToBounds(sender as FrameworkElement); } static void fe_Loaded(object sender,RoutedEventArgs E) { ClipToBounds(sender as FrameworkElement); } }
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