原文:

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Vblegend_2013/article/details/83447420

源码已封装成 MirrorGrid类 可以直接在XAML里添加

根据需要可以把Grid 改为  button border等控件

注意 Target必须为当前控件下层的控件对象

 

加个BlurEffect就是毛玻璃效果

 

using System.Windows;using System.Windows.Controls;using System.Windows.Media;namespace WpfApp2{    /// 
    /// 镜像格子    /// 
    public class MirrorGrid : Grid    {        /// 
        /// 目标对象        /// 
        public FrameworkElement Target        {            get { return (FrameworkElement)GetValue(TargetProperty); }            set { SetValue(TargetProperty, value); }        }        /// 
        /// 目标对象属性        /// 
        public static readonly DependencyProperty TargetProperty =        DependencyProperty.Register("Target", typeof(FrameworkElement), typeof(MirrorGrid),        new FrameworkPropertyMetadata(null));        /// 
        /// 重写基类 Margin        /// 
        public new Thickness Margin        {            get { return (Thickness)GetValue(MarginProperty); }            set { SetValue(MarginProperty, value); }        }        public new static readonly DependencyProperty MarginProperty = DependencyProperty.Register("Margin", typeof(Thickness), typeof(MirrorGrid), new FrameworkPropertyMetadata(new Thickness(0), new PropertyChangedCallback(OnMarginChanged)));        private static void OnMarginChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)        {            ((FrameworkElement)target).Margin = (Thickness)e.NewValue;            //强制渲染            ((FrameworkElement)target).InvalidateVisual();        }        protected override void OnRender(DrawingContext dc)        {            var Rect = new Rect(0, 0, RenderSize.Width, RenderSize.Height);            if (Target == null)            {                dc.DrawRectangle(this.Background, null, Rect);            }            else            {                this.DrawImage(dc, Rect);            }        }        private void DrawImage(DrawingContext dc, Rect rect)        {            VisualBrush brush = new VisualBrush(Target)            {                Stretch = Stretch.Fill,            };            var tl = this.GetElementLocation(Target);            var sl = this.GetElementLocation(this);            var lx = (sl.X - tl.X) / Target.ActualWidth;            var ly = (sl.Y - tl.Y) / Target.ActualHeight;            var pw = this.ActualWidth / Target.ActualWidth;            var ph = this.ActualHeight / Target.ActualHeight;            brush.Viewbox = new Rect(lx, ly, pw, ph);            dc.DrawRectangle(brush, null, rect);        }        /// 
        /// 获取控件元素在窗口的实际位置        /// 
        ///         /// 
                public Point GetElementLocation(FrameworkElement Control)        {            Point location = new Point(0, 0);            FrameworkElement element = Control;            while (element != null)            {                var Offset = VisualTreeHelper.GetOffset(element);                location = location + Offset;                element = (FrameworkElement)VisualTreeHelper.GetParent(element);            }            return location;        }    }}

 

测试源码

 

后台

using System.Windows;using System.Windows.Input;namespace WpfApp2{    /// 
    /// Window1.xaml 的交互逻辑    /// 
    public partial class Window1 : Window    {        public Window1()        {            InitializeComponent();        }        private bool isDragging;        private Point clickPosition;        private void thumb_MouseDown(object sender, MouseButtonEventArgs e)        {            isDragging = true;            var draggableElement = sender as UIElement;            clickPosition = e.GetPosition(this);            draggableElement.CaptureMouse();        }        private void thumb_MouseUp(object sender, MouseButtonEventArgs e)        {            isDragging = false;            var draggableElement = sender as UIElement;            draggableElement.ReleaseMouseCapture();        }        private void thumb_MouseMove(object sender, MouseEventArgs e)        {            var draggableElement = sender as UIElement;            if (isDragging && draggableElement != null)            {                Point currentPosition = e.GetPosition(this.Parent as UIElement);                Thickness s = new Thickness(thumb.Margin.Left + currentPosition.X - clickPosition.X, thumb.Margin.Top + currentPosition.Y - clickPosition.Y,0,0);                thumb.Margin = s;                clickPosition = currentPosition;            }        }    }}