✨ 增加可拖动到其它菜单功能 ⚡ 切换了icon动画

Util/DragAdorner.cs

@@ -0,0 +1,175 @@
+// Copyright (C) Josh Smith - January 2007
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Documents;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Shapes;
+using System.Windows.Media.Animation;
+using System.Windows.Controls;
+
+namespace GeekDesk.Util
+{
+	/// <summary>
+	/// Renders a visual which can follow the mouse cursor, 
+	/// such as during a drag-and-drop operation.
+	/// </summary>
+	public class DragAdorner : Adorner
+	{
+		#region Data
+
+		private Rectangle child = null;
+		private double offsetLeft = 0;
+		private double offsetTop = 0;
+
+		#endregion // Data
+
+		#region Constructor
+
+		/// <summary>
+		/// Initializes a new instance of DragVisualAdorner.
+		/// </summary>
+		/// <param name="adornedElement">The element being adorned.</param>
+		/// <param name="size">The size of the adorner.</param>
+		/// <param name="brush">A brush to with which to paint the adorner.</param>
+		public DragAdorner( UIElement adornedElement, Size size, Brush brush )
+			: base( adornedElement )
+		{
+			Rectangle rect = new Rectangle();
+			rect.Fill = brush;
+			rect.Width = size.Width;
+			rect.Height = size.Height;
+			rect.IsHitTestVisible = false;
+			this.child = rect;
+		}
+
+		#endregion // Constructor
+
+		#region Public Interface
+
+		#region GetDesiredTransform
+
+		/// <summary>
+		/// Override.
+		/// </summary>
+		/// <param name="transform"></param>
+		/// <returns></returns>
+		public override GeneralTransform GetDesiredTransform( GeneralTransform transform )
+		{
+			GeneralTransformGroup result = new GeneralTransformGroup();
+			result.Children.Add( base.GetDesiredTransform( transform ) );
+			result.Children.Add( new TranslateTransform( this.offsetLeft, this.offsetTop ) );
+			return result;
+		}
+
+		#endregion // GetDesiredTransform
+
+		#region OffsetLeft
+
+		/// <summary>
+		/// Gets/sets the horizontal offset of the adorner.
+		/// </summary>
+		public double OffsetLeft
+		{
+			get { return this.offsetLeft; }
+			set
+			{
+				this.offsetLeft = value;
+				UpdateLocation();
+			}
+		}
+
+		#endregion // OffsetLeft
+
+		#region SetOffsets
+
+		/// <summary>
+		/// Updates the location of the adorner in one atomic operation.
+		/// </summary>
+		/// <param name="left"></param>
+		/// <param name="top"></param>
+		public void SetOffsets( double left, double top )
+		{
+			this.offsetLeft = left;
+			this.offsetTop = top;
+			this.UpdateLocation();
+		}
+
+		#endregion // SetOffsets
+
+		#region OffsetTop
+
+		/// <summary>
+		/// Gets/sets the vertical offset of the adorner.
+		/// </summary>
+		public double OffsetTop
+		{
+			get { return this.offsetTop; }
+			set
+			{
+				this.offsetTop = value;
+				UpdateLocation();
+			}
+		}
+
+		#endregion // OffsetTop
+
+		#endregion // Public Interface
+
+		#region Protected Overrides
+
+		/// <summary>
+		/// Override.
+		/// </summary>
+		/// <param name="constraint"></param>
+		/// <returns></returns>
+		protected override Size MeasureOverride( Size constraint )
+		{
+			this.child.Measure( constraint );
+			return this.child.DesiredSize;
+		}
+
+		/// <summary>
+		/// Override.
+		/// </summary>
+		/// <param name="finalSize"></param>
+		/// <returns></returns>
+		protected override Size ArrangeOverride( Size finalSize )
+		{
+			this.child.Arrange( new Rect( finalSize ) );
+			return finalSize;
+		}
+
+		/// <summary>
+		/// Override.
+		/// </summary>
+		/// <param name="index"></param>
+		/// <returns></returns>
+		protected override Visual GetVisualChild( int index )
+		{
+			return this.child;
+		}
+
+		/// <summary>
+		/// Override.  Always returns 1.
+		/// </summary>
+		protected override int VisualChildrenCount
+		{
+			get { return 1; }
+		}
+
+		#endregion // Protected Overrides
+
+		#region Private Helpers
+
+		private void UpdateLocation()
+		{
+			AdornerLayer adornerLayer = this.Parent as AdornerLayer;
+			if( adornerLayer != null )
+				adornerLayer.Update( this.AdornedElement );
+		}
+
+		#endregion // Private Helpers
+	}
+}