72 lines
2.4 KiB
C#
72 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Documents;
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using System.Windows.Media;
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namespace Deedy.Activity
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{
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public class DragPlacementAdorner : Adorner
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{
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private static readonly Pen _PrevPen;
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private static readonly Pen _NextPen;
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private static readonly Pen _PartPen;
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public Dock? Position { get; private set; }
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static DragPlacementAdorner()
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{
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// 定义装饰器的画笔
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_PrevPen = new Pen(Brushes.Red, 5.0);
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_PrevPen.Freeze();
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_NextPen = new Pen(Brushes.Red, 5.0);
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_NextPen.Freeze();
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_PartPen = new Pen(Brushes.Blue, 3.0);
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_PartPen.Freeze();
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}
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public DragPlacementAdorner(UIElement adornedElement, Dock? dock) : base(adornedElement)
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{
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this.Position = dock;
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IsHitTestVisible = false;
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}
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protected override void OnRender(DrawingContext drawingContext)
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{
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var adornedElementRect = new Rect(AdornedElement.RenderSize);
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// 根据位置信息绘制不同的视觉效果
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switch (this.Position)
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{
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case Dock.Top:
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drawingContext.DrawLine(_PrevPen,
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new Point(0, 0),
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new Point(adornedElementRect.Right, 0));
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break;
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case Dock.Bottom:
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drawingContext.DrawLine(_NextPen,
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new Point(0, adornedElementRect.Bottom),
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new Point(adornedElementRect.Right, adornedElementRect.Bottom));
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break;
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case Dock.Left:
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drawingContext.DrawLine(_PrevPen,
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new Point(0, 0),
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new Point(0, adornedElementRect.Bottom));
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break;
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case Dock.Right:
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drawingContext.DrawLine(_NextPen,
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new Point(adornedElementRect.Right, 0),
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new Point(adornedElementRect.Right, adornedElementRect.Bottom));
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break;
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case null:
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drawingContext.DrawRectangle(null, _PartPen, adornedElementRect);
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break;
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default: break;
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}
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}
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}
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}
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