107 lines
4.8 KiB
C#
107 lines
4.8 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.Runtime.CompilerServices;
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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 Future.Contract
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{
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/// <summary>
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/// 拖动辅助装饰器
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/// </summary>
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public class DragDropAdorner : Adorner
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{
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#region 静态变量区
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private static DragDropAdorner sAdorner; //装饰器：拖放过程中所有效果绘制使用的装饰器对象，结束后会释放
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private static AdornerLayer sLayer; //装饰层：用于放置拖放效果装饰器，拖放过程结束后会清除对象引用
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private static UIElement sOrigin; //拖起目标：被拖动的源对象
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private static UIElement sTarget; //放置目标：在拖动过程中用于放置拖动源的目标，随拖动过程而变化
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private static Canvas sCanvas; //拖放画布：整个拖放过程的完整区域，是拖起目标与放置目标的祖辈
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private static Border sShadow; //鼠标拖起阴影：用于将托起目标尺寸按照相同缩放比缩放后变成阴影
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private static Canvas sEffect; //鼠标拖动效果：用于提示放置的参考点位置，左、上、右、下，中。
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private static Dock sPosition; //参考放置位置：为放置目标的位置提供参考，左、上、右、下，中。
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/// <summary>
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/// 放置的参考点
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/// </summary>
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public static Dock DropPosition { get => sPosition; }
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#endregion
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#region 静态方法区
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/// <summary>
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/// 设定完整拖放效果区域以及被拖动的对象，或是等效对象来起动拖放事件
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/// </summary>
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/// <param name="area">完整的拖放区域，必须是拖起目标与放置目标的共同祖先节点</param>
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/// <param name="origin">被拖动的可视化目标，或是其等效目标</param>
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/// <returns></returns>
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public static DragDropEffects DoDragDrop(UIElement area, UIElement dragSource, object data, DragDropEffects allowedEffects)
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{
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DragDropEffects dragDropEffects = allowedEffects;
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//TODO：准备拖放，生成阴影，监听拖动执行区域中的拖动事件
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dragDropEffects = DragDrop.DoDragDrop(dragSource, data, dragDropEffects);
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//TODO：拖拽操作完成，释放装饰器以及过程中使用的所有资源
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sLayer.Remove(sAdorner);
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return dragDropEffects;
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}
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private static void OnDragEnter(UIElement target, DragEventArgs args)
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{
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sTarget= target;
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target.MouseMove += Target_MouseMove;
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//TODO：更换目标对象，监听目标对象的鼠标事件，规制“阴影”与“效果”
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}
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private static void Target_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
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{
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//TODO：计算鼠标位置，移动效果与阴影
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}
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//public static void OnDragOver(UIElement target, DragEventArgs args)
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//{
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// //TODO：计算鼠标位置，移动效果与阴影
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//}
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public static void OnDragLeave(UIElement target, DragEventArgs args)
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{
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//TODO：清除目标对象，清除对鼠标事件的监听，清除“阴影”与“效果”
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target.MouseMove -= Target_MouseMove;
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}
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public static void DropCompleted(UIElement target, DragEventArgs args)
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{
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//TODO：清除静态存储区中所使用过的数据，清除装饰器
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}
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#endregion
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private readonly VisualCollection mVisuals;
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private DragDropAdorner(UIElement adornedElement) : base(adornedElement)
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{
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mVisuals = new VisualCollection(this);
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sCanvas = new Canvas
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{
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Background=Brushes.Transparent
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};
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mVisuals.Add(sCanvas);
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sLayer = AdornerLayer.GetAdornerLayer(adornedElement);
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sLayer?.Add(this);
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}
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protected override int VisualChildrenCount => mVisuals.Count;
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protected override Visual GetVisualChild(int index) => mVisuals[index];
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protected override Size ArrangeOverride(Size finalSize)
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{
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//var bubbleSize = _bubble.DesiredSize;
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//var location = new Point(finalSize.Width + 10, (finalSize.Height - bubbleSize.Height) / 2);
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//_bubble.Arrange(new Rect(location, DesiredSize));
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sCanvas.Arrange(new Rect(new Point(), finalSize));
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return finalSize;
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}
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}
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}
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