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using System;
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using System.Collections.Generic;
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using UnityEngine;
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namespace FairyGUI
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{
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/// <summary>
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/// Helper for drag and drop.
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/// 这是一个提供特殊拖放功能的功能类。与GObject.draggable不同，拖动开始后，他使用一个替代的图标作为拖动对象。
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/// 当玩家释放鼠标/手指，目标组件会发出一个onDrop事件。
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/// </summary>
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public class DragDropManager
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{
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private GLoader _agent;
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private object _sourceData;
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private GObject _source;
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private static DragDropManager _inst;
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public static DragDropManager inst
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{
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get
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{
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if (_inst == null)
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_inst = new DragDropManager();
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return _inst;
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}
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}
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public DragDropManager()
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{
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_agent = (GLoader)UIObjectFactory.NewObject(ObjectType.Loader);
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_agent.gameObjectName = "DragDropAgent";
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_agent.SetHome(GRoot.inst);
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_agent.touchable = false;//important
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_agent.draggable = true;
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_agent.SetSize(100, 100);
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_agent.SetPivot(0.5f, 0.5f, true);
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_agent.align = AlignType.Center;
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_agent.verticalAlign = VertAlignType.Middle;
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_agent.sortingOrder = int.MaxValue;
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_agent.onDragEnd.Add(__dragEnd);
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}
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/// <summary>
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/// Loader object for real dragging.
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/// 用于实际拖动的Loader对象。你可以根据实际情况设置loader的大小，对齐等。
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/// </summary>
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public GLoader dragAgent
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{
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get { return _agent; }
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}
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/// <summary>
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/// Is dragging?
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/// 返回当前是否正在拖动。
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/// </summary>
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public bool dragging
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{
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get { return _agent.parent != null; }
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}
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/// <summary>
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/// Start dragging.
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/// 开始拖动。
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/// </summary>
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/// <param name="source">Source object. This is the object which initiated the dragging.</param>
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/// <param name="icon">Icon to be used as the dragging sign.</param>
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/// <param name="sourceData">Custom data. You can get it in the onDrop event data.</param>
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/// <param name="touchPointID">Copy the touchId from InputEvent to here, if has one.</param>
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public void StartDrag(GObject source, string icon, object sourceData, int touchPointID = -1)
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{
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if (_agent.parent != null)
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return;
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_sourceData = sourceData;
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_source = source;
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_agent.url = icon;
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GRoot.inst.AddChild(_agent);
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_agent.xy = GRoot.inst.GlobalToLocal(Stage.inst.GetTouchPosition(touchPointID));
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_agent.StartDrag(touchPointID);
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}
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/// <summary>
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/// Cancel dragging.
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/// 取消拖动。
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/// </summary>
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public void Cancel()
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{
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if (_agent.parent != null)
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{
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_agent.StopDrag();
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GRoot.inst.RemoveChild(_agent);
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_sourceData = null;
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}
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}
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private void __dragEnd(EventContext evt)
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{
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if (_agent.parent == null) //cancelled
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return;
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GRoot.inst.RemoveChild(_agent);
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object sourceData = _sourceData;
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GObject source = _source;
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_sourceData = null;
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_source = null;
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GObject obj = GRoot.inst.touchTarget;
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while (obj != null)
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{
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if (obj.hasEventListeners("onDrop"))
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{
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obj.RequestFocus();
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obj.DispatchEvent("onDrop", sourceData, source);
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return;
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}
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obj = obj.parent;
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}
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}
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}
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} |