add comment for drag_target, add sample scene for debug.

com.unity.uiwidgets/Runtime/widgets/drag_target.cs

 using Unity.UIWidgets.rendering;
 using Unity.UIWidgets.ui;
 
+// 1) drag process
+// dragged
+// _DraggableState::_startDrag
+// drag object _DragAvatar is created.
+// DragDropState is created
+// Draggable is created
+//
+// If dragged to target, the responding behavior code packaged in DragTarget built from DragTargetWidgetState willed invoked.
+//
+// 2) how do the currently dragged item changes its position accordingly ?
+// When mouse move, MultiDragPointerState::_move is triggered, the new posintion info will be updated into _DragAvatar through _DragAvatar::update.
+//
+// 3) which part of the codes are called when the dragged item is finally dropped into one drag target and what happens specifically ?
+// When the dragged item is finally dropped into one drag target, DragTarget's onAccept callback is called.
+
 namespace Unity.UIWidgets.widgets {
     public delegate bool DragTargetWillAccept<T>(T data);
 
         }
     }
 
+    // 拖动上下文context的封装
     public class Draggable<T> : StatefulWidget {
         public Draggable(
             Key key = null,
     }
 
 
+    // 针对长按的Draggable的子类
     public class LongPressDraggable<T> : Draggable<T> {
         public LongPressDraggable(
             Key key = null,
         }
     }
 
+    // 动作的分发，_DragAvatar的创建
+    // depend: _DragAvatar, DraggableDetails
     public class _DraggableState<T> : State<Draggable<T>> {
         public override void initState() {
             base.initState();
     }
 
 
+    // 记录一些drag的细节信息：速度，偏移
     public class DraggableDetails {
         public DraggableDetails(
             bool wasAccepted = false,
     }
 
 
+    // 托管函数的封装
     public class DragTarget<T> : StatefulWidget {
         public DragTarget(
             Key key = null,
         }
     }
 
+    // 管理被拖动的对象(_DragAvatar)
+    // 依赖于_DragAvatar, DragTarget
     public class _DragTargetState<T> : State<DragTarget<T>> {
         readonly List<_DragAvatar<T>> _candidateAvatars = new List<_DragAvatar<T>>();
         readonly List<_DragAvatar<T>> _rejectedAvatars = new List<_DragAvatar<T>>();
     }
 
     public delegate void _OnDragEnd(Velocity velocity, Offset offset, bool wasAccepted);
-
-
+    
+    // 被拖动的对象的封装
+    // 依赖于_DragTargetState
     public class _DragAvatar<T> : Drag {
         public _DragAvatar(
             OverlayState overlayState,

Samples/UIWidgetsSamples_2019_4/Assets/WidgetsSample/DoubleClickSample.cs

+using System.Collections;
+using System.Collections.Generic;
+using uiwidgets;
+using Unity.UIWidgets.engine;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+using ui_ = Unity.UIWidgets.widgets.ui_;
+
+namespace UIWidgetsSample
+{
+    public class DoubleClickSample : UIWidgetsPanel
+    {
+        protected override void main()
+        {
+            ui_.runApp(new MyApp());
+        }
+
+        class MyApp : StatelessWidget
+        {
+            public override Widget build(BuildContext context)
+            {
+                return new WidgetsApp(
+                    color: Color.white,
+                    home: new DoubleClickApp(),
+                    pageRouteBuilder: (settings, builder) =>
+                        new PageRouteBuilder(
+                            settings: settings,
+                            pageBuilder: (Buildcontext, animation, secondaryAnimation) => builder(context)
+                        )
+                );
+            }
+
+            class DoubleClickApp : StatefulWidget
+            {
+                public DoubleClickApp(Key key = null) : base(key)
+                {
+                }
+
+                public override State createState()
+                {
+                    return new DoubleClickState();
+                }
+            }
+
+            class DoubleClickState : State<DoubleClickApp>
+            {
+                int counter;
+
+                public override Widget build(BuildContext context)
+                {
+                    return new Container(
+                        color: Color.fromARGB(255, 0,0, 0),
+                        child: new Column(
+                            children: new List<Widget>
+                            {
+                                new Text("双击次数: " + counter,
+                                    style: new TextStyle(fontSize: 18, fontWeight: FontWeight.w100)),
+                                
+                                // new Container(
+                                //     margin: EdgeInsets.fromLTRB(200, 50, 200, 200),
+                                //     padding: EdgeInsets.symmetric(20, 60),
+                                //     color: Color.fromARGB(255, 0, 0, 0),
+                                //     child: new Text("双击次数: " + counter,
+                                //         style: new TextStyle(fontSize: 18, fontWeight: FontWeight.w100))
+                                // ),
+
+                                new GestureDetector(
+                                    onDoubleTap: () => { setState(() => { counter++; }); },
+                                    child: new Container(
+                                        margin: EdgeInsets.fromLTRB(200, 150, 200, 200),
+                                        padding: EdgeInsets.symmetric(40, 60),
+                                        color: counter % 2 == 0
+                                            ? Color.fromARGB(255, 0, 255, 0)
+                                            : Color.fromARGB(255, 0, 0, 255),
+                                        child: new Text("双击按钮",
+                                            style: new TextStyle(fontFamily: "racher", fontWeight: FontWeight.w100))
+                                    )
+                                )
+                            }
+                        )
+                    );
+                }
+            }
+            
+        }
+    }
+}

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