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add comment for drag_target, add sample scene for debug.

/jiacheng-demo_proctice
jiacheng.gao 3 年前
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0a2ca1d3
共有 2 个文件被更改,包括 570 次插入0 次删除
  1. 15
      com.unity.uiwidgets/Runtime/widgets/drag_target.cs
  2. 555
      Samples/UIWidgetsSamples_2019_4/Assets/Scene/DragDropTest.unity

15
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);

555
Samples/UIWidgetsSamples_2019_4/Assets/Scene/DragDropTest.unity


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