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DropLayout

这里自己动手dropTopLayout实现的一个类库 但这个类本身似乎就有问题 有人提出了优化http://www.jianshu.com/p/22f213f0c42f 我自己重写的时候碰到了很多问题，一些问题虽然在上链接中有提示 但是远远没有自己写一边后清晰
在使用ViewDraghelper 碰到两个简单的问题

  • 忘 记给getViewVerticalDragRange赋值，代码注释上说如果返回0，无法返回正确的获取view，结果我在clampViewPositionVertical中就可以限制view活动的范围， range忘了写，根据以往看到的demo 直接在onInterceptTouchEvent方法结尾返回true，果然也是可以滑动，但是这样在嵌套时事件永远无法传递到子view， 在shouldInterceptTouchEvent 结尾判断mDragState == STATE_DRAGGING时 如果range == 0 ，状态永远是0

  • 如果cancel时，ViewDragHelp 没有调用processTouchEvent 那么状态用户是STATE_DRAGGING 事件依然无法分发

另外手动调用dragContentView.dispatchTouchEvent(ev); 可以继续分发事件

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