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Summary: Methods | [Expand All]

public static interface ItemTouchHelper.ViewDropHandler

android.support.v7.widget.helper.ItemTouchHelper.ViewDropHandler

Known Indirect Subclasses

一个可由LayoutManager实现的接口，用于更好地与 ItemTouchHelper集成。

公共方法(Public methods)
`abstract void`	`prepareForDrop(View view, View target, int x, int y)` 在View被放到另一个View上之后由 `ItemTouchHelper`调用。

void prepareForDrop (View view, 
                View target, 
                int x, 
                int y)

在View被放到另一个View上之后由 ItemTouchHelper调用。

一个LayoutManager应该实现这个接口来为即将到来的移动操作做好准备。

例如，LinearLayoutManager设置一个“scrollToPositionWithOffset”调用，以便在拖动时将视图作为锚视图使用，同时计算下一个布局，使布局保持一致。

参数(Parameters)
`view`	`View`: The View which is being dragged. It is very likely that user is still dragging this View so there might be other `prepareForDrop(View, View, int, int)` after this one.
`target`	`View`: The target view which is being dropped on.
`x`	`int`: The `left` offset of the View that is being dragged. This value includes the movement caused by the user.
`y`	`int`: The `top` offset of the View that is being dragged. This value includes the movement caused by the user.