<itemvalue="Signature for building children of a [DragTarget]. The `candidateData` argument contains the list of drag data that is hovering over this [DragTarget] and that has passed [DragTarget.onWillAccept]. The `rejectedData` argument contains the list of drag data that is hovering over this [DragTarget] and that will not be accepted by the [DragTarget]."/>
<itemvalue="匹配"/>
<itemvalue="match"/>
<itemvalue="Invalidates the state of the provider, causing it to refresh. The refresh is not immediate and is instead delayed to the next read or next frame. Calling [invalidateSelf] multiple times will refresh the provider only once. Calling [invalidateSelf] will cause the provider to be disposed immediately."/>