First, a DragSource object is required to initiate a drag-and-drop operation.

首先，需要一个DragSource对象来初始化拖放操作。

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Upon recognizing the gesture, the DragSource object can then be used to define the start of the operation with the information that is to be transfered.

系统一识别到此动作，可利用DragSource对象通过要传输的信息来定义操作的开始点。

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