DragRecognitionSupport.java 文件源码

/**
 * Returns whether or not the event is potentially part of a drag sequence.
 */
private boolean mousePressedImpl(MouseEvent me) {
    component = (JComponent)me.getSource();

    if (mapDragOperationFromModifiers(me, component.getTransferHandler())
            != TransferHandler.NONE) {

        motionThreshold = DragSource.getDragThreshold();
        dndArmedEvent = me;
        return true;
    }

    clearState();
    return false;
}