DragSource.java 文件源码

public void startDrag(DragGestureEvent trigger, Cursor dragCursor, 
                      Image dragImage, Point imageOffset, 
                      Transferable transferable, DragSourceListener dsl,
                      FlavorMap flavorMap)
        throws InvalidDnDOperationException {

    if (curContext != null) {
        // awt.171=Attempt to start a drag while an existing drag operation is still executing.
        throw new InvalidDnDOperationException(Messages.getString("awt.171"));  //$NON-NLS-1$
    }

    DragSourceContextPeer peer =
        Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);
    curContext = createDragSourceContext(peer, trigger, dragCursor,
                                         dragImage, imageOffset,
                                         transferable, dsl);

    peer.startDrag(curContext, dragCursor, dragImage, imageOffset);
    curContext = null;
}