XMouseDragGestureRecognizer.java 文件源码

/**
 * Invoked when a mouse button has been pressed on a component.
 */

public void mousePressed(MouseEvent e) {
    events.clear();

    if (mapDragOperationFromModifiers(e) != DnDConstants.ACTION_NONE) {
        try {
            motionThreshold = DragSource.getDragThreshold();
        } catch (Exception exc) {
            motionThreshold = 5;
        }
        appendEvent(e);
    }
}