Window2D.java 文件源码

/**
 * Remove a listener for mouse wheel events.
 *
 * @param listener The mouse wheel listener to remove.
 */
public void removeMouseWheelListener(MouseWheelListener listener) {
    if (app == null) {
        return;
    }
    synchronized (app.getAppCleanupLock()) {
        synchronized (this) {
            if (mouseWheelListeners == null) {
                return;
            }
            mouseWheelListeners.remove(listener);
            if (mouseWheelListeners.size() == 0) {
                mouseWheelListeners = null;
            }
        }
    }
}