Question

如何注册以获得有关侦听器对象事件的通知？

基本上我想要实现的目标可以通过以下方式实现：

this.mouseMoved（）= listener.mouseMoved（）

Class Secondary implements MouseMotionListener {

    public Secondary(MouseMotionListener listener) {

        // Here Secondary needs to be registered to the same observer that
        // listener is getting notified from so that the Secondary class's
        // mouseMoved() and mouseDragged() both fire at the same time and 
        // with the same MouseEvents as the listener's.
    }

    @Override
    void mouseMoved(MouseEvent e) {

        // This needs to be essentially the same as the events fired
        // in the constructor's parameter object
    }

    @Override
    void mouseDragged(MouseEvent e) {

        // This needs to be essentially the same as the events fired
        // in the constructor's parameter object
    }
}

Answer 1

监听器被调用方法的人触发，JComponents接受mouselisteners作为参数，因此你必须设置它：

JPanel panel = new JPanel();
jFrame.add(panel);
panel.addMouseListener(new Secondary());

如果要调度事件，可以使用委托模式。

class Secondary implements MouseMotionListener {
MouseMotionListener other;
public Secondary(MouseMotionListener listener) {
    other = listener;
}

@Override
void mouseMoved(MouseEvent e) {
    other.mouseMoved(e);
}

@Override
void mouseDragged(MouseEvent e) {
    other.mouseDragged(e);
}
}

从侦听器对象接收事件

1 个答案: