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将事件传递给父级

event-handling swing user-interface java

viraptor · 技术社区 · 15 年前

JPanel 其中包含 JLabel . 顶端立即执行鼠标按下和拖动。我需要做些什么,才能让事件看起来像是他们到达目的地 面板 而不是标签本身。(更改源对象很重要)

3 回复 | 直到 6 年前

Tomas Narros 15 年前

在事件侦听器中,可以将事件分派给父组件。

存在 myEvent 事件处理函数参数:

Component source=(Component)myEvent.getSource();
source.getParent().dispatchEvent(myEvent);

因此,您可以创建单个事件处理程序并重用它,将其添加到所有选定的子级,如下所示:

final Container parent=this; //we are a the parent container creation code
MouseListener myCommonListener=new MouseListener() {
    @Override
    public void mouseClicked(MouseEvent e) {
        parent.dispatchEvent(e);
    }
    @Override
    public void mouseEntered(MouseEvent e) {
        parent.dispatchEvent(e);
    }
    @Override
    public void mouseExited(MouseEvent e) {
        parent.dispatchEvent(e);
    }
    @Override
    public void mousePressed(MouseEvent e) {
        parent.dispatchEvent(e);
    }
    @Override
    public void mouseReleased(MouseEvent e) {
        parent.dispatchEvent(e);
    }
};

JLabel label=new JLabel("This is the first Label");
label.addMouseListener(myCommonListener);

JLabel label2=new JLabel("This is the second Label");
label2.addMouseListener(myCommonListener);
//... and so on

Artjom B. 10 年前

public class RedispatchingMouseAdapter implements MouseListener, MouseWheelListener, MouseMotionListener{

    public void mouseClicked(MouseEvent e) {
        redispatchToParent(e);
    }

    public void mousePressed(MouseEvent e) {
        redispatchToParent(e);
    }

    public void mouseReleased(MouseEvent e) {
        redispatchToParent(e);
    }

    public void mouseEntered(MouseEvent e) {
        redispatchToParent(e);
    }

    public void mouseExited(MouseEvent e) {
        redispatchToParent(e);
    }

    public void mouseWheelMoved(MouseWheelEvent e){
        redispatchToParent(e);
    }

    public void mouseDragged(MouseEvent e){
        redispatchToParent(e);
    }

    public void mouseMoved(MouseEvent e) {
        redispatchToParent(e);
    }

    private void redispatchToParent(MouseEvent e){
        Component source = (Component) e.getSource();
        MouseEvent parentEvent = SwingUtilities.convertMouseEvent(source, e, source.getParent());
        source.getParent().dispatchEvent(parentEvent);
    }
}

AyCe 6 年前

鼠标事件会自动指向 有鼠标侦听器

因此,要实现您的目标,只需删除JLabel上的所有鼠标侦听器,它就永远不会被选为鼠标事件的目标。

以下代码将递归地禁用给定组件及其子组件上的鼠标侦听器:

public static void disableMouseForComponent(Component... components) {
    for (Component c : components) {
        if (c instanceof Container) {
            disableMouseForComponent(((Container) c).getComponents());
        }
        for (MouseListener l : c.getMouseListeners()) {
            c.removeMouseListener(l);
        }
        for (MouseMotionListener l : c.getMouseMotionListeners()) {
            c.removeMouseMotionListener(l);
        }
    }
}