如何将catch/forward MouseWheel 事件传递给多个对象？

Question

我正在使用 yFiles library and I am handling a Graph2DView object named view. To activate mouseWheel scroll for this object, I have to add a listener in registerViewListeners 函数。但是，我也想在 mouseweel

时在 myClass mouseWheelMoved 函数中得到通知

public class MyClass extends MyBaseClass implements MouseWheelListener {
    
    Graph2DView view;  
    // ..... 

    @Override
    protected void registerViewListeners()   
    {  
         Graph2DViewMouseWheelScrollListener wheelListener = new Graph2DViewMouseWheelScrollListener();
         wheelListener.addToCanvas(view);
    
         // The two precedent instruction is equivalent to 
         // view.getCanvasComponent().addMouseWheelListener(this);
    }

    @Override
    public void mouseWheelMoved(MouseWheelEvent e) 
    {    
        // some work ...
    }  
}

问题:
如果我通过 registerViewListeners

注册我的 view 对象

 @Override
 protected void registerViewListeners()   
 {  
    Graph2DViewMouseWheelScrollListener wheelListener = new Graph2DViewMouseWheelScrollListener();
    wheelListener.addToCanvas(view);
 }

我的 mouseWheelMoved 函数不再收到通知：

@Override
public void mouseWheelMoved(MouseWheelEvent e) 
{    
    // not called
}

Answer 1

根据您的描述，您似乎只是删除了事件侦听器的注册。

在你实例化的地方MyClass，请同时加上：

 view.getCanvasComponent().addMouseWheelListener(myClassInstance); // register listener

如果你不注册你的监听器，它当然不会被调用。仅实例化它是不够的。

如何将catch/forward MouseWheel 事件传递给多个对象？

How to catch/forward MouseWheel event to several objects?

java

swing

mousewheel

yfiles