The controller can implement ActionListener and contains a List of ActionListeners.

控制器可以实现ActionListener并包含一个ActionListeners列表。

The controller you have to add to the The 3-4 top panels action listener. Now you can add any ActionListener you want to the controller action listener list.

您必须添加到3-4顶部面板动作侦听器的控制器。现在,您可以将所需的任何ActionListener添加到控制器动作侦听器列表中。

public void addListener(ActionListener listener)
{
   mActionListeners.add(listener);
}

public void removeListener(ActionListener listener)
{
   mActionListeners.remove(listener);
}

When the controller Action listener is called you have to call all action listener which are inside the controll list.

当调用控制器Action侦听器时,您必须调用控制列表中的所有动作侦听器。

public void actionPerformed(ActionEvent e) {
   List listeners = mActionListeners; // Edit 20090903
   for (Iterator iterator = listeners .iterator(); iterator.hasNext();) {
    ActionListener actionListener = (ActionListener)iterator.next();
    actionListener.actionPerformed(e);
   }
}

Even though Markus' solution remains the neatest I've seen so far, I've made some slight changes, which are hopefully improvements in the eyes of the original author as well ;).

虽然马库斯的解决方案仍然是我迄今为止看到的最好的解决方案,但我做了一些细微的改动,希望在原作者的眼中也能有所改善;)。

In case you add/remove an item of the list in response to an event, there is a chance of ending up with concurrent changes to the list; the event is handled, but the loop will continue in case there are more items after the one catching the event.

如果您添加/删除列表中的项目以响应事件,则有可能最终对列表进行并发更改;事件被处理,但是如果在捕获事件之后有更多项目,则循环将继续。

Therefore it's required to use a slightly different approach. I've decided to use the ListIterator.add() method, as this one supports modifications to the list while walking through its items. Possibly there are more elegant solutions available, but this one does the job pretty decent.

因此,需要使用稍微不同的方法。我决定使用ListIterator.add()方法,因为这个方法支持在遍历其项目时对列表进行修改。可能有更优雅的解决方案,但这个工作相当不错。

In case it will be of help to others; the modified code would similar be the following:

如果它对别人有帮助;修改后的代码类似如下:

ListIterator<ActionListener> iterator = mActionListeners.listIterator();

public void actionPerformed(ActionEvent e)
{
    iterator = mActionListeners.listIterator();
    while (iterator.hasNext()) 
    {
        ActionListener actionListener = (ActionListener)iterator.next();
        actionListener.actionPerformed(e);
    }
}

public void addListener(ActionListener listener)
{
    iterator.add(listener);
}

public void removeListener(ActionListener listener)
{
    iterator.remove(listener);
}

In case there are better solutions or improvements I'll be glad to hear those as well.

如果有更好的解决方案或改进,我也很高兴听到这些。