How to inject a new Action into existing Node?

http://netbeans-org.1045718.n5.nabble.com/How-to-inject-a-new-Action-into-existing-Node-td2986918.html

Hi,

I have two modules A and B where B should bring some extensions to A.

The module A is a source of custom Nodes and I need to add a new Action into the context menu of such nodes.
How can I do that in module B declaratively? I looked at several samples and Wiki, but nowhere found a clear answer on this question.

Thanks a lot for any help.

Vlad.

Vlad wrote:
> Hi,
>
> I have two modules A and B where B should bring some extensions to A.
>
> The module A is a source of custom Nodes and I need to add a new Action into the context menu of such nodes.
> How can I do that in module B declaratively? I looked at several samples and Wiki, but nowhere found a clear answer on this question.
>

In A's Node implementation:
    public Action[] getActions( boolean context ) {
        List<Action> actions = new ArrayList<Action>();
        for (Object o :
Lookups.forPath("MyActionsFolder").lookupAll(Object.class)) {
            if (o instanceof Action) {
                actions.add((Action) o);
            } else if (o instanceof JSeparator) {
                actions.add(null);
            }
        }
        return actions.toArray(new Action[actions.size()]);
    }

In B's layer file:
<folder name="MyActionsFolder">
    <file name="MyBeeAction.instance"/>
</folder>

You've got the idea.

> Thanks a lot for any help.
>
> Vlad.

另外，为将当前所选结点的信息传递给MyBeeAction：

1 在A的Node实现中稍微修改一下：

PeerInfo peerInfo = getLookup().lookup(PeerInfo.class);   // 假设peerInfo为当前选中结点信息

Action[] actions = ...  // 获得Action数组（代码略）

for(int i=0; i<actions.length; i++) {

    actions[i].putValue("PEERINFO", peerInfo);

}

return actions;

2 在 B的Action中接收

public void actionPerformed(ActionEvent e) {

     PeerInfo = (PeerInfo)getValue("PEERINFO");

    // other stuff...

}

 -----------------------------------------------------------------------------------------------------------------------

上面只是一个临时的解决方式，估计Action类中在设计putValue和getValue时的本意并不是这样的。

还没有找到优雅一点的解决方式。

 -----------------------------------------------------------------------------------------------------------------------

在《NetBeans Platform 6.9 Developer's Guide》中发现一条线索，似乎org.openide.util.Utilities.actionsGlobalContext就是干这个用的。

 The static method Utilities.actionsGlobalContext() gives you access to the Lookup of whichever TopComponent currently is the Activated TopComponent.

As the user can only work on one TopComponent at a time, there is always at most one active TopComponent. With that in mind, you never needed to merge the Lookups of the two TopComponents at all. 

尚未测试，也许我的理解有错误。

-------------------------------------------------------------------------------------------------------------------------

另外，在该书P143页有一段EditAction的代码：

public class EditAction extends AbstractAction implements LookupListener, Presenter.Toolbar {

    private Lookup.Result<Task> result;
    private JButton toolbarBtn;

    public EditAction() {
        this(Utilities.actionsGlobalContext());
    }

    public EditAction(Lookup lookup) {
        
        super("Edit Task...", new ImageIcon("com/netbeansrcp/taskactions/Universal.png")));

        this.result = lookup.lookupResult(Task.class);
        this.result.addLookupListener(this);
        this.resultChanged(new LookupEvent(result);
    }

    public void actionPerformed(ActionEvent arg0) {
    if(null != this.result && 0<this.result.allInstances().size()) {
        Task task = this.result.allInstances().iterator().next();
        EditAction.openInTaskEditor(task);
    }

    // ...
}