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...
}
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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。
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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。
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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); } // ... }