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    <p>If I revisit my answer "<a href="https://stackoverflow.com/questions/552435/eclipse-rcp-actions-vs-commands">Eclipse RCP: Actions VS Commands</a>", you need a Command handler.</p> <p><a href="http://dev.eclipse.org/newslists/news.eclipse.platform/msg77651.html" rel="nofollow noreferrer">This thread</a> seems to sum up your options:</p> <blockquote> <ul> <li><p>One is a common pattern, to instantiate the handler in the view itself and have the handler simply look at the view selection and control its own enabled state.<br> The handler API allows it to fire an event on enabled change, see <a href="http://kickjava.com/src/org/eclipse/core/commands/AbstractHandler.java.htm" rel="nofollow noreferrer"><code>org.eclipse.core.commands.AbstractHandler</code></a>.</p></li> <li><p>The other is to create a property tester that can get your view selection.</p></li> </ul> </blockquote> <pre><code>IWorkbenchPart p = page.findViewReference("your.id").getPart(false); if (p!=null) { p.getSite().getSelectionProvider().getSelection() ... whatever } </code></pre> <blockquote> <p>Your view would monitor its own selection change events, and call <a href="http://help.eclipse.org/stable/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/api/org/eclipse/ui/services/IEvaluationService.html" rel="nofollow noreferrer"><code>org.eclipse.ui.services.IEvaluationService.requestEvaluation(String)</code></a> (source <a href="http://www.java2s.com/Open-Source/Java-Document/IDE-Eclipse/ui-workbench/org/eclipse/ui/internal/services/IEvaluationService.java.htm" rel="nofollow noreferrer">here</a>) for that property (which would cause all core expressions using that property tester to be re-evaluated).<br> The important point is that simply changing views would not cause a re-evaluation (and not change enabled state).</p> <p>You can set up the property tester to be specific to each view that you need this for, or create one <code>com.example.views.localSelection</code> and use <code>args</code> to specify the view <code>id</code>.</p> </blockquote>
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    1. POHow do you contribute a command to an editor context menu in Eclipse
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    1. COThanks VonC. So looking at this, I can see no benefit to doing this with commands vs. objectContributions and Actions. Thoughts?
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    2. COIf the `Command`/`handler` is not reused in many editors/views, it can be a little overkill and a single `Action` is enough.
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