Eclipse Plugin: How to show a menu contribution only when a persective is active?

I created a menu contribution for an Eclipse plugin.

I would like the menu only to be visible when the p开发者_JAVA百科lugin perspective is active.

Here is what I found, in an open source project, and it works for me:

<extension
      point="org.eclipse.ui.menus">
   <menuContribution
         locationURI="menu:org.eclipse.ui.main.menu?after=additions">
      <menu
            id="menu1"
            label="Menu 1">
         <visibleWhen checkEnabled="false">
            <with variable="activeWorkbenchWindow.activePerspective">
                <equals value="myperspective"/>
            </with>
         </visibleWhen>
         <dynamic class="MenuPopulationClass"
                id="MenuPopulation"/>
      </menu>
   </menuContribution>
</extension>

I suggest to use the Command Framework.

this tutorial can help you

To restrict the visibility of your commands you should check par. 5

This is a bare outline of what you need to do.

To limit the visibility of the top level menu, create an empty ActionSet through the Extension Point Selection dialog.

Next, add a visibleWhen expression to the top level menu item defined in the plugin.xml. Right click on the menu item and select New -> visibleWhen. Right click on the visibleWhen element and select New -> with

Set variable - "activeContexts"

Right click on the with element and select New -> iterate. Select the new iterate element and modify its properties so that any matching element will cause the expression to evaluate true.

Right click on the iterate element and select New -> equals, then modify the value property.

value = your new ActionSet

Finally, add the top level menu item to your ActionSet.