View source for Menu Contributions/IFile objectContribution

= IFile object contribution =

We also have to provide object contributions (which in the past were scoped by objectClass).

Here's an example from one of our plugin.xml:

<source lang="xml">
<objectContribution adaptable="true"
    objectClass="org.eclipse.core.resources.IFile"
    nameFilter="*.xml"
    id="org.eclipse.jdt.internal.ui.javadocexport.JavadocWizard">
  <visibility>
      <objectState name="contentTypeId"
          value="org.eclipse.ant.core.antBuildFile" />
  </visibility>
  <action label="Create Javadoc"
      class="org.eclipse.jdt.internal.ui.CreateJavadocActionDelegate"
      enablesFor="1" id="LaunchJavadocWizard"/>
</objectContribution>
</source>

<b>enablesFor</b> is now a property of the active handler, not the visible GUI element.

== Menus ==

There will be a reserved popup ID, "org.eclipse.ui.popup.any" that will allow contributions to any popup menu.

   <source lang="xml">
   <extension point="org.eclipse.core.expressions.definitions">
      <definition id="org.eclipse.ui.example.antFile">
         <iterate ifEmpty="false">
            <adapt type="org.eclipse.core.resources.IFile">
               <test property="org.eclipse.core.resources.name" 
                     value="*.xml"/>
               <test property="org.eclipse.core.resources.contentTypeId"
                     value="org.eclipse.ant.core.antBuildFile"/>
            </adapt>
         </iterate>
      </definition>
   </extension>
   <extension point="org.eclipse.ui.menus">
      <menuContribution locationURI="popup:org.eclipse.ui.popup.any">
         <command commandId="org.eclipse.jdt.ui.launchJavadocWizard"
               id="LaunchJavadocWizard"
               label="Create Javadoc"
               style="push">
            <visibleWhen checkEnabled="false">
               <or>
                  <with variable="activeMenuSelection">
                     <reference definitionId="org.eclipse.ui.example.antFile"/>
                  </with>
                  <with variable="activeMenuEditorInput">
                     <reference definitionId="org.eclipse.ui.example.antFile"/>
                  </with>
               </or>
            </visibleWhen>
         </command>
      </menuContribution>
   </extension>
   </source>


The default variable for visibleWhen/activeWhen/enabledWhen expressions is '''selection'''.  But it's better to be specific and use &lt;with variable="selection".../&gt; if that's what you need.

== Menus API ==

Here is a similar example programmatically.

<source lang="java">
 public static void addFileContribution() {
     final IMenuService menuService = (IMenuService) PlatformUI
             .getWorkbench().getService(IMenuService.class);
     // an expression that walks the selection looking for objectclasses
     final ObjectClassExpression ifileExpression = new ObjectClassExpression(
             "org.eclipse.core.resources.IFile");
 
     final ImageDescriptor postIcon = AbstractUIPlugin
             .imageDescriptorFromPlugin("org.eclise.ui.tests",
                     "icons/full/elcl16/post_wiki.gif");
     final ImageDescriptor loadIcon = AbstractUIPlugin
             .imageDescriptorFromPlugin("org.eclise.ui.tests",
                     "icons/full/elcl16/load_wiki.gif");
     AbstractContributionFactory factory = new AbstractContributionFactory(
             "popup:org.eclipse.ui.popup.any?after=additions") {
         public void createContributionItems(IMenuService menuService,
                 List additions) {
             CommandContributionItem item = new CommandContributionItem(
                     "org.eclipse.ui.examples.wiki.post",
                     "org.eclipse.ui.examples.wiki.post", null, postIcon,
                     null, null, null, "P", null,
                     CommandContributionItem.STYLE_PUSH);
             menuService.registerVisibleWhen(item, ifileExpression);
             additions.add(item);
 
             item = new CommandContributionItem(
                     "org.eclipse.ui.examples.wiki.load",
                     "org.eclipse.ui.examples.wiki.load", null, loadIcon,
                     null, null, null, "L", null,
                     CommandContributionItem.STYLE_PUSH);
             menuService.registerVisibleWhen(item, ifileExpression);
             additions.add(item);
         }
 
         public void releaseContributionItems(IMenuService menuService,
                 List items) {
         }
     };
     menuService.addContributionFactory(factory);
 }
</source>

The location of org.eclipse.ui.popup.any specifies any context menu, and the expression ties it to a specific objectClass.  Using the new expression syntax you can make your conditions more complex.

You can set your visibleWhen expression on each item as you create it.

In '''3.3M6''' registerVisibleWhen(*) method might be changing.