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There is a new mechanism for filtering actions based on resource content This filtering is specified in the plug-in manifest (does not load your plug-in) and determines whether an action should be visible or enabled by inspecting a file s content For example, the Run Ant command is associated with resources named buildxml, but no others; what if your Ant script is located in a file called exportxml This new mechanism can determine whether the Run Ant command should be visible based on the first XML tag or DTD specified in the file In this case, the orgeclipseantcore plug-in defines a new antBuildFile content type:
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<extension point="orgeclipsecoreruntimecontentTypes"> <content-type id="antBuildFile" name="%antBuildFileContentTypename" base-type="orgeclipsecoreruntimexml" file-names="buildxml" file-extensions="macrodef,ent,xml" priority="normal"> <describer class="orgeclipseantinternalcore contentDescriberAntBuildfileContentDescriber"> </describer> </content-type> </extension>
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CHAPTER 6 Commands and Actions
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The preceding declaration associates the antBuildFile content type with the AntBuildfileContentDescriber class, which determines whether XML content is Ant content The antBuildFile content type can then be used to specify action visibility and enablement, editor association, and more For more about declaring and using your own content types, see the following: Content Sensitive Object Contributions at eclipseorg > projects > The Eclipse Project > Platform > UI > Development Resources > Content Sensitive Object Contributions, or browse deveclipseorg/viewcvs/index cgi/~checkout~/platform-ui-home/object-aware-contributions/ objConthtm Content types in the Eclipse Help System at Help > Help Contents > Platform Plug-in Developer Guide > Programmer s Guide > Runtime overview > Content types A central content type catalog for Eclipse at deveclipseorg/viewcvs/ indexcgi/platform-core-home/documents/content_typeshtml rev=111 Content types in Eclipse at eclipseorg/eclipse/platform-core/ planning/30/plan_content_typeshtml
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673 IObjectActionDelegate
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Getting back to the Favorites plug-in, the next task is to create an action delegate that implements the IObjectActionDelegate interface, which performs the operation behind the new Add to Favorites menu item Create a new AddToFavoritesActionDelegate class as described next Since the Favorites view is not fully functional, the action we are about to create will display a message rather than adding the selected items to the view (see Section 731, Model command handlers, on page 313 for more implementation details) Start by selecting the action defined in Section 671, Defining an objectbased action, on page 257 and then clicking on the class: label to the left of the class field This opens the New Java Class wizard for creating a new Java class Fill in the package and class name fields as necessary and be sure to add IObjectActionDelegate as the interface to implement, then click Finish to generate the new class Next, add a new field and modify the setActivePart() method to cache the view or editor in which the action appears:
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private IWorkbenchPart targetPart; public void setActivePart(IAction action, IWorkbenchPart part) { thistargetPart = part; }
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67 Object Actions
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Finally, modify the run() method to open a message dialog indicating that this action was successfully executed As mentioned before, this action delegate will be fleshed out in Section 731, Model command handlers, on page 313
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public void run(IAction action) { MessageDialogopenInformation( targetPartgetSite()getShell(), "Add to Favorites", "Triggered the " + getClass()getName() + " action"); }
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674 Creating an object-based submenu
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Menus can be contributed to a context menu in a manner similar to adding actions If three or more similar actions are contributed, then think about placing those actions in a submenu rather than in the context menu itself The Favorites plug-in only adds one action to the context menu, but let s place the action in a submenu rather than in the context menu itself To create the Favorites menu, right-click on the comqualityeclipsefavoritespopupMenu object contribution in the Extensions page of the plugin manifest editor, and select New > menu Enter the following values for this new menu: id comqualityeclipsefavoritespopupSubMenu The identifier for the submenu label Favorites The text appearing in the context menu as the name of the submenu path additions The insertion point that determines the location in the context menu where the submenu will appear (see Section 665, Insertion points, on page 248) Next, add a groupMarker to the menu with the name content and a separator with the name additions (see Section 662, Groups in a menu, on page 245) Finally, modify the Add to Favorites action s attributes as follows so that the action will now be part of the new Favorites submenu: label Add The text appearing in the submenu as the name of the action menubarPath comqualityeclipsefavoritespopupSubMenu/content The insertion point that determines where the Favorites submenu action will appear (see Section 665, Insertion points, on page 248)
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