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A view command can appear as a menu item in a view s context menu, as a toolbar button on the right side of a view s title bar, and as a menu item in a view s pull-down menu (see Figure 6 16 on page 270) This section covers adding commands to a view programmatically and registering that view so that others can contribute their own commands and actions via the plug-in manifest In contrast, Section 61, Commands, on page 216 and Section 68, View Actions, on page 270 discuss adding commands and actions using declarations in the plug-in manifest
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731 Model command handlers
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Now that the model objects are in place, the AddToFavoritesHandler class introduced in Section 631, Creating a new IHandler, on page 237 can be completed (implementing the AddToFavoritesActionDelegate introduced in Section 673, IObjectActionDelegate, on page 266 is very similar) With the modifications outlined below, the handler adds the selected items to the FavoritesManager, which then notifies the FavoritesViewContentProvider, which then refreshes the table to display the new information
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public Object execute(ExecutionEvent event) throws ExecutionException { ISelection selection = HandlerUtilgetCurrentSelection(event); if (selection instanceof IStructuredSelection) FavoritesManagergetManager()addFavorites( ((IStructuredSelection) selection)toArray()); return null; }
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CHAPTER 7
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Views
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732 Context menu
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Typically, views have context menus populated by commands targeted at the view or selected objects within it There are several steps to create a view s context menu programmatically If you want other plug-ins to contribute commands to your view s context menu via declarations in the plug-in manifest (see Section 625, Defining a selection-based context menu item, on page 223), then you must take several more steps to register your view
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7321 Creating contributions
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The first step is to create the contribution that will appear in the context menu For the Favorites view, a contribution that will remove the selected elements from the view is needed If isDynamic() returns true, then fill() will be called every time the context menu is displayed rather than only the first time the context menu is displayed This is useful if your contribution changes visibility In our case we do not override isDynamic() because our contribution changes enablement but not visibility
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package comqualityeclipsefavoritescontributions; import public class RemoveFavoritesContributionItem extends ContributionItem { private final FavoritesView view; private final IHandler handler; boolean enabled = false; private MenuItem menuItem; public RemoveFavoritesContributionItem(FavoritesView view, IHandler handler) { thisview = view; thishandler = handler; viewaddSelectionChangedListener( new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { enabled = !eventgetSelection()isEmpty(); updateEnablement(); } }); } public void fill(Menu menu, int index) { menuItem = new MenuItem(menu, SWTNONE, index); menuItemsetText("Remove"); menuItemaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { run(); } }); updateEnablement(); }
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private void updateEnablement() { Image image = PlatformUIgetWorkbench()getSharedImages()getImage( enabled ISharedImagesIMG_TOOL_DELETE : ISharedImagesIMG_TOOL_DELETE_DISABLED); if (menuItem != null) { menuItemsetImage(image); menuItemsetEnabled(enabled); } } public void run() { final IHandlerService handlerService = (IHandlerService) viewSitegetService(IHandlerServiceclass); IEvaluationContext evaluationContext = handlerServicecreateContextSnapshot(true); ExecutionEvent event = new ExecutionEvent(null, CollectionsEMPTY_MAP, null, evaluationContext); try { handlerexecute(event); } catch (ExecutionException e) { FavoritesLoglogError(e); } } }
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Tip: It is easier to contribute a command via the plug-in manifest per Section 626, Defining a view-specific menu or toolbar item, on page 228 than create a contribution as shown above unless you need the extra flexibility that creating your own contribution provides
RemoveFavoritesContributionItem uses a new handler to perform the
operation We separate this functionality from the contribution item so that it can be utilized elsewhere
public class RemoveFavoritesHandler extends AbstractHandler { public Object execute(ExecutionEvent event) throws ExecutionException { ISelection selection = HandlerUtilgetCurrentSelection(event); if (selection instanceof IStructuredSelection) FavoritesManagergetManager()removeFavorites( ((IStructuredSelection) selection)toArray()); return null; } }
In the FavoritesView class, provide access for the contribution to update its enablement state
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public void addSelectionChangedListener( ISelectionChangedListener listener) { vieweraddSelectionChangedListener(listener); }
CHAPTER 7
Views
and create a new fields
private IHandler removeHandler; private RemoveFavoritesContributionItem removeContributionItem;
and call the following new method from createPartControl(Composite) to initialize the field
private void createContributions() { removeHandler = new RemoveFavoritesHandler(); removeContributionItem = new RemoveFavoritesContributionItem(getViewSite(), removeHandler); }
This menu contribution is later associated with a keystroke in Section 735, Keyboard commands, on page 320, and Section 736, Global commands, on page 321
Checked menu item: For an example of a dynamically contributed menu item that has a checkmark, see Section 1437, Associating a nature with a project, on page 568 7322 Creating the context menu
The context menu must be created at the same time that the view is created, but because contributors add and remove menu items based on the current selection, its contents cannot be determined until just after the user clicks the right mouse button and just before the menu is displayed To accomplish this, set the menu s RemoveAllWhenShown property to true so that the menu will be built from scratch every time, and add a menu listener to dynamically build the menu In addition, the menu must be registered with the control so that it will be displayed and with the view site so that other plug-ins can contribute actions to it (see Section 625, Defining a selection-based context menu item, on page 223) For the Favorites view, modify createPartControl() to call the following new createContextMenu() method
private void createContextMenu() { MenuManager menuMgr = new MenuManager("#PopupMenu"); menuMgrsetRemoveAllWhenShown(true); menuMgraddMenuListener(new IMenuListener() { public void menuAboutToShow(IMenuManager m) { FavoritesViewthisfillContextMenu(m); } });