Editor Actions in Java

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Editor Actions
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super(text, imageDescriptor); thiseditor = editor; thisviewer = viewer; setEnabled(false); vieweraddSelectionChangedListener(listener); } public void run() { ISelection sel = viewergetSelection(); TableTree tableTree = viewergetTableTree(); tableTreesetRedraw(false); try { Iterator iter = ((IStructuredSelection) sel)iterator(); while (iterhasNext()) ((PropertyElement) ((Object) iternext())) removeFromParent(); } finally { tableTreesetRedraw(true); } } }
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Tip: As shown in the code above, use TableTree's setRedraw(boolean) method to reduce flashing when making more than one modification to a control or its model
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In PropertiesEditor create a new field to hold the action and then call the following new method from createPages() method to initialize the field
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private RemovePropertiesAction removeAction; private void createActions() { ImageDescriptor removeImage = PlatformUI getWorkbench() getSharedImages() getImageDescriptor(
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ISharedImagesIMG_TOOL_DELETE); ImageDescriptor removeImageHover = PlatformUI getWorkbench() getSharedImages() getImageDescriptor( ISharedImagesIMG_TOOL_DELETE_HOVER); removeAction = new RemovePropertiesAction( this, tableTreeViewer, "Remove", removeImage); removeActionsetHoverImageDescriptor( removeImageHover); }
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This same action is used later for keyboard based actions (see Section 8524) and global actions (see Section 8521)
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8512 Creating the context menu
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The context menu must be created at the same time as the editor However, because contributors can add and remove menu items based upon the 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 each time, and add a menu listener to dynamically build the menu In addition, the menu must be registered with the control so that it
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Editor Actions
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will be displayed, and with the editor site so that other plug-ins can contribute actions to it (see Section 64) For the Properties editor, modify createPages()
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to call the new createContextMenu() method shown below
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private void createContextMenu() { MenuManager menuMgr = new MenuManager("#PopupMenu"); menuMgrsetRemoveAllWhenShown(true); menuMgraddMenuListener(new IMenuListener() { public void menuAboutToShow(IMenuManager m) { PropertiesEditorthisfillContextMenu(m); } }); Table table = tableTreeViewergetTableTree()getTable(); Menu menu = menuMgrcreateContextMenu(table); tablesetMenu(menu); getSite()registerContextMenu( menuMgr, tableTreeViewer); }
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Dynamically building the context menu
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Each time the user clicks the right mouse button, the context menu s content must be rebuilt from scratch because contributors may add actions based upon the editor's selection In addition, the context menu must contain a separator with the IWorkbenchActionConstantsMB_ADDITIONS constant indicating where those contributed actions will appear in the context menu The
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createContextMenu()
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method (see section 8512) calls the new fillConmethod shown below
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textMenu(IMenuManager)
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private void fillContextMenu(IMenuManager menuMgr) { boolean isEmpty = tableTreeViewergetSelection()isEmpty(); removeActionsetEnabled(!isEmpty); menuMgradd(removeAction); menuMgradd( new Separator( IWorkbenchActionConstantsMB_ADDITIONS)); }
Once this functionality is in place, the context menu will appear containing only the Remove menu item (see Figure 8-8)
Figure 8-8 The Properties editor s context menu
Editor Actions
852 Editor Contributor An instance of orgeclipseuiIEditorActionBarContributor manages the installation and removal of global menus, menu items, and toolbar buttons for one or more editors The plug-in manifest specifies which contributor, typically a subclass of orgeclipseuipartEditorActionBarContributor or
orgeclipseuipartMultiPageEditorActionBarContributor,
is associated with
which editor type (see Section 81) The platform then sends the following events to the contributor indicating when an editor has become active or inactive so that the contributor can install or remove menus and buttons as appropriate:
dispose()
This method is automatically called when the con-
tributor is no longer needed Cleanup any platform resources, such as images, clipboard, etc, that were created by this class This follows the if you create it you destroy it theme that runs throughout Eclipse
init(IActionBars, IWorkbenchPage)
- This method is called
TT 8 Editors
when the contributor is first created
setActiveEditor(IEditorPart)
- This method is called when an
associated editor becomes active or inactive The contributor should insert and remove menus and toolbar buttons as appropriate
The EditorActionBarContributor class implements the interface IEditorActionBarContributor,
caches the action bar and the workbench page, and pro-
vides two new accessor methods:
getActionBars()
- Returns the contributor's action bars pro-
vided to the contributor when it was initialized
getPage()
- Returns the contributor's workbench page provided
to the contributor when it was initialized
The MultiPageEditorActionBarContributor class extends EditorActionBarContributor,
providing new methods to override instead of the setActiveEdimethod:
tor(IEditorPart)
setActivePage(IEditorPart)
- Sets the active page of the multi-
Editor Actions
page editor to the given editor If there is no active page, or if the active page does not have a corresponding editor, then the argument is null