Graphical Editor Classes in Java

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2063 Graphical Editor Classes
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GEF provides three classes upon which editors can be built GraphicalEditor is the superclass of both GraphicalEditorWithPalette and GraphicalEditorWithFlyoutPalette which, as their names suggest, implement extra methods which place a palette on the editor If you do not need a palette in your editor, then extend GraphicalEditor rather than one of its subclasses
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20631 GraphicalEditor
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Some of the interesting methods provided by this superclass include:
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createActions() Creates actions for this editor Subclasses should override this method to create and register actions with the ActionRegistry getCommandStack() Returns the command stack getEditDomain() Returns the edit domain initializeGraphicalViewer() Override to set the contents of the GraphicalViewer after it has been created setEditDomain(DefaultEditDomain) Sets the EditDomain for this
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20632 GraphicalEditorWithPalette
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This class extends GraphicalEditor to provide a fixed palette
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getPaletteRoot() Must be implemented by the subclass to return the PaletteRoot for the palette viewer
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206 GEF in an Eclipse Editor
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20633 GraphicalEditorWithFlyoutPalette
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Similar to GraphicalEditorWithPalette, this class extends GraphicalEditor to provide a palette, but this palette can be moved and collapsed by the user
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getPaletteRoot() Must be implemented by the subclass to return the PaletteRoot for the palette viewer getPalettePreferences() By default, this method returns a FlyoutPreferences object that stores the flyout settings in the GEF plugin
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Sub-classes may override
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20634 Edit Domain
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A GEF editor not only displays information graphically, but also facilitates user manipulation of that information To facilitate editor changes to the model, each GEF editor must have an edit domain The edit domain provides the interface for all user actions (see Section 2065, User Interaction with GEF, on page 763), tracks of the command stack (see Section 20661, Undo and Redo Commands, on page 768), the active tool and the palette (see Section 207, Palette, on page 775) For our purposes, the DefaultEditDomain class provided by GEF has everything we need We instantiate this domain in our editor s constructor
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2064 FavoritesGEFEditor
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Our editor (see Figure 20 5 on page 758) extends GraphicalEditorWithFlyoutPalette so that it can include a palette from which actions can be initiated Start by creating a new editor extension (see Section 81, Editor Declaration, on page 354) class comqualityeclipsefavoritesgefeditorsFavoritesGEFEditor contributorClass comqualityeclipsefavoritesgefeditors FavoritesGEFEditorContributor (see Section 20661, Undo and Redo Commands, on page 768) id comqualityeclipsefavoritesgefeditor name Favorites GEF Editor and then implement FavoritesGEFEditor This editor contains a series of statements similar to the Favorites GEF View that sets the connection router to an instance of ShortestPathConnectionRouter
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CHAPTER 20 GEF: Graphical Editing Framework
public class FavoritesGEFEditor extends GraphicalEditorWithFlyoutPalette { public static final String ID = "comqualityeclipsefavoritesgefeditor"; private FavoritesManager model; public FavoritesGEFEditor() { setEditDomain(new DefaultEditDomain(this)); } protected void setInput(IEditorInput input) { supersetInput(input); model = ((FavoritesGEFEditorInput) input)getModel(); } protected void configureGraphicalViewer() { superconfigureGraphicalViewer(); GraphicalViewer viewer = getGraphicalViewer(); viewersetEditPartFactory(new FavoritesEditPartFactory(true)); viewersetRootEditPart(new ScalableFreeformRootEditPart()); } protected void initializeGraphicalViewer() { superinitializeGraphicalViewer(); GraphicalViewer viewer = getGraphicalViewer(); viewersetContents(model); ScalableFreeformRootEditPart rootEditPart = (ScalableFreeformRootEditPart) viewergetRootEditPart(); FavoritesManagerEditPart managerPart = (FavoritesManagerEditPart) rootEditPartgetChildren()get(0); ConnectionLayer connectionLayer = (ConnectionLayer) rootEditPartgetLayer(LayerConstantsCONNECTION_LAYER); connectionLayersetConnectionRouter( new ShortestPathConnectionRouter(managerPartgetFigure())); } public Object getAdapter(Class type) { if (type == FavoritesManagerclass) return model; return supergetAdapter(type); } }
As mentioned earlier, our editor does not store content in a workspace file To prevent the application from prompting the user and saving the editor content to a workspace file, add the following methods
public boolean isDirty() { return false; } public void doSave(IProgressMonitor monitor) { // do nothing }
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20641 Opening the editor
The favorites model is not stored in a workbench file and we cannot open it from the Package Explorer, thus we create a Open Favorites Editor command (see Section 611, Defining a command, on page 216) id comqualityeclipsefavoritesgefcommandsopenEditor name Open Favorites Editor description Open the Favorites editor if it is not already visible categoryId comqualityeclipsefavoritescommandscategory defaultHandler comqualityeclipsefavoritesgefhandlers OpenFavoritesEditorHandler The following is used to create a new menu contribution so that the command above is visible in the Favorites menu (see Section 621, Defining a top level menu, on page 220) locationURI menu:comqualityeclipsefavoritesmenusfavoritesMenu after=additions commandId comqualityeclipsefavoritesgefcommandsopenEditor The command define above has a default handler associated with it that opens the Favorites GEF Editor if it is not already open
public class OpenFavoritesEditorHandler extends AbstractHandler { public Object execute(ExecutionEvent event) throws ExecutionException { try { IEditorInput editorInput = new FavoritesGEFEditorInput(FavoritesManagergetManager()); ActivatorgetDefault() getWorkbench() getActiveWorkbenchWindow() getActivePage() openEditor(editorInput, FavoritesGEFEditorID); } catch (PartInitException e) { eprintStackTrace(); } return null; } }