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205 GEF in an Eclipse View
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2051 Listening to Model Changes
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As the model changes, we would like the view to automatically adjust so that it always displays the current model state To accomplish this, create a new listener in the FavoritesManagerEditPart to refresh the edit parts based upon the model changes
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private final FavoritesManagerListener modelListener = new FavoritesManagerListener() { public void favoritesChanged(FavoritesManagerEvent event) { refresh(); } };
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When a model change occurs, the edit part should act accordingly by refreshing whatever has changed from the model For simplicity, our model listener described above uses the refresh() method, which is appropriate for small to medium sized models As models become larger, the time to execute the refresh() method increases in a linear fashion If at some point performance becomes sluggish, consider using explicit calls to addChild() and removeChild() rather than calling refresh() Edit parts have the methods activate() and deactivate() which are called when the edit part is added and removed These methods provide the ideal place to add and remove model listeners Add the following methods to FavoritesManagerEditPart so that it will receive notifications as the model changes
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public void activate() {
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superactivate(); getFavoritesManager()addFavoritesManagerListener(modelListener); } public void deactivate() { getFavoritesManager()removeFavoritesManagerListener(modelListener); superdeactivate(); }
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The resource and favorites items in our model are immutable so there is no need for additional listeners If either the resource or favorites item model objects did change, we would need to add similar methods to the corresponding edit parts so that the model changes could be instantly reflected in the view
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CHAPTER 20 GEF: Graphical Editing Framework
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While displaying graphical information is good, being able to manipulate that graphical information is even better With a bit more work, GEF provides users with the ability to interact with the figures in a GEF canvas In this section we move beyond the Favorites GEF View to a Favorites GEF Editor (see Figure 20 4)
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Figure 20 5 Favorites GEF Editor with flyout palette
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2061 Editor Input
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Per Section 84, Editor Lifecycle, on page 378, each editor is initialized with an editor input, and a GEF editor is no exception The editor input provides with the model, or in our case, an instance of FavoritesManager Create a new subclass of IEditorInput containing our model Editors are typically built to modify some file type, but our model is not stored in a workspace file and does not appear in the Package Explorer view In our editor input class, the exists() method returns false indicating the the input is not from a workspace file, and the getPersistable() method returns null indicating that the model is not persisted in a workspace file
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public class FavoritesGEFEditorInput implements IEditorInput { private final FavoritesManager model; public FavoritesGEFEditorInput(FavoritesManager model) {
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206 GEF in an Eclipse Editor
thismodel = model; } public FavoritesManager getModel() { return model; } public boolean exists() { return false; } public ImageDescriptor getImageDescriptor() { return null; } public String getName() { return "Favorites GEF Editor"; } public IPersistableElement getPersistable() { return null; } public String getToolTipText() { return "Favorites GEF Editor"; } public Object getAdapter(Class adapter) { return null; } }
2062 FavoritesManagerEditPart revisited
We reuse FavoritesManagerEditPart in the editor as we were using it in the view For the purposes of this example, we want to distinguish between these two different uses To accomplish this, several code changes must be made Start by adding editable as a constructor argument and a new field in FavoritesManagerEditPart
private final boolean editable; public FavoritesManagerEditPart(FavoritesManager manager, boolean editable) { setModel(manager); thiseditable = editable; }
This change requires that FavoritesEditPartFactory be modified to have an editable constructor argument and field as well
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CHAPTER 20 GEF: Graphical Editing Framework
private final boolean editable; public FavoritesEditPartFactory(boolean editable) { thiseditable = editable; } public EditPart createEditPart(EditPart context, Object model) { if (model instanceof FavoritesManager) return new FavoritesManagerEditPart((FavoritesManager) model, editable); // the rest of the method is unchanged
Finally, the setEditPartFactory statement in the createPartControl method of FavoritesGEFView must be modified to pass false
graphicalViewersetEditPartFactory(new FavoritesEditPartFactory(false));