Developing a DSL Graphical Notation - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 127

Refactoring the Editor

Back to our EMF-generated RequirementsEditor , we see that each page is
created as an anonymous subclass of ViewerPane . This causes problems when
trying to integrate our diagram into a page, so we can create an abstract
RequirementsEditorPart class to use as a superclass for converting each
page into its own EditorPart . Create the new class in the org.eclipse.
requirements.presentation package that extends EditorPart and imple-
ments IMenuListener and IEditingDomainProvider as follows:

public abstract class RequirementsEditorPart extends EditorPart

implements IMenuListener, IEditingDomainProvider {

protected RequirementsEditor parentEditor;

public RequirementsEditorPart(RequirementsEditor parent) {
super ();
this .parentEditor = parent;

}

protected static String getString(String key) {
return RequirementsEditorPlugin.INSTANCE.getString(key);

}

public EditingDomain getEditingDomain() {
return parentEditor.getEditingDomain();

}

protected BasicCommandStack getCommandStack() {
return ((BasicCommandStack) getEditingDomain().getCommandStack());

}

protected AdapterFactory getAdapterFactory() {
return ((AdapterFactoryEditingDomain) ((FileEditorInputProxy)
getEditorInput()).getEditingDomain()).getAdapterFactory();
}

protected void createContextMenuFor(StructuredViewer viewer) {
MenuManager contextMenu = new MenuManager("#PopUp");
contextMenu.add( new Separator("additions"));
contextMenu.setRemoveAllWhenShown( true );
contextMenu.addMenuListener( this );
Menu menu = contextMenu.createContextMenu(viewer.getControl());
viewer.getControl().setMenu(menu);
getSite().registerContextMenu(contextMenu, new
UnwrappingSelectionProvider(viewer));

int dndOperations = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK;
Transfer[] transfers = new Transfer[] {
LocalTransfer.getInstance() };
viewer.addDragSupport(dndOperations, transfers, new
ViewerDragAdapter(viewer));