[GEF] Use EditPartViewer interface when creating UI actions

The `IEditPartViewer` is a WindowBuilder-specific subclass of the GEF
EditPartViewer. But none of its methods are required when creating these
actions.

By removing it now, we avoid type-cast errors when using those actions
for pure GEF viewers.

Author: ptziegler

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/editor/JavaDesignComposite.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -16,14 +16,14 @@
 import org.eclipse.wb.core.model.JavaInfo;
 import org.eclipse.wb.core.model.ObjectInfo;
 import org.eclipse.wb.gef.core.ICommandExceptionHandler;
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.internal.core.editor.actions.DesignPageActions;
 import org.eclipse.wb.internal.core.editor.actions.SelectSupport;
 import org.eclipse.wb.internal.core.editor.palette.DesignerPalette;
 import org.eclipse.wb.internal.core.model.DesignRootObject;
 import org.eclipse.wb.internal.core.utils.Debug;
 
 import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.DisposeEvent;
@@ -62,7 +62,7 @@ public JavaDesignComposite(Composite parent,
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	protected void createDesignActions() {
-		IEditPartViewer treeViewer = m_componentsComposite.getTreeViewer();
+		EditPartViewer treeViewer = m_componentsComposite.getTreeViewer();
 		m_pageActions = new DesignPageActions(m_editorPart, treeViewer);
 		m_viewer.setContextMenu(new DesignContextMenuProvider(m_viewer, m_pageActions));
 		// install dispose listener

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/editor/actions/CopyAction.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -13,13 +13,13 @@
 package org.eclipse.wb.internal.core.editor.actions;
 
 import org.eclipse.wb.core.model.JavaInfo;
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.internal.core.model.clipboard.JavaInfoMemento;
 import org.eclipse.wb.internal.core.model.clipboard.JavaInfoMementoTransfer;
 import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
 import org.eclipse.wb.internal.core.utils.execution.RunnableEx;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
@@ -39,14 +39,14 @@
  * @coverage core.editor.action
  */
 public class CopyAction extends Action {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public CopyAction(IEditPartViewer viewer) {
+	public CopyAction(EditPartViewer viewer) {
 		m_viewer = viewer;
 		m_viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 			@Override

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/editor/actions/CutAction.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -12,12 +12,12 @@
  *******************************************************************************/
 package org.eclipse.wb.internal.core.editor.actions;
 
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.internal.core.model.clipboard.JavaInfoMemento;
 import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
 import org.eclipse.wb.internal.core.utils.execution.RunnableEx;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.gef.commands.Command;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
@@ -33,14 +33,14 @@
  * @coverage core.editor.action
  */
 public class CutAction extends Action {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public CutAction(IEditPartViewer viewer) {
+	public CutAction(EditPartViewer viewer) {
 		m_viewer = viewer;
 		m_viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 			@Override

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/editor/actions/DesignPageActions.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -18,6 +18,7 @@
 import org.eclipse.wb.internal.core.editor.actions.assistant.LayoutAssistantAction;
 import org.eclipse.wb.internal.core.editor.actions.errors.ErrorsAction;
 
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IEditorPart;
@@ -34,7 +35,7 @@
  * @coverage core.editor.action
  */
 public final class DesignPageActions {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 	private final IActionBars m_actionBars;
 	////////////////////////////////////////////////////////////////////////////
 	//
@@ -63,7 +64,7 @@ public final class DesignPageActions {
 	 * @param actionBars
 	 *          the editor site {@link IActionBars}.
 	 */
-	public DesignPageActions(IEditorPart editor, IEditPartViewer viewer) {
+	public DesignPageActions(IEditorPart editor, EditPartViewer viewer) {
 		m_viewer = viewer;
 		m_actionBars = editor.getEditorSite().getActionBars();
 		//

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/editor/actions/PasteAction.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -12,11 +12,11 @@
  *******************************************************************************/
 package org.eclipse.wb.internal.core.editor.actions;
 
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.gef.core.tools.PasteTool;
 import org.eclipse.wb.internal.core.model.clipboard.JavaInfoMemento;
 import org.eclipse.wb.internal.core.model.clipboard.JavaInfoMementoTransfer;
 
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.Action;
 import org.eclipse.swt.dnd.Clipboard;
 import org.eclipse.swt.widgets.Control;
@@ -33,14 +33,14 @@
  * @coverage core.editor.action
  */
 public class PasteAction extends Action {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public PasteAction(IEditPartViewer viewer) {
+	public PasteAction(EditPartViewer viewer) {
 		m_viewer = viewer;
 		// copy presentation
 		ActionUtils.copyPresentation(this, ActionFactory.PASTE);

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/editor/actions/DeleteAction.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -15,9 +15,9 @@
 import org.eclipse.wb.core.gef.command.CompoundEditCommand;
 import org.eclipse.wb.core.gef.command.EditCommand;
 import org.eclipse.wb.core.model.ObjectInfo;
-import org.eclipse.wb.gef.core.IEditPartViewer;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.gef.commands.Command;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
@@ -35,14 +35,14 @@
  * @coverage core.editor.action
  */
 public class DeleteAction extends Action {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public DeleteAction(IEditPartViewer viewer) {
+	public DeleteAction(EditPartViewer viewer) {
 		m_viewer = viewer;
 		m_viewer.addSelectionChangedListener(new ISelectionChangedListener() {
 			@Override

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/editor/actions/SelectSupport.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -15,7 +15,6 @@
 import org.eclipse.wb.core.editor.IContextMenuConstants;
 import org.eclipse.wb.core.model.ObjectInfo;
 import org.eclipse.wb.core.model.broadcast.ObjectEventListener;
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.internal.core.DesignerPlugin;
 import org.eclipse.wb.internal.core.EnvironmentUtils;
 import org.eclipse.wb.internal.core.model.ObjectInfoVisitor;
@@ -25,6 +24,7 @@
 import org.eclipse.wb.internal.core.utils.state.IDescriptionHelper;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.IMenuManager;
 import org.eclipse.jface.action.MenuManager;
 import org.eclipse.jface.viewers.StructuredSelection;
@@ -48,8 +48,8 @@
  */
 public final class SelectSupport {
 	private final ObjectInfo m_rootObject;
-	private final IEditPartViewer m_graphicalViewer;
-	private final IEditPartViewer m_treeViewer;
+	private final EditPartViewer m_graphicalViewer;
+	private final EditPartViewer m_treeViewer;
 	private final Set<ObjectInfo> m_selectedObjects = new HashSet<>();
 	private final Set<ObjectInfo> m_selectingSet = new LinkedHashSet<>();
 
@@ -59,8 +59,8 @@ public final class SelectSupport {
 	//
 	////////////////////////////////////////////////////////////////////////////
 	public SelectSupport(ObjectInfo rootObject,
-			IEditPartViewer graphicalViewer,
-			IEditPartViewer treeViewer) {
+			EditPartViewer graphicalViewer,
+			EditPartViewer treeViewer) {
 		m_rootObject = rootObject;
 		m_graphicalViewer = graphicalViewer;
 		m_treeViewer = treeViewer;
@@ -106,15 +106,15 @@ public void handleEvent(Event event) {
 	/**
 	 * Adds {@link SWT#KeyDown} listener for {@link Control} of viewer.
 	 */
-	private void addKeyDownListener(IEditPartViewer viewer) {
+	private void addKeyDownListener(EditPartViewer viewer) {
 		Control control = viewer.getControl();
 		control.addListener(SWT.KeyDown, m_keyListener);
 	}
 
 	/**
 	 * Removes {@link SWT#KeyDown} listener from {@link Control} of viewer.
 	 */
-	private void removeKeyDownListener(IEditPartViewer viewer) {
+	private void removeKeyDownListener(EditPartViewer viewer) {
 		Control control = viewer.getControl();
 		if (!control.isDisposed()) {
 			control.removeListener(SWT.KeyDown, m_keyListener);

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/editor/actions/assistant/LayoutAssistantAction.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -14,11 +14,11 @@
 
 import org.eclipse.wb.core.model.ObjectInfo;
 import org.eclipse.wb.core.model.broadcast.ObjectEventListener;
-import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.internal.core.DesignerPlugin;
 import org.eclipse.wb.internal.core.editor.Messages;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.IAction;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
@@ -42,15 +42,15 @@
  */
 public final class LayoutAssistantAction extends Action {
 	private final IEditorPart m_editor;
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 	private LayoutAssistantWindow m_assistantWindow;
 	private final IWorkbenchWindow m_workbenchWindow;
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public LayoutAssistantAction(IEditorPart editor, IEditPartViewer viewer) {
+	public LayoutAssistantAction(IEditorPart editor, EditPartViewer viewer) {
 		super(Messages.LayoutAssistantAction_text, IAction.AS_CHECK_BOX);
 		setToolTipText(Messages.LayoutAssistantAction_toolTip);
 		setImageDescriptor(DesignerPlugin.getImageDescriptor("actions/assistant/assistant.png"));

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/utils/gef/EditPartsContentProvider.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -15,6 +15,7 @@
 import org.eclipse.wb.gef.core.IEditPartViewer;
 
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.Viewer;
 
@@ -30,14 +31,14 @@
  * @coverage gef.core
  */
 public final class EditPartsContentProvider implements ITreeContentProvider {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public EditPartsContentProvider(IEditPartViewer viewer) {
+	public EditPartsContentProvider(EditPartViewer viewer) {
 		m_viewer = viewer;
 	}
 

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/utils/gef/EditPartsSelectionProvider.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -16,6 +16,7 @@
 
 import org.eclipse.draw2d.EventListenerList;
 import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPartViewer;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.ISelectionProvider;
@@ -34,7 +35,7 @@
  * @coverage gef.core
  */
 public final class EditPartsSelectionProvider implements ISelectionProvider {
-	private final IEditPartViewer m_viewer;
+	private final EditPartViewer m_viewer;
 	private final EventListenerList m_eventTable = new EventListenerList();
 	private final ISelectionChangedListener m_selectionListener = new ISelectionChangedListener() {
 		@Override
@@ -48,7 +49,7 @@ public void selectionChanged(SelectionChangedEvent event) {
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public EditPartsSelectionProvider(IEditPartViewer viewer) {
+	public EditPartsSelectionProvider(EditPartViewer viewer) {
 		m_viewer = viewer;
 	}