[GEF] Remove redundant Handle class

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/gef/policy/OpenErrorLogEditPolicy.java

@@ -15,6 +15,7 @@
 import org.eclipse.wb.core.gef.part.AbstractComponentEditPart;
 import org.eclipse.wb.core.model.JavaInfo;
 import org.eclipse.wb.draw2d.FigureUtils;
+import org.eclipse.wb.gef.graphical.handles.DesignHandle;
 import org.eclipse.wb.internal.core.DesignerPlugin;
 import org.eclipse.wb.internal.core.editor.actions.errors.ErrorsAction;
 import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
@@ -114,7 +115,7 @@ public void relocate(IFigure target) {
 				target.setBounds(new Rectangle(5, componentArea.bottom() - 5 - 16, 16, 16));
 			}
 		};
-		m_figure = new org.eclipse.wb.gef.graphical.handles.Handle(m_editPart, locator) {
+		m_figure = new DesignHandle(m_editPart, locator) {
 			@Override
 			protected void paintClientArea(Graphics graphics) {
 				Image icon = DesignerPlugin.getImage("actions/errors/errors.gif");

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/handles/DesignHandle.java

@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * 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
+ * https://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Google, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.wb.gef.graphical.handles;
+
+import org.eclipse.draw2d.Locator;
+import org.eclipse.gef.DragTracker;
+import org.eclipse.gef.GraphicalEditPart;
+import org.eclipse.gef.Tool;
+import org.eclipse.gef.handles.AbstractHandle;
+
+/**
+ * {@link Handle} will add an {@link IAncestorListener} to the owner's figure, and will
+ * automatically revalidate this handle whenever the owner's figure moves.
+ *
+ * @author lobas_av
+ * @coverage gef.graphical
+ */
+public abstract class DesignHandle extends AbstractHandle {
+
+	////////////////////////////////////////////////////////////////////////////
+	//
+	// Constructor
+	//
+	////////////////////////////////////////////////////////////////////////////
+	/**
+	 * Creates a handle for the given <code>{@link GraphicalEditPart}</code> using the given
+	 * <code>{@link Locator}</code>.
+	 */
+	public DesignHandle(GraphicalEditPart owner, Locator locator) {
+		super(owner, locator);
+	}
+
+	/**
+	 * Creates a new drag tracker {@link Tool} to be returned by {@link #getDragTracker()}.
+	 */
+	@Override
+	protected final DragTracker createDragTracker() {
+		return null;
+	}
+}

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/handles/MoveHandle.java

@@ -26,7 +26,7 @@
  * @author lobas_av
  * @coverage gef.graphical
  */
-public class MoveHandle extends Handle {
+public class MoveHandle extends DesignHandle {
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructors

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/handles/SideResizeHandle.java

@@ -27,7 +27,7 @@
  * @author lobas_av
  * @coverage gef.graphical
  */
-public class SideResizeHandle extends Handle {
+public class SideResizeHandle extends DesignHandle {
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Constructor

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/handles/SquareHandle.java

@@ -27,7 +27,7 @@
  * @author lobas_av
  * @coverage gef.graphical
  */
-public abstract class SquareHandle extends Handle {
+public abstract class SquareHandle extends DesignHandle {
 	/**
 	 * The default size for square handles.
 	 */

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/rcp/perspective/AbstractPartSelectionEditPolicy.java

@@ -14,6 +14,7 @@
 
 import org.eclipse.wb.core.gef.command.EditCommand;
 import org.eclipse.wb.draw2d.FigureUtils;
+import org.eclipse.wb.gef.graphical.handles.DesignHandle;
 import org.eclipse.wb.gef.graphical.handles.MoveHandle;
 import org.eclipse.wb.gef.graphical.policies.SelectionEditPolicy;
 import org.eclipse.wb.gef.graphical.tools.ResizeTracker;
@@ -78,7 +79,7 @@ protected List<Handle> createStaticHandles() {
 			return Collections.emptyList();
 		}
 		// prepare handle
-		org.eclipse.wb.gef.graphical.handles.Handle resizeHandle = new org.eclipse.wb.gef.graphical.handles.Handle(getHost(), target -> {
+		DesignHandle resizeHandle = new DesignHandle(getHost(), target -> {
 			// prepare bounds (relative to page)
 			Rectangle bounds = m_line.getBounds().getCopy();
 			if (m_line.isHorizontal()) {

org.eclipse.wb.tests/src/org/eclipse/wb/tests/designer/editor/DesignerEditorTestCase.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
@@ -230,6 +230,10 @@ protected void fetchDesignViewers() {
 					ReflectionUtils.getFieldObject(designComposite, "m_viewersComposite");
 			m_viewerCanvas =
 					(GraphicalViewer) ReflectionUtils.getFieldObject(viewersComposite, "m_viewer");
+			m_viewerCanvas.addSelectionChangedListener(event -> {
+				// wait for handlers to update after selection
+				m_viewerCanvas.getControl().getLightweightSystem().getUpdateManager().performUpdate();
+			});
 			assertNotNull(m_viewerCanvas);
 			assertNotNull(m_viewerCanvas.getEditDomain());
 			// prepare sender

org.eclipse.wb.tests/src/org/eclipse/wb/tests/gef/GefCursorTestCase.java

@@ -70,6 +70,10 @@ public void setUp() throws Exception {
 		m_actualLogger = new CursorLogger();
 		m_viewer = new TestGraphicalViewer(m_shell, m_actualLogger);
 		m_viewer.getControl().setSize(500, 400);
+		m_viewer.addSelectionChangedListener(event -> {
+			// wait for handlers to update after selection
+			m_viewer.getControl().getLightweightSystem().getUpdateManager().performUpdate();
+		});
 		// set edit domain
 		m_domain = new EditDomain() {
 			@Override

org.eclipse.wb.tests/src/org/eclipse/wb/tests/gef/SelectionToolTest.java

@@ -231,6 +231,7 @@ public void test_DragTracker_MoveHandle() throws Exception {
 		//
 		MoveHandle handle = new MoveHandle(childEditPart);
 		handle.setDragTracker(new RequestDragTracker(childEditPart));
+		handle.validate();
 		LayerManager.Helper.find(m_viewer).getLayer(LayerConstants.HANDLE_LAYER).add(handle);
 		//
 		RequestsLogger expectedLogger = new RequestsLogger();