| /******************************************************************************* |
| * Copyright (c) 2006 Sybase, Inc. and others. |
| * |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Sybase, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.pagedesigner.ui.common; |
| |
| import org.eclipse.swt.events.ShellAdapter; |
| import org.eclipse.swt.events.ShellEvent; |
| import org.eclipse.ui.IPartListener; |
| import org.eclipse.ui.IWorkbenchPart; |
| |
| /** |
| * @author mengbo |
| */ |
| public abstract class PartActivationHandler extends ShellAdapter implements |
| IPartListener { |
| private IWorkbenchPart _activePart; |
| |
| private boolean _isHandlingActivation = false; |
| |
| private IWorkbenchPart _trace; |
| |
| /** |
| * @param part |
| */ |
| public PartActivationHandler(IWorkbenchPart part) { |
| _trace = part; |
| } |
| |
| /** |
| * this method is called when the specified part is activated. |
| */ |
| public abstract void handleActivation(); |
| |
| private void internalHandleActivation() { |
| |
| if (_isHandlingActivation) |
| return; |
| |
| if (_activePart == _trace) { |
| _isHandlingActivation = true; |
| try { |
| handleActivation(); |
| } finally { |
| _isHandlingActivation = false; |
| } |
| } |
| } |
| |
| /** |
| * @see IPartListener#partActivated(IWorkbenchPart) |
| */ |
| public void partActivated(IWorkbenchPart part) { |
| _activePart = part; |
| internalHandleActivation(); |
| } |
| |
| /** |
| * @see IPartListener#partBroughtToTop(IWorkbenchPart) |
| */ |
| public void partBroughtToTop(IWorkbenchPart part) { |
| // do nothing |
| } |
| |
| /** |
| * @see IPartListener#partClosed(IWorkbenchPart) |
| */ |
| public void partClosed(IWorkbenchPart part) { |
| // do nothing |
| } |
| |
| /** |
| * @see IPartListener#partDeactivated(IWorkbenchPart) |
| */ |
| public void partDeactivated(IWorkbenchPart part) { |
| _activePart = null; |
| } |
| |
| /** |
| * @see IPartListener#partOpened(IWorkbenchPart) |
| */ |
| public void partOpened(IWorkbenchPart part) { |
| // do nothing |
| } |
| |
| /* |
| * @see ShellListener#shellActivated(ShellEvent) |
| */ |
| public void shellActivated(ShellEvent e) { |
| internalHandleActivation(); |
| } |
| } |