| /******************************************************************************* |
| * Copyright (c) 2006, 2007 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.ui.tests.menus; |
| |
| import org.eclipse.core.commands.AbstractHandler; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.commands.HandlerEvent; |
| import org.eclipse.core.commands.contexts.ContextManagerEvent; |
| import org.eclipse.core.commands.contexts.IContextManagerListener; |
| import org.eclipse.jface.dialogs.MessageDialog; |
| import org.eclipse.ui.IWorkbenchWindow; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.contexts.IContextService; |
| import org.eclipse.ui.handlers.HandlerUtil; |
| import org.eclipse.ui.services.IServiceLocator; |
| |
| /** |
| * @since 3.3 |
| * |
| */ |
| public class ChangeEnablementHandler extends AbstractHandler { |
| private static final String CONTEXT_ID = "org.eclipse.ui.menus.contexts.test2"; |
| |
| private IContextManagerListener fContextManagerListener; |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent) |
| */ |
| public Object execute(ExecutionEvent event) throws ExecutionException { |
| IWorkbenchWindow window = HandlerUtil |
| .getActiveWorkbenchWindowChecked(event); |
| init(PlatformUI.getWorkbench()); |
| |
| MessageDialog.openInformation(window.getShell(), "Hello", |
| "Hello context change command!"); |
| return null; |
| } |
| |
| private void init(IServiceLocator serviceLocator) { |
| if (fContextManagerListener == null) { |
| IContextService service = (IContextService) serviceLocator |
| .getService(IContextService.class); |
| service.addContextManagerListener(getContextListener()); |
| } |
| } |
| |
| /** |
| * @return |
| */ |
| private IContextManagerListener getContextListener() { |
| if (fContextManagerListener == null) { |
| fContextManagerListener = new IContextManagerListener() { |
| public void contextManagerChanged( |
| ContextManagerEvent contextManagerEvent) { |
| if (contextManagerEvent.isActiveContextsChanged()) { |
| setEnabled(contextManagerEvent.getContextManager() |
| .getActiveContextIds().contains(CONTEXT_ID)); |
| } |
| } |
| }; |
| } |
| return fContextManagerListener; |
| } |
| |
| boolean fEnabled = true; |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.commands.AbstractHandler#isEnabled() |
| */ |
| public boolean isEnabled() { |
| return fEnabled; |
| } |
| |
| private void setEnabled(boolean enabled) { |
| if (fEnabled != enabled) { |
| fEnabled = enabled; |
| fireHandlerChanged(new HandlerEvent(this, true, false)); |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.commands.AbstractHandler#dispose() |
| */ |
| public void dispose() { |
| if (fContextManagerListener != null) { |
| IContextService service = (IContextService) PlatformUI |
| .getWorkbench().getService(IContextService.class); |
| service.removeContextManagerListener(fContextManagerListener); |
| fContextManagerListener = null; |
| } |
| } |
| } |