| /******************************************************************************* |
| * Copyright (c) 2006 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.internal.handlers; |
| |
| import java.util.Iterator; |
| |
| import org.eclipse.core.commands.IHandler; |
| import org.eclipse.core.expressions.Expression; |
| import org.eclipse.ui.handlers.IHandlerActivation; |
| import org.eclipse.ui.handlers.IHandlerService; |
| import org.eclipse.ui.internal.services.INestable; |
| |
| /** |
| * <p> |
| * A handler service which delegates almost all responsibility to the parent |
| * service. It is capable of being nested inside a component that is not |
| * recognizable by the "sources" event mechanism. This means that the handlers |
| * must be activated and deactivated manually. |
| * </p> |
| * <p> |
| * This class is not intended for use outside of the |
| * <code>org.eclipse.ui.workbench</code> plug-in. |
| * </p> |
| * |
| * @since 3.2 |
| */ |
| public final class NestableHandlerService extends SlaveHandlerService implements |
| INestable { |
| |
| /** |
| * Whether the component with which this service is associated is active. |
| */ |
| private boolean active = false; |
| |
| /** |
| * Constructs a new instance. |
| * |
| * @param parentHandlerService |
| * The parent handler service for this slave; must not be |
| * <code>null</code>. |
| * @param defaultExpression |
| * The default expression to use if none is provided. This is |
| * primarily used for conflict resolution. This value may be |
| * <code>null</code>. |
| */ |
| public NestableHandlerService(final IHandlerService parentHandlerService, |
| final Expression defaultExpression) { |
| super(parentHandlerService, defaultExpression); |
| } |
| |
| public final void activate() { |
| if (active) { |
| return; |
| } |
| |
| final Iterator localActivationItr = localActivationsToParentActivations |
| .keySet().iterator(); |
| while (localActivationItr.hasNext()) { |
| final Object object = localActivationItr.next(); |
| if (object instanceof IHandlerActivation) { |
| final IHandlerActivation localActivation = (IHandlerActivation) object; |
| final String commandId = localActivation.getCommandId(); |
| final IHandler handler = localActivation.getHandler(); |
| final IHandlerActivation parentActivation = parent |
| .activateHandler(commandId, handler, defaultExpression); |
| parentActivations.add(parentActivation); |
| localActivationsToParentActivations.put(localActivation, |
| parentActivation); |
| } |
| } |
| |
| active = true; |
| } |
| |
| protected final IHandlerActivation doActivation( |
| final IHandlerActivation localActivation) { |
| final IHandlerActivation parentActivation; |
| if (active) { |
| parentActivation = parent.activateHandler(localActivation); |
| parentActivations.add(parentActivation); |
| } else { |
| parentActivation = null; |
| } |
| localActivationsToParentActivations.put(localActivation, |
| parentActivation); |
| return localActivation; |
| } |
| |
| public final void deactivate() { |
| if (!active) { |
| return; |
| } |
| |
| deactivateHandlers(parentActivations); |
| parentActivations.clear(); |
| |
| final Iterator localActivationItr = localActivationsToParentActivations |
| .keySet().iterator(); |
| while (localActivationItr.hasNext()) { |
| final Object object = localActivationItr.next(); |
| localActivationsToParentActivations.put(object, null); |
| } |
| |
| active = false; |
| } |
| } |
| |