| /******************************************************************************* |
| * Copyright (c) 2005, 2015 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.handlers; |
| |
| import org.eclipse.core.commands.IHandler; |
| import org.eclipse.ui.commands.HandlerEvent; |
| import org.eclipse.ui.commands.IHandlerListener; |
| import org.eclipse.ui.internal.commands.ILegacyAttributeNames; |
| |
| /** |
| * A wrapper so that the new handler listener can work with legacy handlers. |
| * This class is only intended for backward compatibility with Eclipse 3.0. |
| * |
| * @since 3.1 |
| */ |
| public final class LegacyHandlerListenerWrapper implements IHandlerListener { |
| |
| /** |
| * The handler on which this listener is listening; never <code>null</code>. |
| */ |
| private final IHandler handler; |
| |
| /** |
| * The wrapped listener; never <code>null</code>. |
| */ |
| private final org.eclipse.core.commands.IHandlerListener listener; |
| |
| /** |
| * Constructs a new instance of <code>LegacyHandlerListenerWrapper</code>. |
| * |
| * @param listener The listener to wrap; must not be <code>null</code>. |
| */ |
| public LegacyHandlerListenerWrapper(final IHandler handler, |
| final org.eclipse.core.commands.IHandlerListener listener) { |
| if (handler == null) { |
| throw new NullPointerException("A listener wrapper cannot be created on a null handler"); //$NON-NLS-1$ |
| } |
| |
| if (listener == null) { |
| throw new NullPointerException("A listener wrapper cannot be created on a null listener"); //$NON-NLS-1$ |
| } |
| |
| this.handler = handler; |
| this.listener = listener; |
| } |
| |
| @Override |
| public void handlerChanged(HandlerEvent event) { |
| final boolean enabledChanged = ((Boolean) event.getPreviousAttributeValuesByName() |
| .get(ILegacyAttributeNames.ENABLED)).booleanValue() != handler.isEnabled(); |
| final boolean handledChanged = ((Boolean) event.getPreviousAttributeValuesByName() |
| .get(ILegacyAttributeNames.HANDLED)).booleanValue() != handler.isHandled(); |
| listener.handlerChanged(new org.eclipse.core.commands.HandlerEvent(handler, enabledChanged, handledChanged)); |
| } |
| } |