| /******************************************************************************* |
| * 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.navigator; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.core.runtime.ListenerList; |
| import org.eclipse.ui.navigator.IExtensionActivationListener; |
| import org.eclipse.ui.navigator.INavigatorActivationService; |
| import org.eclipse.ui.navigator.INavigatorContentDescriptor; |
| import org.eclipse.ui.navigator.INavigatorContentService; |
| import org.eclipse.ui.navigator.INavigatorViewerDescriptor; |
| |
| /** |
| * Stores information about programmatic bindings and activation settings. |
| * |
| */ |
| public class VisibilityAssistant implements IExtensionActivationListener { |
| |
| private final INavigatorViewerDescriptor viewerDescriptor; |
| |
| private final Set programmaticVisibilityBindings = new HashSet(); |
| |
| private final Set programmaticRootBindings = new HashSet(); |
| |
| private final ListenerList listeners = new ListenerList(); |
| |
| private final INavigatorActivationService activationService; |
| |
| /** |
| * Notifies clients of changes in extension visibility or activation. |
| * |
| */ |
| public interface VisibilityListener { |
| |
| /** |
| * Respond to the change in visibility or activation. |
| * |
| */ |
| void onVisibilityOrActivationChange(); |
| } |
| |
| /** |
| * Create a visibility assistant for the given viewer descriptor. |
| * |
| * @param aViewerDescriptor |
| * A non-nullviewer descriptor. |
| * @param anActivationService |
| * The activation service associated with the content service. |
| */ |
| public VisibilityAssistant(INavigatorViewerDescriptor aViewerDescriptor, |
| INavigatorActivationService anActivationService) { |
| Assert.isNotNull(aViewerDescriptor); |
| viewerDescriptor = aViewerDescriptor; |
| |
| activationService = anActivationService; |
| activationService.addExtensionActivationListener(this); |
| } |
| |
| /** |
| * Dispose of any resources held onto by this assistant. |
| * |
| */ |
| public void dispose() { |
| activationService.removeExtensionActivationListener(this); |
| } |
| |
| /** |
| * |
| * @param theExtensions |
| * The extensions that should be made visible to the viewer. |
| * @param isRoot |
| */ |
| public void bindExtensions(String[] theExtensions, boolean isRoot) { |
| if (theExtensions == null) { |
| return; |
| } |
| for (int i = 0; i < theExtensions.length; i++) { |
| programmaticVisibilityBindings.add(theExtensions[i]); |
| if (isRoot) { |
| programmaticRootBindings.add(theExtensions[i]); |
| } |
| } |
| notifyClients(); |
| } |
| |
| /** |
| * Add a listener to be notified when the visibility or activation state |
| * associated with this assistant changes. |
| * |
| * @param aListener |
| * a listener to be notified when the visibility or activation |
| * state associated with this assistant changes. |
| */ |
| public void addListener(VisibilityListener aListener) { |
| listeners.add(aListener); |
| } |
| |
| /** |
| * Remove a listener to be notified when the visibility or activation state |
| * associated with this assistant changes. |
| * |
| * @param aListener |
| * a listener to be notified when the visibility or activation |
| * state associated with this assistant changes. |
| */ |
| public void removeListener(VisibilityListener aListener) { |
| listeners.remove(aListener); |
| } |
| |
| private void notifyClients() { |
| Object[] clients = listeners.getListeners(); |
| for (int i = 0; i < clients.length; i++) { |
| ((VisibilityListener) clients[i]).onVisibilityOrActivationChange(); |
| } |
| } |
| |
| /** |
| * |
| * @param aContentDescriptor |
| * The content descriptor of inquiry |
| * @return True if and only if the content descriptor is <i>active</i> and |
| * <i>visible</i> for the viewer descriptor and enabled for the |
| * given element. |
| */ |
| public boolean isVisibleAndActive( |
| INavigatorContentDescriptor aContentDescriptor) { |
| return isActive(aContentDescriptor) && isVisible(aContentDescriptor); |
| } |
| |
| /** |
| * |
| * @param aContentDescriptor |
| * The content descriptor of inquiry |
| * @return True if and only if the given extension is <i>active</i> |
| * |
| * @see INavigatorContentService For more information on what <i>active</i> |
| * means. |
| * @see INavigatorActivationService#activateExtensions(String[], boolean) |
| * @see INavigatorActivationService#deactivateExtensions(String[], boolean) |
| */ |
| public boolean isActive(INavigatorContentDescriptor aContentDescriptor) { |
| return activationService.isNavigatorExtensionActive(aContentDescriptor |
| .getId()); |
| } |
| |
| /** |
| * |
| * @param aContentExtensionId |
| * The unique id of the content extension |
| * @return True if and only if the given extension is <i>active</i> |
| * @see INavigatorContentService For more information on what <i>active</i> |
| * means. |
| * @see INavigatorActivationService#activateExtensions(String[], boolean) |
| * @see INavigatorActivationService#deactivateExtensions(String[], boolean) |
| */ |
| public boolean isActive(String aContentExtensionId) { |
| return activationService |
| .isNavigatorExtensionActive(aContentExtensionId); |
| } |
| |
| /** |
| * |
| * @param aContentDescriptor |
| * The content descriptor of inquiry |
| * @return True if and only if the given content extension is declaratively |
| * or programmatically made visible to the viewer. |
| * @see INavigatorContentService#bindExtensions(String[], boolean) For more |
| * information on what <i>visible</i> means. |
| */ |
| public boolean isVisible(INavigatorContentDescriptor aContentDescriptor) { |
| return programmaticVisibilityBindings.contains(aContentDescriptor |
| .getId()) |
| || viewerDescriptor |
| .isVisibleContentExtension(aContentDescriptor.getId()); |
| } |
| |
| /** |
| * |
| * @param aContentExtensionId |
| * The unique id of the content extension |
| * @return True if and only if the given content extension is declaratively |
| * or programmatically made visible to the viewer. |
| * @see INavigatorContentService#bindExtensions(String[], boolean) For more |
| * information on what <i>visible</i> means. |
| */ |
| public boolean isVisible(String aContentExtensionId) { |
| return programmaticVisibilityBindings.contains(aContentExtensionId) |
| || viewerDescriptor |
| .isVisibleContentExtension(aContentExtensionId); |
| } |
| |
| /** |
| * Return whether the given content extension is a root extension. |
| * |
| * @param aContentExtensionId |
| * the id of the content extension. |
| * @return whether the given content extension is a root extension |
| */ |
| public boolean isRootExtension(String aContentExtensionId) { |
| return programmaticRootBindings.contains(aContentExtensionId) |
| || viewerDescriptor.isRootExtension(aContentExtensionId); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.ui.navigator.IExtensionActivationListener#onExtensionActivation(java.lang.String, |
| * java.lang.String[], boolean) |
| */ |
| public void onExtensionActivation(String aViewerId, |
| String[] theNavigatorExtensionIds, boolean isActive) { |
| if (aViewerId.equals(viewerDescriptor.getViewerId())) { |
| notifyClients(); |
| } |
| |
| } |
| |
| } |