bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/navigator/GotoActionGroup.java

package org.eclipse.ui.views.navigator;

/**********************************************************************
Copyright (c) 2000, 2001, 2002, International Business Machines Corp and others.
All rights reserved.   This program and the accompanying materials
are made available under the terms of the Common Public License v0.5
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v05.html
 
Contributors:
**********************************************************************/

import org.eclipse.core.resources.*;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.actions.ActionContext;
import org.eclipse.ui.views.framelist.*;

/**
 * This is the action group for the goto actions.
 */
public class GotoActionGroup extends ResourceNavigatorActionGroup {

	private BackAction backAction;
	private ForwardAction forwardAction;
	private GoIntoAction goIntoAction;
	private UpAction upAction;
	private GotoResourceAction goToResourceAction;
	private IResourceChangeListener resourceChangeListener;
	
	public GotoActionGroup(IResourceNavigator navigator) {
		super(navigator);
	
		// Listen for project open/close changes. Fixes bug 5958
		resourceChangeListener = new IResourceChangeListener() {
			public void resourceChanged(IResourceChangeEvent event) {
				updateActionBars();
			}
		};
		ResourcesPlugin.getWorkspace().addResourceChangeListener(resourceChangeListener);
	}

	/**
	 * @see org.eclipse.ui.actions.ActionGroup#dispose()
	 */
	public void dispose() {
		ResourcesPlugin.getWorkspace().removeResourceChangeListener(resourceChangeListener);
		super.dispose();
	}

	public void fillContextMenu(IMenuManager menu) {
		IStructuredSelection selection =
			(IStructuredSelection) getContext().getSelection();
		if (selection.size() == 1) {
			if (ResourceSelectionUtil.allResourcesAreOfType(selection, IResource.FOLDER)) {
				menu.add(goIntoAction);
			} else {
				IStructuredSelection resourceSelection = ResourceSelectionUtil.allResources(selection, IResource.PROJECT);
				if (resourceSelection != null && !resourceSelection.isEmpty()) {
					IProject project = (IProject)resourceSelection.getFirstElement();
					if (project.isOpen())
						menu.add(goIntoAction);
				}
			}
		}
	}
	
	public void fillActionBars(IActionBars actionBars) {
		actionBars.setGlobalActionHandler(
			IWorkbenchActionConstants.GO_INTO,
			goIntoAction);
		actionBars.setGlobalActionHandler(
			IWorkbenchActionConstants.BACK,
			backAction);
		actionBars.setGlobalActionHandler(
			IWorkbenchActionConstants.FORWARD,
			forwardAction);
		actionBars.setGlobalActionHandler(
			IWorkbenchActionConstants.UP,
			upAction);
		actionBars.setGlobalActionHandler(
			IWorkbenchActionConstants.GO_TO_RESOURCE,
			goToResourceAction);
			
		IToolBarManager toolBar = actionBars.getToolBarManager();
		toolBar.add(backAction);
		toolBar.add(forwardAction);
		toolBar.add(upAction);
	}

	protected void makeActions() {
		FrameList frameList = navigator.getFrameList();
		goIntoAction = new GoIntoAction(frameList);
		backAction = new BackAction(frameList);
		forwardAction = new ForwardAction(frameList);
		upAction = new UpAction(frameList);
		goToResourceAction = new GotoResourceAction(navigator, ResourceNavigatorMessages.getString("GoToResource.label")); //$NON-NLS-1$
	}	

	public void updateActionBars() {
		ActionContext context = getContext();
		boolean enable = false;

		// Fix for bug 26126. Resource change listener could call
		// updateActionBars without a context being set.
		// This should never happen because resource navigator sets
		// context immediately after this group is created.
		if (context != null) {
			IStructuredSelection selection =
				(IStructuredSelection) context.getSelection();
	
			if (selection.size() == 1) {
				Object object = selection.getFirstElement();
				if (object instanceof IProject) {
					enable = ((IProject) object).isOpen();
				}
				else
				if (object instanceof IFolder) {
					enable = true;
				}
			}
		}	
		goIntoAction.setEnabled(enable);
		// the rest of the actions update by listening to frame list changes
	}
}