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/*******************************************************************************
* Copyright (c) 2007, 2011 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.compare.internal;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.compare.ICompareContainer;
import org.eclipse.core.expressions.Expression;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.commands.ActionHandler;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.*;
import org.eclipse.ui.handlers.IHandlerActivation;
import org.eclipse.ui.handlers.IHandlerService;
import org.eclipse.ui.services.IServiceLocator;
public class CompareHandlerService {
private final List fActivations = new ArrayList();
private final Expression fExpression;
private ICompareContainer fContainer;
private boolean fDisposed;
private List fPaneActivations = new ArrayList();
private IHandlerService fHandlerService;
public static CompareHandlerService createFor(ICompareContainer container, Shell shell) {
IServiceLocator serviceLocator = container.getServiceLocator();
if (serviceLocator != null) {
IHandlerService service = serviceLocator.getService(IHandlerService.class);
if (service != null)
return new CompareHandlerService(container, null);
}
if (container.getWorkbenchPart() == null && shell != null) {
// We're in a dialog so we can use an active shell expression
IHandlerService service = PlatformUI.getWorkbench().getService(IHandlerService.class);
if (service != null) {
Expression e = new ActiveShellExpression(shell);
return new CompareHandlerService(container, e);
}
}
return new CompareHandlerService(null, null);
}
private CompareHandlerService(ICompareContainer container,
Expression expression) {
fContainer = container;
fExpression = expression;
initialize();
}
public void registerAction(IAction action, String commandId) {
IHandlerService handlerService = getHandlerService();
if (handlerService == null)
return;
action.setActionDefinitionId(commandId);
IHandlerActivation activation;
if (fExpression == null) {
activation = handlerService.activateHandler(commandId, new ActionHandler(action));
} else {
activation = handlerService.activateHandler(commandId, new ActionHandler(action), fExpression);
}
if (activation != null) {
fActivations .add(activation);
}
}
private IHandlerService getHandlerService() {
if (fDisposed)
return null;
return fHandlerService;
}
private void initialize() {
if (fHandlerService == null) {
IServiceLocator serviceLocator = fContainer.getServiceLocator();
if (serviceLocator != null) {
IHandlerService service = serviceLocator.getService(IHandlerService.class);
if (service != null)
fHandlerService = service;
}
if (fHandlerService == null && fContainer.getWorkbenchPart() == null && fExpression != null) {
// We're in a dialog so we can use an active shell expression
IHandlerService service = PlatformUI.getWorkbench().getService(IHandlerService.class);
if (service != null) {
fHandlerService = service;
}
}
}
}
public void setGlobalActionHandler(String actionId, IAction actionHandler) {
IActionBars bars = getActionBars();
if (bars != null) {
bars.setGlobalActionHandler(actionId, actionHandler);
return;
} else if (fExpression != null && actionHandler != null && actionHandler.getActionDefinitionId() != null) {
IHandlerService service = getHandlerService();
if (service != null) {
IHandlerActivation activation = service.activateHandler(actionHandler.getActionDefinitionId(), new ActionHandler(actionHandler), fExpression);
fPaneActivations.add(activation);
return;
}
}
// Remove the action definition id since we won't get key bindings
if (actionHandler != null)
actionHandler.setActionDefinitionId(null);
}
private void updateActionBars() {
IActionBars bars = getActionBars();
if (bars != null)
bars.updateActionBars();
}
private void clearPaneActionHandlers() {
if (!fPaneActivations.isEmpty()) {
IHandlerService service = getHandlerService();
if (service != null) {
service.deactivateHandlers(fPaneActivations);
fPaneActivations.clear();
}
}
}
private IActionBars getActionBars() {
return fContainer.getActionBars();
}
public void dispose() {
clearPaneActionHandlers();
IHandlerService service = getHandlerService();
if (service == null)
return;
service.deactivateHandlers(fActivations);
fActivations.clear();
fDisposed = true;
}
public void updatePaneActionHandlers(Runnable runnable) {
clearPaneActionHandlers();
runnable.run();
updateActionBars();
}
}
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