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/*******************************************************************************
* Copyright (c) 2004, 2011 Eugene Kuleshov 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:
* Eugene Kuleshov - initial API and implementation
* Tasktop Technologies - improvements
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui;
import java.util.Map;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.mylyn.internal.tasks.core.AbstractTask;
import org.eclipse.mylyn.internal.tasks.core.TaskActivationHistory;
import org.eclipse.mylyn.internal.tasks.ui.actions.ActivateTaskDialogAction;
import org.eclipse.mylyn.internal.tasks.ui.util.TasksUiInternal;
import org.eclipse.mylyn.tasks.ui.TasksUi;
import org.eclipse.mylyn.tasks.ui.TasksUiImages;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.commands.IElementUpdater;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.menus.UIElement;
/**
* @author Eugene Kuleshov
* @author Steffen Pingel
*/
public class TaskHistoryHandler extends AbstractHandler implements IElementUpdater {
public Object execute(final ExecutionEvent event) throws ExecutionException {
if (TasksUi.getTaskActivityManager().getActiveTask() != null) {
TasksUi.getTaskActivityManager().deactivateActiveTask();
} else {
TaskActivationHistory taskHistory = TasksUiPlugin.getTaskActivityManager().getTaskActivationHistory();
if (taskHistory.hasPrevious()) {
AbstractTask previousTask = taskHistory.getPreviousTask();
if (previousTask != null && !previousTask.isActive()) {
TasksUiInternal.activateTaskThroughCommand(previousTask);
}
} else {
IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindow(event);
if (window != null) {
ActivateTaskDialogAction action = new ActivateTaskDialogAction();
action.init(window);
action.run(null);
}
}
}
return null;
}
@SuppressWarnings("rawtypes")
public void updateElement(UIElement element, Map parameters) {
if (TasksUi.getTaskActivityManager().getActiveTask() == null) {
element.setIcon(TasksUiImages.CONTEXT_HISTORY_PREVIOUS);
} else {
element.setIcon(TasksUiImages.CONTEXT_HISTORY_PREVIOUS_ACTIVE);
}
}
}
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