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/******************************************************************************
* Copyright (c) 2011 GitHub Inc.
* 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:
* Kevin Sawicki (GitHub Inc.) - initial API and implementation
*****************************************************************************/
package org.eclipse.mylyn.internal.github.ui;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.mylyn.tasks.core.ITask;
import org.eclipse.mylyn.tasks.core.data.TaskData;
import org.eclipse.mylyn.tasks.ui.TasksUi;
import org.eclipse.ui.ISources;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.handlers.IHandlerService;
import org.eclipse.ui.progress.IWorkbenchSiteProgressService;
/**
* Base handler for working with a {@link TaskData} selection
*/
public abstract class TaskDataHandler extends AbstractHandler {
/**
* POST_HANDLER_CALLBACK - variable for post handler callback that is a
* {@link Runnable}
*/
public static final String POST_HANDLER_CALLBACK = "postHandlerCallback";
/**
* Create context with given selection
*
* @param selection
* @param handlerService
* @return context
*/
public static IEvaluationContext createContext(
IStructuredSelection selection, IHandlerService handlerService) {
IEvaluationContext context = new EvaluationContext(
handlerService.createContextSnapshot(false), selection.toList());
context.addVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME, selection);
context.removeVariable(ISources.ACTIVE_MENU_SELECTION_NAME);
return context;
}
/**
* Get task data from event
*
* @param event
* @return task data
*/
protected TaskData getTaskData(ExecutionEvent event) {
ISelection selection = HandlerUtil.getCurrentSelection(event);
if (selection == null || selection.isEmpty())
selection = HandlerUtil.getActiveMenuSelection(event);
if (selection instanceof IStructuredSelection && !selection.isEmpty()) {
Object first = ((IStructuredSelection) selection).getFirstElement();
if (first instanceof TaskData)
return (TaskData) first;
else if (first instanceof ITask)
try {
return TasksUi.getTaskDataManager().getTaskData(
(ITask) first);
} catch (CoreException e) {
return null;
}
}
return null;
}
/**
* Should this handler be enabled for the given task data?
*
* Always returns true by default, sub-classes should override
*
* @param data
* @return true is enabled, false otherwise
*/
protected boolean isEnabled(TaskData data) {
return true;
}
/**
* Schedule job
*
* @param job
* @param event
*/
protected void schedule(Job job, ExecutionEvent event) {
IWorkbenchSite site = HandlerUtil.getActiveSite(event);
if (site == null) {
IWorkbenchPart part = PlatformUI.getWorkbench()
.getActiveWorkbenchWindow().getActivePage().getActivePart();
if (part != null)
site = part.getSite();
}
IWorkbenchSiteProgressService progress = site != null ? (IWorkbenchSiteProgressService) site
.getService(IWorkbenchSiteProgressService.class) : null;
if (progress != null)
progress.schedule(job);
else
job.schedule();
}
/**
* Execute callback on trigger if configured
*
* @param event
*/
protected void executeCallback(ExecutionEvent event) {
Object callback = HandlerUtil.getVariable(event, POST_HANDLER_CALLBACK);
if (callback instanceof Runnable)
((Runnable) callback).run();
}
}
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