// BlogBridge -- RSS feed reader, manager, and web based service
// Copyright (C) 2002-2006 by R. Pito Salas
//
// This program is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software Foundation;
// either version 2 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with this program;
// if not, write to the Free Software Foundation, Inc., 59 Temple Place,
// Suite 330, Boston, MA 02111-1307 USA
//
// Contact: R. Pito Salas
// mailto:pitosalas@users.sourceforge.net
// More information: about BlogBridge
// http://www.blogbridge.com
// http://sourceforge.net/projects/blogbridge
//
// $Id: GotoPreviousUnreadAction.java,v 1.22 2007/09/19 15:55:01 spyromus Exp $
//
package com.salas.bb.core.actions.article;
import com.salas.bb.core.GlobalController;
import com.salas.bb.core.GlobalModel;
import com.salas.bb.core.IArticleListNavigationListener;
import com.salas.bb.domain.IArticle;
import com.salas.bb.views.INavigationModes;
import com.salas.bb.views.feeds.IFeedDisplay;
import javax.swing.*;
import java.awt.event.ActionEvent;
/**
* Moves selection to the previous unread article.
*
* Action is enabled/disabled by <code>ActionsManager</code>.
*/
public final class GotoPreviousUnreadAction extends AbstractAction
{
private static GotoPreviousUnreadAction instance;
/**
* Hidden constructor of singleton class.
*/
private GotoPreviousUnreadAction()
{
setEnabled(false);
}
/**
* Returns initialized instance.
*
* @return instance of action.
*/
public static synchronized GotoPreviousUnreadAction getInstance()
{
if (instance == null) instance = new GotoPreviousUnreadAction();
return instance;
}
/**
* Invoked when action occurs.
*
* @param e action event details object.
*/
public void actionPerformed(ActionEvent e)
{
GlobalController controller = GlobalController.SINGLETON;
IFeedDisplay feedDisplay = controller.getMainFrame().getArticlesListPanel().getFeedView();
GlobalModel model = GlobalModel.SINGLETON;
final IArticle selectedArticle = model.getSelectedArticle();
boolean articleWasSelected = feedDisplay.selectPreviousArticle(INavigationModes.MODE_UNREAD);
if (selectedArticle != null)
{
// Mark an article as read and update stats
GlobalController.readArticles(true,
model.getSelectedGuide(),
model.getSelectedFeed(),
selectedArticle);
// Focus traversal is asynchronous. During the next article selection
// it was moved to the next article, but when current article will be
// removed the focus will be forwarded away from the display. We need
// to get it back.
feedDisplay.focus();
}
if (!articleWasSelected)
{
IArticleListNavigationListener nav = GlobalController.SINGLETON.getNavigationListener();
nav.prevFeed(INavigationModes.MODE_UNREAD);
}
}
}