newsview.java

EclipseTrader is a stock exchange analysis system, featuring shares pricing watch, intraday and hi

/*
 * Copyright (c) 2004-2006 Marco Maccaferri 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:
 *     Marco Maccaferri - initial API and implementation
 */

package net.sourceforge.eclipsetrader.news.views;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Observable;
import java.util.Observer;

import net.sourceforge.eclipsetrader.core.CorePlugin;
import net.sourceforge.eclipsetrader.core.ICollectionObserver;
import net.sourceforge.eclipsetrader.core.db.NewsItem;
import net.sourceforge.eclipsetrader.core.db.Security;
import net.sourceforge.eclipsetrader.core.ui.views.WebBrowser;
import net.sourceforge.eclipsetrader.news.NewsPlugin;

import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.IOpenListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.OpenEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.ViewPart;
import org.eclipse.ui.themes.ITheme;
import org.eclipse.ui.themes.IThemeManager;

public class NewsView extends ViewPart {
	public static final String VIEW_ID = "net.sourceforge.eclipsetrader.newslist"; //$NON-NLS-1$

	static final String TABLE_BACKGROUND = "NEWS_TABLE_BACKGROUND"; //$NON-NLS-1$

	static final String TABLE_FOREGROUND = "NEWS_TABLE_FOREGROUND"; //$NON-NLS-1$

	static final String TABLE_FONT = "NEWS_TABLE_FONT"; //$NON-NLS-1$

	static final String READED_ITEM_BACKGROUND = "NEWS_READED_ITEM_BACKGROUND"; //$NON-NLS-1$

	static final String READED_ITEM_FOREGROUND = "NEWS_READED_ITEM_FOREGROUND"; //$NON-NLS-1$

	static final String READED_ITEM_FONT = "NEWS_READED_ITEM_FONT"; //$NON-NLS-1$

	static final String NEW_ITEM_BACKGROUND = "NEWS_NEW_ITEM_BACKGROUND"; //$NON-NLS-1$

	static final String NEW_ITEM_FOREGROUND = "NEWS_NEW_ITEM_FOREGROUND"; //$NON-NLS-1$

	static final String NEW_ITEM_FONT = "NEWS_NEW_ITEM_FONT"; //$NON-NLS-1$
	
	IDialogSettings settings;
	
	Security security;

	TableViewer viewer;
	
	NewsLabelProvider labelProvider = new NewsLabelProvider();

	List newsList = new ArrayList();

	IPropertyChangeListener themeChangeListener = new IPropertyChangeListener() {
		public void propertyChange(PropertyChangeEvent event) {
			ITheme theme = (ITheme)event.getSource();
            if (event.getProperty().equals(TABLE_BACKGROUND))
                viewer.getControl().setBackground(theme.getColorRegistry().get(TABLE_BACKGROUND));
            else if (event.getProperty().equals(TABLE_FOREGROUND))
            	viewer.getControl().setForeground(theme.getColorRegistry().get(TABLE_FOREGROUND));
            else if (event.getProperty().equals(TABLE_FONT))
            	viewer.getControl().setFont(theme.getFontRegistry().get(TABLE_FONT));
            else if (event.getProperty().equals(NEW_ITEM_BACKGROUND)) {
            	labelProvider.setAddedBackground(theme.getColorRegistry().get(NEW_ITEM_BACKGROUND));
            	viewer.refresh();
            }
            else if (event.getProperty().equals(NEW_ITEM_FOREGROUND)) {
            	labelProvider.setAddedForeground(theme.getColorRegistry().get(NEW_ITEM_FOREGROUND));
            	viewer.refresh();
            }
            else if (event.getProperty().equals(NEW_ITEM_FONT)) {
            	labelProvider.setAddedFont(theme.getFontRegistry().get(NEW_ITEM_FONT));
            	viewer.refresh();
            }
            else if (event.getProperty().equals(READED_ITEM_BACKGROUND)) {
            	labelProvider.setReadedBackground(theme.getColorRegistry().get(READED_ITEM_BACKGROUND));
            	viewer.refresh();
            }
            else if (event.getProperty().equals(READED_ITEM_FOREGROUND)) {
            	labelProvider.setReadedForeground(theme.getColorRegistry().get(READED_ITEM_FOREGROUND));
            	viewer.refresh();
            }
            else if (event.getProperty().equals(READED_ITEM_FONT)) {
            	labelProvider.setReadedFont(theme.getFontRegistry().get(READED_ITEM_FONT));
            	viewer.refresh();
            }
		}
	};
	
	ICollectionObserver collectionObserver = new ICollectionObserver() {
        public void itemAdded(Object o) {
    		final NewsItem newsItem = (NewsItem)o;
        	if (security == null || newsItem.isSecurity(security)) {
        		newsList.add(newsItem);
            	try {
            		viewer.getControl().getDisplay().asyncExec(new Runnable() {
                        public void run() {
            	            if (!viewer.getControl().isDisposed()) {
            	        		viewer.add(newsItem);
            	        		newsItem.addObserver(newsItemObserver);
            	            }
                        }
            		});
            	} catch(SWTException e) {
            		if (e.code != SWT.ERROR_WIDGET_DISPOSED)
            			throw(e);
            	}
        	}
        }

        public void itemRemoved(Object o) {
    		final NewsItem newsItem = (NewsItem)o;
        	if (security == null || newsItem.isSecurity(security)) {
        		newsList.remove(newsItem);
            	try {
            		viewer.getControl().getDisplay().asyncExec(new Runnable() {
                        public void run() {
            	            if (!viewer.getControl().isDisposed()) {
            	        		viewer.remove(newsItem);
            	        		newsItem.deleteObserver(newsItemObserver);
            	            }
                        }
            		});
            	} catch(SWTException e) {
            		if (e.code != SWT.ERROR_WIDGET_DISPOSED)
            			throw(e);
            	}
        	}
        }
	};
	
	Observer newsItemObserver = new Observer() {
        public void update(final Observable o, Object arg) {
        	try {
        		viewer.getControl().getDisplay().asyncExec(new Runnable() {
                    public void run() {
        	            if (!viewer.getControl().isDisposed())
        	            	viewer.update(o, null);
                    }
        		});
        	} catch(SWTException e) {
        		if (e.code != SWT.ERROR_WIDGET_DISPOSED)
        			throw(e);
        	}
        }
	};

	ControlAdapter controlListener = new ControlAdapter() {
        public void controlResized(ControlEvent e) {
	        TableColumn column = (TableColumn)e.widget;
	        int index = viewer.getTable().indexOf(column);
	        settings.put("column" + String.valueOf(index) + ".width", column.getWidth()); //$NON-NLS-1$ //$NON-NLS-2$
	    }
	};
	
	Action refreshAction = new Action(Messages.NewsView_UpdateAction) {
        public void run() {
            if (security != null)
                NewsPlugin.getDefault().startFeedSnapshot(security);
            else
                NewsPlugin.getDefault().startFeedSnapshot();
        }
	};
	
	Action showNextAction = new Action(Messages.NewsView_NextAction) {
        public void run() {
        	showNext();
        }
	};
	
	Action showPreviousAction = new Action(Messages.NewsView_PreviousAction) {
        public void run() {
        	showPrevious();
        }
	};
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.ViewPart#init(org.eclipse.ui.IViewSite)
	 */
	public void init(IViewSite site) throws PartInitException {
		refreshAction.setImageDescriptor(NewsPlugin.getImageDescriptor("icons/elcl16/refresh.gif")); //$NON-NLS-1$
		refreshAction.setDisabledImageDescriptor(NewsPlugin.getImageDescriptor("icons/dlcl16/refresh.gif")); //$NON-NLS-1$

		showNextAction.setImageDescriptor(NewsPlugin.getImageDescriptor("icons/elcl16/next_nav.gif")); //$NON-NLS-1$
		showNextAction.setDisabledImageDescriptor(NewsPlugin.getImageDescriptor("icons/dlcl16/next_nav.gif")); //$NON-NLS-1$

		showPreviousAction.setImageDescriptor(NewsPlugin.getImageDescriptor("icons/elcl16/prev_nav.gif")); //$NON-NLS-1$
		showPreviousAction.setDisabledImageDescriptor(NewsPlugin.getImageDescriptor("icons/dlcl16/prev_nav.gif")); //$NON-NLS-1$

		IMenuManager menuManager = site.getActionBars().getMenuManager();
		menuManager.add(new Separator("top")); //$NON-NLS-1$
		menuManager.add(new Separator("group1")); //$NON-NLS-1$
		menuManager.add(new Separator("group2")); //$NON-NLS-1$
		menuManager.add(new Separator("group3")); //$NON-NLS-1$