net.sourceforge.squirrel_sql.client.gui.HtmlViewerPanel Maven / Gradle / Ivy
package net.sourceforge.squirrel_sql.client.gui;
/*
* Copyright (C) 2003 Colin Bell
* [email protected]
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.net.URL;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import javax.swing.BorderFactory;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.event.EventListenerList;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLFrameHyperlinkEvent;
import net.sourceforge.squirrel_sql.fw.gui.CursorChanger;
import net.sourceforge.squirrel_sql.fw.gui.TextPopupMenu;
import net.sourceforge.squirrel_sql.fw.util.StringManager;
import net.sourceforge.squirrel_sql.fw.util.StringManagerFactory;
import net.sourceforge.squirrel_sql.fw.util.log.ILogger;
import net.sourceforge.squirrel_sql.fw.util.log.LoggerController;
/**
* This panel shows the contents of a HTML file.
*
* @author Colin Bell
*/
public class HtmlViewerPanel extends JPanel
{
/** Logger for this class. */
private final static ILogger s_log =
LoggerController.createLogger(HtmlViewerPanel.class);
/** Internationalized strings for this class. */
private static final StringManager s_stringMgr =
StringManagerFactory.getStringManager(HtmlViewerPanel.class);
/** Text area containing the HTML. */
private final JEditorPane _contentsTxt = new JEditorPane();
/** JScrollPane for _contentsText. */
private JScrollPane _contentsScrollPane;
/** Original URL (home). */
private URL _homeURL;
/** Current URL. */
private URL _currentURL;
/** History of links. */
private final List _history = new LinkedList();
/** Current index into _history. */
private int _historyIndex = -1;
/**
* Collection of listeners for events in this object.
*/
private EventListenerList _listenerList = new EventListenerList();
/**
* Ctor.
*
* @param url URL to home document.
*/
public HtmlViewerPanel(URL url)
{
super();
createGUI();
setHomeURL(url);
setURL(url);
}
/**
* Retrieve the current URL.
*
* @return The current URL.
*/
public URL getURL()
{
return _currentURL;
}
/**
* Retrieve the home URL.
*
* @return The home URL.
*/
public URL getHomeURL()
{
return _homeURL;
}
/**
* Specify the URL that is to the consider the "Home" URL. THis
* does not change the current URL for this viewer.
*
* @param homeURL The new home URL.
*/
public void setHomeURL(URL homeURL)
{
_homeURL = homeURL;
fireHomeURLChanged();
}
/**
* Adds a listener to this object.
*
* @param lis Listener to be added.
*/
public void addListener(IHtmlViewerPanelListener lis)
{
_listenerList.add(IHtmlViewerPanelListener.class, lis);
}
/**
* Removes a listener from this object.
*
* @param lis Listener to be removed.
*/
void removeListener(IHtmlViewerPanelListener lis)
{
_listenerList.remove(IHtmlViewerPanelListener.class, lis);
}
public synchronized void gotoURL(URL url) throws IOException
{
if (url == null)
{
throw new IllegalArgumentException("URL == null");
}
if (!url.equals(_currentURL))
{
ListIterator it = _history.listIterator(_historyIndex + 1);
while (it.hasNext())
{
it.next();
it.remove();
}
_history.add(url);
_historyIndex = _history.size() - 1;
_contentsTxt.setPage(url);
_currentURL = url;
fireURLChanged();
}
}
public synchronized void goBack()
{
if (_historyIndex > 0 && _historyIndex < _history.size())
{
displayURL(_history.get(--_historyIndex));
}
}
public synchronized void goForward()
{
if (_historyIndex > -1 && _historyIndex < _history.size() - 1)
{
displayURL(_history.get(++_historyIndex));
}
}
public synchronized void goHome()
{
_historyIndex = 0;
displayURL(_homeURL);
}
public void refreshPage()
{
final Point pos = _contentsScrollPane.getViewport().getViewPosition();
displayURL(_currentURL);
_contentsScrollPane.getViewport().setViewPosition(pos);
}
/**
* Displayed the passed URL in this panel.
*
* @param url URL to be displayed.
*/
private synchronized void setURL(URL url)
{
if (url != null)
{
CursorChanger cursorChg = new CursorChanger(this);
cursorChg.show();
try
{
// Causes NPE in JDK 1.3.1
//_contentsTxt.setText("");
displayURL(url);
_history.add(url);
_historyIndex = 0;
}
finally
{
cursorChg.restore();
}
}
}
/**
* Display the passed URL. This method does not affect the URL history, it
* merely displays the URL.
*
* @param url The URL to display.
*/
private void displayURL(URL url)
{
if (url != null)
{
try
{
_contentsTxt.setPage(url);
_currentURL = url;
fireURLChanged();
}
catch (Exception ex)
{
// i18n[HtmlViewerPanel.error.displayurl=Error displaying URL]
s_log.error(s_stringMgr.getString("HtmlViewerPanel.error.displayurl"), ex);
}
}
}
/**
* Fire a "URL changed" event to all listeners.
*/
private void fireURLChanged()
{
// Guaranteed to be non-null.
Object[] listeners = _listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event.
HtmlViewerPanelListenerEvent evt = null;
for (int i = listeners.length - 2; i >= 0; i-=2 )
{
if (listeners[i] == IHtmlViewerPanelListener.class)
{
// Lazily create the event.
if (evt == null)
{
evt = new HtmlViewerPanelListenerEvent(this);
}
((IHtmlViewerPanelListener)listeners[i + 1]).currentURLHasChanged(evt);
}
}
}
/**
* Fire a "Home URL changed" event to all listeners.
*/
private void fireHomeURLChanged()
{
// Guaranteed to be non-null.
Object[] listeners = _listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event.
HtmlViewerPanelListenerEvent evt = null;
for (int i = listeners.length - 2; i >= 0; i-=2 )
{
if (listeners[i] == IHtmlViewerPanelListener.class)
{
// Lazily create the event.
if (evt == null)
{
evt = new HtmlViewerPanelListenerEvent(this);
}
((IHtmlViewerPanelListener)listeners[i + 1]).homeURLHasChanged(evt);
}
}
}
/**
* Create user interface.
*/
private void createGUI()
{
setLayout(new BorderLayout());
add(createMainPanel(), BorderLayout.CENTER);
}
/**
* Create the main panel.
*/
private JPanel createMainPanel()
{
_contentsTxt.setEditable(false);
_contentsTxt.setContentType("text/html");
final TextPopupMenu pop = new TextPopupMenu();
pop.setTextComponent(_contentsTxt);
_contentsTxt.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent evt)
{
if (evt.isPopupTrigger())
{
pop.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
public void mouseReleased(MouseEvent evt)
{
if (evt.isPopupTrigger())
{
pop.show(evt.getComponent(), evt.getX(), evt.getY());
}
}
});
final JPanel pnl = new JPanel(new BorderLayout());
_contentsTxt.setBorder(BorderFactory.createEmptyBorder(0, 1, 0, 0));
_contentsTxt.addHyperlinkListener(createHyperLinkListener());
_contentsScrollPane = new JScrollPane(_contentsTxt,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
pnl.add(_contentsScrollPane, BorderLayout.CENTER);
return pnl;
}
private HyperlinkListener createHyperLinkListener()
{
return new HyperlinkListener()
{
public void hyperlinkUpdate(HyperlinkEvent e)
{
if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
{
if (e instanceof HTMLFrameHyperlinkEvent)
{
((HTMLDocument)_contentsTxt.getDocument()).processHTMLFrameHyperlinkEvent((HTMLFrameHyperlinkEvent)e);
}
else
{
try
{
gotoURL(e.getURL());
}
catch (IOException ex)
{
// i18n[HtmlViewerPanel.error.processhyperlink=Error processing hyperlink]
s_log.error(s_stringMgr.getString("HtmlViewerPanel.error.processhyperlink"), ex);
}
}
}
}
};
}
}
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