/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.chainsaw;
import org.apache.log4j.chainsaw.icons.ChainsawIcons;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.io.IOException;
import java.net.URL;
import java.util.Stack;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
/**
* An initial Welcome Panel that is used when Chainsaw starts up, can displays
* a HTML pages based on URLs.
*
* @author Paul Smith
* @author Scott Deboy <sdeboy@apache.org>
*/
public class WelcomePanel extends JPanel {
private Stack urlStack = new Stack();
private final JEditorPane textInfo = new JEditorPane();
private final URLToolbar urlToolbar = new URLToolbar();
public WelcomePanel() {
super(new BorderLayout());
setBackground(Color.white);
add(urlToolbar, BorderLayout.NORTH);
URL helpURL = ChainsawConstants.WELCOME_URL;
if (helpURL != null) {
textInfo.setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 5));
textInfo.setEditable(false);
textInfo.setPreferredSize(new Dimension(320, 240));
JScrollPane pane = new JScrollPane(textInfo);
pane.setBorder(null);
add(pane, BorderLayout.CENTER);
try {
textInfo.setPage(helpURL);
textInfo.addHyperlinkListener(
new HyperlinkListener() {
public void hyperlinkUpdate(HyperlinkEvent e) {
if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
urlStack.add(textInfo.getPage());
try {
textInfo.setPage(e.getURL());
urlToolbar.updateToolbar();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}
void setURL(final URL url) {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
try {
urlStack.push(textInfo.getPage());
textInfo.setPage(url);
urlToolbar.updateToolbar();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
private class URLToolbar extends JToolBar {
private final Action previousAction =
new AbstractAction(null, new ImageIcon(ChainsawIcons.ICON_BACK)) {
public void actionPerformed(ActionEvent e) {
if (urlStack.isEmpty()) {
return;
}
setURL((URL) urlStack.pop());
}
};
private final Action homeAction =
new AbstractAction(null, new ImageIcon(ChainsawIcons.ICON_HOME)) {
public void actionPerformed(ActionEvent e) {
setURL(ChainsawConstants.WELCOME_URL);
urlStack.clear();
}
};
private URLToolbar() {
setFloatable(false);
updateToolbar();
previousAction.putValue(Action.SHORT_DESCRIPTION, "Back");
homeAction.putValue(Action.SHORT_DESCRIPTION, "Home");
JButton home = new SmallButton(homeAction);
add(home);
addSeparator();
JButton previous = new SmallButton(previousAction);
previous.setEnabled(false);
add(previous);
addSeparator();
}
void updateToolbar() {
previousAction.setEnabled(!urlStack.isEmpty());
}
}
/**
* @return tooolbar
*/
public JToolBar getToolbar() {
return urlToolbar;
}
}