Bookmark Menu Applet.java
/*
<html>
<head><title>Bookmark Menu Applet Window</title></head>
<body onLoad="document.applets["BookmarkMenuApplet"].setTarget(opener.name);">
<applet code="BookmarkMenuApplet.class" name="BookmarkMenuApplet"
height=20 width=100>
<param name=filename value="bookmark.html">
<param name=target value="j1menutarget">
</applet>
WARNING: Use either parameter 'target' or setTarget() method.
Don't use both!
</body></html>
*/
import java.applet.*;
import java.awt.event.*;
import java.awt.*; // for Menu
import java.net.*; // for URL, MalformedURLException
import java.io.*; // for InputStream, Reader
public class BookmarkMenuApplet extends Applet
{
final PopupMenu m = new PopupMenu();;
final Button b = new Button();
String target = "j1menu"; // target name of browser window
String filename = "bookmark.htm"; // file to read bookmarks from
final Applet a = this; // only final variables can be used in inner anonymous classes
ActionListener jumpToUrl = // When a menu is clicked, jump to corresponding URL
new ActionListener(){
public void actionPerformed(ActionEvent e) {
try{
URL url = new URL(e.getActionCommand()); // the menu's action command stores URL
a.getAppletContext().showDocument(url,target); // load the URL to the target browser window
}catch(MalformedURLException me){
showStatus("Malformed URL: "+e.getActionCommand());
}
}
}
;
public void init()
{
setLayout(new BorderLayout(0,0)); // BorderLayout can display a button ...
// ...with the size of the applet
b.setLabel("Loading...");
b.setSize(this.getSize()); // button should occupy the whole applet
add(b); // Clicking on this button ...
add(m); // ...will activate this popup menu
validate(); // Draw the applet as soon as possible
// ..although it will not be ready for a while
// That will make it look as if it is fast!
// Clicking on the button should open the popup menu
b.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent e){
Rectangle r = b.getBounds();
m.show(a, r.x, r.y+r.height);
}
});
// Load the menu items from the bookmark file
getParameters();
try{ // now load menu description file
MenuLoader loader = new MenuLoader( // create new menu loader...
m // .. to load this menu...
, getBookmarksReader(filename) // .. from this file
, jumpToUrl // .. jump to URL when menu clicked
);
addAboutMenuItem(m, jumpToUrl, // Add "About this applet" menu item
getCodeBase().toString()+"readme.html"); // Description file in the same directory where this applet is
loader.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
if( e.getActionCommand().equals("done") )
b.setLabel("Bookmarks");
else b.setLabel("Error");
}
});
loader.start();
}catch(IOException e){
showStatus("IOException:"+e);
b.setLabel("Loading Error");
b.setEnabled(false);
}
}
/* This method can be called from a JavaScript to
* specify target window for opening bookmarks
*/
public void setTarget(String target){
this.target = target;
}
// ---------------- protected methods ---------------
Reader getBookmarksReader(String filename) throws IOException{
return new InputStreamReader(
new URL(getDocumentBase(), filename)
.openStream()
);
}
void getParameters(){
String t = getParameter("target");
if( t != null ) target = t;
t = getParameter("filename");
if( t!= null ) filename = t;
}
/*
* addAboutMenuItem()
* @purpose Adds "About" menu item as the 1st item in the menu
*/
static void addAboutMenuItem(PopupMenu m, ActionListener action, String url)
{
MenuItem i = new MenuItem("About \"Bookmark Menu Applet\"");
i.setActionCommand(url);
i.addActionListener(action);
m.insertSeparator(0);
m.insert(i,0);
}
// ---------------- methods for testing ----------------
void debug(String msg){ System.out.println(msg); }
/*
public URL getDocumentBase(){
try{
return new URL("file:.");
}catch(MalformedURLException e){
showStatus("MalformedURLException:"+e);
return null;
}
}
public void showStatus(String status){System.out.println(status);}
public static void main(String[] args)
{
Frame f = new Frame("Bookmark Tester");
f.setSize(300,200);
final Applet a = new j1menu();
f.add(a);
f.addWindowListener( new WindowListener(){
public void windowClosed(WindowEvent e) {}
public void windowClosing(WindowEvent e) { System.exit(0); }
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e){}
public void windowIconified(WindowEvent e) { a.stop(); }
public void windowDeiconified(WindowEvent e){ a.start(); }
public void windowOpened(WindowEvent e) { a.init(); a.start();}
});
f.show();
}
*/
}
Return to Bookmark Menu Applet
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
sequences into three useful formats.
Elsewhere on internet.com:
WebDeveloper Java
Lots of Java information on webdeveloper.com
WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.
ScriptSearch Java
Hundreds of free Java code files to download.
jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.
|
