// MainFrameModified - a modified version of MainFrame, which can run an
// Applet as an application
//
// Modified by Jason Hunter <jhunter@acm.org> to fix bugs and optimize
// for use with servlets (1998).
//
// Copyright (C) 1996 by Jef Poskanzer <jef@acme.com>. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Visit the ACME Labs Java page for up-to-date versions of this and other
// fine Java utilities: http://www.acme.com/java/
package Acme;
import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.net.*;
import java.io.*;
import java.util.*;
/// Run an Applet as an application.
// <P>
// Using this class you can add a trivial main program to any Applet
// and run it directly, as well as from a browser or the appletviewer.
// And unlike some versions of this concept, MainFrame implements both
// images and sound.
// <P>
// Sample main program:
// <BLOCKQUOTE><PRE>
// public static void main( String[] args )
// {
// new Acme.MainFrame( new ThisApplet(), args, 400, 400 );
// }
// </PRE></BLOCKQUOTE>
// The only methods you need to know about are the constructors.
// <P>
// You can specify Applet parameters on the command line, as name=value.
// For instance, the equivalent of:
// <BLOCKQUOTE><PRE>
// <PARAM NAME="pause" VALUE="200">
// </PRE></BLOCKQUOTE>
// would just be:
// <BLOCKQUOTE><PRE>
// pause=200
// </PRE></BLOCKQUOTE>
// You can also specify three special parameters:
// <BLOCKQUOTE><PRE>
// width=N Width of the Applet.
// height=N Height of the Applet.
// barebones=true Leave off the menu bar and status area.
// </PRE></BLOCKQUOTE>
// <P>
// <A HREF="/resources/classes/Acme/MainFrame.java">Fetch the software.</A><BR>
// <A HREF="/resources/classes/Acme.tar.Z">Fetch the entire Acme package.</A>
public class MainFrameModified extends Frame
implements Runnable, AppletStub, AppletContext
{
private String[] args = null;
private static int instances = 0;
private String name;
private boolean barebones = false;
private Applet applet;
private Label label = null;
private Dimension appletSize;
private String PARAM_PROP_PREFIX = null;
/// Constructor with everything specified.
public MainFrameModified(
Applet applet, String[] args, int width, int height )
{
build( applet, args, width, height );
}
/// Constructor with no default width/height.
public MainFrameModified( Applet applet, String[] args )
{
build( applet, args, -1, -1 );
}
/// Constructor with no arg parsing.
public MainFrameModified( Applet applet, int width, int height )
{
build( applet, null, width, height );
}
// Internal constructor routine.
private void build(
Applet applet, String[] args, int width, int height )
{
++instances;
this.applet = applet;
this.args = args;
applet.setStub( this );
name = applet.getClass().getName();
setTitle( name );
// Choose a unique parameter property prefix.
PARAM_PROP_PREFIX = "parameter." + hashCode() + ".";
// Set up properties.
Properties props = System.getProperties();
props.put( "browser", "Acme.MainFrame" );
props.put( "browser.version", "11jul96" );
props.put( "browser.vendor", "Acme Laboratories" );
props.put( "browser.vendor.url", "http://www.acme.com/" );
// Turn args into parameters by way of the properties list.
if ( args != null )
parseArgs( args, props );
// If width and height are specified in the parameters, override
// the compiled-in values.
String widthStr = getParameter( "width" );
if ( widthStr != null )
width = Integer.parseInt( widthStr );
String heightStr = getParameter( "height" );
if ( heightStr != null )
height = Integer.parseInt( heightStr );
// Were width and height specified somewhere?
if ( width == -1 || height == -1 )
{
System.err.println( "Width and height must be specified." );
return;
}
// Do we want to run bare-bones?
String bonesStr = getParameter( "barebones" );
if ( bonesStr != null && bonesStr.equals( "true" ) )
barebones = true;
if ( ! barebones )
{
// Make menu bar.
MenuBar mb = new MenuBar();
Menu m = new Menu( "Applet" );
m.add( new MenuItem( "Restart" ) );
m.add( new MenuItem( "Clone" ) );
m.add( new MenuItem( "Close" ) );
m.add( new MenuItem( "Quit" ) );
mb.add( m );
setMenuBar( mb );
}
// Lay out components.
setLayout( new BorderLayout() );
add( "Center", applet );
if ( ! barebones )
{
Panel borderPanel =
new Acme.Widgets.BorderPanel( Acme.Widgets.BorderPanel.RAISED );
borderPanel.setLayout( new BorderLayout() );
label = new Label( "" );
borderPanel.add( "Center", label );
add( "South", borderPanel );
}
// Set up size.
pack();
validate();
appletSize = applet.size();
applet.resize( width, height );
//show();
// Start a separate thread to call the applet's init() and start()
// methods, in case they take a long time.
//(new Thread( this )).start();
run();
}
// Turn command-line arguments into Applet parameters, by way of the
// properties list.
private void parseArgs( String[] args, Properties props )
{
for ( int i = 0; i < args.length; ++i )
{
String arg = args[i];
int ind = arg.indexOf( '=' );
if ( ind == -1 )
props.put( PARAM_PROP_PREFIX + arg.toLowerCase(), "" );
else
props.put(
PARAM_PROP_PREFIX + arg.substring( 0, ind ).toLowerCase(),
arg.substring( ind + 1 ) );
}
}
/// Event handler for the menu bar.
public boolean handleEvent( Event evt )
{
switch ( evt.id )
{
case Event.ACTION_EVENT:
if ( evt.arg.equals( "Restart" ) )
{
applet.stop();
applet.destroy();
Thread thread = new Thread( this );
thread.start();
}
else if ( evt.arg.equals( "Clone" ) )
{
try
{
new MainFrameModified(
(Applet) applet.getClass().newInstance(), args,
appletSize.width, appletSize.height );
}
catch ( IllegalAccessException e )
{
showStatus( e.getMessage() );
}
catch ( InstantiationException e )
{
showStatus( e.getMessage() );
}
}
else if ( evt.arg.equals( "Close" ) )
{
hide();
remove( applet );
applet.stop();
applet.destroy();
if ( label != null )
remove( label );
dispose();
--instances;
if ( instances == 0 )
System.exit( 0 );
}
else if ( evt.arg.equals( "Quit" ) )
System.exit( 0 );
break;
case Event.WINDOW_DESTROY:
System.exit( 0 );
break;
}
return super.handleEvent( evt );
}
// Methods from Runnable.
/// Separate thread to call the applet's init() and start() methods.
public void run()
{
showStatus( name + " initializing..." );
applet.init();
validate();
showStatus( name + " starting..." );
applet.start();
validate();
showStatus( name + " running..." );
}
// Methods from AppletStub.
public boolean isActive()
{
return true;
}
public URL getDocumentBase()
{
// Returns the current directory.
String dir = System.getProperty( "user.dir" );
String urlDir = dir.replace( File.separatorChar, '/' );
try
{
return new URL( "file:" + urlDir + "/");
}
catch ( MalformedURLException e )
{
return null;
}
}
public URL getCodeBase()
{
// Hack: loop through each item in CLASSPATH, checking if
// the appropriately named .class file exists there. But
// this doesn't account for .zip files.
String path = System.getProperty( "java.class.path" );
Enumeration st = new StringTokenizer( path, File.pathSeparator );
while ( st.hasMoreElements() )
{
String dir = (String) st.nextElement();
String transname = name.replace( '.', File.separatorChar );
String filename = dir + File.separatorChar + transname + ".class";
File file = new File( filename );
if ( file.exists() )
{
String urlDir = dir.replace( File.separatorChar, '/' );
try
{
return new URL( "file:" + urlDir + "/" );
}
catch ( MalformedURLException e )
{
return null;
}
}
}
try
{
return new URL("http://localhost/");
}
catch (MalformedURLException e)
{
return null;
}
}
public String getParameter( String name )
{
// Return a parameter via the munged names in the properties list.
return System.getProperty( PARAM_PROP_PREFIX + name.toLowerCase() );
}
public void appletResize( int width, int height )
{
// Change the frame's size by the same amount that the applet's
// size is changing.
Dimension frameSize = size();
frameSize.width += width - appletSize.width;
frameSize.height += height - appletSize.height;
resize( frameSize );
appletSize = applet.size();
}
public AppletContext getAppletContext()
{
return this;
}
// Methods from AppletContext.
public AudioClip getAudioClip( URL url )
{
// This is an internal undocumented routine. However, it
// also provides needed functionality not otherwise available.
// I suspect that in a future release, JavaSoft will add an
// audio content handler which encapsulates this, and then
// we can just do a getContent just like for images.
return new sun.applet.AppletAudioClip( url );
}
public Image getImage( URL url )
{
Toolkit tk = Toolkit.getDefaultToolkit();
try
{
ImageProducer prod = (ImageProducer) url.getContent();
return tk.createImage( prod );
}
catch ( IOException e )
{
return null;
}
}
public Applet getApplet( String name )
{
// Returns this Applet or nothing.
if ( name.equals( this.name ) )
return applet;
return null;
}
public Enumeration getApplets()
{
// Just yields this applet.
Vector v = new Vector();
v.addElement( applet );
return v.elements();
}
public void showDocument( URL url )
{
// Ignore.
}
public void showDocument( URL url, String target )
{
// Ignore.
}
public void showStatus( String status )
{
if ( label != null )
label.setText( status );
}
}
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