/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* @(#)SplashWindow.java 2.2 2005-04-03
*
* Copyright (c) 2003-2005 Werner Randelshofer
* Staldenmattweg 2, Immensee, CH-6405, Switzerland.
* All rights reserved.
*
* This software is in the public domain.
*
*/
package weka.gui;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;
/**
* A Splash window.
* <p>
* Usage: MyApplication is your application class. Create a Splasher class which
* opens the splash window, invokes the main method of your Application class,
* and disposes the splash window afterwards.
* Please note that we want to keep the Splasher class and the SplashWindow class
* as small as possible. The less code and the less classes must be loaded into
* the JVM to open the splash screen, the faster it will appear.
* <pre>
* class Splasher {
* public static void main(String[] args) {
* SplashWindow.splash(Startup.class.getResource("splash.gif"));
* MyApplication.main(args);
* SplashWindow.disposeSplash();
* }
* }
* </pre>
*
* @author Werner Randelshofer
* @author Mark Hall
* @version $Revision: 1.3 $
*/
public class SplashWindow
extends Window {
/** for serialization */
private static final long serialVersionUID = -2685134277041307795L;
/**
* The current instance of the splash window.
* (Singleton design pattern).
*/
private static SplashWindow m_instance;
/**
* The splash image which is displayed on the splash window.
*/
private Image image;
/**
* This attribute indicates whether the method
* paint(Graphics) has been called at least once since the
* construction of this window.<br>
* This attribute is used to notify method splash(Image)
* that the window has been drawn at least once
* by the AWT event dispatcher thread.<br>
* This attribute acts like a latch. Once set to true,
* it will never be changed back to false again.
*
* @see #paint
* @see #splash
*/
private boolean paintCalled = false;
/**
* Creates a new instance.
* @param parent the parent of the window.
* @param image the splash image.
*/
private SplashWindow(Frame parent, Image image) {
super(parent);
this.image = image;
// Load the image
MediaTracker mt = new MediaTracker(this);
mt.addImage(image,0);
try {
mt.waitForID(0);
} catch(InterruptedException ie){
}
// Center the window on the screen
int imgWidth = image.getWidth(this);
int imgHeight = image.getHeight(this);
setSize(imgWidth, imgHeight);
Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize();
setLocation(
(screenDim.width - imgWidth) / 2,
(screenDim.height - imgHeight) / 2
);
// Users shall be able to close the splash window by
// clicking on its display area. This mouse listener
// listens for mouse clicks and disposes the splash window.
MouseAdapter disposeOnClick = new MouseAdapter() {
public void mouseClicked(MouseEvent evt) {
// Note: To avoid that method splash hangs, we
// must set paintCalled to true and call notifyAll.
// This is necessary because the mouse click may
// occur before the contents of the window
// has been painted.
synchronized(SplashWindow.this) {
SplashWindow.this.paintCalled = true;
SplashWindow.this.notifyAll();
}
dispose();
}
};
addMouseListener(disposeOnClick);
}
/**
* Updates the display area of the window.
*/
public void update(Graphics g) {
// Note: Since the paint method is going to draw an
// image that covers the complete area of the component we
// do not fill the component with its background color
// here. This avoids flickering.
paint(g);
}
/**
* Paints the image on the window.
*/
public void paint(Graphics g) {
g.drawImage(image, 0, 0, this);
// Notify method splash that the window
// has been painted.
// Note: To improve performance we do not enter
// the synchronized block unless we have to.
if (! paintCalled) {
paintCalled = true;
synchronized (this) { notifyAll(); }
}
}
/**
* Open's a splash window using the specified image.
* @param image The splash image.
*/
public static void splash(Image image) {
if (m_instance == null && image != null) {
Frame f = new Frame();
// Create the splash image
m_instance = new SplashWindow(f, image);
// Show the window.
m_instance.show();
// Note: To make sure the user gets a chance to see the
// splash window we wait until its paint method has been
// called at least once by the AWT event dispatcher thread.
// If more than one processor is available, we don't wait,
// and maximize CPU throughput instead.
if (!EventQueue.isDispatchThread()
&& Runtime.getRuntime().availableProcessors() == 1) {
synchronized (m_instance) {
while (! m_instance.paintCalled) {
try { m_instance.wait(); } catch (InterruptedException e) {}
}
}
}
}
}
/**
* Open's a splash window using the specified image.
* @param imageURL The url of the splash image.
*/
public static void splash(URL imageURL) {
if (imageURL != null) {
splash(Toolkit.getDefaultToolkit().createImage(imageURL));
}
}
/**
* Closes the splash window.
*/
public static void disposeSplash() {
if (m_instance != null) {
m_instance.getOwner().dispose();
m_instance = null;
}
}
/**
* Invokes the named method of the provided class name.
* @param className the name of the class
* @param methodName the name of the method to invoke
* @param args the command line arguments
*/
public static void invokeMethod(String className, String methodName,
String [] args) {
try {
Class.forName(className)
.getMethod(methodName, new Class[] {String[].class})
.invoke(null, new Object[] {args});
} catch (Exception e) {
InternalError error = new InternalError("Failed to invoke method: "
+methodName);
error.initCause(e);
throw error;
}
}
/**
* Invokes the main method of the provided class name.
* @param className the name of the class
* @param args the command line arguments
*/
public static void invokeMain(String className, String[] args) {
try {
Class.forName(className)
.getMethod("main", new Class[] {String[].class})
.invoke(null, new Object[] {args});
} catch (Exception e) {
InternalError error = new InternalError("Failed to invoke main method");
error.initCause(e);
throw error;
}
}
}