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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.

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/*
 *   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 3 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, see .
 */

/*
 * @(#)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.
 * 

* 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. * *

 * class Splasher {
 *   public static void main(String[] args) {
 *     SplashWindow.splash(Startup.class.getResource("splash.gif"));
 *     MyApplication.main(args);
 *     SplashWindow.disposeSplash();
 *   }
 * }
 * 
* * @author Werner Randelshofer * @author Mark Hall * @version $Revision: 10216 $ */ 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 final Image image; /** * This attribute indicates whether the method paint(Graphics) has been called * at least once since the construction of this window.
* This attribute is used to notify method splash(Image) that the window has * been drawn at least once by the AWT event dispatcher thread.
* 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() { @Override 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. */ @Override 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. */ @Override 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. */ @SuppressWarnings("deprecation") 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; } } }




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