SplashWindow.java

package org.skylion.mangareader.util;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.net.URL;

import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * A simple SplashScreen that extends JFrame without the need for an image
 * or messing with the manifest.
 * @author Skylion
 */
public class SplashWindow extends JFrame {

	private static final long serialVersionUID = 9090438525613758648L;

	private static SplashWindow instance;

	private boolean paintCalled = false;

	private Image image;
	
	private SplashWindow(Image image) {
		super();
		this.image = image;
		JLabel label = new JLabel();
		label.setIcon(new ImageIcon(image));
		label.setBackground(Color.WHITE);
		this.add(label);    
		this.setUndecorated(true);
		this.setAlwaysOnTop(true);
		this.pack();
		this.setLocationRelativeTo(null);
	}
	
	private SplashWindow(JLabel label) {
		super();
		this.getContentPane().add(label);
		this.setUndecorated(true);
		this.setAlwaysOnTop(true);
		Dimension lSize = label.getPreferredSize();
		if(lSize.width < 500 || lSize.height < 250){
			this.setSize(500, 250);
		}
		else{
			this.pack();
		}
        this.setLocationRelativeTo(null);
	}
		
	/**
	 * Displays a splash screen with the specified font, 
	 * using the specified foreground and background.
	 * @param splashText The text
	 * @param font The font
	 * @param foreground The color of the text
	 * @param background The color of the background
	 */
	public static void splash(String splashText, Font font, Color foreground, Color background){
		JLabel label = new JLabel(splashText);
		label.setFont(font);
		label.setForeground(foreground);
		label.setBackground(background);
		label.setOpaque(true);
		label.setHorizontalAlignment(JLabel.HORIZONTAL);
		label.setBorder(BorderFactory.createLineBorder(foreground));
		splash(label);
	}
	
	/**
	 * A URL pointing to an image you would like to display from a URL.
	 * @param imageURL
	 */
	public static void splash(URL imageURL) {
		if (imageURL != null) {
			splash(Toolkit.getDefaultToolkit().createImage(imageURL));
		}
	}

	/**
	 * Displays the specified image as the SplashScreen
	 * @param image The image you want to display.
	 */
	public static void splash(Image image) {
		if (instance == null && image != null) {
			instance = new SplashWindow(image);
			instance.setVisible(true);
			
			paint();
		}
	}	

	/**
	 * Displays an image using the specified JLabel. Allows custom formating of screen.
	 * @param label The JLabel you want to display.
	 */
	public static void splash(JLabel label){
		if (instance == null && label != null) {
			instance = new SplashWindow(label);
			instance.setVisible(true);
			
			paint();
		}
	}

	private static void paint(){
		if (!EventQueue.isDispatchThread() && Runtime.getRuntime().availableProcessors() == 1) {
			synchronized (instance) {
				while (!instance.paintCalled) {
					try {
						instance.wait();
					} catch (InterruptedException e) {
					}
				}
			}
		}
	}

	@Override
	public void update(Graphics g) {
		paint(g);
	}

	@Override
	public void paint(Graphics g) {
		if(image == null){
			super.paint(g);
		}
		g.drawImage(image, 0, 0, this);
		
		if (!paintCalled) {
			paintCalled = true;
			synchronized (this) {
				notifyAll();
			}
		}
	}
	
	/**
	 * Closes the splash screen.
	 */
	public static void disposeSplash() {
		if(instance == null){
			return;
		}
		instance.setVisible(false);
		instance.dispose();
	}
}