splashscreen.java

具有不同语法高亮的编辑器实例

/*
 * 11/14/2003
 *
 * SplashScreen.java - A "splash screen" to display while your Java program
 *                     is loading.
 * Copyright (C) 2003 Robert Futrell
 * [e-mail]
 * www.website.com
 *
 * 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package org.fife.ui;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.net.URL;
import java.net.URLClassLoader;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JWindow;


/**
 * A window to display while your Swing application is loading; it behaves just
 * like a "splash screen."
 *
 * @author Robert Futrell
 * @version 0.6
 */
public class SplashScreen extends JWindow {

	/**
	 * 
	 */
	private static final long serialVersionUID = 4219003390109261647L;

	private ProgressBar progressBar;

	private static final int SMALL_DELAY_MS		= 10;
	private static final int statusBarHeight	= 25;


/*****************************************************************************/


	/**
	 * Creates a new <code>SplashScreen</code> with default color scheme.
	 *
	 * @param splashScreenPath Path to an image file that a
	 *                         <code>URLClassLoader</code> will understand.
	 * @param statusText The status text to initially display.
	 */
	public SplashScreen(String splashScreenPath, String statusText) {
		this(splashScreenPath, statusText, new Color(190,190,190),
			new Color(44,70,154), new Color(75,141,199), Color.WHITE,
			false);
	}


/*****************************************************************************/


	/**
	 * Creates a new <code>SplashScreen</code>.
	 *
	 * @param splashScreenPath Path to an image file that a
	 *                         <code>URLClassLoader</code> will understand.
	 * @param statusText The status text to initially display.
	 * @param statusBackground The color to use as the status bar's background.
	 * @param foreground1 The color to use for the first part of the
	 *                    gradient fill of the status bar.
	 * @param foreground2 The color to use for the second part of the
	 *                    gradient fill of the status bar.
	 * @param textColor The color to use for the status text.
	 * @param smallDelay If <code>true</code>, then the status bar will appear
	 *        to continuously "fill up," even if your <code>updateStatus</code>
	 *        calls are discrete.  For example, if you set the percent complete
	 *        to 40, then to 60, the status bar will appear to continuously
	 *        increment from 40 to 60 instead of making the jump
	 *        instantaneously.  A 10ms delay is placed between each 1%
	 *        increment.
	 */
	public SplashScreen(String splashScreenPath, String statusText,
					Color statusBackground, Color foreground1,
					Color foreground2, Color textColor,
					boolean smallDelay) {

		JPanel contentPane = new JPanel(new BorderLayout());

		// Get the splash screen image.
		URLClassLoader cl = (URLClassLoader)this.getClass().getClassLoader();
		URL imageURL = cl.findResource(splashScreenPath);
		ImageIcon splashScreen = new ImageIcon(imageURL);

		// Create a panel for the splash screen image.
		JLabel imageLabel = new JLabel(splashScreen);
		JPanel splashPanel = new JPanel(new java.awt.GridLayout(1,1));
		splashPanel.add(imageLabel);
		contentPane.add(splashPanel);

		// Create the "progress bar" at the bottom.
		progressBar = new ProgressBar(splashScreen.getIconWidth(),
								statusText, statusBackground,
								foreground1, foreground2, textColor,
								smallDelay);
		contentPane.add(progressBar, BorderLayout.SOUTH);

		// Combine everything and get ready to go.
		setContentPane(contentPane);
		this.pack();
		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
		this.setLocationRelativeTo(null);			// Center on the screen.

	}


/*****************************************************************************/


	/**
	 * Updates the percent complete bar and the associated status text.
	 *
	 * @param statusText The new status text to display.
	 * @param percentComplete The new percentage to have filled in the percent
	 *                        complete bar.
	 */
	public void updateStatus(String statusText, int percentComplete) {
		progressBar.update(statusText, percentComplete);
	}


/*****************************************************************************/


	/**
	 * The "progress bar" part of the splash screen.  This component is
	 * somewhat configurable; you can:
	 * <ul>
	 *   <li>Configure the background color</li>
	 *   <li>Configure the progress "fill in" color, even make it a
	 *       gradient</li>
	 *   <li>Set the status text and its color</li>
	 * </ul>
	 */
	private class ProgressBar extends JPanel {

		/**
		 * 
		 */
		private static final long serialVersionUID = 8877618550785815148L;

		private Dimension preferredSize;
		private Color textColor;
		private GradientPaint paint;
		private int percentComplete;
		private String text;
		private int textX, textY;
		private boolean smallDelay;

		ProgressBar(int width,  String initialText, Color background,
					Color foreground, Color textColor) {
			this(width, initialText, background, foreground, foreground,
				textColor, false);
		}

		ProgressBar(int width, String initialText, Color background,
					Color foreground1, Color foreground2,
					Color textColor, boolean smallDelay) {
			super();
			setBackground(background);
			preferredSize = new Dimension(width, statusBarHeight);
			paint = new GradientPaint(0.0f,0.0f, foreground1,
								0.0f,statusBarHeight, foreground2);
			this.textColor = textColor;
			this.smallDelay = smallDelay;
			update(text, percentComplete);
		}

		public Dimension getPreferredSize() {
			return preferredSize;
		}

		public void paintComponent(Graphics g) {

			// Fill in background.
			super.paintComponent(g);

			// Paint the filled-in portion of the status bar.
			int width = getWidth();
			Graphics2D g2d = (Graphics2D)g;
			Paint oldPaint = g2d.getPaint();
			g2d.setPaint(paint);
			int filledWidth = width*percentComplete/100;
			g2d.fillRect(0,0, filledWidth,getHeight());
			g2d.setPaint(oldPaint);

			// Paint the status text.
			if (text!=null) {
				g2d.setColor(textColor);
				g2d.drawString(text, textX,textY);
			}

		}

		void update(String text, int percentComplete) {
			this.text = text;
			if (text!=null) {
				FontMetrics fm = getFontMetrics(getFont());
				if (fm!=null) {
					int stringLength = fm.charsWidth(
								text.toCharArray(), 0,text.length());
					textX = (getWidth()-stringLength)/2;
					textY = (statusBarHeight + fm.getAscent())/2;
				}
			}
			if (smallDelay) {
				while (this.percentComplete < percentComplete) {
					this.percentComplete++;
					paintImmediately(getBounds());
					try {
						Thread.sleep(SMALL_DELAY_MS);
					} catch (Exception e) {
						e.printStackTrace();
					}
				}
			}
			else {
				this.percentComplete = percentComplete;
				repaint();
			}
		}

	}


/*****************************************************************************/

}