Moving Button
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/*
* MovingButton.java
*
* Created on May 2, 2007, 4:17 PM
*
* Copyright (c) 2007, Sun Microsystems, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of the TimingFramework project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*/
/**
*
* @author Chet
*/
public class MovingButton extends JButton implements ActionListener {
Timer timer; // for later start/stop actions
int animationDuration = 2000; // each animation will take 2 seconds
long animStartTime; // start time for each animation
int translateY = 0; // y location of the button
static final int MAX_Y = 100;
/** Creates a new instance of TranslucentButton */
public MovingButton(String label) {
super(label);
setOpaque(false);
timer = new Timer(30, this);
addActionListener(this);
}
/**
* Displays our component in the location (0, translateY). Note that
* this changes only the rendering location of the button, not the
* physical location of it. Note, also, that rendering into g will
* be clipped to the physical location of the button, so the button will
* disappear as it moves away from that location.
*/
public void paint(Graphics g) {
g.translate(0, translateY);
super.paint(g);
}
/**
* This method handles both button clicks, which start/stop the animation,
* and Swing Timer events.
*/
public void actionPerformed(ActionEvent ae) {
if (ae.getSource().equals(this)) {
// button click
if (!timer.isRunning()) {
animStartTime = System.nanoTime() / 1000000;
this.setText("Stop Animation");
timer.start();
} else {
timer.stop();
this.setText("Start Animation");
// reset translation to 0
translateY = 0;
}
} else {
// Timer event
// calculate the elapsed fraction
long currentTime = System.nanoTime() / 1000000;
long totalTime = currentTime - animStartTime;
if (totalTime > animationDuration) {
animStartTime = currentTime;
}
float fraction = (float)totalTime / animationDuration;
fraction = Math.min(1.0f, fraction);
// This calculation will cause translateY to go from 0 to MAX_Y
// as the fraction goes from 0 to 1
if (fraction < .5f) {
translateY = (int)(MAX_Y * (2 * fraction));
} else {
translateY = (int)(MAX_Y * (2 * (1 - fraction)));
}
// redisplay our component with the new location
repaint();
}
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Moving Button");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
JPanel checkerboard = new Checkerboard();
checkerboard.add(new MovingButton("Start Animation"));
f.add(checkerboard);
f.setVisible(true);
}
public static void main(String args[]) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
/**
* Paints a checkerboard background
*/
private static class Checkerboard extends JPanel {
private static final int DIVISIONS = 10;
static final int CHECKER_SIZE = 60;
public void paintComponent(Graphics g) {
g.setColor(Color.white);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLACK);
for (int stripeX = 0; stripeX < getWidth(); stripeX += CHECKER_SIZE) {
for (int y = 0, row = 0; y < getHeight(); y += CHECKER_SIZE/2, ++row) {
int x = (row % 2 == 0) ? stripeX : (stripeX + CHECKER_SIZE/2);
g.fillRect(x, y, CHECKER_SIZE/2, CHECKER_SIZE/2);
}
}
}
}
}
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