import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class SliderDemo extends JFrame implements ActionListener {

    //Set up animation parameters
    static final int FPS_INIT = 5;    //initial frames per second
    int frameNumber = 0;
    int delay;
    Timer timer;
    boolean frozen = false;

    //This label uses ImageIcon to show the burger pictures.
    JLabel picture;

    //The burger filename extensions listed
    //in the order they are shown.
    String[] extensions = { "----", "l---", "lt--", "ltc-",
                            "-tc-", "-t--", "-t-o", "-tco",
                            "ltco", "lt-o", "l--o", "l-co",
                            "l-c-", "--c-", "--co", "---o" };

    SliderDemo(String windowTitle) {
        super(windowTitle);
        delay = 1000 / FPS_INIT;

        //Create the slider and its label
        JLabel sliderLabel = new JLabel("Frames Per Second", JLabel.CENTER);
        sliderLabel.setAlignmentX(Component.CENTER_ALIGNMENT);

        JSlider framesPerSecond = new JSlider(JSlider.HORIZONTAL, 0, 30, FPS_INIT);
        framesPerSecond.addChangeListener(new SliderListener());
        framesPerSecond.setMajorTickSpacing(10);
        framesPerSecond.setMinorTickSpacing(1);
        framesPerSecond.setPaintTicks(true);
        // turns on labels at major tick marks
        // requires spacing for major ticks to be non-zero
        framesPerSecond.setPaintLabels(true);
        framesPerSecond.setBorder(BorderFactory.createEmptyBorder(0,0,10,0));

        //Create the label for the animation
        picture = new JLabel(new ImageIcon("images/burger-" + 
                        extensions[frameNumber] + ".gif"), JLabel.CENTER);
        picture.setAlignmentX(Component.CENTER_ALIGNMENT);
        picture.setBorder(BorderFactory.createCompoundBorder(
                        BorderFactory.createLoweredBevelBorder(),
                        BorderFactory.createEmptyBorder(10,10,10,10)
        ));

        //Put everything in the content pane
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
        contentPane.add(sliderLabel);
        contentPane.add(framesPerSecond);
        contentPane.add(picture);
        contentPane.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
        setContentPane(contentPane);

        //Set up a timer that calls this object's action handler.
        timer = new Timer(delay, this);
        timer.setInitialDelay(3000); //delay for 3 seconds before beginning animation
        timer.setCoalesce(true);

        //Add a listener for window events
        addWindowListener(new WindowAdapter() {
            public void windowIconified(WindowEvent e) {
                stopAnimation();
            }
            public void windowDeiconified(WindowEvent e) {
                startAnimation();
            }
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }  
        });

    }

    /** Listens to the slider. */
    class SliderListener implements ChangeListener {
        public void stateChanged(ChangeEvent e) {
            JSlider source = (JSlider)e.getSource();
            if (!source.getValueIsAdjusting()) {
                int fps = (int)((JSlider)e.getSource()).getValue();
                if (fps == 0) {
                    if (!frozen) stopAnimation();
                } else {
                    delay = 1000 / fps;
                    timer.setDelay(delay);
                    if (frozen) startAnimation();
                }
            }
        }
    }    

    public void startAnimation() {
        //Start (or restart) animating!
        timer.start();
        frozen = false;
    }

    public void stopAnimation() {
        //Stop the animating thread.
        timer.stop();
        frozen = true;
    }

    //Called when the Timer fires
    public void actionPerformed(ActionEvent e) {
        //Advance the animation frame.
        if (frameNumber==(extensions.length-1))
            frameNumber = 0;
        else frameNumber++;
        picture.setIcon(new ImageIcon(
                        "images/burger-" + extensions[frameNumber] + ".gif"));
    }

    public static void main(String args[]) {
        SliderDemo animator = new SliderDemo("Indecision");
        animator.pack();
        animator.setVisible(true);
        animator.startAnimation();
    }
}
