import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
public class AnimationConatainer extends JFrame
{ 
    public AnimationConatainer()
    {
    	JFrame f = new JFrame("Animation des composant en Java");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(250, 200);
        f.add(new CustomContainer());
        f.setVisible(true);
    }
	public static void main(String argv[]) 
    {
        Runnable showMyGUI = new Runnable() {
            public void run() {
                new AnimationConatainer();
            }
        };
        SwingUtilities.invokeLater(showMyGUI);
    }
}
class CustomContainer extends JComponent  implements ActionListener {
 
    Timer timer;                        
    int dureeAnimation = 5000;   // Le bouton reste 5 secondes dans l'ombre   
    long animStartTime;               
    int translateY = 0;               
    static final int MAX_Y = 100;
    JButton btn;
 
    /** 
     * Ajouter un composant dans le container.
     * Exemple avec JButton  
     *
     **/
    public CustomContainer() 
    {
        setLayout(new java.awt.FlowLayout());
        timer = new Timer(30, this);
        btn = new JButton("Démarrer l'animation");
        btn.setOpaque(false);
        btn.addActionListener(this);
        add(btn);
    }
 
 
    public void paint(Graphics g) {
        g.translate(0, translateY);
        super.paint(g);
    }
 
     /*
      * Cette méthode gère les cliques
      * de lancement et d'arrêt de l'animation
      */
    public void actionPerformed(ActionEvent evt) {
        if (evt.getSource().equals(btn)) {
            // Démarrer l'animation
            if (!timer.isRunning()) {
                animStartTime = System.nanoTime() / 1000000;
                btn.setText("Stopper l'animation");
                timer.start();
            } else {
            	// Arrêter l'animation
                timer.stop();
                btn.setText("Démarrer l'animation");
                translateY = 0;
                repaint();
            }
        } else {
            long currentTime = System.nanoTime() / 1000000;
            long totalTime = currentTime - animStartTime;
            if (totalTime > dureeAnimation) {
                animStartTime = currentTime;
            }
            float fraction = (float)totalTime / dureeAnimation;
            fraction = Math.min(1.0f, fraction);
             if (fraction < .5f) {
                translateY = (int)(MAX_Y * (2 * fraction));
            } else {
                translateY = (int)(MAX_Y * (2 * (1 - fraction)));
            }
            repaint();
        }
    }
 
 
 
}