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How to create image gallery using java

For the class, I am working on my first GUI. It’s just a simple image viewer with four buttons: “Previous”, “Next”, “Stop”, “Play”. The previous and next work is great, but to be honest, I don’t even know how to start work on the part of the slide show (Play and Stop). I know that there is a timer class that is likely to be useful for controlling the speed when changing images ... but I'm not sure what logic is usually used to cycle through images. Can someone point me in the right direction, my brain is a little fried at this point: 0

I have included my code below. I am new to this, so hopefully people will not criticize my technique too much. If that matters, I work in eclipse.

here is my code:

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


public class ImageGallery extends JFrame
{
    private ImageIcon myImage1 = new ImageIcon ("Chrysanthemum.jpg");
    private ImageIcon myImage2 = new ImageIcon ("Desert.jpg");
    private ImageIcon myImage3 = new ImageIcon ("Jellyfish.jpg");
    private ImageIcon myImage4 = new ImageIcon ("Penguins.jpg");
    JPanel ImageGallery = new JPanel();
    private ImageIcon[] myImages = new ImageIcon[4];
    private int curImageIndex=0;

    public ImageGallery ()
        {   
            ImageGallery.add(new JLabel (myImage1));
            myImages[0]=myImage1;
            myImages[1]=myImage2;
            myImages[2]=myImage3;
            myImages[3]=myImage4;

            add(ImageGallery, BorderLayout.NORTH);

            JButton PREVIOUS = new JButton ("Previous");
            JButton PLAY = new JButton ("Play");
            JButton STOP = new JButton ("Stop");
            JButton NEXT = new JButton ("Next");

            JPanel Menu = new JPanel();
            Menu.setLayout(new GridLayout(1,4));
            Menu.add(PREVIOUS);
            Menu.add(PLAY);
            Menu.add(STOP);
            Menu.add(NEXT);

            add(Menu, BorderLayout.SOUTH);

            //register listener
            PreviousButtonListener PreviousButton = new PreviousButtonListener ();
            PlayButtonListener PlayButton = new PlayButtonListener ();
            StopButtonListener StopButton = new StopButtonListener ();
            NextButtonListener NextButton = new NextButtonListener ();

            //add listeners to corresponding componenets 
            PREVIOUS.addActionListener(PreviousButton);
            PLAY.addActionListener(PlayButton);
            STOP.addActionListener(StopButton);
            NEXT.addActionListener(NextButton);

        }

    public static void main (String [] args)
        {
            ImageGallery frame = new ImageGallery();

            frame.setSize(490,430);
            frame.setVisible(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLocationRelativeTo(null);
        }



    class PreviousButtonListener implements ActionListener 
    {

        public void actionPerformed(ActionEvent e)
            {
                if(curImageIndex>0 && curImageIndex <= 3)
                    {   ImageGallery.remove(0);
                        curImageIndex=curImageIndex-1;
                        ImageIcon TheImage= myImages[curImageIndex];
                        ImageGallery.add(new JLabel (TheImage));
                        ImageGallery.validate();
                        ImageGallery.repaint(); 
                    }
                else 
                    {   
                        ImageGallery.remove(0);
                        ImageGallery.add(new JLabel (myImage1));
                        curImageIndex=0;
                        ImageGallery.validate();
                        ImageGallery.repaint();
                    }
            }
    }

    class PlayButtonListener implements ActionListener 
    {
        public void actionPerformed(ActionEvent e)
            {
                        // *need help here*//

            }
    }

    class StopButtonListener implements ActionListener 
    {
        public void actionPerformed(ActionEvent e)
            {
                        // *need help here*//
            }
    }

    class NextButtonListener implements ActionListener 
    {


        public void actionPerformed(ActionEvent e)
        {

            if(curImageIndex>=0 && curImageIndex < 3)
                {   ImageGallery.remove(0);
                    curImageIndex = curImageIndex + 1;
                    ImageIcon TheImage= myImages[curImageIndex];
                    ImageGallery.add(new JLabel (TheImage));
                    ImageGallery.validate();
                    ImageGallery.repaint(); 
                }
            else 
                {   
                    ImageGallery.remove(0);
                    ImageGallery.add(new JLabel (myImage4));
                    curImageIndex=3;
                    ImageGallery.validate();
                    ImageGallery.repaint();
                }

        }
    }
}
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4 answers

Here are some guidelines to get you started:

First you need a separate thread to manage changing images. I suggest you write a class that implements TimerTask . Override the run () method in this class. In this startup method, you must put the functionality to change the displayed current image (similar to what you did in the next and previous functions).

actionPerformed() Timer scheduleAtFixedRate (TimerTask task, long delay, long period) ( , useAtFixedRate() , ).

, cancel() Timer

0

,

+4

This example shows the start / stop button that controls javax.swing.Timer. Instead of replacing the label each time, just update the label Iconas suggested by @mKorbel, and it is shown here .

+3
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You need to use the stream for the slide show. You can use the flag in the run method to continue with the show or stop if this flag changes, for example, boolean var. You can see one example at http://java.sun.com/developer/technicalArticles/Threads/applet/ .

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