Image Renderer for JTable

[Lavric Daniel]

Hi! I'm new here but I want to post my solution for the ImageRenderer class:

class ImageRenderer extends DefaultTableCellRenderer {
    public  BufferedImage image;
  JLabel lbl = new JLabel();
 Image img = im();


    @Override
    public void setSize(int width, int height) {
        super.setSize(width, height);
    }


    @Override
  public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
      boolean hasFocus, int row, int column) {
    lbl.setText((String) value);
    lbl.setIcon(new ImageIcon(img));
    return lbl;
  }
     public Image im(){

  File file = new File("/home/user/image.jpg"); //can be any kind of public  String path if you want to assign more than 1 cell
        try {
        image = ImageIO.read(file);
        } catch (IOException ex) {
            Logger.getLogger(Imagine.class.getName()).log(Level.SEVERE, null, ex);
        }
//you can resize the image below any way you like 
  Image newImg = image.getScaledInstance(150, 100, Image.SCALE_SMOOTH);
  return newImg;
  }
}

[Darryl Burke]

Hi Lavric, and welcome to the Ranch! It's nice that you like to share, but in future, please don't post something new in a topic thread that's only slightly related. The thread you posted this in was titled "Resizing ImageIcon" which is not the aim of your code, so I've split it out into its own thread.

Also, please go through Code Conventions for the Java TM Programming Language where you will learn about formatting your code with consistent indents. Also, you apparently have a lot to learn about using meaningful variable and method names, and about access specifiers and encapsulation.

Finally, your code completely ignores the Object value parameter to getTableCellRendererComponent(...), setting the same image to all cells of the table, which usually isn't the purpose of a renderer. Could you tell us what you had in mind when you wrote this class?

[Lavric Daniel]

Hi again. You said

Also, you apparently have a lot to learn about using meaningful variable and method names, and about access specifiers and encapsulation.

And you are right. I am a beginner. I was searching for an ImageRenderer to set up only for a cell. But I admit that my class can only be used for a column (my mistake) as it follows:
ImageRenderer image = new ImageRenderer();
table.getColumnModel().getColumn(0).setCellRenderer(image);
And it was working, therefore I've got entusiastic, and I wanted to share. Sory, if did something wrong!
In fact I need help becouse as I was writing before, I fieger out that I need an ImageRenderer class to set up for a specific cell. I've seen a method of multirendering, or something like that, but it seems to be more complicated, and I need a lot of time to study and implement in my project.
Maybe I can get some help in this forum.

[Darryl Burke]

To render an Icon in a JTable, it is sufficient to return Icon.class from the getColumnClass(...) of either the table or its model. If desired, you can populate the model with ImageIcons created form a scaled version.

Oversimplified example SSCCE using Icons from the UI Manager:

import javax.swing.*;

public class IconTable {

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

      @Override
      public void run() {
        new IconTable().makeUI();
      }
    });
  }

  public void makeUI() {
    Object[][] data = {
      {UIManager.getIcon("OptionPane.errorIcon")},
      {UIManager.getIcon("OptionPane.informationIcon")},
      {UIManager.getIcon("OptionPane.questionIcon")},
      {UIManager.getIcon("OptionPane.warningIcon")}
    };
    Object[] headers = {"Icons"};
    JTable table = new JTable(data, headers) {

      @Override
      public Class<?> getColumnClass(int column) {
        return Icon.class;
      }
    };
    table.setRowHeight(((Icon) data[0][0]).getIconHeight() + table.getIntercellSpacing().height + 2);

    JFrame frame = new JFrame();
    frame.add(new JScrollPane(table));

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 300);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }
}

[Lavric Daniel]

Thanks Darryl, but that doesen't help me that mutch, becouse I don't know haow to use a jpg or gif image instead of an icon:
{UIManager.getIcon(new ImageIcon(newImg))} it's not working.
Thanks any way, and maybe you can help me with the procedure.

[Rob Spoor]

ImageIcon implements Icon and can load its data directly from files, resources and even the Internet (the latter two using a URL argument). And if that's not an option you can use ImageIO's read methods to get a BufferedImage, that you can either put in the table directly (as JTable has automatic support for both Icon and Image), or wrap it into an ImageIcon.

You just should use those ImageIcons directly; get rid of the UIManager.getIcon call. That was only part of Darryl's example because he didn't want to load any external images.

[Lavric Daniel]

You just should use those ImageIcons directly; get rid of the UIManager.getIcon call.

Thanks! You've made my day! It's working like a charm!