Change icons in JFileChooser

[Robert Ingmarsson]

Hello, ranch!

I was wondering if there is a way to change the default icons in JFileChooser? In my case i wan't to
change the icons for image files into native system icons for that type of files. I know it is possible to
do this via the UIManager class with the setLookAndFeel method but i just wan't to change specific icons
in JFileChooser more to the point those that represents image files.

Is it possible to do this with the FileSystemView or FileView classes in the filechooser package or am
i missing something if so i do apologize? So far I have begun to look closer into the FileSystemView and
FileView classes or am i completely on the wrong track?

Thanks a lot in advance!

Best regards,
Robert.

[Tony Docherty]

Yes I believe you can do this by extending FileView to create your own FileView class that returns the appropriate icon (from the getIcon() method) or return null to use the default icon. You register your FileView object through the setFileView method in JFileChooser.

[Campbell Ritchie]

Good to see you again, Tony.

I think this discussion would sit better in our GUIs forum. Moving.

[Robert Ingmarsson]

Tony Docherty wrote:Yes I believe you can do this by extending FileView to create your own FileView class that returns the appropriate icon (from the getIcon() method) or return null to use the default icon. You register your FileView object through the setFileView method in JFileChooser.

 

Thanks a lot for this answer. It seems i am on the right track to accomplish this task that i have taken upon me to achieve.

Best regards,
Robert!

[Robert Ingmarsson]

Hello, ranch!

This thread is now solved this is the code i used to change only image file icons to native system icons.

package util;

import gui.ImageAccessoryPanel;
import java.io.File;
import javax.swing.Icon;
import javax.swing.filechooser.FileSystemView;
import javax.swing.filechooser.FileView;

public class CustomFileView extends FileView {

    private final ImageAccessoryPanel panel;
    
    public CustomFileView(ImageAccessoryPanel panel) {
        
        this.panel = panel;
        
    }
    
    public Icon getIcon(File f) {
        
        if (panel.isImageFile(f)) {
        
            return FileSystemView.getFileSystemView().getSystemIcon(f);
    
        }
        
        return null;
        
    }
}

public boolean isImageFile(File f) {
        
        boolean returnValue = false;
        String fileName = f.getName().toLowerCase();
        
        if (fileName.endsWith("jpeg")) { returnValue = true; }
        if (fileName.endsWith("jpg")) { returnValue = true; }
        if (fileName.endsWith("png")) { returnValue = true; }
        if (fileName.endsWith("svg")) { returnValue = true; }
        if (fileName.endsWith("gif")) { returnValue = true; }
        
        return returnValue;
        
    }

[Campbell Ritchie]

Robert Ingmarsson wrote:. . . This thread is now solved . . .

I'm not convinced.

public boolean isImageFile(File f) {
        
        boolean returnValue = false;
        String fileName = f.getName().toLowerCase();
        
        if (fileName.endsWith("jpeg")) { returnValue = true; }
        if (fileName.endsWith("jpg")) { returnValue = true; }
        if (fileName.endsWith("png")) { returnValue = true; }
        if (fileName.endsWith("svg")) { returnValue = true; }
        if (fileName.endsWith("gif")) { returnValue = true; }
        
        return returnValue;
        
    }

You mean

public boolean isImageFile(File f) {
        String fileName = f.getName().toLowerCase();
        
        return fileName.endsWith("jpeg") ||
               fileName.endsWith("jpg") ||
               fileName.endsWith("png") ||
               fileName.endsWith("svg") ||
               fileName.endsWith("gif");
    }

surely? Look at the old Sun style guide.
Also, there is something unusual about that method. It can legitimately be marked static, but it would probably be a good idea to mark it final, too.

[Campbell Ritchie]

A few minuste ago, I wrote:. . .

public boolean isImageFile(File f) {
        String fileName = f.getName().toLowerCase();
        
        return fileName.endsWith("jpeg") ||
               fileName.endsWith("jpg") ||
               fileName.endsWith("png") ||
               fileName.endsWith("svg") ||
               fileName.endsWith("gif");
    }

. . .

I think this would be even better:-

public boolean isImageFile(File f) {
        String fileName = f.getName().toLowerCase();
        
        return fileName.endsWith(".jpeg") ||
               fileName.endsWith(".jpg") ||
               fileName.endsWith(".png") ||
               fileName.endsWith(".svg") ||
               fileName.endsWith(".gif");
    }

[Robert Ingmarsson]

Best, Mr Ritchie!

Thank you so much for your answer and advice. I changed the method isImageFile to

public static final boolean isImageFile(File f) {
        
        String fileName = f.getName().toLowerCase();
         
        return fileName.endsWith("jpeg") ||
        fileName.endsWith("jpg") ||
        fileName.endsWith("png") ||
        fileName.endsWith("svg") ||
        fileName.endsWith("gif");
    }

... and i saw a clear advantage in my project in having this method declared static. Below is an example of code in which i use it:

if (jChooser == null) {
            this.jChooser = createJFileChooser();
        }
        
        int open = jChooser.showOpenDialog(frame);
        
        if (open == JFileChooser.APPROVE_OPTION) {
            
            File selectedFile = jChooser.getSelectedFile();
            if (selectedFile == null) return;
                        
            if (selectedFile.exists() && 
                ImageAccessoryPanel.isImageFile(selectedFile)) {                
                
                Runnable rbl = new Runnable() {
                    
                    @Override
                    public void run() {
                        
                        String location = selectedFile.getAbsolutePath();
                        ImageIcon origIcon = new ImageIcon(location);                
                        Image origImg = origIcon.getImage();
                        Image thumbImg = origImg.getScaledInstance(x,
                        y,Image.SCALE_SMOOTH);
                
                        ImageIcon thumbIcon = new ImageIcon(thumbImg);
                
                        panel.jLbImageArea.setName(location);
                        panel.jLbImageArea.setIcon(thumbIcon);
                        panel.jLbImageArea.revalidate();
                        panel.jLbImageArea.repaint();
                        
                    }
                };
                
                SwingUtilities.invokeLater(rbl);
            }
        }

Again thank you very much for your tip!

Best regards,
Robert!

[Piet Souris]

You can further simplify the code that lets you only select suitable graphic files. Have a look at the class 'FileNameExtensionFilter'. It is very easy to use.