Setting a Icon to Filedialog in windows

Question

Does a FileDialog whose parent is a Frame have a icon(Frame icon) displayed on it ,on windows platform.?
Regards,
Kdsouza

Answer 1

It's a routine matter to create a GIF file with transparent pixels:
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class GIFExample {
    public static void main(String[] args) throws IOException {
        boolean ok = ImageIO.write(createImage(), "gif", new File("test.gif"));
        System.out.println("success=" + ok);
    static BufferedImage createImage() {
        IndexColorModel cm = createIndexColorModel();;
        BufferedImage im = new BufferedImage(100, 100, BufferedImage.TYPE_BYTE_INDEXED, cm);
        Graphics2D g = im.createGraphics();
        g.setColor(new Color(0,0,0,0)); //transparent
        g.fillRect(0, 0, 100, 100);
        g.setColor(Color.RED);
        g.fillRect(0, 0, 50, 50);
        g.setColor(Color.GREEN);
        g.fillRect(50, 50, 50, 50);
        g.dispose();
        return im;
    static IndexColorModel createIndexColorModel() {
        BufferedImage ex = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_INDEXED);
        IndexColorModel icm = (IndexColorModel) ex.getColorModel();
        int SIZE = 256;
        byte[] r = new byte[SIZE];
        byte[] g = new byte[SIZE];
        byte[] b = new byte[SIZE];
        byte[] a = new byte[SIZE];
        icm.getReds(r);
        icm.getGreens(g);
        icm.getBlues(b);
        java.util.Arrays.fill(a, (byte)255);
        r[0] = g[0] = b[0] = a[0] = 0; //transparent
        return  new IndexColorModel(8, SIZE, r, g, b, a);
}Notes: I took the ICM created for BufferedImage's type TYPE_BYTE_INDEXED (which is opaque) and made the first color transparent.
There are also ICM constructors where you can indicate MAGENTA is really transparent, for example, which is time-honoured, but I find
that a hack.