Re: Trying to put a backg
To: comp.lang.java.gui
Sabine Dinis Blochberger wrote:
Andrew Thompson wrote:
Sabine Dinis Blochberger wrote:
Trying to put a background image in a JFrame
...
In option two, adding one JPanel with BorderLayout.EAST, the other with
BorderLayout.SOUTH, all I get is a tiny square off the window bounds.
Images load asynchonously, so maybe the image
is returning a -1,-1 size at time of pack(). One way
to fix that is to use a MediaTracker. Knute has some
good examples of loading and displaying images, here..
<http://rabbitbrush.frazmtn.com/>
The new contructor thus looks like this
//---
public BackgroundPanel(String imgName) {
try {
image = createImageIcon(imgName);
// Create a MediaTracker instance,
// to montior loading of images
final MediaTracker tracker = new MediaTracker(this);
// Register it with media tracker
tracker.addImage(image.getImage(), 1);
// Wait until all images have loaded
tracker.waitForAll();
} catch (Exception ex) { ex.printStackTrace(); }
}
//---
It didn't make a difference. The square is a few pixels large, you can
actually see part of the image on it - it's "only" cropped.
Then I tried to change the contentPanes layout, and it actually anchors
the panel as I want:
//---
private void addSimply() {
final JPanel bgPanel = new BackgroundPanel("background.png");
bgPanel.setOpaque(false);
final Container cp = getContentPane();
cp.setLayout(new BorderLayout());
cp.add(bgPanel, BorderLayout.EAST);
bgPanel.setBounds(0, 0, getWidth(), getHeight());
}
//---
However, the BackgroundPanel is now only a few pixels wide, and button 3
is not anchored to the right window edge anymore (I can live without
that though)...
Sabine:
I think I know what you want here. You want an image on the back of the
frame that will be drawn anchored to the lower right corner of that
frame. You want your components in front of that image. If I've got
that wrong you can ignore the rest of this.
What you need to do is to create a JPanel and set that as the frame's
ContentPane. That JPanel has the image drawn in the lower right corner.
Then just add your components to the JFrame as usual.
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;
public class test7 extends JPanel {
final BufferedImage bi;
public test7() throws IOException {
bi = ImageIO.read(new File("kittens.jpg"));
}
public void paintComponent(Graphics g) {
g.drawImage(bi,getWidth()-bi.getWidth(),
getHeight()-bi.getHeight(),null);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
test7 t7 = new test7();
f.setContentPane(t7);
f.add(new JButton("Button1"),c);
++c.gridx;
f.add(new JLabel("Label1"),c);
f.setSize(400,300);
f.setVisible(true);
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
});
}
}
--
Knute Johnson
email s/nospam/knute/
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