Re: trouble creating resi

  To: comp.lang.java.gui
E.D.I wrote:

Sub: trouble creating resizable jlabel with an image??

Please find your shift key and apply it once at the
start of each sentence, for every use of the word
'I' and any reference to J2SE classes (it is a JLabel,
unless you are talking about some completely
unrelated class). Also note that one question
mark denotes a question, whereas two indicates
that the person asking, is impatient and needy -
please restrict yourself to one.


This code probably answers the question of why it
is not wise to do this, better than it answers the
actual question.

<sscce>
import java.net.*;
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;

class BackgroundImageLabel extends JPanel {

  Image image;
  JLabel label;

  BackgroundImageLabel(URL imgURL, String text) {
    super( new BorderLayout() );
    image = Toolkit.getDefaultToolkit()
      .createImage( imgURL );
    MediaTracker mt = new MediaTracker(this);
    mt.addImage( image, 0 );
    try {
      mt.waitForAll();
    } catch(InterruptedException e) {
      // wake and continue..
    }
    label = new JLabel(text);
    add( label, BorderLayout.CENTER );
  }

  public void paintComponent(Graphics g) {
    g.drawImage( image,
      0,0,getWidth(),getHeight(),
      this );
    label.repaint();
  }

  public Dimension getMinimumSize() {
    Dimension labelSize = label.getMinimumSize();
    int imageWidth = image.getWidth(this);
    int imageHeight = image.getHeight(this);
    int width = ( (imageWidth/2)<labelSize.width ?
      imageWidth/2 :
      labelSize.width );
    int height = ( (imageHeight/2)<labelSize.height ?
      imageHeight/2 :
      labelSize.height );

    return new Dimension(width,height);
  }

  public Dimension getPreferredSize() {
    Dimension labelSize = label.getPreferredSize();
    int imageWidth = image.getWidth(this);
    int imageHeight = image.getHeight(this);
    int width = ( (imageWidth)<labelSize.width ?
      imageWidth :
      labelSize.width );
    int height = ( (imageHeight)<labelSize.height ?
      imageHeight :
      labelSize.height );

    return new Dimension(width,height);
  }

  public static void main(String[] args)
    throws MalformedURLException {

    URL imageURL = new URL(
      "http://java.sun.com/im/logo_sun_small_sdn.gif");
    JPanel p = new JPanel( new BorderLayout() );

    p.add( new BackgroundImageLabel(imageURL, "North Label"),
      BorderLayout.NORTH );
    p.add( new BackgroundImageLabel(imageURL, "Eastern Label"),
      BorderLayout.EAST );
    p.add( new BackgroundImageLabel(imageURL, "Western Label"),
      BorderLayout.WEST );
    p.add( new BackgroundImageLabel(imageURL, "Center Label"),
      BorderLayout.CENTER );
    p.add( new BackgroundImageLabel(imageURL, "South Label"),
      BorderLayout.SOUTH );
    p.validate();

    JOptionPane.showMessageDialog(null, p);
  }
}
</sscce>

--
Andrew Thompson
http://www.athompson.info/andrew/

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