Re: Changing JButton icon when pressed

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.gui
Date:
Wed, 03 May 2006 11:55:52 -0700
Message-ID:
<_076g.30311$oz1.20868@newsfe06.phx>
jill.mcafee@vanderbilt.edu wrote:

Knute - Thank you so much for your response and advice. I altered the
the ActionListener to call the setIcon() method, as follows:

  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand().equals("Center")) {
      zoomlevel = defaultzoomlevel;
    }
    else if (e.getActionCommand().equals("ZoomIn")) {
      if (zoomlevel > 1) {
        zoomlevel = zoomlevel - 1;
      }
      ZoomInButton.setIcon(ZoomInSel);
    }
    else if (e.getActionCommand().equals("ZoomOut")) {
      if (zoomlevel < 5) {
        zoomlevel = zoomlevel + 1;
      }
    }
    zoom.repaint();
  }

At this point, I am just trying to get the button to change, and stay
changed, when I click it. The button will stay the "selected" color
until I move the mouse off the button, and then it changes back to the
unselected color. Any ideas?

Jill


Jill:

I can't really tell what you are doing without the actual code or a
simplified example. If your buttons are responding to mouse events
though it must be happening in a mouse listener not the action listener.
   You shouldn't need to call repaint() in the action listener to change
icons or colors. Below is a simplified example of how to highlight the
last button pressed. You should be able to modify this to work with
icons without much trouble.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test4 {
     static JButton b0,b1,b2;

     public static void createGUI() {
         JFrame f = new JFrame();
         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         ActionListener al = new ActionListener() {
             public void actionPerformed(ActionEvent ae) {
                 String ac = ae.getActionCommand();
                 if (ac.equals("0")) {
                     b0.setBackground(Color.BLUE);
                     b1.setBackground(Color.WHITE);
                     b2.setBackground(Color.WHITE);
                 } else if (ac.equals("1")) {
                     b0.setBackground(Color.WHITE);
                     b1.setBackground(Color.BLUE);
                     b2.setBackground(Color.WHITE);
                 } else if (ac.equals("2")) {
                     b0.setBackground(Color.WHITE);
                     b1.setBackground(Color.WHITE);
                     b2.setBackground(Color.BLUE);
                 }
             }
         };
         b0 = new JButton("0");
         b0.addActionListener(al);
         f.add(b0,BorderLayout.NORTH);
         b1 = new JButton("1");
         b1.addActionListener(al);
         f.add(b1,BorderLayout.CENTER);
         b2 = new JButton("2");
         b2.addActionListener(al);
         f.add(b2,BorderLayout.SOUTH);
         f.pack();
         f.setVisible(true);
     }

     public static void main(String[] args) {
         Runnable r = new Runnable() {
             public void run() {
                 createGUI();
             }
         };
         EventQueue.invokeLater(r);
     }
}

--

Knute Johnson
email s/nospam/knute/

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