CheckBox icon

Hello

the following code shows a JCheckBox that changes its background color when selected, thus serving as an eye-catcher in a setting with several columns of check boxes.
The only thing I would improve is that the ceckbox should keep the normal ocean LAF when they are disabled. Even when I comment out the special colouring and just do a super.paintIcon (...), it remains flat gray. No idea why?

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

public class HighlightedCheckBox extends JFrame {
  JCheckBox cbx;

  public HighlightedCheckBox() {
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setSize(300,200);
    setLayout(new FlowLayout(FlowLayout.LEFT, 40, 40));
    cbx= new JCheckBox("The modified checkbox");
    HighlightOnSelectIcon icon= new HighlightOnSelectIcon(cbx);
    cbx.setIcon(icon);
    JCheckBox cb= new JCheckBox("Above checkbox enabled", true);
    cb.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
     cbx.setEnabled(!cbx.isEnabled());
      }
    });
    add(cbx);
    add(cb, BorderLayout.SOUTH);
    setVisible(true);
  }


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


  class HighlightOnSelectIcon extends javax.swing.plaf.metal.MetalCheckBoxIcon {
    JCheckBox cb;

    public HighlightOnSelectIcon(JCheckBox cb) {
      this.cb= cb;
    }

    protected void drawCheck(Component c, Graphics g, int x, int y) {
      g.setColor(Color.BLACK);
      super.drawCheck(c,g,x,y);
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
//      if (cb.isSelected()) g.setColor(Color.GREEN);
//      g.fillRect(x,y,getIconWidth()-3,getIconHeight()-1);
      super.paintIcon(c,g,x,y);
    }
  }

}

Extend the wrong class. javax.swing.plaf.metal.MetalCheckBoxIcon is a vestige of days before the ocean; the box used by ocean icon is javax.swing.plaf.metal.MetalIconFactory.CheckBoxIcon - you can't expand, as is a private static class.

If appearance is important to you, you could encapsulate an icon from the UIManager. Maybe something like

  class HighlightOnSelectIcon extends javax.swing.plaf.metal.MetalCheckBoxIcon {

    private Icon wrappedIcon = UIManager.getIcon("CheckBox.icon");

    @Override
    protected void drawCheck(Component c, Graphics g, int x, int y) {
      g.setColor(Color.BLACK);
      super.drawCheck(c, g, x, y);
    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
      wrappedIcon.paintIcon(c, g, x, y);
      JCheckBox cb = (JCheckBox) c;
      if (cb.isSelected()) {
        g.setColor(Color.GREEN);
        g.fillRect(x, y, getIconWidth() - 3, getIconHeight() - 1);
        drawCheck(c, g, x, y);
      }
    }
  }

Oh, and the icon is designed as a shared resource. This is why paintIcon is passed to the component to which the icon should be painted. There is no need to maintain a reference to the JCheckBox as an instance field.

Tags: Java

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