How to implement JCheckBox inside JButton?

[s1w]

I was trying some solutions, and every of them failed. Until now, I had thought that anything is possible in Java. One of my solution, that don't makes compilation warrning and runs (but checkbox is missing anyway) is:

  class myCheckBox extends JCheckBox implements Icon {
      int w = 20;

      public myCheckBox() {
        super();
        setSelected(true);
        setFocusPainted(false);
        setOpaque(false);
        setToolTipText(" close route ");
        addItemListener(new ItemListener() {
           public void itemStateChanged(ItemEvent e) {
              if (e.getStateChange() == ItemEvent.SELECTED) { }
           }
        });
      }

      public void paintIcon(Component c, Graphics g, int x, int y) { }

      public int getIconWidth() { return w; }
      public int getIconHeight() { return w; }
  }

then

  myCheckBox CB = new myCheckBox();
  button.setIcon(CB);

Any tryings of creating own button class with own content manager fails as well. Any ideas to solve this?

[DarrylBurke]

You have a class that implements Icon but has an empty paintIcon(...) method. Doesn't make sense, that.

Describe the user interaction with your custom composite component. What happens on button click? What determines whether the check box will be selected / unselected?

Without knowing that, I can't make any design suggestion.

db

[camickr]

Not sure I understand the usage of this component either, but maybe Component Border « Java Tips Weblog will work for you.

[DarrylBurke]

Here's one interpretation, assuming the checked status is separately set externally.

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

public class CheckButtonDemo {

  public static void main(String[] args) throws Exception {
    SwingUtilities.invokeLater(new Runnable() {

      @Override
      public void run() {
        new CheckButtonDemo().makeUI();
      }
    });
  }

  public void makeUI() {
    final CheckButton checkButton = new CheckButton("TSP ROUTE");

    JFrame frame = new JFrame();
    frame.setLayout(new FlowLayout());
    frame.add(checkButton);
    frame.pack();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

    new Timer(750, new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        checkButton.setChecked(!checkButton.isChecked());
      }
    }).start();
  }
}

class CheckButton extends JButton {

  private JCheckBox checkBox = new JCheckBox();

  public CheckButton(String text) {
    super(text);
    setHorizontalTextPosition(LEFT);
    setIcon(new Icon() {

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

      @Override
      public void paintIcon(Component c, Graphics g, int x, int y) {
        checkIcon.paintIcon(checkBox, g, x, y);
      }

      @Override
      public int getIconWidth() {
        return checkIcon.getIconWidth();
      }

      @Override
      public int getIconHeight() {
        return checkIcon.getIconHeight();
      }
    });
  }

  public void setChecked(boolean checked) {
    checkBox.setSelected(checked);
    repaint();
  }

  public boolean isChecked() {
    return checkBox.isSelected();
  }
}

db

[s1w]

DarrylBruke, your answer source is greatly valuable for my experience. In addition, I had received solution unbelivable trivial from other forum...

JCheckBox jcb = new JCheckBox();
button.add(jcb);

Thank You guys, advanced handling Icon solution teached me something as well. Good day!

[DarrylBurke]

You still haven't answered this:

Describe the user interaction with your custom composite component. What happens on button click? What determines whether the check box will be selected / unselected?

db

[s1w]

Its about using Travelling Salesman Algorithm etc; there is limited space on toolbar, and checkbox role is, when its unselected, route is not closing at final connection/in kruskal's or prim's version last connection is being made as addition, which in some cases of application needs is not compulsory
sorry for my english if its not perfect

edit:
while ive learned that all components in java are containers, simple adding jchkbox to jbutton makes both accessible by user, and works great. Thanks again for Your inquiry