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How to make radiobuttons and JList do the same thing??

Posted on 2002-07-08
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Last Modified: 2010-08-05
Hi!  I'm trying to take the text and change it to Bold, Plain, or Italic.  I can do this with radio buttons, but I am having trouble trying to make the same thing happen when trying it on the same JFrame with a JList selection.  Also, I'm trying to make the changed text display onto a label which I am also having trouble...can anyone help?  Here is my code:

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

public class Pro2 extends JFrame
{
 ///////  private JLabel labeloutput;
   private JTextField t;
   private Font plainFont,
                  boldFont,
                italicFont;
   private JRadioButton plain,
                          bold,
                                    italic;
   private ButtonGroup radioGroup;

    private JList fontList;


      private String fontNames[] =
         {"Plain", "Bold", "Italic"};

   public Pro2()
   {
      super("Font Manipulator");

      Container c = getContentPane();
      c.setLayout(new FlowLayout());


      JMenuBar bar = new JMenuBar();
      JMenu fileMenu = new JMenu( "File" );
      JMenu helpMenu = new JMenu( "Help" );
      bar.add( fileMenu );
      bar.add( helpMenu );
      setJMenuBar( bar );


/////  labeloutput = new JLabel( "", 25);
/////  labeloutput.setHorizontalTextPosition( SwingConstants.CENTER );
/////  labeloutput.setVerticalTextPosition( SwingConstants.TOP );
      t = new JTextField("", 25);
/////  c.add(labeloutput);
      c.add(t);

      // Create radio buttons
      plain = new JRadioButton("Plain", true);
      c.add(plain);
      bold = new JRadioButton("Bold", false);
      c.add(bold);
      italic = new JRadioButton("Italic", false);
      c.add(italic);

      // register events
      RadioButtonHandler handler = new RadioButtonHandler();
      plain.addItemListener(handler);
      bold.addItemListener(handler);
      italic.addItemListener(handler);

      // create logical relationship between JRadioButtons
      radioGroup = new ButtonGroup();
      radioGroup.add(plain);
      radioGroup.add(bold);
      radioGroup.add(italic);

      plainFont = new Font("TimesRoman", Font.PLAIN, 14);
      boldFont = new Font("TimesRoman", Font.BOLD, 14);
      italicFont = new Font("TimesRoman", Font.ITALIC, 14);

  ///////////labeloutput.setFont(plainFont);
      t.setFont(plainFont);



      // create a list with the items in the fontNames array
        fontList = new JList(fontNames);
        fontList.setVisibleRowCount(1);

        // do not allow multiple selections
        fontList.setSelectionMode(
            ListSelectionModel.SINGLE_SELECTION);

        // add a JScrollPane containing the JList
        // to the content pane
        c.add(new JScrollPane(fontList));

              // set up event handler
///   private class RadioButtonHandler implements ItemListener {
///   public void itemStateChanged(ItemEvent e)
       // /fontList.addListSelectionListener(
       // /    new ListSelectionListener() {

      private class RadioButtonHandler implements ItemListener  {
        public void valueChanged(ListSelectionEvent e)
                    {
                       //c.setBackground(
                       //   colors[fontList.getSelectedIndex()]);
                     if (fontList.getSelectedIndex() == "Plain")
                                           //t = labeloutput;
                                     //labeloutput.setFont(plainFont);
                               t.setFont(plainFont);
                          else if (fontList.getSelectedIndex() == "Bold")
                                           //t = labeloutput;
                                           //labeloutput.setFont(boldFont);
                                   t.setFont(boldFont);
                               else if (fontList.getSelectedIndex() == "Italic")
                                           //t = labeloutput;
                                           //labeloutput.setFont(italicFont);
                                   t.setFont(italicFont);

                                        //labeloutput.repaint();
                                 t.repaint();

                    }
                 }
          );

      setSize(400, 400);
      show();
   }  // RadioButtonTest()

   public static void main(String args[])
   {
      Pro2 app = new Pro2();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing(WindowEvent e)
            {
               System.exit(0);
            }
         }
      );
   }

   private class RadioButtonHandler implements ItemListener {
      public void itemStateChanged(ItemEvent e)
      {
         if (e.getSource() == plain)
            //t = labeloutput;
            //labeloutput.setFont(plainFont);
            t.setFont(plainFont);
         else if (e.getSource() == bold)
            //t = labeloutput;
            //labeloutput.setFont(boldFont);
            t.setFont(boldFont);
         else if (e.getSource() == italic)
            //t = labeloutput;
            //labeloutput.setFont(italicFont);
            t.setFont(italicFont);

         //labeloutput.repaint();
         t.repaint();
      }
   }
}  // RadioButtonTest class

A fix to the code would be nice..
Thank you!!
0
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Question by:Redtracer
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8 Comments
 
LVL 92

Expert Comment

by:objects
ID: 7137154
This won't work:

(fontList.getSelectedIndex() == "Plain")

Instean do:

("Plain".equals(fontList.getSelectedValue())
0
 
LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 7137165
So the method should look something like this:

public void valueChanged(ListSelectionEvent e)
{
   String selected = fontList.getSelectedValue();
   if ("Plain".equals(selected))
   {
     t.setFont(plainFont);
   }
   else if ("Bold".equals(selected))
   {
     t.setFont(boldFont);
   }
   else if ("Italic".equals(selected))
   {
     t.setFont(italicFont);
   }
   t.repaint();
}
0
 
LVL 3

Expert Comment

by:yasser_helmy
ID: 7138209
The handler would look like this:
private class RadioButtonHandler implements ItemListener {
     public void itemStateChanged(ItemEvent e)
     {int selectedFont= fontList.getSelectedIndex();
        if (selectedFont == 0)
           t.setFont(plainFont);
        else if (selectedFont == 1)
           t.setFont(boldFont);
        else if (selectedFont == 2)
           t.setFont(italicFont);
     }
}
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LVL 92

Expert Comment

by:objects
ID: 7139038
That assumes that the array of font styles remains the same :-) Testing the actual value makes it more flexible, as the array order can be altered without affecting any other code.
0
 
LVL 3

Expert Comment

by:yasser_helmy
ID: 7140335
> That assumes that the array of font styles remains the same

If you want more flexibility you can change the code to:
private class RadioButtonHandler implements ItemListener {
    public void itemStateChanged(ItemEvent e)
    {Object selectedFont= fontList.getSelectedValue();
       if (selectedFont.equals("Plain"))
          t.setFont(plainFont);
       else if (selectedFont.equals("Bold"))
          t.setFont(boldFont);
       else if (selectedFont.equals("Italic"))
          t.setFont(italicFont);
    }
}
0
 
LVL 92

Expert Comment

by:objects
ID: 7140362
Thats exactly what I posted??
Except that it will crash if nothing is selected.
0
 

Author Comment

by:Redtracer
ID: 7170206
Sorry it took so long to award points!  I just had to try the code and verify it...your solution helped very much.  Thanks

Redtracer
0
 
LVL 92

Expert Comment

by:objects
ID: 7170560
Why only a 'B'.

Thanks for the points :-)

http://www.objects.com.au/staff/mick
Brainbench MVP for Java 1
http://www.brainbench.com
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