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From: "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this>
Subject: Re: loop through all cont
Message-ID: <742a248e4f099@uwe>
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Date: Wed, 27 Apr 2011 15:35:56 GMT
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  To: comp.lang.java.gui
Adam Sandler wrote:
.
>...In my Java
>app, if I have 5 checkboxes on a panel, I would prefer to pass just
>the panel to my method for processing (and have checkbox state
>determined there) rather than myMethod (cb1, cb2, cb3, cb4, cb5).

It sounds like a terrible design, but..

>How is this done in Java?

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

/**
A starting point for iterating the controls of
a container.
*/
class IterateControls {

  public static void printChildren(Container c) {
    Component[] children = c.getComponents();
    for ( int ii=0; ii<children.length; ii++ ) {
      if (children[ii].isFocusable()) {
        try {
          Container child = (Container)children[ii];
          /* if this is also a container, check its
          children as well */
          printChildren( child );
          System.out.println( children[ii].getClass() );
        } catch (ClassCastException cce ) {
          System.out.println( children[ii] );
        }
      }
    }
  }

  public static void main(String[] args) {
    JPanel mainPanel =
      new JPanel(new BorderLayout(5,5));

    mainPanel.add( new JScrollPane( new JTree() ),
      BorderLayout.WEST );
    mainPanel.add( new JLabel("message label"),
      BorderLayout.SOUTH );
    mainPanel.add( new JScrollPane(
      new JTextArea("Output..", 5 ,20) ),
      BorderLayout.CENTER );

    JPanel checkBoxPanel =
      new JPanel( new GridLayout(0,1) );
    for (int ii=0; ii<3; ii++) {
      checkBoxPanel.add(
        new JCheckBox("Checkbox " +
          (ii+1), (ii%2==0)) );
    }
    mainPanel.add( checkBoxPanel, BorderLayout.EAST );
    mainPanel.validate();

    printChildren( mainPanel );

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

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

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