Source Code : Make a toggle button have radio behavior

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Make a toggle button have radio behavior

/*
 * Make a toggle button have radio behavior
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class Snippet169 {
  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Listener listener = new Listener() {
      public void handleEvent(Event e) {
        Control[] children = shell.getChildren();
        for (int i = 0; i < children.length; i++) {
          Control child = children[i];
          if (e.widget != child && child instanceof Button
              && (child.getStyle() & SWT.TOGGLE) != 0) {
            ((Button) child).setSelection(false);
          }
        }
        ((Button) e.widget).setSelection(true);
      }
    };
    for (int i = 0; i < 20; i++) {
      Button button = new Button(shell, SWT.TOGGLE);
      button.setText("B" + i);
      button.addListener(SWT.Selection, listener);
      if (i == 0)
        button.setSelection(true);
    }
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

           
       

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