Source Code : Enable menu items dynamically (when menu shown)

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Enable menu items dynamically (when menu shown)

/*
 * Menu example snippet: enable menu items dynamically (when menu shown)
 *
 * 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.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class Snippet73 {

public static void main (String [] args) {
  Display display = new Display ();
  Shell shell = new Shell (display);
  final Tree tree = new Tree (shell, SWT.BORDER | SWT.MULTI);
  final Menu menu = new Menu (shell, SWT.POP_UP);
  tree.setMenu (menu);
  for (int i=0; i<12; i++) {
    TreeItem treeItem = new TreeItem (tree, SWT.NONE);
    treeItem.setText ("Item " + i);
    MenuItem menuItem = new MenuItem (menu, SWT.PUSH);
    menuItem.setText (treeItem.getText ());
  }
  menu.addListener (SWT.Show, new Listener () {
    public void handleEvent (Event event) {
      MenuItem [] menuItems = menu.getItems ();
      TreeItem [] treeItems = tree.getSelection ();
      for (int i=0; i<menuItems.length; i++) {
        String text = menuItems [i].getText ();
        int index = 0;
        while (index<treeItems.length) {
          if (treeItems [index].getText ().equals (text)) break;
          index++;
        }
        menuItems [i].setEnabled (index != treeItems.length);
      }
    }
  });
  tree.setSize (200, 200);
  shell.setSize (300, 300);
  shell.open ();
  while (!shell.isDisposed ()) {
    if (!display.readAndDispatch ()) display.sleep ();
  }
  display.dispose ();
}
} 

           
       

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