MenuItemEnableDynamically.java Source code

Introduction

Here is the source code for MenuItemEnableDynamically.java

Source

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
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 MenuItemEnableDynamically {

    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();
    }
}