org.eclipse.swt.snippets.Snippet73.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet73.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Menu example snippet: enable menu items dynamically (when menu shown)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet73 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 73");
        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, 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);
            }
        });
        Rectangle clientArea = shell.getClientArea();
        tree.setBounds(clientArea.x, clientArea.y, 200, 200);
        shell.setSize(300, 300);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}