org.eclipse.swt.snippets.Snippet152.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet152.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;

/*
 * Control example snippet: update a status line when an item is armed
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.0
 */

import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet152 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 152");
        FormLayout layout = new FormLayout();
        shell.setLayout(layout);
        final Label label = new Label(shell, SWT.BORDER);
        Listener armListener = event -> {
            MenuItem item = (MenuItem) event.widget;
            label.setText(item.getText());
            label.update();
        };
        Listener showListener = event -> {
            Menu menu = (Menu) event.widget;
            MenuItem item = menu.getParentItem();
            if (item != null) {
                label.setText(item.getText());
                label.update();
            }
        };
        Listener hideListener = event -> {
            label.setText("");
            label.update();
        };
        FormData labelData = new FormData();
        labelData.left = new FormAttachment(0);
        labelData.right = new FormAttachment(100);
        labelData.bottom = new FormAttachment(100);
        label.setLayoutData(labelData);
        Menu menuBar = new Menu(shell, SWT.BAR);
        shell.setMenuBar(menuBar);
        MenuItem fileItem = new MenuItem(menuBar, SWT.CASCADE);
        fileItem.setText("File");
        fileItem.addListener(SWT.Arm, armListener);
        MenuItem editItem = new MenuItem(menuBar, SWT.CASCADE);
        editItem.setText("Edit");
        editItem.addListener(SWT.Arm, armListener);
        Menu fileMenu = new Menu(shell, SWT.DROP_DOWN);
        fileMenu.addListener(SWT.Hide, hideListener);
        fileMenu.addListener(SWT.Show, showListener);
        fileItem.setMenu(fileMenu);
        String[] fileStrings = { "New", "Close", "Exit" };
        for (int i = 0; i < fileStrings.length; i++) {
            MenuItem item = new MenuItem(fileMenu, SWT.PUSH);
            item.setText(fileStrings[i]);
            item.addListener(SWT.Arm, armListener);
        }
        Menu editMenu = new Menu(shell, SWT.DROP_DOWN);
        editMenu.addListener(SWT.Hide, hideListener);
        editMenu.addListener(SWT.Show, showListener);
        String[] editStrings = { "Cut", "Copy", "Paste" };
        editItem.setMenu(editMenu);
        for (int i = 0; i < editStrings.length; i++) {
            MenuItem item = new MenuItem(editMenu, SWT.PUSH);
            item.setText(editStrings[i]);
            item.addListener(SWT.Arm, armListener);
        }
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

}