org.eclipse.swt.snippets.Snippet348.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet348.java

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/*******************************************************************************
 * Copyright (c) 2010, 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;

/*
 * Display snippet: slightly more complex example for Display.getMenuBar() (compared to Snippet347)
 * Shows how to write a more cross-platform multi-window application using Display.getMenuBar().
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.7
 */
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.widgets.*;

public class Snippet348 {

    static boolean createdScreenBar = false;

    static void createMenuBar(Shell s) {
        Menu bar = Display.getCurrent().getMenuBar();
        boolean hasAppMenuBar = (bar != null);
        if (bar == null) {
            bar = new Menu(s, SWT.BAR);
        }

        // Populate the menu bar once if this is a screen menu bar.
        // Otherwise, we need to make a new menu bar for each shell.
        if (!createdScreenBar || !hasAppMenuBar) {
            MenuItem item = new MenuItem(bar, SWT.CASCADE);
            item.setText("File");
            Menu menu = new Menu(item);
            item.setMenu(menu);
            menu.addMenuListener(new MenuListener() {

                @Override
                public void menuHidden(MenuEvent e) {
                    System.out.println("Menu closed: " + e);
                }

                @Override
                public void menuShown(MenuEvent e) {
                    System.out.println("Menu open: " + e);
                }

            });
            MenuItem newWindow = new MenuItem(menu, SWT.PUSH);
            newWindow.setText("New Window");
            newWindow.setAccelerator(SWT.MOD1 | 'N');
            newWindow.addListener(SWT.Selection, event -> {
                Shell s1 = createShell();
                s1.open();
            });
            if (!SWT.getPlatform().equals("cocoa")) {
                MenuItem exit = new MenuItem(menu, SWT.PUSH);
                exit.setText("Exit");
                exit.addListener(SWT.Selection, event -> {
                    Display d = Display.getCurrent();
                    Shell[] shells = d.getShells();
                    for (Shell shell : shells) {
                        shell.close();
                    }
                });
            }
            if (!hasAppMenuBar)
                s.setMenuBar(bar);
            createdScreenBar = true;
        }
    }

    static Shell createShell() {
        final Shell shell = new Shell(SWT.SHELL_TRIM);
        shell.setText("Snippet 348");
        createMenuBar(shell);

        shell.addDisposeListener(e -> {
            Display d = Display.getCurrent();
            Menu bar = d.getMenuBar();
            boolean hasAppMenuBar = (bar != null);
            if (!hasAppMenuBar) {
                shell.getMenuBar().dispose();
                Shell[] shells = d.getShells();
                if ((shells.length == 1) && (shells[0] == shell)) {
                    if (!d.isDisposed())
                        d.dispose();
                }
            }
        });

        return shell;
    }

    public static void main(String[] args) {
        final Display display = new Display();

        Shell shell = createShell();
        shell.open();

        while (!display.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }
}