Snippet178.java Source code

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/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 *******************************************************************************/

/*
 * How to access About, Preferences and Quit menus on carbon.
 * NOTE: This snippet uses internal SWT packages that are
 * subject to change without notice.
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */

import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.carbon.*;

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

public class Snippet178 {

    private static final int kHICommandPreferences = ('p' << 24) + ('r' << 16) + ('e' << 8) + 'f';

    private static final int kHICommandAbout = ('a' << 24) + ('b' << 16) + ('o' << 8) + 'u';

    private static final int kHICommandServices = ('s' << 24) + ('e' << 16) + ('r' << 8) + 'v';

    public static void main(String[] arg) {
        Display.setAppName("AppMenu"); // sets name in Dock
        Display display = new Display();
        hookApplicationMenu(display, "About AppMenu");
        Shell shell = new Shell(display);
        shell.setText("Main Window");
        shell.open();
        while (!shell.isDisposed())
            if (!display.readAndDispatch())
                display.sleep();

        display.dispose();
    }

    static void hookApplicationMenu(Display display, final String aboutName) {
        // Callback target
        Object target = new Object() {
            int commandProc(int nextHandler, int theEvent, int userData) {
                if (OS.GetEventKind(theEvent) == OS.kEventProcessCommand) {
                    HICommand command = new HICommand();
                    OS.GetEventParameter(theEvent, OS.kEventParamDirectObject, OS.typeHICommand, null,
                            HICommand.sizeof, null, command);
                    switch (command.commandID) {
                    case kHICommandPreferences:
                        return handleCommand("Preferences"); //$NON-NLS-1$
                    case kHICommandAbout:
                        return handleCommand(aboutName);
                    default:
                        break;
                    }
                }
                return OS.eventNotHandledErr;
            }

            int handleCommand(String command) {
                Shell shell = new Shell();
                MessageBox preferences = new MessageBox(shell, SWT.ICON_WARNING);
                preferences.setText(command);
                preferences.open();
                shell.dispose();
                return OS.noErr;
            }
        };

        final Callback commandCallback = new Callback(target, "commandProc", 3); //$NON-NLS-1$
        int commandProc = commandCallback.getAddress();
        if (commandProc == 0) {
            commandCallback.dispose();
            return; // give up
        }

        // Install event handler for commands
        int[] mask = new int[] { OS.kEventClassCommand, OS.kEventProcessCommand };
        OS.InstallEventHandler(OS.GetApplicationEventTarget(), commandProc, mask.length / 2, mask, 0, null);

        // create About ... menu command
        int[] outMenu = new int[1];
        short[] outIndex = new short[1];
        if (OS.GetIndMenuItemWithCommandID(0, kHICommandPreferences, 1, outMenu, outIndex) == OS.noErr
                && outMenu[0] != 0) {
            int menu = outMenu[0];

            int l = aboutName.length();
            char buffer[] = new char[l];
            aboutName.getChars(0, l, buffer, 0);
            int str = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, buffer, l);
            OS.InsertMenuItemTextWithCFString(menu, str, (short) 0, 0, kHICommandAbout);
            OS.CFRelease(str);

            // add separator between About & Preferences
            OS.InsertMenuItemTextWithCFString(menu, 0, (short) 1, OS.kMenuItemAttrSeparator, 0);

            // enable pref menu
            OS.EnableMenuCommand(menu, kHICommandPreferences);

            // disable services menu
            OS.DisableMenuCommand(menu, kHICommandServices);
        }

        // schedule disposal of callback object
        display.disposeExec(new Runnable() {
            public void run() {
                commandCallback.dispose();
            }
        });
    }
}