How to access About, Preferences and Quit menus on carbon. : WIN32 « SWT « Java Tutorial

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Java Tutorial » SWT » WIN32 
17. 127. 8. How to access About, Preferences and Quit menus on carbon.
/*******************************************************************************
 * 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, (short00, kHICommandAbout);
      OS.CFRelease(str);

      // add separator between About & Preferences
      OS.InsertMenuItemTextWithCFString(menu, 0(short1, 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();
      }
    });
  }
}
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17. 127. 8. How to access About, Preferences and Quit menus on carbon.
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