Discovering Rhapsody

DISCOVERING OPENSTEP: A Developer Tutorial Rhapsody Developer Release Apple Computer, Inc. User Interface Tips copyright © 1997 Apple Computer, Inc. All rights reserved. [6467.00] No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, mechanical, electronic, photocopying, recording, or otherwise, without prior written permission of Apple Computer, Inc., except to make a backup copy of any documentation provided on CD-ROM. Printed in the United States of America. The Apple logo is a trademark of Apple Computer, Inc. Use of the “keyboard” Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. No licenses, express or implied, are granted with respect to any of the technology described in this book. Apple retains all intellectual property rights associated with the technology described in this book. This book is intended to assist application developers to develop applications only for Apple-labeled or Apple-licensed computers. Every effort has been made to ensure that the information in this manual is accurate. Apple is not responsible for printing or clerical errors. Apple Computer, Inc. 1 Infinite Loop Cupertino, CA 95014 408-996-1010 Apple, and the Apple logo are trademarks of Apple Computer, Inc., registered in the United States and other countries. NeXT, the NeXT logo, NEXTSTEP, the NEXTSTEP logo, Digital Librarian, NeXTmail, and Workspace Manager are trademarks of NeXT Computer, Inc. All other trademarks mentioned belong to their respective owners. Written by: Terry Donoghue Tutorial applications by: Terry Donoghue Art and Production: Terri FitzMaurice Publications management: Ron Hayden With help from: Trey Matteson, Ron Hayden, Jean Ostrem, Lynn Cox, Derek Clegg, Mike Ferris, and Frederic Bonnard Table of Contents Welcome to Rhapsody 7 Extending the To Do Application 167 Overriding Behavior of an Application Kit Class: An Example 170 A Simple Application 19 Creating and Managing an Inspector (ToDoInspector) 172 Creating the Currency Converter Project 22 Overriding and Adding Behavior to a Class: An Example 190 Creating the Currency Converter Interface 24 Setting Up Timers 196 Customizing the Application’s Window 24 Build, Run, and Extend the Application 199 Fields and Buttons 28 Optional Exercises 199 Some Finishing Touches 32 Defining the Classes of Currency Converter 38 Appendix A - Object-Oriented Programming 203 Connecting ConverterController to the Interface 44 Encapsulation 205 Building the Currency Conve…