Learning Actionscript 2.0 in Flash
Total Page:16
File Type:pdf, Size:1020Kb
LEARNING ACTIONSCRIPT ™ 2.0 IN FLASH® © 2007 Adobe Systems Incorporated. All rights reserved. Learning ActionScript 2.0 in Adobe® Flash® If this guide is distributed with software that includes an end user agreement, this guide, as well as the software described in it, is furnished under license and may be used or copied only in accordance with the terms of such license. Except as permitted by any such license, no part of this guide may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording, or otherwise, without the prior written permission of Adobe Systems Incorporated. Please note that the content in this guide is protected under copyright law even if it is not distributed with software that includes an end user license agreement. The content of this guide is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Adobe Systems Incorporated. Adobe Systems Incorporated assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Please remember that existing artwork or images that you may want to include in your project may be protected under copyright law. The unauthorized incorporation of such material into your new work could be a violation of the rights of the copyright owner. Please be sure to obtain any permission required from the copyright owner. Any references to company names in sample templates are for demonstration purposes only and are not intended to refer to any actual organization. Adobe®, Flash®, FlashHelp®, Flash® Player, JRun™, Macromedia® and Shockwave® are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries. Macintosh® is a trademark of Apple Computer, Inc., registered in the United States and other countries. Windows® is either a registered trademark or a trademark of Microsoft Corporation in the United States and/or other countries. All other trademarks are the property of their respective owners. Portions of this product contain code licensed from Nellymoser. (www.nellymoser.com). Sorenson Spark™ video compression and decompression technology licensed from Sorenson Media, Inc. Flash CS3 video is powered by On2 TrueMotion video technology. © 1992-2005 On2 Technologies, Inc. All Rights Reserved. http://www.on2.com. Adobe Systems Incorporated, 345 Park Avenue, San Jose, California 95110, USA. Notice to U.S. Government End Users. The Software and Documentation are “Commercial Items,” as that term is defined at 48 C.F.R. §2.101, consisting of “Commercial Computer Software” and “Commercial Computer Software Documentation,” as such terms are used in 48 C.F.R. §12.212 or 48 C.F.R. §227.7202, as applicable. Consistent with 48 C.F.R. §12.212 or 48 C.F.R. §§227.7202-1 through 227.7202-4, as applicable, the Commercial Computer Software and Commercial Computer Software Documentation are being licensed to U.S. Government end users (a) only as Commercial Items and (b) with only those rights as are granted to all other end users pursuant to the terms and conditions herein. Unpublished-rights reserved under the copyright laws of the United States. Adobe Systems Incorporated, 345 Park Avenue, San Jose, CA 95110-2704, USA. For U.S. Government End Users, Adobe agrees to comply with all applicable equal opportunity laws including, if appropriate, the provisions of Executive Order 11246, as amended, Section 402 of the Vietnam Era Veterans Readjustment Assistance Act of 1974 (38 USC 4212), and Section 503 of the Rehabilitation Act of 1973, as amended, and the regulations at 41 CFR Parts 60-1 through 60-60, 60-250, and 60-741. The affirmative action clause and regulations contained in the preceding sentence shall be incorporated by reference. Contents Introduction . 9 Intended audience . .9 System requirements. 10 Updating Flash XML files . 10 About the documentation . .11 Additional resources . 14 Chapter 1: What’s New in Flash ActionScript . 19 New in ActionScript 2.0 and Flash Player 9.x . 19 New in ActionScript 2.0 and Flash Player 8 . 20 Changes to security model for locally installed SWF files. 28 Chapter 2: About ActionScript . 31 What is ActionScript . 32 About choosing between ActionScript 1.0 and ActionScript 2.0 . 33 Understanding ActionScript and Flash Player . 34 Chapter 3: Data and Data Types. 35 About data . 35 About data types. 36 About variables . 50 Organizing data in objects . .72 About casting . .74 Chapter 4: Syntax and Language Fundamentals . 77 About syntax, statements, and expressions . .78 About dot syntax and target paths . 82 About language punctuators . 88 About constants and keywords . 99 About statements . .103 About arrays . .125 About operators . 137 3 Chapter 5: Functions and Methods . 163 About functions and methods. 163 Understanding methods . 184 Chapter 6: Classes . 187 About object-oriented programming and Flash . 188 Writing custom class files . 196 About working with custom classes in an application . 199 Example: Writing custom classes . .223 Example: Using custom class files in Flash . .236 Assigning a class to symbols in Flash . .239 Compiling and exporting classes . 240 Understanding classes and scope . .243 About top-level and built-in classes . .246 About working with built-in classes . .256 Chapter 7: Inheritance . 263 About inheritance . .263 About writing subclasses in Flash . .265 Using polymorphism in an application . 271 Chapter 8: Interfaces . 275 About interfaces. .275 Creating interfaces as data types. 280 Understanding inheritance and interfaces . .282 Example: Using interfaces . .283 Example: Creating a complex interface . .285 Chapter 9: Handling Events . 291 About ActionScript and events . .292 Using event handler methods . .293 Using event listeners. .296 Using event listeners with components . .298 Using button and movie clip event handlers . 300 Broadcasting events from component instances. 305 Creating movie clips with button states . 305 Event handler scope . 306 Scope of the this keyword . 310 Using the Delegate class . 310 4Contents Chapter 10: Working with Movie Clips . 313 About controlling movie clips with ActionScript . .314 Calling multiple methods on a single movie clip . .316 Loading and unloading SWF files . .316 Changing movie clip position and appearance . .319 Dragging movie clips . 320 Creating movie clips at runtime . .321 Adding parameters to dynamically created movie clips. 325 Managing movie clip depths . 327 About caching and scrolling movie clips with ActionScript . 330 Using movie clips as masks . 337 Handling movie clip events. 339 Assigning a class to a movie clip symbol. 339 Initializing class properties . 340 Chapter 11: Working with Text and Strings . 343 About text fields . 344 About loading text and variables into text fields . 353 Using fonts . 359 About font rendering and anti-alias text . 367 About text layout and formatting. 375 Formatting text with Cascading Style Sheet styles.