Essential ActionScript 3.0 (Essential) by Colin Moock
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The emphasis in the earlier chapters, particularly on Commands and Tools is on time saving and efficiencytaking those simple but tedious tasks and creating something that automates them. As the book moves into Timeline Effects and Behaviors, the emphasis switches to having the power to do very complex things with the push of a button.
All of these extensibility tools rely mainly on two new features: the JavaScript API (JSFL) and the XML to UI API. Although these are essentially based on JavaScript and XML, there are so many new objects, methods, and properties that it is actually like learning a new language (there are over 270 methods in the JS API.) As the book progresses through the sections, parts of the APIs will be introduced as needed. No particular knowledge of JavaScript or XML should be necessary, although some level of experience with programming or ECMA scripting, i.e. anyone beyond the beginner levels of ActionScript should be fine.
By the end of the behaviors section, you should be quite comfortable with both APIs, the syntax, the overall object model, and concept of how to program in JSFL or XMLtoUI. The final section of the book is an in-depth reference guide to all of the objects, methods, and properties contained in both APIs, and a DOM (Document Object Model) chart of the JavaScript APIa family tree showing how it all fits together.
The fundamental idea of this is that the book is not only an early adopter guide to a new technology, but also a valuable reference guide that you can refer to as they are writing new extensions.
Synopsis
Get up to speed with the latest Flash technology Create new Flash extensions Enhance your production workflow Background: With the release of Flash MX 2004, Macromedia has given us a brand-new Extensibility architecture layer, which lets us look under the hood of Flash and extend its functionality. With the extensibility tools, which include behaviors, custom-made tools and commands, the JavaScript API (or JSFL), and the XML-to-UI API, you can literally extend Flash to do things it cannot do out of the box. Things such as adding new custom commands to the menu and customizing the tool bar, adding brand new, custom created tools. The commands could be as simple as drawing a commonly used shape on the stage, or as complex as creating an entire new Flash movie from scratch. These new features will not only allow users to share code and effects more easily within the community or a production environment, but will also allow developers to package up and reuse more within Flash than was ever possible before, increasing productivity and decreasing production times.We now have the ability to take our designs further than ever before--if you have an idea for a new feature, you can just create it yourself and "plug it in".

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