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Flex and ActionScript

Flex and ActionScript. What is Flex?. Adobe Flex is a rich Internet application framework built on top of the Flash platform Applications are built using MXML and ActionScript Applications are compiled into SWF (Flash) files

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Flex and ActionScript

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  1. Flex and ActionScript

  2. What is Flex? • Adobe Flex is a rich Internet application framework built on top of the Flash platform • Applications are built using MXML and ActionScript • Applications are compiled into SWF (Flash) files • Whether written in MXML or ActionScript, all Flex components are classes. • At compile time, MXML is precompiled to ActionScript classes, which are then compiled into the swf file format.

  3. ActionScript • Object-Oriented Programming Language • Encapsulation • Abstraction • Inheritance • Polymorphism • Reusability • Similar to JavaScript

  4. Properties • Each class has pre-defined set of properties • Example: Camera properties include bandwidth, height, width mycam=new Camera();//creates new object mycam.height=20;//setting value of property • You can define and change the properties of each object (instance) of a Class through ActionScript

  5. Methods • An action that is performed by an object • Example: Camera class has getCamera method • Calling a method mycam=new camera();//create an object mycam.getCamera(); //calling method

  6. Events • Events are actions that occur in response to user’s interaction • The technique for specifying certain actions that should be performed in response to particular events is known as event handling • Example function eventResponse(event:MouseEvent):void { // Actions performed in response to the event go here } myButton.addEventListener(MouseEvent.CLICK, eventResponse);

  7. Functions • Defining a function function functionName(){ Statement1; Statement2; } • Invoking a function functionName();

  8. Flash Media Server and ActionScript • Client-side ActionScript compiled to swf • Web Server plays swf • Server-side ActionScript code is invoked • Sever loads application

  9. Client-side and server-side objects

  10. Connection Flow

  11. Calling client-side function from server-side code

  12. Calling server-side function from client-side code

  13. Client-side calls on the left invoke server-side calls on the right

  14. Server-side calls on the left invoke client-side calls on the right

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