By Peter Armstrong
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Now used to be that SO DIFFICULT??
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Key Points ❂ ❂ Flex applications start with an Application tag. Flex applications can be built with very little code. SESSION 2 Dispatching and listening for events After you get past all the hype about RIAs, Flex development is distinguished by the pervasiveness of two main things: events and data binding. In this session, we’ll see how events work; in the next, we’ll explore data binding. It may seem odd to dive right into events and data binding before even looking at how Flex applications are structured, but since events and data binding are everywhere in Flex, it’s preferable to confront them right away so that the other examples aren’t mysterious.
Inheritance is the “is a” kind of reuse, in which one “child” class is a subclass of a “parent” class (or superclass), and has all of its parent’s properties and adds or overrides its own. The Flex framework has an extensive class hierarchy, defined (as all class hierarchies are) by inheritance. The IThing interface and Tester application are unchanged from session 7. The Tester application is fairly long, so I won’t show it again. as package model { public interface IThing { function get name():String; function set name(value:String):void; function getPoints():int; } } Now, one thing you might have noticed in the previous session was that there was duplicate code for setting the name.
These components communicate via data binding and by manually dispatching events. SESSION 5 Spark, Halo, and Flex 4 namespaces Before we go further, we should confront something that stares at you when you first look at a Flex 4 application: namespaces, and why we need three of them. To grasp this, we need to understand the story of Flex components. 5, 2, and 3), all the components were something called “Halo” components, since they had a nice glow. ) Anyway, since there was one set of components, they were all in the same namespace.