By Doug McCune, Deepa Subramaniam
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Additional info for Adobe Flex 3.0 For Dummies (For Dummies (Computer Tech))
Creating the Hello World application You know that you want to create a Flex application that simply displays Hello World when it’s run. The Flex framework has a variety of user interface controls that can be used to display information in a Flex application. ) One simpler control that you can use is the Flex Label control. This display-only text control writes text to the screen. You can create a Flex Label control by using the MXML tag. The contents of the Label control (the text that it chooses to display) is set in the text attribute to a value that is a String object.
Additionally, you can use the panels flanking the design stage to drag new Flex components to add to the design and to edit existing components. Whenever anything is done in Design mode that changes the state of the application (for example, dragging out a new component or changing a component property), the corresponding code is added or modified in Source mode. Everything done in Design mode results in generating or modifying the correct code in Source mode. Similarly, every change you make in Source mode gets represented in Design mode.
These types of errors would crop up eventually, but only at runtime when you’re debugging your application. Compile-time type checking forces you to write clear, structured code that’s less prone to errors. Understanding the Relationship between ActionScript and MXML Every MXML tag is actually ActionScript code behind the scenes. Each of the components in the Flex framework is written in ActionScript. When you compile a Flex application, the compiler translates all the MXML code into pure ActionScript code, which is the code that is then compiled and run.
Adobe Flex 3.0 For Dummies (For Dummies (Computer Tech)) by Doug McCune, Deepa Subramaniam