MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guida Utente Scaricare il pdf (Pagina 97)

Creating ActionScript components 97

Creating ActionScript components

You create reusable components using ActionScript, and reference these components in your

Flex applications as MXML tags. Components created in ActionScript can contain graphical

elements, define custom business logic, or extend existing Flex components. They can inherit

from any components available in Flex.

Defining your own components in ActionScript has several benefits. Components let you

divide your applications into individual modules that you can develop and maintain

separately. By implementing commonly used logic within custom components, you can build

a suite of reusable components that you can share among multiple Flex applications.

In addition, you can base your custom components on the set of Flex components by

extending from the Flex class hierarchy. You can create custom versions of Flex visual controls,

as well as custom versions on nonvisual components, such as data validators, formatters, and

effects.

For example, you can define a custom button, derived from the Flex Button control, as the

following example shows:

// using_actionscript/myControls/MyButton.as

package myControls {

import mx.controls.Button;

public class MyButton extends Button {

public function MyButton() {

}

In this example, you write your MyButton control to the MyButton.as file, and you store the

file in the myControls subdirectory of the root directory of your Flex application. The

package name of your component reflects its location. In this example, the component’s

package name is

myControls.

You can reference your custom Button control from a Flex application file, such as

MyApp.mxml, as the following example shows:

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

xmlns:cmp="myControls.*">

<cmp:MyButton label="Click Me"/>

</mx:Application>

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 255 256

Nessun commento

MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Guida Utente Pagina 97