MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador descarregar pdf (Página 162)

162 Customizing Components

Specifying the package

Define your custom components within an ActionScript package. The package reflects the

directory location of your component within the directory structure of your application.

package myComponents

{

// Class definition goes here.

}

Defining the class

The class definition must be prefixed by the public keyword, as the following example shows:

// Class definition goes here.

public class MyButton extends Button {

// Define properties, constructor, and methods.

}

Defining the constructor

If the class is missing a constructor, add it. A constructor for a child class of UIComponent

must have no required arguments; it can only have optional ones.

Here is a typical constructor:

public function Button() {

super();

className = "Button";

btnOffset = 0;

}

Creating bindable properties

In Flex 1.5, you use the [ChangeEvent] metadata tag to define a property as bindable. In Flex

2.0, you use the

[Bindable] metadata tag. For more information, see Creating and Extending

Flex 2 Components.

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MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador Página 162