MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador descarregar pdf (Página 174)

174 Migration Patterns

Instantiating Flex controls

In Flex 1.x, you created a Flex control in ActionScript by first including a reference to that

control, and then using the

createEmptyObject(), createChild(), createChildren(),

createChildAtDepth(), or createClassChildAtDepth() method.

These methods were removed. In Flex 2, you use the

new operator to create child controls and

attach the control to a container with the

addChild() or addChildAt() method. For

example:

Flex 1.x:

var b:Button;

b = Button(createChild(Button, undefined, { label: "OK" }));

Flex 2:

var b:Button = new Button();

b.label = "OK";

addChild(b);

Similarly, in Flex 2 you would destroy the object with the destroyObject(),

destroyChild(), destroyChildAt(), or destroyAllChildren() method. These methods

are also deprecated. Instead, you use the

removeChild() or removeChildAt() method.

The

createComponent() method now takes only a descriptor as its first argument, rather

than either a descriptor or a descriptor index. If you know the index, use

childDescriptors[i] to get the descriptor itself.

For more information on creating and destroying Flex controls in ActionScript, see the Flex 2

Developer’s Guide.

Flex 1.x Flex 2

createComponent() method

createComponentFromDescriptor()

createComponents()

method

createComponentsFromDescriptors()

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MACROMEDIA FLEX 2-MIGRATING APPLICATIONS TO FLEX 2 Manual do Utilizador Página 174