Macromedia flex 2-migrating applications to flex 2 Manual De Usuario

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()