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

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Styles and Skinning

Using units

Flex no longer supports using the plus (+) and minus (-) unit modifiers.

Flex no longer supports the em and ex unit types.

Using skinning

Previously, you defined graphical skins as symbols in a FLA file, exported the FLA file as a 
SWC file from the Flash IDE, and added it to your Flex source path. The symbols in the new 
SWC file replaced existing symbols in Flex component skins.

Now, all skins are specified as style properties that can be set through CSS or inline. Do not 
use the symbol substitution method of defining new skins. 

To use a programmatic skin, add the class to your ActionScript source path when you 
compile. Then use the 

ClassReference()

 statement to reference that class in your 

application’s CSS. For example, if you have MySkins/MyButtonSkin.as, you use the following 
syntax to reference the class:

Button {

upSkin: ClassReference("MySkins.MyButtonSkin");

}

You use the 

Embed()

 statement to reference graphic skins in CSS. 

Many style properties that referred to skins are now deprecated. For example, the 

brokenImage

 property is obsolete and was replaced by the 

brokenImageSkin

 style property. 

This style property is of type Class. Flex throws an error if you try to apply a style to a 
property that no longer exists. For a list of available skin style properties, see the control’s 
entry in the Adobe Flex 2 Language Reference.

The drawing methods such as 

moveTo()

 that you would use in programmatic skinning are 

now accessed through the 

graphics

 property of the MovieClip object. To use them you must 

import the flash.display.* package.