Flex 4 components/skins hierarchy and interaction - how does it work?

OK, so I watched and read tutorials how to make a component mxml with the States and how to manipulate with buttons and so on. Also, in addition to this you can write script to change the property of another component whose id is set for her. But I get really confused how things work situations. For now, I'll start with one of them:

(1) we have the main application

(2) we have defined a skin on it

(3) if I understand I can add States to her, also adjustable groups and other components with the ID in order to make changes to what the user views

(4) so the question is: if I put a button in the main application, how can I do click here to access the skin and target specific elements and apply changes to it.

I would appreciate if you set very simple examples on the situations that I will try to discuss it here because it's good to help others with these my reviews basic concepts that are required for structuring your Web site or the components correctly.

Waiting for help

Hello

Declare a meta SkinState tag in the class of the component allows the compiler to give you an error when you are creating a skin and setting it's HostComponent if States do not exist in MXML skin code.

It also allows the ASDoc documenting skin conditions in your documentation. I think another one is when you create a skin based on a HostComponent (in the new-> hide option), Flash Builder automatically adds the statement of MXML States for you.

The SkinPart is important for the Spark components. Declaring a SkinPart meta data on the component allows you to require parts, so if it is omitted on the skin, the compiler will complain. SkinnableComponent will also define a reference on itself when the skin is created and added. This means that you already get a Ref to the part of skin to your component is public without digging in the reference of the skin.

And finally, in your component you get partAdded() and partRemoved() notifications when you override these methods.

So overall, meta tags are important if you are trying to build a decent component.

Note:

this.skin.getChildByName("elementName")

The call is not recursive, it finds only the first level of the display of the skin list. If you had elementName in a group? You have the ID of the group as well. It is the purpose of SkinPart.

Mike

Tags: Flex

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