Engine

Game state data providers: Provides state and static data about a particular instance of a data source, such as a player, weapon, pickup, or game objective. Data providers can generally not be referenced directly by the UI. Instead, they are normally accessed through a game state data store, such as the game state data store associated with the owning player, or the current game info instance. Game state data stores: Acts as the first layer between the game and the UI. Each data store contains a collection of game state data providers, which provide the data for instances of a game object Copyright 1998-2008 Epic Games, Inc. All Rights Reserved.  

When a style is created, it is assigned a persistent STYLE_ID. All styles for a particular widget are stored in a single unreal package file. The root object for this package is a UISkin object. The resources required by the style may also be stored in the skin file, or they might be located in another package.

A game UI is required to have at least one UISkin package that will serve as the default skin. Only one UISkin can be active at a time, and all custom UISkins are based on the default UISkin. Custom UISkins may decide to override a style completely by creating a new style that has the same STYLE_ID as the skin to be replaced, and placing that skin into the StyleLookupTable under that STYLE_ID. Any styles which aren't specifically overridden in the custom UISkin are inherited from the default skin. By default, widgets will automatically be mapped to the customized version of the UIStyle contained in the custom UISkin, but the user may choose to assign a completely different style to a particular widget. This only changes the style of that widget for that skin set and any UISkin that is based on the custom UISkin. Custom UISkins can be hierarchical, in that custom UISkins can be based on other custom UISkins. Copyright 1998-2008 Epic Games, Inc. All Rights Reserved.