Interface that provides context sensitive control over data allocation.
MAknsDataContext can be used to indicate need for specific skin items and thus to ensure that they are allocated before first use.
This is a public class with exported functions. The class is not usually intended for user derivation - concrete classes implementing the interface are provided by the library. See AknsUtils::CreateDataContextForContainerL() for further details.
Indicates that specified item will no longer be used.
Instructs the data context that the specified item will not be used by caller anymore. Exact behavior (e.g. whether cached instance is deallocated) depends on the cache policy of data context and skin instance. Controls should not usually call this method, but instead allow data context (in most cases implemented by a container) go out of scope.
Instructs the data context that the specified item will be used by caller and should be allocated and cached by skin instance. Any control using cached skin items should reserve them, preferably in ConstructL(), by calling this method. Note that reservation does not guarantee that the item will be available in cache - it's only a tentative request for allocation.
Parameters:
aID
Item ID of the item to be reserved.
Exceptions:
If item data allocation fails, function leaves with error code.
