Applications developed for the Symbian platform can use a number of different architecture solutions to meet their requirements. One example of a common approach includes the Model - View - Controller (MVC) pattern used in GUI-based applications. In this approach, the application is split into three separate logical parts. Each part contains a different aspect of the entire application, and has a specific role.
In this approach, the model:
contains and manipulates the data in the application
is owned by the controller
is typically implemented in its own class or classes
the view :
displays the application state known by the model
receives user input
notifies the controller of relevant events
is implemented either with a CCoeControl derived class or a CAknView derived class.
the controller :
handles application-wide events
commands the model, typically based on user input
selects the view to be displayed
The pattern is implemented with the following classes.
The CAknApplication -derived class:
provides the application object expected by the application framework when the application is launched.
defines the application properties.
creates the CAknDocument derived class if it does not exist yet.
if an instance of the application is already running, switches to that instance and exits.
The CAknDocument -derived class:
creates the controller class
is the base class for application documents
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