Framework -requirements for GUI applications

diff -r 51a74ef9ed63 -r ae94777fff8f Symbian3/SDK/Source/GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita --- a/Symbian3/SDK/Source/GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita Wed Mar 31 11:11:55 2010 +0100 +++ b/Symbian3/SDK/Source/GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita Fri Jun 11 12:39:03 2010 +0100 @@ -1,72 +1,72 @@ - - - - - -Framework -requirements for GUI applications -

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.

-Logical dependencies in the MVC pattern -

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.
For more -information on these options, see Traditional -Symbian UI application architecture and View -architecture.

the controller :

handles application-wide events
commands the model, typically based on user input
-
selects the view to be displayed
is implemented either with a CAknAppUi-derived -class or a CAknViewAppUi derived class.
For -more information on these options, see Traditional -Symbian UI application architecture and View -architecture.
requires the implementation of CAknApplication and CAknDocument derived -classes.

The pattern is implemented with the following classes.

-Relationship between the classes that make up a typical Symbian application -

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

+ + + + + +Framework +requirements for GUI applications +

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.

+Logical dependencies in the MVC pattern +