UI controller

The term UI controller refers to an object derived from either CAknAppUi or CAknViewAppUi , depending on your UI architecture. The UI controller is a required part of GUI-based applications.

Examples of services and responsibilities provided by the UI controller are as follows:

• control stack for event handling

• construction of views for applications

• the top-level window owning control of the application

For more information on the UI controller, see:

• The Application User Interface

• The run-time control hierarchy

The UI controller is part of the controller structure in the Model - View - Controller (MVC) design pattern used to design the architecture of many GUI-based mobile applications.

The CAknDocument -derived class of your application contains the first phase constructor of the UI controller.

The UI controller is implemented in one of the following classes:

• In a traditional architecture application architecture, the UI controller must be derived from CAknAppUi .

• In Symbian view architecture , the UI controller must be derived from CAknViewAppUi .

• In dialog architecture , the UI controller is typically derived from CAknAppUi .