Controls

In the Symbian platform UI Control Framework, all UI elements (with a few exceptions) are controls . A control is a rectangular area of the screen that may respond to user input events. Buttons, menus, text input boxes and application views displaying application-specific data are all examples of controls.

All controls are implemented by deriving from the CCoeControl class. Concrete implementations of controls are provided by a user interface library, or by the application programmer. The control framework itself provides no concrete controls.

• Window-owning controls and non-window-owning controls
  
• Simple controls and compound controls
  
• The run-time control hierarchy
  
• The control environment
  
• Control observers
  
• Control contexts
  
• The object provider (MOP) mechanism
  
• Text and Zooming
  
• Layout management