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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-1BB546C1-2795-55D9-97B6-AC3F6AB79389" xml:lang="en"><title>Controls</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>In the Symbian platform UI Control Framework, all UI elements (with a few

exceptions) are <keyword>controls</keyword>. 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. </p>

<p>All controls are implemented by deriving from the <codeph>CCoeControl</codeph> 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. </p>

</conbody></concept>