How to check if the backlight is off and how to turn it on

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Article Metadata

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Tested with

Devices(s): N78

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Compatibility

Platform(s): S60 3rd Edition (initial release), FP1, FP2

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Article

Keywords: keywords=HAL::Get(),User::ResetInactivityTime()

Created: lming (01 Nov 2008)

Last edited: hamishwillee (06 May 2013)

Overview

This snippet demonstrates how to check whether the screen backlight is off and how to turn it on. This snippet can be self-signed.

Use case

If the phone is inactive for a certain period, the backlight will turn off automatically to save battery power. In some cases, this operation could be disturbing, for example, during navigation.

Source file

//necessary library
LIBRARY	        HAL.LIB
LIBRARY		euser.lib

//necessary header file
#include <HAL.h>
#include <hal_data.h>
#include <e32std.h>
 
TBool backlightState;
//retrieve EBacklightState value
HAL::Get( HALData::EBacklightState, backlightState );    
if(backlightState)
   {
   //backlight is ON now.
   ....... 
   }
else
   {
   //backlight is Off now.
   //ResetInactivityTime will reset all user inactivity timers and backlight 
   //will be turn on
   User::ResetInactivityTime()
   }

Postconditions

Screen backlight will be turned on.