Detecting Focus Change

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Created: giridharn (24 May 2007)

Last edited: hamishwillee (30 May 2013)

The S60 framework will notify an application when it gains or loses the keyboard focus through a call to CAknAppUi::HandleForegroundEventL( TBool aForeground ) function. The aForeground parameter is true if the application has gained keyboard focus, false if it has lost it.

This function can be reimplemented whenever an application needs to react to focus change events. However, the base class should be called in order not to disrupt framework's event handling.

For example:

void CMyAppUi::HandleForegroundEventL( TBool aForeground )
   {
   // Call base class implementation
   CAknAppUi::HandleForegroundEventL( aForeground );
 
   if( aForeground )
     {
     // We have gained the focus
     ...
     }
   else
     {
     // We have lost the focus
     ...
     }
  }

See also

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