Getting notifications of focus change and launch of other apps using Symbian C++

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Article Metadata

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Compatibility

Platform(s): S60 3rd Edition

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Article

Created: User:Technical writer 1 (26 Sep 2007)

Last edited: ashraf fawzy (25 Jul 2012)

Description

Sometimes applications need to get notifications about the change of the application in focus or launching of another application.

Solution

The notifications can be enabled using the following code:

In the constructL of the AppUi, add the following lines:

//To get notifications about Focus change events
iCoeEnv->RootWin().EnableFocusChangeEvents();
//To get notifications about launching of other applications
iCoeEnv->RootWin().EnableGroupChangeEvents();

After these functions are called, the events are delivered to the window server every time the particular event occurs. The code to handle the notifications is as follows:

  void CMyAppUi::HandleWsEventL( const TWsEvent& aEvent,  
                                 CCoeControl* aDestination )
      {
      if(aEvent.Type() == EEventFocusGroupChanged)
          {
          //Focus change event
          //Handling to be done here
          }
      else if(aEvent.Type() ==  EEventWindowGroupsChanged)
          {
          //Group change event (launching of other applications)
          //Handling to be done here
          }
      CAknAppUi::HandleWsEventL(aEvent,aDestination);
      }