statevarobserver.cpp

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/**
* 
* @brief Definition of CStateVarObserver
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

// INCLUDE FILES

#include "StateVarObserver.h"

// User includes
#include "SystemAgentDialog.h"

CStateVarObserver* CStateVarObserver::NewL(TUid aUid, CSystemAgentDialog& aDialog)
    {
    CStateVarObserver* self = NewLC(aUid, aDialog);
    CleanupStack::Pop(self);
    return self;
    }
    
CStateVarObserver* CStateVarObserver::NewLC(TUid aUid, CSystemAgentDialog& aDialog)
    {
    CStateVarObserver* self = new (ELeave) CStateVarObserver(aUid, aDialog);
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

CStateVarObserver::CStateVarObserver(TUid aUid, CSystemAgentDialog& aDialog)
 :	CActive(EPriorityStandard), 
	iAppDialog(aDialog)
    {
	// Set the TRequestStatus for the event to use our iStatus
	iSysAgentEvent.SetRequestStatus(iStatus);

	// Set the iSysAgentEvent for monitoring the state variable with the requested UID
	iSysAgentEvent.SetUid(aUid); 
    }

CStateVarObserver::~CStateVarObserver()
    {
	// Make sure this active object is cancelled and close connection to the System Agent
	Cancel();
	iSysAgent.Close();
    }

void CStateVarObserver::ConstructL()
    {
	// Connect to the system agent
	User::LeaveIfError(iSysAgent.Connect());

	// Enable the event buffer to ensure no changes in the State Variable are missed,
	// the default expiry time is 10s
	iSysAgent.SetEventBufferEnabled(ETrue);

	// Add this active object to the active scheduler
	CActiveScheduler::Add(this);
    }

void CStateVarObserver::StartL()
	{
    iSysAgent.NotifyOnEvent(iSysAgentEvent);
    SetActive();
	}

void CStateVarObserver::RunL()
	{
	// Inform the dialog that it needs to update itself due to a change in state variable
	iAppDialog.ProcessStateVarChangeL(iSysAgentEvent.Uid(), iSysAgentEvent.State());
	StartL();
	}

void CStateVarObserver::DoCancel()
	{
	iSysAgent.NotifyEventCancel();
	}

/**
 * Gets the current value of the state variable and informs the dialog of it
 *
 * Demonstrates getting current values of state variables from the System Agent
 */
void CStateVarObserver::ProcessCurrentStateL()
	{
	TInt state = iSysAgent.GetState(iSysAgentEvent.Uid());
	iAppDialog.ProcessStateVarChangeL(iSysAgentEvent.Uid(), state);
	}