camerauis/cameraxui/cxui/src/cxuidisplaypropertyhandler.cpp
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/*
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* Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include "cxutils.h"
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#include "cxuidisplaypropertyhandler.h"
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namespace {
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    // Refresh period for the timer keeping backlight on.
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    const int CXUI_BACKLIGHT_REFRESH_TIMEOUT = 3000;
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}
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CxuiDisplayPropertyHandler::CxuiDisplayPropertyHandler() :
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    mBacklightTimer(this),
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    mUtility(this)
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{
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    // Setup backlight timer
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    mBacklightTimer.setSingleShot(false);
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    mBacklightTimer.setInterval(CXUI_BACKLIGHT_REFRESH_TIMEOUT);
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    QObject::connect(&mBacklightTimer,
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                     SIGNAL(timeout()),
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                     this,
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                     SLOT(simulateActivity()));
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}
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CxuiDisplayPropertyHandler::~CxuiDisplayPropertyHandler()
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{
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    mBacklightTimer.stop();
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}
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/**
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* Utility to keep backlight on and screensaver out.
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* @param enabled True means backlight is kept on and screensaver is disabled.
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*                False means backlight may time out and screensaver may come
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*                on depending of user activity.
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*/
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void CxuiDisplayPropertyHandler::setDisplayAlwaysVisible(bool enabled)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    if (enabled) {
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        CX_DEBUG( ("CxuiDisplayPropertyHandler - setting display constantly on") );
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        simulateActivity();
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        mBacklightTimer.start();
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    } else {
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        CX_DEBUG( ("CxuiDisplayPropertyHandler - setting display to normal mode") );
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        mBacklightTimer.stop();
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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}
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void CxuiDisplayPropertyHandler::simulateActivity()
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{
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    mUtility.resetInactivityTime();
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}
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/*!
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 * Handles viewfinder state changes.
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 * @param newState new viewfinder state
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 * @param error error code in case of error
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 */
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void CxuiDisplayPropertyHandler::handleVfStateChanged(
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    CxeViewfinderControl::State newState, CxeError::Id error)
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{
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    CX_DEBUG_ENTER_FUNCTION();
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    Q_UNUSED(error);
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    if (newState == CxeViewfinderControl::Running) {
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        // switch off screen saver and turn on backlight
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         setDisplayAlwaysVisible(true);
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    } else {
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        // switch on screen saver and turn off backlight
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        setDisplayAlwaysVisible(false);
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    }
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    CX_DEBUG_EXIT_FUNCTION();
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}