src/hbcore/feedback/hbfeedbackmanager.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 19 Apr 2010 14:02:13 +0300
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/****************************************************************************
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**
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (developer.feedback@nokia.com)
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**
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** This file is part of the HbCore module of the UI Extensions for Mobile.
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**
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this file.
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** Please review the following information to ensure the GNU Lesser General
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** Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at developer.feedback@nokia.com.
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**
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****************************************************************************/
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// internal
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#include "hbfeedbackmanager.h"
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#include "hbfeedbackplugingroup.h"
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#include "hbfeedbackengine.h"
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#include "hbinstantinteractionevent_p.h"
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#include "hbcontinuousinteractionevent_p.h"
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#include "hbwidget.h"
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// Qt related
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#include <QtDebug>
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#include <QList>
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#include <QCoreApplication>
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static int instantRunningIndex;
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static int continuousRunningIndex;
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/*!
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    @beta
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    @hbcore
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    \class HbFeedbackManager
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    \brief Feedback manager forwards interaction information from the widgets to feedback engine plugins.
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    Feedback engine plugins decide what kind of feedback effects will be played. Widgets don't use 
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    HbFeedbackManager directly but through HbWidgetFeedback convenience class.
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*/
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Q_GLOBAL_STATIC(HbFeedbackManager, feedbackManagerGlobal);
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class HbFeedbackManagerPrivate : public QObject
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{
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public:
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    HbFeedbackManagerPrivate();
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    ~HbFeedbackManagerPrivate();
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public:
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    HbFeedbackPluginGroup* pluginGroup;
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    QList <HbFeedbackEngine*> engines;
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};
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HbFeedbackManagerPrivate::HbFeedbackManagerPrivate()
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{
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}
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HbFeedbackManagerPrivate::~HbFeedbackManagerPrivate()
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{
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    delete pluginGroup;
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    engines.clear();
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}
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void removePlugins() {
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    HbFeedbackManager* manager = HbFeedbackManager::instance();
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    if (manager) {
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        manager->plugins().removePlugins();
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    }
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}
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/*!
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    Constructor.
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*/
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HbFeedbackManager::HbFeedbackManager(QObject *parent) : QObject(parent),
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        d(new HbFeedbackManagerPrivate)
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{
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    d->pluginGroup = new HbFeedbackPluginGroup(*this);
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    d->pluginGroup->loadPlugins();
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    instantRunningIndex = Hb::InstantUser;
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    continuousRunningIndex = Hb::ContinuousUser;
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    // delete the plugins before the application and widgets are destroyed
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    qAddPostRoutine(removePlugins);
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}
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/*!
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    Destructor.
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*/
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HbFeedbackManager::~HbFeedbackManager()
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{
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    delete d;
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}
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/*!
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    Returns feedback manager singleton object responsible for initiating feedback effects.
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    \return HbFeedbackManager returns feedback manager singleton object
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*/
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HbFeedbackManager* HbFeedbackManager::instance()
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{
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    return feedbackManagerGlobal();
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}
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/*!
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    Mediates interaction triggers from widgets to all active feedback engine plugins.
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   118
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    \param widget the widget being interacted with
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    \param interaction the interaction
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    \param modifiers extra specifiers to the interaction
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*/
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void HbFeedbackManager::triggered(const HbWidget *widget, Hb::InstantInteraction interaction, Hb::InteractionModifiers modifiers)
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{
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    if (widget) {
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        if (!widget->testAttribute(Hb::InteractionDisabled)) {
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            HbInstantInteractionEvent event(widget, interaction, modifiers);
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            foreach (HbFeedbackEngine* engine, d->engines) {
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                QCoreApplication::sendEvent(engine, &event);
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            }
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        }
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    } else {
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        qWarning("HbFeedbackManager::triggered: Attempt to report an interaction trigger with null widget pointer");
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    }
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}
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   136
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/*!
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    Mediates continuous interaction triggers to all active feedback plugins.
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    \param widget the widget being interacted with
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    \param interaction the continuous interaction in progress
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    \param delta the direction and distance of the continuous interaction
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*/
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void HbFeedbackManager::continuousTriggered(const HbWidget *widget, Hb::ContinuousInteraction interaction, QPointF delta)
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{
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    if (widget) {
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        if (!widget->testAttribute(Hb::InteractionDisabled)) {
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            HbContinuousInteractionEvent event(HbContinuousInteractionEvent::ContinuousInteraction, widget, interaction, delta);
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            foreach (HbFeedbackEngine* engine, d->engines) {
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                QCoreApplication::sendEvent(engine, &event);
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            }
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        }
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    } else {
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        qWarning("HbFeedbackManager::continuousTriggered: Attempt to stop a continuous interaction trigger with null widget pointer");
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    }
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}
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   157
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/*!
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    Mediates a "continuous interaction stop" triggers to all active feedback engine plugins.
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    This methods is needed for knowing when to stop continuous feedback effects started by 
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    the continuous interaction.
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    \param widget the widget being interacted with
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    \param interaction the continuous interaction in progress
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*/
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void HbFeedbackManager::continuousStopped(const HbWidget *widget, Hb::ContinuousInteraction interaction)
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{
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    if (widget) {
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        if (!widget->testAttribute(Hb::InteractionDisabled)) {
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            HbContinuousInteractionEvent event(HbContinuousInteractionEvent::ContinuousInteractionStop, widget, interaction);
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            foreach (HbFeedbackEngine* engine, d->engines) {
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                QCoreApplication::sendEvent(engine, &event);
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            }
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        }
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    } else {
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        qWarning("HbFeedbackManager::continuousStopped: Attempt to stop a c trigger with \
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                  null widget pointer");
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    }
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}
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   180
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/*!
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    Registers and returns a unique value (between Hb::InstantUser and Hb::InstantMaxUser) for custom 
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    interactions that cannot be covered with standard ones defined in namepace Hb. Returns -1 if all
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    custom interactions have been reserved.
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*/
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int HbFeedbackManager::registerInstantInteraction()
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{
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    if (instantRunningIndex < Hb::InstantMaxUser) {
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        instantRunningIndex++;
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        return instantRunningIndex;
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    } 
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    else {
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        return -1;
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    }
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}
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   196
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/*!
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    Registers and returns an unique value (between Hb::ContinuousUser and Hb::ContinuousMaxUser) for custom 
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    continuous interactions that cannot be covered with standard ones defined in namepace Hb. Returns -1 if 
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    all custom interactions have been reserved.
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*/
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int HbFeedbackManager::registerContinuousInteraction()
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{
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    if (continuousRunningIndex < Hb::ContinuousMaxUser) {
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        continuousRunningIndex++;
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        return continuousRunningIndex;
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    } 
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    else {
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        return -1;
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    }
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}
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   212
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/*!
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    Adds or removes HbFeedbackEngine from the list of feedback engines that receive
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    interaction events from the feedback manager.
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   216
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    \param engine the feedback engine to be added or removed
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    \param enabled the flag indicating whether the feedback engine is to be added or removed
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*/
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   220
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void HbFeedbackManager::setReceivesInteractions(HbFeedbackEngine* engine, bool enabled)
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{
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    if (engine) {
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        if (enabled) {
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            if (!d->engines.contains(engine)) {
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                d->engines.append(engine);
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            }
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        } else {
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            int index = d->engines.indexOf(engine);
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            if (index != -1) {
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                d->engines.removeAt(index);
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            }
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        }
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    } else {
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        if (enabled) {
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            qWarning("HbFeedbackManager::setReceivesInteractions: Attempt to register engine by passing a null pointer");
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        } else {
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            qWarning("HbFeedbackManager::setReceivesInteractions: Attempt to unregister engine using a null pointer");
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        }
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    }
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}
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/*!
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    Returns true if HbFeedbackEngine has already been registered to the manager.
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    \param engine the feedback engine
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*/
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bool HbFeedbackManager::receivesInteractions(HbFeedbackEngine* engine)
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{
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    bool contains(false);
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    if (engine) {
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        if (d->engines.contains(engine)) {
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            contains = true;
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        }
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    }
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    return contains;
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}
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/*!
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    Returns the group of feedback engine plugins.
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    \sa HbFeedbackPluginGroup
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*/
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HbFeedbackPluginGroup& HbFeedbackManager::plugins()
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{
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    return *d->pluginGroup;
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}
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