/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "private/qgesturemanager_p.h"

#include "private/qstandardgestures_p.h"

#include "private/qwidget_p.h"

#include "private/qgesture_p.h"

#include "private/qgraphicsitem_p.h"

#include "private/qevent_p.h"

#include "private/qapplication_p.h"

#include "qgesture.h"

#include "qevent.h"

#include "qgraphicsitem.h"

#ifdef Q_WS_MAC

#include "qmacgesturerecognizer_mac_p.h"

#endif

#if defined(Q_OS_WIN) && !defined(QT_NO_NATIVE_GESTURES)

#include "qwinnativepangesturerecognizer_win_p.h"

#endif

#include "qdebug.h"

// #define GESTURE_DEBUG

#ifndef GESTURE_DEBUG

# define DEBUG if (0) qDebug

#else

# define DEBUG qDebug

#endif

#ifndef QT_NO_GESTURES

QT_BEGIN_NAMESPACE

QGestureManager::QGestureManager(QObject *parent)

    : QObject(parent), state(NotGesture), m_lastCustomGestureId(Qt::CustomGesture)

{

    qRegisterMetaType<Qt::GestureState>();

#if defined(Q_WS_MAC)

    registerGestureRecognizer(new QMacSwipeGestureRecognizer);

    registerGestureRecognizer(new QMacPinchGestureRecognizer);

  #if defined(QT_MAC_USE_COCOA)

    registerGestureRecognizer(new QMacPanGestureRecognizer);

  #endif

#else

    registerGestureRecognizer(new QPanGestureRecognizer);

    registerGestureRecognizer(new QPinchGestureRecognizer);

    registerGestureRecognizer(new QSwipeGestureRecognizer);

    registerGestureRecognizer(new QTapGestureRecognizer);

#endif

#if defined(Q_OS_WIN)

  #if !defined(QT_NO_NATIVE_GESTURES)

    if (QApplicationPrivate::HasTouchSupport)

        registerGestureRecognizer(new QWinNativePanGestureRecognizer);

  #endif

#else

    registerGestureRecognizer(new QTapAndHoldGestureRecognizer);

#endif

}

QGestureManager::~QGestureManager()

{

    qDeleteAll(m_recognizers.values());

    foreach (QGestureRecognizer *recognizer, m_obsoleteGestures.keys()) {

        qDeleteAll(m_obsoleteGestures.value(recognizer));

        delete recognizer;

    }

    m_obsoleteGestures.clear();

}

Qt::GestureType QGestureManager::registerGestureRecognizer(QGestureRecognizer *recognizer)

{

    QGesture *dummy = recognizer->create(0);

    if (!dummy) {

        qWarning("QGestureManager::registerGestureRecognizer: "

                 "the recognizer fails to create a gesture object, skipping registration.");

        return Qt::GestureType(0);

    }

    Qt::GestureType type = dummy->gestureType();

    if (type == Qt::CustomGesture) {

        // generate a new custom gesture id

        ++m_lastCustomGestureId;

        type = Qt::GestureType(m_lastCustomGestureId);

    }

    m_recognizers.insertMulti(type, recognizer);

    delete dummy;

    return type;

}

void QGestureManager::unregisterGestureRecognizer(Qt::GestureType type)

{

    QList<QGestureRecognizer *> list = m_recognizers.values(type);

    foreach (QGesture *g, m_gestureToRecognizer.keys()) {

        QGestureRecognizer *recognizer = m_gestureToRecognizer.value(g);

        if (list.contains(recognizer)) {

            m_deletedRecognizers.insert(g, recognizer);

        }

    }

    QMap<ObjectGesture, QList<QGesture *> >::const_iterator iter = m_objectGestures.begin();

    while (iter != m_objectGestures.end()) {

        ObjectGesture objectGesture = iter.key();

        if (objectGesture.gesture == type) {

            foreach (QGesture *g, iter.value()) {

                if (QGestureRecognizer *recognizer = m_gestureToRecognizer.value(g)) {

                    m_gestureToRecognizer.remove(g);

                    m_obsoleteGestures[recognizer].insert(g);

                }

            }

        }

        ++iter;

    }

}

void QGestureManager::cleanupCachedGestures(QObject *target, Qt::GestureType type)

{

    QMap<ObjectGesture, QList<QGesture *> >::Iterator iter = m_objectGestures.begin();

    while (iter != m_objectGestures.end()) {

        ObjectGesture objectGesture = iter.key();

        if (objectGesture.gesture == type && target == objectGesture.object.data()) {

            QSet<QGesture *> gestures = iter.value().toSet();

            for (QHash<QGestureRecognizer *, QSet<QGesture *> >::iterator

                 it = m_obsoleteGestures.begin(), e = m_obsoleteGestures.end(); it != e; ++it) {

                it.value() -= gestures;

            }

            foreach (QGesture *g, gestures) {

                m_deletedRecognizers.remove(g);

                m_gestureToRecognizer.remove(g);

            }

            qDeleteAll(gestures);

            iter = m_objectGestures.erase(iter);

        } else {

            ++iter;

        }

    }

}

// get or create a QGesture object that will represent the state for a given object, used by the recognizer

QGesture *QGestureManager::getState(QObject *object, QGestureRecognizer *recognizer, Qt::GestureType type)

{

    // if the widget is being deleted we should be carefull and not to

    // create a new state, as it will create QWeakPointer which doesnt work

    // from the destructor.

    if (object->isWidgetType()) {

        if (static_cast<QWidget *>(object)->d_func()->data.in_destructor)

            return 0;

    } else if (QGesture *g = qobject_cast<QGesture *>(object)) {

        return g;

#ifndef QT_NO_GRAPHICSVIEW

    } else {

        Q_ASSERT(qobject_cast<QGraphicsObject *>(object));

        QGraphicsObject *graphicsObject = static_cast<QGraphicsObject *>(object);

        if (graphicsObject->QGraphicsItem::d_func()->inDestructor)

            return 0;

#endif

    }

    // check if the QGesture for this recognizer has already been created

    foreach (QGesture *state, m_objectGestures.value(QGestureManager::ObjectGesture(object, type))) {

        if (m_gestureToRecognizer.value(state) == recognizer)

            return state;

    }

    Q_ASSERT(recognizer);

    QGesture *state = recognizer->create(object);

    if (!state)

        return 0;

    state->setParent(this);

    if (state->gestureType() == Qt::CustomGesture) {

        // if the recognizer didn't fill in the gesture type, then this

        // is a custom gesture with autogenerated id and we fill it.

        state->d_func()->gestureType = type;

#if defined(GESTURE_DEBUG)

        state->setObjectName(QString::number((int)type));

#endif

    }

    m_objectGestures[QGestureManager::ObjectGesture(object, type)].append(state);

    m_gestureToRecognizer[state] = recognizer;

    m_gestureOwners[state] = object;

    return state;

}

bool QGestureManager::filterEventThroughContexts(const QMultiMap<QObject *,

                                                 Qt::GestureType> &contexts,

                                                 QEvent *event)

{

    QSet<QGesture *> triggeredGestures;

    QSet<QGesture *> finishedGestures;

    QSet<QGesture *> newMaybeGestures;

    QSet<QGesture *> notGestures;

    // TODO: sort contexts by the gesture type and check if one of the contexts

    //       is already active.

    bool ret = false;

    // filter the event through recognizers

    typedef QMultiMap<QObject *, Qt::GestureType>::const_iterator ContextIterator;

    for (ContextIterator cit = contexts.begin(), ce = contexts.end(); cit != ce; ++cit) {

        Qt::GestureType gestureType = cit.value();

        QMap<Qt::GestureType, QGestureRecognizer *>::const_iterator

                rit = m_recognizers.lowerBound(gestureType),

                re = m_recognizers.upperBound(gestureType);

        for (; rit != re; ++rit) {

            QGestureRecognizer *recognizer = rit.value();

            QObject *target = cit.key();

            QGesture *state = getState(target, recognizer, gestureType);

            if (!state)

                continue;

            QGestureRecognizer::Result result = recognizer->recognize(state, target, event);

            QGestureRecognizer::Result type = result & QGestureRecognizer::ResultState_Mask;

            result &= QGestureRecognizer::ResultHint_Mask;

            if (type == QGestureRecognizer::TriggerGesture) {

                DEBUG() << "QGestureManager:Recognizer: gesture triggered: " << state;

                triggeredGestures << state;

            } else if (type == QGestureRecognizer::FinishGesture) {

                DEBUG() << "QGestureManager:Recognizer: gesture finished: " << state;

                finishedGestures << state;

            } else if (type == QGestureRecognizer::MayBeGesture) {

                DEBUG() << "QGestureManager:Recognizer: maybe gesture: " << state;

                newMaybeGestures << state;

            } else if (type == QGestureRecognizer::CancelGesture) {

                DEBUG() << "QGestureManager:Recognizer: not gesture: " << state;

                notGestures << state;

            } else if (type == QGestureRecognizer::Ignore) {

                DEBUG() << "QGestureManager:Recognizer: ignored the event: " << state;

            } else {

                DEBUG() << "QGestureManager:Recognizer: hm, lets assume the recognizer"

                        << "ignored the event: " << state;

            }

            if (result & QGestureRecognizer::ConsumeEventHint) {

                DEBUG() << "QGestureManager: we were asked to consume the event: "

                        << state;

                ret = true;

            }

        }

    }

    if (triggeredGestures.isEmpty() && finishedGestures.isEmpty()

        && newMaybeGestures.isEmpty() && notGestures.isEmpty())

        return ret;

    QSet<QGesture *> startedGestures = triggeredGestures - m_activeGestures;

    triggeredGestures &= m_activeGestures;

    // check if a running gesture switched back to maybe state

    QSet<QGesture *> activeToMaybeGestures = m_activeGestures & newMaybeGestures;

    // check if a maybe gesture switched to canceled - reset it but don't send an event

    QSet<QGesture *> maybeToCanceledGestures = m_maybeGestures & notGestures;

    // check if a running gesture switched back to not gesture state,

    // i.e. were canceled

    QSet<QGesture *> canceledGestures = m_activeGestures & notGestures;

    // new gestures in maybe state

    m_maybeGestures += newMaybeGestures;

    // gestures that were in maybe state

    QSet<QGesture *> notMaybeGestures = (startedGestures | triggeredGestures

                                         | finishedGestures | canceledGestures

                                         | notGestures);

    m_maybeGestures -= notMaybeGestures;

    Q_ASSERT((startedGestures & finishedGestures).isEmpty());

    Q_ASSERT((startedGestures & newMaybeGestures).isEmpty());

    Q_ASSERT((startedGestures & canceledGestures).isEmpty());

    Q_ASSERT((finishedGestures & newMaybeGestures).isEmpty());

    Q_ASSERT((finishedGestures & canceledGestures).isEmpty());

    Q_ASSERT((canceledGestures & newMaybeGestures).isEmpty());

    QSet<QGesture *> notStarted = finishedGestures - m_activeGestures;

    if (!notStarted.isEmpty()) {

        // there are some gestures that claim to be finished, but never started.

        // probably those are "singleshot" gestures so we'll fake the started state.

        foreach (QGesture *gesture, notStarted)

            gesture->d_func()->state = Qt::GestureStarted;

        QSet<QGesture *> undeliveredGestures;

        deliverEvents(notStarted, &undeliveredGestures);

        finishedGestures -= undeliveredGestures;

    }

    m_activeGestures += startedGestures;

    // sanity check: all triggered gestures should already be in active gestures list

    Q_ASSERT((m_activeGestures & triggeredGestures).size() == triggeredGestures.size());

    m_activeGestures -= finishedGestures;

    m_activeGestures -= activeToMaybeGestures;

    m_activeGestures -= canceledGestures;

    // set the proper gesture state on each gesture

    foreach (QGesture *gesture, startedGestures)

        gesture->d_func()->state = Qt::GestureStarted;

    foreach (QGesture *gesture, triggeredGestures)

        gesture->d_func()->state = Qt::GestureUpdated;

    foreach (QGesture *gesture, finishedGestures)

        gesture->d_func()->state = Qt::GestureFinished;

    foreach (QGesture *gesture, canceledGestures)

        gesture->d_func()->state = Qt::GestureCanceled;

    foreach (QGesture *gesture, activeToMaybeGestures)

        gesture->d_func()->state = Qt::GestureFinished;

    if (!m_activeGestures.isEmpty() || !m_maybeGestures.isEmpty() ||

        !startedGestures.isEmpty() || !triggeredGestures.isEmpty() ||

        !finishedGestures.isEmpty() || !canceledGestures.isEmpty()) {

        DEBUG() << "QGestureManager::filterEventThroughContexts:"

                << "\n\tactiveGestures:" << m_activeGestures

                << "\n\tmaybeGestures:" << m_maybeGestures

                << "\n\tstarted:" << startedGestures

                << "\n\ttriggered:" << triggeredGestures

                << "\n\tfinished:" << finishedGestures

                << "\n\tcanceled:" << canceledGestures

                << "\n\tmaybe-canceled:" << maybeToCanceledGestures;

    }

    QSet<QGesture *> undeliveredGestures;

    deliverEvents(startedGestures+triggeredGestures+finishedGestures+canceledGestures,

                  &undeliveredGestures);

    foreach (QGesture *g, startedGestures) {

        if (undeliveredGestures.contains(g))

            continue;

        if (g->gestureCancelPolicy() == QGesture::CancelAllInContext) {

            DEBUG() << "lets try to cancel some";

            // find gestures in context in Qt::GestureStarted or Qt::GestureUpdated state and cancel them

            cancelGesturesForChildren(g);

        }

    }

    m_activeGestures -= undeliveredGestures;

    // reset gestures that ended

    QSet<QGesture *> endedGestures =

            finishedGestures + canceledGestures + undeliveredGestures + maybeToCanceledGestures;

    foreach (QGesture *gesture, endedGestures) {

        recycle(gesture);

        m_gestureTargets.remove(gesture);

    }

    return ret;

}

// Cancel all gestures of children of the widget that original is associated with

void QGestureManager::cancelGesturesForChildren(QGesture *original)

{

    Q_ASSERT(original);

    QWidget *originatingWidget = m_gestureTargets.value(original);

    Q_ASSERT(originatingWidget);

    // iterate over all active gestures and all maybe gestures

    // for each find the owner

    // if the owner is part of our sub-hierarchy, cancel it.

    QSet<QGesture*> cancelledGestures;

    QSet<QGesture*>::Iterator iter = m_activeGestures.begin();

    while (iter != m_activeGestures.end()) {

        QWidget *widget = m_gestureTargets.value(*iter);

        // note that we don't touch the gestures for our originatingWidget

        if (widget != originatingWidget && originatingWidget->isAncestorOf(widget)) {

            DEBUG() << "  found a gesture to cancel" << (*iter);

            (*iter)->d_func()->state = Qt::GestureCanceled;

            cancelledGestures << *iter;

            iter = m_activeGestures.erase(iter);

        } else {

            ++iter;

        }

    }

    // TODO handle 'maybe' gestures too

    // sort them per target widget by cherry picking from almostCanceledGestures and delivering

    QSet<QGesture *> almostCanceledGestures = cancelledGestures;

    while (!almostCanceledGestures.isEmpty()) {

        QWidget *target = 0;

        QSet<QGesture*> gestures;

        iter = almostCanceledGestures.begin();

        // sort per target widget

        while (iter != almostCanceledGestures.end()) {

            QWidget *widget = m_gestureTargets.value(*iter);

            if (target == 0)

                target = widget;

            if (target == widget) {

                gestures << *iter;

                iter = almostCanceledGestures.erase(iter);

            } else {

                ++iter;

            }

        }

        Q_ASSERT(target);

        QSet<QGesture*> undeliveredGestures;

        deliverEvents(gestures, &undeliveredGestures);

    }

    for (iter = cancelledGestures.begin(); iter != cancelledGestures.end(); ++iter)

        recycle(*iter);

}

void QGestureManager::cleanupGesturesForRemovedRecognizer(QGesture *gesture)

{

    QGestureRecognizer *recognizer = m_deletedRecognizers.value(gesture);

    Q_ASSERT(recognizer);

    m_deletedRecognizers.remove(gesture);

    if (m_deletedRecognizers.keys(recognizer).isEmpty()) {

        // no more active gestures, cleanup!

        qDeleteAll(m_obsoleteGestures.value(recognizer));

        m_obsoleteGestures.remove(recognizer);

        delete recognizer;

    }

}

// return true if accepted (consumed)

bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)

{

    QMap<Qt::GestureType, int> types;

    QMultiMap<QObject *, Qt::GestureType> contexts;

    QWidget *w = receiver;

    typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator;

    if (!w->d_func()->gestureContext.isEmpty()) {

        for(ContextIterator it = w->d_func()->gestureContext.begin(),

            e = w->d_func()->gestureContext.end(); it != e; ++it) {

            types.insert(it.key(), 0);

            contexts.insertMulti(w, it.key());

        }

    }

    // find all gesture contexts for the widget tree

    w = w->isWindow() ? 0 : w->parentWidget();

    while (w)

    {

        for (ContextIterator it = w->d_func()->gestureContext.begin(),

             e = w->d_func()->gestureContext.end(); it != e; ++it) {

            if (!(it.value() & Qt::DontStartGestureOnChildren)) {

                if (!types.contains(it.key())) {

                    types.insert(it.key(), 0);

                    contexts.insertMulti(w, it.key());

                }

            }

        }

        if (w->isWindow())

            break;

        w = w->parentWidget();

    }

    return contexts.isEmpty() ? false : filterEventThroughContexts(contexts, event);

}

#ifndef QT_NO_GRAPHICSVIEW

bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event)

{

    QMap<Qt::GestureType, int> types;

    QMultiMap<QObject *, Qt::GestureType> contexts;

    QGraphicsObject *item = receiver;

    if (!item->QGraphicsItem::d_func()->gestureContext.isEmpty()) {

        typedef QMap<Qt::GestureType, Qt::GestureFlags>::const_iterator ContextIterator;

        for(ContextIterator it = item->QGraphicsItem::d_func()->gestureContext.begin(),

            e = item->QGraphicsItem::d_func()->gestureContext.end(); it != e; ++it) {

            types.insert(it.key(), 0);

            contexts.insertMulti(item, it.key());

        }

    }

    // find all gesture contexts for the graphics object tree