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Diffstat (limited to 'src/gui/kernel/qgesturemanager.cpp')
| -rw-r--r-- | src/gui/kernel/qgesturemanager.cpp | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/src/gui/kernel/qgesturemanager.cpp b/src/gui/kernel/qgesturemanager.cpp new file mode 100644 index 0000000..c244a0b --- /dev/null +++ b/src/gui/kernel/qgesturemanager.cpp @@ -0,0 +1,405 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the $MODULE$ of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qgesturemanager_p.h" +#include "qgesture.h" +#include "qevent.h" + +#include "qapplication.h" +#include "private/qapplication_p.h" + +#include "private/qgesturestandardrecognizers_p.h" + +#include "qdebug.h" + +// #define GESTURE_DEBUG +#ifndef GESTURE_DEBUG +# define DEBUG if (0) qDebug +#else +# define DEBUG qDebug +#endif + +QT_BEGIN_NAMESPACE + +bool qt_sendSpontaneousEvent(QObject *receiver, QEvent *event); +static bool qt_sendGestureEvent(QWidget *receiver, QGestureEvent *event) +{ + QSet<Qt::GestureType> eventGestures = event->gestureTypes().toSet(); + while (receiver && (receiver->gestures() & eventGestures).isEmpty()) + receiver = receiver->parentWidget(); + return receiver ? qt_sendSpontaneousEvent(receiver, event) : false; +} + +static const unsigned int maximumGestureRecognitionTimeout = 2000; + +QGestureManager::QGestureManager() + : targetWidget(0), state(NotGesture) +{ + recognizers << new QDoubleTapGestureRecognizer(); + recognizers << new QLongTapGestureRecognizer(); + recognizers << new QGestureRecognizerPan(); + // recognizers << new QMultiTouchGestureRecognizer(); + + foreach(QGestureRecognizer *r, recognizers) + connect(r, SIGNAL(triggered(QGestureRecognizer::Result)), + this, SLOT(recognizerTriggered(QGestureRecognizer::Result))); +} + +bool QGestureManager::filterEvent(QEvent *event) +{ + if (!QApplication::testAttribute(Qt::AA_EnableGestures)) + return false; + + QList<QEvent*> events; + events << event; + + QPoint currentPos; + switch (event->type()) { + case QEvent::MouseButtonPress: + case QEvent::MouseButtonRelease: + case QEvent::MouseButtonDblClick: + case QEvent::MouseMove: + currentPos = static_cast<QMouseEvent*>(event)->pos(); break; + default: break; + } + + const QMap<Qt::GestureType, int> &grabbedGestures = qApp->d_func()->grabbedGestures; + + bool ret = false; + QSet<QGestureRecognizer*> startedGestures; + QSet<QGestureRecognizer*> finishedGestures; + QSet<QGestureRecognizer*> newMaybeGestures; + QSet<QGestureRecognizer*> cancelledGestures; + QSet<QGestureRecognizer*> notGestures; + if (state == NotGesture || state == MaybeGesture) { + DEBUG() << "QGestureManager: current event processing state: " + << (state == NotGesture ? "NotGesture" : "MaybeGesture"); + + Q_ASSERT(targetWidget != 0); + QSet<QGestureRecognizer*> stillMaybeGestures; + // try other recognizers. + foreach(QGestureRecognizer *r, recognizers) { + if (grabbedGestures.value(r->gestureType(), 0) <= 0) + continue; + QGestureRecognizer::Result result = r->recognize(events); + if (result == QGestureRecognizer::GestureStarted) { + DEBUG() << "QGestureManager: gesture started: " << r; + startedGestures << r; + } else if (result == QGestureRecognizer::GestureFinished) { + DEBUG() << "QGestureManager: gesture finished: " << r; + finishedGestures << r; + } else if (result == QGestureRecognizer::MaybeGesture) { + DEBUG() << "QGestureManager: maybe gesture: " << r; + newMaybeGestures << r; + } else { + // if it was maybe gesture, but isn't a gesture anymore. + DEBUG() << "QGestureManager: not gesture: " << r; + notGestures << r; + } + } + activeGestures -= newMaybeGestures; + activeGestures += startedGestures; + foreach(QGestureRecognizer *r, startedGestures+notGestures) { + QMap<QGestureRecognizer*, int>::iterator it = maybeGestures.find(r); + if (it != maybeGestures.end()) { + killTimer(it.value()); + maybeGestures.erase(it); + } + } + foreach(QGestureRecognizer *r, newMaybeGestures) { + if (!maybeGestures.contains(r)) { + int timerId = startTimer(maximumGestureRecognitionTimeout); + if (!timerId) + qWarning("QGestureManager: couldn't start timer!"); + maybeGestures.insert(r, timerId); + } + } + if (!finishedGestures.isEmpty() || !activeGestures.isEmpty()) { + // gesture found! + ret = true; + DEBUG() << "QGestureManager: sending gesture event for: " + << activeGestures << " and " << finishedGestures; + + QList<QGesture*> gestures; + foreach(QGestureRecognizer *r, finishedGestures) { + if (QGesture *gesture = r->makeEvent()) + gestures << gesture; + } + foreach(QGestureRecognizer *r, activeGestures) { + if (QGesture *gesture = r->makeEvent()) + gestures << gesture; + } + Q_ASSERT(!gestures.isEmpty()); + QGestureEvent event(targetWidget, gestures); + qt_sendGestureEvent(targetWidget, &event); + + if (!activeGestures.isEmpty()) { + DEBUG() << "QGestureManager: new state = Gesture"; + state = Gesture; + } else if (!maybeGestures.isEmpty()) { + DEBUG() << "QGestureManager: new state = Maybe"; + state = MaybeGesture; + } else { + DEBUG() << "QGestureManager: new state = NotGesture"; + state = NotGesture; + } + } else if (!maybeGestures.isEmpty()) { + if (state != MaybeGesture) { + // We got a new set of events that look like a start + // of some gesture, so we switch to state MaybeGesture + // and wait for more events. + DEBUG() << "QGestureManager: new state = Maybe. Waiting for events"; + state = MaybeGesture; + // start gesture timer + } else { + // we still not sure if it is a gesture or not. + } + } else if (state == MaybeGesture) { + // last time we thought it looks like gesture, but now we + // know for sure that it isn't. + DEBUG() << "QGestureManager: new state = NotGesture"; + state = NotGesture; + } + foreach(QGestureRecognizer *r, finishedGestures) + r->reset(); + foreach(QGestureRecognizer *r, cancelledGestures) + r->reset(); + foreach(QGestureRecognizer *r, notGestures) + r->reset(); + } else if (state == Gesture) { + DEBUG() << "QGestureManager: current event processing state: Gesture"; + Q_ASSERT(!activeGestures.isEmpty()); + + foreach(QGestureRecognizer *r, recognizers) { + if (grabbedGestures.value(r->gestureType(), 0) <= 0) + continue; + QGestureRecognizer::Result result = r->recognize(events); + if (result == QGestureRecognizer::GestureStarted) { + DEBUG() << "QGestureManager: gesture started: " << r; + startedGestures << r; + } else if (result == QGestureRecognizer::GestureFinished) { + DEBUG() << "QGestureManager: gesture finished: " << r; + finishedGestures << r; + } else if (result == QGestureRecognizer::MaybeGesture) { + DEBUG() << "QGestureManager: maybe gesture: " << r; + newMaybeGestures << r; + } else { + // if it was an active gesture, but isn't a gesture anymore. + if (activeGestures.contains(r)) { + DEBUG() << "QGestureManager: cancelled gesture: " << r; + cancelledGestures << r; + } else { + DEBUG() << "QGestureManager: not gesture: " << r; + notGestures << r; + } + } + } + + activeGestures -= newMaybeGestures; + activeGestures -= cancelledGestures; + activeGestures -= finishedGestures; + activeGestures += startedGestures; + foreach(QGestureRecognizer *r, startedGestures+finishedGestures+notGestures) { + QMap<QGestureRecognizer*, int>::iterator it = maybeGestures.find(r); + if (it != maybeGestures.end()) { + killTimer(it.value()); + maybeGestures.erase(it); + } + } + foreach(QGestureRecognizer *r, newMaybeGestures) { + if (!maybeGestures.contains(r)) { + int timerId = startTimer(maximumGestureRecognitionTimeout); + if (!timerId) + qWarning("QGestureManager: couldn't start timer!"); + maybeGestures.insert(r, timerId); + } + } + QList<QGesture*> gestures; + if (!finishedGestures.isEmpty() || !activeGestures.isEmpty()) { + // another gesture found! + ret = true; + DEBUG() << "QGestureManager: sending gesture event for: " + << activeGestures << " and " << finishedGestures; + + foreach(QGestureRecognizer *r, finishedGestures) { + if (QGesture *gesture = r->makeEvent()) + gestures << gesture; + } + foreach(QGestureRecognizer *r, activeGestures) { + if (QGesture *gesture = r->makeEvent()) + gestures << gesture; + } + } + QSet<Qt::GestureType> cancelledGestureNames; + foreach(QGestureRecognizer *r, cancelledGestures) + cancelledGestureNames << r->gestureType(); + if(!gestures.isEmpty()) { + QGestureEvent event(targetWidget, gestures, cancelledGestureNames); + qt_sendGestureEvent(targetWidget, &event); + } + + foreach(QGestureRecognizer *r, finishedGestures) + r->reset(); + foreach(QGestureRecognizer *r, cancelledGestures) + r->reset(); + foreach(QGestureRecognizer *r, notGestures) + r->reset(); + if (!activeGestures.isEmpty()) { + // nothing changed, we are still handling a gesture + } else if (!maybeGestures.isEmpty()) { + DEBUG() << "QGestureManager: new state = Maybe. Waiting for events: " << maybeGestures; + state = MaybeGesture; + } else { + DEBUG() << "QGestureManager: new state = NotGesture"; + state = NotGesture; + } + ret = true; + } + + lastPos = currentPos; + return ret; +} + +void QGestureManager::timerEvent(QTimerEvent *event) +{ + // sanity checks, remove later + Q_ASSERT((state == Gesture && !activeGestures.isEmpty()) || (state != Gesture && activeGestures.isEmpty())); + + typedef QMap<QGestureRecognizer*, int> MaybeGestureMap; + for (MaybeGestureMap::iterator it = maybeGestures.begin(), e = maybeGestures.end(); + it != e; ++it) { + if (it.value() == event->timerId()) { + DEBUG() << "QGestureManager: gesture timeout."; + QGestureRecognizer *r = it.key(); + r->reset(); + maybeGestures.erase(it); + killTimer(event->timerId()); + break; + } + } + + if (state == MaybeGesture && maybeGestures.isEmpty()) { + DEBUG() << "QGestureManager: new state = NotGesture because of timeout"; + state = NotGesture; + } +} + +bool QGestureManager::inGestureMode() +{ + return state == Gesture; +} + +void QGestureManager::setGestureTargetWidget(QWidget *widget) +{ + targetWidget = widget; +} + +void QGestureManager::recognizerTriggered(QGestureRecognizer::Result result) +{ + if (!QApplication::testAttribute(Qt::AA_EnableGestures)) + return; + + QGestureRecognizer *recognizer = qobject_cast<QGestureRecognizer*>(sender()); + if (!recognizer) + return; + if (qApp->d_func()->grabbedGestures.value(recognizer->gestureType(), 0) <= 0) { + recognizer->reset(); + return; + } + + switch (result) { + case QGestureRecognizer::GestureStarted: + case QGestureRecognizer::GestureFinished: { + if (result == QGestureRecognizer::GestureStarted) { + DEBUG() << "QGestureManager: gesture started: " << recognizer; + activeGestures << recognizer; + DEBUG() << "QGestureManager: new state = Gesture"; + state = Gesture; + } else { + DEBUG() << "QGestureManager: gesture finished: " << recognizer; + } + if (maybeGestures.contains(recognizer)) { + killTimer(maybeGestures.value(recognizer)); + maybeGestures.remove(recognizer); + } + QList<QGesture*> gestures; + if (QGesture *gesture = recognizer->makeEvent()) + gestures << gesture; + if(!gestures.isEmpty()) { + QGestureEvent event(targetWidget, gestures); + qt_sendGestureEvent(targetWidget, &event); + } + if (result == QGestureRecognizer::GestureFinished) + recognizer->reset(); + } + break; + case QGestureRecognizer::MaybeGesture: { + DEBUG() << "QGestureManager: maybe gesture: " << recognizer; + if (activeGestures.contains(recognizer)) { + QGestureEvent event(targetWidget, QList<QGesture*>(), + QSet<Qt::GestureType>() << recognizer->gestureType()); + qt_sendGestureEvent(targetWidget, &event); + } + if (!maybeGestures.contains(recognizer)) { + int timerId = startTimer(maximumGestureRecognitionTimeout); + if (!timerId) + qWarning("QGestureManager: couldn't start timer!"); + maybeGestures.insert(recognizer, timerId); + } + } + break; + case QGestureRecognizer::NotGesture: + DEBUG() << "QGestureManager: not gesture: " << recognizer; + if (maybeGestures.contains(recognizer)) { + killTimer(maybeGestures.value(recognizer)); + maybeGestures.remove(recognizer); + } + recognizer->reset(); + break; + default: + Q_ASSERT(false); + } +} + +QT_END_NAMESPACE + +#include "moc_qgesturemanager_p.cpp" + |