From 70c1c87a3df52e510413c3e8512d9e55df00e7bd Mon Sep 17 00:00:00 2001 From: Denis Dzyubenko Date: Tue, 3 Nov 2009 11:56:11 +0100 Subject: Implemented QSwipeGesture recognizer using touch events. Reviewed-by: Bradley T. Hughes --- examples/gestures/imagegestures/imagewidget.cpp | 18 +-- src/gui/kernel/qgesture_p.h | 8 +- src/gui/kernel/qgesturemanager.cpp | 1 + src/gui/kernel/qstandardgestures.cpp | 153 +++++++++++++++++++++++- src/gui/kernel/qstandardgestures_p.h | 9 ++ 5 files changed, 176 insertions(+), 13 deletions(-) diff --git a/examples/gestures/imagegestures/imagewidget.cpp b/examples/gestures/imagegestures/imagewidget.cpp index df8f56d..96400c4 100644 --- a/examples/gestures/imagegestures/imagewidget.cpp +++ b/examples/gestures/imagegestures/imagewidget.cpp @@ -103,12 +103,12 @@ void ImageWidget::mouseDoubleClickEvent(QMouseEvent *) //! [gesture event handler] bool ImageWidget::gestureEvent(QGestureEvent *event) { - if (QGesture *pan = event->gesture(Qt::PanGesture)) + if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) + swipeTriggered(static_cast(swipe)); + else if (QGesture *pan = event->gesture(Qt::PanGesture)) panTriggered(static_cast(pan)); if (QGesture *pinch = event->gesture(Qt::PinchGesture)) pinchTriggered(static_cast(pinch)); - if (QGesture *swipe = event->gesture(Qt::SwipeGesture)) - swipeTriggered(static_cast(swipe)); return true; } //! [gesture event handler] @@ -154,12 +154,14 @@ void ImageWidget::pinchTriggered(QPinchGesture *gesture) //! [swipe function] void ImageWidget::swipeTriggered(QSwipeGesture *gesture) { - if (gesture->horizontalDirection() == QSwipeGesture::Left + if (gesture->state() == Qt::GestureFinished) { + if (gesture->horizontalDirection() == QSwipeGesture::Left || gesture->verticalDirection() == QSwipeGesture::Up) - goPrevImage(); - else - goNextImage(); - update(); + goPrevImage(); + else + goNextImage(); + update(); + } } //! [swipe function] diff --git a/src/gui/kernel/qgesture_p.h b/src/gui/kernel/qgesture_p.h index ae2e287..a571bdb 100644 --- a/src/gui/kernel/qgesture_p.h +++ b/src/gui/kernel/qgesture_p.h @@ -136,13 +136,19 @@ public: QSwipeGesturePrivate() : horizontalDirection(QSwipeGesture::NoDirection), verticalDirection(QSwipeGesture::NoDirection), - swipeAngle(0) + swipeAngle(0), + started(false), speed(0) { } QSwipeGesture::SwipeDirection horizontalDirection; QSwipeGesture::SwipeDirection verticalDirection; qreal swipeAngle; + + QPoint lastPositions[3]; + bool started; + qreal speed; + QTime time; }; QT_END_NAMESPACE diff --git a/src/gui/kernel/qgesturemanager.cpp b/src/gui/kernel/qgesturemanager.cpp index 628892d..662a64b 100644 --- a/src/gui/kernel/qgesturemanager.cpp +++ b/src/gui/kernel/qgesturemanager.cpp @@ -90,6 +90,7 @@ QGestureManager::QGestureManager(QObject *parent) #else registerGestureRecognizer(new QPanGestureRecognizer); registerGestureRecognizer(new QPinchGestureRecognizer); + registerGestureRecognizer(new QSwipeGestureRecognizer); #if defined(Q_OS_WIN) registerGestureRecognizer(new QWinNativePanGestureRecognizer); #endif diff --git a/src/gui/kernel/qstandardgestures.cpp b/src/gui/kernel/qstandardgestures.cpp index dfd49eb..79346ed 100644 --- a/src/gui/kernel/qstandardgestures.cpp +++ b/src/gui/kernel/qstandardgestures.cpp @@ -45,6 +45,7 @@ #include "qevent.h" #include "qwidget.h" #include "qabstractscrollarea.h" +#include "qdebug.h" QT_BEGIN_NAMESPACE @@ -66,7 +67,9 @@ QGesture *QPanGestureRecognizer::create(QObject *target) return new QPanGesture; } -QGestureRecognizer::Result QPanGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event) +QGestureRecognizer::Result QPanGestureRecognizer::recognize(QGesture *state, + QObject *, + QEvent *event) { QPanGesture *q = static_cast(state); QPanGesturePrivate *d = q->d_func(); @@ -155,7 +158,9 @@ QGesture *QPinchGestureRecognizer::create(QObject *target) return new QPinchGesture; } -QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event) +QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state, + QObject *, + QEvent *event) { QPinchGesture *q = static_cast(state); QPinchGesturePrivate *d = q->d_func(); @@ -199,8 +204,9 @@ QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state, Q d->centerPoint = centerPoint; d->changeFlags |= QPinchGesture::CenterPointChanged; - const qreal scaleFactor = QLineF(p1.pos(), p2.pos()).length() - / QLineF(d->startPosition[0], d->startPosition[1]).length(); + const qreal scaleFactor = + QLineF(p1.pos(), p2.pos()).length() + / QLineF(d->startPosition[0], d->startPosition[1]).length(); if (d->isNewSequence) { d->lastScaleFactor = scaleFactor; } else { @@ -256,4 +262,143 @@ void QPinchGestureRecognizer::reset(QGesture *state) QGestureRecognizer::reset(state); } +// +// QSwipeGestureRecognizer +// + +QSwipeGestureRecognizer::QSwipeGestureRecognizer() +{ +} + +QGesture *QSwipeGestureRecognizer::create(QObject *target) +{ + if (target && target->isWidgetType()) { + static_cast(target)->setAttribute(Qt::WA_AcceptTouchEvents); + } + return new QSwipeGesture; +} + +QGestureRecognizer::Result QSwipeGestureRecognizer::recognize(QGesture *state, + QObject *, + QEvent *event) +{ + QSwipeGesture *q = static_cast(state); + QSwipeGesturePrivate *d = q->d_func(); + + const QTouchEvent *ev = static_cast(event); + + QGestureRecognizer::Result result; + + switch (event->type()) { + case QEvent::TouchBegin: { + d->speed = 1; + d->time = QTime::currentTime(); + d->started = true; + result = QGestureRecognizer::MayBeGesture; + break; + } + case QEvent::TouchEnd: { + if (q->state() != Qt::NoGesture) { + result = QGestureRecognizer::FinishGesture; + } else { + result = QGestureRecognizer::CancelGesture; + } + break; + } + case QEvent::TouchUpdate: { + if (!d->started) + result = QGestureRecognizer::CancelGesture; + else if (ev->touchPoints().size() == 3) { + QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0); + QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1); + QTouchEvent::TouchPoint p3 = ev->touchPoints().at(2); + + if (d->lastPositions[0].isNull()) { + d->lastPositions[0] = p1.startScreenPos().toPoint(); + d->lastPositions[1] = p2.startScreenPos().toPoint(); + d->lastPositions[2] = p3.startScreenPos().toPoint(); + } + d->hotSpot = p1.screenPos(); + d->isHotSpotSet = true; + + int xDistance = (p1.screenPos().x() - d->lastPositions[0].x() + + p2.screenPos().x() - d->lastPositions[1].x() + + p3.screenPos().x() - d->lastPositions[2].x()) / 3; + int yDistance = (p1.screenPos().y() - d->lastPositions[0].y() + + p2.screenPos().y() - d->lastPositions[1].y() + + p3.screenPos().y() - d->lastPositions[2].y()) / 3; + + const int distance = xDistance >= yDistance ? xDistance : yDistance; + int elapsedTime = d->time.msecsTo(QTime::currentTime()); + if (!elapsedTime) + elapsedTime = 1; + d->speed = 0.9 * d->speed + distance / elapsedTime; + d->time = QTime::currentTime(); + d->swipeAngle = QLineF(p1.startScreenPos(), p1.screenPos()).angle(); + + static const int MoveThreshold = 50; + if (xDistance > MoveThreshold || yDistance > MoveThreshold) { + // measure the distance to check if the direction changed + d->lastPositions[0] = p1.screenPos().toPoint(); + d->lastPositions[1] = p2.screenPos().toPoint(); + d->lastPositions[2] = p3.screenPos().toPoint(); + QSwipeGesture::SwipeDirection horizontal = + xDistance > 0 ? QSwipeGesture::Right : QSwipeGesture::Left; + QSwipeGesture::SwipeDirection vertical = + yDistance > 0 ? QSwipeGesture::Down : QSwipeGesture::Up; + if (d->verticalDirection == QSwipeGesture::NoDirection) + d->verticalDirection = vertical; + if (d->horizontalDirection == QSwipeGesture::NoDirection) + d->horizontalDirection = horizontal; + if (d->verticalDirection != vertical || d->horizontalDirection != horizontal) { + // the user has changed the direction! + result = QGestureRecognizer::CancelGesture; + } + result = QGestureRecognizer::TriggerGesture; + } else { + if (q->state() != Qt::NoGesture) + result = QGestureRecognizer::TriggerGesture; + else + result = QGestureRecognizer::MayBeGesture; + } + } else if (ev->touchPoints().size() > 3) { + result = QGestureRecognizer::CancelGesture; + } else { // less than 3 touch points + if (d->started && (ev->touchPointStates() & Qt::TouchPointPressed)) + result = QGestureRecognizer::CancelGesture; + else if (d->started) + result = QGestureRecognizer::Ignore; + else + result = QGestureRecognizer::MayBeGesture; + } + break; + } + case QEvent::MouseButtonPress: + case QEvent::MouseMove: + case QEvent::MouseButtonRelease: + result = QGestureRecognizer::Ignore; + break; + default: + result = QGestureRecognizer::Ignore; + break; + } + return result; +} + +void QSwipeGestureRecognizer::reset(QGesture *state) +{ + QSwipeGesture *q = static_cast(state); + QSwipeGesturePrivate *d = q->d_func(); + + d->verticalDirection = d->horizontalDirection = QSwipeGesture::NoDirection; + d->swipeAngle = 0; + + d->lastPositions[0] = d->lastPositions[1] = d->lastPositions[2] = QPoint(); + d->started = false; + d->speed = 0; + d->time = QTime(); + + QGestureRecognizer::reset(state); +} + QT_END_NAMESPACE diff --git a/src/gui/kernel/qstandardgestures_p.h b/src/gui/kernel/qstandardgestures_p.h index e6f346c..90f995d 100644 --- a/src/gui/kernel/qstandardgestures_p.h +++ b/src/gui/kernel/qstandardgestures_p.h @@ -74,7 +74,16 @@ public: QPinchGestureRecognizer(); QGesture *create(QObject *target); + QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event); + void reset(QGesture *state); +}; +class QSwipeGestureRecognizer : public QGestureRecognizer +{ +public: + QSwipeGestureRecognizer(); + + QGesture *create(QObject *target); QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event); void reset(QGesture *state); }; -- cgit v0.12