File indexing completed on 2024-04-28 15:32:16

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2021 Steffen Hartleib <steffenhartleib@t-online.de>
 
     SPDX-License-Identifier: LGPL-2.1-or-later
 */
 
 // Self
 #include "ktwofingertap.h"
 
 // Qt
 #include <QApplication>
 #include <QGraphicsWidget>
 #include <QTouchEvent>
 
 class KTwoFingerTapRecognizerPrivate
 {
 public:
     KTwoFingerTapRecognizerPrivate(KTwoFingerTapRecognizer *parent)
         : q(parent)
     {
     }
     KTwoFingerTapRecognizer *const q;
     bool mGestureTriggered = false;
     int mTapRadius = 40;  // same as Qt::TapGesture
     Qt::GestureState mLastState = Qt::NoGesture;
 };
 
 KTwoFingerTapRecognizer::KTwoFingerTapRecognizer()
     : QGestureRecognizer()
     , d(new KTwoFingerTapRecognizerPrivate(this))
 {
 }
 
 KTwoFingerTapRecognizer::~KTwoFingerTapRecognizer()
 {
 }
 
 QGesture* KTwoFingerTapRecognizer::create(QObject *target)
 {
     Q_UNUSED(target)
     return static_cast<QGesture *>(new KTwoFingerTap());
 }
 
 QGestureRecognizer::Result KTwoFingerTapRecognizer::recognize(QGesture *gesture, QObject *watched, QEvent *event)
 {
     Q_UNUSED(watched)
 
     KTwoFingerTap *ktwoFingerTap = static_cast<KTwoFingerTap *>(gesture);
     const QTouchEvent *touchEvent = static_cast<const QTouchEvent *>(event);
 
     switch (event->type()) {
     case QEvent::TouchBegin: {
         const QTouchEvent::TouchPoint tp = touchEvent->touchPoints().first();
         ktwoFingerTap->setHotSpot(tp.startScreenPos());
         ktwoFingerTap->setPos(tp.startPos());
         ktwoFingerTap->setScreenPos(tp.startScreenPos());
         ktwoFingerTap->setScenePos(tp.startScenePos());
         d->mLastState = Qt::NoGesture;
         return MayBeGesture;
     }
 
     case QEvent::TouchUpdate: {
         // The gesture was already canceled or finished, so we will ignore this event.
         if (d->mLastState == Qt::GestureCanceled || d->mLastState == Qt::GestureFinished) {
             return Ignore;
         }
 
         const int touchPointSize = touchEvent->touchPoints().size();
 
         if (touchPointSize > 2) {
             d->mLastState = Qt::GestureCanceled;
             return CancelGesture;
         }
 
         if (touchPointSize == 2) {
             if ((touchEvent->touchPoints().first().startPos() - touchEvent->touchPoints().first().pos()).manhattanLength() > d->mTapRadius) {
                 d->mLastState = Qt::GestureCanceled;
                 return CancelGesture;
             }
             if ((touchEvent->touchPoints().at(1).startPos() - touchEvent->touchPoints().at(1).pos()).manhattanLength() > d->mTapRadius) {
                 d->mLastState = Qt::GestureCanceled;
                 return CancelGesture;
             }
             if (touchEvent->touchPointStates() & Qt::TouchPointPressed) {
                 d->mLastState = gesture->state() == Qt::NoGesture ? Qt::GestureStarted : Qt::GestureUpdated;
                 return TriggerGesture;
             }
             if (touchEvent->touchPointStates() & Qt::TouchPointMoved) {
                 d->mLastState = gesture->state() == Qt::NoGesture ? Qt::GestureStarted : Qt::GestureUpdated;
                 return TriggerGesture;
             }
             if (touchEvent->touchPointStates() & Qt::TouchPointReleased) {
                 d->mLastState = Qt::GestureFinished;
                 return FinishGesture;
             }
         }
         break;
     }
 
     case QEvent::TouchEnd: {
         if (d->mLastState == Qt::GestureStarted || d->mLastState == Qt::GestureUpdated) {
             return FinishGesture;
         }
         break;
     }
 
     default:
         return Ignore;
     }
     return Ignore;
 }
 
 void KTwoFingerTapRecognizer::setTapRadius(int i)
 {
     if (i < 0) {
         i = 0;
     }
 
     d->mTapRadius = i;
 }
 
 int KTwoFingerTapRecognizer::tapRadius() const
 {
     return d->mTapRadius;
 }
 
 class KTwoFingerTapPrivate
 {
 public:
     KTwoFingerTapPrivate(KTwoFingerTap *parent)
         : q(parent)
     {
     }
     KTwoFingerTap *const q;
     QPointF mPos = QPointF(-1, -1);
     QPointF mScreenPos = QPointF(-1, -1);
     QPointF mScenePos = QPointF(-1, -1);
 };
 
 KTwoFingerTap::KTwoFingerTap(QObject *parent)
     : QGesture(parent)
     , d(new KTwoFingerTapPrivate(this))
 {
 }
 
 KTwoFingerTap::~KTwoFingerTap()
 {
 }
 
 QPointF KTwoFingerTap::pos() const
 {
     return d->mPos;
 }
 
 void KTwoFingerTap::setPos(QPointF _pos)
 {
     d->mPos = _pos;
 }
 
 QPointF KTwoFingerTap::screenPos() const
 {
     return d->mScreenPos;
 }
 
 void KTwoFingerTap::setScreenPos(QPointF _screenPos)
 {
     d->mScreenPos = _screenPos;
 }
 
 QPointF KTwoFingerTap::scenePos() const
 {
     return d->mScenePos;
 }
 
 void KTwoFingerTap::setScenePos(QPointF _scenePos)
 {
     d->mScenePos = _scenePos;
 }
 
 #include "moc_ktwofingertap.cpp"