src/kitemviews/private/ktwofingertap.cpp

   1 /*
   2  * SPDX-FileCopyrightText: 2020 Steffen Hartleib <steffenhartleib@t-online.de>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-or-later
   5  */
   6
   7 // Self
   8 #include "ktwofingertap.h"
   9
  10 // Qt
  11 #include <QTouchEvent>
  12 #include <QApplication>
  13
  14 KTwoFingerTapRecognizer::KTwoFingerTapRecognizer() :
  15     QGestureRecognizer(),
  16     m_gestureTriggered(false)
  17 {
  18 }
  19
  20 KTwoFingerTapRecognizer::~KTwoFingerTapRecognizer()
  21 {
  22 }
  23
  24 QGesture* KTwoFingerTapRecognizer::create(QObject*)
  25 {
  26     return static_cast<QGesture*>(new KTwoFingerTap());
  27 }
  28
  29 QGestureRecognizer::Result KTwoFingerTapRecognizer::recognize(QGesture* gesture, QObject* watched, QEvent* event)
  30 {
  31     Q_UNUSED(watched)
  32
  33     KTwoFingerTap* const kTwoFingerTap = static_cast<KTwoFingerTap*>(gesture);
  34     const QTouchEvent* touchEvent = static_cast<const QTouchEvent*>(event);
  35
  36     switch (event->type()) {
  37     case QEvent::TouchBegin: {
  38         kTwoFingerTap->setHotSpot(touchEvent->touchPoints().first().startScreenPos());
  39         kTwoFingerTap->setPos(touchEvent->touchPoints().first().startPos());
  40         kTwoFingerTap->setScreenPos(touchEvent->touchPoints().first().startScreenPos());
  41         kTwoFingerTap->setScenePos(touchEvent->touchPoints().first().startScenePos());
  42         m_gestureTriggered = false;
  43         return MayBeGesture;
  44     }
  45
  46     case QEvent::TouchUpdate: {
  47
  48         if (touchEvent->touchPoints().size() > 2) {
  49             m_gestureTriggered = false;
  50             return CancelGesture;
  51         }
  52
  53         if (touchEvent->touchPoints().size() == 2) {
  54             if ((touchEvent->touchPoints().first().startPos() - touchEvent->touchPoints().first().pos()).manhattanLength() >= QApplication::startDragDistance()) {
  55                 m_gestureTriggered = false;
  56                 return CancelGesture;
  57             }
  58             if ((touchEvent->touchPoints().at(1).startPos() - touchEvent->touchPoints().at(1).pos()).manhattanLength() >= QApplication::startDragDistance()) {
  59                 m_gestureTriggered = false;
  60                 return CancelGesture;
  61             }
  62             if (touchEvent->touchPointStates() & Qt::TouchPointPressed) {
  63                 m_gestureTriggered = true;
  64             }
  65             if (touchEvent->touchPointStates() & Qt::TouchPointReleased && m_gestureTriggered) {
  66                 m_gestureTriggered = false;
  67                 return FinishGesture;
  68             }
  69         }
  70         break;
  71     }
  72
  73     default:
  74         return Ignore;
  75     }
  76     return Ignore;
  77 }
  78
  79 KTwoFingerTap::KTwoFingerTap(QObject* parent) :
  80     QGesture(parent),
  81     m_pos(QPointF(-1, -1)),
  82     m_screenPos(QPointF(-1, -1)),
  83     m_scenePos(QPointF(-1, -1))
  84 {
  85 }
  86
  87 KTwoFingerTap::~KTwoFingerTap()
  88 {
  89 }
  90
  91 QPointF KTwoFingerTap::pos() const
  92 {
  93     return m_pos;
  94 }
  95
  96 void KTwoFingerTap::setPos(QPointF _pos)
  97 {
  98     m_pos = _pos;
  99 }
 100
 101 QPointF KTwoFingerTap::screenPos() const
 102 {
 103     return m_screenPos;
 104 }
 105
 106 void KTwoFingerTap::setScreenPos(QPointF _screenPos)
 107 {
 108     m_screenPos = _screenPos;
 109 }
 110
 111 QPointF KTwoFingerTap::scenePos() const
 112 {
 113     return m_scenePos;
 114 }
 115
 116 void KTwoFingerTap::setScenePos(QPointF _scenePos)
 117 {
 118     m_scenePos = _scenePos;
 119 }