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 #include <QGraphicsWidget>
  14
  15 KTwoFingerTapRecognizer::KTwoFingerTapRecognizer() :
  16     QGestureRecognizer(),
  17     m_gestureTriggered(false)
  18 {
  19 }
  20
  21 KTwoFingerTapRecognizer::~KTwoFingerTapRecognizer()
  22 {
  23 }
  24
  25 QGesture* KTwoFingerTapRecognizer::create(QObject*)
  26 {
  27     return static_cast<QGesture*>(new KTwoFingerTap());
  28 }
  29
  30 QGestureRecognizer::Result KTwoFingerTapRecognizer::recognize(QGesture* gesture, QObject* watched, QEvent* event)
  31 {
  32     if (qobject_cast<QGraphicsWidget*>(watched)) {
  33         return Ignore;
  34     }
  35
  36     KTwoFingerTap* const kTwoFingerTap = static_cast<KTwoFingerTap*>(gesture);
  37     const QTouchEvent* touchEvent = static_cast<const QTouchEvent*>(event);
  38
  39     switch (event->type()) {
  40     case QEvent::TouchBegin: {
  41         kTwoFingerTap->setHotSpot(touchEvent->touchPoints().first().startScreenPos());
  42         kTwoFingerTap->setPos(touchEvent->touchPoints().first().startPos());
  43         kTwoFingerTap->setScreenPos(touchEvent->touchPoints().first().startScreenPos());
  44         kTwoFingerTap->setScenePos(touchEvent->touchPoints().first().startScenePos());
  45         m_gestureTriggered = false;
  46         return MayBeGesture;
  47     }
  48
  49     case QEvent::TouchUpdate: {
  50
  51         if (touchEvent->touchPoints().size() > 2) {
  52             m_gestureTriggered = false;
  53             return CancelGesture;
  54         }
  55
  56         if (touchEvent->touchPoints().size() == 2) {
  57             if ((touchEvent->touchPoints().first().startPos() - touchEvent->touchPoints().first().pos()).manhattanLength() >= QApplication::startDragDistance()) {
  58                 m_gestureTriggered = false;
  59                 return CancelGesture;
  60             }
  61             if ((touchEvent->touchPoints().at(1).startPos() - touchEvent->touchPoints().at(1).pos()).manhattanLength() >= QApplication::startDragDistance()) {
  62                 m_gestureTriggered = false;
  63                 return CancelGesture;
  64             }
  65             if (touchEvent->touchPointStates() & Qt::TouchPointPressed) {
  66                 m_gestureTriggered = true;
  67             }
  68             if (touchEvent->touchPointStates() & Qt::TouchPointReleased && m_gestureTriggered) {
  69                 m_gestureTriggered = false;
  70                 return FinishGesture;
  71             }
  72         }
  73         break;
  74     }
  75
  76     default:
  77         return Ignore;
  78     }
  79     return Ignore;
  80 }
  81
  82 KTwoFingerTap::KTwoFingerTap(QObject* parent) :
  83     QGesture(parent),
  84     m_pos(QPointF(-1, -1)),
  85     m_screenPos(QPointF(-1, -1)),
  86     m_scenePos(QPointF(-1, -1))
  87 {
  88 }
  89
  90 KTwoFingerTap::~KTwoFingerTap()
  91 {
  92 }
  93
  94 QPointF KTwoFingerTap::pos() const
  95 {
  96     return m_pos;
  97 }
  98
  99 void KTwoFingerTap::setPos(QPointF _pos)
 100 {
 101     m_pos = _pos;
 102 }
 103
 104 QPointF KTwoFingerTap::screenPos() const
 105 {
 106     return m_screenPos;
 107 }
 108
 109 void KTwoFingerTap::setScreenPos(QPointF _screenPos)
 110 {
 111     m_screenPos = _screenPos;
 112 }
 113
 114 QPointF KTwoFingerTap::scenePos() const
 115 {
 116     return m_scenePos;
 117 }
 118
 119 void KTwoFingerTap::setScenePos(QPointF _scenePos)
 120 {
 121     m_scenePos = _scenePos;
 122 }