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/*
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, version 2.1 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not,
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* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".
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*
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* Description:
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*
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*/
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/*
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W A R N I N G
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-------------
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THIS IS A TEMPORARY GESTURE CODE. WOULD BE REPLACED WHEN BROWSER HAS ITS OWN GESTURE FRAMEWORK
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*/
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#include "GestureRecognizer.h"
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#include "GestureListener.h"
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#include "GestureRecognizer_p.h"
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#include <QtGui>
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static const int DoubleClickFilterDuration = 300;
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static const int LongClickFilterDuration = 1000;
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static const int MinTimeHoldForClick = 50;
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static const int ThresholdForMove = 30;
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namespace GVA {
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GestureRecognizer::GestureRecognizer(GestureListener* gestureListener)
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: d_ptr(new GestureRecognizerPrivate(gestureListener))
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{
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Q_D(GestureRecognizer);
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d->q_ptr = this;
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}
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GestureRecognizer::~GestureRecognizer()
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{ }
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bool GestureRecognizer::mouseEventFilter(QGraphicsSceneMouseEvent* event)
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{
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Q_D(GestureRecognizer);
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bool handled = false;
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switch(event->type()) {
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case QEvent::GraphicsSceneMouseDoubleClick:
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handled = d->mouseDoubleClickEvent(event);
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break;
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case QEvent::GraphicsSceneMouseMove:
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handled = d->mouseMoveEvent(event);
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break;
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case QEvent::GraphicsSceneMousePress:
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handled = d->mousePressEvent(event);
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break;
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case QEvent::GraphicsSceneMouseRelease:
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handled = d->mouseReleaseEvent(event);
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break;
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case QEvent::GraphicsSceneContextMenu:
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//Swallow context menu event.
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//Since we have own way of handling it
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handled = true;
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default:
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break;
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}
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return handled;
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}
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qreal GestureRecognizer::dragInertia() const
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{
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Q_D(const GestureRecognizer);
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return d->m_dragInertia;
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}
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void GestureRecognizer::setDragInertia(qreal inertia)
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{
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Q_D(GestureRecognizer);
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d->m_dragInertia = inertia;
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}
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int GestureRecognizer::directionErrorMargin() const
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{
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Q_D(const GestureRecognizer);
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return d->m_directionErrorMargin;
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}
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void GestureRecognizer::setDirectionErrorMargin(int errorMargin)
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{
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Q_D(GestureRecognizer);
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d->m_directionErrorMargin = errorMargin;
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}
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qreal GestureRecognizer::axisLockThreshold() const
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{
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Q_D(const GestureRecognizer);
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return d->m_axisLockThreshold;
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}
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void GestureRecognizer::setAxisLockThreshold(qreal threshold)
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{
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Q_D(GestureRecognizer);
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d->m_axisLockThreshold = threshold;
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}
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qreal GestureRecognizer::maximumVelocity() const
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{
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Q_D(const GestureRecognizer);
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return d->m_maxVelocity;
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}
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void GestureRecognizer::setMaximumVelocity(qreal v)
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{
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Q_D(GestureRecognizer);
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d->m_maxVelocity = v;
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}
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qreal GestureRecognizer::minimumVelocity() const
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{
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Q_D(const GestureRecognizer);
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return d->m_minVelocity;
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}
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void GestureRecognizer::setMinimumVelocity(qreal v)
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{
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Q_D(GestureRecognizer);
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d->m_minVelocity = v;
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}
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int GestureRecognizer::panningThreshold() const
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{
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Q_D(const GestureRecognizer);
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return d->m_panningThreshold;
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}
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void GestureRecognizer::setPanningThreshold(int threshold)
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{
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Q_D(GestureRecognizer);
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d->m_panningThreshold = threshold;
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}
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qreal GestureRecognizer::fastVelocityFactor() const
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{
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Q_D(const GestureRecognizer);
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return d->m_fastVelocityFactor;
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}
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void GestureRecognizer::setFastVelocityFactor(qreal v)
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{
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Q_D(GestureRecognizer);
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d->m_fastVelocityFactor = v;
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}
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int GestureRecognizer::scrollsPerSecond() const
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{
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Q_D(const GestureRecognizer);
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return d->m_fastVelocityFactor;
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}
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void GestureRecognizer::setScrollsPerSecond(int sps)
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{
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Q_D(GestureRecognizer);
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d->m_scrollsPerSecond = sps;
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}
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//
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//GestureRecognizerPrivate DIFINITION
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//
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GestureRecognizerPrivate::GestureRecognizerPrivate(GestureListener* gestureListener)
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: m_gestureListener(gestureListener)
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, m_state(GestureRecognizerPrivate::Inactive)
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, m_dragInertia(0.85)
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, m_directionErrorMargin(10)
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, m_axisLockThreshold(0)
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, m_maxVelocity(3500)
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, m_minVelocity(10)
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, m_panningThreshold(25)
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, m_fastVelocityFactor(0.01)
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, m_scrollsPerSecond(20)
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, m_velocity(QPointF(0, 0))
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, m_position(QPointF(-1, -1))
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, m_initialPos(QPointF(-1, -1))
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{ }
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GestureRecognizerPrivate::~GestureRecognizerPrivate()
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{ }
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bool GestureRecognizerPrivate::mousePressEvent(QGraphicsSceneMouseEvent* event)
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{
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if (event->button() != Qt::LeftButton)
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return false;
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if (m_state == GestureRecognizerPrivate::Inactive) {
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//First mouse press.
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m_position = event->scenePos();
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m_initialPos = m_position;
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changeState(GestureRecognizerPrivate::Press);
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GestureEvent gesture = gestureEvent(m_initialPos, GestureEvent::Touch);
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m_gestureListener->handleGesture(&gesture);
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m_lastTime.start();
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m_delayedPressMoment.start();
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m_timer.start(LongClickFilterDuration, this);
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} else if(m_state == GestureRecognizerPrivate::Release) {
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//This press is for double tap.
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changeState(GestureRecognizerPrivate::DoublePress);
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}
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event->setAccepted(true);
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return true;
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}
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bool GestureRecognizerPrivate::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)
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{
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if (event->button() != Qt::LeftButton)
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return true;
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if (m_state == GestureRecognizerPrivate::Inactive) {
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//Release event cannot be generated in gesture recognizer is in active!
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event->setAccepted(true);
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resetTouchPositions();
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return true;
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}
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if (m_state == GestureRecognizerPrivate::Press) {
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if (m_delayedPressMoment.elapsed() > MinTimeHoldForClick) {
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//Waiting for MinTimeHoldForClick to make sure use has actually pressed.
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//Removes accidentall press
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changeState(GestureRecognizerPrivate::Release);
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m_timer.start(DoubleClickFilterDuration, this);
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} else
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resetTouchPositions();
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} else if (m_state == GestureRecognizerPrivate::Move) {
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if (qAbs(m_velocity.x()) > m_minVelocity
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|| qAbs(m_velocity.y()) > m_minVelocity) {
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GestureEvent gesture = gestureEvent(m_position, GestureEvent::Flick);
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gesture.setVelocity(m_velocity);
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m_gestureListener->handleGesture(&gesture);
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}
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m_velocity = QPointF(0,0);
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resetTouchPositions();
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} else if (m_state == GestureRecognizerPrivate::DoublePress) {
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//Stop double tap timer
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m_timer.stop();
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GestureEvent gesture = gestureEvent(m_initialPos, GestureEvent::DoubleTap);
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m_gestureListener->handleGesture(&gesture);
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resetTouchPositions();
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}
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event->setAccepted(true);
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return true;
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}
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bool GestureRecognizerPrivate::mouseMoveEvent(QGraphicsSceneMouseEvent* event)
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{
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QPoint delta;
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if (m_state == GestureRecognizerPrivate::Press) {
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delta = (event->scenePos() - m_initialPos).toPoint();
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QPoint absDelta;
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absDelta.setX(qAbs(delta.x()));
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absDelta.setY(qAbs(delta.y()));
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if ((absDelta.x() > ThresholdForMove) || (absDelta.y() > ThresholdForMove)) {
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//Stop long tap timer
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m_timer.stop();
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changeState(GestureRecognizerPrivate::Move);
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m_position = event->scenePos();
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} else {
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//Ignore until user has actually moved
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return true;
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}
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} else if (m_state == GestureRecognizerPrivate::Move) {
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delta = (event->scenePos() - m_position).toPoint();
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m_position = event->scenePos();
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} else {
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resetTouchPositions();
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return true;
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}
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//Aplly if axis stickiness is specified.
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if (m_axisLockThreshold) {
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int dx = qAbs(delta.x());
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int dy = qAbs(delta.y());
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if (dx || dy) {
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bool vertical = (dy > dx);
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qreal alpha = qreal(vertical ? dx : dy) / qreal(vertical ? dy : dx);
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if (alpha <= m_axisLockThreshold) {
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if (vertical)
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delta.setX(0);
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else
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delta.setY(0);
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}
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}
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}
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m_velocity = calculateVelocity(delta, m_lastTime.elapsed());
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//Send pan gesture
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GestureEvent gesture = gestureEvent(m_position, GestureEvent::Pan);
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gesture.setDelta(delta);
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m_gestureListener->handleGesture(&gesture);
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m_lastTime.restart();
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event->setAccepted(true);
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return true;
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}
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bool GestureRecognizerPrivate::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event)
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{
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if (m_state == GestureRecognizerPrivate::Release) {
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m_timer.stop();
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GestureEvent gesture = gestureEvent(m_initialPos, GestureEvent::DoubleTap);
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m_gestureListener->handleGesture(&gesture);
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}
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resetTouchPositions();
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event->setAccepted(true);
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return true;
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}
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void GestureRecognizerPrivate::changeState(GestureRecognizerPrivate::State state)
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{
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m_state = state;
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}
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GestureEvent GestureRecognizerPrivate::gestureEvent(const QPointF& pos, GestureEvent::Type type)
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{
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GestureEvent gestureEvent;
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gestureEvent.setType(type);
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gestureEvent.setPosition(pos);
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return gestureEvent;
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}
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void GestureRecognizerPrivate::timerEvent(QTimerEvent* event)
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{
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if (event->timerId() != m_timer.timerId())
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return;
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m_timer.stop();
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QPointF position;
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GestureEvent::Type gestureType;
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if (m_state == GestureRecognizerPrivate::Press) {
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//Long press
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position = m_position;
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gestureType = GestureEvent::LongTap;
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} else if (m_state == GestureRecognizerPrivate::Release) {
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//Actual release event
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position = m_initialPos;
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gestureType = GestureEvent::Release;
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} else {
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resetTouchPositions();
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changeState(GestureRecognizerPrivate::Inactive);
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return;
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}
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resetTouchPositions();
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GestureEvent gesture = gestureEvent(position, gestureType);
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m_gestureListener->handleGesture(&gesture);
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return;
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}
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void GestureRecognizerPrivate::resetTouchPositions()
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{
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m_position = QPointF(-1, -1);
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m_initialPos = m_position;
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changeState(GestureRecognizerPrivate::Inactive);
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}
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QPointF GestureRecognizerPrivate::calculateVelocity(const QPointF& delta, int time)
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{
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QPointF newVelocity = m_velocity;
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if ((delta / qreal(time)).manhattanLength() < 25) {
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QPointF rawVelocity = delta / qreal(time) * qreal(1000) / qreal(m_scrollsPerSecond);
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newVelocity = newVelocity * (qreal(1) - m_dragInertia) + rawVelocity * m_dragInertia;
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}
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newVelocity.setX(delta.x() ? qBound(-m_maxVelocity, newVelocity.x(), m_maxVelocity) : m_velocity.x());
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newVelocity.setY(delta.y() ? qBound(-m_maxVelocity, newVelocity.y(), m_maxVelocity) : m_velocity.y());
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return newVelocity;
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}
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} // namespace GVA
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