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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#include "qtouch3dinputhandler_p.h"
#include "q3dcamera_p.h"
#include <QTimer>
QT_DATAVISUALIZATION_BEGIN_NAMESPACE
const qreal maxTapAndHoldJitter = 20;
const int tapAndHoldTime = 250;
const float rotationSpeed = 200.0f;
const int zoomRateFar = 9;
const int zoomRateMid = 5;
const int zoomRateNear = 1;
/*!
\class QTouch3DInputHandler
\inmodule QtDataVisualization
\brief Basic touch display based input handler.
\since 1.0.0
QTouch3DInputHandler is the basic input handler for touch screen devices.
*/
/*!
* Constructs the basic touch display input handler. An optional \a parent parameter can be given
* and is then passed to QObject constructor.
*/
QTouch3DInputHandler::QTouch3DInputHandler(QObject *parent)
: Q3DInputHandler(parent),
d_ptr(new QTouch3DInputHandlerPrivate(this))
{
}
/*!
* Destroys the input handler.
*/
QTouch3DInputHandler::~QTouch3DInputHandler()
{
}
/*!
* Override this to change handling of touch events.
* Touch event is given in the \a event.
*/
void QTouch3DInputHandler::touchEvent(QTouchEvent *event)
{
QList<QTouchEvent::TouchPoint> points;
points = event->touchPoints();
if (!scene()->isSlicingActive() && points.count() == 2) {
d_ptr->m_holdTimer->stop();
setInputState(QDataVis::InputOnPinch);
QPointF distance = points.at(0).pos() - points.at(1).pos();
int newDistance = distance.manhattanLength();
int zoomRate = zoomRateFar;
int zoomLevel = scene()->activeCamera()->zoomLevel();
if (zoomLevel > 250)
zoomRate = zoomRateNear;
else if (zoomLevel > 100)
zoomRate = zoomRateMid;
if (newDistance > prevDistance())
zoomLevel += zoomRate;
else
zoomLevel -= zoomRate;
if (zoomLevel > 500)
zoomLevel = 500;
else if (zoomLevel < 10)
zoomLevel = 10;
scene()->activeCamera()->setZoomLevel(zoomLevel);
setPrevDistance(newDistance);
} else if (points.count() == 1) {
QPointF pointerPos = points.at(0).pos();
if (event->type() == QEvent::TouchBegin) {
if (scene()->isSlicingActive()) {
if (scene()->isPointInPrimarySubView(pointerPos.toPoint()))
setInputState(QDataVis::InputOnOverview);
else if (scene()->isPointInSecondarySubView(pointerPos.toPoint()))
setInputState(QDataVis::InputOnSlice);
else
setInputState(QDataVis::InputNone);
} else {
// Possible tap-and-hold selection start
d_ptr->m_startHoldPos = pointerPos;
d_ptr->m_touchHoldPos = d_ptr->m_startHoldPos;
d_ptr->m_holdTimer->start();
// Set state to rotating
setInputState(QDataVis::InputRotating);
// update pointer positions to prevent jumping when releasing or repressing a button
setInputPosition(pointerPos.toPoint());
}
} else if (event->type() == QEvent::TouchEnd) {
d_ptr->m_holdTimer->stop();
setInputState(QDataVis::InputNone);
// update pointer positions to prevent jumping when releasing or repressing a button
setPreviousInputPos(pointerPos.toPoint());
} else if (event->type() == QEvent::TouchUpdate) {
if (!scene()->isSlicingActive()) {
d_ptr->m_touchHoldPos = pointerPos;
if (QDataVis::InputRotating == inputState()) {
// Calculate mouse movement since last frame
QPointF rotations = scene()->activeCamera()->rotations();
float xRotation = rotations.x();
float yRotation = rotations.y();
// TODO: Replace with event's previous position functionality?
float mouseMoveX = float(inputPosition().x() - pointerPos.x())
/ (scene()->viewport().width() / rotationSpeed);
float mouseMoveY = float(inputPosition().y() - pointerPos.y())
/ (scene()->viewport().height() / rotationSpeed);
// Apply to rotations
xRotation -= mouseMoveX;
yRotation -= mouseMoveY;
scene()->activeCamera()->setRotations(QPointF(xRotation, yRotation));
scene()->activeCamera()->d_ptr->updateViewMatrix(1.0f);
setPreviousInputPos(inputPosition());
setInputPosition(pointerPos.toPoint());
}
}
}
} else {
d_ptr->m_holdTimer->stop();
}
}
QTouch3DInputHandlerPrivate::QTouch3DInputHandlerPrivate(QTouch3DInputHandler *q)
: q_ptr(q),
m_holdTimer(0)
{
m_holdTimer = new QTimer();
m_holdTimer->setSingleShot(true);
m_holdTimer->setInterval(tapAndHoldTime);
connect(m_holdTimer, &QTimer::timeout, this, &QTouch3DInputHandlerPrivate::tapAndHold);
}
QTouch3DInputHandlerPrivate::~QTouch3DInputHandlerPrivate()
{
m_holdTimer->stop();
delete m_holdTimer;
}
void QTouch3DInputHandlerPrivate::tapAndHold()
{
QPointF distance = m_startHoldPos - m_touchHoldPos;
if (distance.manhattanLength() < maxTapAndHoldJitter) {
q_ptr->setInputPosition(m_touchHoldPos.toPoint());
q_ptr->setInputState(QDataVis::InputOnScene);
}
}
QT_DATAVISUALIZATION_END_NAMESPACE
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