blob: fd7ce39cbe0e58e901c3b5dacb0f740296f537e6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/****************************************************************************
**
** 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>
#include <qmath.h>
QT_DATAVISUALIZATION_BEGIN_NAMESPACE
const qreal maxTapAndHoldJitter = 20;
const int maxPinchJitter = 10;
#if defined (Q_OS_ANDROID)
const int maxSelectionJitter = 10;
#else
const int maxSelectionJitter = 5;
#endif
const int tapAndHoldTime = 250;
const float rotationSpeed = 200.0f;
const int minZoomLevel = 10;
const int maxZoomLevel = 500;
/*!
* \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.
*
* Default touch input handler has the following functionalty:
* \table
* \header
* \li Gesture \li Action
* \row
* \li Touch-And-Move \li Rotate graph within limits set for Q3DCamera
* \row
* \li Tap \li Select item under pointer or remove selection if none
* \row
* \li Tap-And-Hold \li Select item under pointer or remove selection if none
* \row
* \li Pinch \li Zoom in/out within default range (10...500%)
* \row
* \li Tap on secondary view \li Return to primary view when in slice mode
* \note Slice mode is available in Q3DBars and Q3DSurface only
* \endtable
*/
/*!
* 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();
QPointF distance = points.at(0).pos() - points.at(1).pos();
d_ptr->handlePinchZoom(distance.manhattanLength());
} 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 {
// Handle possible tap-and-hold selection
d_ptr->m_startHoldPos = pointerPos;
d_ptr->m_touchHoldPos = d_ptr->m_startHoldPos;
d_ptr->m_holdTimer->start();
// Start rotating
setInputState(QDataVis::InputRotating);
setInputPosition(pointerPos.toPoint());
}
} else if (event->type() == QEvent::TouchEnd) {
d_ptr->m_holdTimer->stop();
// Handle possible selection
d_ptr->handleSelection(pointerPos);
} else if (event->type() == QEvent::TouchUpdate) {
if (!scene()->isSlicingActive()) {
d_ptr->m_touchHoldPos = pointerPos;
// Handle rotation
d_ptr->handleRotation(pointerPos);
}
}
} 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::handleTapAndHold);
}
QTouch3DInputHandlerPrivate::~QTouch3DInputHandlerPrivate()
{
m_holdTimer->stop();
delete m_holdTimer;
}
void QTouch3DInputHandlerPrivate::handlePinchZoom(qreal distance)
{
int newDistance = distance;
int prevDist = q_ptr->prevDistance();
if (prevDist > 0 && qAbs(prevDist - newDistance) < maxPinchJitter)
return;
q_ptr->setInputState(QDataVis::InputOnPinch);
Q3DCamera *camera = q_ptr->scene()->activeCamera();
int zoomLevel = camera->zoomLevel();
qreal zoomRate = qSqrt(qSqrt(zoomLevel));
if (newDistance > prevDist)
zoomLevel += zoomRate;
else
zoomLevel -= zoomRate;
if (zoomLevel > maxZoomLevel)
zoomLevel = maxZoomLevel;
else if (zoomLevel < minZoomLevel)
zoomLevel = minZoomLevel;
camera->setZoomLevel(zoomLevel);
q_ptr->setPrevDistance(newDistance);
}
void QTouch3DInputHandlerPrivate::handleTapAndHold()
{
QPointF distance = m_startHoldPos - m_touchHoldPos;
if (distance.manhattanLength() < maxTapAndHoldJitter) {
q_ptr->setInputPosition(m_touchHoldPos.toPoint());
q_ptr->setInputState(QDataVis::InputOnScene);
}
}
void QTouch3DInputHandlerPrivate::handleSelection(const QPointF &position)
{
QPointF distance = m_startHoldPos - position;
if (distance.manhattanLength() < maxSelectionJitter)
q_ptr->setInputState(QDataVis::InputOnScene);
else
q_ptr->setInputState(QDataVis::InputNone);
q_ptr->setPreviousInputPos(position.toPoint());
}
void QTouch3DInputHandlerPrivate::handleRotation(const QPointF &position)
{
if (QDataVis::InputRotating == q_ptr->inputState()) {
Q3DScene *scene = q_ptr->scene();
Q3DCamera *camera = scene->activeCamera();
QPointF rotations = camera->rotations();
float xRotation = rotations.x();
float yRotation = rotations.y();
QPointF inputPos = q_ptr->inputPosition();
float mouseMoveX = float(inputPos.x() - position.x())
/ (scene->viewport().width() / rotationSpeed);
float mouseMoveY = float(inputPos.y() - position.y())
/ (scene->viewport().height() / rotationSpeed);
xRotation -= mouseMoveX;
yRotation -= mouseMoveY;
camera->setRotations(QPointF(xRotation, yRotation));
camera->d_ptr->updateViewMatrix(1.0f);
q_ptr->setPreviousInputPos(inputPos.toPoint());
q_ptr->setInputPosition(position.toPoint());
}
}
QT_DATAVISUALIZATION_END_NAMESPACE
|
