1/****************************************************************************
2**
3** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt3D module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "buttonaxisinput_p.h"
41
42#include <Qt3DInput/qbuttonaxisinput.h>
43#include <Qt3DInput/qabstractphysicaldevice.h>
44
45#include <Qt3DInput/private/qabstractphysicaldevicebackendnode_p.h>
46#include <Qt3DInput/private/qbuttonaxisinput_p.h>
47#include <Qt3DInput/private/utils_p.h>
48
49QT_BEGIN_NAMESPACE
50
51namespace Qt3DInput {
52
53namespace Input {
54
55ButtonAxisInput::ButtonAxisInput()
56 : AbstractAxisInput()
57 , m_scale(0.0f)
58 , m_acceleration(-1.0f)
59 , m_deceleration(-1.0f)
60 , m_speedRatio(0.0f)
61 , m_lastUpdateTime(0)
62{
63}
64
65void ButtonAxisInput::cleanup()
66{
67 m_scale = 0.0f;
68 m_buttons.clear();
69 m_acceleration = -1.0f;
70 m_deceleration = -1.0f;
71 AbstractAxisInput::cleanup();
72}
73
74void ButtonAxisInput::updateSpeedRatio(qint64 currentTime, ButtonAxisInput::UpdateType type)
75{
76 const float accel = (type == Accelerate) ? acceleration() : -deceleration();
77
78 // Was in nanoseconds, while acceleration will be in units per square seconds
79 const float delta = m_lastUpdateTime ? (currentTime - m_lastUpdateTime) / 1000000000.0f : 0.0f;
80 const float speedRatio = m_speedRatio + delta * accel;
81
82 // Clamp it
83 m_speedRatio = qMax(a: 0.0f, b: qMin(a: speedRatio, b: 1.0f));
84
85 // If we stopped, time to start over
86 if (type == Decelerate && m_speedRatio == 0.0f)
87 m_lastUpdateTime = 0;
88 else
89 m_lastUpdateTime = currentTime;
90}
91
92void ButtonAxisInput::syncFromFrontEnd(const Qt3DCore::QNode *frontEnd, bool firstTime)
93{
94 AbstractAxisInput::syncFromFrontEnd(frontEnd, firstTime);
95 const QButtonAxisInput *node = qobject_cast<const QButtonAxisInput *>(object: frontEnd);
96 if (!node)
97 return;
98
99 m_scale = node->scale();
100 m_buttons = node->buttons();
101 m_acceleration = node->acceleration();
102 m_deceleration = node->deceleration();
103}
104
105namespace {
106
107bool anyOfRequiredButtonsPressed(const QVector<int> &buttons, QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend)
108{
109 bool validButtonWasPressed = false;
110 for (int button : buttons) {
111 if (physicalDeviceBackend->isButtonPressed(buttonIdentifier: button)) {
112 validButtonWasPressed = true;
113 break;
114 }
115 }
116 return validButtonWasPressed;
117}
118
119} // anonymous
120
121float ButtonAxisInput::process(InputHandler *inputHandler, qint64 currentTime)
122{
123 if (!isEnabled())
124 return 0.0f;
125
126 if (m_buttons.isEmpty())
127 return 0.0f;
128
129 QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend = Utils::physicalDeviceForInput(input: this, handler: inputHandler);
130 if (!physicalDeviceBackend)
131 return 0.0f;
132
133 // TO DO: Linear Curver for the progression of the scale value
134 if (anyOfRequiredButtonsPressed(buttons: m_buttons, physicalDeviceBackend))
135 updateSpeedRatio(currentTime, type: ButtonAxisInput::Accelerate);
136 else if (m_speedRatio != 0.0f)
137 updateSpeedRatio(currentTime, type: ButtonAxisInput::Decelerate);
138
139 return m_speedRatio * m_scale;
140}
141
142} // Input
143
144} // Qt3DInput
145
146QT_END_NAMESPACE
147

source code of qt3d/src/input/backend/buttonaxisinput.cpp