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++ // Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #include "buttonaxisinput_p.h"
++
++ #include <Qt3DInput/qbuttonaxisinput.h>
++ #include <Qt3DInput/qabstractphysicaldevice.h>
++
++ #include <Qt3DInput/private/qabstractphysicaldevicebackendnode_p.h>
++ #include <Qt3DInput/private/qbuttonaxisinput_p.h>
++ #include <Qt3DInput/private/utils_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace Qt3DInput {
++
++ namespace Input {
++
++ ButtonAxisInput::ButtonAxisInput()
++ : AbstractAxisInput()
++ , m_scale(0.0f)
++ , m_acceleration(-1.0f)
++ , m_deceleration(-1.0f)
++ , m_speedRatio(0.0f)
++ , m_lastUpdateTime(0)
++ {
++ }
++
++ void ButtonAxisInput::cleanup()
++ {
++ m_scale = 0.0f;
++ m_buttons.clear();
++ m_acceleration = -1.0f;
++ m_deceleration = -1.0f;
++ AbstractAxisInput::cleanup();
++ }
++
++ void ButtonAxisInput::updateSpeedRatio(qint64 currentTime, ButtonAxisInput::UpdateType type)
++ {
++ const float accel = (type == Accelerate) ? acceleration() : -deceleration();
++
++ // Was in nanoseconds, while acceleration will be in units per square seconds
++ const float delta = m_lastUpdateTime ? (currentTime - m_lastUpdateTime) / 1000000000.0f : 0.0f;
++ const float speedRatio = m_speedRatio + delta * accel;
++
++ // Clamp it
++ m_speedRatio = qMax(0.0f, qMin(speedRatio, 1.0f));
++
++ // If we stopped, time to start over
++ if (type == Decelerate && m_speedRatio == 0.0f)
++ m_lastUpdateTime = 0;
++ else
++ m_lastUpdateTime = currentTime;
++ }
++
++ void ButtonAxisInput::syncFromFrontEnd(const Qt3DCore::QNode *frontEnd, bool firstTime)
++ {
++ AbstractAxisInput::syncFromFrontEnd(frontEnd, firstTime);
++ const QButtonAxisInput *node = qobject_cast<const QButtonAxisInput *>(frontEnd);
++ if (!node)
++ return;
++
++ m_scale = node->scale();
++ m_buttons = node->buttons();
++ m_acceleration = node->acceleration();
++ m_deceleration = node->deceleration();
++ }
++
++ namespace {
++
++ bool anyOfRequiredButtonsPressed(const QList<int> &buttons, QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend)
++ {
++ bool validButtonWasPressed = false;
++ for (int button : buttons) {
++ if (physicalDeviceBackend->isButtonPressed(button)) {
++ validButtonWasPressed = true;
++ break;
++ }
++ }
++ return validButtonWasPressed;
++ }
++
++ } // anonymous
++
++ float ButtonAxisInput::process(InputHandler *inputHandler, qint64 currentTime)
++ {
++ if (!isEnabled())
++ return 0.0f;
++
++ if (m_buttons.isEmpty())
++ return 0.0f;
++
++ QAbstractPhysicalDeviceBackendNode *physicalDeviceBackend = Utils::physicalDeviceForInput(this, inputHandler);
++ if (!physicalDeviceBackend)
++ return 0.0f;
++
++ // TO DO: Linear Curver for the progression of the scale value
++ if (anyOfRequiredButtonsPressed(m_buttons, physicalDeviceBackend))
++ updateSpeedRatio(currentTime, ButtonAxisInput::Accelerate);
++ else if (m_speedRatio != 0.0f)
++ updateSpeedRatio(currentTime, ButtonAxisInput::Decelerate);
++
++ return m_speedRatio * m_scale;
++ }
++
++ } // Input
++
++ } // Qt3DInput
++
++ QT_END_NAMESPACE