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++ // Copyright (C) 2017 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 "qlevelofdetailswitch.h"
++ #include "qlevelofdetailswitch_p.h"
++ #include "qlevelofdetail_p.h"
++ #include "qglobal.h"
++ #include <Qt3DCore/QEntity>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace Qt3DRender {
++
++ QLevelOfDetailSwitchPrivate::QLevelOfDetailSwitchPrivate()
++ : QLevelOfDetailPrivate()
++ {
++
++ }
++
++ void QLevelOfDetailSwitchPrivate::setCurrentIndex(int currentIndex)
++ {
++ Q_Q(QLevelOfDetailSwitch);
++
++ bool changed = m_currentIndex != currentIndex;
++ QLevelOfDetailPrivate::setCurrentIndex(currentIndex);
++
++ if (!changed)
++ return;
++
++ int entityIndex = 0;
++ const auto entities = q->entities();
++ for (Qt3DCore::QEntity *entity : entities) {
++ const auto childNodes = entity->childNodes();
++ for (Qt3DCore::QNode *childNode : childNodes) {
++ Qt3DCore::QEntity *childEntity = qobject_cast<Qt3DCore::QEntity *>(childNode);
++ if (childEntity) {
++ childEntity->setEnabled(entityIndex == currentIndex);
++ entityIndex++;
++ }
++ }
++
++ break; // only work on the first entity, LOD should not be shared
++ }
++ }
++
++ /*!
++ \class Qt3DRender::QLevelOfDetailSwitch
++ \inmodule Qt3DRender
++ \inherits Qt3DRender::QLevelOfDetail
++ \since 5.9
++ \brief Provides a way of enabling child entities based on distance or screen size.
++
++ This component is assigned to an entity. When the entity changes distance relative
++ to the camera, the QLevelOfDetailSwitch will disable all the child entities except
++ the one matching index Qt3DRender::QLevelOfDetailSwitch::currentIndex.
++ */
++
++ /*!
++ \qmltype LevelOfDetailSwitch
++ \nativetype Qt3DRender::QLevelOfDetailSwitch
++ \inherits Component3D
++ \inqmlmodule Qt3D.Render
++ \since 5.9
++ \brief Provides a way of enabling child entities based on distance or screen size.
++
++ This component is assigned to an entity. When the entity changes distance relative
++ to the camera, the LevelOfDetailSwitch will disable all the child entities except
++ the one matching index \l currentIndex.
++
++ \sa LevelOfDetail
++ */
++
++ /*!
++ \qmlproperty int LevelOfDetailSwitch::currentIndex
++
++ The index of the presently selected child entity.
++ */
++
++ /*! \fn Qt3DRender::QLevelOfDetailSwitch::QLevelOfDetailSwitch(Qt3DCore::QNode *parent)
++ Constructs a new QLevelOfDetailSwitch with the specified \a parent.
++ */
++ QLevelOfDetailSwitch::QLevelOfDetailSwitch(QNode *parent)
++ : QLevelOfDetail(*new QLevelOfDetailSwitchPrivate(), parent)
++ {
++ Q_D(QLevelOfDetailSwitch);
++ d->m_currentIndex = -1;
++ }
++
++ /*! \internal */
++ QLevelOfDetailSwitch::~QLevelOfDetailSwitch()
++ {
++ }
++
++ /*! \internal */
++ QLevelOfDetailSwitch::QLevelOfDetailSwitch(QLevelOfDetailPrivate &dd, QNode *parent)
++ : QLevelOfDetail(dd, parent)
++ {
++ }
++
++ } // namespace Qt3DRender
++
++ QT_END_NAMESPACE
++
++ #include "moc_qlevelofdetailswitch.cpp"