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++ // Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include <Qt3DQuickExtras/qt3dquickwindow.h>
++ #include <Qt3DRender/QSceneLoader>
++ #include <Qt3DCore/QEntity>
++
++ #include <QGuiApplication>
++ #include <qqml.h>
++
++ class SceneHelper : public QObject
++ {
++ Q_OBJECT
++
++ public:
++ Q_INVOKABLE QObject *findEntity(Qt3DRender::QSceneLoader *loader, const QString &name);
++ Q_INVOKABLE QObject *findComponent(Qt3DCore::QEntity *entity, const QString &componentMetatype);
++ Q_INVOKABLE void addListEntry(const QVariant &list, QObject *entry);
++ };
++
++ QObject *SceneHelper::findEntity(Qt3DRender::QSceneLoader *loader, const QString &name)
++ {
++ // The QSceneLoader instance is a component of an entity. The loaded scene
++ // tree is added under this entity.
++ QList<Qt3DCore::QEntity *> entities = loader->entities();
++
++ if (entities.isEmpty())
++ return 0;
++
++ // Technically there could be multiple entities referencing the scene loader
++ // but sharing is discouraged, and in our case there will be one anyhow.
++ Qt3DCore::QEntity *root = entities[0];
++
++ // The scene structure and names always depend on the asset.
++ return root->findChild<Qt3DCore::QEntity *>(name);
++ }
++
++ QObject *SceneHelper::findComponent(Qt3DCore::QEntity *entity, const QString &componentMetatype)
++ {
++ Q_ASSERT(entity);
++ const Qt3DCore::QComponentVector components = entity->components();
++ for (Qt3DCore::QComponent *component : components) {
++ qDebug() << component->metaObject()->className();
++ if (component->metaObject()->className() == componentMetatype) {
++ return component;
++ }
++ }
++ return nullptr;
++ }
++
++ void SceneHelper::addListEntry(const QVariant &list, QObject *entry)
++ {
++ QQmlListReference ref = list.value<QQmlListReference>();
++ ref.append(entry);
++ }
++
++ int main(int argc, char* argv[])
++ {
++ QGuiApplication app(argc, argv);
++
++ Qt3DExtras::Quick::Qt3DQuickWindow view;
++
++ qmlRegisterType<SceneHelper>("Qt3D.Examples", 2, 0, "SceneHelper");
++ view.setSource(QUrl("qrc:/main.qml"));
++ view.show();
++
++ return app.exec();
++ }
++
++ #include "main.moc"