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// Copyright (C) 2019 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 "entityaccumulator_p.h"
#include "entityvisitor_p.h"
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
namespace {
class Accumulator : public EntityVisitor
{
public:
Accumulator(std::function<bool(Entity *)> predicate, NodeManagers *manager)
: EntityVisitor(manager)
, m_predicate(predicate)
{
}
EntityVisitor::Operation visit(Entity *entity) override {
if (m_predicate(entity))
m_entities << entity;
return Continue;
}
QList<Entity *> m_entities;
private:
std::function<bool(Entity *)> m_predicate;
};
}
EntityAccumulator::EntityAccumulator(NodeManagers *manager)
: m_manager(manager)
, m_predicate([](Entity*) { return true; })
{
}
EntityAccumulator::EntityAccumulator(std::function<bool (Entity *)> predicate, NodeManagers *manager)
: m_manager(manager)
, m_predicate(predicate)
{
}
/*!
* \internal
*
* Call this to traverse the scene graph and return all entities for
* which the predicate returns true.
*
* Can be useful to get all the entities that contain a specific type
* of component.
*/
QList<Entity *> EntityAccumulator::apply(Entity *root) const
{
Accumulator a(m_predicate, m_manager);
a.apply(root);
return a.m_entities;
}
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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