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/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DRAGONNODETREE_P_H
#define DRAGONNODETREE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Dragon {
/*!
* Qt3D passes very limited information to the backend about the child/parent hierarchy.
* Only parent information is passed on creation and only child information is passed in updates.
* The nodeTree tries its best to use information from the different
* NodeFunctors (a.k.a. QBackendNodeMappers) to construct a usable tree.
*
* TODO: Make Qt3D pass the parent id to the backend when parent changes and/or
* children on node creation.
*/
class NodeTree
{
public:
struct NodeInfo
{
Qt3DCore::QNodeId parentId;
QVector<Qt3DCore::QNodeId> childIds;
};
using Nodes = QHash<Qt3DCore::QNodeId, NodeInfo>;
void addNode(Qt3DCore::QNodeId id)
{
// node might already exist if setParent or addChild was called first
if (!m_nodes.contains(id))
m_nodes.insert(id, NodeInfo());
}
void removeNode(Qt3DCore::QNodeId id)
{
// this is mostly to clear the data in case the node appears again
NodeInfo node = m_nodes.take(id);
if (!node.parentId.isNull())
m_nodes[node.parentId].childIds.removeOne(id);
}
void setParent(Qt3DCore::QNodeId childId, Qt3DCore::QNodeId parentId)
{
// remove child from old parent
if (m_nodes.contains(childId)) {
Qt3DCore::QNodeId oldParentId = m_nodes[childId].parentId;
if (m_nodes.contains(oldParentId)) {
m_nodes[oldParentId].childIds.removeOne(childId);
}
}
// using operator[] here on purpose - we want to set it even if addNode has not been called
m_nodes[childId].parentId = parentId;
if (!parentId.isNull() && !m_nodes[parentId].childIds.contains(childId))
m_nodes[parentId].childIds.push_back(childId);
}
const QHash<Qt3DCore::QNodeId, NodeInfo> &nodes()
{
return m_nodes;
}
// Task interface
QHash<Qt3DCore::QNodeId, NodeInfo> result()
{
return m_nodes;
}
bool isFinished()
{
return true;
}
private:
QHash<Qt3DCore::QNodeId, NodeInfo> m_nodes;
};
} // namespace Dragon
} // namespace Qt3DRender
QT_END_NAMESPACE
#endif // DRAGONNODETREE_P_H
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