| /**************************************************************************** |
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| ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). |
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| ** packaging of this file. Please review the following information to |
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| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
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| ** Public license version 3 or any later version approved by the KDE Free |
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| ****************************************************************************/ |
| |
| #ifndef QT3DCORE_QNODEVISITOR_P_H |
| #define QT3DCORE_QNODEVISITOR_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. |
| // |
| |
| #include <Qt3DCore/qentity.h> |
| #include <Qt3DCore/qnode.h> |
| #include <Qt3DCore/qt3dcore_global.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace Qt3DCore |
| { |
| |
| class Q_3DCORESHARED_EXPORT QNodeVisitor |
| { |
| public: |
| QNodeVisitor(); |
| virtual ~QNodeVisitor(); |
| |
| template<typename NodeVisitorFunc> |
| void traverse(QNode *rootNode_, NodeVisitorFunc fN) |
| { |
| startTraversing(rootNode_, createFunctor(fN)); |
| } |
| |
| template<typename Obj, typename NodeVisitorFunc> |
| void traverse(QNode *rootNode_, Obj *instance, NodeVisitorFunc fN) |
| { |
| startTraversing(rootNode_, createFunctor(instance, fN)); |
| } |
| |
| template<typename NodeVisitorFunc, typename EntityVisitorFunc> |
| void traverse(QNode *rootNode_, NodeVisitorFunc fN, EntityVisitorFunc fE) |
| { |
| startTraversing(rootNode_, createFunctor(fN), createFunctor(fE)); |
| } |
| |
| template<typename Obj, typename NodeVisitorFunc, typename EntityVisitorFunc> |
| void traverse(QNode *rootNode_, Obj *instance, NodeVisitorFunc fN, EntityVisitorFunc fE) |
| { |
| startTraversing(rootNode_, createFunctor(instance, fN), createFunctor(instance, fE)); |
| } |
| |
| QNode *rootNode() const; |
| QNode *currentNode() const; |
| void setPath(QNodeVector path); |
| QNodeVector path() const; |
| void append(QNode *n); |
| void pop_back(); |
| |
| private: |
| Q_DISABLE_COPY(QNodeVisitor) |
| QNodeVector m_path; |
| |
| template<typename NodeVisitorFunctor> |
| void startTraversing(QNode *rootNode_, NodeVisitorFunctor fN) |
| { |
| setPath(QNodeVector() << rootNode_); |
| if (rootNode_) |
| visitNode(rootNode_, fN); |
| } |
| |
| template<typename NodeVisitorFunctor, typename EntityVisitorFunctor> |
| void startTraversing(QNode *rootNode_, NodeVisitorFunctor fN, EntityVisitorFunctor fE) |
| { |
| setPath(QNodeVector() << rootNode_); |
| QEntity* rootEntity = qobject_cast<QEntity *>(rootNode_); |
| |
| if (rootEntity) |
| visitEntity(rootEntity, fN, fE); |
| else if (rootNode_) |
| visitNode(rootNode_, fN, fE); |
| } |
| |
| template<typename NodeVisitorFunctor> |
| void visitNode(QNode *nd, NodeVisitorFunctor &fN) |
| { |
| fN(nd); |
| traverseChildren(fN); |
| } |
| |
| template<typename NodeVisitorFunctor, typename EntityVisitorFunctor> |
| void visitNode(QNode *nd, NodeVisitorFunctor &fN, EntityVisitorFunctor &fE) |
| { |
| fN(nd); |
| traverseChildren(fN, fE); |
| } |
| |
| template<typename NodeVisitorFunctor, typename EntityVisitorFunctor> |
| void visitEntity(QEntity *ent, NodeVisitorFunctor &fN, EntityVisitorFunctor &fE) |
| { |
| fE(ent); |
| visitNode(ent, fN, fE); |
| } |
| |
| template<typename NodeVisitorFunctor, typename EntityVisitorFunctor> |
| void traverseChildren(NodeVisitorFunctor &fN, EntityVisitorFunctor &fE) |
| { |
| for (QObject *n : currentNode()->children()) { |
| QNode *node = qobject_cast<QNode *>(n); |
| if (node != nullptr) |
| outerVisitNode(node, fN, fE); |
| } // of children iteration |
| } |
| |
| template<typename NodeVisitorFunctor> |
| void traverseChildren(NodeVisitorFunctor &fN) |
| { |
| for (QObject *n : currentNode()->children()) { |
| QNode *node = qobject_cast<QNode *>(n); |
| if (node != nullptr) |
| outerVisitNode(node, fN); |
| } // of children iteration |
| } |
| |
| template<typename NodeVisitorFunctor, typename EntityVisitorFunctor> |
| void outerVisitNode(QNode *n, NodeVisitorFunctor &fN, EntityVisitorFunctor &fE) |
| { |
| append(n); |
| QEntity* e = qobject_cast<QEntity *>(n); |
| if (e) { |
| visitEntity(e, fN, fE); |
| } else { |
| visitNode(n, fN, fE); |
| } |
| pop_back(); |
| } |
| |
| template<typename NodeVisitorFunctor> |
| void outerVisitNode(QNode *n, NodeVisitorFunctor &fN) |
| { |
| append(n); |
| visitNode(n, fN); |
| pop_back(); |
| } |
| |
| template <typename ReturnType, typename NodeType> |
| class FunctionFunctor { |
| public: |
| typedef ReturnType (*functionPtr)(NodeType); |
| |
| FunctionFunctor(functionPtr fPtr) |
| : m_functionPointer(fPtr) |
| {} |
| |
| void operator()(NodeType node) |
| { |
| (*m_functionPointer)(node); |
| } |
| |
| private: |
| functionPtr m_functionPointer; |
| }; |
| |
| template <typename C, typename ReturnType, typename NodeType> |
| class MemberFunctionFunctor { |
| public: |
| typedef ReturnType (C::*functionPtr)(NodeType); |
| |
| MemberFunctionFunctor(C* instance, functionPtr fPtr) |
| : m_instance(instance) |
| , m_functionPointer(fPtr) |
| {} |
| |
| void operator()(NodeType node) |
| { |
| (*m_instance.*m_functionPointer)(node); |
| } |
| |
| private: |
| C *m_instance; |
| functionPtr m_functionPointer; |
| }; |
| |
| template <typename C, typename ReturnType, typename NodeType> |
| class ConstMemberFunctionFunctor { |
| public: |
| typedef ReturnType (C::*functionPtr)(NodeType) const; |
| |
| ConstMemberFunctionFunctor(C* instance, functionPtr fPtr) |
| : m_instance(instance) |
| , m_functionPointer(fPtr) |
| {} |
| |
| void operator()(NodeType node) const |
| { |
| (*m_instance.*m_functionPointer)(node); |
| } |
| |
| private: |
| C *m_instance; |
| functionPtr m_functionPointer; |
| }; |
| |
| template <typename T> |
| const T& createFunctor(const T& t) |
| { |
| return t; |
| } |
| |
| template <typename ReturnType, typename NodeType> |
| FunctionFunctor<ReturnType, NodeType> createFunctor(ReturnType (*fPtr)(NodeType)) |
| { |
| return FunctionFunctor<ReturnType, NodeType>(fPtr); |
| } |
| |
| template <typename C, typename ReturnType, typename NodeType> |
| MemberFunctionFunctor<C, ReturnType, NodeType> createFunctor(C *instance, ReturnType (C::*fPtr)(NodeType)) |
| { |
| return MemberFunctionFunctor<C, ReturnType, NodeType>(instance, fPtr); |
| } |
| |
| template <typename C, typename ReturnType, typename NodeType> |
| ConstMemberFunctionFunctor<C, ReturnType, NodeType> createFunctor(C *instance, ReturnType (C::*fPtr)(NodeType) const) |
| { |
| return ConstMemberFunctionFunctor<C, ReturnType, NodeType>(instance, fPtr); |
| } |
| }; |
| |
| } // namespace Qt3DCore |
| |
| QT_END_NAMESPACE |
| |
| #endif // QT3DCORE_QNODEVISITOR_P_H |