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/* This file is part of the KDE project.
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef OBJECTTREE_H
#define OBJECTTREE_H
#include <QObject>
#include <QStack>
QT_BEGIN_NAMESPACE
namespace ObjectTree
{
/**
* Depth-first iterator for QObject tree
*/
class DepthFirstConstIterator
{
public:
DepthFirstConstIterator();
DepthFirstConstIterator(const QObject& root);
DepthFirstConstIterator& operator++();
inline bool operator==(const DepthFirstConstIterator& other) const
{ return other.m_pointee == m_pointee; }
inline bool operator!=(const DepthFirstConstIterator& other) const
{ return other.m_pointee != m_pointee; }
inline const QObject* operator->() const { return m_pointee; }
inline const QObject& operator*() const { return *m_pointee; }
private:
void backtrack();
private:
const QObject* m_pointee;
QStack<int> m_history;
};
/**
* Ancestor iterator for QObject tree
*/
class AncestorConstIterator
{
public:
AncestorConstIterator();
AncestorConstIterator(const QObject& root);
inline AncestorConstIterator& operator++()
{ m_ancestors.pop(); return *this; }
inline bool operator==(const AncestorConstIterator& other) const
{ return other.m_ancestors == m_ancestors; }
inline bool operator!=(const AncestorConstIterator& other) const
{ return other.m_ancestors != m_ancestors; }
inline const QObject* operator->() const { return m_ancestors.top(); }
inline const QObject& operator*() const { return *m_ancestors.top(); }
private:
QStack<const QObject*> m_ancestors;
};
/**
* Generic algorithm for visiting nodes in an object tree. Nodes in the
* tree are visited in a const context, therefore they are not modified
* by this algorithm.
*
* Visitor must provide functions with the following signatures:
*
* Called before visit begins
* void visitPrepare()
*
* Called on each node visited
* void visitNode(const QObject& object)
*
* Called when visit is complete
* void visitComplete()
*/
template <class Iterator, class Visitor>
void visit(Iterator begin, Iterator end, Visitor& visitor)
{
visitor.visitPrepare();
for ( ; begin != end; ++begin)
visitor.visitNode(*begin);
visitor.visitComplete();
}
} // namespace ObjectTree
QT_END_NAMESPACE
#endif // OBJECTTREE_H
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