/* | |
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* | |
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* modification, are permitted provided that the following conditions | |
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* | |
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
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*/ | |
#ifndef PositionIterator_h | |
#define PositionIterator_h | |
#include "Node.h" | |
#include "Position.h" | |
namespace WebCore { | |
// A Position iterator with constant-time | |
// increment, decrement, and several predicates on the Position it is at. | |
// Conversion to/from Position is O(n) in the offset. | |
class PositionIterator { | |
public: | |
PositionIterator() | |
: m_anchorNode(0) | |
, m_nodeAfterPositionInAnchor(0) | |
, m_offsetInAnchor(0) | |
{ | |
} | |
PositionIterator(const Position& pos) | |
: m_anchorNode(pos.anchorNode()) | |
, m_nodeAfterPositionInAnchor(m_anchorNode->childNode(pos.deprecatedEditingOffset())) | |
, m_offsetInAnchor(m_nodeAfterPositionInAnchor ? 0 : pos.deprecatedEditingOffset()) | |
{ | |
} | |
operator Position() const; | |
void increment(); | |
void decrement(); | |
Node* node() const { return m_anchorNode; } | |
int offsetInLeafNode() const { return m_offsetInAnchor; } | |
bool atStart() const; | |
bool atEnd() const; | |
bool atStartOfNode() const; | |
bool atEndOfNode() const; | |
bool isCandidate() const; | |
private: | |
Node* m_anchorNode; | |
Node* m_nodeAfterPositionInAnchor; // If this is non-null, m_nodeAfterPositionInAnchor->parentNode() == m_anchorNode; | |
int m_offsetInAnchor; | |
}; | |
} // namespace WebCore | |
#endif // PositionIterator_h |