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Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
#include "tundo.h"
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#include <deque></deque>
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//-----------------------------------------------------------------------------
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using std::for_each;
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namespace
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{
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void deleteUndo(const TUndo *undo) { delete undo; }
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void callUndo(const TUndo *undo) { undo->undo(); }
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void callRedo(const TUndo *undo) { undo->redo(); }
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// void callRepeat(const TUndo* undo) {undo->repeat(); }
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class TUndoBlock : public TUndo
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{
Shinya Kitaoka 3bfa54
	std::vector<tundo *=""> m_undos;</tundo>
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	typedef std::vector<tundo *="">::const_iterator Iterator;</tundo>
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	typedef std::vector<tundo *="">::const_reverse_iterator ReverseIterator;</tundo>
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	mutable bool m_deleted, m_undoing;
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public:
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	TUndoBlock() : m_deleted(false), m_undoing(false) {}
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	~TUndoBlock()
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	{
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		assert(m_undoing == false);
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		assert(m_deleted == false);
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		m_deleted = true;
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		for_each(m_undos.begin(), m_undos.end(), deleteUndo);
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		m_undos.clear();
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	}
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	int getSize() const
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	{
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		int size = sizeof(*this);
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		for (Iterator cit = m_undos.begin(); cit != m_undos.end(); ++cit)
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			size += (*cit)->getSize();
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		size += (m_undos.capacity() - m_undos.size()) * sizeof(TUndo *);
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		return size;
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	}
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	int getUndoCount() const
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	{
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		return (int)m_undos.size();
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	}
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	void setLast()
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	{
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		for (UINT i = 1; i < m_undos.size(); i++)
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			m_undos[i]->m_isLastInBlock = false;
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		m_undos[0]->m_isLastInBlock = true;
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	}
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	void undo() const
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	{
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		assert(!m_deleted);
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		assert(!m_undoing);
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		m_undoing = true;
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		//VERSIONE CORRETTA
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		for_each(m_undos.rbegin(), m_undos.rend(), callUndo);
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		//VERSIONE SBAGLIATA
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		//for_each(m_undos.begin(), m_undos.end(), callUndo);
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		m_undoing = false;
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	}
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	void redo() const
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	{
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		assert(!m_deleted);
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		//VERSIONE CORRETTA
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		for_each(m_undos.begin(), m_undos.end(), callRedo);
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		//VERSIONE SBAGLIATA
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		//for_each(m_undos.rbegin(), m_undos.rend(), callRedo);
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	}
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	//void repeat() const {
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	//  for_each(m_undos.begin(), m_undos.end(), callRepeat);
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	//}
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	void onAdd() {}
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	void add(TUndo *undo)
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	{
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		undo->m_isLastInBlock = true;
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		m_undos.push_back(undo);
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	}
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	void popUndo(int n)
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	{
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		if (n == -1)
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			n = m_undos.size();
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		if (m_undos.empty() || n <= 0)
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			return;
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		while (n > 0 && !m_undos.empty()) {
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			TUndo *undo = m_undos.back();
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			m_undos.pop_back();
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			delete undo;
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			n--;
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		}
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	}
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	virtual QString getHistoryString()
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	{
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		if (m_undos.empty())
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			return TUndo::getHistoryString();
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		else if ((int)m_undos.size() == 1)
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			return m_undos.back()->getHistoryString();
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		else {
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			return QString("%1  etc..").arg(m_undos.back()->getHistoryString());
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		}
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	}
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	virtual int getHistoryType()
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	{
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		if (m_undos.empty())
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			return TUndo::getHistoryType();
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		else
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			return m_undos.back()->getHistoryType();
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	}
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};
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}
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typedef std::deque<tundo *=""> UndoList;</tundo>
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typedef UndoList::iterator UndoListIterator;
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typedef UndoList::const_iterator UndoListConstIterator;
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//-----------------------------------------------------------------------------
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struct TUndoManager::TUndoManagerImp {
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	UndoList m_undoList;
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	UndoListIterator m_current;
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	bool m_skipped;
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	int m_undoMemorySize; // in bytes
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Shinya Kitaoka 3bfa54
	std::vector<tundoblock *=""> m_blockStack;</tundoblock>
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public:
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	TUndoManagerImp() : m_skipped(false), m_undoMemorySize(0) { m_current = m_undoList.end(); }
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	~TUndoManagerImp() {}
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	void add(TUndo *undo);
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public:
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	static struct ManagerPtr {
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		TUndoManager *m_ptr;
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	public:
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		ManagerPtr() : m_ptr(0) {}
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		~ManagerPtr()
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		{
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			if (m_ptr)
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				delete m_ptr;
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			m_ptr = 0;
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		}
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	} theManager;
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private:
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	void doAdd(TUndo *undo);
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};
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//=============================================================================
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TUndoManager::TUndoManagerImp::ManagerPtr TUndoManager::TUndoManagerImp::theManager;
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//-----------------------------------------------------------------------------
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TUndoManager *TUndoManager::manager()
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{
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	if (!TUndoManagerImp::theManager.m_ptr)
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		TUndoManagerImp::theManager.m_ptr = new TUndoManager;
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	return TUndoManagerImp::theManager.m_ptr;
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}
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//=============================================================================
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TUndoManager::TUndoManager()
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	: m_imp(new TUndoManagerImp)
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{
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}
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//-----------------------------------------------------------------------------
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TUndoManager::~TUndoManager()
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{
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	//cout << "Distrutto undo manager" << endl;
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	assert(m_imp->m_blockStack.empty());
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	reset();
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::TUndoManagerImp::add(TUndo *undo)
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{
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	assert(undo);
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	if (!m_blockStack.empty()) {
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		assert(m_current == m_undoList.end());
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		m_blockStack.back()->add(undo);
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	} else
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		doAdd(undo);
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::TUndoManagerImp::doAdd(TUndo *undo)
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{
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	if (m_current != m_undoList.end()) {
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		for_each(m_current, m_undoList.end(), deleteUndo);
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		m_undoList.erase(m_current, m_undoList.end());
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	}
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	int i, memorySize = 0, count = m_undoList.size();
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	for (i = 0; i < count; i++)
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		memorySize += m_undoList[i]->getSize();
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	while (count > 100 || (count != 0 && memorySize + undo->getSize() > m_undoMemorySize)) //20MB
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	{
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		--count;
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		TUndo *undo = m_undoList.front();
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		m_undoList.pop_front();
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		memorySize -= undo->getSize();
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		delete undo;
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	}
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	undo->m_isLastInBlock = true;
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	m_undoList.push_back(undo);
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	m_current = m_undoList.end();
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::beginBlock()
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{
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	if (m_imp->m_current != m_imp->m_undoList.end()) {
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		for_each(m_imp->m_current, m_imp->m_undoList.end(), deleteUndo);
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		m_imp->m_undoList.erase(m_imp->m_current, m_imp->m_undoList.end());
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	}
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	TUndoBlock *undoBlock = new TUndoBlock;
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	m_imp->m_blockStack.push_back(undoBlock);
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	m_imp->m_current = m_imp->m_undoList.end();
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::endBlock()
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{
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	//vogliamo fare anche resize del vector ???
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	assert(m_imp->m_blockStack.empty() == false);
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	TUndoBlock *undoBlock = m_imp->m_blockStack.back();
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	m_imp->m_blockStack.pop_back();
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	if (undoBlock->getUndoCount() > 0) {
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		undoBlock->setLast();
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		m_imp->add(undoBlock);
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		emit historyChanged();
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	} else {
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		delete undoBlock;
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		m_imp->m_current = m_imp->m_undoList.end();
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	}
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}
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//-----------------------------------------------------------------------------
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bool TUndoManager::undo()
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{
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	assert(m_imp->m_blockStack.empty());
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	UndoListIterator &it = m_imp->m_current;
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	if (it != m_imp->m_undoList.begin()) {
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		m_imp->m_skipped = false;
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		--it;
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		(*it)->undo();
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		emit historyChanged();
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		if (m_imp->m_skipped) {
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			m_imp->m_skipped = false;
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			return undo();
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		}
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		return true;
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	} else
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		return false;
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}
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//-----------------------------------------------------------------------------
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bool TUndoManager::redo()
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{
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	assert(m_imp->m_blockStack.empty());
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	UndoListIterator &it = m_imp->m_current;
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	if (it != m_imp->m_undoList.end()) {
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		m_imp->m_skipped = false;
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		(*it)->redo();
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		++it;
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		emit historyChanged();
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		if (m_imp->m_skipped) {
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			m_imp->m_skipped = false;
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			return redo();
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		}
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		return true;
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	} else
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		return false;
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}
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//-----------------------------------------------------------------------------
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//repeat e' come redo ma non sposta il puntatore al corrente
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/*
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void TUndoManager::repeat()
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{
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  assert(m_imp->m_blockStack.empty());
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  UndoListIterator &it = m_imp->m_current;
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  if (it != m_imp->m_undoList.end())
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  {
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    (*it)->repeat();
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  }
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}
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*/
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//-----------------------------------------------------------------------------
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void TUndoManager::skip()
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{
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	m_imp->m_skipped = true;
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::setUndoMemorySize(int memorySyze)
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{
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	m_imp->m_undoMemorySize = 1048576 * memorySyze;
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::add(TUndo *undo)
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{
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	assert(undo);
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	if (!undo)
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		return;
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	m_imp->add(undo);
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	Q_EMIT historyChanged();
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	undo->onAdd();
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	Q_EMIT somethingChanged();
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::reset()
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{
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	assert(m_imp->m_blockStack.empty());
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	m_imp->m_blockStack.clear();
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	UndoList &lst = m_imp->m_undoList;
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	for_each(lst.begin(), lst.end(), deleteUndo);
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	lst.clear();
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	m_imp->m_current = m_imp->m_undoList.end();
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	Q_EMIT historyChanged();
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}
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//-----------------------------------------------------------------------------
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void TUndoManager::popUndo(int n, bool forward)
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{
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	if (!forward) {
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		if (m_imp->m_blockStack.empty()) {
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			if (n == -1) {
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				UndoListIterator start = m_imp->m_undoList.begin();
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				n = 0;
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				while (start != m_imp->m_current)
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					++n;
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			}
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			if (m_imp->m_undoList.empty() || n <= 0)
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				return;
Toshihiro Shimizu 890ddd
			if (m_imp->m_current == m_imp->m_undoList.end()) {
Toshihiro Shimizu 890ddd
				int i;
Toshihiro Shimizu 890ddd
				for (i = 0; i < n && m_imp->m_current != m_imp->m_undoList.begin(); i++) {
Toshihiro Shimizu 890ddd
					m_imp->m_current--;
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					delete (*m_imp->m_current);
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					m_imp->m_undoList.erase(m_imp->m_current);
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					m_imp->m_current = m_imp->m_undoList.end();
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				}
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			} else {
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				TUndo *undo = *m_imp->m_current;
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				UndoListIterator start, end = m_imp->m_current;
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				if (end == m_imp->m_undoList.begin())
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					return;
Toshihiro Shimizu 890ddd
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				int i;
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				for (i = 0; i < n && m_imp->m_current != m_imp->m_undoList.begin(); i++)
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					m_imp->m_current--;
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				start = m_imp->m_current;
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				UndoListIterator _end = end;
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				while (_end != start) {
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					_end--;
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					delete (*_end);
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				}
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				m_imp->m_undoList.erase(start, end);
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				m_imp->m_current = m_imp->m_undoList.begin();
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				while (*m_imp->m_current != undo)
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					m_imp->m_current++;
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			}
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		} else
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			m_imp->m_blockStack.back()->popUndo(n);
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		return;
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	}
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	if (m_imp->m_current == m_imp->m_undoList.end())
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		return;
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	if (m_imp->m_blockStack.empty()) {
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		UndoListIterator end, start = m_imp->m_current++;
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		if (n == -1)
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			end = m_imp->m_undoList.end();
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		else {
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			UndoListIterator it = start;
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			end = it;
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			int i = 0;
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			while (i != n && end != m_imp->m_undoList.end()) {
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				++end;
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				i++;
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			}
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		}
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		for_each(start, end, deleteUndo);
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		m_imp->m_undoList.erase(start, end);
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		m_imp->m_current = m_imp->m_undoList.end();
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	} else
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		m_imp->m_blockStack.back()->popUndo(n);
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}
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//-----------------------------------------------------------------------------
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int TUndoManager::getHistoryCount()
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{
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	return (int)m_imp->m_undoList.size();
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}
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//-----------------------------------------------------------------------------
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int TUndoManager::getCurrentHistoryIndex()
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{
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	int index = 0;
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	UndoListIterator it = m_imp->m_undoList.begin();
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	while (1) {
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		if (it == m_imp->m_current)
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			return index;
Toshihiro Shimizu 890ddd
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		if (it == m_imp->m_undoList.end())
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			break;
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		index++;
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		it++;
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	}
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	return 0;
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}
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Toshihiro Shimizu 890ddd
//-----------------------------------------------------------------------------
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Toshihiro Shimizu 890ddd
TUndo *TUndoManager::getUndoItem(int index)
Toshihiro Shimizu 890ddd
{
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	if (index > (int)m_imp->m_undoList.size() || index <= 0)
Toshihiro Shimizu 890ddd
		return 0;
Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
	return m_imp->m_undoList.at(index - 1);
Toshihiro Shimizu 890ddd
}