Toshihiro Shimizu 890ddd
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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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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  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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    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 override {
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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 { return (int)m_undos.size(); }
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  void setLast() {
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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 override {
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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 override {
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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() override {}
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  void add(TUndo *undo) {
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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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    if (n == -1) n = m_undos.size();
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    if (m_undos.empty() || n <= 0) 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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  QString getHistoryString() override {
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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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  int getHistoryType() override {
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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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  std::vector<tundoblock *=""> m_blockStack;</tundoblock>
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public:
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  TUndoManagerImp() : m_skipped(false), m_undoMemorySize(0) {
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    m_current = m_undoList.end();
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  }
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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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      if (m_ptr) 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
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    TUndoManager::TUndoManagerImp::theManager;
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//-----------------------------------------------------------------------------
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TUndoManager *TUndoManager::manager() {
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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() : m_imp(new TUndoManagerImp) {}
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//-----------------------------------------------------------------------------
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TUndoManager::~TUndoManager() {
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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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  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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  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++) memorySize += m_undoList[i]->getSize();
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  while (
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      count > 100 ||
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      (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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  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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  // 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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  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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  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() { m_imp->m_skipped = true; }
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//-----------------------------------------------------------------------------
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void TUndoManager::setUndoMemorySize(int memorySyze) {
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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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  assert(undo);
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  if (!undo) 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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  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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  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) ++n;
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      }
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      if (m_imp->m_undoList.empty() || n <= 0) return;
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      if (m_imp->m_current == m_imp->m_undoList.end()) {
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        int i;
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        for (i = 0; i < n && m_imp->m_current != m_imp->m_undoList.begin();
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             i++) {
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          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()) return;
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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) 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()) return;
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  if (m_imp->m_blockStack.empty()) {
Shinya Kitaoka 120a6e
    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);
Toshihiro Shimizu 890ddd
}
Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
//-----------------------------------------------------------------------------
Toshihiro Shimizu 890ddd
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int TUndoManager::getHistoryCount() { return (int)m_imp->m_undoList.size(); }
Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
//-----------------------------------------------------------------------------
Toshihiro Shimizu 890ddd
Shinya Kitaoka 120a6e
int TUndoManager::getCurrentHistoryIndex() {
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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) return index;
Shinya Kitaoka 120a6e
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    if (it == m_imp->m_undoList.end()) break;
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    index++;
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    it++;
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  }
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  return 0;
Toshihiro Shimizu 890ddd
}
Toshihiro Shimizu 890ddd
Toshihiro Shimizu 890ddd
//-----------------------------------------------------------------------------
Toshihiro Shimizu 890ddd
Shinya Kitaoka 120a6e
TUndo *TUndoManager::getUndoItem(int index) {
Shinya Kitaoka 120a6e
  if (index > (int)m_imp->m_undoList.size() || index <= 0) return 0;
Toshihiro Shimizu 890ddd
Shinya Kitaoka 120a6e
  return m_imp->m_undoList.at(index - 1);
Toshihiro Shimizu 890ddd
}