#include "toonzqt/functionselection.h"

#include "toonzqt/dvdialog.h"

// TnzLib includes

#include "toonz/doubleparamcmd.h"

#include "toonz/tframehandle.h"

#include "toonz/txsheetexpr.h"

// TnzBase includes

#include "tdoubleparam.h"

#include "tdoublekeyframe.h"

#include "texpression.h"

// TnzCore includes

#include "tcommon.h"

#include "tundo.h"

// Qt includes

#include <qapplication></qapplication>

#include <qmimedata></qmimedata>

#include <qclipboard></qclipboard>

//=============================================================================

//

// Function clipboard operations undo

//

//-----------------------------------------------------------------------------

class KeyframesCopyUndo : public TUndo {

  QMimeData *m_oldData, *m_newData;

public:

  KeyframesCopyUndo(const QMimeData *oldData, const QMimeData *newData)

      : m_oldData(cloneData(oldData)), m_newData(cloneData(newData)) {}

  ~KeyframesCopyUndo() {

    delete m_oldData;

    delete m_newData;

  }

  void undo() const override {

    QApplication::clipboard()->setMimeData(cloneData(m_oldData));

  }

  void redo() const override {

    QApplication::clipboard()->setMimeData(cloneData(m_newData));

  }

  int getSize() const override {

    return sizeof(*this) + sizeof(QMimeData) * 2;  // approx

  }

  QString getHistoryString() override { return QObject::tr("Copy Keyframe"); }

};

//-----------------------------------------------------------------------------

class KeyframesPasteUndo : public TUndo {

  struct Column {

    TDoubleParam *m_param;

    std::map<int, tdoublekeyframe=""> m_oldKeyframes;</int,>

    std::set<double> m_created;</double>

  };

  std::vector<column> m_columns;</column>

  FunctionKeyframesData *m_data;

  double m_frame;

public:

  KeyframesPasteUndo(std::vector<tdoubleparam *=""> ¶ms,</tdoubleparam>

                     const FunctionKeyframesData *data, double frame)

      : m_data(dynamic_cast<functionkeyframesdata *="">(data->clone()))</functionkeyframesdata>

      , m_frame(frame) {

    assert((int)params.size() <= data->getColumnCount());

    int columnCount = std::min((int)(params.size()), data->getColumnCount());

    m_columns.resize(columnCount);

    for (int col = 0; col < columnCount; col++) {

      TDoubleParam *param    = params[col];

      m_columns[col].m_param = param;

      param->addRef();

      const FunctionKeyframesData::Keyframes &keyframes =

          data->getKeyframes(col);

      FunctionKeyframesData::Keyframes::const_iterator it;

      for (it = keyframes.begin(); it != keyframes.end(); ++it) {

        double f = it->m_frame + frame;

        int k    = param->getClosestKeyframe(f);

        if (0 <= k && k < param->getKeyframeCount() &&

            param->keyframeIndexToFrame(k) == f)

          m_columns[col].m_oldKeyframes[k] = param->getKeyframe(k);

        else

          m_columns[col].m_created.insert(f);

      }

    }

  }

  ~KeyframesPasteUndo() {

    for (int i = 0; i < (int)m_columns.size(); i++)

      m_columns[i].m_param->release();

    delete m_data;

  }

  void undo() const override {

    int columnCount = (int)m_columns.size();

    for (int col = 0; col < columnCount; col++) {

      TDoubleParam *param = m_columns[col].m_param;

      for (std::set<double>::const_iterator it =</double>

               m_columns[col].m_created.begin();

           it != m_columns[col].m_created.end(); ++it)

        param->deleteKeyframe(*it);

      param->setKeyframes(m_columns[col].m_oldKeyframes);

    }

  }

  void redo() const override {

    for (int col = 0; col < (int)m_columns.size(); col++) {

      m_data->setData(col, m_columns[col].m_param, m_frame);

    }

  }

  int getSize() const override {

    return sizeof(*this) + 100;  // approx

  }

  QString getHistoryString() override {

    return QObject::tr("Paste Keyframe  at Frame : %1")

        .arg(QString::number((int)m_frame + 1));

  }

};

//-----------------------------------------------------------------------------

class KeyframesDeleteUndo : public TUndo {

public:

  struct ColumnKeyframes {

    TDoubleParam *m_param;

    std::vector<tdoublekeyframe> m_keyframes;</tdoublekeyframe>

  };

  struct Column {

    TDoubleParam *m_param;

    QSet<int> m_keyframes;</int>

  };

  KeyframesDeleteUndo(const std::vector<column> &columns) {</column>

    m_columns.resize(columns.size());

    for (int col = 0; col < (int)m_columns.size(); col++) {

      TDoubleParam *param    = columns[col].m_param;

      m_columns[col].m_param = param;

      if (!param) continue;

      param->addRef();

      const QSet<int> &keyframes = columns[col].m_keyframes;</int>

      for (QSet<int>::const_iterator it = keyframes.begin();</int>

           it != keyframes.end(); ++it)

        m_columns[col].m_keyframes.push_back(param->getKeyframe(*it));

    }

  }

  ~KeyframesDeleteUndo() {

    for (int col = 0; col < (int)m_columns.size(); col++)

      m_columns[col].m_param->release();

  }

  void undo() const override {

    for (int col = 0; col < (int)m_columns.size(); col++)

      for (int i = 0; i < (int)m_columns[col].m_keyframes.size(); i++)

        m_columns[col].m_param->setKeyframe(m_columns[col].m_keyframes[i]);

  }

  void redo() const override {

    for (int col = 0; col < (int)m_columns.size(); col++)

      for (int i = 0; i < (int)m_columns[col].m_keyframes.size(); i++)

        m_columns[col].m_param->deleteKeyframe(

            m_columns[col].m_keyframes[i].m_frame);

  }

  int getSize() const override {

    return sizeof(*this) +

           sizeof(TDoubleKeyframe) * m_columns.size();  // sbagliato!

  }

  QString getHistoryString() override { return QObject::tr("Delete Keyframe"); }

private:

  std::vector<columnkeyframes> m_columns;</columnkeyframes>

};

//-----------------------------------------------------------------------------

class KeyframesMoveUndo : public TUndo {

public:

  KeyframesMoveUndo() {}

  ~KeyframesMoveUndo() {

    for (int i = 0; i < (int)m_movements.size(); i++)

      m_movements[i].m_param->release();

    m_movements.clear();

  }

  void addMovement(TDoubleParam *param, int kIndex, double frameDelta) {

    m_movements.push_back(KeyframeMovement(param, kIndex, frameDelta));

    param->addRef();

  }

  void undo() const override {

    for (int i = (int)m_movements.size() - 1; i >= 0; i--) {

      TDoubleKeyframe kf =

          m_movements[i].m_param->getKeyframe(m_movements[i].m_kIndex);

      kf.m_frame -= m_movements[i].m_frameDelta;

      m_movements[i].m_param->setKeyframe(m_movements[i].m_kIndex, kf);

    }

  }

  void redo() const override {

    for (int i = 0; i < (int)m_movements.size(); i++) {

      TDoubleKeyframe kf =

          m_movements[i].m_param->getKeyframe(m_movements[i].m_kIndex);

      kf.m_frame += m_movements[i].m_frameDelta;

      m_movements[i].m_param->setKeyframe(m_movements[i].m_kIndex, kf);

    }

  }

  int getSize() const override {

    return sizeof(*this) + sizeof(m_movements[0]) * m_movements.size();

  }

  int getCount() const { return (int)m_movements.size(); }

  QString getHistoryString() override { return QObject::tr("Move Keyframe"); }

private:

  struct KeyframeMovement {

    TDoubleParam *m_param;

    int m_kIndex;

    double m_frameDelta;

    KeyframeMovement(TDoubleParam *param, int kIndex, double frameDelta)

        : m_param(param), m_kIndex(kIndex), m_frameDelta(frameDelta) {}

  };

  std::vector<keyframemovement> m_movements;</keyframemovement>

};

//=============================================================================

//

// FunctionSelection

//

//-----------------------------------------------------------------------------

FunctionSelection::FunctionSelection()

    : m_selectedCells()

    , m_selectedKeyframes()

    , m_selectedSegment(-1)

    , m_frameHandle(0)

    , m_columnToCurveMapper(0) {}

FunctionSelection::~FunctionSelection() {

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    if (m_selectedKeyframes[i].first) m_selectedKeyframes[i].first->release();

  m_selectedKeyframes.clear();

  delete m_columnToCurveMapper;

}

void FunctionSelection::setColumnToCurveMapper(ColumnToCurveMapper *mapper) {

  if (mapper != m_columnToCurveMapper) {

    delete m_columnToCurveMapper;

    m_columnToCurveMapper = mapper;

  }

}

void FunctionSelection::selectCurve(TDoubleParam *curve) {

  if (m_selectedKeyframes.size() == 1 && m_selectedKeyframes[0].first == curve)

    return;

  curve->addRef();

  deselectAllKeyframes();

  m_selectedKeyframes.push_back(qMakePair(curve, QSet<int>()));</int>

  m_selectedCells = QRect();

}

void FunctionSelection::deselectAllKeyframes() {

  if (getSelectedKeyframeCount() == 0) return;

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    m_selectedKeyframes[i].second.clear();

  emit selectionChanged();

}

int FunctionSelection::getCurveIndex(TDoubleParam *curve) const {

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    if (m_selectedKeyframes[i].first == curve) return i;

  return -1;

}

int FunctionSelection::touchCurveIndex(TDoubleParam *curve) {

  int i = getCurveIndex(curve);

  if (i < 0) {

    i = m_selectedKeyframes.size();

    m_selectedKeyframes.push_back(qMakePair(curve, QSet<int>()));</int>

    curve->addRef();

  }

  return i;

}

void FunctionSelection::selectNone() {

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    if (m_selectedKeyframes[i].first) m_selectedKeyframes[i].first->release();

  m_selectedKeyframes.clear();

  m_selectedSegment = -1;

  m_selectedCells   = QRect();

  emit selectionChanged();

}

// called from FunctionSheet::selectCells

void FunctionSelection::selectCells(const QRect &selectedCells,

                                    const QList<tdoubleparam *=""> &curves) {</tdoubleparam>

  assert(selectedCells.width() == curves.size());

  for (int i = 0; i < curves.size(); i++)

    if (curves[i]) curves[i]->addRef();

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    if (m_selectedKeyframes[i].first) m_selectedKeyframes[i].first->release();

  m_selectedKeyframes.clear();

  double r0 = selectedCells.top();

  double r1 = selectedCells.bottom();

  // Update selected keyframes

  for (int i = 0; i < curves.size(); i++) {

    TDoubleParam *curve = curves[i];

    m_selectedKeyframes.push_back(qMakePair(curve, QSet<int>()));</int>

    if (curve)

      for (int j = 0; j < curve->getKeyframeCount(); j++) {

        double f = curve->keyframeIndexToFrame(j);

        if (r0 <= f && f <= r1) m_selectedKeyframes[i].second.insert(j);

      }

  }

  // Update selected segment

  if (curves.size() != 1)

    m_selectedSegment = -1;

  else if (!curves[0])  // curves[0] may be zero

    m_selectedSegment = -1;

  else {

    int r0 = selectedCells.top();

    int r1 = selectedCells.bottom();

    int k0 = curves[0]->getPrevKeyframe(r0);

    int k1 = curves[0]->getPrevKeyframe(r1);

    // PrevKeyFrame does NOT include itself if the specified row is keyframe

    if (k0 ==

        curves[0]->getKeyframeCount() - 1)  // select bottom of the segments

      m_selectedSegment = -1;

    else if (k0 != k1)  // select over a keyframe

    {

      // then select the segment on top in the selection

      if (curves[0]->isKeyframe(r0))

        m_selectedSegment = k0 + 1;

      else

        m_selectedSegment = k0;

    } else  // select single segment

      m_selectedSegment = k0;

  }

  m_selectedCells = selectedCells;

  makeCurrent();

  emit selectionChanged();

}

void FunctionSelection::selectCells(const QRect &selectedCells) {

  QList<tdoubleparam *=""> curves;</tdoubleparam>

  for (int c = selectedCells.left(); c <= selectedCells.right(); c++)

    curves.append(getCurveFromColumn(c));

  selectCells(selectedCells, curves);

}

void FunctionSelection::select(TDoubleParam *curve, int k) {

  int i = touchCurveIndex(curve);

  m_selectedKeyframes[i].second.insert(k);

  double row = curve->keyframeIndexToFrame(k);

  if (row < (double)m_selectedCells.top()) m_selectedCells.setTop(floor(row));

  if (row > (double)m_selectedCells.bottom())

    m_selectedCells.setBottom(ceil(row));

  if (m_selectedSegment >= 0  // if a segment is selected

      && (m_selectedKeyframes.size() !=

              1  // and there is not a single curve selected

          || m_selectedSegment != k ||

          m_selectedSegment + 1 != k))  // or the new selected keyframe

                                        // is not a selected segment end

    m_selectedSegment = -1;             // then clear the segment selection

  makeCurrent();

  emit selectionChanged();

  m_selectedCells = QRect();

}

bool FunctionSelection::isSelected(TDoubleParam *curve, int k) const {

  int i = getCurveIndex(curve);

  if (i < 0)

    return false;

  else

    return m_selectedKeyframes[i].second.contains(k);

}

int FunctionSelection::getSelectedKeyframeCount() const {

  int count = 0;

  for (int i = 0; i < m_selectedKeyframes.size(); i++)

    count += m_selectedKeyframes[i].second.size();

  return count;

}

QPair<tdoubleparam *,="" int=""> FunctionSelection::getSelectedKeyframe(</tdoubleparam>

    int index) const {

  if (index < 0) return QPair<tdoubleparam *,="" int="">(0, -1);</tdoubleparam>

  for (int i = 0; i < m_selectedKeyframes.size(); i++) {

    int count = m_selectedKeyframes[i].second.size();

    if (index < count) {

      TDoubleParam *curve          = m_selectedKeyframes[i].first;

      QSet<int>::const_iterator it = m_selectedKeyframes[i].second.begin();</int>

      it += index;

      return QPair<tdoubleparam *,="" int="">(curve, *it);</tdoubleparam>

    }

    index -= count;

  }

  return QPair<tdoubleparam *,="" int="">(0, -1);</tdoubleparam>

}

// called from FunctionCurve::MousePressEvent() and

// NumericalColumns::SelectCells()

void FunctionSelection::selectSegment(TDoubleParam *curve, int k,

                                      QRect selectedCells) {

  if (curve == 0) return;

  // if a different curve is selected the clear the old selection

  if (m_selectedKeyframes.size() != 1 ||

      m_selectedKeyframes[0].first != curve) {

    curve->addRef();

    for (int i = 0; i < m_selectedKeyframes.size(); i++)

      if (m_selectedKeyframes[i].first) m_selectedKeyframes[i].first->release();

    m_selectedKeyframes.clear();

    m_selectedKeyframes.push_back(qMakePair(curve, QSet<int>()));</int>

  }

  m_selectedKeyframes[0].second.clear();

  m_selectedKeyframes[0].second.insert(k);  // k is keyframe id

  m_selectedKeyframes[0].second.insert(k + 1);

  m_selectedSegment = k;

  m_selectedCells   = selectedCells;

  makeCurrent();

  emit selectionChanged();

}

bool FunctionSelection::isSegmentSelected(TDoubleParam *curve, int k) const {

  return m_selectedKeyframes.size() == 1 &&

         m_selectedKeyframes[0].first == curve && m_selectedSegment == k;

}

QPair<tdoubleparam *,="" int=""> FunctionSelection::getSelectedSegment() const {</tdoubleparam>

  if (m_selectedKeyframes.size() == 1 && m_selectedSegment >= 0)

    return qMakePair(m_selectedKeyframes[0].first, m_selectedSegment);

  else

    return qMakePair<tdoubleparam *,="" int="">(0, -1);</tdoubleparam>

}

void FunctionSelection::enableCommands() {

  enableCommand(this, "MI_Copy", &FunctionSelection::doCopy);

  enableCommand(this, "MI_Paste", &FunctionSelection::doPaste);

  enableCommand(this, "MI_Cut", &FunctionSelection::doCut);

  enableCommand(this, "MI_Clear", &FunctionSelection::doDelete);

  enableCommand(this, "MI_Insert", &FunctionSelection::insertCells);

}

void FunctionSelection::doCopy() {

  if (isEmpty()) return;

  FunctionKeyframesData *data = new FunctionKeyframesData();

  int columnCount             = m_selectedKeyframes.size();

  data->setColumnCount(columnCount);

  for (int col = 0; col < columnCount; col++)

    data->getData(col, m_selectedKeyframes[col].first, m_selectedCells.top(),

                  m_selectedKeyframes[col].second);

  const QMimeData *oldData = QApplication::clipboard()->mimeData();

  TUndoManager::manager()->add(new KeyframesCopyUndo(oldData, data));

  QApplication::clipboard()->setMimeData(data);

}

void FunctionSelection::doPaste() {

  const FunctionKeyframesData *data =

      dynamic_cast<const *="" functionkeyframesdata="">(</const>

          QApplication::clipboard()->mimeData());

  if (!data) return;

  int rowCount = data->getRowCount();

  if (rowCount <= 0) return;

  int columnCount = data->getColumnCount();

  double frame    = 0;

  int col         = 0;

  std::vector<tdoubleparam *=""> params;</tdoubleparam>

  if (!m_selectedCells.isEmpty()) {

    col = m_selectedCells.left();

    // numeric columns

    for (int c = 0; c < columnCount; c++) {

      TDoubleParam *curve = getCurveFromColumn(col + c);

      if (curve) params.push_back(curve);

    }

    columnCount = (int)params.size();

    if (columnCount <= 0) return;

    frame = m_selectedCells.top();

    col   = m_selectedCells.left();

    selectCells(QRect(col, frame, columnCount, rowCount));

  } else {

    // curves

    // only single curve selection supported

    columnCount = 1;

    if (m_selectedKeyframes.empty()) return;

    TDoubleParam *curve = m_selectedKeyframes[0].first;

    if (curve == 0) return;

    int kIndex = *(m_selectedKeyframes[0].second.begin());

    frame      = curve->keyframeIndexToFrame(kIndex);

    params.push_back(curve);

  }

  /*--- カーブの貼り付け時に循環参照をチェックして、駄目ならアラートを返す ---*/

  for (int c = 0; c < columnCount; c++) {

    if (!data->isCircularReferenceFree(c, params[c])) {

      DVGui::warning(

          tr("There is a circular reference in the definition of the "

             "interpolation."));

      return;

    }

  }

  TUndoManager::manager()->add(new KeyframesPasteUndo(params, data, frame));

  for (int c = 0; c < columnCount; c++) data->setData(c, params[c], frame);

}

void FunctionSelection::doCut() {

  TUndoManager::manager()->beginBlock();

  doCopy();

  bool cellsSelection = !m_selectedCells.isEmpty();

  int bottomRow       = m_selectedCells.bottom();

  KeyframesMoveUndo *moveUndo = new KeyframesMoveUndo();

  for (int i = 0; i < m_selectedKeyframes.size(); i++) {

    TDoubleParam *curve       = m_selectedKeyframes[i].first;

    QSet<int> &kk             = m_selectedKeyframes[i].second;</int>

    double delta              = 0;

    if (cellsSelection) delta = -m_selectedCells.height();

    int n                     = curve ? curve->getKeyframeCount() : 0;

    int j                     = 0;

    for (int i = 0; i < n; i++) {

      if (kk.contains(i)) {

        if (i + 1 < n && kk.contains(i + 1) && !cellsSelection)

          delta += curve->keyframeIndexToFrame(i) -

                   curve->keyframeIndexToFrame(i + 1);

      } else {

        if ((cellsSelection && bottomRow <= curve->keyframeIndexToFrame(i)) ||

            (!cellsSelection && delta != 0))

          moveUndo->addMovement(curve, j, delta);

        j++;

      }

    }

  }

  doDelete();

  if (moveUndo->getCount()) {

    TUndoManager::manager()->add(moveUndo);

    moveUndo->redo();

  } else

    delete moveUndo;

  TUndoManager::manager()->endBlock();

  selectNone();

}

void FunctionSelection::doDelete() {

  if (isEmpty()) return;

  std::vector<keyframesdeleteundo::column> columns;</keyframesdeleteundo::column>

  for (int col = 0; col < (int)m_selectedKeyframes.size(); col++) {

    KeyframesDeleteUndo::Column column;

    TDoubleParam *param = m_selectedKeyframes[col].first;

    if (!param || !param->hasKeyframes()) continue;

    column.m_param     = param;

    column.m_keyframes = m_selectedKeyframes[col].second;

    columns.push_back(column);

  }

  if (columns.empty()) return;

  KeyframesDeleteUndo *undo = new KeyframesDeleteUndo(columns);

  undo->redo();

  TUndoManager::manager()->add(undo);

  selectNone();

}

void FunctionSelection::insertCells() {

  if (isEmpty()) return;

  QRect selectedCells     = getSelectedCells();

  int frameDelta          = selectedCells.height();

  int row                 = selectedCells.top();

  KeyframesMoveUndo *undo = new KeyframesMoveUndo();

  for (int c = selectedCells.left(); c <= selectedCells.right(); c++) {

    TDoubleParam *param = getCurveFromColumn(c);

    if (param && param->hasKeyframes()) {

      // Move keyframes in reverse, so their ordering remains consistent at each

      // step

      int k = param->getKeyframeCount() - 1;

      for (; k >= 0 && param->keyframeIndexToFrame(k) >= row; --k)

        undo->addMovement(param, k, frameDelta);

    }

  }

  undo->redo();

  TUndoManager::manager()->add(undo);

}

//=============================================================================

//

// FunctionKeyframesData

//

//-----------------------------------------------------------------------------

FunctionKeyframesData::FunctionKeyframesData() {}

FunctionKeyframesData::~FunctionKeyframesData() {}

void FunctionKeyframesData::setColumnCount(int columnCount) {

  m_keyframes.resize(columnCount);

}

void FunctionKeyframesData::getData(int columnIndex, TDoubleParam *curve,

                                    double frame, const QSet<int> &kIndices) {</int>

  assert(0 <= columnIndex && columnIndex < (int)m_keyframes.size());

  Keyframes &keyframes = m_keyframes[columnIndex];

  keyframes.clear();

  if (!kIndices.empty()) {

    double dFrame = -frame;

    QSet<int>::const_iterator it;</int>

    for (it = kIndices.begin(); it != kIndices.end(); ++it) {

      TDoubleKeyframe keyframe = curve->getKeyframe(*it);

      keyframe.m_frame += dFrame;

      keyframes.push_back(keyframe);

    }

  }

}

void FunctionKeyframesData::setData(int columnIndex, TDoubleParam *curve,

                                    double frame) const {

  assert(0 <= columnIndex && columnIndex < (int)m_keyframes.size());

  const Keyframes &keyframes = m_keyframes[columnIndex];

  int n                      = (int)keyframes.size();

  for (int i = 0; i < n; i++) {

    TDoubleKeyframe keyframe(keyframes[i]);

    keyframe.m_frame += frame;

    if (i == 0 || i == n - 1) keyframe.m_linkedHandles = false;

    curve->setKeyframe(keyframe);

  }

}

const FunctionKeyframesData::Keyframes &FunctionKeyframesData::getKeyframes(

    int columnIndex) const {

  assert(0 <= columnIndex && columnIndex < (int)m_keyframes.size());

  return m_keyframes[columnIndex];

}

DvMimeData *FunctionKeyframesData::clone() const {

  FunctionKeyframesData *data = new FunctionKeyframesData();

  data->m_keyframes           = m_keyframes;

  return data;

}

int FunctionKeyframesData::getRowCount() const {

  int rowCount = 0;

  for (int c = 0; c < (int)m_keyframes.size(); c++) {

    const Keyframes &keyframes = m_keyframes[c];

    if (!keyframes.empty()) {

      int row                          = (int)(keyframes.rbegin()->m_frame);

      if (row + 1 > rowCount) rowCount = row + 1;

    }

  }

  return rowCount;

}

/*---- カーブの貼り付け時に循環参照をチェックして、駄目ならfalseを返す ----*/

bool FunctionKeyframesData::isCircularReferenceFree(int columnIndex,

                                                    TDoubleParam *curve) const {

  const Keyframes &keyframes = m_keyframes[columnIndex];

  int n                      = (int)keyframes.size();

  // for each key frame

  for (int i = 0; i < n; i++) {

    TDoubleKeyframe keyframe(keyframes[i]);

    // only check Expression type

    if (keyframe.m_type != TDoubleKeyframe::Expression) continue;

    // check circular reference

    TExpression expr;

    expr.setGrammar(curve->getGrammar());

    expr.setText(keyframe.m_expressionText);

    if (dependsOn(expr, curve)) return false;

  }

  return true;

}