#include "toonzqt/functionsheet.h"

// TnzQt includes

#include "toonzqt/gutil.h"

#include "toonzqt/functionviewer.h"

// TnzLib includes

#include "toonz/tframehandle.h"

#include "toonz/doubleparamcmd.h"

#include "toonz/preferences.h"

// TnzBase includes

#include "tunit.h"

#include "../toonz/menubarcommandids.h"

// Qt includes

#include <qpainter></qpainter>

#include <qgridlayout></qgridlayout>

#include <qpaintevent></qpaintevent>

#include <qmenu></qmenu>

#include <qapplication>  //for drag&drop</qapplication>

#include <qdrag></qdrag>

//********************************************************************************

//    Local namespace stuff

//********************************************************************************

namespace {

const int cColumnDragHandleWidth = 8;

const int cGroupShortNameY =

    0;  //!< Column header's y pos for channel groups' short name tabs

const int cGroupLongNameY = 27;  //!< Same for its long name tabs

const int cChannelNameY = 50;  //!< Column header's y pos of channel name tabs,

                               //! up to the widget's height

const int cColHeadersEndY = 87;  //!< End of column headers y pos

}  // namespace

//********************************************************************************

//    Function Sheet Tools

//********************************************************************************

/*--- NumericalColumnsのセグメントの左側のバーをクリックしたとき ---*/

class MoveChannelsDragTool final : public Spreadsheet::DragTool {

  FunctionSheet *m_sheet;

  std::vector<keyframesetter *=""> m_setters;</keyframesetter>

  int m_oldRow;

  QRect m_selectedCells;

  int m_firstKeyframeRow;

public:

  MoveChannelsDragTool(FunctionSheet *sheet)

      : m_sheet(sheet), m_firstKeyframeRow(-1) {}

  void click(int row, int col, QMouseEvent *e) override {

    m_firstKeyframeRow                  = -1;

    FunctionTreeModel::Channel *channel = m_sheet->getChannel(col);

    if (!channel) return;

    TDoubleParam *curve = channel->getParam();

    int k0 = -1, k1 = -1;

    if (curve->isKeyframe(row))

      k0 = k1 = curve->getClosestKeyframe(row);

    else {

      k0 = curve->getPrevKeyframe(row);

      k1 = curve->getNextKeyframe(row);

    }

    // return if clicking outside of the segments

    if (k0 < 0 || k1 < 0) return;

    int r0 = tround(curve->keyframeIndexToFrame(k0));

    int r1 = tround(curve->keyframeIndexToFrame(k1));

    if (m_sheet->isSelectedCell(row, col)) {

      m_selectedCells = m_sheet->getSelectedCells();

      m_selectedCells.setTop(r0);

      m_selectedCells.setBottom(r1);

    } else

      m_selectedCells = QRect(col, r0, 1, r1 - r0 + 1);

    m_sheet->selectCells(m_selectedCells);

    /*---

シンプルに左のバーをクリックした場合はcolは1つだけ。

すでに複数Columnが選択されている上でその選択範囲内のセルの左バーをクリックした場合は

横（Column）幅は選択範囲に順ずるようになる。高さ(row)はクリックしたセグメントと同じになる。

---*/

    /*--- セグメントごとドラッグに備えてKeyFrameを格納する ---*/

    for (int col = m_selectedCells.left(); col <= m_selectedCells.right();

         ++col) {

      TDoubleParam *curve = m_sheet->getCurve(col);

      if (!curve) continue;

      KeyframeSetter *setter = new KeyframeSetter(curve);

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

        int row = (int)curve->keyframeIndexToFrame(k);

        if (r0 <= row && row <= r1) {

          if (m_firstKeyframeRow < 0 || row < m_firstKeyframeRow)

            m_firstKeyframeRow = row;

          setter->selectKeyframe(k);

        }

      }

      m_setters.push_back(setter);

    }

    m_oldRow = row;

  }

  void drag(int row, int col, QMouseEvent *e) override {

    int d                             = row - m_oldRow;

    m_oldRow                          = row;

    if (d + m_firstKeyframeRow < 0) d = -m_firstKeyframeRow;

    m_firstKeyframeRow += d;

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

      m_setters[i]->moveKeyframes(d, 0.0);

    m_selectedCells.translate(0, d);

    m_sheet->selectCells(m_selectedCells);

  }

  void release(int row, int col, QMouseEvent *e) override {

    for (int i = 0; i < (int)m_setters.size(); i++) delete m_setters[i];

    m_setters.clear();

  }

};

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

/*--- NumericalColumnsのセル部分をクリックしたとき ---*/

class FunctionSheetSelectionTool final : public Spreadsheet::DragTool {

  int m_firstRow, m_firstCol;

  FunctionSheet *m_sheet;

public:

  FunctionSheetSelectionTool(FunctionSheet *sheet)

      : m_sheet(sheet), m_firstRow(-1), m_firstCol(-1) {}

  void click(int row, int col, QMouseEvent *e) override {

    if (0 != (e->modifiers() & Qt::ShiftModifier) &&

        !m_sheet->getSelectedCells().isEmpty()) {

      QRect selectedCells = m_sheet->getSelectedCells();

      if (col < selectedCells.center().x()) {

        m_firstCol = selectedCells.right();

        selectedCells.setLeft(col);

      } else {

        m_firstCol = selectedCells.left();

        selectedCells.setRight(col);

      }

      if (row < selectedCells.center().y()) {

        m_firstRow = selectedCells.bottom();

        selectedCells.setTop(row);

      } else {

        m_firstRow = selectedCells.top();

        selectedCells.setBottom(row);

      }

      m_sheet->selectCells(selectedCells);

    } else {

      // regular click, no shift

      m_firstCol = col;

      m_firstRow = row;

      QRect selectedCells(col, row, 1, 1);

      m_sheet->selectCells(selectedCells);

    }

  }

  void drag(int row, int col, QMouseEvent *e) override {

    if (row < 0) row = 0;

    if (col < 0) col = 0;

    int r0           = qMin(row, m_firstRow);

    int r1           = qMax(row, m_firstRow);

    int c0           = qMin(col, m_firstCol);

    int c1           = qMax(col, m_firstCol);

    QRect selectedCells(c0, r0, c1 - c0 + 1, r1 - r0 + 1);

    m_sheet->selectCells(selectedCells);

  }

  void release(int row, int col, QMouseEvent *e) override {

    if (row == m_firstRow && col == m_firstCol) {

      if (Preferences::instance()->isMoveCurrentEnabled())

        m_sheet->setCurrentFrame(row);

      FunctionTreeModel::Channel *channel = m_sheet->getChannel(col);

      if (channel) channel->setIsCurrent(true);

    }

  }

};

//********************************************************************************

//    FunctionSheetRowViewer  implementation

//********************************************************************************

FunctionSheetRowViewer::FunctionSheetRowViewer(FunctionSheet *parent)

    : Spreadsheet::RowPanel(parent), m_sheet(parent) {

  setMinimumSize(QSize(100, 100));

  setMouseTracking(true);

  setFocusPolicy(Qt::NoFocus);

}

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

void FunctionSheetRowViewer::paintEvent(QPaintEvent *e) {

  // calls GenericPanel's event

  Spreadsheet::RowPanel::paintEvent(e);

}

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

void FunctionSheetRowViewer::mousePressEvent(QMouseEvent *e) {

  // calls GenericPanel's event

  Spreadsheet::RowPanel::mousePressEvent(e);

}

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

void FunctionSheetRowViewer::mouseMoveEvent(QMouseEvent *e) {

  // calls GenericPanel's event

  Spreadsheet::RowPanel::mouseMoveEvent(e);

}

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

void FunctionSheetRowViewer::mouseReleaseEvent(QMouseEvent *e) {

  Spreadsheet::RowPanel::mouseReleaseEvent(e);

}

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

void FunctionSheetRowViewer::contextMenuEvent(QContextMenuEvent *event) {

  QMenu *menu                = new QMenu(this);

  CommandManager *cmdManager = CommandManager::instance();

  menu->addAction(cmdManager->getAction(MI_InsertSceneFrame));

  menu->addAction(cmdManager->getAction(MI_RemoveSceneFrame));

  menu->addAction(cmdManager->getAction(MI_InsertGlobalKeyframe));

  menu->addAction(cmdManager->getAction(MI_RemoveGlobalKeyframe));

  menu->exec(event->globalPos());

}

//********************************************************************************

//    FunctionSheetColumnHeadViewer  implementation

//********************************************************************************

FunctionSheetColumnHeadViewer::FunctionSheetColumnHeadViewer(

    FunctionSheet *parent)

    : Spreadsheet::ColumnPanel(parent), m_sheet(parent), m_draggingChannel(0) {

  setMouseTracking(true);  // for updating the tooltip

  setFocusPolicy(Qt::NoFocus);

}

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

void FunctionSheetColumnHeadViewer::paintEvent(QPaintEvent *e) {

  QPainter painter(this);

  QRect toBeUpdated = e->rect();

  painter.setClipRect(toBeUpdated);

  // visible columns range

  CellRange visible = getViewer()->xyRectToRange(toBeUpdated);

  int c0            = visible.from().layer();

  int c1            = visible.to().layer();

  if (c0 > c1) return;

  int n = c1 - c0 + 1 + 2;

  FunctionTreeModel::ChannelGroup *currentGroup = 0;

  /*--- Display range + right and left 1 column range ChannelGroup. If there is

   * none, put 0

   * ---*/

  std::vector<functiontreemodel::channelgroup *=""> channelGroups(n);</functiontreemodel::channelgroup>

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

    channelGroups[i] = 0;

    int c = c0 - 1 + i;

    if (c < 0) continue;

    FunctionTreeModel::Channel *channel = m_sheet->getChannel(c);

    if (!channel) continue;

    channelGroups[i] = channel->getChannelGroup();

    if (!currentGroup && channel->isCurrent()) currentGroup = channelGroups[i];

  }

  int y0 = 0;

  int y1 = 17;  // needs work

  int y2 = 34;

  int y3 = 53;

  /*--- Fill header with background color ---*/

  for (int c = c0; c <= c1; c++) {

    FunctionTreeModel::Channel *channel = m_sheet->getChannel(c);

    if (!channel) continue;

    int x0 = getViewer()->columnToX(c);

    int x1 = getViewer()->columnToX(c + 1) - 1;

    // Column Width

    int width = x1 - x0 + 1;

    painter.fillRect(x0, y0, width, y3 - y0, getViewer()->getBGColor());

  }

  for (int c = c0; c <= c1; ++c) {

    FunctionTreeModel::Channel *channel = m_sheet->getChannel(c);

    if (!channel) continue;

    int i = c - c0 + 1;

    /*---- Channel Column of the current Column and the preceding and following

     * Columns ---*/

    FunctionTreeModel::ChannelGroup *prevGroup = channelGroups[c - c0],

                                    *group     = channelGroups[c - c0 + 1],

                                    *nextGroup = channelGroups[c - c0 + 2];

    /*---- If the group is different from the before and after, flags are set

     * respectively ---*/

    bool firstGroupColumn = prevGroup != group;

    bool lastGroupColumn  = nextGroup != group;

    /*--- The left and right coordinates of the current column ---*/

    int x0 = getViewer()->columnToX(c);

    int x1 = getViewer()->columnToX(c + 1) - 1;

    // Column width

    int width = x1 - x0 + 1;

    QRect selectedRect = m_sheet->getSelectedCells();

    bool isSelected =

        (selectedRect.left() <= c && c <= selectedRect.right()) ? true : false;

    // paint with light color if selected

    if (isSelected)

      painter.fillRect(x0, y1, width, y3 - y1,

                       getViewer()->getCurrentRowBgColor());

    // draw horizonntal lines

    painter.setPen(QPen(getViewer()->getColumnHeaderBorderColor(), 3));

    painter.drawLine(x0, y0, x1, y0);

    painter.setPen(getViewer()->getColumnHeaderBorderColor());

    painter.drawLine(x0, y1, x1, y1);

    // draw vertical bar

    painter.fillRect(x0, y1, 6, y3 - y1,

                     getViewer()->getColumnHeaderBorderColor());

    if (firstGroupColumn)

      painter.fillRect(x0, y0, 6, y1 - y0,

                       getViewer()->getColumnHeaderBorderColor());

    // channel name

    painter.setPen(getViewer()->getTextColor());

    if (channel->isCurrent())

      painter.setPen(getViewer()->getSelectedColumnTextColor());

    QString text = channel->getShortName();

    int d        = 8;

    painter.drawText(x0 + d, y1, width - d, y3 - y1 + 1,

                     Qt::TextWrapAnywhere | Qt::AlignLeft | Qt::AlignVCenter,

                     text);

    // group name

    if (firstGroupColumn) {

      int tmpwidth = (lastGroupColumn) ? width : width * 2;

      painter.setPen(getViewer()->getTextColor());

      if (group == currentGroup)

        painter.setPen(getViewer()->getSelectedColumnTextColor());

      text = group->getShortName();

      painter.drawText(x0 + d, y0, tmpwidth - d, y1 - y0 + 1,

                       Qt::AlignLeft | Qt::AlignVCenter, text);

    }

  }

}

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

/*! update tooltips

*/

void FunctionSheetColumnHeadViewer::mouseMoveEvent(QMouseEvent *e) {

  if ((e->buttons() & Qt::MidButton) && m_draggingChannel &&

      (e->pos() - m_dragStartPosition).manhattanLength() >=

          QApplication::startDragDistance()) {

    QDrag *drag         = new QDrag(this);

    QMimeData *mimeData = new QMimeData;

    mimeData->setText(m_draggingChannel->getExprRefName());

    drag->setMimeData(mimeData);

    static const QPixmap cursorPixmap(":Resources/dragcursor_exp_text.png");

    drag->setDragCursor(cursorPixmap, Qt::MoveAction);

    Qt::DropAction dropAction = drag->exec();

    return;

  }

  // get the column under the cursor

  int col = getViewer()->xyToPosition(e->pos()).layer();

  FunctionTreeModel::Channel *channel = m_sheet->getChannel(col);

  if (!channel) {

    setToolTip(QString(""));

  } else

    setToolTip(channel->getExprRefName());

}

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

void FunctionSheetColumnHeadViewer::mousePressEvent(QMouseEvent *e) {

  QPoint pos   = e->pos();

  int currentC = getViewer()->xyToPosition(pos).layer();

  FunctionTreeModel::Channel *channel;

  for (int c = 0; c <= m_sheet->getChannelCount(); c++) {

    channel = m_sheet->getChannel(c);

    if (!channel || c != currentC) continue;

    break;

  }

  if (channel && e->button() == Qt::MidButton) {

    m_draggingChannel   = channel;

    m_dragStartPosition = e->pos();

    return;

  } else if (channel)

    channel->setIsCurrent(true);

  m_draggingChannel = 0;

  if (!channel) return;

  // Open folder

  FunctionTreeModel::ChannelGroup *channelGroup = channel->getChannelGroup();

  if (!channelGroup->isOpen())

    channelGroup->getModel()->setExpandedItem(channelGroup->createIndex(),

                                              true);

  // Select all segment

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

  channel->getParam()->getKeyframes(frames);

  QRect rect(0, 0, 0, 0);

  if (!frames.empty()) rect = QRect(currentC, 0, 1, (*frames.rbegin()) + 1);

  getViewer()->selectCells(rect);

}

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

void FunctionSheetColumnHeadViewer::contextMenuEvent(QContextMenuEvent *ce) {

  // First, select column under cursor

  const QPoint &pos = ce->pos();

  int cursorCol     = getViewer()->xyToPosition(pos).layer();

  if (cursorCol < 0 || cursorCol >= m_sheet->getChannelCount()) return;

  FunctionTreeModel::Channel *channel = m_sheet->getChannel(cursorCol);

  if (!channel) return;

  // Ok, now let's summon a context menu with appropriate options

  FunctionViewer *fv = m_sheet->getViewer();

  if (!fv) {

    assert(fv);

    return;

  }

  const QPoint &globalPos = mapToGlobal(pos);

  if (pos.y() >= cChannelNameY)

    fv->openContextMenu(channel, globalPos);

  else {

    FunctionTreeModel::ChannelGroup *group = channel->getChannelGroup();

    // In this case, commands are different from the tree view. Rather than

    // showing in the tree,

    // channels get ACTIVATED

    QMenu menu;

    QAction showAnimatedOnly(FunctionTreeView::tr("Show Animated Only"), 0);

    QAction showAll(FunctionTreeView::tr("Show All"), 0);

    menu.addAction(&showAnimatedOnly);

    menu.addAction(&showAll);

    // execute menu

    QAction *action = menu.exec(globalPos);

    if (action != &showAll && action != &showAnimatedOnly) return;

    // Process action

    if (action == &showAll) {

      int c, cCount = group->getChildCount();

      for (c = 0; c != cCount; ++c) {

        FunctionTreeModel::Channel *channel =

            dynamic_cast<functiontreemodel::channel *="">(group->getChild(c));</functiontreemodel::channel>

        if (channel && !channel->isHidden()) channel->setIsActive(true);

      }

    } else if (action == &showAnimatedOnly) {

      int c, cCount = group->getChildCount();

      for (c = 0; c != cCount; ++c) {

        FunctionTreeModel::Channel *channel =

            dynamic_cast<functiontreemodel::channel *="">(group->getChild(c));</functiontreemodel::channel>

        if (channel && !channel->isHidden())

          channel->setIsActive(channel->isAnimated());

      }

    }

    fv->update();

  }

}

//********************************************************************************

//    FunctionSheetCellViewer  implementation

//********************************************************************************

FunctionSheetCellViewer::FunctionSheetCellViewer(FunctionSheet *parent)

    : Spreadsheet::CellPanel(parent)

    , m_sheet(parent)

    , m_editRow(0)

    , m_editCol(0) {

  m_lineEdit = new DVGui::LineEdit(this);

  // lineEdit->setGeometry(10,10,100,30);

  m_lineEdit->hide();

  bool ret = connect(m_lineEdit, SIGNAL(editingFinished()), this,

                     SLOT(onCellEditorEditingFinished()));

  assert(ret);

  setMouseTracking(true);

  setFocusProxy(m_lineEdit);

}

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

/*! Called when the cell panel is left/right-clicked

*/

Spreadsheet::DragTool *FunctionSheetCellViewer::createDragTool(QMouseEvent *e) {

  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());

  int row                   = cellPosition.frame();

  int col                   = cellPosition.layer();

  bool isEmpty              = true;

  TDoubleParam *curve       = m_sheet->getCurve(col);

  if (curve) {

    int kCount = curve->getKeyframeCount();

    if (kCount > 0) {

      int row0 = (int)curve->keyframeIndexToFrame(0);

      int row1 = (int)curve->keyframeIndexToFrame(kCount - 1);

      isEmpty  = row < row0 || row > row1;

    }

  }

  if (!isEmpty) {

    int x = e->pos().x() - getViewer()->columnToX(col);

    if (0 <= x && x < cColumnDragHandleWidth + 9)

      return new MoveChannelsDragTool(m_sheet);

  }

  return new FunctionSheetSelectionTool(m_sheet);

  // return Spreadsheet::CellPanel::createDragTool(e);

}

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

void FunctionSheetCellViewer::drawCells(QPainter &painter, int r0, int c0,

                                        int r1, int c1) {

  // key frames

  QColor KeyFrameColor         = getViewer()->getKeyFrameColor();

  QColor KeyFrameBorderColor   = getViewer()->getKeyFrameBorderColor();

  QColor SelectedKeyFrameColor = getViewer()->getSelectedKeyFrameColor();

  // inbetween

  QColor InBetweenColor         = getViewer()->getInBetweenColor();

  QColor InBetweenBorderColor   = getViewer()->getInBetweenBorderColor();

  QColor SelectedInBetweenColor = getViewer()->getSelectedInBetweenColor();

  // empty cells

  QColor SelectedEmptyColor = getViewer()->getSelectedEmptyColor();

  // empty cells in scene frame range

  QColor SelectedSceneRangeEmptyColor =

      getViewer()->getSelectedSceneRangeEmptyColor();

  // top and bottom pos

  int y0 = getViewer()->rowToY(r0);

  int y1 = getViewer()->rowToY(r1 + 1) - 1;

  for (int c = c0; c <= c1; c++) {

    TDoubleParam *curve = m_sheet->getCurve(c);

    /*--- もしカラムcにパラメータが無ければcurveには０が返る ---*/

    if (!curve) continue;

    // left and right pos

    int x0 = getViewer()->columnToX(c);

    int x1 = getViewer()->columnToX(c + 1) - 1;

    // find the curve keyframe range

    int kr0 = 0, kr1 = -1;

    int kCount = curve->getKeyframeCount();

    if (kCount > 0) {

      kr0 = curve->keyframeIndexToFrame(0);

      kr1 = curve->keyframeIndexToFrame(kCount - 1);

    }

    // get the unit

    TMeasure *measure = curve->getMeasure();

    const TUnit *unit = measure ? measure->getCurrentUnit() : 0;

    // draw each cell

    for (int row = r0; row <= r1; row++) {

      int ya = m_sheet->rowToY(row);

      int yb = m_sheet->rowToY(row + 1) - 1;

      bool isSelected = getViewer()->isSelectedCell(row, c);

      double value    = curve->getValue(row);

      if (unit) value = unit->convertTo(value);

      QRect cellRect(x0, ya, x1 - x0 + 1, yb - ya + 1);

      QRect borderRect(x0, ya, 7, yb - ya + 1);

      QColor cellColor, borderColor;

      /*--- キーフレーム間の範囲だけ色をつける ---*/

      if (kr0 <= row && row <= kr1) {

        if (curve->isKeyframe(row)) {

          cellColor   = (isSelected) ? SelectedKeyFrameColor : KeyFrameColor;

          borderColor = KeyFrameBorderColor;

        } else {

          cellColor   = (isSelected) ? SelectedInBetweenColor : InBetweenColor;

          borderColor = InBetweenBorderColor;

        }

        painter.setPen(Qt::NoPen);

        painter.fillRect(cellRect, cellColor);

        painter.fillRect(borderRect, borderColor);

        // display whether segment are Linked

        if (curve->isKeyframe(row)) {

          TDoubleKeyframe kf = curve->getKeyframeAt(row);

          // if the segments are NOT linked, then cut off the side bar

          if (!kf.m_linkedHandles) {

            int rowCenterPos = (ya + yb) / 2;

            QPoint points[4] = {

                QPoint(x0, rowCenterPos), QPoint(x0 + 7, rowCenterPos + 3),

                QPoint(x0 + 7, rowCenterPos - 3), QPoint(x0, rowCenterPos)};

            QBrush oldBrush = painter.brush();

            painter.setBrush(QBrush(cellColor));

            painter.drawPolygon(points, 4);

            painter.setBrush(oldBrush);

          }

        }

        // draw cell value

        painter.setPen(getViewer()->getTextColor());

        /*--- 整数から小数点以下3桁以内の場合はそれ以降の0000を描かない ---*/

        QString text;

        double thousandValue = value * 1000.0;

        if (areAlmostEqual(thousandValue, (double)tround(thousandValue),

                           0.0001)) {

          text = QString::number(value, 'f', 3);

          while (text.endsWith("0")) {

            text.chop(1);

            if (text.endsWith(".")) {

              text.chop(1);

              break;

            }

          }

        } else {

          text = QString::number(value, 'f', 4);

          text.truncate(5);

          text.append("~");

        }

        QString fontName = Preferences::instance()->getInterfaceFont();

        if (fontName == "") {

#ifdef _WIN32

          fontName = "Arial";

#else

          fontName = "Helvetica";

#endif

        }

        static QFont font(fontName, -1, QFont::Bold);

        font.setPixelSize(12);

        painter.setFont(font);

        painter.drawText(cellRect.adjusted(10, 0, 0, 0),

                         Qt::AlignVCenter | Qt::AlignLeft, text);

      }

      // empty and selected cell

      else if (isSelected) {

        int rowCount = getViewer()->getRowCount();

        cellColor    = (row >= rowCount) ? SelectedEmptyColor

                                      : SelectedSceneRangeEmptyColor;

        painter.setPen(Qt::NoPen);

        painter.fillRect(cellRect, cellColor);

      }

    }

  }

}

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

void FunctionSheetCellViewer::mouseDoubleClickEvent(QMouseEvent *e) {

  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());

  int row                   = cellPosition.frame();

  int col                   = cellPosition.layer();

  int x0, y0, x1, y1;

  x0 = getViewer()->columnToX(col);

  x1 = getViewer()->columnToX(col + 1) - 1;

  y0 = getViewer()->rowToY(row);

  y1 = getViewer()->rowToY(row + 1) - 1;

  m_editRow = row;

  m_editCol = col;

  TDoubleParam *curve = m_sheet->getCurve(col);

  if (curve) {

    double v          = curve->getValue(row);

    TMeasure *measure = curve->getMeasure();

    const TUnit *unit = measure ? measure->getCurrentUnit() : 0;

    if (unit) v       = unit->convertTo(v);

    m_lineEdit->setText(QString::number(v, 'f', 4));

    // in order to put the cursor to the left end

    m_lineEdit->setSelection(m_lineEdit->text().length(),

                             -m_lineEdit->text().length());

  } else

    m_lineEdit->setText("");

  QString fontName = Preferences::instance()->getInterfaceFont();

  if (fontName == "") {

#ifdef _WIN32

    fontName = "Arial";

#else

    fontName = "Helvetica";

#endif

  }

  static QFont font(fontName, 9, QFont::Normal);

  m_lineEdit->setFont(font);

  m_lineEdit->setGeometry(x0 - 2, y0 - 2, x1 - x0 + 1 + 4,

                          y1 - y0 + 1 + 4);  // x0,y0,x1-x0+1,y0-y1+1);

  m_lineEdit->show();

  m_lineEdit->raise();

  m_lineEdit->setFocus();

}

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

void FunctionSheetCellViewer::onCellEditorEditingFinished() {

  QString text = m_lineEdit->text();

  if (!text.isEmpty() && m_lineEdit->isReturnPressed()) {

    double value        = text.toDouble();

    TDoubleParam *curve = m_sheet->getCurve(m_editCol);

    if (curve) {

      TMeasure *measure = curve->getMeasure();

      const TUnit *unit = measure ? measure->getCurrentUnit() : 0;

      if (unit) value   = unit->convertFrom(value);

      KeyframeSetter::setValue(curve, m_editRow, value);

    }

  }

  m_lineEdit->hide();

  m_lineEdit->clearFocus();

  m_sheet->setFocus();

  update();

}

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

void FunctionSheetCellViewer::mousePressEvent(QMouseEvent *e) {

  // escape from the line edit by clicking outside

  if (m_lineEdit->isVisible()) {

    m_lineEdit->hide();

    m_lineEdit->clearFocus();

    m_sheet->setFocus();

  }

  if (e->button() == Qt::LeftButton || e->button() == Qt::MidButton)

    Spreadsheet::CellPanel::mousePressEvent(e);

  else if (e->button() == Qt::RightButton) {

    update();

    openContextMenu(e);

  }

}

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

void FunctionSheetCellViewer::mouseReleaseEvent(QMouseEvent *e) {

  Spreadsheet::CellPanel::mouseReleaseEvent(e);

  /*

  CellPosition cellPosition = getViewer ()->xyToPosition (e->pos ());

int row = cellPosition.frame ();

int col = cellPosition.layer ();

FunctionSheet::DragTool *dragTool = m_sheet->getDragTool();

if(dragTool) dragTool->release(row,col);

m_sheet->setDragTool(0);

*/

}

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

void FunctionSheetCellViewer::mouseMoveEvent(QMouseEvent *e) {

  Spreadsheet::CellPanel::mouseMoveEvent(e);

}

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

// TODO: refactor: cfr functionpanel.cpp

void FunctionSheetCellViewer::openContextMenu(QMouseEvent *e) {

  struct locals {

    static void sheet__setSegmentType(FunctionSelection *selection,

                                      TDoubleParam *curve, int segmentIndex,

                                      TDoubleKeyframe::Type type) {

      selection->selectSegment(curve, segmentIndex);

      KeyframeSetter setter(curve, segmentIndex);

      setter.setType(type);

    }

  };  // locals

  QAction deleteKeyframeAction(tr("Delete Key"), 0);

  QAction insertKeyframeAction(tr("Set Key"), 0);

  QAction setLinearAction(tr("Linear Interpolation"), 0);

  QAction setSpeedInOutAction(tr("Speed In / Speed Out Interpolation"), 0);

  QAction setEaseInOutAction(tr("Ease In / Ease Out Interpolation"), 0);

  QAction setEaseInOut2Action(tr("Ease In / Ease Out (%) Interpolation"), 0);

  QAction setExponentialAction(tr("Exponential Interpolation"), 0);

  QAction setExpressionAction(tr("Expression Interpolation"), 0);

  QAction setFileAction(tr("File Interpolation"), 0);

  QAction setConstantAction(tr("Constant Interpolation"), 0);

  QAction setStep1Action(tr("Step 1"), 0);

  QAction setStep2Action(tr("Step 2"), 0);

  QAction setStep3Action(tr("Step 3"), 0);

  QAction setStep4Action(tr("Step 4"), 0);

  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());

  int row                   = cellPosition.frame();

  int col                   = cellPosition.layer();

  TDoubleParam *curve       = m_sheet->getCurve(col);

  if (!curve) return;

  bool isEmpty    = true;

  bool isKeyframe = false;

  // find the curve keyframe range

  int kCount = curve->getKeyframeCount();

  if (kCount > 0) {

    if (curve->keyframeIndexToFrame(0) <= row &&

        row <= curve->keyframeIndexToFrame(kCount - 1)) {

      isEmpty    = false;

      isKeyframe = curve->isKeyframe(row);

    }

  }

  int kIndex = curve->getPrevKeyframe(row);

  // build menu

  QMenu menu(0);

  if (!isKeyframe)  // menu.addAction(&deleteKeyframeAction); else

    menu.addAction(&insertKeyframeAction);

  if (!isEmpty && !isKeyframe && kIndex >= 0) {

    menu.addSeparator();

    TDoubleKeyframe kf = curve->getKeyframe(kIndex);

    if (kf.m_type != TDoubleKeyframe::Linear) menu.addAction(&setLinearAction);

    if (kf.m_type != TDoubleKeyframe::SpeedInOut)

      menu.addAction(&setSpeedInOutAction);

    if (kf.m_type != TDoubleKeyframe::EaseInOut)

      menu.addAction(&setEaseInOutAction);

    if (kf.m_type != TDoubleKeyframe::EaseInOutPercentage)

      menu.addAction(&setEaseInOut2Action);

    if (kf.m_type != TDoubleKeyframe::Exponential)

      menu.addAction(&setExponentialAction);

    if (kf.m_type != TDoubleKeyframe::Expression)

      menu.addAction(&setExpressionAction);

    if (kf.m_type != TDoubleKeyframe::File) menu.addAction(&setFileAction);

    if (kf.m_type != TDoubleKeyframe::Constant)

      menu.addAction(&setConstantAction);

    menu.addSeparator();

    if (kf.m_step != 1) menu.addAction(&setStep1Action);

    if (kf.m_step != 2) menu.addAction(&setStep2Action);

    if (kf.m_step != 3) menu.addAction(&setStep3Action);

    if (kf.m_step != 4) menu.addAction(&setStep4Action);

  }

  menu.addSeparator();

  CommandManager *cmdManager = CommandManager::instance();

  menu.addAction(cmdManager->getAction("MI_Cut"));

  menu.addAction(cmdManager->getAction("MI_Copy"));

  menu.addAction(cmdManager->getAction("MI_Paste"));

  menu.addAction(cmdManager->getAction("MI_Clear"));

  menu.addAction(cmdManager->getAction("MI_Insert"));

  FunctionSelection *selection = m_sheet->getSelection();

  // execute menu

  QAction *action = menu.exec(e->globalPos());  // QCursor::pos());

  if (action == &deleteKeyframeAction) {

    KeyframeSetter::removeKeyframeAt(curve, row);

  } else if (action == &insertKeyframeAction) {

    KeyframeSetter(curve).createKeyframe(row);

  } else if (action == &setLinearAction)

    locals::sheet__setSegmentType(selection, curve, kIndex,

                                  TDoubleKeyframe::Linear);

  else if (action == &setSpeedInOutAction)

    locals::sheet__setSegmentType(selection, curve, kIndex,

                                  TDoubleKeyframe::SpeedInOut);

  else if (action == &setEaseInOutAction)