#include "toonzqt/spreadsheetviewer.h"
#include "toonzqt/gutil.h"
#include "toonz/preferences.h"
#include "toonz/toonzfolders.h"
#include "toonz/tframehandle.h"
#include "orientation.h"

#include <QKeyEvent>
#include <QWheelEvent>
#include <QLabel>
#include <QScrollBar>
#include <QPainter>
#include <QGridLayout>
#include <QPaintEvent>
#include <QToolTip>
#include <assert.h>

#include <QMainWindow>
#include <QDockWidget>
#include <QSettings>

namespace Spreadsheet {

//=============================================================================
FrameScroller::FrameScroller()
    : m_orientation(Orientations::topToBottom())
    , m_scrollArea(nullptr)
    , m_lastX(0)
    , m_lastY(0)
    , m_syncing(false) {}

FrameScroller::~FrameScroller() {}

void FrameScroller::setFrameScrollArea(QScrollArea *scrollArea) {
  disconnectScrollbars();
  m_scrollArea = scrollArea;
  connectScrollbars();
}

void FrameScroller::disconnectScrollbars() {
  if (!m_scrollArea) return;
  disconnect(m_scrollArea->verticalScrollBar(), &QScrollBar::valueChanged, this,
             &FrameScroller::onVScroll);
  disconnect(m_scrollArea->horizontalScrollBar(), &QScrollBar::valueChanged,
             this, &FrameScroller::onHScroll);
}

void FrameScroller::connectScrollbars() {
  if (!m_scrollArea) return;
  m_lastX = m_scrollArea->horizontalScrollBar()->value();
  m_lastY = m_scrollArea->verticalScrollBar()->value();
  connect(m_scrollArea->verticalScrollBar(), &QScrollBar::valueChanged, this,
          &FrameScroller::onVScroll);
  connect(m_scrollArea->horizontalScrollBar(), &QScrollBar::valueChanged, this,
          &FrameScroller::onHScroll);
}

void FrameScroller::onVScroll(int y) {
  QPoint offset(0, y - m_lastY);
  if (isSyncing()) return;
  m_lastY = y;
  setSyncing(true);
  handleScroll(offset);
  setSyncing(false);
}
void FrameScroller::onHScroll(int x) {
  QPoint offset(x - m_lastX, 0);
  if (isSyncing()) return;
  m_lastX = x;
  setSyncing(true);
  handleScroll(offset);
  setSyncing(false);
}

static QList<FrameScroller *> frameScrollers;

void FrameScroller::handleScroll(QPoint &offset) {
  if ((m_orientation->isVerticalTimeline() && offset.x()) ||
      (!m_orientation->isVerticalTimeline() &&
       offset.y()))  // only synchronize changes by frames axis
    return;

  QPointF offsetF(offset);
  // In case of a zoomed viewer is sending this out, adjust the
  // zoomed offset back to a standardized offset
  emit zoomScrollAdjust(offsetF, false);

  CellPositionRatio ratio = orientation()->xyToPositionRatio(offsetF);

  for (int i = 0; i < frameScrollers.size(); i++)
    if (frameScrollers[i] != this) {
      if (!frameScrollers[i]->isSyncing()) {
        frameScrollers[i]->onScroll(ratio);
        break;
      }
    }
}

void adjustScrollbar(QScrollBar *scrollBar, int add);

void FrameScroller::onScroll(const CellPositionRatio &ratio) {
  QPointF offset = orientation()->positionRatioToXY(ratio);

  // In case of a zoomed viewer is receiving this, adjust the
  // standardized offset to zoomed offset

  emit zoomScrollAdjust(offset, true);

  // scroll area should be resized before moving down the scroll bar.
  // SpreadsheetViewer::onPrepareToScrollOffset() will be invoked immediately
  // since the receiver is in the same thread.
  // when moving up the scroll bar, resizing will be done in
  // SpreadsheetViewer::onVSliderChanged().
  if (offset.x() > 0.0 || offset.y() > 0.0) emit prepareToScrollOffset(offset);
  if ((int)offset.x())
    adjustScrollbar(m_scrollArea->horizontalScrollBar(), (int)offset.x());
  if ((int)offset.y())
    adjustScrollbar(m_scrollArea->verticalScrollBar(), (int)offset.y());
}

void adjustScrollbar(QScrollBar *scrollBar, int add) {
  scrollBar->setValue(scrollBar->value() + add);
}

void FrameScroller::registerFrameScroller() {
  if (!frameScrollers.contains(this)) frameScrollers.append(this);
}

void FrameScroller::unregisterFrameScroller() {
  if (frameScrollers.contains(this)) frameScrollers.removeAll(this);
}

void FrameScroller::prepareToScrollOthers(const QPointF &offset) {
  CellPositionRatio ratio = orientation()->xyToPositionRatio(offset);
  for (int i = 0; i < frameScrollers.size(); i++)
    if (frameScrollers[i] != this)
      frameScrollers[i]->prepareToScrollRatio(ratio);
}
void FrameScroller::prepareToScrollRatio(const CellPositionRatio &ratio) {
  QPointF offset = orientation()->positionRatioToXY(ratio);
  emit prepareToScrollOffset(offset);
}

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

void SetFrameDragTool::click(int row, int col, QMouseEvent *e) {
  m_frameHandle->setFrame(row);
}

void SetFrameDragTool::drag(int row, int col, QMouseEvent *e) {
  if (row < 0) row = 0;
  m_frameHandle->setFrame(row);
}

void SetFrameDragTool::release(int row, int col, QMouseEvent *e) {}

//=============================================================================
//
// SelectionDragTool
//
//-----------------------------------------------------------------------------

SelectionDragTool::SelectionDragTool(SpreadsheetViewer *viewer)
    : m_viewer(viewer), m_firstRow(-1), m_firstCol(-1) {}

void SelectionDragTool::click(int row, int col, QMouseEvent *e) {
  m_firstCol = col;
  m_firstRow = row;
  QRect selectedCells(col, row, 1, 1);
  m_viewer->selectCells(selectedCells);
}

void SelectionDragTool::drag(int row, int col, QMouseEvent *e) {
  int r0 = std::min(row, m_firstRow);
  int r1 = std::max(row, m_firstRow);
  int c0 = std::min(col, m_firstCol);
  int c1 = std::max(col, m_firstCol);
  QRect selectedCells(c0, r0, c1 - c0 + 1, r1 - r0 + 1);
  m_viewer->selectCells(selectedCells);
}

void SelectionDragTool::release(int row, int col, QMouseEvent *e) {}

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

PanTool::PanTool(Spreadsheet::GenericPanel *panel)
    : m_panel(panel), m_viewer(panel->getViewer()), m_lastPos() {}

void PanTool::click(int row, int col, QMouseEvent *e) {
  m_lastPos = e->pos();  // m_panel->mapToGlobal(e->pos());
}
void PanTool::drag(int row, int col, QMouseEvent *e) {
  QPoint pos = e->pos();  // m_panel->mapToGlobal(e->pos());
  // QPoint delta = p - m_lastPos;
  // m_lastPos = p;
  // QToolTip::showText(p,"delta="+QString::number(delta.x())+","+QString::number(delta.y()));
  m_viewer->scroll(m_lastPos - pos);
}
void PanTool::release(int row, int col, QMouseEvent *e) {
  // QToolTip::hideText();
}

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

#if QT_VERSION >= 0x050500
ScrollArea::ScrollArea(QWidget *parent, Qt::WindowFlags flags)
#else
ScrollArea::ScrollArea(QWidget *parent, Qt::WFlags flags)
#endif
    : QScrollArea(parent) {
  setFrameStyle(QFrame::Panel | QFrame::Raised);
  setLineWidth(6);
  setContentsMargins(10, 10, 10, 10);
}

ScrollArea::~ScrollArea() {}

void ScrollArea::keyPressEvent(QKeyEvent *e) { e->ignore(); }

void ScrollArea::wheelEvent(QWheelEvent *e) { e->ignore(); }

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

GenericPanel::GenericPanel(SpreadsheetViewer *viewer)
    : QWidget(viewer), m_viewer(viewer), m_dragTool(0) {
  setFocusPolicy(Qt::NoFocus);
}

GenericPanel::~GenericPanel() {}

void GenericPanel::paintEvent(QPaintEvent *e) {
  QPainter p(this);
  p.setPen(m_viewer->getLightLineColor());
  for (int c = 0;; c++) {
    int x = getViewer()->columnToX(c);
    if (x > width()) break;
    p.drawLine(x, 0, x, height());
  }
  for (int r = 0;; r++) {
    int y = getViewer()->rowToY(r);
    if (y > height()) break;
    p.drawLine(0, y, width(), y);
  }
  p.setPen(Qt::magenta);
  p.drawLine(e->rect().topLeft(), e->rect().bottomRight());
}

void GenericPanel::mousePressEvent(QMouseEvent *e) {
  assert(!m_dragTool);
  if (e->button() == Qt::MidButton)
    m_dragTool = new PanTool(this);
  else
    m_dragTool = createDragTool(e);

  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());
  int row                   = cellPosition.frame();
  int col                   = cellPosition.layer();
  if (m_dragTool) m_dragTool->click(row, col, e);
}

void GenericPanel::mouseReleaseEvent(QMouseEvent *e) {
  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());
  int row                   = cellPosition.frame();
  int col                   = cellPosition.layer();
  m_viewer->stopAutoPan();
  if (m_dragTool) {
    m_dragTool->release(row, col, e);
    delete m_dragTool;
    m_dragTool = 0;
  }
}

void GenericPanel::mouseMoveEvent(QMouseEvent *e) {
  CellPosition cellPosition = getViewer()->xyToPosition(e->pos());
  int row                   = cellPosition.frame();
  int col                   = cellPosition.layer();
  if (e->buttons() != 0 && m_dragTool != 0) {
    if ((e->buttons() & Qt::LeftButton) != 0 &&
        !visibleRegion().contains(e->pos())) {
      QRect bounds = visibleRegion().boundingRect();
      m_viewer->setAutoPanSpeed(bounds, e->pos());
    } else
      m_viewer->stopAutoPan();
    m_dragTool->drag(row, col, e);
  }
}

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

RowPanel::RowPanel(SpreadsheetViewer *viewer)
    : GenericPanel(viewer), m_xa(12) {}

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

DragTool *RowPanel::createDragTool(QMouseEvent *) {
  TFrameHandle *frameHandle = getViewer()->getFrameHandle();
  if (frameHandle)
    return new SetFrameDragTool(frameHandle);
  else
    return 0;
}

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

void RowPanel::drawRows(QPainter &p, int r0, int r1) {
  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);
  p.setFont(font);

  QRect visibleRect = visibleRegion().boundingRect();
  int x0            = visibleRect.left();
  int x1            = visibleRect.right();
  int y0            = visibleRect.top();
  int y1            = visibleRect.bottom();

  bool simpleView = getViewer()->getFrameZoomFactor() <=
                    Orientations::topToBottom()->dimension(
                        PredefinedDimension::SCALE_THRESHOLD);
  int r;
  int y = getViewer()->rowToY(r0);
  for (r = r0; r <= r1; r++) {
    int next_y = getViewer()->rowToY(r + 1);
    // draw horizontal line
    QColor color = (getViewer()->isMarkRow(r))
                       ? getViewer()->getMarkerLineColor()
                       : getViewer()->getLightLineColor();
    p.setPen(color);
    p.drawLine(x0, y, x1, y);

    if (simpleView && r > 0 && !getViewer()->isMarkRow(r + 1)) {
      y = next_y;
      continue;
    }

    // draw numbers
    p.setPen(getViewer()->getTextColor());

    QString number = QString::number(r + 1);
    p.drawText(QRect(x0, y + 1, width() - 4, next_y - y - 1),
               Qt::AlignVCenter | Qt::AlignRight, number);
    y = next_y;
  }
  // erase the marker interval at upper-end
  if (r0 == 0) {
    p.setPen(getViewer()->getLightLineColor());
    p.drawLine(x0, getViewer()->rowToY(0), x1, getViewer()->rowToY(0));
  }
}

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

void RowPanel::drawCurrentRowGadget(QPainter &p, int r0, int r1) {
  int currentRow = getViewer()->getCurrentRow();
  // int y          = getViewer()->rowToY(currentRow);
  if (currentRow < r0 || r1 < currentRow) return;
  int top    = getViewer()->rowToY(currentRow);
  int bottom = getViewer()->rowToY(currentRow + 1) - 1;
  QRect rect(1, top, width() - 1, bottom - top);

  p.fillRect(rect, getViewer()->getCurrentRowBgColor());
}

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

void RowPanel::paintEvent(QPaintEvent *e) {
  QRect toBeUpdated = e->rect();
  QPainter p(this);

  CellRange visible = getViewer()->xyRectToRange(toBeUpdated);
  // range of visible rows
  int r0 = visible.from().frame();
  int r1 = visible.to().frame();

  p.setClipRect(toBeUpdated);
  p.fillRect(toBeUpdated, QBrush(getViewer()->getLightLightBGColor()));

  drawCurrentRowGadget(p, r0, r1);
  drawRows(p, r0, r1);
}

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

ColumnPanel::ColumnPanel(SpreadsheetViewer *viewer) : GenericPanel(viewer) {}

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

CellPanel::CellPanel(SpreadsheetViewer *viewer) : GenericPanel(viewer) {}

DragTool *CellPanel::createDragTool(QMouseEvent *) {
  // FunctionSheetCellViewer::createDragTool is called instead
  // when clicking on the CellPanel in NumericalColumns
  return new SelectionDragTool(getViewer());
}

void CellPanel::paintEvent(QPaintEvent *e) {
  QPainter painter(this);

  QRect toBeUpdated = e->rect();
  painter.setClipRect(toBeUpdated);

  int x0 = toBeUpdated.left() - 1;
  int y0 = toBeUpdated.top();
  int x1 = toBeUpdated.right(), y1 = toBeUpdated.bottom();

  QRect alteredRect(QPoint(x0, y0), QPoint(x1, y1));
  CellRange cellRange = getViewer()->xyRectToRange(alteredRect);
  // visible rows range
  int r0 = cellRange.from().frame();
  int r1 = cellRange.to().frame();

  // visible columns range
  int c0 = cellRange.from().layer();
  int c1 = cellRange.to().layer();

  // cambia colore alle celle prima di rowCount()
  int rowCount = getViewer()->getRowCount();

  // fill with bg color
  painter.fillRect(toBeUpdated, getViewer()->getLightLightBGColor());

  // scene range bg
  int yLast = getViewer()->rowToY(rowCount);
  if (yLast < y1)
    painter.fillRect(x0, y0, x1 - x0, yLast - y0, getViewer()->getBGColor());
  else
    painter.fillRect(toBeUpdated, getViewer()->getBGColor());

  // draw cells
  drawCells(painter, r0, c0, r1, c1);

  // draw columns
  painter.setPen(getViewer()->getVerticalLineColor());
  for (int col = c0; col <= c1; col++) {
    int x = getViewer()->columnToX(col);
    painter.drawLine(x, y0, x, y1);
  }

  // draw rows
  int currentRow = getViewer()->getCurrentRow();
  for (int r = r0; r <= r1; r++) {
    int y        = getViewer()->rowToY(r);
    QColor color = getViewer()->isMarkRow(r) ? getViewer()->getMarkerLineColor()
                                             : getViewer()->getLightLineColor();
    painter.setPen(color);
    painter.drawLine(x0, y, x1, y);
  }
  // erase the marker interval at upper-end
  painter.setPen(getViewer()->getLightLineColor());
  painter.drawLine(x0, 0, x1, 0);
}

}  // namespace Spreadsheet

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

SpreadsheetViewer::SpreadsheetViewer(QWidget *parent)
    : QDialog(parent)
    , m_columnScrollArea(0)
    , m_rowScrollArea(0)
    , m_cellScrollArea(0)
    , m_frameHandle(0)
    , m_columnWidth(50)
    , m_rowHeight(20)
    , m_scaleFactor(100)
    , m_timerId(0)
    , m_autoPanSpeed(0, 0)
    , m_lastAutoPanPos(0, 0)
    , m_rowCount(0)
    , m_columnCount(0)
    , m_currentRow(0)
    , m_markRowDistance(6)
    , m_markRowOffset(0)
    , m_isComputingSize(false)
    , m_frameScroller() {
  // m_orientation = Orientations::topToBottom ();

  setFocusPolicy(Qt::NoFocus);

  // setFrameStyle(QFrame::StyledPanel);
  setObjectName("Viewer");

  // column header
  m_columnScrollArea = new Spreadsheet::ScrollArea;
  m_columnScrollArea->setObjectName("ScrollColumnArea");
  m_columnScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  m_columnScrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  m_columnScrollArea->setFocusPolicy(Qt::NoFocus);

  // row area
  m_rowScrollArea = new Spreadsheet::ScrollArea;
  m_rowScrollArea->setObjectName("ScrollRowArea");
  m_rowScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  m_rowScrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  m_rowScrollArea->setFocusPolicy(Qt::NoFocus);

  // cell area
  m_cellScrollArea = new Spreadsheet::ScrollArea;
  m_cellScrollArea->setObjectName("ScrollCellArea");
  m_cellScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  m_cellScrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
  // m_cellScrollArea->horizontalScrollBar()->setObjectName("XsheetScrollBar");
  // m_cellScrollArea->verticalScrollBar()->setObjectName("XsheetScrollBar");
  m_cellScrollArea->setFocusPolicy(Qt::NoFocus);

  m_columnScrollArea->setSizePolicy(
      QSizePolicy(QSizePolicy::Ignored, QSizePolicy::Fixed));
  m_rowScrollArea->setSizePolicy(
      QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Ignored));

  m_rowScrollArea->setFixedWidth(30);
  m_columnScrollArea->setFixedHeight(m_rowHeight * 3 - 4);
  // m_columnScrollArea->setFixedHeight(m_rowHeight * 3 + 60 - 63);

  m_frameScroller.setFrameScrollArea(m_cellScrollArea);
  connect(&m_frameScroller, &Spreadsheet::FrameScroller::prepareToScrollOffset,
          this, &SpreadsheetViewer::onPrepareToScrollOffset);
  connect(&m_frameScroller, &Spreadsheet::FrameScroller::zoomScrollAdjust, this,
          &SpreadsheetViewer::onZoomScrollAdjust);

  //---- layout
  QGridLayout *layout = new QGridLayout();
  layout->setMargin(0);
  layout->setSpacing(0);
  {
    layout->addWidget(m_columnScrollArea, 0, 1);
    layout->addWidget(m_rowScrollArea, 1, 0);
    layout->addWidget(m_cellScrollArea, 1, 1, 2, 2);

    int scrollBarWidth = 16;
    // upper-right
    QWidget *w = new QWidget(this);
    w->setFixedWidth(scrollBarWidth);
    w->setFixedHeight(m_columnScrollArea->height());
    layout->addWidget(w, 0, 2);

    // lower-left
    w = new QWidget(this);
    w->setFixedSize(QSize(30, scrollBarWidth));
    layout->addWidget(w, 2, 0);

    layout->setColumnStretch(0, 0);
    layout->setColumnStretch(1, 1);
    layout->setColumnStretch(2, 0);
    layout->setRowStretch(0, 0);
    layout->setRowStretch(1, 1);
    layout->setRowStretch(2, 0);
  }
  setLayout(layout);

  //---signal-slot connections

  // vertical slider: cell <=> row
  connect(m_rowScrollArea->verticalScrollBar(), SIGNAL(valueChanged(int)),
          m_cellScrollArea->verticalScrollBar(), SLOT(setValue(int)));
  connect(m_cellScrollArea->verticalScrollBar(), SIGNAL(valueChanged(int)),
          m_rowScrollArea->verticalScrollBar(), SLOT(setValue(int)));

  // horizontal slider: cell <=> column
  connect(m_columnScrollArea->horizontalScrollBar(), SIGNAL(valueChanged(int)),
          m_cellScrollArea->horizontalScrollBar(), SLOT(setValue(int)));
  connect(m_cellScrollArea->horizontalScrollBar(), SIGNAL(valueChanged(int)),
          m_columnScrollArea->horizontalScrollBar(), SLOT(setValue(int)));

  connect(m_cellScrollArea->verticalScrollBar(), SIGNAL(valueChanged(int)),
          SLOT(onVSliderChanged(int)));
  connect(m_cellScrollArea->horizontalScrollBar(), SIGNAL(valueChanged(int)),
          SLOT(onHSliderChanged(int)));
}

SpreadsheetViewer::~SpreadsheetViewer() {}

void SpreadsheetViewer::setFrameHandle(TFrameHandle *frameHandle) {
  if (m_frameHandle == frameHandle) return;
  if (m_frameHandle) m_frameHandle->disconnect(this);
  m_frameHandle = frameHandle;

  if (isVisible() && m_frameHandle) {
    connect(m_frameHandle, SIGNAL(frameSwitched()), this,
            SLOT(onFrameSwitched()));
    update();
  }
}

void SpreadsheetViewer::setRowsPanel(Spreadsheet::RowPanel *rows) {
  m_rowScrollArea->setWidget(rows);
}

void SpreadsheetViewer::setColumnsPanel(Spreadsheet::ColumnPanel *columns) {
  m_columnScrollArea->setWidget(columns);
  // columns->setFixedHeight(200);
}

void SpreadsheetViewer::setCellsPanel(Spreadsheet::CellPanel *cells) {
  m_cellScrollArea->setWidget(cells);
}

void SpreadsheetViewer::setButtonAreaWidget(QWidget *widget) {
  QGridLayout *lay = dynamic_cast<QGridLayout *>(layout());
  lay->addWidget(widget, 0, 0);
}

void SpreadsheetViewer::setRowCount(int rowCount) {
  if (m_rowCount != rowCount) {
    m_rowCount = rowCount;
    refreshContentSize(0, 0);
  }
}

void SpreadsheetViewer::setColumnCount(int columnCount) {
  if (m_columnCount != columnCount) {
    m_columnCount = columnCount;
    refreshContentSize(0, 0);
  }
}

void SpreadsheetViewer::scroll(QPoint delta) {
  int x = delta.x();
  int y = delta.y();

  QScrollBar *hSc = m_cellScrollArea->horizontalScrollBar();
  QScrollBar *vSc = m_cellScrollArea->verticalScrollBar();

  int valueH    = hSc->value() + x;
  int valueV    = vSc->value() + y;
  int maxValueH = hSc->maximum();
  int maxValueV = vSc->maximum();

  bool notUpdateSizeH = maxValueH > valueH && x >= 0;
  bool notUpdateSizeV = maxValueV > valueV && y >= 0;
  if ((!notUpdateSizeH) && (!notUpdateSizeV))
    refreshContentSize(x, y);
  else if (notUpdateSizeH && !notUpdateSizeV)
    refreshContentSize(0, y);
  else if (!notUpdateSizeH && notUpdateSizeV)
    refreshContentSize(x, 0);

  // Recheck in case refreshContentSize changed the max
  if (!notUpdateSizeH) maxValueH = hSc->maximum();
  if (!notUpdateSizeV) maxValueV = vSc->maximum();

  if (valueH > maxValueH && x > 0) valueH = hSc->maximum();

  if (valueV > maxValueV && y > 0) valueV = vSc->maximum();

  hSc->setValue(valueH);
  vSc->setValue(valueV);
}

void SpreadsheetViewer::onPrepareToScrollOffset(const QPointF &offset) {
  refreshContentSize((int)offset.x(), (int)offset.y());
}

void SpreadsheetViewer::onZoomScrollAdjust(QPointF &offset, bool toZoom) {
  double frameZoomFactor = (double)getFrameZoomFactor();

  // toZoom = true: Adjust standardized offset down to zoom factor
  // toZoom = false: Adjust zoomed offset up to standardized offset
  double newY;
  if (toZoom)
    newY = (offset.y() * frameZoomFactor) / 100.0;
  else
    newY = (offset.y() * 100.0) / frameZoomFactor;

  offset.setY(newY);
}

void SpreadsheetViewer::setAutoPanSpeed(const QPoint &speed) {
  bool wasAutoPanning = isAutoPanning();
  m_autoPanSpeed      = speed;
  if (isAutoPanning() && !wasAutoPanning && m_timerId == 0)
    m_timerId = startTimer(40);
  else if (!isAutoPanning() && wasAutoPanning && m_timerId != 0) {
    killTimer(m_timerId);
    m_timerId = 0;
  }
}

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

static int getAutoPanSpeed(int pixels) {
  int f = 40;
  return std::min(100, (f - 1 + pixels * f) / 100);
}

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

void SpreadsheetViewer::setAutoPanSpeed(const QRect &widgetBounds,
                                        const QPoint &mousePos) {
  QPoint speed;
  int limit = 100, factor = 30;
  if (mousePos.x() < widgetBounds.left())
    speed.setX(-getAutoPanSpeed(widgetBounds.left() - mousePos.x()));
  else if (mousePos.x() > widgetBounds.right())
    speed.setX(getAutoPanSpeed(mousePos.x() - widgetBounds.right()));
  if (mousePos.y() < widgetBounds.top())
    speed.setY(-getAutoPanSpeed(widgetBounds.top() - mousePos.y()));
  else if (mousePos.y() > widgetBounds.bottom())
    speed.setY(getAutoPanSpeed(mousePos.y() - widgetBounds.bottom()));
  setAutoPanSpeed(speed);
  m_lastAutoPanPos = mousePos;
}

int SpreadsheetViewer::xToColumn(int x) const {
  CellPosition pos = xyToPosition(QPoint(x, 0));
  return pos.layer();
}
int SpreadsheetViewer::yToRow(int y) const {
  CellPosition pos = xyToPosition(QPoint(0, y));
  return pos.frame();
}
int SpreadsheetViewer::columnToX(int col) const {
  QPoint xy = positionToXY(CellPosition(0, col));
  return xy.x();
}
int SpreadsheetViewer::rowToY(int row) const {
  QPoint xy = positionToXY(CellPosition(row, 0));
  return xy.y();
}

/*!Shift is a consequence of style sheet border.*/
CellPosition SpreadsheetViewer::xyToPosition(const QPoint &point) const {
  int row = (point.y() * 100 / m_scaleFactor) / m_rowHeight;
  int col = (point.x()) / m_columnWidth;
  return CellPosition(row, col);
}

/*!Shift is a consequence of style sheet border.*/
QPoint SpreadsheetViewer::positionToXY(const CellPosition &pos) const {
  int x = (pos.layer() * m_columnWidth);
  int y = pos.frame() * m_rowHeight * m_scaleFactor / 100;
  // int y = (pos.frame() * m_rowHeight * m_scaleFactor / 100) - 1;
  return QPoint(x, y);
}

CellRange SpreadsheetViewer::xyRectToRange(const QRect &rect) const {
  CellPosition topLeft     = xyToPosition(rect.topLeft());
  CellPosition bottomRight = xyToPosition(rect.bottomRight());
  return CellRange(topLeft, bottomRight);
}

bool SpreadsheetViewer::refreshContentSize(int scrollDx, int scrollDy) {
  QSize viewportSize = m_cellScrollArea->viewport()->size();
  QPoint offset      = m_cellScrollArea->widget()->pos();
  offset             = QPoint(std::min(0, offset.x() - scrollDx),
                  std::min(0, offset.y() - scrollDy));

  QSize contentSize(columnToX(m_columnCount + 1), rowToY(m_rowCount + 1));

  QSize actualSize(contentSize);
  int x = viewportSize.width() - offset.x();
  int y = viewportSize.height() - offset.y();
  if (x > actualSize.width()) actualSize.setWidth(x);
  if (y > actualSize.height()) actualSize.setHeight(y);

  if (actualSize == m_cellScrollArea->widget()->size())
    return false;
  else {
    m_isComputingSize = true;
    m_cellScrollArea->widget()->setFixedSize(actualSize);
    m_rowScrollArea->widget()->setFixedSize(
        m_rowScrollArea->viewport()->width(), actualSize.height());
    m_columnScrollArea->widget()->setFixedSize(
        actualSize.width(), m_columnScrollArea->viewport()->height());
    m_isComputingSize = false;

    return true;
  }
}

void SpreadsheetViewer::showEvent(QShowEvent *) {
  int viewportHeight = m_cellScrollArea->height();
  int contentHeight  = rowToY(m_rowCount * 0 + 50);
  QScrollBar *vSc    = m_cellScrollArea->verticalScrollBar();
  int actualContentHeight =
      std::max(contentHeight, vSc->value() + viewportHeight);
  m_rowScrollArea->widget()->setFixedSize(m_rowScrollArea->viewport()->width(),
                                          actualContentHeight);
  m_cellScrollArea->widget()->setFixedHeight(actualContentHeight);
  if (m_frameHandle)
    connect(m_frameHandle, SIGNAL(frameSwitched()), this,
            SLOT(onFrameSwitched()));

  // updateAreasSize();
}

void SpreadsheetViewer::hideEvent(QHideEvent *) {
  if (m_frameHandle) m_frameHandle->disconnect(this);
}

void SpreadsheetViewer::resizeEvent(QResizeEvent *e) {
  QDialog::resizeEvent(e);
  refreshContentSize(0, 0);
  /*
  int w = width();
  int h = height();

int hSpacing = 4;
int vSpacing = 4;

int x = m_rowScrollAreaWidth + hSpacing;
int y = m_columnScrollAreaHeight + vSpacing;

  m_cellScrollArea->setGeometry(x,y, w-x, h-y);

int sh = m_cellScrollArea->horizontalScrollBar()->height();
int sw = m_cellScrollArea->verticalScrollBar()->width();

  m_columnScrollArea->setGeometry(x, 0, w-x-sw, m_columnScrollAreaHeight);
m_rowScrollArea->setGeometry(0, y, m_rowScrollAreaWidth, h-y-sh);

updateSizeToScroll(0,0); //Non updateAreeSize() perche' si deve tener conto
degli scrollbar.
*/
}

void SpreadsheetViewer::wheelEvent(QWheelEvent *event) {
  switch (event->source()) {
  case Qt::MouseEventNotSynthesized: {
    if (event->angleDelta().x() == 0) {  // vertical scroll
      int scrollPixels = (event->angleDelta().y() > 0 ? 1 : -1) *
                         m_markRowDistance * m_rowHeight;
      scroll(QPoint(0, -scrollPixels));
    } else {  // horizontal scroll
      int scrollPixels = (event->angleDelta().x() > 0 ? 1 : -1) * m_columnWidth;
      scroll(QPoint(-scrollPixels, 0));
    }
    break;
  }

  case Qt::MouseEventSynthesizedBySystem:  // macbook touch-pad
  {
    QPoint numPixels  = event->pixelDelta();
    QPoint numDegrees = event->angleDelta() / 8;
    if (!numPixels.isNull()) {
      scroll(-numPixels);
    } else if (!numDegrees.isNull()) {
      QPoint numSteps = numDegrees / 15;
      scroll(-numSteps);
    }
    break;
  }

  default:  // Qt::MouseEventSynthesizedByQt,
            // Qt::MouseEventSynthesizedByApplication
  {
    std::cout << "not supported wheelEvent.source(): "
                 "Qt::MouseEventSynthesizedByQt, "
                 "Qt::MouseEventSynthesizedByApplication"
              << std::endl;
    break;
  }

  }  // end switch
}

void SpreadsheetViewer::timerEvent(QTimerEvent *e) {
  if (!isAutoPanning()) return;
  scroll(m_autoPanSpeed);
  m_lastAutoPanPos += m_autoPanSpeed;
  /*
if(m_dragTool)
{
QMouseEvent mouseEvent(QEvent::MouseMove, m_lastAutoPanPos, Qt::NoButton, 0, 0);
m_dragTool->onDrag(&mouseEvent);
}
*/
}

void SpreadsheetViewer::keyPressEvent(QKeyEvent *e) {
  int frameCount = m_rowCount;
  int row        = m_frameHandle->getFrame();

  if (e->key() == Qt::Key_Up &&
      row > 0) {  // Row = frame precedente a quello settato
    m_frameHandle->setFrame(row - 1);
    return;
  } else if (e->key() ==
             Qt::Key_Down) {  // Row = frame successivo a quello settato
    m_frameHandle->setFrame(row + 1);
    return;
  } else if (e->key() == '0') {
    QWidget *panel       = parentWidget();
    QWidget *panelParent = panel->parentWidget();
    while (panelParent != 0 && dynamic_cast<QMainWindow *>(panelParent) == 0) {
      panel       = panelParent;
      panelParent = panel->parentWidget();
    }
    if (panelParent) {
      QList<QDockWidget *> panels = panelParent->findChildren<QDockWidget *>();
      for (int i = 0; i < panels.size(); i++) {
        QWidget *w = panels[i];
      }
    }
    return;
  }

  int y = 0;
  QRect visibleRect =
      m_cellScrollArea->widget()->visibleRegion().boundingRect();
  int visibleRowCount = visibleRect.height() / m_rowHeight;
  if (e->key() ==
      Qt::Key_PageUp)  // Setto la visualizzazione della pagina precedente
    y = visibleRect.top() - (visibleRowCount + 1) * m_rowHeight;
  else if (e->key() == Qt::Key_PageDown)  // Setto la visualizzazione della
                                          // pagina successiva
    y = visibleRect.bottom() + (visibleRowCount + 1) * m_rowHeight;
  else if (e->key() == Qt::Key_Home)
    y = 0;
  else if (e->key() == Qt::Key_End)
    y = (frameCount + 1) * m_rowHeight;
  else
    return;

  int deltaY = 0;
  if (y < visibleRect.top())
    deltaY = y - visibleRect.top();
  else
    deltaY = y - visibleRect.bottom();
  scroll(QPoint(0, deltaY));
}

void SpreadsheetViewer::frameSwitched() {}

/*
void SpreadsheetViewer::updateAllAree()
{
}

void SpreadsheetViewer::updateCellColumnAree()
{
}

void SpreadsheetViewer::updateCellRowAree()
{
}

*/

void SpreadsheetViewer::updateAreas() {}

void SpreadsheetViewer::onVSliderChanged(int) {
  if (!m_isComputingSize) refreshContentSize(0, 0);
  /*
QScrollBar *vSc = m_cellScrollArea->verticalScrollBar();
int h = qMax(vSc->value() + m_cellScrollArea->height(), rowToY(getRowCount()));
if(m_cellScrollArea->widget())
m_cellScrollArea->widget()->setFixedHeight(h);
if(m_rowScrollArea->widget())
m_rowScrollArea->widget()->setFixedHeight(h);
*/

  /*
int viewportHeight = m_cellScrollArea->height();
int contentHeight = rowToY(m_rowCount*0 + 50);
QScrollBar *vSc = m_cellScrollArea->verticalScrollBar();
int actualContentHeight = qMax(contentHeight, vSc->value() + viewportHeight);
m_rowScrollArea->widget()->setFixedHeight(actualContentHeight);
m_cellScrollArea->widget()->setFixedHeight(actualContentHeight);
*/
}

void SpreadsheetViewer::onHSliderChanged(int) {
  if (!m_isComputingSize) refreshContentSize(0, 0);
}

void SpreadsheetViewer::ensureVisibleCol(int col) {
  int x = columnToX(col) + m_columnWidth / 2;

  int vertValue = m_cellScrollArea->verticalScrollBar()->value();
  m_cellScrollArea->ensureVisible(x, vertValue, m_columnWidth / 2, 0);
}