resolveTuiWheelReportCount function

int resolveTuiWheelReportCount(TuiWheelEvent event, { required num multiplier, required TuiWheelDistanceState state, double? cellHeight, int? rows, bool forceTrackpad = false, })

Resolve how many TUI mouse-wheel reports to emit for event.

Port of Orca resolveTerminalTuiMouseWheelReportCount.

forceTrackpad: treat event as a pixel trackpad stream even when |deltaY| exceeds the discrete notch threshold (used when coalescing many small trackpad ticks into one ingest).

Implementation

int resolveTuiWheelReportCount(
  TuiWheelEvent event, {
  required num multiplier,
  required TuiWheelDistanceState state,
  double? cellHeight,
  int? rows,
  bool forceTrackpad = false,
}) {
  final direction = _resolveWheelDirection(event);
  if (state.pendingDirection != 0 && state.pendingDirection != direction) {
    state.fastStreak = 0;
    state.lastDistanceRows = null;
    state.lastInputAt = null;
    state.pendingRows = 0;
  }
  state.pendingDirection = direction;

  final distanceRows = forceTrackpad
      ? event.deltaY.abs() / _normalizeCellHeight(cellHeight)
      : _resolveWheelDistanceRows(
          event,
          cellHeight: cellHeight,
          rows: rows,
        );
  if (forceTrackpad || _isTrackpadLikePixelWheelEvent(event)) {
    final totalRows = state.pendingRows + distanceRows;
    final reports = totalRows.truncate();
    state.pendingRows = totalRows - reports;
    return reports;
  }

  final scaledRows = math.min(
        _tuiWheelBurstMaxDistanceRowsPerEvent,
        _compressWheelDistanceRows(distanceRows) +
            _resolveBurstWheelDistanceRows(event, state, distanceRows),
      ) *
      normalizeTuiScrollSensitivity(multiplier);
  final totalRows = state.pendingRows + scaledRows;
  final reports = totalRows.truncate();
  state.pendingRows = totalRows - reports;
  return reports;
}