setCrosshairPosition method

void setCrosshairPosition(Offset? position)

Updates crosshair position and extracts hovered candle under pointer.

Implementation

void setCrosshairPosition(Offset? position) {
  if (!_showCrosshair) {
    _crosshairPosition = null;
    if (_syncGroup != null && !_isReceivingSync) {
      _syncGroup!.clearCrosshair(source: this);
    }
    return;
  }
  _crosshairPosition = position;
  if (position != null && candles.isNotEmpty) {
    final converter = CoordinateConverter(
      viewport: _viewport,
      totalCandles: candles.length,
    );
    final index = converter.xToIndex(position.dx);
    if (index >= 0 && index < candles.length) {
      _hoveredCandle = candles[index];
    }
  } else {
    _hoveredCandle = null;
  }

  if (_syncGroup != null && !_isReceivingSync) {
    final hoveredTime = _hoveredCandle?.timestamp;
    final yRatio = (position != null && _viewport.viewportHeight > 0)
        ? (position.dy / _viewport.viewportHeight).clamp(0.0, 1.0)
        : null;
    _syncGroup!.broadcastCrosshair(
      source: this,
      timestamp: hoveredTime,
      yPriceRatio: yRatio,
    );
  }
  notifyListeners();
}