onVerticalPan method

void onVerticalPan(
  1. double deltaY,
  2. double paneHeight
)

Vertical pan when manual price scaling is active.

Implementation

void onVerticalPan(double deltaY, double paneHeight) {
  if (paneHeight <= 0) return;
  final normalizedDelta = deltaY / paneHeight;
  _verticalPan += normalizedDelta * _verticalScale;
  notifyListeners();
}