onScaleUpdate method
Implementation
@override
void onScaleUpdate(Vector2 position, double scale) {
if (setZoom == null && isInsideBounds(position)) {
if (_zoomStart == null) onScaleStart(position);
zoom = _zoomStart! * scale;
zoom = zoom.clamp(minZoom, maxZoom);
childPreBuild?.updateData(bounds / zoom, context!, this);
}
}