private void _handleOnScaleStart(ScaleStartDetails details)
{
setState(() =>
{
_previousScale = _scale;
_normalizedOffset = (details.focalPoint - _offset) / _scale;
_controller.stop();
});
}
void _onScaleStart(ScaleStartDetails scaleStartDetails)
{
this._initialScale = this._scale;
this._initialPosition = this._screenToFractional(offset: scaleStartDetails.focalPoint) - this._position;
this._scaling = true;
}
