private void _handleOnScaleUpdate(ScaleUpdateDetails details)
{
setState(() =>
{
_scale = (_previousScale * details.scale).clamp(1.0f, 4.0f);
_offset = _clampOffset(details.focalPoint - _normalizedOffset * _scale);
});
}
void _onScaleUpdate(ScaleUpdateDetails scaleUpdateDetails)
{
this._setScaleAndPosition(
this._initialScale * scaleUpdateDetails.scale,
this._clampPosition(
this._screenToFractional(offset: scaleUpdateDetails.focalPoint) -
this._initialPosition * scaleUpdateDetails.scale,
this._initialScale * scaleUpdateDetails.scale)
);
this._panning = scaleUpdateDetails.scale == 1;
}
