Size _sizeForConstraints(BoxConstraints constraints)
{
constraints = BoxConstraints.tightFor(
_width,
_height
).enforce(constraints);
if (_image == null)
{
return(constraints.smallest);
}
return(constraints.constrainSizeAndAttemptToPreserveAspectRatio(new Size(
(_image.width / _scale),
(_image.height / _scale)
)));
}