isUniform property
Whether all four sides of the border are identical. Uniform borders are typically more efficient to paint.
A uniform border by definition has no text direction dependency and therefore could be expressed as a Border, even if it is currently a BorderDirectional. A uniform border can also be expressed as a RoundedRectangleBorder.
Implementation
@override
bool get isUniform =>
_colorIsUniform &&
_widthIsUniform &&
_styleIsUniform &&
_typeIsUniform &&
_rBorderSideIsUniform;