BorderSide class Null safety

A side of a border of a box.

A Border consists of four BorderSide objects: Border.top, Border.left, Border.right, and Border.bottom.

Note that setting BorderSide.width to 0.0 will result in hairline rendering. A more involved explanation is present in BorderSide.width.

link
This sample shows how BorderSide objects can be used in a Container, via a BoxDecoration and a Border, to decorate some Text. In this example, the text has a thick bar above it that is light blue, and a thick bar below it that is a darker shade of blue. 
Container(
  padding: const EdgeInsets.all(8.0),
  decoration: BoxDecoration(
    border: Border(
      top: BorderSide(width: 16.0, color: Colors.lightBlue.shade50),
      bottom: BorderSide(width: 16.0, color: Colors.lightBlue.shade900),
    ),
  ),
  child: const Text('Flutter in the sky', textAlign: TextAlign.center),
)

See also:

Implementers
Annotations

Constructors

BorderSide({Color color = const Color(0xFF000000), double width = 1.0, BorderStyle style = BorderStyle.solid, StrokeAlign strokeAlign = StrokeAlign.inside})
Creates the side of a border.
const

Properties

color → Color
The color of this side of the border.
final
hashCode → int
The hash code for this object.
read-onlyoverride
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
strokeAlign → StrokeAlign
The direction of where the border will be drawn relative to the container.
final
style → BorderStyle
The style of this side of the border.
final
width → double
The width of this side of the border, in logical pixels.
final

Methods

copyWith({Color? color, double? width, BorderStyle? style}) → BorderSide
Creates a copy of this border but with the given fields replaced with the new values.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
scale(double t) → BorderSide
Creates a copy of this border side description but with the width scaled by the factor t.
toPaint() → Paint
Create a Paint object that, if used to stroke a line, will draw the line in this border's style.
toString() → String
A string representation of this object.
override

Operators

operator ==(Object other) → bool
The equality operator.
override

Static Methods

canMerge(BorderSide a, BorderSide b) → bool
Whether the two given BorderSides can be merged using BorderSide.merge.
lerp(BorderSide a, BorderSide b, double t) → BorderSide
Linearly interpolate between two border sides.
merge(BorderSide a, BorderSide b) → BorderSide
Creates a BorderSide that represents the addition of the two given BorderSides.

Constants

none → const BorderSide
A hairline black border that is not rendered.
BorderSide(width: 0.0, style: BorderStyle.none)