BorderSide

创建边框的一条边。

默认情况下，边框宽 1.0 个逻辑像素，颜色为纯黑色。

要省略（不显示）某条边，可将 style 设为 NONE。此时会跳过边框绘制，但该边仍保留 width。

属性

名称	类型	默认值	说明
width	Number	1.0	The width of this side of the border, in logical pixels. Setting width to 0.0 will result in a hairline border. This means that the border will have the width of one physical pixel. Hairline rendering takes shortcuts when the path overlaps a pixel more than once. This means that it will render faster than otherwise, but it might double-hit pixels, giving it a slightly darker/lighter result. Tip: To omit the border entirely, set the style to NONE. Raises: ValueError: If it is not greater than or equal to 0.
color	ColorValue	Colors.BLACK	The color of this side of the border.
stroke_align	'BorderSideStrokeAlignValue'	BorderSideStrokeAlign.INSIDE	The relative position of the stroke on a BorderSide in an OutlinedBorder or Border.
style	BorderStyle	BorderStyle.SOLID	The style of this side of the border.

只读属性

名称	类型	默认值	说明
stroke_inset	—	—	The amount of the stroke width that lies inside this BorderSide. For example, this will return the width for a stroke_align of -1, half the width for a stroke_align of 0, and 0 for a stroke_align of 1.
stroke_outset	—	—	The amount of the stroke width that lies outside this BorderSide. For example, this will return 0 for a stroke_align of -1, half the width for a stroke_align of 0, and the width for a stroke_align of 1.
stroke_offset	—	—	The offset of the stroke, taking into account the stroke alignment. For example, this will return the negative width of the stroke for a stroke_align of -1, 0 for a stroke_align of 0, and the width for a stroke_align of -1.

方法

名称	类型	默认值	说明
copy	'BorderSide'	—	返回此对象的副本，可覆盖指定属性。
none	'BorderSide'	—	Creates a border side that is not rendered. Returns: A hairline black BorderSide with style set to NONE.