BoxConstraints

Box 的大小必须满足的约束条件。

当且仅当满足以下全部关系时，一个 Size 才符合 BoxConstraints 的约束：

min_width <= Size.width <= max_width min_height <= Size.height <= max_height

有关 BoxConstraints 的更多说明，请见 此处。

属性

名称	类型	默认值	说明
min_width	Number	0	The minimum width that satisfies the constraints, such that 0.0 <= min_width <= max_width.
min_height	Number	0	The minimum height that satisfies the constraints, such that 0.0 <= min_height <= max_height.
max_width	Number	float('inf'	The maximum width that satisfies the constraints, such that min_width <= max_width <= float("inf").
max_height	Number	float('inf'	The maximum height that satisfies the constraints, such that min_height <= max_height <= float("inf").

方法

名称	类型	默认值	说明
copy	'BoxConstraints'	—	返回此对象的副本，可覆盖指定属性。