SizeUnit class abstract

Abstract base class for size units used in flexbox layouts.

Size units define how the size of an element is calculated relative to its content, container, or other layout constraints. They provide a flexible way to specify dimensions that can adapt to different contexts.

Size units are computed after the viewport size has been reduced by padding, giving them access to the actual available space for content.

Common size units include:

Fixed sizes (fixed)
Content-based sizes (minContent, maxContent, fitContent)
Viewport-relative sizes (viewportSize)

Available extensions

SizeUnitExtension

Constructors

SizeUnit.new(): const
SizeUnit.fixed(double value): Creates a fixed size with the specified value.
const

factory

Properties

hashCode → int: The hash code for this object.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

clamp({SizeUnit min = const _FixedSize(0), SizeUnit max = const _FixedSize(double.infinity)}) → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Constrains this size unit within the specified min and max bounds.
computeSize({required ParentLayout parent, required ChildLayout child, required LayoutHandle<Layout> layoutHandle, required LayoutAxis axis, required LayoutSize contentSize, required LayoutSize viewportSize}) → double: Computes the actual size value for this unit.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited

Operators

operator *(SizeUnit other) → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Multiplies two size units.
operator +(SizeUnit other) → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Adds two size units together.
operator -(SizeUnit other) → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Subtracts one size unit from another.
operator /(SizeUnit other) → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Divides one size unit by another.
operator ==(Object other) → bool: The equality operator.
inherited
operator unary-() → SizeUnit: Available on SizeUnit, provided by the SizeUnitExtension extension
Negates this size unit (equivalent to 0 - this).

Static Methods

lerp(SizeUnit a, SizeUnit b, double t) → SizeUnit: Linearly interpolates between two size units.

Constants

fitContent → const SizeUnit: Sizes to fit the content with constraints.
maxContent → const SizeUnit: Sizes to the maximum content size (expand to fit).
minContent → const SizeUnit: Sizes to the minimum content size (shrink-wrapped).
viewportSize → const SizeUnit: Sizes to match the viewport size.
zero → const SizeUnit: A size of zero.