BoxAlignmentContent class abstract

Abstract base class for alignment geometries that support stretch and fixed alignments but not baseline.

This class is designed for cross-axis alignment in flex containers, particularly for the align-content property which controls how multiple lines of flex items are aligned within the container. Unlike BoxAlignmentGeometry, it cannot handle baseline alignment but supports stretch alignment and all fixed alignments.

Cross-axis alignment controls how flex items are positioned perpendicular to the main layout axis. For horizontal flex containers, this affects vertical positioning. For vertical containers, it affects horizontal positioning.

The stretch alignment allows items to expand to fill available space, while fixed alignments (start, center, end) position items at specific locations. Spacing alignments distribute space between and around items.

Inheritance

• Object
• BoxAlignmentGeometry
• BoxAlignmentContent

Implementers

• BoxAlignmentBase

Constructors

BoxAlignmentContent.new()

const

BoxAlignmentContent.absolute(double value)

Creates an absolute alignment with a custom value.

const

factory

BoxAlignmentContent.directional(double value)

Creates a directional alignment with a custom value.

const

factory

BoxAlignmentContent.spaceAroundRatio(double startRatio, double endRatio)

Creates custom spacing ratios for start and end.

const

factory

BoxAlignmentContent.spaceAroundSymmetric(double ratio)

Creates symmetric spacing around items with a custom ratio.

const

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

adjustSize({required ParentLayout parent, required LayoutAxis axis, required double viewportSize, required double contentSize}) → double?

Optionally adjusts the size of the child during alignment.

inherited

adjustSpacing({required ParentLayout parent, required LayoutAxis axis, required double viewportSize, required double contentSize, required double startSpacing, required double spacing, required double endSpacing, required int affectedCount}) → ({double additionalEndSpacing, double additionalSpacing, double additionalStartSpacing})?

Adjusts spacing between items when distributing space.

align({required ParentLayout parent, required LayoutAxis axis, required double viewportSize, required double contentSize, required double maxBaseline, required double childBaseline}) → double

Calculates the alignment position for a child within its parent container.

inherited

needsBaseline({required ParentLayout parent, required LayoutAxis axis}) → bool

Determines if this alignment requires baseline information.

inherited

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 ==(Object other) → bool

The equality operator.

inherited

Constants

center → const BoxAlignmentContent

Centers items along the cross-axis.

end → const BoxAlignmentContent

Aligns items to the end of the cross-axis.

spaceAround → const BoxAlignmentContent

Distributes items with equal space around each item.

spaceBetween → const BoxAlignmentContent

Distributes items with equal space between them, no space at the edges.

spaceEvenly → const BoxAlignmentContent

Distributes items with equal space between and around them.

start → const BoxAlignmentContent

Aligns items to the start of the cross-axis.

stretch → const BoxAlignmentContent

Stretches items to fill the available cross-axis space.