BoxAlignmentBase class abstract

Abstract base class for alignment geometries that don't support baseline or stretch.

This class is specifically designed for main-axis alignment in flex containers. Unlike BoxAlignmentGeometry, it cannot handle baseline alignment (which requires text baseline information) or stretch alignment (which modifies child sizes).

Main-axis alignment controls how flex items are distributed along the primary layout axis (horizontal for rows, vertical for columns). It includes fixed alignments (start, center, end) and spacing alignments (space-between, space-evenly, etc.).

Use this class when you need to align items along the main axis without baseline considerations or size stretching.

Inheritance

• Object
• BoxAlignmentGeometry
• BoxAlignmentContent
• BoxAlignmentBase

Implementers

• BoxAlignment
• BoxAlignmentDirectional
• BoxAlignmentSpacing

Constructors

BoxAlignmentBase()

Creates a constant box alignment base.

const

BoxAlignmentBase.absolute(double value)

Creates an absolute alignment with a custom value.

const

factory

BoxAlignmentBase.directional(double value)

Creates a directional alignment with a custom value.

const

factory

BoxAlignmentBase.spaceAroundRatio(double startRatio, double endRatio)

Creates custom spacing ratios for start and end.

const

factory

BoxAlignmentBase.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, required double childSize}) → 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.

inherited

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

This alignment never requires baseline information since it doesn't support baseline alignment.

override

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 BoxAlignmentBase

Centers items along the main axis.

end → const BoxAlignmentBase

Aligns items to the end of the main axis.

spaceAround → const BoxAlignmentBase

Distributes items with equal space around each item.

spaceBetween → const BoxAlignmentBase

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

spaceEvenly → const BoxAlignmentBase

Distributes items with equal space between and around them.

start → const BoxAlignmentBase

Aligns items to the start of the main axis.