BoxAlignmentSpacing class

Spacing-based box alignment for distributing items with gaps.

BoxAlignmentSpacing controls how items are distributed within a container by specifying spacing ratios at the start and end. This enables layouts like space-between, space-around, and space-evenly.

The aroundStart and aroundEnd values determine how much space is added before the first item and after the last item relative to the space between items. For example, space-around uses 0.5 for both, while space-evenly uses 1.0.

See also:

• BoxAlignment, for fixed position alignment
• BoxAlignmentDirectional, for text-direction-aware alignment

Inheritance

• Object
• BoxAlignmentGeometry
• BoxAlignmentContent
• BoxAlignmentBase
• BoxAlignmentSpacing

Constructors

BoxAlignmentSpacing(double aroundStart, double aroundEnd)

Creates an even spacing alignment with custom start and end ratios.

const

BoxAlignmentSpacing.around()

Creates space-around alignment: equal space around each item.

const

BoxAlignmentSpacing.aroundSymmetric(double ratio)

Creates symmetric space-around with a custom ratio.

const

BoxAlignmentSpacing.between()

Creates space-between alignment: equal space between items, no space at edges.

const

BoxAlignmentSpacing.even()

Creates space-evenly alignment: equal space between and around all items.

const

Properties

aroundEnd → double

The spacing ratio at the end (after last item).

final

aroundStart → double

The spacing ratio at the start (before first item).

final

hashCode → int

The hash code for this object.

no setter, override

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})?

Calculates additional spacing to distribute remaining space evenly.

override

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

Even spacing alignments position items at their natural positions (offset 0). The spacing adjustments are handled by adjustSpacing.

override

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

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

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override