BoxAlignmentDirectional class

Text-direction-aware box alignment that adapts to locale.

BoxAlignmentDirectional provides alignment positioning that respects the text direction (LTR/RTL) of the current locale. For example, 'start' means left in LTR languages but right in RTL languages like Arabic or Hebrew.

This is the preferred alignment type when building internationalized UIs that need to adapt to different reading directions. The alignment values automatically flip for RTL contexts.

See also:

• BoxAlignment, for fixed alignment that ignores text direction
• BoxAlignmentSpacing, for spacing-based alignment

Inheritance

• Object
• BoxAlignmentGeometry
• BoxAlignmentContent
• BoxAlignmentBase
• BoxAlignmentDirectional

Constructors

BoxAlignmentDirectional(double value)

Creates a directional alignment with the specified value.

const

Properties

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

value → double

The alignment value, where -1.0 is start, 0.0 is center, and 1.0 is end.

final

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 based on the value and text direction.

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

Constants

baseline → const BoxAlignmentGeometry

Aligns items based on their text baseline.

center → const BoxAlignmentBase

Centers content within the container.

end → const BoxAlignmentBase

Aligns to the end of the container, respecting text direction. In LTR text, this is right/bottom; in RTL text, this is left/bottom.

start → const BoxAlignmentBase

Aligns to the start of the container, respecting text direction. In LTR text, this is left/top; in RTL text, this is right/top.