Crate cranpose_ui_layout 

Cranpose UI Layout

cranpose-ui-layout defines measurement, placement, alignment and arrangement contracts for Cranpose widgets. Custom layout authors use Constraints, Measurable, MeasureScope and Placeable. App developers usually use Column, Row, Box and Layout from cranpose.

Adjust child constraints

Constraints use logical pixels. A custom measure policy can deflate parent bounds before a child measure call:

use cranpose_ui_layout::Constraints;

let parent = Constraints::loose(320.0, 480.0);
let child = parent.deflate(16.0, 12.0);
let (width, height) = child.constrain(400.0, 40.0);
assert_eq!((width, height), (304.0, 40.0));

The feature set is empty. See the Constraints API, the layout guide and the crate source.

Modules

prelude

Structs

Alignment

Alignment across both axes used for positioning content within a box.

AlignmentLines

Text baselines measured down from a layout’s top edge.

AxisHold

The incoming constraints of one axis a measurement holds for.

BoundRange

The values one bound of incoming constraints may take, both ends included.

Constraints

Constraints used during layout measurement.

ConstraintsHold

The incoming constraints a measurement stays the same under. A node whose inputs did not change answers any constraints inside with the measurement it has, instead of measuring again: an animated width otherwise measured again every fixed-size box and every text it does not wrap.

FlexParentData

Parent data for flex layouts (Row/Column weights and alignment).

LayoutModifierMeasureResult

Result of a layout modifier measurement operation.

MeasureResult

Result of a measurement operation.

Measurement

The size and explicit alignment lines produced by a measure policy.

ParentData

Layout metadata supplied by a child for its direct parent.

Placeable

Result of running a measurement pass for a single child.

Placement

Placement information for a measured child.

WrappedHold

What the content a layout modifier wraps measured: its size and the constraints that measure holds for, None when only the constraints it had.

Enums

Axis

Represents the primary axis of flex layout (Row or Column).

HorizontalAlignment

Alignment along the horizontal axis.

IntrinsicSize

Specifies how to size a component based on its intrinsic measurements.

LinearArrangement

Arrangement strategy matching Jetpack Compose’s linear arrangements.

VerticalAlignment

Alignment along the vertical axis.

Traits

Arrangement

Trait implemented by arrangement strategies that distribute children on an axis.

AxisAlignment

An alignment along one axis, which places a block at a bias of the space left beside it.

Measurable

Object capable of measuring a layout child and exposing intrinsic sizes.

MeasurePolicy

Policy responsible for measuring and placing children.

MeasureScope

Scope for measurement operations.

PlaceTarget

What a node-backed Placeable tells when its parent places it.

Functions

bias_offset

Compose’s BiasAlignment: the offset that puts child at bias of available (-1 the start, 0 the middle, 1 the end), on a whole device pixel of density as Kotlin’s roundToInt rounds it, and before the start when the child is the larger.

ceil_to_px

A length moved up onto the next whole device pixel, as Compose sizes text: a layout’s size is its paragraph’s, ceiled, so it never clips.

round_to_px

A length moved onto the whole device pixel Compose would give it.