SubcomposeMeasureScope

Kotlin |Java

abstract class SubcomposeMeasureScope<T> : MeasureScope

kotlin.Any
↳	androidx.compose.ui.layout.IntrinsicMeasureScope
	↳	androidx.compose.ui.MeasureScope
		↳	androidx.compose.ui.layout.SubcomposeMeasureScope

The receiver scope of a SubcomposeLayout's measure lambda which adds ability to dynamically subcompose a content during the measuring on top of the features provided by MeasureScope.

Summary

Public constructors
<init>() The receiver scope of a SubcomposeLayout's measure lambda which adds ability to dynamically subcompose a content during the measuring on top of the features provided by MeasureScope.

Public methods
abstract List<Measurable>	subcompose(slotId: T, content: () -> Unit) Performs subcomposition of the provided content with given slotId.

Inherited functions
From class MeasureScope MeasureScope.MeasureResult layout(width: Int, height: Int, alignmentLines: Map<AlignmentLine, Int> = emptyMap(), placementBlock: Placeable.PlacementScope.() -> Unit) Sets the size and alignment lines of the measured layout, as well as the positioning block that defines the children positioning logic. The placementBlock is a lambda used for positioning children. Placeable.placeAt should be called on children inside placementBlock. The alignmentLines can be used by the parent layouts to decide layout, and can be queried using the Placeable.get operator. Note that alignment lines will be inherited by parent layouts, such that indirect parents will be able to query them as well.
From class Density Dp toDp() Convert Sp to Dp. Dp toDp() Convert an Int pixel value to Dp. Dp toDp() Convert a Float pixel value to a Dp Int toIntPx() Convert Dp to Int by rounding Int toIntPx() Convert Sp to Int by rounding Float toPx() Convert Dp to pixels. Pixels are used to paint to Canvas. Float toPx() Convert Sp to pixels. Pixels are used to paint to Canvas. Rect toRect() Convert a Bounds to a Rect. TextUnit toSp() Convert Dp to Sp. Sp is used for font size, etc. TextUnit toSp() Convert an Int pixel value to Sp. TextUnit toSp() Convert a Float pixel value to a Sp

Inherited extension functions
From androidx.compose.foundation.layout Constraints Density.Constraints(dpConstraints: DpConstraints) Creates the Constraints corresponding to the current DpConstraints. DpConstraints Density.DpConstraints(constraints: Constraints) Creates the DpConstraints corresponding to the current Constraints.

Inherited properties
From class Density Float density The logical density of the display. This is a scaling factor for the Dp unit. Float fontScale Current user preference for the scaling factor for fonts.
From class IntrinsicMeasureScope LayoutDirection layoutDirection The LayoutDirection of the Layout or LayoutModifier using the measure scope to measure their children.

Public constructors

<init>

SubcomposeMeasureScope()

The receiver scope of a SubcomposeLayout's measure lambda which adds ability to dynamically subcompose a content during the measuring on top of the features provided by MeasureScope.

Public methods

subcompose

abstract fun subcompose(
    slotId: T, 
    content: () -> Unit
): List<Measurable>

Performs subcomposition of the provided content with given slotId.

Parameters
slotId: T	unique id which represents the slot we are composing into. If you have fixed amount or slots you can use enums as slot ids, or if you have a list of items maybe an index in the list or some other unique key can work. To be able to correctly match the content between remeasures you should provide the object which is equals to the one you used during the previous measuring.
content: () -> Unit	the composable content which defines the slot. It could emit multiple layouts, in this case the returned list of Measurables will have multiple elements.