MeasureScope

Added in 1.0.0

Cmn

@MeasureScopeMarker
interface MeasureScope : IntrinsicMeasureScope

Known direct subclasses

ApproachMeasureScope, LazyLayoutMeasureScope, SubcomposeMeasureScope

`ApproachMeasureScope`	`ApproachMeasureScope` provides access to lookahead results to allow `ApproachLayoutModifierNode` to leverage lookahead results to define how measurements and placements approach their destination.
`LazyLayoutMeasureScope`	The receiver scope of a `LazyLayout`'s measure lambda.
`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`.

The receiver scope of a layout's measure lambda. The return value of the measure lambda is MeasureResult, which should be returned by layout

Summary

Public functions
`open MeasureResult`	`layout( width: Int, height: Int, alignmentLines: Map<AlignmentLine, Int>, 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.	Cmn
`open MeasureResult`	`layout( width: Int, height: Int, alignmentLines: Map<AlignmentLine, Int>, rulers: (RulerScope.() -> Unit)?, 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.	Cmn

Inherited functions

From androidx.compose.ui.unit.Density

`open Int`	`Dp.roundToPx()` Convert `Dp` to `Int` by rounding	Cmn
`open Int`	`TextUnit.roundToPx()` Convert Sp to `Int` by rounding	Cmn
`open Dp`	`Int.toDp()` Convert an `Int` pixel value to `Dp`.	Cmn
`open Dp`	`Float.toDp()` Convert a `Float` pixel value to a Dp	Cmn
`open DpSize`	`Size.toDpSize()` Convert a `Size` to a `DpSize`.	Cmn
`open Float`	`Dp.toPx()` Convert `Dp` to pixels.	Cmn
`open Float`	`TextUnit.toPx()` Convert Sp to pixels.	Cmn
`open Rect`	`DpRect.toRect()` Convert a `DpRect` to a `Rect`.	Cmn
`open Size`	`DpSize.toSize()` Convert a `DpSize` to a `Size`.	Cmn
`open TextUnit`	`Int.toSp()` Convert an `Int` pixel value to Sp.	Cmn
`open TextUnit`	`Float.toSp()` Convert a `Float` pixel value to a Sp	Cmn

From androidx.compose.ui.unit.FontScaling

`open Dp`	`TextUnit.toDp()` Convert Sp to `Dp`.	Cmn
`open TextUnit`	`Dp.toSp()` Convert `Dp` to Sp.	Cmn

Inherited properties

From androidx.compose.ui.unit.Density

Float

density

The logical density of the display.

Cmn

From androidx.compose.ui.unit.FontScaling

Float

fontScale

Current user preference for the scaling factor for fonts.

Cmn

From androidx.compose.ui.layout.IntrinsicMeasureScope

`open Boolean`	`isLookingAhead` This indicates whether the ongoing measurement is for lookahead pass.	Cmn
`LayoutDirection`	`layoutDirection` The `LayoutDirection` of the `Layout` or `LayoutModifier` using the measure scope to measure their children.	Cmn

Public functions

layout

Cmn

Added in 1.0.0

open fun layout(
    width: Int,
    height: Int,
    alignmentLines: Map<AlignmentLine, Int> = emptyMap(),
    placementBlock: Placeable.PlacementScope.() -> Unit
): MeasureResult

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.

Parameters
`width: Int`	the measured width of the layout
`height: Int`	the measured height of the layout
`alignmentLines: Map<AlignmentLine, Int> = emptyMap()`	the alignment lines defined by the layout
`placementBlock: Placeable.PlacementScope.() -> Unit`	block defining the children positioning of the current layout

layout

Cmn

Added in 1.7.0

open fun layout(
    width: Int,
    height: Int,
    alignmentLines: Map<AlignmentLine, Int> = emptyMap(),
    rulers: (RulerScope.() -> Unit)? = null,
    placementBlock: Placeable.PlacementScope.() -> Unit
): MeasureResult

Parameters
`width: Int`	the measured width of the layout
`height: Int`	the measured height of the layout
`alignmentLines: Map<AlignmentLine, Int> = emptyMap()`	the alignment lines defined by the layout
`rulers: (RulerScope.() -> Unit)? = null`	a method to set Ruler values used by all placed children
`placementBlock: Placeable.PlacementScope.() -> Unit`	block defining the children positioning of the current layout