LazyLayoutMeasureScope

Artifact: androidx.compose.foundation:foundation

Added in 1.2.0

Cmn

sealed interface LazyLayoutMeasureScope : MeasureScope

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

Call compose to compose items emitted in a content block for a given index.

Summary

Public functions
`List<Measurable>`	`compose(index: @IntRange(from = 0) Int)` Compose an item of lazy layout.	Cmn
`List<Placeable>`	`@ExperimentalFoundationApi measure(index: Int, constraints: Constraints)` This function is deprecated. Please use compose and call Measurable.measure	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

From androidx.compose.ui.layout.MeasureScope

`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 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

compose

Cmn

Added in 1.9.0-alpha03

fun compose(index: @IntRange(from = 0) Int): List<Measurable>

Compose an item of lazy layout.

Parameters
`index: @IntRange(from = 0) Int`	the item index. Should be no larger that `LazyLayoutItemProvider.itemCount`.

Returns
`List<Measurable>`	List of `Measurable`s. Note that if you emitted multiple children into the item composable you will receive multiple measurebles.

measure

Cmn

@ExperimentalFoundationApi
fun measure(index: Int, constraints: Constraints): List<Placeable>

Subcompose and measure the item of lazy layout.

Parameters
`index: Int`	the item index. Should be no larger that `LazyLayoutItemProvider.itemCount`.
`constraints: Constraints`	`Constraints` to measure the children emitted into an item content composable specified via `LazyLayoutItemProvider.Item`.

Returns
`List<Placeable>`	List of `Placeable`s. Note that if you emitted multiple children into the item composable you will receive multiple placeables, each of them will be measured with the passed `constraints`.