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androidx.compose.ui

Interfaces

Alignment

An interface to calculate the position of a sized box inside an available space.
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Alignment.Horizontal

An interface to calculate the position of box of a certain width inside an available width.
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Alignment.Vertical

An interface to calculate the position of a box of a certain height inside an available height.
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Modifier

An ordered, immutable collection of modifier elements that decorate or add behavior to Compose UI elements.
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Modifier.Element

A single element contained within a Modifier chain.
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MotionDurationScale

Provides a duration scale for motion such as animations.
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Classes

BiasAbsoluteAlignment

An Alignment specified by bias: for example, a bias of -1 represents alignment to the left/top, a bias of 0 will represent centering, and a bias of 1 will represent right/bottom.
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BiasAbsoluteAlignment.Horizontal

An Alignment.Horizontal specified by bias: for example, a bias of -1 represents alignment to the left, a bias of 0 will represent centering, and a bias of 1 will represent right.
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BiasAlignment

An Alignment specified by bias: for example, a bias of -1 represents alignment to the start/top, a bias of 0 will represent centering, and a bias of 1 will represent end/bottom.
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BiasAlignment.Horizontal

An Alignment.Horizontal specified by bias: for example, a bias of -1 represents alignment to the start, a bias of 0 will represent centering, and a bias of 1 will represent end.
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BiasAlignment.Vertical

An Alignment.Vertical specified by bias: for example, a bias of -1 represents alignment to the top, a bias of 0 will represent centering, and a bias of 1 will represent bottom.
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CombinedModifier

A node in a Modifier chain.
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FrameRateCategory

A type-safe representation of a frame rate category for a display or application.
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Modifier.Node

The longer-lived object that is created for each Modifier.Element applied to a androidx.compose.ui.layout.Layout.
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Objects

AbsoluteAlignment

A collection of common Alignments unaware of the layout direction.
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ComposeUiFlags

This is a collection of flags which are used to guard against regressions in some of the "riskier" refactors or new feature support that is added to this module.
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Modifier.Companion

The companion object Modifier is the empty, default, or starter Modifier that contains no elements.
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MotionDurationScale.Key
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Annotations

ExperimentalComposeUiApi
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ExperimentalIndirectPointerApi
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InternalComposeUiApi

Unstable API for use only between compose-ui modules sharing the same exact version, subject to change without notice in major, minor, or patch releases.
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UiComposable

An annotation that can be used to mark a composable function as being expected to be use in a composable function that is also marked or inferred to be marked as a UiComposable.
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Extension functions summary

Modifier
Modifier.composed(
    inspectorInfo: InspectorInfo.() -> Unit,
    factory: @Composable Modifier.() -> Modifier
)

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Cmn
Modifier
Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    inspectorInfo: InspectorInfo.() -> Unit,
    factory: @Composable Modifier.() -> Modifier
)

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Cmn
Modifier
Modifier.composed(
    fullyQualifiedName: String,
    vararg keys: Any?,
    inspectorInfo: InspectorInfo.() -> Unit,
    factory: @Composable Modifier.() -> Modifier
)

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Cmn
Modifier
Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    key2: Any?,
    inspectorInfo: InspectorInfo.() -> Unit,
    factory: @Composable Modifier.() -> Modifier
)

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Cmn
Modifier
Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    key2: Any?,
    key3: Any?,
    inspectorInfo: InspectorInfo.() -> Unit,
    factory: @Composable Modifier.() -> Modifier
)

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies.
Cmn
Modifier

A modifier that keeps the device screen on as long as it is part of the composition on supported platforms.
Cmn
Modifier

Materialize any instance-specific composed modifiers for applying to a raw tree node.
Cmn
Modifier

Set a requested frame rate on Composable
Cmn
Modifier
Modifier.preferredFrameRate(
    frameRate: @FloatRange(from = 0.0, to = 360.0) Float
)

Set a requested frame rate on Composable
Cmn
Modifier
Modifier.sensitiveContent(isContentSensitive: Boolean)

This modifier hints that the composable renders sensitive content (i.e. username, password, credit card etc) on the screen, and the content should be protected during screen share in supported environments.
Cmn
Modifier

Creates a modifier that controls the drawing order for the children of the same layout parent.
Cmn

Extension functions

composed

Cmn 
fun Modifier.composed(
    inspectorInfo: InspectorInfo.() -> Unit = NoInspectorInfo,
    factory: @Composable Modifier.() -> Modifier
): Modifier

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies. composed may be used to implement stateful modifiers that have instance-specific state for each modified element, allowing the same Modifier instance to be safely reused for multiple elements while maintaining element-specific state.

If inspectorInfo is specified this modifier will be visible to tools during development. Specify the name and arguments of the original modifier.

Example usage:

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo

// let's create your own custom stateful modifier
fun Modifier.myColorModifier(color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myColorModifier"
                // specify a single argument as the value when the argument name is irrelevant
                value = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )
 
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo
import androidx.compose.ui.unit.Dp

// let's create your own custom stateful modifier with multiple arguments
fun Modifier.myModifier(width: Dp, height: Dp, color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myModifier"
                // add name and value of each argument
                properties["width"] = width
                properties["height"] = height
                properties["color"] = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )

materialize must be called to create instance-specific modifiers if you are directly applying a Modifier to an element tree node.

composed

Cmn 
fun Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    inspectorInfo: InspectorInfo.() -> Unit = NoInspectorInfo,
    factory: @Composable Modifier.() -> Modifier
): Modifier

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies. composed may be used to implement stateful modifiers that have instance-specific state for each modified element, allowing the same Modifier instance to be safely reused for multiple elements while maintaining element-specific state.

When keys are provided, composed produces a Modifier that will compare equals to another modifier constructed with the same keys in order to take advantage of caching and skipping optimizations. fullyQualifiedName should be the fully-qualified import name for your modifier factory function, e.g. com.example.myapp.ui.fancyPadding.

If inspectorInfo is specified this modifier will be visible to tools during development. Specify the name and arguments of the original modifier.

Example usage:

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo

// let's create your own custom stateful modifier
fun Modifier.myColorModifier(color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myColorModifier"
                // specify a single argument as the value when the argument name is irrelevant
                value = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )
 
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo
import androidx.compose.ui.unit.Dp

// let's create your own custom stateful modifier with multiple arguments
fun Modifier.myModifier(width: Dp, height: Dp, color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myModifier"
                // add name and value of each argument
                properties["width"] = width
                properties["height"] = height
                properties["color"] = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )

materialize must be called to create instance-specific modifiers if you are directly applying a Modifier to an element tree node.

composed

Cmn 
fun Modifier.composed(
    fullyQualifiedName: String,
    vararg keys: Any?,
    inspectorInfo: InspectorInfo.() -> Unit = NoInspectorInfo,
    factory: @Composable Modifier.() -> Modifier
): Modifier

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies. composed may be used to implement stateful modifiers that have instance-specific state for each modified element, allowing the same Modifier instance to be safely reused for multiple elements while maintaining element-specific state.

When keys are provided, composed produces a Modifier that will compare equals to another modifier constructed with the same keys in order to take advantage of caching and skipping optimizations. fullyQualifiedName should be the fully-qualified import name for your modifier factory function, e.g. com.example.myapp.ui.fancyPadding.

If inspectorInfo is specified this modifier will be visible to tools during development. Specify the name and arguments of the original modifier.

Example usage:

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo

// let's create your own custom stateful modifier
fun Modifier.myColorModifier(color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myColorModifier"
                // specify a single argument as the value when the argument name is irrelevant
                value = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )
 
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo
import androidx.compose.ui.unit.Dp

// let's create your own custom stateful modifier with multiple arguments
fun Modifier.myModifier(width: Dp, height: Dp, color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myModifier"
                // add name and value of each argument
                properties["width"] = width
                properties["height"] = height
                properties["color"] = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )

materialize must be called to create instance-specific modifiers if you are directly applying a Modifier to an element tree node.

composed

Cmn 
fun Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    key2: Any?,
    inspectorInfo: InspectorInfo.() -> Unit = NoInspectorInfo,
    factory: @Composable Modifier.() -> Modifier
): Modifier

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies. composed may be used to implement stateful modifiers that have instance-specific state for each modified element, allowing the same Modifier instance to be safely reused for multiple elements while maintaining element-specific state.

When keys are provided, composed produces a Modifier that will compare equals to another modifier constructed with the same keys in order to take advantage of caching and skipping optimizations. fullyQualifiedName should be the fully-qualified import name for your modifier factory function, e.g. com.example.myapp.ui.fancyPadding.

If inspectorInfo is specified this modifier will be visible to tools during development. Specify the name and arguments of the original modifier.

Example usage:

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo

// let's create your own custom stateful modifier
fun Modifier.myColorModifier(color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myColorModifier"
                // specify a single argument as the value when the argument name is irrelevant
                value = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )
 
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo
import androidx.compose.ui.unit.Dp

// let's create your own custom stateful modifier with multiple arguments
fun Modifier.myModifier(width: Dp, height: Dp, color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myModifier"
                // add name and value of each argument
                properties["width"] = width
                properties["height"] = height
                properties["color"] = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )

materialize must be called to create instance-specific modifiers if you are directly applying a Modifier to an element tree node.

composed

Cmn 
fun Modifier.composed(
    fullyQualifiedName: String,
    key1: Any?,
    key2: Any?,
    key3: Any?,
    inspectorInfo: InspectorInfo.() -> Unit = NoInspectorInfo,
    factory: @Composable Modifier.() -> Modifier
): Modifier

Declare a just-in-time composition of a Modifier that will be composed for each element it modifies. composed may be used to implement stateful modifiers that have instance-specific state for each modified element, allowing the same Modifier instance to be safely reused for multiple elements while maintaining element-specific state.

When keys are provided, composed produces a Modifier that will compare equals to another modifier constructed with the same keys in order to take advantage of caching and skipping optimizations. fullyQualifiedName should be the fully-qualified import name for your modifier factory function, e.g. com.example.myapp.ui.fancyPadding.

If inspectorInfo is specified this modifier will be visible to tools during development. Specify the name and arguments of the original modifier.

Example usage:

import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo

// let's create your own custom stateful modifier
fun Modifier.myColorModifier(color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myColorModifier"
                // specify a single argument as the value when the argument name is irrelevant
                value = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )
 
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.debugInspectorInfo
import androidx.compose.ui.unit.Dp

// let's create your own custom stateful modifier with multiple arguments
fun Modifier.myModifier(width: Dp, height: Dp, color: Color) =
    composed(
        // pass inspector information for debug
        inspectorInfo =
            debugInspectorInfo {
                // name should match the name of the modifier
                name = "myModifier"
                // add name and value of each argument
                properties["width"] = width
                properties["height"] = height
                properties["color"] = color
            },
        // pass your modifier implementation that resolved per modified element
        factory = {
            // add your modifier implementation here
            Modifier
        },
    )

materialize must be called to create instance-specific modifiers if you are directly applying a Modifier to an element tree node.

keepScreenOn

Cmn 
fun Modifier.keepScreenOn(): Modifier

A modifier that keeps the device screen on as long as it is part of the composition on supported platforms.

This is useful for scenarios where the user might not be interacting with the screen frequently but the content needs to remain visible, such as during video playback.

materialize

Cmn 
fun Composer.materialize(modifier: Modifier): Modifier

Materialize any instance-specific composed modifiers for applying to a raw tree node. Call right before setting the returned modifier on an emitted node. You almost certainly do not need to call this function directly.

preferredFrameRate

Cmn 
fun Modifier.preferredFrameRate(frameRateCategory: FrameRateCategory): Modifier

Set a requested frame rate on Composable

You can set the preferred frame rate (frames per second) for a Composable using a frame rate category see: FrameRateCategory.

For increased frame rates, please consider using FrameRateCategory.High.

Keep in mind that the preferred frame rate affects the frame rate for the next frame, so use this method carefully. It's important to note that the preference is valid as long as the Composable is drawn.

import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.size
import androidx.compose.material.Button
import androidx.compose.material.LocalContentColor
import androidx.compose.material.Text
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.FrameRateCategory
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.preferredFrameRate
import androidx.compose.ui.unit.dp

var targetAlpha by remember { mutableFloatStateOf(1f) }
val context = LocalContext.current
val activity: Activity? = findOwner(context)
DisposableEffect(activity) {
    activity?.window?.frameRateBoostOnTouchEnabled = false
    onDispose { activity?.window?.frameRateBoostOnTouchEnabled = true }
}

val alpha by
    animateFloatAsState(targetValue = targetAlpha, animationSpec = tween(durationMillis = 5000))

Column(modifier = Modifier.size(300.dp)) {
    Button(
        onClick = { targetAlpha = if (targetAlpha == 1f) 0.2f else 1f },
        modifier =
            Modifier.testTag("frameRateTag")
                .background(LocalContentColor.current.copy(alpha = alpha)),
    ) {
        Text(
            text = "Click Me for alpha change with frame rate category High",
            color = LocalContentColor.current.copy(alpha = alpha),
            modifier = Modifier.preferredFrameRate(FrameRateCategory.High),
        )
    }
}
Parameters
frameRateCategory: FrameRateCategory

The preferred frame rate category the content should be rendered at.
See also
graphicsLayer

preferredFrameRate

Cmn 
fun Modifier.preferredFrameRate(
    frameRate: @FloatRange(from = 0.0, to = 360.0) Float
): Modifier

Set a requested frame rate on Composable

You can set the preferred frame rate (frames per second) for a Composable using a non-negative number. This API should only be used when a specific frame rate is needed for your Composable. For example, 24 or 30 for video play.

If multiple frame rates are requested, they will be aggregated to determine a feasible frame rate.

If you no longer want this modifier to influence the frame rate, clear the preference by setting it to 0.

Keep in mind that the preferred frame rate affects the frame rate for the next frame, so use this method carefully. It's important to note that the preference is valid as long as the Composable is drawn.

import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.size
import androidx.compose.material.Button
import androidx.compose.material.LocalContentColor
import androidx.compose.material.Text
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.preferredFrameRate
import androidx.compose.ui.unit.dp

var targetAlpha by remember { mutableFloatStateOf(1f) }
val context = LocalContext.current
val activity: Activity? = findOwner(context)
DisposableEffect(activity) {
    activity?.window?.frameRateBoostOnTouchEnabled = false
    onDispose { activity?.window?.frameRateBoostOnTouchEnabled = true }
}

val alpha by
    animateFloatAsState(targetValue = targetAlpha, animationSpec = tween(durationMillis = 5000))

Column(modifier = Modifier.size(300.dp)) {
    Button(
        onClick = { targetAlpha = if (targetAlpha == 1f) 0.2f else 1f },
        modifier =
            Modifier.testTag("frameRateTag")
                .background(LocalContentColor.current.copy(alpha = alpha)),
    ) {
        Text(
            text = "Click Me for alpha change with 30 Hz frame rate",
            color = LocalContentColor.current.copy(alpha = alpha), // Adjust text alpha
            modifier = Modifier.preferredFrameRate(30f),
        )
    }
}
Parameters
frameRate: @FloatRange(from = 0.0, to = 360.0) Float

The preferred frame rate the content should be rendered at. Default value is 0.
See also
graphicsLayer

sensitiveContent

Cmn 
fun Modifier.sensitiveContent(isContentSensitive: Boolean = true): Modifier

This modifier hints that the composable renders sensitive content (i.e. username, password, credit card etc) on the screen, and the content should be protected during screen share in supported environments.

Parameters
isContentSensitive: Boolean = true

whether the content is sensitive or not. Defaults to true.

zIndex

Cmn 
fun Modifier.zIndex(zIndex: Float): Modifier

Creates a modifier that controls the drawing order for the children of the same layout parent. A child with larger zIndex will be drawn on top of all the children with smaller zIndex. When children have the same zIndex the original order in which the parent placed the children is used.

Note that if there would be multiple zIndex modifiers applied for the same layout the sum of their values will be used as the final zIndex. If no zIndex were applied for the layout then the default zIndex is 0.

import androidx.compose.foundation.layout.Box
import androidx.compose.material.Text
import androidx.compose.ui.Modifier
import androidx.compose.ui.zIndex

Box {
    Text("Drawn second", Modifier.zIndex(1f))
    Text("Drawn first")
}
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