graphicsLayer

Functions summary

Modifier

A Modifier.Node that makes content draw into a draw layer.
Cmn
Modifier
Modifier.graphicsLayer(
    scaleX: Float,
    scaleY: Float,
    alpha: Float,
    translationX: Float,
    translationY: Float,
    shadowElevation: Float,
    rotationX: Float,
    rotationY: Float,
    rotationZ: Float,
    cameraDistance: Float,
    transformOrigin: TransformOrigin,
    shape: Shape,
    clip: Boolean,
    renderEffect: RenderEffect?,
    ambientShadowColor: Color,
    spotShadowColor: Color,
    compositingStrategy: CompositingStrategy,
    blendMode: BlendMode,
    colorFilter: ColorFilter?
)

A Modifier.Element that makes content draw into a draw layer.
Cmn

Functions

Modifier.graphicsLayer

Cmn 
fun Modifier.graphicsLayer(block: GraphicsLayerScope.() -> Unit): Modifier

A Modifier.Node that makes content draw into a draw layer. The draw layer can be invalidated separately from parents. A graphicsLayer should be used when the content updates independently from anything above it to minimize the invalidated content.

graphicsLayer can be used to apply effects to content, such as scaling, rotation, opacity, shadow, and clipping. Prefer this version when you have layer properties backed by a androidx.compose.runtime.State or an animated value as reading a state inside block will only cause the layer properties update without triggering recomposition and relayout.

NOTE: block can be invoked multiple times, which is why it's important for performance to minimize work done inside of it. block may also be invoked before effects.

import androidx.compose.animation.core.Animatable
import androidx.compose.material.Text
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.graphicsLayer

val animatedAlpha = remember { Animatable(0f) }
Text(
    "Hello World",
    Modifier.graphicsLayer {
        alpha = animatedAlpha.value
        clip = true
    },
)
LaunchedEffect(animatedAlpha) { animatedAlpha.animateTo(1f) }
Parameters
block: GraphicsLayerScope.() -> Unit

block on GraphicsLayerScope where you define the layer properties.

Modifier.graphicsLayer

Cmn 
fun Modifier.graphicsLayer(
    scaleX: Float = 1.0f,
    scaleY: Float = 1.0f,
    alpha: Float = 1.0f,
    translationX: Float = 0.0f,
    translationY: Float = 0.0f,
    shadowElevation: Float = 0.0f,
    rotationX: Float = 0.0f,
    rotationY: Float = 0.0f,
    rotationZ: Float = 0.0f,
    cameraDistance: Float = DefaultCameraDistance,
    transformOrigin: TransformOrigin = TransformOrigin.Center,
    shape: Shape = RectangleShape,
    clip: Boolean = false,
    renderEffect: RenderEffect? = null,
    ambientShadowColor: Color = DefaultShadowColor,
    spotShadowColor: Color = DefaultShadowColor,
    compositingStrategy: CompositingStrategy = CompositingStrategy.Auto,
    blendMode: BlendMode = BlendMode.SrcOver,
    colorFilter: ColorFilter? = null
): Modifier

A Modifier.Element that makes content draw into a draw layer. The draw layer can be invalidated separately from parents. A graphicsLayer should be used when the content updates independently from anything above it to minimize the invalidated content.

graphicsLayer can also be used to apply effects to content, such as scaling (scaleX, scaleY), rotation (rotationX, rotationY, rotationZ), opacity (alpha), shadow (shadowElevation, shape), clipping (clip, shape), as well as altering the result of the layer with RenderEffect. Shadow color and ambient colors can be modified by configuring the spotShadowColor and ambientShadowColor respectively.

CompositingStrategy determines whether or not the contents of this layer are rendered into an offscreen buffer. This is useful in order to optimize alpha usages with CompositingStrategy.ModulateAlpha which will skip the overhead of an offscreen buffer but can generate different rendering results depending on whether or not the contents of the layer are overlapping. Similarly leveraging CompositingStrategy.Offscreen is useful in situations where creating an offscreen buffer is preferred usually in conjunction with BlendMode usage.

Note that if you provide a non-zero shadowElevation and if the passed shape is concave the shadow will not be drawn on Android versions less than 10.

Also note that alpha values less than 1.0f will have their contents implicitly clipped to their bounds unless CompositingStrategy.ModulateAlpha is specified. This is because an intermediate compositing layer is created to render contents into first before being drawn into the destination with the desired alpha. This layer is sized to the bounds of the composable this modifier is configured on, and contents outside of these bounds are omitted.

If the layer parameters are backed by a androidx.compose.runtime.State or an animated value prefer an overload with a lambda block on GraphicsLayerScope as reading a state inside the block will only cause the layer properties update without triggering recomposition and relayout.

import androidx.compose.material.Text
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.graphicsLayer

Text("Hello World", Modifier.graphicsLayer(alpha = 0.5f, clip = true))
 
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.size
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.CompositingStrategy
import androidx.compose.ui.graphics.drawscope.inset
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.unit.dp

Canvas(
    modifier =
        Modifier.size(100.dp)
            .background(Color.Black)
            .graphicsLayer(
                alpha = 0.5f,
                compositingStrategy = CompositingStrategy.ModulateAlpha,
            )
) {
    // Configuring an alpha less than 1.0 and specifying
    // CompositingStrategy.ModulateAlpha ends up with the overlapping region
    // of the 2 draw rect calls to blend transparent blue and transparent red
    // against the black background instead of just transparent blue which is what would
    // occur with CompositingStrategy.Auto or CompositingStrategy.Offscreen
    inset(0f, 0f, size.width / 3, size.height / 3) { drawRect(color = Color.Red) }
    inset(size.width / 3, size.height / 3, 0f, 0f) { drawRect(color = Color.Blue) }
}
Parameters
scaleX: Float = 1.0f

see GraphicsLayerScope.scaleX
scaleY: Float = 1.0f

see GraphicsLayerScope.scaleY
alpha: Float = 1.0f

see GraphicsLayerScope.alpha
translationX: Float = 0.0f

see GraphicsLayerScope.translationX
translationY: Float = 0.0f

see GraphicsLayerScope.translationY
shadowElevation: Float = 0.0f

see GraphicsLayerScope.shadowElevation
rotationX: Float = 0.0f

see GraphicsLayerScope.rotationX
rotationY: Float = 0.0f

see GraphicsLayerScope.rotationY
rotationZ: Float = 0.0f

see GraphicsLayerScope.rotationZ
cameraDistance: Float = DefaultCameraDistance

see GraphicsLayerScope.cameraDistance
transformOrigin: TransformOrigin = TransformOrigin.Center

see GraphicsLayerScope.transformOrigin
shape: Shape = RectangleShape

see GraphicsLayerScope.shape
clip: Boolean = false

see GraphicsLayerScope.clip
renderEffect: RenderEffect? = null

see GraphicsLayerScope.renderEffect
ambientShadowColor: Color = DefaultShadowColor

see GraphicsLayerScope.ambientShadowColor
spotShadowColor: Color = DefaultShadowColor

see GraphicsLayerScope.spotShadowColor
compositingStrategy: CompositingStrategy = CompositingStrategy.Auto

see GraphicsLayerScope.compositingStrategy
blendMode: BlendMode = BlendMode.SrcOver

see GraphicsLayerScope.blendMode
colorFilter: ColorFilter? = null

see GraphicsLayerScope.colorFilter