{% setvar book_path %}/reference/androidx/_book.yaml{% endsetvar %} {% include "_shared/_reference-head-tags.html" %}

AlphaKt

public final class AlphaKt


Summary

Public methods

static final @NonNull Modifier
alpha(@NonNull Modifier receiver, float alpha)

Draw content with modified alpha that may be less than 1.

Public methods

alpha

public static final @NonNull Modifier alpha(@NonNull Modifier receiver, float alpha)

Draw content with modified alpha that may be less than 1.

Usage of this API renders this composable into a separate graphics layer. Note when an alpha less than 1.0f is provided, contents are implicitly clipped to their bounds. 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.

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp

Box(Modifier.size(100.dp).alpha(alpha = 0.5f).background(Color.Red))
Parameters
float alpha

the fraction of children's alpha value and must be between 0 and 1, inclusive.

See also
graphicsLayer

Example usage: