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Draw a colored shadow in Android Jetpack Compose
import androidx.compose.ui.Modifier
import androidx.compose.ui.drawBehind
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Paint
import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
fun Modifier.drawColoredShadow(
color: Color,
alpha: Float = 0.2f,
borderRadius: Dp = 0.dp,
shadowRadius: Dp = 20.dp,
offsetY: Dp = 0.dp,
offsetX: Dp = 0.dp
) = this.drawBehind {
val transparentColor = android.graphics.Color.toArgb(color.copy(alpha = 0.0f).value.toLong())
val shadowColor = android.graphics.Color.toArgb(color.copy(alpha = alpha).value.toLong())
this.drawIntoCanvas {
val paint = Paint()
val frameworkPaint = paint.asFrameworkPaint()
frameworkPaint.color = transparentColor
frameworkPaint.setShadowLayer(
shadowRadius.toPx(),
offsetX.toPx(),
offsetY.toPx(),
shadowColor
)
it.drawRoundRect(
0f,
0f,
this.size.width,
this.size.height,
borderRadius.toPx(),
borderRadius.toPx(),
paint
)
}
}
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