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Draw a colored shadow in Android Jetpack Compose
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/* | |
Copyright 2020 Cedric Kring. | |
Licensed under the Apache License, Version 2.0 (the "License"); | |
you may not use this file except in compliance with the License. | |
You may obtain a copy of the License at | |
http://www.apache.org/licenses/LICENSE-2.0 | |
Unless required by applicable law or agreed to in writing, software | |
distributed under the License is distributed on an "AS IS" BASIS, | |
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
See the License for the specific language governing permissions and | |
limitations under the License. | |
*/ | |
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 | |
) | |
} | |
} |
color.copy(alpha = 0.0f).toArgb()
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you can use this version
https://gist.github.com/tasjapr/ed66e6ba1d70cc1c6ff65ae38500a7b4