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Colored Shadow
Author: Arthur Gonzaga
Jetpack Compose ships with a shadow Modifier that makes is really trivial to add a shadow to your Composable. However, shadows in Jetpack Compose do not have the ability to customize their color. This snippet provides a solution to overcome this limitation using Modifiers and the classic Android paint object.
| import androidx.compose.ui.Modifier | |
| import androidx.compose.ui.composed | |
| import androidx.compose.ui.draw.drawBehind | |
| import androidx.compose.ui.graphics.Color | |
| import androidx.compose.ui.graphics.Paint | |
| import androidx.compose.ui.graphics.drawscope.drawIntoCanvas | |
| import androidx.compose.ui.graphics.toArgb | |
| import androidx.compose.ui.unit.Dp | |
| import androidx.compose.ui.unit.dp | |
| fun Modifier.coloredShadow( | |
| color: Color, | |
| alpha: Float = 0.2f, | |
| borderRadius: Dp = 0.dp, | |
| shadowRadius: Dp = 20.dp, | |
| offsetY: Dp = 0.dp, | |
| offsetX: Dp = 0.dp | |
| ) = composed { | |
| val shadowColor = color.copy(alpha = alpha).toArgb() | |
| val transparent = color.copy(alpha= 0f).toArgb() | |
| this.drawBehind { | |
| this.drawIntoCanvas { | |
| val paint = Paint() | |
| val frameworkPaint = paint.asFrameworkPaint() | |
| frameworkPaint.color = transparent | |
| 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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