dropShadow.kt

drop Shadow compose

import android.graphics.BlurMaskFilter

import androidx.compose.ui.Modifier
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.shadow2(
    color: Color = Color(0xB3DADADA),
    offsetX: Dp = -1.dp,
    offsetY: Dp = 1.dp,
    blurRadius: Dp = 30.dp,
) = then(
    drawBehind {
        drawIntoCanvas { canvas ->
            val paint = Paint()
            val frameworkPaint = paint.asFrameworkPaint()
            if (blurRadius != 0.dp) {
                frameworkPaint.maskFilter = (BlurMaskFilter(blurRadius.toPx(), BlurMaskFilter.Blur.NORMAL))
            }
            frameworkPaint.color = color.toArgb()

            val leftPixel = offsetX.toPx()
            val topPixel = offsetY.toPx()
            val rightPixel = size.width + topPixel
            val bottomPixel = size.height + leftPixel

            canvas.drawRect(
                left = leftPixel,
                top = topPixel,
                right = rightPixel,
                bottom = bottomPixel,
                paint = paint,
            )
        }
    }
)