From 3f45ad55e1877611357e01facf777d291f187bcb Mon Sep 17 00:00:00 2001
From: Hyobeen-Park <amanda0109@naver.com>
Date: Wed, 10 Jul 2024 04:27:18 +0900
Subject: [PATCH] =?UTF-8?q?[FEAT/#28]=20customShadow=20=EA=B5=AC=ED=98=84?=
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---
 .../component/modifier/ShadowModifier.kt      | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 core/src/main/java/com/terning/core/designsystem/component/modifier/ShadowModifier.kt

diff --git a/core/src/main/java/com/terning/core/designsystem/component/modifier/ShadowModifier.kt b/core/src/main/java/com/terning/core/designsystem/component/modifier/ShadowModifier.kt
new file mode 100644
index 000000000..ad17c3c77
--- /dev/null
+++ b/core/src/main/java/com/terning/core/designsystem/component/modifier/ShadowModifier.kt
@@ -0,0 +1,68 @@
+package com.terning.core.designsystem.component.modifier
+
+import android.graphics.BlurMaskFilter
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+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.platform.LocalDensity
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import com.terning.core.designsystem.theme.Grey200
+
+@Composable
+fun Modifier.customShadow(
+    color: Color = Grey200,
+    shadowRadius: Dp = 0.dp,
+    shadowWidth: Dp = 2.dp,
+    offsetX: Dp = 0.dp,
+    offsetY: Dp = 0.dp,
+) = composed {
+    val paint: Paint = remember { Paint() }
+    val density = LocalDensity.current
+    val radius = shadowRadius + shadowWidth
+    val blurRadiusPx = with(density) { radius.toPx() }
+    val maskFilter = remember {
+        BlurMaskFilter(blurRadiusPx, BlurMaskFilter.Blur.NORMAL)
+    }
+    drawBehind {
+        drawIntoCanvas { canvas ->
+            val frameworkPaint = paint.asFrameworkPaint()
+            if (radius != 0.dp) {
+                frameworkPaint.maskFilter = maskFilter
+            }
+            frameworkPaint.color = color.toArgb()
+
+            val leftPixel = offsetX.toPx()
+            val topPixel = offsetY.toPx()
+            val rightPixel = size.width + leftPixel
+            val bottomPixel = size.height + topPixel
+
+            if (radius > 0.dp) {
+                val radiusPx = radius.toPx()
+                canvas.drawRoundRect(
+                    left = leftPixel,
+                    top = topPixel,
+                    right = rightPixel,
+                    bottom = bottomPixel,
+                    radiusX = radiusPx,
+                    radiusY = radiusPx,
+                    paint = paint,
+                )
+            } else {
+                canvas.drawRect(
+                    left = leftPixel,
+                    top = topPixel,
+                    right = rightPixel,
+                    bottom = bottomPixel,
+                    paint = paint,
+                )
+            }
+        }
+    }
+}