Navigation 구현

app/src/main/kotlin/com/yourssu/handy/demo/NavigationPreview.kt

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+package com.yourssu.handy.demo
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.tooling.preview.Preview
+import com.yourssu.handy.compose.BottomNavItem
+import com.yourssu.handy.compose.Navigation
+import com.yourssu.handy.compose.icons.HandyIcons
+import com.yourssu.handy.compose.icons.filled.Home
+
+@Preview(showBackground = true)
+@Composable
+fun NavigationPreview() {
+    val items = listOf(
+        BottomNavItem(
+            icon = HandyIcons.Filled.Home,
+            label = null
+        ),
+        BottomNavItem(
+            icon = HandyIcons.Filled.Home,
+            label = "Label"
+        ),
+        BottomNavItem(
+            icon = HandyIcons.Filled.Home,
+            label = "Label"
+        ),
+        BottomNavItem(
+            icon = HandyIcons.Filled.Home,
+            label = "Label"
+        ),
+        BottomNavItem(
+            icon = HandyIcons.Filled.Home,
+            label = "Label"
+        ),
+    )
+
+    Navigation(
+        items = items,
+        selectedIndex = 0,
+        onItemSelected = {}
+    )
+}

compose/src/main/kotlin/com/yourssu/handy/compose/Navigation.kt

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+package com.yourssu.handy.compose
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+import com.yourssu.handy.compose.foundation.HandyTypography
+
+/**
+ * BottomNavItem : 하단 네비게이션 바의 아이템을 정의하는 데이터 클래스 입니다.
+ *
+ * @param icon 아이템의 아이콘
+ * @param label 아이템의 라벨
+ */
+data class BottomNavItem(
+    val icon: ImageVector,
+    val label: String?
+)
+
+/**
+ * BottomNavItem : 하단 네비게이션 바의 아이템 Composable 함수 입니다.
+ *
+ * @param item 하단 네비게이션 바의 아이템
+ * @param isSelected 선택되었는지 여부
+ * @param onClick 클릭 시 실행되는 함수
+ * @param modifier Modifier
+ */
+@Composable
+private fun BottomNavItem(
+    item: BottomNavItem,
+    isSelected: Boolean,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val color =
+        if (isSelected) HandyTheme.colors.textBasicPrimary else HandyTheme.colors.textBasicDisabled
+
+    Column(
+        modifier = modifier
+            .clickable(
+                interactionSource = remember { MutableInteractionSource() },
+                indication = null,
+                onClick = onClick
+            ),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
+        Icon(
+            item.icon,
+            iconSize = IconSize.M,
+        )
+
+        if (item.label != null) {
+            Text(
+                text = item.label,
+                style = HandyTypography.C1Rg11,
+                color = color
+            )
+        }
+    }
+}
+
+/**
+ * Navigation : 하단 네비게이션 바 Composable 함수 입니다.
+ *
+ * @param items 하단 네비게이션 바의 아이템 리스트
+ * @param selectedIndex 선택된 아이템의 인덱스
+ * @param onItemSelected 아이템 선택 시 실행되는 함수
+ */
+@Composable
+fun Navigation(
+    items: List<BottomNavItem>,
+    selectedIndex: Int,
+    onItemSelected: (Int) -> Unit
+) {
+    require(items.size in 3..5) { "Items size must be between 3 and 5" }
+
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(56.dp),
+    ) {
+//        Divider(thickness = Thickness.Thin) // Divider 추후 추가
+        Row(
+            modifier = Modifier.fillMaxSize(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            items.forEachIndexed { index, item ->
+                BottomNavItem(
+                    item = item,
+                    isSelected = index == selectedIndex,
+                    modifier = Modifier.weight(1f),
+                    onClick = { onItemSelected(index) }
+                )
+            }
+        }
+    }
+}