Add scrollbar indicator to LazyColumn (#7164)

app/src/main/java/eu/kanade/presentation/components/LazyList.kt

@@ -0,0 +1,58 @@
+package eu.kanade.presentation.components
+
+import androidx.compose.foundation.gestures.FlingBehavior
+import androidx.compose.foundation.gestures.ScrollableDefaults
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.calculateEndPadding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListScope
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.platform.LocalLayoutDirection
+import androidx.compose.ui.unit.dp
+import eu.kanade.presentation.util.drawVerticalScrollbar
+
+/**
+ * LazyColumn with scrollbar.
+ */
+@Composable
+fun ScrollbarLazyColumn(
+    modifier: Modifier = Modifier,
+    state: LazyListState = rememberLazyListState(),
+    contentPadding: PaddingValues = PaddingValues(0.dp),
+    reverseLayout: Boolean = false,
+    verticalArrangement: Arrangement.Vertical =
+        if (!reverseLayout) Arrangement.Top else Arrangement.Bottom,
+    horizontalAlignment: Alignment.Horizontal = Alignment.Start,
+    flingBehavior: FlingBehavior = ScrollableDefaults.flingBehavior(),
+    userScrollEnabled: Boolean = true,
+    content: LazyListScope.() -> Unit,
+) {
+    val direction = LocalLayoutDirection.current
+    val density = LocalDensity.current
+    val positionOffset = remember(contentPadding) {
+        with(density) { contentPadding.calculateEndPadding(direction).toPx() }
+    }
+    LazyColumn(
+        modifier = modifier
+            .drawVerticalScrollbar(
+                state = state,
+                reverseScrolling = reverseLayout,
+                positionOffsetPx = positionOffset,
+            ),
+        state = state,
+        contentPadding = contentPadding,
+        reverseLayout = reverseLayout,
+        verticalArrangement = verticalArrangement,
+        horizontalAlignment = horizontalAlignment,
+        flingBehavior = flingBehavior,
+        userScrollEnabled = userScrollEnabled,
+        content = content,
+    )
+}