feat(banner): 배너 시각 정렬을 보완한다

app/src/main/java/kr/co/vividnext/sodalive/v2/widget/banner/BannerView.kt

@@ -38,6 +38,7 @@ class BannerView @JvmOverloads constructor(
     private var currentAdapterPosition: Int = 0
     private var itemSpacingPx: Int = 0
     private var spacingDecoration: RecyclerView.ItemDecoration? = null
+    private var shouldAlignCurrentPositionAfterLayout = false
     private val autoScrollHandler = Handler(Looper.getMainLooper())
     private val autoScrollRunnable = Runnable { moveToNextBanner() }
     private var hasWindowAttachmentForAutoScroll = false
@@ -116,6 +117,7 @@ class BannerView @JvmOverloads constructor(
     fun setItems(items: List<BannerItem>) {
         this.items = items
         currentIndex = 0
+        shouldAlignCurrentPositionAfterLayout = true
         visibility = if (items.isEmpty()) GONE else VISIBLE
         stopAutoScroll()
         adapter.submitItems(items)
@@ -179,6 +181,15 @@ class BannerView @JvmOverloads constructor(
             spacingDecoration?.let(::removeItemDecoration)
             spacingDecoration = BannerSpacingDecoration(itemSpacingPx).also(::addItemDecoration)
         }
+        counterContainer?.let { counter ->
+            val params = counter.layoutParams as? LayoutParams ?: return@let
+            params.marginEnd = (size.sideInsetDp + COUNTER_ITEM_MARGIN_DP).dpToPx()
+            counter.layoutParams = params
+        }
+        if (shouldAlignCurrentPositionAfterLayout) {
+            scrollToCurrentBanner()
+            shouldAlignCurrentPositionAfterLayout = false
+        }
     }
 
     private fun scrollToCurrentBanner() {
@@ -188,7 +199,15 @@ class BannerView @JvmOverloads constructor(
         } else {
             currentIndex
         }
-        recyclerView.scrollToPosition(currentAdapterPosition)
+        val layoutManager = recyclerView.layoutManager as? LinearLayoutManager
+        if (items.size > 1 && layoutManager != null) {
+            layoutManager.scrollToPositionWithOffset(
+                currentAdapterPosition,
+                -(itemSpacingPx / 2)
+            )
+        } else {
+            recyclerView.scrollToPosition(currentAdapterPosition)
+        }
     }
 
     private fun moveToNextBanner() {
@@ -263,6 +282,7 @@ class BannerView @JvmOverloads constructor(
     companion object {
         private const val AUTO_SCROLL_INTERVAL_MS = 5_000L
         private const val SCROLL_ANIMATION_DURATION_MS = 350
+        private const val COUNTER_ITEM_MARGIN_DP = 14
 
         fun scrollAnimationDurationMsForTest(): Int = SCROLL_ANIMATION_DURATION_MS
     }
@@ -280,7 +300,9 @@ class BannerView @JvmOverloads constructor(
             parent: RecyclerView,
             state: RecyclerView.State
         ) {
-            outRect.right = spacingPx
+            val leftSpacing = spacingPx / 2
+            outRect.left = leftSpacing
+            outRect.right = spacingPx - leftSpacing
         }
     }
 }