fix(content): 전체 탭 pagination 스크롤을 안정화한다

2026-07-12 01:24:19 +09:00
parent d53167c48e
commit 5bcd0f64d2
4 changed files with 100 additions and 11 deletions
--- a/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragment.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragment.kt
@@ -411,11 +411,11 @@ class ContentMainFragment : BaseFragment<FragmentV2MainContentBinding>(
        hideAllTabEmptyError()
        updateAllTabGridItemWidth()
        if (state.selectedType.usesSeriesItems()) {
-            binding.rvContentAllItems.adapter = contentAllSeriesCardAdapter
+            setAllTabAdapterIfNeeded(contentAllSeriesCardAdapter)
            contentAllAudioCardAdapter.submitItems(emptyList())
            contentAllSeriesCardAdapter.submitItems(state.seriesItems)
        } else {
-            binding.rvContentAllItems.adapter = contentAllAudioCardAdapter
+            setAllTabAdapterIfNeeded(contentAllAudioCardAdapter)
            contentAllSeriesCardAdapter.submitItems(emptyList())
            contentAllAudioCardAdapter.submitItems(state.audioItems)
        }
@@ -439,6 +439,11 @@ class ContentMainFragment : BaseFragment<FragmentV2MainContentBinding>(
        contentAllSeriesCardAdapter.setGridItemWidthPx(widthPx)
    }

+    private fun setAllTabAdapterIfNeeded(adapter: RecyclerView.Adapter<*>) {
+        if (binding.rvContentAllItems.adapter == adapter) return
+        binding.rvContentAllItems.adapter = adapter
+    }
+
    private fun bindAllTabEmpty(state: MainContentAllTabUiState.Empty) {
        bindAllTabControls(state)
        binding.layoutContentAllSurface.visibility = View.VISIBLE
@@ -485,7 +490,6 @@ class ContentMainFragment : BaseFragment<FragmentV2MainContentBinding>(
    }

    private fun clearAllTabItems() {
-        binding.rvContentAllItems.adapter = null
        contentAllAudioCardAdapter.submitItems(emptyList())
        contentAllSeriesCardAdapter.submitItems(emptyList())
    }
--- a/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllAudioCardAdapter.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllAudioCardAdapter.kt
@@ -2,6 +2,7 @@ package kr.co.vividnext.sodalive.v2.main.content.ui

 import android.view.LayoutInflater
 import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import kr.co.vividnext.sodalive.databinding.ItemContentAudioCardBinding
 import kr.co.vividnext.sodalive.extensions.loadUrl
@@ -17,12 +18,13 @@ class ContentAllAudioCardAdapter(
    fun setGridItemWidthPx(widthPx: Int) {
        if (widthPx <= 0 || gridItemWidthPx == widthPx) return
        gridItemWidthPx = widthPx
-        notifyDataSetChanged()
+        if (items.isNotEmpty()) notifyItemRangeChanged(0, items.size)
    }

-    fun submitItems(items: List<MainContentAllAudioUiModel>) {
-        this.items = items
-        notifyDataSetChanged()
+    fun submitItems(newItems: List<MainContentAllAudioUiModel>) {
+        val diffResult = DiffUtil.calculateDiff(ContentAllAudioDiffCallback(items, newItems))
+        items = newItems
+        diffResult.dispatchUpdatesTo(this)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
@@ -41,6 +43,20 @@ class ContentAllAudioCardAdapter(

    override fun getItemCount(): Int = items.size

+    private class ContentAllAudioDiffCallback(
+        private val oldList: List<MainContentAllAudioUiModel>,
+        private val newList: List<MainContentAllAudioUiModel>
+    ) : DiffUtil.Callback() {
+        override fun getOldListSize(): Int = oldList.size
+        override fun getNewListSize(): Int = newList.size
+
+        override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean =
+            oldList[oldItemPosition].audioContentId == newList[newItemPosition].audioContentId
+
+        override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean =
+            oldList[oldItemPosition] == newList[newItemPosition]
+    }
+
    class ViewHolder(
        private val binding: ItemContentAudioCardBinding,
        private val onAudioClick: (Long) -> Unit
--- a/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllSeriesCardAdapter.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllSeriesCardAdapter.kt
@@ -2,6 +2,7 @@ package kr.co.vividnext.sodalive.v2.main.content.ui

 import android.view.LayoutInflater
 import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.RecyclerView
 import kr.co.vividnext.sodalive.databinding.ItemContentAllSeriesCardBinding
 import kr.co.vividnext.sodalive.extensions.loadUrl
@@ -17,12 +18,13 @@ class ContentAllSeriesCardAdapter(
    fun setGridItemWidthPx(widthPx: Int) {
        if (widthPx <= 0 || gridItemWidthPx == widthPx) return
        gridItemWidthPx = widthPx
-        notifyDataSetChanged()
+        if (items.isNotEmpty()) notifyItemRangeChanged(0, items.size)
    }

-    fun submitItems(items: List<MainContentAllSeriesUiModel>) {
-        this.items = items
-        notifyDataSetChanged()
+    fun submitItems(newItems: List<MainContentAllSeriesUiModel>) {
+        val diffResult = DiffUtil.calculateDiff(ContentAllSeriesDiffCallback(items, newItems))
+        items = newItems
+        diffResult.dispatchUpdatesTo(this)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
@@ -41,6 +43,20 @@ class ContentAllSeriesCardAdapter(

    override fun getItemCount(): Int = items.size

+    private class ContentAllSeriesDiffCallback(
+        private val oldList: List<MainContentAllSeriesUiModel>,
+        private val newList: List<MainContentAllSeriesUiModel>
+    ) : DiffUtil.Callback() {
+        override fun getOldListSize(): Int = oldList.size
+        override fun getNewListSize(): Int = newList.size
+
+        override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean =
+            oldList[oldItemPosition].seriesId == newList[newItemPosition].seriesId
+
+        override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean =
+            oldList[oldItemPosition] == newList[newItemPosition]
+    }
+
    class ViewHolder(
        private val binding: ItemContentAllSeriesCardBinding,
        private val onSeriesClick: (Long) -> Unit
--- a/app/src/test/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragmentSourceTest.kt
+++ b/app/src/test/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragmentSourceTest.kt
@@ -572,6 +572,59 @@ class ContentMainFragmentSourceTest {
        assertSourceContains(seriesCard, "172f / 122f")
    }

+    @Test
+    fun `content 전체 탭 pagination 렌더링은 RecyclerView adapter를 보존한다`() {
+        val source = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ContentMainFragment.kt"
+        ).readText()
+        val bindContentSource = source.substringFrom("private fun bindAllTabContent")
+        val clearItemsSource = source.substringFrom("private fun clearAllTabItems")
+        val destroyViewSource = source.substringFrom("override fun onDestroyView")
+
+        assertSourceContains(source, "private fun setAllTabAdapterIfNeeded(adapter: RecyclerView.Adapter<*>)")
+        assertSourceContains(source, "if (binding.rvContentAllItems.adapter == adapter) return")
+        assertSourceContains(bindContentSource, "setAllTabAdapterIfNeeded(contentAllSeriesCardAdapter)")
+        assertSourceContains(bindContentSource, "setAllTabAdapterIfNeeded(contentAllAudioCardAdapter)")
+        assertFalse(
+            "페이지 추가 상태 재렌더링은 같은 adapter를 직접 재대입하면 스크롤 위치가 흔들릴 수 있다.",
+            bindContentSource.contains("binding.rvContentAllItems.adapter = contentAll")
+        )
+        assertFalse(
+            "Loading/Empty/Error 렌더링의 item clear는 adapter를 분리하지 않아야 한다.",
+            clearItemsSource.contains("binding.rvContentAllItems.adapter = null")
+        )
+        assertSourceContains(destroyViewSource, "binding.rvContentAllItems.adapter = null")
+    }
+
+    @Test
+    fun `content 전체 탭 adapter는 DiffUtil로 변경분만 반영한다`() {
+        val audioAdapter = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllAudioCardAdapter.kt"
+        ).readText()
+        val seriesAdapter = projectFile(
+            "app/src/main/java/kr/co/vividnext/sodalive/v2/main/content/ui/ContentAllSeriesCardAdapter.kt"
+        ).readText()
+        val audioSubmitSource = audioAdapter.substringFrom("fun submitItems")
+        val seriesSubmitSource = seriesAdapter.substringFrom("fun submitItems")
+
+        assertSourceContains(audioAdapter, "import androidx.recyclerview.widget.DiffUtil")
+        assertSourceContains(seriesAdapter, "import androidx.recyclerview.widget.DiffUtil")
+        assertSourceContains(audioSubmitSource, "DiffUtil.calculateDiff")
+        assertSourceContains(seriesSubmitSource, "DiffUtil.calculateDiff")
+        assertSourceContains(audioSubmitSource, "diffResult.dispatchUpdatesTo(this)")
+        assertSourceContains(seriesSubmitSource, "diffResult.dispatchUpdatesTo(this)")
+        assertSourceContains(audioAdapter, "oldList[oldItemPosition].audioContentId ==")
+        assertSourceContains(seriesAdapter, "oldList[oldItemPosition].seriesId ==")
+        assertSourceContains(audioAdapter, "oldList[oldItemPosition] == newList[newItemPosition]")
+        assertSourceContains(seriesAdapter, "oldList[oldItemPosition] == newList[newItemPosition]")
+        assertFalse(audioSubmitSource.contains("notifyDataSetChanged()"))
+        assertFalse(seriesSubmitSource.contains("notifyDataSetChanged()"))
+        assertFalse(audioAdapter.contains("notifyDataSetChanged()"))
+        assertFalse(seriesAdapter.contains("notifyDataSetChanged()"))
+        assertSourceContains(audioAdapter, "notifyItemRangeChanged(0, items.size)")
+        assertSourceContains(seriesAdapter, "notifyItemRangeChanged(0, items.size)")
+    }
+
    private fun banner(
        eventItem: EventItem? = null,
        creatorId: Long? = null,