fix: could not unroll the candidates somehow

refactor: rename field `left` to `before` in CompatCandidateViewAdapter

Author: WhiredPlanck

app/src/main/java/com/osfans/trime/ime/candidates/CompactCandidateModule.kt

@@ -59,7 +59,7 @@ class CompactCandidateModule(
 
     fun refreshUnrolled() {
         runBlocking {
-            _unrolledCandidateOffset.emit(adapter.left + view.childCount)
+            _unrolledCandidateOffset.emit(adapter.before + view.childCount)
         }
         bar.unrollButtonStateMachine.push(
             UnrollButtonStateMachine.TransitionEvent.UnrolledCandidatesUpdated,
@@ -71,10 +71,10 @@ class CompactCandidateModule(
     val adapter by lazy {
         CompactCandidateViewAdapter(theme).apply {
             setOnDebouncedItemClick { _, _, position ->
-                rime.launchOnReady { it.selectCandidate(left + position) }
+                rime.launchOnReady { it.selectCandidate(before + position) }
             }
             setOnItemLongClickListener { _, view, position ->
-                showCandidateAction(left + position, items[position].text, view)
+                showCandidateAction(before + position, items[position].text, view)
                 true
             }
         }

app/src/main/java/com/osfans/trime/ime/candidates/adapter/CompactCandidateViewAdapter.kt

@@ -17,7 +17,6 @@ import splitties.dimensions.dp
 import splitties.views.dsl.core.matchParent
 import splitties.views.dsl.core.wrapContent
 import splitties.views.setPaddingDp
-import kotlin.math.max
 
 open class CompactCandidateViewAdapter(val theme: Theme) : BaseQuickAdapter<CandidateItem, CandidateViewHolder>() {
     var sticky: Int = 0
@@ -32,13 +31,8 @@ open class CompactCandidateViewAdapter(val theme: Theme) : BaseQuickAdapter<Cand
     var highlightedIdx: Int = -1
         private set
 
-    val left: Int
-        get() =
-            if (sticky > 0 && previous > 0) {
-                sticky + previous
-            } else {
-                max(sticky, previous)
-            }
+    val before: Int
+        get() = sticky + previous
 
     fun updateCandidates(
         list: List<CandidateItem>,
@@ -83,7 +77,7 @@ open class CompactCandidateViewAdapter(val theme: Theme) : BaseQuickAdapter<Cand
         }
         holder.text = text
         holder.comment = comment
-        holder.idx = left + position // unused
+        holder.idx = before + position // unused
         holder.ui.root.updateLayoutParams<FlexboxLayoutManager.LayoutParams> {
             minWidth = 0
             flexGrow = 1f

app/src/main/java/com/osfans/trime/ime/candidates/unrolled/CandidatesPagingSource.kt

@@ -10,7 +10,7 @@ import com.osfans.trime.core.CandidateItem
 import com.osfans.trime.daemon.RimeSession
 import timber.log.Timber
 
-class CandidatesPagingSource(val rime: RimeSession, val offset: Int) :
+class CandidatesPagingSource(val rime: RimeSession, val total: Int, val offset: Int) :
     PagingSource<Int, CandidateItem>() {
     override suspend fun load(params: LoadParams<Int>): LoadResult<Int, CandidateItem> {
         // use candidate index for key, null means load from beginning (including offset)
@@ -22,7 +22,12 @@ class CandidatesPagingSource(val rime: RimeSession, val offset: Int) :
                 getCandidates(startIndex, pageSize)
             }
         val prevKey = if (startIndex >= pageSize) startIndex - pageSize else null
-        val nextKey = if (candidates.size < pageSize) null else startIndex + pageSize
+        val nextKey =
+            if (total > 0) {
+                if (startIndex + pageSize + 1 >= total) null else startIndex + pageSize
+            } else {
+                if (candidates.size < pageSize) null else startIndex + pageSize
+            }
         return LoadResult.Page(candidates.toList(), prevKey, nextKey)
     }
 

app/src/main/java/com/osfans/trime/ime/candidates/unrolled/window/BaseUnrolledCandidateWindow.kt

@@ -82,6 +82,7 @@ abstract class BaseUnrolledCandidateWindow(
         Pager(PagingConfig(pageSize = 48)) {
             CandidatesPagingSource(
                 rime,
+                total = compactCandidate.adapter.run { before + itemCount },
                 offset = adapter.offset,
             )
         }
@@ -123,7 +124,8 @@ abstract class BaseUnrolledCandidateWindow(
 
     private fun updateCandidatesWithOffset(offset: Int) {
         val candidates = compactCandidate.adapter.items
-        if (candidates.isEmpty()) {
+        val sticky = compactCandidate.adapter.sticky
+        if (candidates.isEmpty() && sticky == 0) {
             windowManager.attachWindow(KeyboardWindow)
         } else {
             adapter.refreshWithOffset(offset)
@@ -137,7 +139,7 @@ abstract class BaseUnrolledCandidateWindow(
         bar.unrollButtonStateMachine.push(
             UnrollButtonStateMachine.TransitionEvent.UnrolledCandidatesDetached,
             UnrollButtonStateMachine.BooleanKey.UnrolledCandidatesEmpty to
-                (compactCandidate.adapter.run { isLastPage && itemCount == adapter.offset }),
+                (compactCandidate.adapter.run { isLastPage && (before + itemCount) == adapter.offset }),
         )
         offsetJob?.cancel()
         candidatesSubmitJob?.cancel()