refactor: Use Compose for reader chapter transition

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ArchivePageLoader.kt

@@ -11,6 +11,8 @@ import yokai.core.archive.ArchiveReader
  */
 internal class ArchivePageLoader(private val reader: ArchiveReader) : PageLoader() {
 
+    override val isLocal: Boolean = true
+
     /**
      * Recycles this loader and the open archive.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DirectoryPageLoader.kt

@@ -11,6 +11,8 @@ import eu.kanade.tachiyomi.util.system.ImageUtil
  */
 class DirectoryPageLoader(val file: UniFile) : PageLoader() {
 
+    override val isLocal: Boolean = true
+
     /**
      * Returns the pages found on this directory ordered with a natural comparator.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/DownloadPageLoader.kt

@@ -24,6 +24,8 @@ class DownloadPageLoader(
     private val downloadProvider: DownloadProvider,
 ) : PageLoader() {
 
+    override val isLocal: Boolean = true
+
     // Needed to open input streams
     private val context: Application by injectLazy()
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/EpubPageLoader.kt

@@ -10,6 +10,8 @@ import yokai.core.archive.ArchiveReader
  */
 class EpubPageLoader(reader: ArchiveReader) : PageLoader() {
 
+    override val isLocal: Boolean = true
+
     /**
      * The epub file.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/HttpPageLoader.kt

@@ -8,6 +8,9 @@ import eu.kanade.tachiyomi.ui.reader.model.ReaderChapter
 import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
 import eu.kanade.tachiyomi.util.system.launchIO
 import eu.kanade.tachiyomi.util.system.withIOContext
+import java.util.concurrent.PriorityBlockingQueue
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.math.min
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -19,9 +22,6 @@ import kotlinx.coroutines.runInterruptible
 import kotlinx.coroutines.suspendCancellableCoroutine
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
-import java.util.concurrent.*
-import java.util.concurrent.atomic.*
-import kotlin.math.min
 
 /**
  * Loader used to load chapters from an online source.
@@ -33,6 +33,8 @@ class HttpPageLoader(
     private val preferences: PreferencesHelper = Injekt.get(),
 ) : PageLoader() {
 
+    override val isLocal: Boolean = false
+
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
 
     /**

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/PageLoader.kt

@@ -9,6 +9,8 @@ import eu.kanade.tachiyomi.ui.reader.model.ReaderPage
  */
 abstract class PageLoader {
 
+    abstract val isLocal: Boolean
+
     /**
      * Whether this loader has been already recycled.
      */

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderTransitionView.kt

@@ -1,32 +1,31 @@
 package eu.kanade.tachiyomi.ui.reader.viewer
 
 import android.content.Context
-import android.text.SpannableStringBuilder
-import android.text.style.ImageSpan
 import android.util.AttributeSet
 import android.view.LayoutInflater
-import android.widget.LinearLayout
+import androidx.compose.material3.LocalContentColor
-import androidx.annotation.ColorInt
+import androidx.compose.material3.LocalTextStyle
-import androidx.core.text.bold
+import androidx.compose.material3.MaterialTheme
-import androidx.core.text.buildSpannedString
+import androidx.compose.runtime.Composable
-import androidx.core.text.inSpans
+import androidx.compose.runtime.CompositionLocalProvider
-import androidx.core.view.isVisible
+import androidx.compose.runtime.getValue
-import eu.kanade.tachiyomi.R
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.platform.AbstractComposeView
 import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.databinding.ReaderTransitionViewBinding
 import eu.kanade.tachiyomi.domain.manga.models.Manga
 import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
-import eu.kanade.tachiyomi.util.chapter.ChapterUtil.Companion.preferredChapterName
+import eu.kanade.tachiyomi.util.isLocal
-import eu.kanade.tachiyomi.util.system.contextCompatDrawable
-import eu.kanade.tachiyomi.util.system.dpToPx
 import uy.kohesive.injekt.injectLazy
-import yokai.i18n.MR
+import yokai.presentation.reader.ChapterTransition
-import yokai.util.lang.getString
+import yokai.presentation.theme.YokaiTheme
-import kotlin.math.roundToInt
 
 class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
-    LinearLayout(context, attrs) {
+    AbstractComposeView(context, attrs) {
+
+    private var data: Data? by mutableStateOf(null)
 
     private val binding: ReaderTransitionViewBinding =
         ReaderTransitionViewBinding.inflate(LayoutInflater.from(context), this, true)
@@ -37,101 +36,55 @@ class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: At
     }
 
     fun bind(transition: ChapterTransition, downloadManager: DownloadManager, manga: Manga?) {
-        manga ?: return
+        data = if (manga != null) {
-        when (transition) {
+            Data(
-            is ChapterTransition.Prev -> bindPrevChapterTransition(transition, downloadManager, manga)
+                manga = manga,
-            is ChapterTransition.Next -> bindNextChapterTransition(transition, downloadManager, manga)
+                transition = transition,
-        }
+                currChapterDownloaded = transition.from.pageLoader?.isLocal == true,
-
+                goingToChapterDownloaded = manga.isLocal() ||
-        missingChapterWarning(transition)
+                    transition.to?.chapter?.let { goingToChapter ->
-    }
+                        downloadManager.isChapterDownloaded(
-
+                            chapter = goingToChapter,
-    /**
+                            manga = manga,
-     * Binds a previous chapter transition on this view and subscribes to the page load status.
+                            skipCache = true,
-     */
-    private fun bindPrevChapterTransition(
-        transition: ChapterTransition,
-        downloadManager: DownloadManager,
-        manga: Manga,
-    ) {
-        val prevChapter = transition.to
-
-        binding.lowerText.isVisible = prevChapter != null
-        if (prevChapter != null) {
-            binding.upperText.textAlignment = TEXT_ALIGNMENT_TEXT_START
-            val isPrevDownloaded = downloadManager.isChapterDownloaded(prevChapter.chapter, manga)
-            val isCurrentDownloaded = downloadManager.isChapterDownloaded(transition.from.chapter, manga)
-            binding.upperText.text = buildSpannedString {
-                bold { append(context.getString(MR.strings.previous_title)) }
-                append("\n${prevChapter.chapter.preferredChapterName(context, manga, preferences)}")
-                if (isPrevDownloaded != isCurrentDownloaded) addDLImageSpan(isPrevDownloaded)
-            }
-            binding.lowerText.text = buildSpannedString {
-                bold { append(context.getString(MR.strings.current_chapter)) }
-                val name = transition.from.chapter.preferredChapterName(context, manga, preferences)
-                append("\n$name")
-            }
-        } else {
-            binding.upperText.textAlignment = TEXT_ALIGNMENT_CENTER
-            binding.upperText.text = context.getString(MR.strings.theres_no_previous_chapter)
-        }
-    }
-
-    /**
-     * Binds a next chapter transition on this view and subscribes to the load status.
-     */
-    private fun bindNextChapterTransition(
-        transition: ChapterTransition,
-        downloadManager: DownloadManager,
-        manga: Manga,
-    ) {
-        val nextChapter = transition.to
-
-        binding.lowerText.isVisible = nextChapter != null
-        if (nextChapter != null) {
-            binding.upperText.textAlignment = TEXT_ALIGNMENT_TEXT_START
-            val isCurrentDownloaded = downloadManager.isChapterDownloaded(transition.from.chapter, manga)
-            val isNextDownloaded = downloadManager.isChapterDownloaded(nextChapter.chapter, manga)
-            binding.upperText.text = buildSpannedString {
-                bold { append(context.getString(MR.strings.finished_chapter)) }
-                val name = transition.from.chapter.preferredChapterName(context, manga, preferences)
-                append("\n$name")
-            }
-            binding.lowerText.text = buildSpannedString {
-                bold { append(context.getString(MR.strings.next_title)) }
-                append("\n${nextChapter.chapter.preferredChapterName(context, manga, preferences)}")
-                if (isNextDownloaded != isCurrentDownloaded) addDLImageSpan(isNextDownloaded)
-            }
-        } else {
-            binding.upperText.textAlignment = TEXT_ALIGNMENT_CENTER
-            binding.upperText.text = context.getString(MR.strings.theres_no_next_chapter)
-        }
-    }
-
-    private fun SpannableStringBuilder.addDLImageSpan(isDownloaded: Boolean) {
-        val icon = context.contextCompatDrawable(
-            if (isDownloaded) R.drawable.ic_file_download_24dp else R.drawable.ic_cloud_24dp,
                         )
-            ?.mutate()
+                    } ?: false,
-            ?.apply {
+            )
-                val size = binding.lowerText.textSize + 4f.dpToPx
+        } else {
-                setTint(binding.lowerText.currentTextColor)
+            null
-                setBounds(0, 0, size.roundToInt(), size.roundToInt())
+        }
-            } ?: return
-        append(" ")
-        inSpans(ImageSpan(icon)) { append("image") }
     }
 
-    fun setTextColors(@ColorInt color: Int) {
+    @Composable
-        binding.upperText.setTextColor(color)
+    override fun Content() {
-        binding.warningText.setTextColor(color)
+        data?.let {
-        binding.lowerText.setTextColor(color)
+            YokaiTheme {
+                CompositionLocalProvider (
+                    LocalTextStyle provides MaterialTheme.typography.bodySmall,
+                    LocalContentColor provides MaterialTheme.colorScheme.onBackground,
+                ) {
+                    ChapterTransition(
+                        manga = it.manga,
+                        transition = it.transition,
+                        currChapterDownloaded = it.currChapterDownloaded,
+                        goingToChapterDownloaded = it.goingToChapterDownloaded,
+                    )
+                }
+            }
+        }
     }
 
-    private fun missingChapterWarning(transition: ChapterTransition) {
+    private data class Data(
+        val manga: Manga,
+        val transition: ChapterTransition,
+        val currChapterDownloaded: Boolean,
+        val goingToChapterDownloaded: Boolean,
+    )
+}
+
+fun missingChapterCount(transition: ChapterTransition): Int {
     if (transition.to == null) {
-            binding.warning.isVisible = false
+        return 0
-            return
     }
 
     val hasMissingChapters = when (transition) {
@@ -140,8 +93,7 @@ class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: At
     }
 
     if (!hasMissingChapters) {
-            binding.warning.isVisible = false
+        return 0
-            return
     }
 
     val chapterDifference = when (transition) {
@@ -149,7 +101,5 @@ class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: At
         is ChapterTransition.Next -> calculateChapterDifference(transition.to, transition.from)
     }
 
-        binding.warningText.text = context.getString(MR.plurals.missing_chapters_warning, chapterDifference.toInt(), chapterDifference.toInt())
+    return chapterDifference.toInt()
-        binding.warning.isVisible = true
-    }
 }

app/src/main/java/eu/kanade/tachiyomi/util/chapter/ChapterUtil.kt

@@ -3,6 +3,8 @@ package eu.kanade.tachiyomi.util.chapter
 import android.content.Context
 import android.content.res.ColorStateList
 import android.widget.TextView
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
 import androidx.core.graphics.ColorUtils
 import androidx.core.widget.TextViewCompat
 import androidx.vectordrawable.graphics.drawable.VectorDrawableCompat
@@ -19,6 +21,8 @@ import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.timeSpanFromNow
 import java.text.DecimalFormat
 import java.text.DecimalFormatSymbols
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
 import yokai.i18n.MR
 import yokai.util.lang.getString
 
@@ -182,5 +186,12 @@ class ChapterUtil {
                 name
             }
         }
+
+        @Composable
+        fun Chapter.preferredChapterName(manga: Manga): String {
+            val preferences: PreferencesHelper = Injekt.get()
+            val context = LocalContext.current
+            return preferredChapterName(context, manga, preferences)
+        }
     }
 }

app/src/main/java/yokai/presentation/reader/ChapterTransition.kt

@@ -0,0 +1,299 @@
+package yokai.presentation.reader
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.text.InlineTextContent
+import androidx.compose.foundation.text.appendInlineContent
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Cloud
+import androidx.compose.material.icons.outlined.Info
+import androidx.compose.material.icons.outlined.Warning
+import androidx.compose.material3.CardColors
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedCard
+import androidx.compose.material3.ProvideTextStyle
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.Placeholder
+import androidx.compose.ui.text.PlaceholderVerticalAlign
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import dev.icerock.moko.resources.compose.pluralStringResource
+import dev.icerock.moko.resources.compose.stringResource
+import eu.kanade.tachiyomi.data.database.models.Chapter
+import eu.kanade.tachiyomi.domain.manga.models.Manga
+import eu.kanade.tachiyomi.ui.reader.model.ChapterTransition
+import eu.kanade.tachiyomi.ui.reader.viewer.missingChapterCount
+import eu.kanade.tachiyomi.util.chapter.ChapterUtil.Companion.preferredChapterName
+import kotlinx.collections.immutable.persistentMapOf
+import yokai.i18n.MR
+import yokai.presentation.core.util.secondaryItemAlpha
+
+@Composable
+fun ChapterTransition(
+    manga: Manga,
+    transition: ChapterTransition,
+    currChapterDownloaded: Boolean,
+    goingToChapterDownloaded: Boolean,
+) {
+    val currChapter = transition.from.chapter
+    val goingToChapter = transition.to?.chapter
+    val chapterGap = missingChapterCount(transition)
+
+    ProvideTextStyle(MaterialTheme.typography.bodyMedium) {
+        when (transition) {
+            is ChapterTransition.Prev -> {
+                TransitionText(
+                    manga = manga,
+                    topLabel = stringResource(MR.strings.previous_title),
+                    topChapter = goingToChapter,
+                    topChapterDownloaded = goingToChapterDownloaded,
+                    bottomLabel = stringResource(MR.strings.current_chapter),
+                    bottomChapter = currChapter,
+                    bottomChapterDownloaded = currChapterDownloaded,
+                    fallbackLabel = stringResource(MR.strings.theres_no_previous_chapter),
+                    chapterGap = chapterGap,
+                )
+            }
+            is ChapterTransition.Next -> {
+                TransitionText(
+                    manga = manga,
+                    topLabel = stringResource(MR.strings.finished_chapter),
+                    topChapter = currChapter,
+                    topChapterDownloaded = currChapterDownloaded,
+                    bottomLabel = stringResource(MR.strings.next_title),
+                    bottomChapter = goingToChapter,
+                    bottomChapterDownloaded = goingToChapterDownloaded,
+                    fallbackLabel = stringResource(MR.strings.theres_no_next_chapter),
+                    chapterGap = chapterGap,
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun TransitionText(
+    manga: Manga,
+    topLabel: String,
+    topChapter: Chapter?,
+    topChapterDownloaded: Boolean,
+    bottomLabel: String,
+    bottomChapter: Chapter?,
+    bottomChapterDownloaded: Boolean,
+    fallbackLabel: String,
+    chapterGap: Int,
+) {
+    Column (
+        modifier = Modifier
+            .widthIn(max = 460.dp)
+            .fillMaxWidth(),
+    ) {
+        if (topChapter != null) {
+            ChapterText(
+                header = topLabel,
+                name = topChapter.preferredChapterName(manga),
+                scanlator = topChapter.scanlator,
+                otherDownloaded = bottomChapterDownloaded,
+                downloaded = topChapterDownloaded,
+            )
+
+            Spacer(Modifier.height(VerticalSpacerSize))
+        } else {
+            NoChapterNotification(
+                text = fallbackLabel,
+                modifier = Modifier.align(Alignment.CenterHorizontally),
+            )
+        }
+
+        if (bottomChapter != null) {
+            if (chapterGap > 0) {
+                ChapterGapWarning(
+                    gapCount = chapterGap,
+                    modifier = Modifier.align(Alignment.CenterHorizontally),
+                )
+            }
+
+            Spacer(Modifier.height(VerticalSpacerSize))
+
+            ChapterText(
+                header = bottomLabel,
+                name = bottomChapter.preferredChapterName(manga),
+                scanlator = bottomChapter.scanlator,
+                otherDownloaded = topChapterDownloaded,
+                downloaded = bottomChapterDownloaded,
+            )
+        } else {
+            NoChapterNotification(
+                text = fallbackLabel,
+                modifier = Modifier.align(Alignment.CenterHorizontally),
+            )
+        }
+    }
+}
+
+@Composable
+private fun NoChapterNotification(
+    text: String,
+    modifier: Modifier = Modifier,
+) {
+    OutlinedCard (
+        modifier = modifier,
+        colors = CardColor,
+    ) {
+        Row (
+            modifier = Modifier
+                .padding(horizontal = 16.dp, vertical = 12.dp),
+            horizontalArrangement = Arrangement.spacedBy(16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Icon(
+                imageVector = Icons.Outlined.Info,
+                tint = MaterialTheme.colorScheme.primary,
+                contentDescription = null,
+            )
+
+            Text(
+                text = text,
+                style = MaterialTheme.typography.bodyMedium,
+            )
+        }
+    }
+}
+
+@Composable
+private fun ChapterGapWarning(
+    gapCount: Int,
+    modifier: Modifier = Modifier,
+) {
+    OutlinedCard(
+        modifier = modifier,
+        colors = CardColor,
+    ) {
+        Row(
+            modifier = Modifier.padding(horizontal = 16.dp, vertical = 12.dp),
+            horizontalArrangement = Arrangement.spacedBy(16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Icon(
+                imageVector = Icons.Outlined.Warning,
+                tint = MaterialTheme.colorScheme.error,
+                contentDescription = null,
+            )
+
+            Text(
+                text = pluralStringResource(MR.plurals.missing_chapters_warning, quantity = gapCount, gapCount),
+                style = MaterialTheme.typography.bodyMedium,
+            )
+        }
+    }
+}
+
+@Composable
+private fun ChapterHeaderText(
+    text: String,
+    modifier: Modifier = Modifier,
+) {
+    Text(
+        text = text,
+        modifier = modifier,
+        style = MaterialTheme.typography.titleMedium,
+    )
+}
+
+@Composable
+private fun ChapterText(
+    header: String,
+    name: String,
+    scanlator: String?,
+    otherDownloaded: Boolean,
+    downloaded: Boolean,
+) {
+    Column {
+        ChapterHeaderText(
+            text = header,
+            modifier = Modifier.padding(bottom = 4.dp),
+        )
+
+        Text(
+            text = buildAnnotatedString {
+                if (downloaded || otherDownloaded) {
+                    if (downloaded) {
+                        appendInlineContent(DOWNLOADED_ICON_ID)
+                    } else {
+                        appendInlineContent(ONLINE_ICON_ID)
+                    }
+                    append(' ')
+                }
+                append(name)
+            },
+            fontSize = 20.sp,
+            maxLines = 5,
+            overflow = TextOverflow.Ellipsis,
+            style = MaterialTheme.typography.titleLarge,
+            inlineContent = persistentMapOf(
+                DOWNLOADED_ICON_ID to InlineTextContent(
+                    Placeholder(
+                        width = 22.sp,
+                        height = 22.sp,
+                        placeholderVerticalAlign = PlaceholderVerticalAlign.Center,
+                    ),
+                ) {
+                    Icon(
+                        imageVector = Icons.Filled.CheckCircle,
+                        contentDescription = stringResource(MR.strings.downloaded),
+                    )
+                },
+                ONLINE_ICON_ID to InlineTextContent(
+                    Placeholder(
+                        width = 22.sp,
+                        height = 22.sp,
+                        placeholderVerticalAlign = PlaceholderVerticalAlign.Center,
+                    ),
+                ) {
+                    Icon(
+                        imageVector = Icons.Filled.Cloud,
+                        contentDescription = stringResource(MR.strings.not_downloaded),
+                    )
+                },
+            ),
+        )
+
+        scanlator?.let {
+            Text(
+                text = it,
+                modifier = Modifier
+                    .secondaryItemAlpha()
+                    .padding(top = 2.dp),
+                maxLines = 2,
+                overflow = TextOverflow.Ellipsis,
+                style = MaterialTheme.typography.bodySmall,
+            )
+        }
+    }
+}
+
+private val CardColor: CardColors
+    @Composable
+    get() = CardDefaults.outlinedCardColors(
+        containerColor = Color.Transparent,
+        contentColor = MaterialTheme.colorScheme.onSurface,
+    )
+
+private val VerticalSpacerSize = 24.dp
+private const val DOWNLOADED_ICON_ID = "downloaded"
+private const val ONLINE_ICON_ID = "online"