Added delegate callback for removing downloads

Should close #551 and other related A11 issues

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.kt

@@ -10,6 +10,9 @@ import eu.kanade.tachiyomi.data.download.model.DownloadQueue
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.source.model.Page
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import rx.Observable
 import timber.log.Timber
 import uy.kohesive.injekt.injectLazy
@@ -228,11 +231,12 @@ class DownloadManager(val context: Context) {
      * @param source the source of the chapters.
      */
     fun deleteChapters(chapters: List<Chapter>, manga: Manga, source: Source) {
+        GlobalScope.launch(Dispatchers.IO) {
             val wasPaused = isPaused()
             if (chapters.isEmpty()) {
                 DownloadService.stop(context)
                 downloader.queue.clear()
-            return
+                return@launch
             }
             downloader.pause()
             downloader.queue.remove(chapters)
@@ -245,12 +249,17 @@ class DownloadManager(val context: Context) {
                 downloader.stop()
             }
             queue.remove(chapters)
-        val chapterDirs = provider.findChapterDirs(chapters, manga, source) + provider.findTempChapterDirs(chapters, manga, source)
+            val chapterDirs =
+                provider.findChapterDirs(chapters, manga, source) + provider.findTempChapterDirs(
+                    chapters, manga, source
+                )
             chapterDirs.forEach { it.delete() }
             cache.removeChapters(chapters, manga)
             if (cache.getDownloadCount(manga, true) == 0) { // Delete manga directory if empty
                 chapterDirs.firstOrNull()?.parentFile?.delete()
             }
+            queue.updateListeners()
+        }
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadService.kt

@@ -57,6 +57,7 @@ class DownloadService : Service() {
                 it.downloadStatusChanged(downloading ?: downloadManager.hasQueue())
             }
         }
+
         /**
          * Starts this service.
          *

app/src/main/java/eu/kanade/tachiyomi/data/download/model/DownloadQueue.kt

@@ -45,6 +45,10 @@ List<Download> by queue {
         }
     }
 
+    fun updateListeners() {
+        downloadListeners.forEach { it.updateDownloads() }
+    }
+
     fun remove(chapter: Chapter) {
         find { it.chapter.id == chapter.id }?.let { remove(it) }
     }
@@ -138,5 +142,6 @@ List<Download> by queue {
 
     interface DownloadListener {
         fun updateDownload(download: Download)
+        fun updateDownloads()
     }
 }

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaDetailsPresenter.kt

@@ -165,6 +165,15 @@ class MangaDetailsPresenter(
         }
     }
 
+    override fun updateDownloads() {
+        scope.launch(Dispatchers.Default) {
+            updateChapters(chapters)
+            withContext(Dispatchers.Main) {
+                controller.updateChapters(chapters)
+            }
+        }
+    }
+
     /**
      * Converts a chapter from the database to an extended model, allowing to store new fields.
      */
@@ -266,12 +275,8 @@ class MangaDetailsPresenter(
      */
     fun deleteChapter(chapter: ChapterItem) {
         downloadManager.deleteChapters(listOf(chapter), manga, source)
-        val downloads = downloadManager.queue.toMutableList()
-        downloads.remove(chapter.download)
-        downloadManager.reorderQueue(downloads)
-
         this.chapters.find { it.id == chapter.id }?.apply {
-            status = Download.NOT_DOWNLOADED
+            status = Download.QUEUE
             download = null
         }
 
@@ -284,10 +289,9 @@ class MangaDetailsPresenter(
      */
     fun deleteChapters(chapters: List<ChapterItem>, update: Boolean = true) {
         downloadManager.deleteChapters(chapters, manga, source)
-
         chapters.forEach { chapter ->
             this.chapters.find { it.id == chapter.id }?.apply {
-                status = Download.NOT_DOWNLOADED
+                status = Download.QUEUE
                 download = null
             }
         }

app/src/main/java/eu/kanade/tachiyomi/ui/recent_updates/RecentChaptersPresenter.kt

@@ -82,6 +82,15 @@ class RecentChaptersPresenter(
         }
     }
 
+    override fun updateDownloads() {
+        scope.launch {
+            setDownloadedChapters(chapters)
+            withContext(Dispatchers.Main) {
+                controller.onNextRecentChapters(chapters)
+            }
+        }
+    }
+
     override fun onUpdateManga(manga: LibraryManga) {
         getUpdates()
     }

app/src/main/java/eu/kanade/tachiyomi/ui/recents/RecentsPresenter.kt

@@ -241,6 +241,15 @@ class RecentsPresenter(
         }
     }
 
+    override fun updateDownloads() {
+        scope.launch {
+            setDownloadedChapters(recentItems)
+            withContext(Dispatchers.Main) {
+                controller.showLists(recentItems)
+            }
+        }
+    }
+
     override fun onUpdateManga(manga: LibraryManga) {
         if (manga.id == null && !LibraryUpdateService.isRunning()) {
             scope.launch(Dispatchers.Main) { controller.setRefreshing(false) }