feat(ReadBook): 添加跳转进度恢复

app/src/main/java/io/legado/app/model/ReadBook.kt

@@ -42,6 +42,30 @@ object ReadBook : CoroutineScope by MainScope() {
     private val loadingChapters = arrayListOf<Int>()
     private val readRecord = ReadRecord()
     var readStartTime: Long = System.currentTimeMillis()
+    /* 跳转历史记录 */
+    var bookProgressHistory: List<BookProgress>? = null
+    /* 跳转进度前进度记录 */
+    var lastBookPress: BookProgress? = null
+
+    //暂时保存跳转前进度
+    fun saveCurrentBookProcess() {
+        lastBookPress = book?.let { BookProgress(it) }
+    }
+    //恢复跳转前进度
+    fun restoreLastBookProcess() {
+        lastBookPress?.let {
+            durChapterPos = it.durChapterPos
+            if (durChapterIndex != it.durChapterIndex) {
+                clearTextChapter()
+                durChapterIndex = it.durChapterIndex
+            }
+            callBack?.upContent()
+            saveRead()
+            loadContent(resetPageOffset = true) {
+                lastBookPress = null
+            }
+        }
+    }
 
     fun resetData(book: Book) {
         ReadBook.book = book
@@ -55,6 +79,7 @@ object ReadBook : CoroutineScope by MainScope() {
         callBack?.upMenuView()
         callBack?.upPageAnim()
         upWebBook(book)
+        lastBookPress = null
         synchronized(this) {
             loadingChapters.clear()
         }

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -926,13 +926,6 @@ class ReadBookActivity : BaseReadBookActivity(),
         }
     }
 
-    /**
-     * 跳转到指定章节
-     */
-    override fun skipToChapter(index: Int) {
-        viewModel.openChapter(index)
-    }
-
     /**
      * 打开搜索界面
      */
@@ -1141,11 +1134,20 @@ class ReadBookActivity : BaseReadBookActivity(),
         }
     }
 
+    /* 回复到 全文搜索/进度条跳转前的位置 */
+
+    /* 进度条跳转到指定章节 */
+    override fun skipToChapter(index: Int) {
+        viewModel.openChapter(index)
+    }
+
+    /* 全文搜索跳转 */
     override fun navigateToSearch(searchResult: SearchResult, index: Int) {
         viewModel.searchResultIndex = index
         skipToSearch(searchResult)
     }
 
+    /* 全文搜索跳转 */
     private fun skipToSearch(searchResult: SearchResult) {
         val previousResult = binding.searchMenu.previousSearchResult