up

app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt

@@ -249,11 +249,19 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         return viewModel.durChapterIndex
     }
 
-    override fun durChapterPos(pageSize: Int): Int {
-        if (viewModel.durPageIndex < pageSize) {
+    override fun durChapterPos(): Int {
+        viewModel.curTextChapter?.let {
+            if (viewModel.durPageIndex < it.pageSize()) {
                 return viewModel.durPageIndex
             }
-        return pageSize - 1
+            return it.pageSize() - 1
+        }
+        return viewModel.durPageIndex
+    }
+
+    override fun setPageIndex(pageIndex: Int) {
+        viewModel.durPageIndex = pageIndex
+        viewModel.saveRead()
     }
 
     override fun textChapter(chapterOnDur: Int): TextChapter? {

app/src/main/java/io/legado/app/ui/widget/page/DataSource.kt

@@ -4,6 +4,10 @@ import io.legado.app.data.entities.BookChapter
 
 interface DataSource {
 
+    fun pageIndex(): Int
+
+    fun setPageIndex(pageIndex: Int)
+
     fun isPrepared(): Boolean
 
     fun getChapterPosition(): Int

app/src/main/java/io/legado/app/ui/widget/page/PageView.kt

@@ -33,6 +33,14 @@ class PageView(context: Context, attrs: AttributeSet) : FrameLayout(context, att
         pageDelegate = SlidePageDelegate(this)
 
         setPageFactory(TextPageFactory.create(object : DataSource {
+            override fun pageIndex(): Int {
+                return callback?.durChapterPos() ?: 0
+            }
+
+            override fun setPageIndex(pageIndex: Int) {
+                callback?.setPageIndex(pageIndex)
+            }
+
             override fun isPrepared(): Boolean {
                 TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
             }
@@ -107,25 +115,25 @@ class PageView(context: Context, attrs: AttributeSet) : FrameLayout(context, att
             when (chapterOnDur) {
                 0 -> {
                     cb.textChapter()?.let {
-                        curPage?.setContent(it.page(cb.durChapterPos(it.pageSize())))
-                        if (cb.durChapterPos(it.pageSize()) > 0) {
-                            prevPage?.setContent(it.page(cb.durChapterPos(it.pageSize()) - 1))
+                        curPage?.setContent(it.page(cb.durChapterPos()))
+                        if (cb.durChapterPos() > 0) {
+                            prevPage?.setContent(it.page(cb.durChapterPos().minus(1)))
                         }
-                        if (cb.durChapterPos(it.pageSize()) < it.pageSize() - 1) {
-                            nextPage?.setContent(it.page(cb.durChapterPos(it.pageSize()) + 1))
+                        if (cb.durChapterPos() < it.pageSize().minus(1)) {
+                            nextPage?.setContent(it.page(cb.durChapterPos().plus(1)))
                         }
                     }
                 }
                 1 -> {
                     cb.textChapter()?.let {
-                        if (cb.durChapterPos(it.pageSize()) == it.pageSize() - 1) {
+                        if (cb.durChapterPos() == it.pageSize().minus(1)) {
                             nextPage?.setContent(cb.textChapter(1)?.page(0))
                         }
                     }
                 }
                 -1 -> {
                     cb.textChapter()?.let {
-                        if (cb.durChapterPos(it.pageSize()) == 0) {
+                        if (cb.durChapterPos() == 0) {
                             prevPage?.setContent(cb.textChapter(-1)?.lastPage())
                         }
                     }
@@ -206,10 +214,11 @@ class PageView(context: Context, attrs: AttributeSet) : FrameLayout(context, att
     interface CallBack {
         fun chapterSize(): Int
         fun durChapterIndex(): Int
-        fun durChapterPos(pageSize: Int): Int
+        fun durChapterPos(): Int
         fun textChapter(chapterOnDur: Int = 0): TextChapter?
         fun loadChapter(index: Int)
         fun moveToNextChapter()
         fun moveToPrevChapter()
+        fun setPageIndex(pageIndex: Int)
     }
 }

app/src/main/java/io/legado/app/ui/widget/page/TextPageFactory.kt

@@ -9,8 +9,6 @@ class TextPageFactory private constructor(dataSource: DataSource) :
         }
     }
 
-    var index: Int = 0
-
     override fun hasPrev(): Boolean {
         return true
     }
@@ -24,51 +22,51 @@ class TextPageFactory private constructor(dataSource: DataSource) :
     }
 
     override fun moveToFirst() {
-        index = 0
+        dataSource.setPageIndex(0)
     }
 
     override fun moveToLast() {
-        index = dataSource.getCurrentChapter()?.let {
+        dataSource.getCurrentChapter()?.let {
             if (it.pageSize() == 0) {
-                0
+                dataSource.setPageIndex(0)
             } else {
-                it.pageSize() - 1
+                dataSource.setPageIndex(it.pageSize().minus(1))
             }
-        } ?: 0
+        } ?: dataSource.setPageIndex(0)
     }
 
-    override fun moveToNext(): Boolean {
+    override fun moveToNext(): Boolean = dataSource.pageIndex().let { index ->
         return if (hasNext()) {
-            index = if (dataSource.getCurrentChapter()?.isLastIndex(index) == true) {
+            if (dataSource.getCurrentChapter()?.isLastIndex(index) == true) {
                 dataSource.moveToNextChapter()
-                0
+                dataSource.setPageIndex(0)
             } else {
-                index.plus(1)
+                dataSource.setPageIndex(index.plus(1))
             }
             true
         } else
             false
     }
 
-    override fun moveToPrevious(): Boolean {
+    override fun moveToPrevious(): Boolean = dataSource.pageIndex().let { index ->
         return if (hasPrev()) {
-            index = if (index > 0) {
-                index.minus(1)
+            if (index > 0) {
+                dataSource.setPageIndex(index.minus(1))
             } else {
                 dataSource.moveToPrevChapter()
-                dataSource.getPreviousChapter()?.lastIndex() ?: 0
+                dataSource.setPageIndex(dataSource.getPreviousChapter()?.lastIndex() ?: 0)
             }
             true
         } else
             false
     }
 
-    override fun currentPage(): TextPage? {
+    override fun currentPage(): TextPage? = dataSource.pageIndex().let { index ->
         return dataSource.getCurrentChapter()?.page(index)
             ?: TextPage(index, "index：$index", "index：$index")
     }
 
-    override fun nextPage(): TextPage? {
+    override fun nextPage(): TextPage? = dataSource.pageIndex().let { index ->
         dataSource.getCurrentChapter()?.let {
             if (index < it.pageSize() - 1) {
                 return dataSource.getCurrentChapter()?.page(index + 1)
@@ -79,7 +77,7 @@ class TextPageFactory private constructor(dataSource: DataSource) :
             ?: TextPage(index + 1, "index：${index + 1}", "index：${index + 1}")
     }
 
-    override fun previousPage(): TextPage? {
+    override fun previousPage(): TextPage? = dataSource.pageIndex().let { index ->
         if (index > 0) {
             return dataSource.getCurrentChapter()?.page(index - 1)
                 ?: TextPage(index - 1, "index：${index - 1}", "index：${index - 1}")