feat: 优化代码

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

@@ -92,6 +92,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         }
         if (!ReadBookConfig.isScroll) return
         //滚动翻页
+        if (!pageFactory.hasNext()) return
         val nextPage = relativePage(1)
         relativeOffset = relativeOffset(1)
         nextPage.textLines.forEach { textLine ->
@@ -108,6 +109,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                 textLine.isReadAloud
             )
         }
+        if (!pageFactory.hasNextPlus()) return
         relativeOffset = relativeOffset(2)
         if (relativeOffset < ChapterProvider.visibleHeight) {
             relativePage(2).textLines.forEach { textLine ->

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

@@ -22,4 +22,5 @@ abstract class PageFactory<DATA>(protected val dataSource: DataSource) {
 
     abstract fun hasPrev(): Boolean
 
+    abstract fun hasNextPlus(): Boolean
 }

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

@@ -13,6 +13,10 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
         return hasNextChapter() || currentChapter?.isLastIndex(pageIndex) != true
     }
 
+    override fun hasNextPlus(): Boolean = with(dataSource) {
+        return hasNextChapter() || pageIndex < (currentChapter?.pageSize() ?: 1) - 2
+    }
+
     override fun moveToFirst() {
         ReadBook.setPageIndex(0)
     }
@@ -86,9 +90,6 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
                         ?: TextPage(title = it.title).format()
                 }
             }
-            if (!hasPrevChapter()) {
-                return@with TextPage(text = "")
-            }
             prevChapter?.let {
                 return@with it.lastPage()?.removePageAloudSpan()
                     ?: TextPage(title = it.title).format()
@@ -103,9 +104,6 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
                     return@with it.page(pageIndex + 2)?.removePageAloudSpan()
                         ?: TextPage(title = it.title).format()
                 }
-                if (!hasNextChapter()) {
-                    TextPage(text = "")
-                }
                 nextChapter?.let { nc ->
                     if (pageIndex < it.pageSize() - 1) {
                         return@with nc.page(0)?.removePageAloudSpan()