feat: 优化代码

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

@@ -156,6 +156,13 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         }
 
         pageOffset += offset
+        if (pageOffset > 0) {
+            pageFactory.moveToPrev()
+            pageOffset -= textPage.height
+        } else if (pageOffset < -textPage.height) {
+            pageOffset += textPage.height
+            pageFactory.moveToNext()
+        }
         invalidate()
     }
 

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

@@ -8,7 +8,7 @@ abstract class PageFactory<DATA>(protected val dataSource: DataSource) {
 
     abstract fun moveToNext():Boolean
 
-    abstract fun moveToPrevious(): Boolean
+    abstract fun moveToPrev(): Boolean
 
     abstract val nextPage: DATA?
 

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

@@ -74,7 +74,7 @@ class PageView(context: Context, attrs: AttributeSet) :
     fun fillPage(direction: PageDelegate.Direction) {
         when (direction) {
             PageDelegate.Direction.PREV -> {
-                pageFactory.moveToPrevious()
+                pageFactory.moveToPrev()
                 upContent()
             }
             PageDelegate.Direction.NEXT -> {

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

@@ -29,8 +29,7 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
 
     override fun moveToNext(): Boolean = with(dataSource) {
         return if (hasNext()) {
-            if (getCurrentChapter()?.isLastIndex(pageIndex) == true
-            ) {
+            if (getCurrentChapter()?.isLastIndex(pageIndex) == true) {
                 ReadBook.moveToNextChapter(false)
             } else {
                 setPageIndex(pageIndex.plus(1))
@@ -40,7 +39,7 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
             false
     }
 
-    override fun moveToPrevious(): Boolean = with(dataSource) {
+    override fun moveToPrev(): Boolean = with(dataSource) {
         return if (hasPrev()) {
             if (pageIndex <= 0) {
                 ReadBook.moveToPrevChapter(false)
@@ -54,26 +53,26 @@ class TextPageFactory(dataSource: DataSource) : PageFactory<TextPage>(dataSource
 
     override val currentPage: TextPage?
         get() = with(dataSource) {
-        return getCurrentChapter()?.page(pageIndex)
-    }
+            return getCurrentChapter()?.page(pageIndex)
+        }
 
     override val nextPage: TextPage?
         get() = with(dataSource) {
-        getCurrentChapter()?.let {
-            if (pageIndex < it.pageSize() - 1) {
-                return getCurrentChapter()?.page(pageIndex + 1)?.removePageAloudSpan()
+            getCurrentChapter()?.let {
+                if (pageIndex < it.pageSize() - 1) {
+                    return getCurrentChapter()?.page(pageIndex + 1)?.removePageAloudSpan()
+                }
             }
+            return getNextChapter()?.page(0)?.removePageAloudSpan()
         }
-        return getNextChapter()?.page(0)?.removePageAloudSpan()
-    }
 
     override val prevPage: TextPage?
         get() = with(dataSource) {
-        if (pageIndex > 0) {
-            return getCurrentChapter()?.page(pageIndex - 1)?.removePageAloudSpan()
+            if (pageIndex > 0) {
+                return getCurrentChapter()?.page(pageIndex - 1)?.removePageAloudSpan()
+            }
+            return getPreviousChapter()?.lastPage()?.removePageAloudSpan()
         }
-        return getPreviousChapter()?.lastPage()?.removePageAloudSpan()
-    }
 
 
 }