feat: 优化代码

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

@@ -163,24 +163,20 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         }
 
         pageOffset += offset
-        if (pageOffset > 0) {
-            if (!pageFactory.hasPrev()) {
-                pageOffset = 0f
-            } else {
-                pageFactory.moveToPrev()
-                textPage = pageFactory.currentPage
-                pageOffset -= textPage.height
-                upView?.invoke(textPage)
-            }
+        if (!pageFactory.hasPrev() && pageOffset > 0) {
+            pageOffset = 0f
+        } else if (!pageFactory.hasNext() && pageOffset < 0) {
+            pageOffset = 0f
+        } else if (pageOffset > 0) {
+            pageFactory.moveToPrev()
+            textPage = pageFactory.currentPage
+            pageOffset -= textPage.height
+            upView?.invoke(textPage)
         } else if (pageOffset < -textPage.height) {
-            if (!pageFactory.hasNext()) {
-                pageOffset = -textPage.height.toFloat()
-            } else {
-                pageOffset += textPage.height
-                pageFactory.moveToNext()
-                textPage = pageFactory.currentPage
-                upView?.invoke(textPage)
-            }
+            pageOffset += textPage.height
+            pageFactory.moveToNext()
+            textPage = pageFactory.currentPage
+            upView?.invoke(textPage)
         }
         invalidate()
     }