feat: 优化代码

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

@@ -458,7 +458,7 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_boo
      */
     override fun upContent(relativePosition: Int, resetScrollOffset: Boolean) {
         launch {
-            page_view.upContent(relativePosition)
+            page_view.upContent(relativePosition, resetScrollOffset)
         }
     }
 

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

@@ -180,11 +180,11 @@ abstract class PageDelegate(protected val pageView: PageView) :
         onAnimStart()
     }
 
-    abstract fun onAnimStart()//scroller start
+    open fun onAnimStart() {}//scroller start
 
     open fun onDraw(canvas: Canvas) {}//绘制
 
-    abstract fun onAnimStop()//scroller finish
+    open fun onAnimStop() {}//scroller finish
 
     open fun onScroll() {}//移动contentView， slidePage
 

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

@@ -24,12 +24,6 @@ class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
         curPage.onScroll(touchY - lastY)
     }
 
-    override fun onAnimStop() {
-        if (!isCancel) {
-            pageView.fillPage(mDirection)
-        }
-    }
-
     override fun onTouch(event: MotionEvent): Boolean {
         if (event.action == MotionEvent.ACTION_DOWN) {
             setStartPoint(event.x, event.y)