feat: 优化代码

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

@@ -4,7 +4,6 @@ import android.view.MotionEvent
 import io.legado.app.constant.PreferKey
 import io.legado.app.ui.book.read.page.PageView
 import io.legado.app.utils.getPrefBoolean
-import io.legado.app.utils.screenshot
 import kotlin.math.abs
 
 abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageView) {
@@ -27,8 +26,7 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
                         return true
                     }
                     setDirection(Direction.PREV)
-                    //上一页截图
+                    setBitmap()
-                    bitmap = prevPage.screenshot()
                 } else {
                     //如果不存在表示没有下一页了
                     if (!hasNext()) {
@@ -36,8 +34,7 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
                         return true
                     }
                     setDirection(Direction.NEXT)
-                    //下一页截图
+                    setBitmap()
-                    bitmap = nextPage.screenshot()
                 }
                 isMoved = true
             }

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

@@ -231,10 +231,19 @@ abstract class PageDelegate(protected val pageView: PageView) {
         NONE, PREV, NEXT
     }
 
+    @CallSuper
     open fun setDirection(direction: Direction) {
         mDirection = direction
     }
 
+    open fun setBitmap() {
+        bitmap = when (mDirection) {
+            Direction.NEXT -> nextPage.screenshot()
+            Direction.PREV -> prevPage.screenshot()
+            else -> null
+        }
+    }
+
     /**
      * 触摸事件处理
      */
@@ -264,7 +273,7 @@ abstract class PageDelegate(protected val pageView: PageView) {
                 pageView.callBack?.clickCenter()
                 setTouchPoint(x, y)
             } else {
-                bitmap = if (x > viewWidth / 2 ||
+                if (x > viewWidth / 2 ||
                     AppConfig.clickAllNext
                 ) {
                     //设置动画方向
@@ -272,15 +281,13 @@ abstract class PageDelegate(protected val pageView: PageView) {
                         return true
                     }
                     setDirection(Direction.PREV)
-                    //下一页截图
+                    setBitmap()
-                    nextPage.screenshot()
                 } else {
                     if (!hasPrev()) {
                         return true
                     }
                     setDirection(Direction.NEXT)
-                    //上一页截图
+                    setBitmap()
-                    prevPage.screenshot()
                 }
                 setTouchPoint(x, y)
                 onScrollStart()

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

@@ -7,7 +7,6 @@ import android.view.MotionEvent
 import io.legado.app.constant.PreferKey
 import io.legado.app.ui.book.read.page.PageView
 import io.legado.app.utils.getPrefBoolean
-import io.legado.app.utils.screenshot
 import kotlin.math.abs
 
 class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
@@ -89,8 +88,7 @@ class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
                         return true
                     }
                     setDirection(Direction.PREV)
-                    //上一页截图
+                    setBitmap()
-                    bitmap = prevPage.screenshot()
                 }
             } else {
                 if (atBottom) {
@@ -103,8 +101,7 @@ class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
                         return true
                     }
                     setDirection(Direction.NEXT)
-                    //下一页截图
+                    setBitmap()
-                    bitmap = nextPage.screenshot()
                 }
             }
             isMoved = true

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

@@ -4,6 +4,7 @@ import android.graphics.*
 import android.graphics.drawable.GradientDrawable
 import android.os.Build
 import io.legado.app.ui.book.read.page.PageView
+import io.legado.app.utils.screenshot
 import kotlin.math.*
 
 @Suppress("DEPRECATION")
@@ -87,7 +88,6 @@ class SimulationPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageVi
     override fun setTouchPoint(x: Float, y: Float, invalidate: Boolean) {
         super.setTouchPoint(x, y, invalidate)
         //触摸y中间位置吧y变成屏幕高度
-        //触摸y中间位置吧y变成屏幕高度
         if ((startY > pageView.height / 3.0
                     && startY < pageView.height * 2 / 3.0)
             || mDirection == Direction.PREV
@@ -123,6 +123,20 @@ class SimulationPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageVi
         }
     }
 
+    override fun setBitmap() {
+        when (mDirection) {
+            Direction.PREV -> {
+                prevBitmap = prevPage.screenshot()
+                curBitmap = curPage.screenshot()
+            }
+            Direction.NEXT -> {
+                nextBitmap = nextPage.screenshot()
+                curBitmap = curPage.screenshot()
+            }
+            else -> Unit
+        }
+    }
+
     override fun onScrollStart() {
         val distanceX: Float
         when (mDirection) {