feat: 优化代码

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

@@ -26,12 +26,12 @@ class PageView(context: Context, attrs: AttributeSet) :
 
     init {
         callBack = activity as CallBack
-        prevPage = ContentView(context)
-        addView(prevPage)
         nextPage = ContentView(context)
         addView(nextPage)
         curPage = ContentView(context)
         addView(curPage)
+        prevPage = ContentView(context)
+        addView(prevPage)
         upBg()
         setWillNotDraw(false)
         pageFactory = TextPageFactory(this)
@@ -40,6 +40,7 @@ class PageView(context: Context, attrs: AttributeSet) :
 
     override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
         super.onSizeChanged(w, h, oldw, oldh)
+        prevPage.x = -w.toFloat()
         pageDelegate?.setViewSize(w, h)
         if (oldw != 0 && oldh != 0) {
             ReadBook.loadContent()

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

@@ -1,14 +1,12 @@
 package io.legado.app.ui.book.read.page.delegate
 
 import android.graphics.Canvas
-import android.graphics.Matrix
 import android.graphics.drawable.GradientDrawable
 import io.legado.app.ui.book.read.page.PageView
 
 class CoverPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
 
     private val shadowDrawableR: GradientDrawable
-    private val bitmapMatrix = Matrix()
 
     init {
         val shadowColors = intArrayOf(0x66111111, 0x00000000)
@@ -38,17 +36,9 @@ class CoverPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
                     viewWidth - (touchX - startX)
                 }
         }
-
         startScroll(touchX.toInt(), 0, distanceX.toInt(), 0)
     }
 
-    override fun onAnimStop() {
-        curPage.x = 0.toFloat()
-        if (!isCancel) {
-            pageView.fillPage(mDirection)
-        }
-    }
-
     override fun onDraw(canvas: Canvas) {
         val offsetX = touchX - startX
 
@@ -57,15 +47,13 @@ class CoverPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
         ) return
 
         val distanceX = if (offsetX > 0) offsetX - viewWidth else offsetX + viewWidth
-        bitmap?.let {
+        if (!isMoved) return
-            if (mDirection == Direction.PREV) {
+        if (mDirection == Direction.PREV) {
-                bitmapMatrix.setTranslate(distanceX, 0.toFloat())
+            prevPage.translationX = offsetX - viewWidth
-                canvas.drawBitmap(it, bitmapMatrix, null)
+        } else if (mDirection == Direction.NEXT) {
-            } else if (mDirection == Direction.NEXT) {
+            curPage.translationX = offsetX
-                curPage.translationX = offsetX
-            }
-            addShadow(distanceX.toInt(), canvas)
         }
+        addShadow(distanceX.toInt(), canvas)
     }
 
     private fun addShadow(left: Int, canvas: Canvas) {
@@ -77,4 +65,13 @@ class CoverPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
             shadowDrawableR.draw(canvas)
         }
     }
+
+    override fun onAnimStop() {
+        curPage.x = 0.toFloat()
+        prevPage.x = -viewWidth.toFloat()
+        if (!isCancel) {
+            pageView.fillPage(mDirection)
+        }
+    }
+
 }

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

@@ -8,6 +8,9 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
 
     override fun onTouch(event: MotionEvent) {
         when (event.action) {
+            MotionEvent.ACTION_DOWN -> {
+                abort()
+            }
             MotionEvent.ACTION_MOVE -> {
                 if (isTextSelected) {
                     selectText(event)
@@ -32,7 +35,6 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
                         return
                     }
                     setDirection(Direction.PREV)
-                    setBitmap()
                 } else {
                     //如果不存在表示没有下一页了
                     if (!hasNext()) {
@@ -40,7 +42,6 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
                         return
                     }
                     setDirection(Direction.NEXT)
-                    setBitmap()
                 }
             }
         }
@@ -55,7 +56,6 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
     override fun nextPageByAnim() {
         if (!hasNext()) return
         setDirection(Direction.NEXT)
-        setBitmap()
         setTouchPoint(viewWidth.toFloat(), 0f)
         onAnimStart()
     }
@@ -63,8 +63,8 @@ abstract class HorizontalPageDelegate(pageView: PageView) : PageDelegate(pageVie
     override fun prevPageByAnim() {
         if (!hasPrev()) return
         setDirection(Direction.PREV)
-        setBitmap()
         setTouchPoint(0f, 0f)
         onAnimStart()
     }
+
 }

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

@@ -1,7 +1,6 @@
 package io.legado.app.ui.book.read.page.delegate
 
 import android.content.Context
-import android.graphics.Bitmap
 import android.graphics.Canvas
 import android.graphics.RectF
 import android.view.GestureDetector
@@ -15,7 +14,6 @@ import io.legado.app.help.AppConfig
 import io.legado.app.help.ReadBookConfig
 import io.legado.app.ui.book.read.page.ContentView
 import io.legado.app.ui.book.read.page.PageView
-import io.legado.app.utils.screenshot
 import kotlin.math.abs
 
 abstract class PageDelegate(protected val pageView: PageView) :
@@ -40,8 +38,6 @@ abstract class PageDelegate(protected val pageView: PageView) :
     protected val curPage: ContentView get() = pageView.curPage
     protected val prevPage: ContentView get() = pageView.prevPage
 
-    protected var bitmap: Bitmap? = null
-
     protected var viewWidth: Int = pageView.width
     protected var viewHeight: Int = pageView.height
 
@@ -126,11 +122,10 @@ abstract class PageDelegate(protected val pageView: PageView) :
     }
 
     private fun stopScroll() {
+        isMoved = false
         isRunning = false
         isStarted = false
         pageView.invalidate()
-        bitmap?.recycle()
-        bitmap = null
     }
 
     open fun setViewSize(width: Int, height: Int) {
@@ -175,14 +170,6 @@ abstract class PageDelegate(protected val pageView: PageView) :
         mDirection = direction
     }
 
-    open fun setBitmap() {
-        bitmap = when (mDirection) {
-            Direction.NEXT -> nextPage.screenshot()
-            Direction.PREV -> prevPage.screenshot()
-            else -> null
-        }
-    }
-
     /**
      * 触摸事件处理
      */
@@ -321,7 +308,7 @@ abstract class PageDelegate(protected val pageView: PageView) :
     }
 
     open fun onDestroy() {
-        bitmap?.recycle()
+
     }
 
     enum class Direction {

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

@@ -142,6 +142,7 @@ class SimulationPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageVi
 
     override fun setDirection(direction: Direction) {
         super.setDirection(direction)
+        setBitmap()
         when (direction) {
             Direction.PREV ->
                 //上一页滑动不出现对角
@@ -158,7 +159,7 @@ class SimulationPageDelegate(pageView: PageView) : HorizontalPageDelegate(pageVi
         }
     }
 
-    override fun setBitmap() {
+    fun setBitmap() {
         when (mDirection) {
             Direction.PREV -> {
                 prevBitmap = prevPage.screenshot()

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

@@ -1,13 +1,10 @@
 package io.legado.app.ui.book.read.page.delegate
 
 import android.graphics.Canvas
-import android.graphics.Matrix
 import io.legado.app.ui.book.read.page.PageView
 
 class SlidePageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
 
-    private val bitmapMatrix = Matrix()
-
     override fun onAnimStart() {
         val distanceX: Float
         when (mDirection) {
@@ -28,7 +25,6 @@ class SlidePageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
                     viewWidth - (touchX - startX)
                 }
         }
-
         startScroll(touchX.toInt(), 0, distanceX.toInt(), 0)
     }
 
@@ -39,26 +35,19 @@ class SlidePageDelegate(pageView: PageView) : HorizontalPageDelegate(pageView) {
             || (mDirection == Direction.PREV && offsetX < 0)
         ) return
 
-        val distanceX = if (offsetX > 0) offsetX - viewWidth else offsetX + viewWidth
+        if (!isMoved) return
-        bitmap?.let {
+        if (mDirection == Direction.PREV) {
-            bitmapMatrix.setTranslate(distanceX, 0.toFloat())
+            prevPage.translationX = offsetX - viewWidth
-            canvas.drawBitmap(it, bitmapMatrix, null)
+            curPage.translationX = offsetX
+        } else if (mDirection == Direction.NEXT) {
+            curPage.translationX = offsetX
+            nextPage.translationX = curPage.x + viewWidth
         }
     }
 
-    override fun onScroll() {
-        val offsetX = touchX - startX
-
-        if ((mDirection == Direction.NEXT && offsetX > 0)
-            || (mDirection == Direction.PREV && offsetX < 0)
-        ) return
-
-        curPage.translationX = offsetX
-    }
-
     override fun onAnimStop() {
         curPage.x = 0.toFloat()
-
+        prevPage.x = -viewWidth.toFloat()
         if (!isCancel) {
             pageView.fillPage(mDirection)
         }