feat: 优化代码

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

@@ -4,6 +4,7 @@ import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Paint
 import android.util.AttributeSet
+import android.util.Log
 import android.view.View
 import io.legado.app.R
 import io.legado.app.constant.PreferKey
@@ -80,10 +81,9 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     private fun drawScrollPage(canvas: Canvas) {
         textPage.textLines.forEach { textLine ->
-            val yPy = pageOffset
-            val lineTop = textLine.lineTop + yPy
-            val lineBase = textLine.lineBase + yPy
-            val lineBottom = textLine.lineBottom + yPy
+            val lineTop = textLine.lineTop + pageOffset
+            val lineBase = textLine.lineBase + pageOffset
+            val lineBottom = textLine.lineBottom + pageOffset
             drawChars(
                 canvas,
                 textLine.textChars,
@@ -148,7 +148,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     fun onScroll(mOffset: Float) {
         if (mOffset == 0f) return
-        var offset = -mOffset
+        var offset = mOffset
         if (offset > maxScrollOffset) {
             offset = maxScrollOffset
         } else if (offset < -maxScrollOffset) {
@@ -159,6 +159,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         if (pageOffset > 0) {
             pageFactory.moveToPrev()
             textPage = pageFactory.currentPage ?: TextPage().format()
+            Log.e("pageOffSet", pageOffset.toString() + "   " + textPage.height)
             pageOffset -= textPage.height
             callBack.upContent(0, false)
         } else if (pageOffset < -textPage.height) {

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

@@ -100,6 +100,7 @@ class ContentView(context: Context) : FrameLayout(context) {
                 content_text_view.resetPageOffset()
                 content_text_view.setContent(textPage)
             }
+            content_text_view.invalidate()
         }
     }
 

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

@@ -6,9 +6,9 @@ import android.graphics.Canvas
 import android.graphics.RectF
 import android.view.GestureDetector
 import android.view.MotionEvent
+import android.view.animation.DecelerateInterpolator
 import android.widget.Scroller
 import androidx.annotation.CallSuper
-import androidx.interpolator.view.animation.FastOutLinearInInterpolator
 import com.google.android.material.snackbar.Snackbar
 import io.legado.app.constant.PreferKey
 import io.legado.app.help.AppConfig
@@ -47,16 +47,13 @@ abstract class PageDelegate(protected val pageView: PageView) :
 
     protected var viewWidth: Int = pageView.width
     protected var viewHeight: Int = pageView.height
-    //textView在顶端或低端
-    protected var atTop: Boolean = false
-    protected var atBottom: Boolean = false
 
     private val snackBar: Snackbar by lazy {
         Snackbar.make(pageView, "", Snackbar.LENGTH_SHORT)
     }
 
     private val scroller: Scroller by lazy {
-        Scroller(pageView.context, FastOutLinearInInterpolator())
+        Scroller(pageView.context, DecelerateInterpolator())
     }
 
     private val detector: GestureDetector by lazy {
@@ -83,7 +80,7 @@ abstract class PageDelegate(protected val pageView: PageView) :
         touchY = y
 
         if (invalidate) {
-            invalidate()
+            pageView.invalidate()
         }
     }
 
@@ -93,7 +90,7 @@ abstract class PageDelegate(protected val pageView: PageView) :
         touchY = y
 
         if (invalidate) {
-            invalidate()
+            pageView.postInvalidate()
         }
 
         onScroll()
@@ -103,10 +100,6 @@ abstract class PageDelegate(protected val pageView: PageView) :
         detector.setIsLongpressEnabled(selectAble)
     }
 
-    protected fun invalidate() {
-        pageView.invalidate()
-    }
-
     open fun fling(
         startX: Int, startY: Int, velocityX: Int, velocityY: Int,
         minX: Int, maxX: Int, minY: Int, maxY: Int
@@ -114,7 +107,7 @@ abstract class PageDelegate(protected val pageView: PageView) :
         scroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY)
         isRunning = true
         isStarted = true
-        invalidate()
+        pageView.invalidate()
     }
 
     protected fun startScroll(startX: Int, startY: Int, dx: Int, dy: Int) {
@@ -127,13 +120,13 @@ abstract class PageDelegate(protected val pageView: PageView) :
         )
         isRunning = true
         isStarted = true
-        invalidate()
+        pageView.invalidate()
     }
 
     private fun stopScroll() {
         isRunning = false
         isStarted = false
-        invalidate()
+        pageView.invalidate()
         bitmap?.recycle()
         bitmap = null
     }
@@ -141,7 +134,7 @@ abstract class PageDelegate(protected val pageView: PageView) :
     fun setViewSize(width: Int, height: Int) {
         viewWidth = width
         viewHeight = height
-        invalidate()
+        pageView.invalidate()
         centerRectF.set(
             width * 0.33f, height * 0.33f,
             width * 0.66f, height * 0.66f

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

@@ -22,7 +22,7 @@ class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
     }
 
     override fun onDraw(canvas: Canvas) {
-        curPage.onScroll(lastY - touchY)
+        curPage.onScroll(touchY - lastY)
     }
 
     override fun onAnimStop() {
@@ -52,23 +52,19 @@ class ScrollPageDelegate(pageView: PageView) : PageDelegate(pageView) {
 
         if (!isMoved && abs(distanceX) < abs(distanceY)) {
             if (distanceY < 0) {
-                if (atTop) {
                 //如果上一页不存在
                 if (!hasPrev()) {
                     noNext = true
                     return true
                 }
                 setDirection(Direction.PREV)
-                }
             } else {
-                if (atBottom) {
-                    //如果不存在表示没有下一页了
+                //如果上一页不存在
                 if (!hasNext()) {
                     noNext = true
                     return true
                 }
-                    setDirection(Direction.NEXT)
-                }
+                setDirection(Direction.PREV)
             }
             isMoved = true
         }