修复滚动bug

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

@@ -23,7 +23,9 @@ import io.legado.app.utils.getCompatColor
 import io.legado.app.utils.getPrefBoolean
 import kotlinx.coroutines.CoroutineScope
 
-
+/**
+ * 阅读内容界面
+ */
 class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, attrs) {
     var selectAble = context.getPrefBoolean(PreferKey.textSelectAble)
     var upView: ((TextPage) -> Unit)? = null
@@ -41,7 +43,6 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     //滚动参数
     private val pageFactory: TextPageFactory get() = callBack.pageFactory
-    private val maxScrollOffset = 100f
     private var pageOffset = 0f
 
     init {
@@ -173,17 +174,13 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
      */
     fun onScroll(mOffset: Float) {
         if (mOffset == 0f) return
-        var offset = mOffset
+        pageOffset += mOffset
-        if (offset > maxScrollOffset) {
-            offset = maxScrollOffset
-        } else if (offset < -maxScrollOffset) {
-            offset = -maxScrollOffset
-        }
-
-        pageOffset += offset
         if (!pageFactory.hasPrev() && pageOffset > 0) {
             pageOffset = 0f
-        } else if (!pageFactory.hasNext() && pageOffset < 0) {
+        } else if (!pageFactory.hasNext()
+            && pageOffset < 0
+            && pageOffset + textPage.height < ChapterProvider.visibleHeight
+        ) {
             pageOffset = 0f
         } else if (pageOffset > 0) {
             pageFactory.moveToPrev(false)
@@ -263,7 +260,10 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                     for ((charIndex, textChar) in textLine.textChars.withIndex()) {
                         if (x > textChar.start && x < textChar.end) {
                             if (selectStart[0] != relativePos || selectStart[1] != lineIndex || selectStart[2] != charIndex) {
-                                if (selectToInt(relativePos, lineIndex, charIndex) > selectToInt(selectEnd)) {
+                                if (selectToInt(relativePos, lineIndex, charIndex) > selectToInt(
+                                        selectEnd
+                                    )
+                                ) {
                                     return
                                 }
                                 selectStart[0] = relativePos
@@ -306,7 +306,10 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                         if (x > textChar.start && x < textChar.end) {
                             Log.e("char", "$relativePos  $lineIndex $charIndex")
                             if (selectEnd[0] != relativePos || selectEnd[1] != lineIndex || selectEnd[2] != charIndex) {
-                                if (selectToInt(relativePos, lineIndex, charIndex) < selectToInt(selectStart)) {
+                                if (selectToInt(relativePos, lineIndex, charIndex) < selectToInt(
+                                        selectStart
+                                    )
+                                ) {
                                     return
                                 }
                                 selectEnd[0] = relativePos