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

@@ -129,11 +129,12 @@ object ChapterProvider {
                 matcher.appendTail(sb)
                 text = sb.toString()
                 val isTitle = index == 0
+                val isVolumeTitle = bookChapter.isVolume && isTitle && bookChapter.url == bookChapter.title
                 val textPaint = if (isTitle) titlePaint else contentPaint
                 if (!(isTitle && ReadBookConfig.titleMode == 2)) {
                     setTypeText(
                         absStartX, durY, text, textPages, stringBuilder,
-                        isTitle, textPaint, srcList
+                        isTitle, isVolumeTitle, textPaint, srcList
                     ).let {
                         absStartX = it.first
                         durY = it.second
@@ -146,11 +147,12 @@ object ChapterProvider {
                     val text = content.substring(start, matcher.start())
                     if (text.isNotBlank()) {
                         val isTitle = index == 0
+                        val isVolumeTitle = bookChapter.isVolume && isTitle && bookChapter.url == bookChapter.title
                         val textPaint = if (isTitle) titlePaint else contentPaint
                         if (!(isTitle && ReadBookConfig.titleMode == 2)) {
                             setTypeText(
                                 absStartX, durY, text, textPages,
-                                stringBuilder, isTitle, textPaint
+                                stringBuilder, isTitle, isVolumeTitle, textPaint
                             ).let {
                                 absStartX = it.first
                                 durY = it.second
@@ -167,11 +169,12 @@ object ChapterProvider {
                     val text = content.substring(start, content.length)
                     if (text.isNotBlank()) {
                         val isTitle = index == 0
+                        val isVolumeTitle = bookChapter.isVolume && isTitle && bookChapter.url == bookChapter.title
                         val textPaint = if (isTitle) titlePaint else contentPaint
                         if (!(isTitle && ReadBookConfig.titleMode == 2)) {
                             setTypeText(
                                 absStartX, durY, text, textPages,
-                                stringBuilder, isTitle, textPaint
+                                stringBuilder, isTitle, isVolumeTitle, textPaint
                             ).let {
                                 absStartX = it.first
                                 durY = it.second
@@ -274,16 +277,21 @@ object ChapterProvider {
         textPages: ArrayList<TextPage>,
         stringBuilder: StringBuilder,
         isTitle: Boolean,
+        isVolumeTitle: Boolean,
         textPaint: TextPaint,
         srcList: LinkedList<String>? = null
     ): Pair<Int, Float> {
         var absStartX = x
-        var durY = if (isTitle) y + titleTopSpacing else y
         val layout = if (ReadBookConfig.useZhLayout) {
             ZhLayout(text, textPaint, visibleWidth)
         } else StaticLayout(
             text, textPaint, visibleWidth, Layout.Alignment.ALIGN_NORMAL, 0f, 0f, true
         )
+        var durY = when {
+            isVolumeTitle -> ((visibleHeight - layout.lineCount * textPaint.textHeight) / 2).toFloat()
+            isTitle -> y + titleTopSpacing
+            else -> y
+        }
         for (lineIndex in 0 until layout.lineCount) {
             val textLine = TextLine(isTitle = isTitle)
             if (durY + textPaint.textHeight > visibleHeight) {
@@ -309,8 +317,9 @@ object ChapterProvider {
                 text.substring(layout.getLineStart(lineIndex), layout.getLineEnd(lineIndex))
             val desiredWidth = layout.getLineWidth(lineIndex)
             var isLastLine = false
-            if (lineIndex == 0 && layout.lineCount > 1 && !isTitle) {
-                //第一行
+            when {
+                lineIndex == 0 && layout.lineCount > 1 && !isTitle -> {
+                    //第一行 非标题
                     textLine.text = words
                     addCharsToLineFirst(
                         absStartX,
@@ -320,11 +329,13 @@ object ChapterProvider {
                         desiredWidth,
                         srcList
                     )
-            } else if (lineIndex == layout.lineCount - 1) {
+                }
+                lineIndex == layout.lineCount - 1 -> {
                     //最后一行
                     textLine.text = "$words\n"
                     isLastLine = true
-                val startX = if (isTitle && ReadBookConfig.titleMode == 1)
+                    //标题居中
+                    val startX = if (isTitle && ReadBookConfig.titleMode == 1 || isVolumeTitle)
                         (visibleWidth - layout.getLineWidth(lineIndex)) / 2
                     else 0f
                     addCharsToLineLast(
@@ -335,7 +346,8 @@ object ChapterProvider {
                         startX,
                         srcList
                     )
-            } else {
+                }
+                else -> {
                     //中间行
                     textLine.text = words
                     addCharsToLineMiddle(
@@ -348,6 +360,7 @@ object ChapterProvider {
                         srcList
                     )
                 }
+            }
             stringBuilder.append(words)
             if (isLastLine) stringBuilder.append("\n")
             textPages.last().textLines.add(textLine)
@@ -355,7 +368,7 @@ object ChapterProvider {
             durY += textPaint.textHeight * lineSpacingExtra
             textPages.last().height = durY
         }
-        if (isTitle) durY += titleBottomSpacing
+        if (isTitle && !isVolumeTitle) durY += titleBottomSpacing
         durY += textPaint.textHeight * paragraphSpacing / 10f
         return Pair(absStartX, durY)
     }