feat: 优化代码

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

@@ -35,47 +35,9 @@ object ChapterProvider {
         upStyle(ReadBookConfig.durConfig)
     }
 
-    fun upStyle(config: ReadBookConfig.Config) {
-        typeface = try {
-            val fontPath = App.INSTANCE.getPrefString(PreferKey.readBookFont)
-            if (!TextUtils.isEmpty(fontPath)) {
-                Typeface.createFromFile(fontPath)
-            } else {
-                Typeface.SANS_SERIF
-            }
-        } catch (e: Exception) {
-            App.INSTANCE.removePref(PreferKey.readBookFont)
-            Typeface.SANS_SERIF
-        }
-        //标题
-        titlePaint.isAntiAlias = true
-        titlePaint.color = config.textColor()
-        titlePaint.letterSpacing = config.letterSpacing
-        titlePaint.typeface = Typeface.create(typeface, Typeface.BOLD)
-        //正文
-        contentPaint.isAntiAlias = true
-        contentPaint.color = config.textColor()
-        contentPaint.letterSpacing = config.letterSpacing
-        val bold = if (config.textBold) Typeface.BOLD else Typeface.NORMAL
-        contentPaint.typeface = Typeface.create(typeface, bold)
-        //间距
-        lineSpacingExtra = config.lineSpacingExtra.dp.toFloat()
-        paragraphSpacing = config.paragraphSpacing.dp
-        titlePaint.textSize = (config.textSize + 2).dp.toFloat()
-        contentPaint.textSize = config.textSize.dp.toFloat()
-
-        bodyIndent = BookHelp.bodyIndent
-
-        upSize(config)
-    }
-
-    fun upSize(config: ReadBookConfig.Config) {
-        paddingLeft = config.paddingLeft.dp
-        paddingTop = config.paddingTop.dp
-        visibleWidth = viewWidth - paddingLeft - config.paddingRight.dp
-        visibleHeight = viewHeight - paddingTop - config.paddingBottom.dp
-    }
-
+    /**
+     * 获取拆分完的章节数据
+     */
     fun getTextChapter(
         bookChapter: BookChapter,
         content: String,
@@ -328,4 +290,53 @@ object ChapterProvider {
         durY += paragraphSpacing
         return durY
     }
+
+
+    /**
+     * 更新样式
+     */
+    fun upStyle(config: ReadBookConfig.Config) {
+        typeface = try {
+            val fontPath = App.INSTANCE.getPrefString(PreferKey.readBookFont)
+            if (!TextUtils.isEmpty(fontPath)) {
+                Typeface.createFromFile(fontPath)
+            } else {
+                Typeface.SANS_SERIF
+            }
+        } catch (e: Exception) {
+            App.INSTANCE.removePref(PreferKey.readBookFont)
+            Typeface.SANS_SERIF
+        }
+        //标题
+        titlePaint.isAntiAlias = true
+        titlePaint.color = config.textColor()
+        titlePaint.letterSpacing = config.letterSpacing
+        titlePaint.typeface = Typeface.create(typeface, Typeface.BOLD)
+        //正文
+        contentPaint.isAntiAlias = true
+        contentPaint.color = config.textColor()
+        contentPaint.letterSpacing = config.letterSpacing
+        val bold = if (config.textBold) Typeface.BOLD else Typeface.NORMAL
+        contentPaint.typeface = Typeface.create(typeface, bold)
+        //间距
+        lineSpacingExtra = config.lineSpacingExtra.dp.toFloat()
+        paragraphSpacing = config.paragraphSpacing.dp
+        titlePaint.textSize = (config.textSize + 2).dp.toFloat()
+        contentPaint.textSize = config.textSize.dp.toFloat()
+
+        bodyIndent = BookHelp.bodyIndent
+
+        upSize(config)
+    }
+
+    /**
+     * 更新View尺寸
+     */
+    fun upSize(config: ReadBookConfig.Config) {
+        paddingLeft = config.paddingLeft.dp
+        paddingTop = config.paddingTop.dp
+        visibleWidth = viewWidth - paddingLeft - config.paddingRight.dp
+        visibleHeight = viewHeight - paddingTop - config.paddingBottom.dp
+    }
+
 }

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

@@ -3,6 +3,8 @@ package io.legado.app.ui.book.read.page
 import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Paint
+import android.text.Layout
+import android.text.StaticLayout
 import android.util.AttributeSet
 import android.view.View
 import io.legado.app.R
@@ -37,10 +39,12 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     init {
         activityCallBack = activity as CallBack
+        contentDescription = textPage.text
     }
 
     fun setContent(textPage: TextPage) {
         this.textPage = textPage
+        contentDescription = textPage.text
         invalidate()
     }
 
@@ -55,6 +59,29 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
 
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
+        if (textPage.textLines.isEmpty()) {
+            drawMsg(canvas, textPage.text)
+        } else {
+            drawHorizontalPage(canvas)
+        }
+    }
+
+    @Suppress("DEPRECATION")
+    private fun drawMsg(canvas: Canvas, msg: String) {
+        val layout = StaticLayout(
+            msg, ChapterProvider.contentPaint, width,
+            Layout.Alignment.ALIGN_NORMAL, 1f, 0f, false
+        )
+        val y = (height - layout.height) / 2f
+        for (lineIndex in 0 until layout.lineCount) {
+            val x = (width - layout.getLineMax(lineIndex)) / 2
+            val words =
+                msg.substring(layout.getLineStart(lineIndex), layout.getLineEnd(lineIndex))
+            canvas.drawText(words, x, y, ChapterProvider.contentPaint)
+        }
+    }
+
+    private fun drawHorizontalPage(canvas: Canvas) {
         textPage.textLines.forEach { textLine ->
             val textPaint = if (textLine.isTitle) {
                 ChapterProvider.titlePaint