feat: 优化代码

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

@@ -23,10 +23,10 @@ import io.legado.app.utils.removePref
 object ChapterProvider {
     var viewWidth = 0
     var viewHeight = 0
-    private var visibleWidth = 0
-    private var visibleHeight = 0
-    private var paddingLeft = 0
-    private var paddingTop = 0
+    var visibleWidth = 0
+    var visibleHeight = 0
+    var paddingLeft = 0
+    var paddingTop = 0
     private var lineSpacingExtra = 0f
     private var paragraphSpacing = 0
     var typeface: Typeface = Typeface.SANS_SERIF

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

@@ -3,8 +3,6 @@ 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
@@ -30,7 +28,7 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     private var selectCharStart = 0
     private var selectLineEnd = 0
     private var selectCharEnd = 0
-    private var textPage: TextPage = TextPage()
+    private var textPage: TextPage = TextPage().textToLine()
     //滚动参数
     private val pageFactory: TextPageFactory get() = callBack.pageFactory
     private val maxScrollOffset = 100f
@@ -60,29 +58,13 @@ 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)
+        if (ReadBookConfig.isScroll) {
+            drawScrollPage(canvas)
         } 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) {
@@ -110,6 +92,10 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
         }
     }
 
+    private fun drawScrollPage(canvas: Canvas) {
+
+    }
+
     fun onScroll(mOffset: Float) {
         var offset = mOffset
         if (offset > maxScrollOffset) {

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

@@ -1,7 +1,10 @@
 package io.legado.app.ui.book.read.page.entities
 
+import android.text.Layout
+import android.text.StaticLayout
 import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.ui.book.read.page.ChapterProvider
 
 data class TextPage(
     var index: Int = 0,
@@ -14,6 +17,40 @@ data class TextPage(
     var height: Int = 0
 ) {
 
+    @Suppress("DEPRECATION")
+    fun textToLine(): TextPage {
+        if (textLines.isEmpty()) {
+            val layout = StaticLayout(
+                text, ChapterProvider.contentPaint, ChapterProvider.visibleWidth,
+                Layout.Alignment.ALIGN_NORMAL, 1f, 0f, false
+            )
+            var y = (ChapterProvider.visibleHeight - layout.height) / 2f
+            if (y < 0) y = 0f
+            for (lineIndex in 0 until layout.lineCount) {
+                val textLine = TextLine()
+                textLine.lineTop = (ChapterProvider.paddingTop + y -
+                        (layout.getLineBottom(lineIndex) - layout.getLineTop(lineIndex)))
+                textLine.lineBase = (ChapterProvider.paddingTop + y -
+                        (layout.getLineBottom(lineIndex) - layout.getLineBaseline(lineIndex)))
+                textLine.lineBottom =
+                    textLine.lineBase + ChapterProvider.contentPaint.fontMetrics.descent
+                var x = (ChapterProvider.visibleWidth - layout.getLineMax(lineIndex)) / 2
+                textLine.text =
+                    text.substring(layout.getLineStart(lineIndex), layout.getLineEnd(lineIndex))
+                for (i in textLine.text.indices) {
+                    val char = textLine.text[i].toString()
+                    val cw = StaticLayout.getDesiredWidth(char, ChapterProvider.contentPaint)
+                    val x1 = x + cw
+                    textLine.textChars.add(TextChar(charData = char, start = x, end = x1))
+                    x = x1
+                }
+                textLines.add(textLine)
+            }
+            height = ChapterProvider.visibleHeight
+        }
+        return this
+    }
+
     fun removePageAloudSpan(): TextPage {
         textLines.forEach { textLine ->
             textLine.isReadAloud = false