gedoor
4 years ago
parent
76e28828e6
commit
256e2bb59d
@ -0,0 +1,357 @@ |
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package io.legado.app.ui.book.read.page.provider |
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import android.graphics.Rect |
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import android.text.Layout |
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import android.text.StaticLayout |
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import android.text.TextPaint |
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import io.legado.app.utils.toStringArray |
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import kotlin.math.max |
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/* |
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* 针对中文的断行排版处理-by hoodie13 |
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* 因为StaticLayout对标点处理不符合国人习惯，继承Layout |
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* 接口封的不抽象，数组用的也琐碎，因目前语法不熟悉，后面完善。 |
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* */ |
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@Suppress("MemberVisibilityCanBePrivate", "unused") |
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class ZhLayout( |
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text: String, |
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textPaint: TextPaint, |
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width: Int |
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) : Layout(text, textPaint, width, Alignment.ALIGN_NORMAL, 0f, 0f) { |
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var lineStart = IntArray(1000) |
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var lineEnd = IntArray(1000) |
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var lineWidth = FloatArray(1000) |
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var lineCompressMod = IntArray(1000) |
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private var lineCount = 0 |
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private val curPaint = textPaint |
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private val cnCharWitch = getDesiredWidth("我", textPaint) |
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enum class BreakMod { NORMAL, BREAK_ONE_CHAR, BREAK_MORE_CHAR, CPS_1, CPS_2, CPS_3, } |
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class Locate { |
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var start: Float = 0f |
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var end: Float = 0f |
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} |
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class Interval { |
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var total: Float = 0f |
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var single: Float = 0f |
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} |
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init { |
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var line = 0 |
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val words = text.toStringArray() |
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var lineW = 0f |
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var cwPre = 0f |
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words.forEachIndexed { index, s -> |
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val cw = getDesiredWidth(s, curPaint) |
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var breakMod: BreakMod |
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var breakLine = false |
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lineW += cw |
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var offset = 0f |
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var breakCharCnt = 0 |
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if (lineW > width) { |
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/*禁止在行尾的标点处理*/ |
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breakMod = if (index >= 1 && isPrePanc(words[index - 1])) { |
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if (index >= 2 && isPrePanc(words[index - 2])) BreakMod.CPS_2//如果后面还有一个禁首标点则异常 |
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else BreakMod.BREAK_ONE_CHAR //无异常场景 |
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} |
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/*禁止在行首的标点处理*/ |
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else if (isPostPanc(words[index])) { |
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if (index >= 1 && isPostPanc(words[index - 1])) BreakMod.CPS_1//如果后面还有一个禁首标点则异常，不过三个连续行尾标点的用法不通用 |
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else if (index >= 2 && isPrePanc(words[index - 2])) BreakMod.CPS_3//如果后面还有一个禁首标点则异常 |
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else BreakMod.BREAK_ONE_CHAR //无异常场景 |
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} else { |
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BreakMod.NORMAL //无异常场景 |
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} |
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/*判断上述逻辑解决不了的特殊情况*/ |
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var reCheck = false |
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var breakIndex = 0 |
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if (breakMod == BreakMod.CPS_1 && |
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(inCompressible(words[index]) || inCompressible(words[index - 1])) |
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) reCheck = true |
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if (breakMod == BreakMod.CPS_2 && |
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(inCompressible(words[index - 1]) || inCompressible(words[index - 2])) |
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) reCheck = true |
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if (breakMod == BreakMod.CPS_3 && |
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(inCompressible(words[index]) || inCompressible(words[index - 2])) |
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) reCheck = true |
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if (breakMod > BreakMod.BREAK_MORE_CHAR |
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&& index < words.lastIndex && isPostPanc(words[index + 1]) |
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) reCheck = true |
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/*特殊标点使用难保证显示效果，所以不考虑间隔，直接查找到能满足条件的分割字*/ |
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if (reCheck && index > 2) { |
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breakMod = BreakMod.NORMAL |
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for (i in (index) downTo 1) { |
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if (i == index) { |
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breakIndex = 0 |
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cwPre = 0f |
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} else { |
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breakIndex++ |
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cwPre += StaticLayout.getDesiredWidth(words[i], textPaint) |
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} |
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if (!isPostPanc(words[i]) && !isPrePanc(words[i - 1])) { |
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breakMod = BreakMod.BREAK_MORE_CHAR |
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break |
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} |
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} |
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} |
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when (breakMod) { |
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BreakMod.NORMAL -> {//模式0 正常断行 |
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offset = cw |
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lineEnd[line] = index |
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lineCompressMod[line] = 0 |
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breakCharCnt = 1 |
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} |
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BreakMod.BREAK_ONE_CHAR -> {//模式1 当前行下移一个字 |
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offset = cw + cwPre |
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lineEnd[line] = index - 1 |
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lineCompressMod[line] = 0 |
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breakCharCnt = 2 |
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} |
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BreakMod.BREAK_MORE_CHAR -> {//模式2 当前行下移多个字 |
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offset = cw + cwPre |
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lineEnd[line] = index - breakIndex |
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lineCompressMod[line] = 0 |
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breakCharCnt = breakIndex + 1 |
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} |
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BreakMod.CPS_1 -> {//模式3 两个后置标点压缩 |
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offset = 0f |
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lineEnd[line] = index + 1 |
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lineCompressMod[line] = 1 |
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breakCharCnt = 0 |
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} |
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BreakMod.CPS_2 -> { //模式4 前置标点压缩+前置标点压缩+字 |
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offset = 0f |
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lineEnd[line] = index + 1 |
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lineCompressMod[line] = 2 |
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breakCharCnt = 0 |
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} |
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BreakMod.CPS_3 -> {//模式5 前置标点压缩+字+后置标点压缩 |
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offset = 0f |
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lineEnd[line] = index + 1 |
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lineCompressMod[line] = 3 |
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breakCharCnt = 0 |
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} |
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} |
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breakLine = true |
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} |
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/*当前行写满情况下的断行*/ |
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if (breakLine) { |
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lineWidth[line] = lineW - offset |
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lineStart[line + 1] = lineEnd[line] |
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lineW = offset |
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line++ |
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} |
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/*已到最后一个字符*/ |
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if ((words.lastIndex) == index) { |
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if (!breakLine) { |
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offset = 0f |
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lineEnd[line] = index + 1 |
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lineWidth[line] = lineW - offset |
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lineW = offset |
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line++ |
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} |
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/*写满断行、段落末尾、且需要下移字符，这种特殊情况下要额外多一行*/ |
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else if (breakCharCnt > 0) { |
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lineEnd[line] = lineStart[line] + breakCharCnt |
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lineWidth[line] = lineW |
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line++ |
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} |
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} |
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cwPre = cw |
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if (line >= 999) { |
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return@forEachIndexed |
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} |
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} |
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lineCount = line |
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} |
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private fun isPostPanc(string: String): Boolean { |
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val panc = arrayOf( |
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"，", "。", "：", "？", "！", "、", "”", "’", "）", "》", "}", |
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"】", ")", ">", "]", "}", ",", ".", "?", "!", ":", "」", "；", ";" |
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) |
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panc.forEach { |
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if (it == string) return true |
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} |
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return false |
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} |
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private fun isPrePanc(string: String): Boolean { |
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val panc = arrayOf("“", "（", "《", "【", "‘", "‘", "(", "<", "[", "{", "「") |
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panc.forEach { |
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if (it == string) return true |
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} |
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return false |
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} |
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private fun inCompressible(string: String): Boolean { |
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return getDesiredWidth(string, curPaint) < cnCharWitch |
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} |
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private val gap = (cnCharWitch / 12.75).toFloat() |
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private fun getPostPancOffset(string: String): Float { |
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val textRect = Rect() |
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curPaint.getTextBounds(string, 0, 1, textRect) |
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return max(textRect.left.toFloat() - gap, 0f) |
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} |
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private fun getPrePancOffset(string: String): Float { |
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val textRect = Rect() |
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curPaint.getTextBounds(string, 0, 1, textRect) |
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val d = max(cnCharWitch - textRect.right.toFloat() - gap, 0f) |
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return cnCharWitch / 2 - d |
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} |
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fun getDesiredWidth(sting: String, paint: TextPaint) = paint.measureText(sting) |
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override fun getLineCount(): Int { |
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return lineCount |
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} |
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override fun getLineTop(line: Int): Int { |
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return 0 |
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} |
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override fun getLineDescent(line: Int): Int { |
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return 0 |
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} |
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override fun getLineStart(line: Int): Int = lineStart[line] |
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override fun getParagraphDirection(line: Int): Int { |
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return 0 |
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} |
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override fun getLineContainsTab(line: Int): Boolean { |
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return true |
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} |
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override fun getLineDirections(line: Int): Directions? { |
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return null |
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} |
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override fun getTopPadding(): Int { |
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return 0 |
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} |
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override fun getBottomPadding(): Int { |
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return 0 |
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} |
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override fun getLineWidth(line: Int): Float = lineWidth[line] |
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override fun getEllipsisStart(line: Int): Int { |
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return 0 |
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} |
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override fun getEllipsisCount(line: Int): Int { |
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return 0 |
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} |
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fun getDefaultWidth(): Float = cnCharWitch |
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/* |
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* @fun：获取当前行的平均间隔：用于两端对齐，获取左对齐时的右边间隔：用于间隔过大时不再两端对齐 |
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* @in：行，当前字符串，最大显示宽度 |
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* @out：单个字符的平均间隔，左对齐的最大间隔 |
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*/ |
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fun getInterval(line: Int, words: Array<String>, visibleWidth: Int): Interval { |
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val interval = Interval() |
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val total: Float |
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val d: Float |
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val lastIndex = words.lastIndex |
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val desiredWidth = getLineWidth(line) |
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if (lineCompressMod[line] > 0) { |
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val gapCount: Int = lastIndex - 1 |
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val lastWordsWith = getDesiredWidth(words[lastIndex], curPaint) |
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total = visibleWidth - desiredWidth + lastWordsWith |
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d = total / gapCount |
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} else { |
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val gapCount: Int = lastIndex |
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total = visibleWidth - desiredWidth |
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d = total / gapCount |
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} |
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interval.total = total |
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interval.single = d |
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return interval |
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} |
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/* |
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* @fun：获取当前行不同字符的位置 |
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* @in：行，当前字符对于最后一个字符的偏移值，字符，间隔，定位参数 |
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* @out：定位参数 |
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*/ |
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fun getLocate(line: Int, idx: Int, string: String, interval: Float, locate: Locate) { |
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val cw = getDesiredWidth(string, curPaint) |
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when (lineCompressMod[line]) { |
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1 -> { |
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when (idx) { |
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1 -> { |
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val offset = getPostPancOffset(string) |
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locate.start -= offset |
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locate.end = locate.start + cw / 2 + offset |
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} |
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0 -> { |
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locate.start -= getPostPancOffset(string) |
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locate.end = locate.start + cw |
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} |
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else -> { |
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locate.end = locate.start + cw + interval |
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} |
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} |
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} |
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2 -> { |
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when (idx) { |
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2 -> { |
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val offset = getPostPancOffset(string) |
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locate.start -= offset |
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locate.end = locate.start + cw / 2 + offset |
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} |
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1 -> { |
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val offset = getPostPancOffset(string) |
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locate.start -= offset |
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locate.end = locate.start + cw / 2 + offset |
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} |
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0 -> { |
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locate.end = locate.start + cw |
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} |
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else -> { |
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locate.end = locate.start + cw + interval |
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} |
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} |
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} |
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3 -> { |
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when (idx) { |
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2 -> { |
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val offset = getPrePancOffset(string) |
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locate.start -= offset |
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locate.end = locate.start + cw / 2 + offset |
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} |
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1 -> { |
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locate.end = locate.start + cw + interval |
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} |
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0 -> { |
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locate.start -= getPostPancOffset(string) |
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locate.end = locate.start + cw |
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} |
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else -> { |
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locate.end = locate.start + cw + interval |
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} |
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} |
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} |
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else -> { |
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locate.end = if (idx != 0) (locate.start + cw + interval) else (locate.start + cw) |
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} |
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} |
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} |
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} |
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