forked from github/szkolny
[UI/Messages] Improve HTML lists presentation.
This commit is contained in:
Kuba Szczodrzyński
parent
60641742ed
commit
507657f273
@ -1,17 +1,21 @@
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package pl.szczodrzynski.edziennik.ui.modules.messages
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import android.content.Context
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import android.graphics.*
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import android.os.Build
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import android.text.Html
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import android.graphics.Bitmap
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.RectF
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import android.text.Spanned
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import androidx.core.graphics.ColorUtils
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import pl.szczodrzynski.edziennik.*
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import pl.szczodrzynski.edziennik.App
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import pl.szczodrzynski.edziennik.R
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import pl.szczodrzynski.edziennik.data.db.entity.Message
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import pl.szczodrzynski.edziennik.data.db.full.MessageFull
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import pl.szczodrzynski.edziennik.fixName
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import pl.szczodrzynski.edziennik.getNameInitials
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import pl.szczodrzynski.edziennik.utils.Colors
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import pl.szczodrzynski.edziennik.utils.Utils
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import pl.szczodrzynski.navlib.blendColors
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import pl.szczodrzynski.edziennik.utils.html.BetterHtml
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import kotlin.math.roundToInt
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object MessagesUtils {
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@ -179,39 +183,6 @@ object MessagesUtils {
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@JvmStatic
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fun htmlToSpannable(context: Context, html: String): Spanned {
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val hexPattern = "(#[a-fA-F0-9]{6})"
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val colorRegex = "(?:color=\"$hexPattern\")|(?:style=\"color: ?${hexPattern})"
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.toRegex(RegexOption.IGNORE_CASE)
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var text = html
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.replace("\\[META:[A-z0-9]+;[0-9-]+]".toRegex(), "")
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.replace("background-color: ?$hexPattern;".toRegex(), "")
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val colorBackground = android.R.attr.colorBackground.resolveAttr(context)
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val textColorPrimary = android.R.attr.textColorPrimary.resolveAttr(context) and 0xffffff
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colorRegex.findAll(text).forEach { result ->
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val group = result.groups.drop(1).firstOrNull { it != null } ?: return@forEach
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val color = Color.parseColor(group.value)
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var newColor = 0xff000000.toInt() or color
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var blendAmount = 1
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var numIterations = 0
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while (numIterations < 100 && ColorUtils.calculateContrast(colorBackground, newColor) < 4.5f) {
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blendAmount += 2
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newColor = blendColors(color, blendAmount shl 24 or textColorPrimary)
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numIterations++
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}
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text = text.replaceRange(group.range, "#" + (newColor and 0xffffff).toString(16))
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}
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return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
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Html.fromHtml(text, Html.FROM_HTML_MODE_LEGACY)
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} else {
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Html.fromHtml(text)
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}
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return BetterHtml.fromHtml(context, html)
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}
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}
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@ -0,0 +1,89 @@
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/*
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* Copyright (c) Kuba Szczodrzyński 2020-3-17.
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*/
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package pl.szczodrzynski.edziennik.utils.html
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import android.content.Context
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import android.graphics.Color
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import android.os.Build
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import android.text.Html
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import android.text.SpannableStringBuilder
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import android.text.Spanned
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import android.text.style.BulletSpan
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import androidx.core.graphics.ColorUtils
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import pl.szczodrzynski.edziennik.dp
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import pl.szczodrzynski.edziennik.resolveAttr
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import pl.szczodrzynski.navlib.blendColors
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object BetterHtml {
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@JvmStatic
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fun fromHtml(context: Context, html: String): Spanned {
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val hexPattern = "(#[a-fA-F0-9]{6})"
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val colorRegex = "(?:color=\"$hexPattern\")|(?:style=\"color: ?${hexPattern})"
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.toRegex(RegexOption.IGNORE_CASE)
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var text = html
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.replace("\\[META:[A-z0-9]+;[0-9-]+]".toRegex(), "")
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.replace("background-color: ?$hexPattern;".toRegex(), "")
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val colorBackground = android.R.attr.colorBackground.resolveAttr(context)
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val textColorPrimary = android.R.attr.textColorPrimary.resolveAttr(context) and 0xffffff
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colorRegex.findAll(text).forEach { result ->
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val group = result.groups.drop(1).firstOrNull { it != null } ?: return@forEach
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val color = Color.parseColor(group.value)
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var newColor = 0xff000000.toInt() or color
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var blendAmount = 1
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var numIterations = 0
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while (numIterations < 100 && ColorUtils.calculateContrast(colorBackground, newColor) < 4.5f) {
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blendAmount += 2
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newColor = blendColors(color, blendAmount shl 24 or textColorPrimary)
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numIterations++
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}
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text = text.replaceRange(group.range, "#" + (newColor and 0xffffff).toString(16))
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}
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/*val olRegex = """<ol>(.+?)</\s*?ol>"""
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.toRegex(setOf(RegexOption.DOT_MATCHES_ALL, RegexOption.IGNORE_CASE))
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olRegex.findAll(text).forEach {
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text.replaceRange(
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it.range,
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text.slice(it.range).replace("li>", "_li>")
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)
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}*/
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@Suppress("DEPRECATION")
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val htmlSpannable = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
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Html.fromHtml(
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text,
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Html.FROM_HTML_SEPARATOR_LINE_BREAK_LIST_ITEM or Html.FROM_HTML_SEPARATOR_LINE_BREAK_LIST or Html.FROM_HTML_SEPARATOR_LINE_BREAK_DIV,
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null,
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LiTagHandler()
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)
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} else {
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Html.fromHtml(text, null, LiTagHandler())
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}
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val spannableBuilder = SpannableStringBuilder(htmlSpannable)
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val bulletSpans = spannableBuilder.getSpans(0, spannableBuilder.length, BulletSpan::class.java)
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bulletSpans.forEach {
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val start = spannableBuilder.getSpanStart(it)
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val end = spannableBuilder.getSpanEnd(it)
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spannableBuilder.removeSpan(it)
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spannableBuilder.setSpan(
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ImprovedBulletSpan(bulletRadius = 3.dp, startWidth = 24.dp, gapWidth = 8.dp),
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start,
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end,
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Spanned.SPAN_INCLUSIVE_EXCLUSIVE
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)
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}
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return spannableBuilder
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}
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}
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@ -0,0 +1,79 @@
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/*
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* Copyright (c) Kuba Szczodrzyński 2020-3-17.
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*/
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/**
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* https://github.com/davidbilik/bullet-span-sample/blob/master/app/src/main/java/cz/davidbilik/bulletsample/ImprovedBulletSpan.kt
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*/
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package pl.szczodrzynski.edziennik.utils.html
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.Path
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import android.graphics.Path.Direction
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import android.text.Layout
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import android.text.Spanned
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import android.text.style.LeadingMarginSpan
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/**
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* Copy of [android.text.style.BulletSpan] from android SDK 28 with removed internal code
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*/
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class ImprovedBulletSpan(
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val bulletRadius: Int = STANDARD_BULLET_RADIUS,
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val startWidth: Int = STANDARD_GAP_WIDTH,
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val gapWidth: Int = STANDARD_GAP_WIDTH,
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val color: Int = STANDARD_COLOR
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) : LeadingMarginSpan {
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companion object {
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// Bullet is slightly bigger to avoid aliasing artifacts on mdpi devices.
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private const val STANDARD_BULLET_RADIUS = 4
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private const val STANDARD_GAP_WIDTH = 2
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private const val STANDARD_COLOR = 0
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}
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private var mBulletPath: Path? = null
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override fun getLeadingMargin(first: Boolean): Int {
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return startWidth + 2 * bulletRadius + gapWidth
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}
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override fun drawLeadingMargin(
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canvas: Canvas, paint: Paint, x: Int, dir: Int,
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top: Int, baseline: Int, bottom: Int,
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text: CharSequence, start: Int, end: Int,
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first: Boolean,
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layout: Layout?
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) {
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if ((text as Spanned).getSpanStart(this) == start) {
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val style = paint.style
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paint.style = Paint.Style.FILL
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val yPosition = if (layout != null) {
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val line = layout.getLineForOffset(start)
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layout.getLineBaseline(line).toFloat() - bulletRadius * 2f
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} else {
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(top + bottom) / 2f
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}
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val xPosition = startWidth + (x + dir * bulletRadius).toFloat()
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if (canvas.isHardwareAccelerated) {
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if (mBulletPath == null) {
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mBulletPath = Path()
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mBulletPath!!.addCircle(0.0f, 0.0f, bulletRadius.toFloat(), Direction.CW)
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}
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canvas.save()
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canvas.translate(xPosition, yPosition)
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canvas.drawPath(mBulletPath!!, paint)
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canvas.restore()
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} else {
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canvas.drawCircle(xPosition, yPosition, bulletRadius.toFloat(), paint)
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}
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paint.style = style
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}
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}
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}
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@ -0,0 +1,45 @@
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/*
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* Copyright (c) Kuba Szczodrzyński 2020-3-17.
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*/
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/**
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* https://github.com/davidbilik/bullet-span-sample/blob/master/app/src/main/java/cz/davidbilik/bulletsample/LiTagHandler.kt
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*/
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package pl.szczodrzynski.edziennik.utils.html
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import android.text.Editable
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import android.text.Html
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import android.text.Spannable
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import android.text.Spanned
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import android.text.style.BulletSpan
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import org.xml.sax.XMLReader
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/**
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* [Html.TagHandler] implementation that processes <ul> and <li> tags and creates bullets.
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*
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* Note: This class is only applied on SDK < 25 and processes only one-level list, nested lists do not work.
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*/
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class LiTagHandler : Html.TagHandler {
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/**
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* Helper marker class. Idea stolen from [Html.fromHtml] implementation
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*/
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class Bullet
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override fun handleTag(opening: Boolean, tag: String, output: Editable, xmlReader: XMLReader) {
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if (tag == "li" && opening) {
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output.setSpan(Bullet(), output.length, output.length, Spannable.SPAN_INCLUSIVE_EXCLUSIVE)
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}
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if (tag == "li" && !opening) {
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output.append("\n")
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val lastMark = output.getSpans(0, output.length, Bullet::class.java).lastOrNull()
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lastMark?.let {
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val start = output.getSpanStart(it)
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output.removeSpan(it)
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if (start != output.length) {
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output.setSpan(BulletSpan(), start, output.length, Spanned.SPAN_INCLUSIVE_EXCLUSIVE)
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}
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}
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}
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}
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}
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