101 lines
3.5 KiB
Kotlin
101 lines
3.5 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.ext
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import android.content.res.Configuration
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import android.content.res.Resources
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import android.os.Build
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import android.os.Build.VERSION.SDK_INT
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import android.text.SpannableString
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import android.text.Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
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import androidx.annotation.StringRes
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import java.util.Formatter
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import kotlin.collections.ArrayList
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import kotlin.collections.HashMap
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// Credit to Michael Spitsin https://medium.com/@programmerr47/working-with-spans-in-android-ca4ab1327bc4
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@Suppress("SpreadOperator")
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fun Resources.getSpannable(@StringRes id: Int, spanParts: List<Pair<Any, Iterable<Any>>>): CharSequence {
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val resultCreator = SpannableStringCreator()
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Formatter(
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SpannableAppendable(resultCreator, spanParts),
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getLocale(configuration)
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).format(getString(id), *spanParts.map { it.first }.toTypedArray())
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return resultCreator.toSpannableString()
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}
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private fun getLocale(configuration: Configuration) =
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if (SDK_INT >= Build.VERSION_CODES.N) {
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configuration.locales[0]
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} else {
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@Suppress("Deprecation")
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configuration.locale
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}
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class SpannableStringCreator {
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private val parts = ArrayList<CharSequence>()
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private var length = 0
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private val spanMap: MutableMap<IntRange, Iterable<Any>> = HashMap()
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fun append(newText: CharSequence, spans: Iterable<Any>) = apply {
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val end = newText.length
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parts.add(newText)
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spanMap[(length..length + end)] = spans
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length += end
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}
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fun append(newText: CharSequence) = apply {
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parts.add(newText)
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length += newText.length
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}
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fun toSpannableString() = SpannableString(parts.joinToString("")).apply {
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spanMap.forEach { entry ->
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val range = entry.key
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entry.value.forEach {
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setSpan(it, range.first, range.last, SPAN_EXCLUSIVE_EXCLUSIVE)
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}
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}
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}
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}
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class SpannableAppendable(
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private val creator: SpannableStringCreator,
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spanParts: List<Pair<Any, Iterable<Any>>>
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) : Appendable {
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private val spansMap = spanParts.toMap().mapKeys { entry -> entry.key.let { it as? CharSequence ?: it.toString() } }
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override fun append(csq: CharSequence?) = apply { creator.appendSmart(csq, spansMap) }
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override fun append(csq: CharSequence?, start: Int, end: Int) = apply {
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if (csq != null) {
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if (start in 0 until end && end <= csq.length) {
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append(csq.subSequence(start, end))
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} else {
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throw IndexOutOfBoundsException("start " + start + ", end " + end + ", s.length() " + csq.length)
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}
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}
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}
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override fun append(c: Char) = apply { creator.append(c.toString()) }
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private fun SpannableStringCreator.appendSmart(csq: CharSequence?, spanDict: Map<CharSequence, Iterable<Any>>) {
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if (csq != null) {
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if (csq in spanDict) {
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append(csq, spanDict.getValue(csq))
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} else {
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val possibleMatchDict = spanDict.filter { it.key.toString() == csq }
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if (possibleMatchDict.isNotEmpty()) {
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val spanDictEntry = possibleMatchDict.entries.toList()[0]
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append(spanDictEntry.key, spanDictEntry.value)
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} else {
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append(csq)
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}
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}
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}
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}
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}
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