155 lines
5.9 KiB
Kotlin
155 lines
5.9 KiB
Kotlin
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/*
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* Twidere - Twitter client for Android
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*
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* Copyright (C) 2012-2017 Mariotaku Lee <mariotaku.lee@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.mariotaku.twidere.extension
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import android.graphics.drawable.Drawable
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import android.text.Spannable
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import android.text.Spanned
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import android.widget.TextView
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import org.mariotaku.commons.text.CodePointArray
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import org.mariotaku.commons.text.get
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import org.mariotaku.twidere.text.style.EmojiSpan
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import org.mariotaku.twidere.text.util.EmojiEditableFactory
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import org.mariotaku.twidere.text.util.EmojiSpannableFactory
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import org.mariotaku.twidere.util.ExternalThemeManager
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/**
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* Created by mariotaku on 2017/5/13.
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*/
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fun TextView.setupEmojiFactory() {
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if (isInEditMode) return
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setSpannableFactory(EmojiSpannableFactory(this))
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setEditableFactory(EmojiEditableFactory(this))
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}
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fun ExternalThemeManager.Emoji.applyTo(text: Spannable, textStart: Int = 0, textLength: Int = text.length) {
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if (!isSupported) return
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val array = CodePointArray(text)
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var arrayIdx = array.length() - 1
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while (arrayIdx >= 0) {
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val codePoint = array[arrayIdx]
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if (isEmoji(codePoint)) {
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val arrayEnd = arrayIdx + 1
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var arrayIdxOffset = 0
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val textIdx = array.indexOfText(codePoint, arrayIdx)
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var textIdxOffset = 0
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var skippedIndex = 0
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if (textIdx == -1 || textIdx < textStart) {
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arrayIdx--
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continue
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}
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val textEnd = textIdx + Character.charCount(codePoint)
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if (arrayIdx > 0) {
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val prevCodePoint = array[arrayIdx - 1]
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when {
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isRegionalIndicatorSymbol(codePoint) -> if (isRegionalIndicatorSymbol(prevCodePoint)) {
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arrayIdxOffset = -1
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textIdxOffset = -Character.charCount(prevCodePoint)
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skippedIndex = -1
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}
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isModifier(codePoint) -> if (isEmoji(prevCodePoint)) {
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arrayIdxOffset = -1
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textIdxOffset = -Character.charCount(prevCodePoint)
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skippedIndex = -1
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}
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isKeyCap(codePoint) -> if (isPhoneNumberSymbol(prevCodePoint)) {
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arrayIdxOffset = -1
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textIdxOffset = -Character.charCount(prevCodePoint)
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skippedIndex = -1
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}
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isZeroWidthJoin(prevCodePoint) -> {
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var notValidControlCount = 0
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var charCount = 0
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for (i in arrayIdx - 1 downTo 0) {
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val cp = array.get(i)
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charCount += Character.charCount(cp)
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if (isZeroWidthJoin(cp) || isVariationSelector(cp)) {
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// Ignore
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notValidControlCount = 0
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continue
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}
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notValidControlCount++
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if (notValidControlCount > 1 || i == 0) {
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arrayIdxOffset = i - arrayIdx + 1
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textIdxOffset = -charCount + Character.charCount(cp)
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skippedIndex = i - arrayIdx + 1
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break
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}
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}
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}
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}
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}
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if (textEnd > textStart + textLength) {
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arrayIdx--
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continue
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}
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var spans = text.getSpans(textIdx + textIdxOffset, textEnd, EmojiSpan::class.java)
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if (spans.isEmpty()) {
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var drawable: Drawable? = getEmojiDrawableFor(*array[arrayIdx + arrayIdxOffset..arrayEnd])
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if (drawable == null) {
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// Not emoji combination, just use fallback
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textIdxOffset = 0
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arrayIdxOffset = 0
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skippedIndex = 0
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spans = text.getSpans(textIdx + textIdxOffset, textEnd, EmojiSpan::class.java)
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if (spans.isEmpty()) {
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drawable = getEmojiDrawableFor(*array[arrayIdx + arrayIdxOffset..arrayEnd])
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}
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}
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if (drawable != null) {
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text.setSpan(EmojiSpan(drawable), textIdx + textIdxOffset, textEnd,
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Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
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}
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}
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arrayIdx += skippedIndex
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}
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arrayIdx--
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}
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}
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private fun isVariationSelector(codePoint: Int): Boolean {
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return codePoint == 0xfe0f
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}
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private fun isZeroWidthJoin(codePoint: Int): Boolean {
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return codePoint == 0x200d
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}
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private fun isPhoneNumberSymbol(codePoint: Int): Boolean {
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return codePoint == 0x0023 || codePoint == 0x002a || codePoint in 0x0030..0x0039
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}
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private fun isModifier(codePoint: Int): Boolean {
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return codePoint in 0x1f3fb..0x1f3ff
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}
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private fun isEmoji(codePoint: Int): Boolean {
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return !Character.isLetterOrDigit(codePoint)
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}
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private fun isRegionalIndicatorSymbol(codePoint: Int): Boolean {
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return codePoint in 0x1f1e6..0x1f1ff
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}
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private fun isKeyCap(codePoint: Int): Boolean {
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return codePoint == 0x20e3
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}
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