131 lines
4.7 KiB
Java
131 lines
4.7 KiB
Java
/*
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* Copyright (c) 2017, Daniel Gultsch All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package eu.siacs.conversations.utils;
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import android.graphics.Color;
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import android.graphics.Typeface;
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import android.support.annotation.ColorInt;
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import android.text.Editable;
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import android.text.ParcelableSpan;
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import android.text.Spanned;
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import android.text.TextWatcher;
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import android.text.style.ForegroundColorSpan;
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import android.text.style.StrikethroughSpan;
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import android.text.style.StyleSpan;
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import android.text.style.TypefaceSpan;
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import android.widget.EditText;
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import java.util.Arrays;
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import java.util.List;
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import eu.siacs.conversations.ui.text.QuoteSpan;
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public class StylingHelper {
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private static List<? extends Class<? extends ParcelableSpan>> SPAN_CLASSES = Arrays.asList(
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StyleSpan.class,
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StrikethroughSpan.class,
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TypefaceSpan.class,
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ForegroundColorSpan.class
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);
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public static void clear(final Editable editable) {
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final int end = editable.length() - 1;
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for (Class<? extends ParcelableSpan> clazz : SPAN_CLASSES) {
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for (ParcelableSpan span : editable.getSpans(0, end, clazz)) {
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editable.removeSpan(span);
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}
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}
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}
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public static void format(final Editable editable, @ColorInt int textColor) {
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for (ImStyleParser.Style style : ImStyleParser.parse(editable)) {
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final int keywordLength = style.getKeyword().length();
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editable.setSpan(createSpanForStyle(style), style.getStart() + keywordLength, style.getEnd() - keywordLength + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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makeKeywordOpaque(editable, style.getStart(), style.getStart() + keywordLength, textColor);
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makeKeywordOpaque(editable, style.getEnd() - keywordLength + 1, style.getEnd() + 1, textColor);
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}
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}
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private static ParcelableSpan createSpanForStyle(ImStyleParser.Style style) {
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switch (style.getKeyword()) {
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case "*":
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return new StyleSpan(Typeface.BOLD);
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case "_":
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return new StyleSpan(Typeface.ITALIC);
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case "~":
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return new StrikethroughSpan();
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case "`":
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case "```":
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return new TypefaceSpan("monospace");
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default:
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throw new AssertionError("Unknown Style");
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}
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}
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private static void makeKeywordOpaque(final Editable editable, int start, int end, @ColorInt int fallbackTextColor) {
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QuoteSpan[] quoteSpans = editable.getSpans(start, end, QuoteSpan.class);
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@ColorInt int textColor = quoteSpans.length > 0 ? quoteSpans[0].getColor() : fallbackTextColor;
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@ColorInt int keywordColor = transformColor(textColor);
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editable.setSpan(new ForegroundColorSpan(keywordColor), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
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}
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private static
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@ColorInt
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int transformColor(@ColorInt int c) {
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return Color.argb(Math.round(Color.alpha(c) * 0.6f), Color.red(c), Color.green(c), Color.blue(c));
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}
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public static class MessageEditorStyler implements TextWatcher {
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private final EditText mEditText;
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public MessageEditorStyler(EditText editText) {
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this.mEditText = editText;
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}
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@Override
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public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
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}
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@Override
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public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
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}
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@Override
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public void afterTextChanged(Editable editable) {
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clear(editable);
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format(editable, mEditText.getCurrentTextColor());
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}
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}
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}
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