From 66683bc17d86f3d05a2e882fc09b5b2a5932cb25 Mon Sep 17 00:00:00 2001 From: Christian Schneppe Date: Mon, 20 Nov 2017 20:02:12 +0100 Subject: support for basic IM styling --- .../de/pixart/messenger/utils/StylingHelper.java | 134 +++++++++++++++++++++ 1 file changed, 134 insertions(+) create mode 100644 src/main/java/de/pixart/messenger/utils/StylingHelper.java (limited to 'src/main/java/de/pixart/messenger/utils/StylingHelper.java') diff --git a/src/main/java/de/pixart/messenger/utils/StylingHelper.java b/src/main/java/de/pixart/messenger/utils/StylingHelper.java new file mode 100644 index 000000000..913baa407 --- /dev/null +++ b/src/main/java/de/pixart/messenger/utils/StylingHelper.java @@ -0,0 +1,134 @@ +/* + * Copyright (c) 2017, Daniel Gultsch All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * 3. Neither the name of the copyright holder nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +package de.pixart.messenger.utils; + +import android.graphics.Color; +import android.graphics.Typeface; +import android.support.annotation.ColorInt; +import android.text.Editable; +import android.text.ParcelableSpan; +import android.text.Spanned; +import android.text.TextWatcher; +import android.text.style.ForegroundColorSpan; +import android.text.style.StrikethroughSpan; +import android.text.style.StyleSpan; +import android.text.style.TypefaceSpan; +import android.widget.EditText; + +import java.util.Arrays; +import java.util.List; + +public class StylingHelper { + + private static List> SPAN_CLASSES = Arrays.asList( + StyleSpan.class, + StrikethroughSpan.class, + TypefaceSpan.class, + ForegroundColorSpan.class + ); + + public static void clear(final Editable editable) { + final int end = editable.length() - 1; + for (Class clazz : SPAN_CLASSES) { + for (ParcelableSpan span : editable.getSpans(0, end, clazz)) { + editable.removeSpan(span); + } + } + } + + public static void format(final Editable editable) { + format(editable, false); + } + + public static void format(final Editable editable, final boolean replaceStyleAnnotation) { + for (ImStyleParser.Style style : ImStyleParser.parse(editable)) { + editable.setSpan(createSpanForStyle(style), style.getStart(), style.getEnd(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); + if (replaceStyleAnnotation) { + editable.replace(style.getStart(), style.getStart() + 1, "\u200B"); + editable.replace(style.getEnd(), style.getEnd() + 1, "\u200B"); + } + } + } + + public static void format(final Editable editable, @ColorInt int color) { + for (ImStyleParser.Style style : ImStyleParser.parse(editable)) { + editable.setSpan(createSpanForStyle(style), style.getStart() + 1, style.getEnd() - 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); + editable.setSpan(new ForegroundColorSpan(color), style.getStart(), style.getStart() + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); + editable.setSpan(new ForegroundColorSpan(color), style.getEnd(), style.getEnd() + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); + } + } + + private static ParcelableSpan createSpanForStyle(ImStyleParser.Style style) { + switch (style.getCharacter()) { + case '*': + return new StyleSpan(Typeface.BOLD); + case '_': + return new StyleSpan(Typeface.ITALIC); + case '~': + return new StrikethroughSpan(); + case '`': + return new TypefaceSpan("monospace"); + default: + throw new AssertionError("Unknown Style"); + } + } + + public static class MessageEditorStyler implements TextWatcher { + + private final EditText mEditText; + + public MessageEditorStyler(EditText editText) { + this.mEditText = editText; + } + + @Override + public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { + + } + + @Override + public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { + + } + + @Override + public void afterTextChanged(Editable editable) { + clear(editable); + final int color = mEditText.getCurrentTextColor(); + final int syntaxColor = Color.argb( + Math.round(Color.alpha(color) * 0.5f), + Color.red(color), + Color.green(color), + Color.blue(color) + ); + format(editable, syntaxColor); + } + } +} -- cgit v1.2.3