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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin.utils;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.SpannedString;
import android.text.TextUtils;
import android.text.style.SuggestionSpan;
public final class SpannableStringUtils {
/**
* Copies the spans from the region <code>start...end</code> in
* <code>source</code> to the region
* <code>destoff...destoff+end-start</code> in <code>dest</code>.
* Spans in <code>source</code> that begin before <code>start</code>
* or end after <code>end</code> but overlap this range are trimmed
* as if they began at <code>start</code> or ended at <code>end</code>.
* Only SuggestionSpans that don't have the SPAN_PARAGRAPH span are copied.
*
* This code is almost entirely taken from {@link TextUtils#copySpansFrom}, except for the
* kind of span that is copied.
*
* @throws IndexOutOfBoundsException if any of the copied spans
* are out of range in <code>dest</code>.
*/
public static void copyNonParagraphSuggestionSpansFrom(Spanned source, int start, int end,
Spannable dest, int destoff) {
Object[] spans = source.getSpans(start, end, SuggestionSpan.class);
for (int i = 0; i < spans.length; i++) {
int fl = source.getSpanFlags(spans[i]);
if (0 != (fl & Spannable.SPAN_PARAGRAPH)) continue;
int st = source.getSpanStart(spans[i]);
int en = source.getSpanEnd(spans[i]);
if (st < start)
st = start;
if (en > end)
en = end;
dest.setSpan(spans[i], st - start + destoff, en - start + destoff,
fl);
}
}
/**
* Returns a CharSequence concatenating the specified CharSequences, retaining their
* SuggestionSpans that don't have the PARAGRAPH flag, but not other spans.
*
* This code is almost entirely taken from {@link TextUtils#concat(CharSequence...)}, except
* it calls copyNonParagraphSuggestionSpansFrom instead of {@link TextUtils#copySpansFrom}.
*/
public static CharSequence concatWithNonParagraphSuggestionSpansOnly(CharSequence... text) {
if (text.length == 0) {
return "";
}
if (text.length == 1) {
return text[0];
}
boolean spanned = false;
for (int i = 0; i < text.length; i++) {
if (text[i] instanceof Spanned) {
spanned = true;
break;
}
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < text.length; i++) {
sb.append(text[i]);
}
if (!spanned) {
return sb.toString();
}
SpannableString ss = new SpannableString(sb);
int off = 0;
for (int i = 0; i < text.length; i++) {
int len = text[i].length();
if (text[i] instanceof Spanned) {
copyNonParagraphSuggestionSpansFrom((Spanned) text[i], 0, len, ss, off);
}
off += len;
}
return new SpannedString(ss);
}
}
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