/*
* Copyright 2015 Google Inc. All rights reserved.
*
* 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.google.samples.apps.iosched.ui.widget;
import android.content.Context;
import android.graphics.Typeface;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.style.StyleSpan;
import android.util.AttributeSet;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* An extension to TextView which marks up search result snippets.
*
* It looks for search terms surrounded by curly brace tokens e.g. “blah {Android} blah” and marks
* the search term up as bold.
*/
public class SearchSnippet extends TextView {
private static final Pattern PATTERN_SEARCH_TERM = Pattern.compile("(\\{[^\\}]+\\})", Pattern.DOTALL);
public SearchSnippet(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void setText(CharSequence text, BufferType type) {
if (!TextUtils.isEmpty(text)) {
Matcher matcher = PATTERN_SEARCH_TERM.matcher(text);
SpannableStringBuilder ssb = new SpannableStringBuilder(text);
List<String> hits = new ArrayList<>();
while (matcher.find()) {
hits.add(matcher.group(1));
}
for (String hit : hits) {
int start = ssb.toString().indexOf(hit);
int end = start + hit.length();
ssb.setSpan(new StyleSpan(Typeface.BOLD), start, end, 0);
// delete the markup tokens
ssb.delete(end - 1, end);
ssb.delete(start, start + 1);
}
text = ssb;
}
super.setText(text, type);
}
}