1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.contacts.format; 18 19 import android.text.SpannableString; 20 import android.text.style.ForegroundColorSpan; 21 import android.widget.TextView; 22 23 /** 24 * Highlights the text in a text field. 25 */ 26 public class PrefixHighlighter { 27 private final int mPrefixHighlightColor; 28 29 private ForegroundColorSpan mPrefixColorSpan; 30 PrefixHighlighter(int prefixHighlightColor)31 public PrefixHighlighter(int prefixHighlightColor) { 32 mPrefixHighlightColor = prefixHighlightColor; 33 } 34 35 /** 36 * Sets the text on the given text view, highlighting the word that matches the given prefix. 37 * 38 * @param view the view on which to set the text 39 * @param text the string to use as the text 40 * @param prefix the prefix to look for 41 */ setText(TextView view, String text, char[] prefix)42 public void setText(TextView view, String text, char[] prefix) { 43 view.setText(apply(text, prefix)); 44 } 45 46 /** 47 * Returns a CharSequence which highlights the given prefix if found in the given text. 48 * 49 * @param text the text to which to apply the highlight 50 * @param prefix the prefix to look for 51 */ apply(CharSequence text, char[] prefix)52 public CharSequence apply(CharSequence text, char[] prefix) { 53 int index = FormatUtils.indexOfWordPrefix(text, prefix); 54 if (index != -1) { 55 if (mPrefixColorSpan == null) { 56 mPrefixColorSpan = new ForegroundColorSpan(mPrefixHighlightColor); 57 } 58 59 SpannableString result = new SpannableString(text); 60 result.setSpan(mPrefixColorSpan, index, index + prefix.length, 0 /* flags */); 61 return result; 62 } else { 63 return text; 64 } 65 } 66 } 67