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      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 
     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      */
     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      */
     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