| /* |
| * Copyright (C) 2011 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.contacts.format; |
| |
| import android.text.SpannableString; |
| import android.text.style.CharacterStyle; |
| import android.text.style.StyleSpan; |
| import android.widget.TextView; |
| |
| /** |
| * Highlights the text in a text field. |
| */ |
| public class TextHighlighter { |
| private final String TAG = TextHighlighter.class.getSimpleName(); |
| private final static boolean DEBUG = false; |
| |
| private int mTextStyle; |
| |
| private CharacterStyle mTextStyleSpan; |
| |
| public TextHighlighter(int textStyle) { |
| mTextStyle = textStyle; |
| mTextStyleSpan = getStyleSpan(); |
| } |
| |
| /** |
| * Sets the text on the given text view, highlighting the word that matches the given prefix. |
| * |
| * @param view the view on which to set the text |
| * @param text the string to use as the text |
| * @param prefix the prefix to look for |
| */ |
| public void setPrefixText(TextView view, String text, String prefix) { |
| view.setText(applyPrefixHighlight(text, prefix)); |
| } |
| |
| private CharacterStyle getStyleSpan() { |
| return new StyleSpan(mTextStyle); |
| } |
| |
| /** |
| * Applies highlight span to the text. |
| * @param text Text sequence to be highlighted. |
| * @param start Start position of the highlight sequence. |
| * @param end End position of the highlight sequence. |
| */ |
| public void applyMaskingHighlight(SpannableString text, int start, int end) { |
| /** Sets text color of the masked locations to be highlighted. */ |
| text.setSpan(getStyleSpan(), start, end, 0); |
| } |
| |
| /** |
| * Returns a CharSequence which highlights the given prefix if found in the given text. |
| * |
| * @param text the text to which to apply the highlight |
| * @param prefix the prefix to look for |
| */ |
| public CharSequence applyPrefixHighlight(CharSequence text, String prefix) { |
| if (prefix == null) { |
| return text; |
| } |
| |
| // Skip non-word characters at the beginning of prefix. |
| int prefixStart = 0; |
| while (prefixStart < prefix.length() && |
| !Character.isLetterOrDigit(prefix.charAt(prefixStart))) { |
| prefixStart++; |
| } |
| final String trimmedPrefix = prefix.substring(prefixStart); |
| |
| int index = FormatUtils.indexOfWordPrefix(text, trimmedPrefix); |
| if (index != -1) { |
| final SpannableString result = new SpannableString(text); |
| result.setSpan(mTextStyleSpan, index, index + trimmedPrefix.length(), 0 /* flags */); |
| return result; |
| } else { |
| return text; |
| } |
| } |
| } |