/*
* 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.ForegroundColorSpan;
import android.widget.TextView;
/**
* Highlights the text in a text field.
*/
public class PrefixHighlighter {
private final int mPrefixHighlightColor;
private ForegroundColorSpan mPrefixColorSpan;
public PrefixHighlighter(int prefixHighlightColor) {
mPrefixHighlightColor = prefixHighlightColor;
}
/**
* 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 setText(TextView view, String text, char[] prefix) {
view.setText(apply(text, prefix));
}
/**
* 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 apply(CharSequence text, char[] prefix) {
int index = FormatUtils.indexOfWordPrefix(text, prefix);
if (index != -1) {
if (mPrefixColorSpan == null) {
mPrefixColorSpan = new ForegroundColorSpan(mPrefixHighlightColor);
}
SpannableString result = new SpannableString(text);
result.setSpan(mPrefixColorSpan, index, index + prefix.length, 0 /* flags */);
return result;
} else {
return text;
}
}
}