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/*
* Copyright (C) 2012 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.dialer.dialpad;
import android.telephony.PhoneNumberUtils;
import android.text.Spanned;
import android.text.method.DialerKeyListener;
/**
* {@link DialerKeyListener} with Unicode support. Converts any Unicode(e.g. Arabic) characters
* that represent digits into digits before filtering the results so that we can support
* pasted digits from Unicode languages.
*/
public class UnicodeDialerKeyListener extends DialerKeyListener {
public static final UnicodeDialerKeyListener INSTANCE = new UnicodeDialerKeyListener();
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
final String converted = PhoneNumberUtils.convertKeypadLettersToDigits(
PhoneNumberUtils.replaceUnicodeDigits(source.toString()));
// PhoneNumberUtils.replaceUnicodeDigits performs a character for character replacement,
// so we can assume that start and end positions should remain unchanged.
CharSequence result = super.filter(converted, start, end, dest, dstart, dend);
if (result == null) {
if (source.equals(converted)) {
// There was no conversion or filtering performed. Just return null according to
// the behavior of DialerKeyListener.
return null;
} else {
// filter returns null if the charsequence is to be returned unchanged/unfiltered.
// But in this case we do want to return a modified character string (even if
// none of the characters in the modified string are filtered). So if
// result == null we return the unfiltered but converted numeric string instead.
return converted.subSequence(start, end);
}
}
return result;
}
}
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