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/*
* Copyright (C) 2010 Google Inc.
*
* 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.inputmethod.latin;
import java.util.Locale;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;
import android.text.TextUtils;
/**
* Keeps track of list of selected input languages and the current
* input language that the user has selected.
*/
public class LanguageSwitcher {
private Locale[] mLocales;
private LatinIME mIme;
private String[] mSelectedLanguageArray;
private String mSelectedLanguages;
private int mCurrentIndex = 0;
private String mDefaultInputLanguage;
private Locale mDefaultInputLocale;
public LanguageSwitcher(LatinIME ime) {
mIme = ime;
mLocales = new Locale[0];
}
public Locale[] getLocales() {
return mLocales;
}
public int getLocaleCount() {
return mLocales.length;
}
/**
* Loads the currently selected input languages from shared preferences.
* @param sp
* @return whether there was any change
*/
public boolean loadLocales(SharedPreferences sp) {
String selectedLanguages = sp.getString(LatinIME.PREF_SELECTED_LANGUAGES, null);
String currentLanguage = sp.getString(LatinIME.PREF_INPUT_LANGUAGE, null);
if (selectedLanguages == null || selectedLanguages.length() < 1) {
loadDefaults();
if (mLocales.length == 0) {
return false;
}
mLocales = new Locale[0];
return true;
}
if (selectedLanguages.equals(mSelectedLanguages)) {
return false;
}
mSelectedLanguageArray = selectedLanguages.split(",");
mSelectedLanguages = selectedLanguages; // Cache it for comparison later
constructLocales();
mCurrentIndex = 0;
if (currentLanguage != null) {
// Find the index
mCurrentIndex = 0;
for (int i = 0; i < mLocales.length; i++) {
if (mSelectedLanguageArray[i].equals(currentLanguage)) {
mCurrentIndex = i;
break;
}
}
// If we didn't find the index, use the first one
}
return true;
}
private void loadDefaults() {
mDefaultInputLocale = mIme.getResources().getConfiguration().locale;
String country = mDefaultInputLocale.getCountry();
mDefaultInputLanguage = mDefaultInputLocale.getLanguage() +
(TextUtils.isEmpty(country) ? "" : "_" + country);
}
private void constructLocales() {
mLocales = new Locale[mSelectedLanguageArray.length];
for (int i = 0; i < mLocales.length; i++) {
mLocales[i] = new Locale(mSelectedLanguageArray[i]);
}
}
/**
* Returns the currently selected input language code, or the display language code if
* no specific locale was selected for input.
*/
public String getInputLanguage() {
if (getLocaleCount() == 0) return mDefaultInputLanguage;
return mSelectedLanguageArray[mCurrentIndex];
}
/**
* Returns the list of enabled language codes.
*/
public String[] getEnabledLanguages() {
return mSelectedLanguageArray;
}
/**
* Returns the currently selected input locale, or the display locale if no specific
* locale was selected for input.
* @return
*/
public Locale getInputLocale() {
if (getLocaleCount() == 0) return mDefaultInputLocale;
return mLocales[mCurrentIndex];
}
/**
* Returns the next input locale in the list. Wraps around to the beginning of the
* list if we're at the end of the list.
* @return
*/
public Locale getNextInputLocale() {
if (getLocaleCount() == 0) return mDefaultInputLocale;
return mLocales[(mCurrentIndex + 1) % mLocales.length];
}
/**
* Returns the previous input locale in the list. Wraps around to the end of the
* list if we're at the beginning of the list.
* @return
*/
public Locale getPrevInputLocale() {
if (getLocaleCount() == 0) return mDefaultInputLocale;
return mLocales[(mCurrentIndex - 1 + mLocales.length) % mLocales.length];
}
public void reset() {
mCurrentIndex = 0;
}
public void next() {
mCurrentIndex++;
if (mCurrentIndex >= mLocales.length) mCurrentIndex = 0; // Wrap around
}
public void prev() {
mCurrentIndex--;
if (mCurrentIndex < 0) mCurrentIndex = mLocales.length - 1; // Wrap around
}
public void persist() {
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mIme);
Editor editor = sp.edit();
editor.putString(LatinIME.PREF_INPUT_LANGUAGE, getInputLanguage());
editor.commit();
}
static String toTitleCase(String s) {
if (s.length() == 0) {
return s;
}
return Character.toUpperCase(s.charAt(0)) + s.substring(1);
}
}
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