1/*
2 * Copyright (C) 2017 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
17package com.android.settingslib.inputmethod;
18
19import android.content.Context;
20import android.support.v7.preference.Preference;
21import android.text.TextUtils;
22import android.view.inputmethod.InputMethodInfo;
23import android.view.inputmethod.InputMethodSubtype;
24
25import com.android.internal.annotations.VisibleForTesting;
26import com.android.internal.inputmethod.InputMethodUtils;
27
28import java.text.Collator;
29import java.util.Locale;
30
31/**
32 * Input method subtype preference.
33 *
34 * This preference represents a subtype of an IME. It is used to enable or disable the subtype.
35 */
36public class InputMethodSubtypePreference extends SwitchWithNoTextPreference {
37    private final boolean mIsSystemLocale;
38    private final boolean mIsSystemLanguage;
39
40    public InputMethodSubtypePreference(final Context context, final InputMethodSubtype subtype,
41            final InputMethodInfo imi) {
42        this(context,
43                imi.getId() + subtype.hashCode(),
44                InputMethodAndSubtypeUtil.getSubtypeLocaleNameAsSentence(subtype, context, imi),
45                subtype.getLocale(),
46                context.getResources().getConfiguration().locale);
47    }
48
49    @VisibleForTesting
50    InputMethodSubtypePreference(
51            final Context context,
52            final String prefKey,
53            final CharSequence title,
54            final String subtypeLocaleString,
55            final Locale systemLocale) {
56        super(context);
57        setPersistent(false);
58        setKey(prefKey);
59        setTitle(title);
60        if (TextUtils.isEmpty(subtypeLocaleString)) {
61            mIsSystemLocale = false;
62            mIsSystemLanguage = false;
63        } else {
64            mIsSystemLocale = subtypeLocaleString.equals(systemLocale.toString());
65            mIsSystemLanguage = mIsSystemLocale
66                    || InputMethodUtils.getLanguageFromLocaleString(subtypeLocaleString)
67                            .equals(systemLocale.getLanguage());
68        }
69    }
70
71    public int compareTo(final Preference rhs, final Collator collator) {
72        if (this == rhs) {
73            return 0;
74        }
75        if (rhs instanceof InputMethodSubtypePreference) {
76            final InputMethodSubtypePreference rhsPref = (InputMethodSubtypePreference) rhs;
77            if (mIsSystemLocale && !rhsPref.mIsSystemLocale) {
78                return -1;
79            }
80            if (!mIsSystemLocale && rhsPref.mIsSystemLocale) {
81                return 1;
82            }
83            if (mIsSystemLanguage && !rhsPref.mIsSystemLanguage) {
84                return -1;
85            }
86            if (!mIsSystemLanguage && rhsPref.mIsSystemLanguage) {
87                return 1;
88            }
89            final CharSequence title = getTitle();
90            final CharSequence rhsTitle = rhs.getTitle();
91            final boolean emptyTitle = TextUtils.isEmpty(title);
92            final boolean rhsEmptyTitle = TextUtils.isEmpty(rhsTitle);
93            if (!emptyTitle && !rhsEmptyTitle) {
94                return collator.compare(title.toString(), rhsTitle.toString());
95            }
96            // For historical reasons, an empty text needs to be put at the first.
97            return (emptyTitle ? -1 : 0) - (rhsEmptyTitle ? -1 : 0);
98        }
99        return super.compareTo(rhs);
100    }
101}
102