1 /*
2  * Copyright (C) 2012 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 
17 package com.android.settings.users;
18 
19 import android.content.Context;
20 import android.graphics.drawable.Drawable;
21 import android.os.UserHandle;
22 import android.os.UserManager;
23 import android.util.AttributeSet;
24 
25 import androidx.preference.PreferenceViewHolder;
26 
27 import com.android.settingslib.RestrictedPreference;
28 
29 import java.util.Comparator;
30 
31 /**
32  * Preference for a user that appear on {@link UserSettings} screen.
33  */
34 public class UserPreference extends RestrictedPreference {
35     private static final int ALPHA_ENABLED = 255;
36     private static final int ALPHA_DISABLED = 102;
37 
38     public static final int USERID_UNKNOWN = -10;
39     public static final int USERID_GUEST_DEFAULTS = -11;
40     public static final Comparator<UserPreference> SERIAL_NUMBER_COMPARATOR =
41             (p1, p2) -> {
42 
43                 if (p1 == null) {
44                     return -1;
45                 } else if (p2 == null) {
46                     return 1;
47                 }
48                 int sn1 = p1.getSerialNumber();
49                 int sn2 = p2.getSerialNumber();
50                 if (sn1 < sn2) {
51                     return -1;
52                 } else if (sn1 > sn2) {
53                     return 1;
54                 }
55                 return 0;
56             };
57 
58     private int mSerialNumber = -1;
59     private int mUserId = USERID_UNKNOWN;
60 
UserPreference(Context context, AttributeSet attrs)61     public UserPreference(Context context, AttributeSet attrs) {
62         this(context, attrs, USERID_UNKNOWN);
63     }
64 
UserPreference(Context context, AttributeSet attrs, int userId)65     UserPreference(Context context, AttributeSet attrs, int userId) {
66         super(context, attrs);
67         mUserId = userId;
68         useAdminDisabledSummary(true);
69     }
70 
dimIcon(boolean dimmed)71     private void dimIcon(boolean dimmed) {
72         Drawable icon = getIcon();
73         if (icon != null) {
74             icon.mutate().setAlpha(dimmed ? ALPHA_DISABLED : ALPHA_ENABLED);
75             setIcon(icon);
76         }
77     }
78 
79     @Override
shouldHideSecondTarget()80     protected boolean shouldHideSecondTarget() {
81         return true;
82     }
83 
84     @Override
onBindViewHolder(PreferenceViewHolder view)85     public void onBindViewHolder(PreferenceViewHolder view) {
86         super.onBindViewHolder(view);
87         dimIcon(isDisabledByAdmin());
88     }
89 
getSerialNumber()90     private int getSerialNumber() {
91         if (mUserId == UserHandle.myUserId()) return Integer.MIN_VALUE;
92         if (mSerialNumber < 0) {
93             // If the userId is unknown
94             if (mUserId == USERID_UNKNOWN) {
95                 return Integer.MAX_VALUE;
96             } else if (mUserId == USERID_GUEST_DEFAULTS) {
97                 return Integer.MAX_VALUE - 1;
98             }
99             mSerialNumber = ((UserManager) getContext().getSystemService(Context.USER_SERVICE))
100                     .getUserSerialNumber(mUserId);
101             if (mSerialNumber < 0) return mUserId;
102         }
103         return mSerialNumber;
104     }
105 
getUserId()106     public int getUserId() {
107         return mUserId;
108     }
109 }
110