KeyguardUserSwitcher.java revision 4538027dedbe7ebfc884ca35d20522a2a21a42d4 
1/*
2 * Copyright (C) 2014 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.systemui.statusbar.policy;
18
19import android.content.Context;
20import android.database.DataSetObserver;
21import android.provider.Settings;
22import android.view.LayoutInflater;
23import android.view.View;
24import android.view.ViewGroup;
25import android.view.ViewStub;
26import android.widget.TextView;
27
28import com.android.systemui.R;
29import com.android.systemui.statusbar.phone.KeyguardStatusBarView;
30import com.android.systemui.statusbar.phone.UserAvatarView;
31
32/**
33 * Manages the user switcher on the Keyguard.
34 */
35public class KeyguardUserSwitcher {
36
37    private static final String TAG = "KeyguardUserSwitcher";
38    private static final boolean ALWAYS_ON = false;
39    private static final String SIMPLE_USER_SWITCHER_GLOBAL_SETTING =
40            "lockscreenSimpleUserSwitcher";
41
42    private final ViewGroup mUserSwitcher;
43    private final KeyguardStatusBarView mStatusBarView;
44    private final Adapter mAdapter;
45    private final boolean mSimpleUserSwitcher;
46
47    public KeyguardUserSwitcher(Context context, ViewStub userSwitcher,
48            KeyguardStatusBarView statusBarView, UserSwitcherController userSwitcherController) {
49        if (context.getResources().getBoolean(R.bool.config_keyguardUserSwitcher) || ALWAYS_ON) {
50            mUserSwitcher = (ViewGroup) userSwitcher.inflate();
51            mStatusBarView = statusBarView;
52            mStatusBarView.setKeyguardUserSwitcher(this);
53            mAdapter = new Adapter(context, userSwitcherController);
54            mAdapter.registerDataSetObserver(mDataSetObserver);
55            mSimpleUserSwitcher = Settings.Global.getInt(context.getContentResolver(),
56                    SIMPLE_USER_SWITCHER_GLOBAL_SETTING, 0) != 0;
57        } else {
58            mUserSwitcher = null;
59            mStatusBarView = null;
60            mAdapter = null;
61            mSimpleUserSwitcher = false;
62        }
63    }
64
65    public void setKeyguard(boolean keyguard) {
66        if (mUserSwitcher != null) {
67            if (keyguard && shouldExpandByDefault()) {
68                show();
69            } else {
70                hide();
71            }
72        }
73    }
74
75    /**
76     * @return true if the user switcher should be expanded by default on the lock screen.
77     * @see android.os.UserManager#isUserSwitcherEnabled()
78     */
79    private boolean shouldExpandByDefault() {
80        return mSimpleUserSwitcher || mAdapter.getSwitchableUsers() > 1;
81    }
82
83    public void show() {
84        if (mUserSwitcher != null) {
85            // TODO: animate
86            mUserSwitcher.setVisibility(View.VISIBLE);
87            mStatusBarView.setKeyguardUserSwitcherShowing(true);
88        }
89    }
90
91    public void hide() {
92        if (mUserSwitcher != null) {
93            // TODO: animate
94            mUserSwitcher.setVisibility(View.GONE);
95            mStatusBarView.setKeyguardUserSwitcherShowing(false);
96        }
97    }
98
99    private void refresh() {
100        final int childCount = mUserSwitcher.getChildCount();
101        final int adapterCount = mAdapter.getCount();
102        final int N = Math.max(childCount, adapterCount);
103        for (int i = 0; i < N; i++) {
104            if (i < adapterCount) {
105                View oldView = null;
106                if (i < childCount) {
107                    oldView = mUserSwitcher.getChildAt(i);
108                }
109                View newView = mAdapter.getView(i, oldView, mUserSwitcher);
110                if (oldView == null) {
111                    // We ran out of existing views. Add it at the end.
112                    mUserSwitcher.addView(newView);
113                } else if (oldView != newView) {
114                    // We couldn't rebind the view. Replace it.
115                    mUserSwitcher.removeViewAt(i);
116                    mUserSwitcher.addView(newView, i);
117                }
118            } else {
119                int lastIndex = mUserSwitcher.getChildCount() - 1;
120                mUserSwitcher.removeViewAt(lastIndex);
121            }
122        }
123    }
124
125    public final DataSetObserver mDataSetObserver = new DataSetObserver() {
126        @Override
127        public void onChanged() {
128            refresh();
129        }
130    };
131
132    public static class Adapter extends UserSwitcherController.BaseUserAdapter implements
133            View.OnClickListener {
134
135        private Context mContext;
136
137        public Adapter(Context context, UserSwitcherController controller) {
138            super(controller);
139            mContext = context;
140        }
141
142        @Override
143        public View getView(int position, View convertView, ViewGroup parent) {
144            UserSwitcherController.UserRecord item = getItem(position);
145
146            if (convertView == null
147                    || !(convertView.getTag() instanceof UserSwitcherController.UserRecord)) {
148                convertView = LayoutInflater.from(mContext).inflate(
149                        R.layout.keyguard_user_switcher_item, parent, false);
150                convertView.setOnClickListener(this);
151            }
152
153            TextView nameView = (TextView) convertView.findViewById(R.id.name);
154            UserAvatarView pictureView = (UserAvatarView) convertView.findViewById(R.id.picture);
155
156            nameView.setText(getName(mContext, item));
157            if (item.picture == null) {
158                pictureView.setDrawable(mContext.getDrawable(R.drawable.ic_account_circle_qs));
159            } else {
160                pictureView.setBitmap(item.picture);
161            }
162            convertView.setActivated(item.isCurrent);
163            convertView.setTag(item);
164            return convertView;
165        }
166
167        @Override
168        public void onClick(View v) {
169            switchTo(((UserSwitcherController.UserRecord)v.getTag()));
170        }
171    }
172}
173