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      1 /*
      2  * Copyright (C) 2013 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.server.policy.keyguard;
     18 
     19 import android.app.ActivityManager;
     20 import android.content.Context;
     21 import android.os.RemoteException;
     22 import android.util.Slog;
     23 
     24 import com.android.internal.policy.IKeyguardService;
     25 import com.android.internal.policy.IKeyguardStateCallback;
     26 import com.android.internal.widget.LockPatternUtils;
     27 
     28 /**
     29  * Maintains a cached copy of Keyguard's state.
     30  * @hide
     31  */
     32 public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
     33     private static final String TAG = "KeyguardStateMonitor";
     34 
     35     // These cache the current state of Keyguard to improve performance and avoid deadlock. After
     36     // Keyguard changes its state, it always triggers a layout in window manager. Because
     37     // IKeyguardStateCallback is synchronous and because these states are declared volatile, it's
     38     // guaranteed that window manager picks up the new state all the time in the layout caused by
     39     // the state change of Keyguard. To be extra safe, assume most restrictive values until Keyguard
     40     // tells us the actual value.
     41     private volatile boolean mIsShowing = true;
     42     private volatile boolean mSimSecure = true;
     43     private volatile boolean mInputRestricted = true;
     44 
     45     private int mCurrentUserId;
     46 
     47     private final LockPatternUtils mLockPatternUtils;
     48 
     49     public KeyguardStateMonitor(Context context, IKeyguardService service) {
     50         mLockPatternUtils = new LockPatternUtils(context);
     51         mCurrentUserId = ActivityManager.getCurrentUser();
     52         try {
     53             service.addStateMonitorCallback(this);
     54         } catch (RemoteException e) {
     55             Slog.w(TAG, "Remote Exception", e);
     56         }
     57     }
     58 
     59     public boolean isShowing() {
     60         return mIsShowing;
     61     }
     62 
     63     public boolean isSecure() {
     64         return mLockPatternUtils.isSecure(getCurrentUser()) || mSimSecure;
     65     }
     66 
     67     public boolean isInputRestricted() {
     68         return mInputRestricted;
     69     }
     70 
     71     @Override // Binder interface
     72     public void onShowingStateChanged(boolean showing) {
     73         mIsShowing = showing;
     74     }
     75 
     76     @Override // Binder interface
     77     public void onSimSecureStateChanged(boolean simSecure) {
     78         mSimSecure = simSecure;
     79     }
     80 
     81     public synchronized void setCurrentUser(int userId) {
     82         mCurrentUserId = userId;
     83     }
     84 
     85     private synchronized int getCurrentUser() {
     86         return mCurrentUserId;
     87     }
     88 
     89     @Override // Binder interface
     90     public void onInputRestrictedStateChanged(boolean inputRestricted) {
     91         mInputRestricted = inputRestricted;
     92     }
     93 }