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      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 
     17 package com.android.settings.inputmethod;
     18 
     19 import android.content.Context;
     20 import android.hardware.input.InputManager;
     21 import android.support.v7.preference.Preference;
     22 
     23 import com.android.settings.R;
     24 import com.android.settings.core.PreferenceControllerMixin;
     25 import com.android.settings.inputmethod.PhysicalKeyboardFragment.HardKeyboardDeviceInfo;
     26 import com.android.settingslib.core.AbstractPreferenceController;
     27 import com.android.settingslib.core.lifecycle.Lifecycle;
     28 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     29 import com.android.settingslib.core.lifecycle.events.OnPause;
     30 import com.android.settingslib.core.lifecycle.events.OnResume;
     31 
     32 import java.util.List;
     33 
     34 public class PhysicalKeyboardPreferenceController extends AbstractPreferenceController
     35         implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause,
     36         InputManager.InputDeviceListener {
     37 
     38     private final InputManager mIm;
     39 
     40     private Preference mPreference;
     41 
     42     public PhysicalKeyboardPreferenceController(Context context, Lifecycle lifecycle) {
     43         super(context);
     44         mIm = (InputManager) context.getSystemService(Context.INPUT_SERVICE);
     45 
     46         if (lifecycle != null) {
     47             lifecycle.addObserver(this);
     48         }
     49     }
     50 
     51     @Override
     52     public boolean isAvailable() {
     53         return true;
     54     }
     55 
     56     @Override
     57     public void updateState(Preference preference) {
     58         mPreference = preference;
     59         updateSummary();
     60     }
     61 
     62     @Override
     63     public String getPreferenceKey() {
     64         return "physical_keyboard_pref";
     65     }
     66 
     67     @Override
     68     public void onPause() {
     69         mIm.registerInputDeviceListener(this, null);
     70     }
     71 
     72     @Override
     73     public void onResume() {
     74         mIm.unregisterInputDeviceListener(this);
     75     }
     76 
     77     @Override
     78     public void onInputDeviceAdded(int deviceId) {
     79         updateSummary();
     80     }
     81 
     82     @Override
     83     public void onInputDeviceRemoved(int deviceId) {
     84         updateSummary();
     85     }
     86 
     87     @Override
     88     public void onInputDeviceChanged(int deviceId) {
     89         updateSummary();
     90     }
     91 
     92     private void updateSummary() {
     93         if (mPreference == null) {
     94             return;
     95         }
     96         final List<HardKeyboardDeviceInfo> keyboards =
     97                 PhysicalKeyboardFragment.getHardKeyboards();
     98         if (keyboards.isEmpty()) {
     99             mPreference.setSummary(R.string.disconnected);
    100             return;
    101         }
    102         String summary = null;
    103         for (HardKeyboardDeviceInfo info : keyboards) {
    104             if (summary == null) {
    105                 summary = info.mDeviceName;
    106             } else {
    107                 summary = mContext.getString(R.string.join_many_items_middle, summary,
    108                         info.mDeviceName);
    109             }
    110         }
    111         mPreference.setSummary(summary);
    112     }
    113 }
    114