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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 
     15 package com.android.systemui.fragments;
     16 
     17 import android.app.Fragment;
     18 import android.content.res.Configuration;
     19 import android.os.Handler;
     20 import android.util.ArrayMap;
     21 import android.view.View;
     22 
     23 import com.android.systemui.ConfigurationChangedReceiver;
     24 import com.android.systemui.Dumpable;
     25 import com.android.systemui.SystemUIFactory;
     26 import com.android.systemui.qs.QSFragment;
     27 import com.android.systemui.statusbar.phone.NavigationBarFragment;
     28 
     29 import java.io.FileDescriptor;
     30 import java.io.PrintWriter;
     31 import java.lang.reflect.Method;
     32 import java.lang.reflect.Modifier;
     33 
     34 import javax.inject.Inject;
     35 import javax.inject.Singleton;
     36 
     37 import dagger.Subcomponent;
     38 
     39 /**
     40  * Holds a map of root views to FragmentHostStates and generates them as needed.
     41  * Also dispatches the configuration changes to all current FragmentHostStates.
     42  */
     43 @Singleton
     44 public class FragmentService implements ConfigurationChangedReceiver, Dumpable {
     45 
     46     private static final String TAG = "FragmentService";
     47 
     48     private final ArrayMap<View, FragmentHostState> mHosts = new ArrayMap<>();
     49     private final ArrayMap<String, Method> mInjectionMap = new ArrayMap<>();
     50     private final Handler mHandler = new Handler();
     51     private final FragmentCreator mFragmentCreator;
     52 
     53     @Inject
     54     public FragmentService(SystemUIFactory.SystemUIRootComponent rootComponent) {
     55         mFragmentCreator = rootComponent.createFragmentCreator();
     56         initInjectionMap();
     57     }
     58 
     59     ArrayMap<String, Method> getInjectionMap() {
     60         return mInjectionMap;
     61     }
     62 
     63     FragmentCreator getFragmentCreator() {
     64         return mFragmentCreator;
     65     }
     66 
     67     private void initInjectionMap() {
     68         for (Method method : FragmentCreator.class.getDeclaredMethods()) {
     69             if (Fragment.class.isAssignableFrom(method.getReturnType())
     70                     && (method.getModifiers() & Modifier.PUBLIC) != 0) {
     71                 mInjectionMap.put(method.getReturnType().getName(), method);
     72             }
     73         }
     74     }
     75 
     76     public FragmentHostManager getFragmentHostManager(View view) {
     77         View root = view.getRootView();
     78         FragmentHostState state = mHosts.get(root);
     79         if (state == null) {
     80             state = new FragmentHostState(root);
     81             mHosts.put(root, state);
     82         }
     83         return state.getFragmentHostManager();
     84     }
     85 
     86     public void removeAndDestroy(View view) {
     87         final FragmentHostState state = mHosts.remove(view.getRootView());
     88         if (state != null) {
     89             state.mFragmentHostManager.destroy();
     90         }
     91     }
     92 
     93     public void destroyAll() {
     94         for (FragmentHostState state : mHosts.values()) {
     95             state.mFragmentHostManager.destroy();
     96         }
     97     }
     98 
     99     @Override
    100     public void onConfigurationChanged(Configuration newConfig) {
    101         for (FragmentHostState state : mHosts.values()) {
    102             state.sendConfigurationChange(newConfig);
    103         }
    104     }
    105 
    106     @Override
    107     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
    108         pw.println("Dumping fragments:");
    109         for (FragmentHostState state : mHosts.values()) {
    110             state.mFragmentHostManager.getFragmentManager().dump("  ", fd, pw, args);
    111         }
    112     }
    113 
    114     /**
    115      * The subcomponent of dagger that holds all fragments that need injection.
    116      */
    117     @Subcomponent
    118     public interface FragmentCreator {
    119         /**
    120          * Inject a NavigationBarFragment.
    121          */
    122         NavigationBarFragment createNavigationBarFragment();
    123         /**
    124          * Inject a QSFragment.
    125          */
    126         QSFragment createQSFragment();
    127     }
    128 
    129     private class FragmentHostState {
    130         private final View mView;
    131 
    132         private FragmentHostManager mFragmentHostManager;
    133 
    134         public FragmentHostState(View view) {
    135             mView = view;
    136             mFragmentHostManager = new FragmentHostManager(FragmentService.this, mView);
    137         }
    138 
    139         public void sendConfigurationChange(Configuration newConfig) {
    140             mHandler.post(() -> handleSendConfigurationChange(newConfig));
    141         }
    142 
    143         public FragmentHostManager getFragmentHostManager() {
    144             return mFragmentHostManager;
    145         }
    146 
    147         private void handleSendConfigurationChange(Configuration newConfig) {
    148             mFragmentHostManager.onConfigurationChanged(newConfig);
    149         }
    150     }
    151 }
    152