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      1 /*
      2  * Copyright (C) 2015 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.packageinstaller.permission.ui.television;
     18 
     19 import android.os.Bundle;
     20 import android.support.annotation.Nullable;
     21 import android.support.v14.preference.PreferenceFragment;
     22 import android.support.v17.leanback.widget.VerticalGridView;
     23 import android.support.v7.preference.PreferenceScreen;
     24 import android.support.v7.widget.RecyclerView;
     25 import android.view.LayoutInflater;
     26 import android.view.View;
     27 import android.view.ViewGroup;
     28 import android.view.animation.Animation;
     29 import android.view.animation.Animation.AnimationListener;
     30 import android.view.animation.AnimationUtils;
     31 import android.widget.TextView;
     32 
     33 import com.android.packageinstaller.R;
     34 
     35 public abstract class PermissionsFrameFragment extends PreferenceFragment {
     36 
     37     // Key identifying the preference used on TV as the extra header in a permission fragment.
     38     // This is to distinguish it from the rest of the preferences
     39     protected static final String HEADER_PREFERENCE_KEY = "HeaderPreferenceKey";
     40 
     41     private ViewGroup mPreferencesContainer;
     42 
     43     // TV-specific instance variable
     44     @Nullable private RecyclerView mGridView;
     45 
     46     private View mLoadingView;
     47     private ViewGroup mPrefsView;
     48     private boolean mIsLoading;
     49 
     50     /**
     51      * Returns the view group that holds the preferences objects. This will
     52      * only be set after {@link #onCreateView} has been called.
     53      */
     54     protected final ViewGroup getPreferencesContainer() {
     55         return mPreferencesContainer;
     56     }
     57 
     58     @Override
     59     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     60             Bundle savedInstanceState) {
     61         ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.permissions_frame, container,
     62                         false);
     63         mPrefsView = (ViewGroup) rootView.findViewById(R.id.prefs_container);
     64         if (mPrefsView == null) {
     65             mPrefsView = rootView;
     66         }
     67         mLoadingView = rootView.findViewById(R.id.loading_container);
     68         mPreferencesContainer = (ViewGroup) super.onCreateView(
     69                 inflater, mPrefsView, savedInstanceState);
     70         setLoading(mIsLoading, false, true /* force */);
     71         mPrefsView.addView(mPreferencesContainer);
     72         return rootView;
     73     }
     74 
     75     @Override
     76     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
     77         PreferenceScreen preferences = getPreferenceScreen();
     78         if (preferences == null) {
     79             preferences = getPreferenceManager().createPreferenceScreen(getActivity());
     80             setPreferenceScreen(preferences);
     81         }
     82     }
     83 
     84     protected void setLoading(boolean loading, boolean animate) {
     85         setLoading(loading, animate, false);
     86     }
     87 
     88     private void setLoading(boolean loading, boolean animate, boolean force) {
     89         if (mIsLoading != loading || force) {
     90             mIsLoading = loading;
     91             if (getView() == null) {
     92                 // If there is no created view, there is no reason to animate.
     93                 animate = false;
     94             }
     95             if (mPrefsView != null) {
     96                 setViewShown(mPrefsView, !loading, animate);
     97             }
     98             if (mLoadingView != null) {
     99                 setViewShown(mLoadingView, loading, animate);
    100             }
    101         }
    102     }
    103 
    104     private void setViewShown(final View view, boolean shown, boolean animate) {
    105         if (animate) {
    106             Animation animation = AnimationUtils.loadAnimation(getContext(),
    107                     shown ? android.R.anim.fade_in : android.R.anim.fade_out);
    108             if (shown) {
    109                 view.setVisibility(View.VISIBLE);
    110             } else {
    111                 animation.setAnimationListener(new AnimationListener() {
    112                     @Override
    113                     public void onAnimationStart(Animation animation) {
    114                     }
    115 
    116                     @Override
    117                     public void onAnimationRepeat(Animation animation) {
    118                     }
    119 
    120                     @Override
    121                     public void onAnimationEnd(Animation animation) {
    122                         view.setVisibility(View.INVISIBLE);
    123                     }
    124                 });
    125             }
    126             view.startAnimation(animation);
    127         } else {
    128             view.clearAnimation();
    129             view.setVisibility(shown ? View.VISIBLE : View.INVISIBLE);
    130         }
    131     }
    132 
    133     @Override
    134     public RecyclerView onCreateRecyclerView(LayoutInflater inflater, ViewGroup parent,
    135                                              Bundle savedInstanceState) {
    136         VerticalGridView verticalGridView = (VerticalGridView) inflater.inflate(
    137                 R.layout.leanback_preferences_list, parent, false);
    138         verticalGridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_BOTH_EDGE);
    139         verticalGridView.setFocusScrollStrategy(VerticalGridView.FOCUS_SCROLL_ALIGNED);
    140         mGridView = verticalGridView;
    141         return mGridView;
    142     }
    143 
    144     @Override
    145     protected RecyclerView.Adapter<?> onCreateAdapter(PreferenceScreen preferenceScreen) {
    146         final RecyclerView.Adapter<?> adapter = super.onCreateAdapter(preferenceScreen);
    147 
    148         if (adapter != null) {
    149             final TextView emptyView = (TextView) getView().findViewById(R.id.no_permissions);
    150             onSetEmptyText(emptyView);
    151             final RecyclerView recyclerView = getListView();
    152             adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
    153                 @Override
    154                 public void onChanged() {
    155                     checkEmpty();
    156                 }
    157 
    158                 @Override
    159                 public void onItemRangeInserted(int positionStart, int itemCount) {
    160                     checkEmpty();
    161                 }
    162 
    163                 @Override
    164                 public void onItemRangeRemoved(int positionStart, int itemCount) {
    165                     checkEmpty();
    166                 }
    167 
    168                 private void checkEmpty() {
    169                     boolean isEmpty = isPreferenceListEmpty();
    170                     emptyView.setVisibility(isEmpty ? View.VISIBLE : View.GONE);
    171                     recyclerView.setVisibility(isEmpty && adapter.getItemCount() == 0 ?
    172                             View.GONE : View.VISIBLE);
    173                     if (!isEmpty && mGridView != null) {
    174                         mGridView.requestFocus();
    175                     }
    176                 }
    177             });
    178 
    179             boolean isEmpty = isPreferenceListEmpty();
    180             emptyView.setVisibility(isEmpty ? View.VISIBLE : View.GONE);
    181             recyclerView.setVisibility(isEmpty && adapter.getItemCount() == 0 ?
    182                     View.GONE : View.VISIBLE);
    183             if (!isEmpty && mGridView != null) {
    184                 mGridView.requestFocus();
    185             }
    186         }
    187 
    188         return adapter;
    189     }
    190 
    191     private boolean isPreferenceListEmpty() {
    192         PreferenceScreen screen = getPreferenceScreen();
    193         return screen.getPreferenceCount() == 0 || (
    194                 screen.getPreferenceCount() == 1 &&
    195                         (screen.findPreference(HEADER_PREFERENCE_KEY) != null));
    196     }
    197 
    198     /**
    199      * Hook for subclasses to change the default text of the empty view.
    200      * Base implementation leaves the default empty view text.
    201      *
    202      * @param textView the empty text view
    203      */
    204     protected void onSetEmptyText(TextView textView) {
    205     }
    206 }
    207