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;
16 
17 import android.annotation.Nullable;
18 import android.content.Context;
19 import android.content.pm.ActivityInfo;
20 import android.content.res.Configuration;
21 import android.content.res.TypedArray;
22 import android.util.AttributeSet;
23 import android.view.LayoutInflater;
24 import android.view.View;
25 import android.widget.FrameLayout;
26 
27 import com.android.systemui.res.R;
28 
29 import java.util.ArrayList;
30 import java.util.List;
31 import java.util.Set;
32 
33 /**
34  * Custom {@link FrameLayout} that re-inflates when changes to {@link Configuration} happen.
35  * Currently supports changes to density, asset path, and locale.
36  */
37 public class AutoReinflateContainer extends FrameLayout {
38 
39     private static final Set<Integer> SUPPORTED_CHANGES = Set.of(
40             ActivityInfo.CONFIG_LOCALE,
41             ActivityInfo.CONFIG_UI_MODE,
42             ActivityInfo.CONFIG_ASSETS_PATHS,
43             ActivityInfo.CONFIG_DENSITY,
44             ActivityInfo.CONFIG_FONT_SCALE
45     );
46 
47     private final List<InflateListener> mInflateListeners = new ArrayList<>();
48     private final int mLayout;
49 
50     private final Configuration mLastConfig = new Configuration();
51 
AutoReinflateContainer(Context context, @Nullable AttributeSet attrs)52     public AutoReinflateContainer(Context context, @Nullable AttributeSet attrs) {
53         super(context, attrs);
54 
55         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoReinflateContainer);
56         if (!a.hasValue(R.styleable.AutoReinflateContainer_android_layout)) {
57             throw new IllegalArgumentException("AutoReinflateContainer must contain a layout");
58         }
59         mLayout = a.getResourceId(R.styleable.AutoReinflateContainer_android_layout, 0);
60         a.recycle();
61         inflateLayout();
62     }
63 
64     @Override
onConfigurationChanged(Configuration newConfig)65     protected void onConfigurationChanged(Configuration newConfig) {
66         int diff = mLastConfig.updateFrom(newConfig);
67         for (int change: SUPPORTED_CHANGES) {
68             if ((diff & change) != 0) {
69                 inflateLayout();
70                 return;
71             }
72         }
73     }
74 
inflateLayoutImpl()75     protected void inflateLayoutImpl() {
76         LayoutInflater.from(getContext()).inflate(mLayout, this);
77     }
78 
inflateLayout()79     public void inflateLayout() {
80         removeAllViews();
81         inflateLayoutImpl();
82         final int N = mInflateListeners.size();
83         for (int i = 0; i < N; i++) {
84             mInflateListeners.get(i).onInflated(getChildAt(0));
85         }
86     }
87 
addInflateListener(InflateListener listener)88     public void addInflateListener(InflateListener listener) {
89         mInflateListeners.add(listener);
90         listener.onInflated(getChildAt(0));
91     }
92 
93     public interface InflateListener {
94         /**
95          * Called whenever a new view is inflated.
96          */
onInflated(View v)97         void onInflated(View v);
98     }
99 }
100