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