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.systemui.volume;
18 
19 import android.content.Context;
20 import android.content.res.Resources;
21 import android.util.ArrayMap;
22 import android.util.TypedValue;
23 import android.view.View;
24 import android.view.View.OnAttachStateChangeListener;
25 import android.widget.TextView;
26 
27 /**
28  * Capture initial sp values for registered textviews, and update properly when configuration
29  * changes.
30  */
31 public class SpTexts {
32 
33     private final Context mContext;
34     private final ArrayMap<TextView, Integer> mTexts = new ArrayMap<>();
35 
SpTexts(Context context)36     public SpTexts(Context context) {
37         mContext = context;
38     }
39 
add(final TextView text)40     public int add(final TextView text) {
41         if (text == null) return 0;
42         final Resources res = mContext.getResources();
43         final float fontScale = res.getConfiguration().fontScale;
44         final float density = res.getDisplayMetrics().density;
45         final float px = text.getTextSize();
46         final int sp = (int)(px / fontScale / density);
47         mTexts.put(text, sp);
48         text.addOnAttachStateChangeListener(new OnAttachStateChangeListener() {
49             @Override
50             public void onViewDetachedFromWindow(View v) {
51             }
52 
53             @Override
54             public void onViewAttachedToWindow(View v) {
55                setTextSizeH(text, sp);
56             }
57         });
58         return sp;
59     }
60 
update()61     public void update() {
62         if (mTexts.isEmpty()) return;
63         mTexts.keyAt(0).post(mUpdateAll);
64     }
65 
setTextSizeH(TextView text, int sp)66     private void setTextSizeH(TextView text, int sp) {
67         text.setTextSize(TypedValue.COMPLEX_UNIT_SP, sp);
68     }
69 
70     private final Runnable mUpdateAll = new Runnable() {
71         @Override
72         public void run() {
73             for (int i = 0; i < mTexts.size(); i++) {
74                 setTextSizeH(mTexts.keyAt(i), mTexts.valueAt(i));
75             }
76         }
77     };
78 }
79