1 /*
2  * Copyright (C) 2018 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.settingslib.notification;
16 
17 import android.content.Context;
18 import android.util.AttributeSet;
19 import android.view.View;
20 import android.view.ViewGroup;
21 import android.widget.LinearLayout;
22 
23 /**
24  * Specialized layout for zen mode that allows the radio buttons to reside within
25  * a RadioGroup, but also makes sure that all the heights of the radio buttons align
26  * with the corresponding content in the second child of this view.
27  */
28 public class ZenRadioLayout extends LinearLayout {
29 
ZenRadioLayout(Context context, AttributeSet attrs)30     public ZenRadioLayout(Context context, AttributeSet attrs) {
31         super(context, attrs);
32     }
33 
34     /**
35      * Run 2 measurement passes, 1 that figures out the size of the content, and another
36      * that sets the size of the radio buttons to the heights of the corresponding content.
37      */
38     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)39     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
40         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
41 
42         ViewGroup radioGroup = (ViewGroup) getChildAt(0);
43         ViewGroup radioContent = (ViewGroup) getChildAt(1);
44         int size = radioGroup.getChildCount();
45         if (size != radioContent.getChildCount()) {
46             throw new IllegalStateException("Expected matching children");
47         }
48         boolean hasChanges = false;
49         View lastView = null;
50         for (int i = 0; i < size; i++) {
51             View radio = radioGroup.getChildAt(i);
52             View content = radioContent.getChildAt(i);
53             if (lastView != null) {
54                 radio.setAccessibilityTraversalAfter(lastView.getId());
55             }
56             View contentClick = findFirstClickable(content);
57             if (contentClick != null) contentClick.setAccessibilityTraversalAfter(radio.getId());
58             lastView = findLastClickable(content);
59             if (radio.getLayoutParams().height != content.getMeasuredHeight()) {
60                 hasChanges = true;
61                 radio.getLayoutParams().height = content.getMeasuredHeight();
62             }
63         }
64         // Measure again if any heights changed.
65         if (hasChanges) {
66             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
67         }
68     }
69 
findFirstClickable(View content)70     private View findFirstClickable(View content) {
71         if (content.isClickable()) return content;
72         if (content instanceof ViewGroup) {
73             ViewGroup group = (ViewGroup) content;
74             for (int i = 0; i < group.getChildCount(); i++) {
75                 View v = findFirstClickable(group.getChildAt(i));
76                 if (v != null) return v;
77             }
78         }
79         return null;
80     }
81 
findLastClickable(View content)82     private View findLastClickable(View content) {
83         if (content.isClickable()) return content;
84         if (content instanceof ViewGroup) {
85             ViewGroup group = (ViewGroup) content;
86             for (int i = group.getChildCount() - 1; i >= 0; i--) {
87                 View v = findLastClickable(group.getChildAt(i));
88                 if (v != null) return v;
89             }
90         }
91         return null;
92     }
93 }
94