1 /*
2  * Copyright (C) 2017 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.google.android.setupdesign.view;
18 
19 import android.annotation.TargetApi;
20 import android.content.Context;
21 import android.os.Build.VERSION_CODES;
22 import androidx.annotation.Nullable;
23 import android.util.AttributeSet;
24 import android.widget.Checkable;
25 import android.widget.LinearLayout;
26 
27 /**
28  * A LinearLayout which is checkable. This will set the checked state when {@link
29  * #onCreateDrawableState(int)} is called, and can be used with {@code android:duplicateParentState}
30  * to propagate the drawable state to child views.
31  */
32 public class CheckableLinearLayout extends LinearLayout implements Checkable {
33 
34   private boolean checked = false;
35 
CheckableLinearLayout(Context context)36   public CheckableLinearLayout(Context context) {
37     super(context);
38   }
39 
CheckableLinearLayout(Context context, @Nullable AttributeSet attrs)40   public CheckableLinearLayout(Context context, @Nullable AttributeSet attrs) {
41     super(context, attrs);
42   }
43 
44   @TargetApi(VERSION_CODES.HONEYCOMB)
CheckableLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr)45   public CheckableLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
46     super(context, attrs, defStyleAttr);
47   }
48 
49   @TargetApi(VERSION_CODES.LOLLIPOP)
CheckableLinearLayout( Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)50   public CheckableLinearLayout(
51       Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
52     super(context, attrs, defStyleAttr, defStyleRes);
53   }
54 
55   {
56     setFocusable(true);
57   }
58 
59   @Override
onCreateDrawableState(int extraSpace)60   protected int[] onCreateDrawableState(int extraSpace) {
61     if (this.checked) {
62       final int[] superStates = super.onCreateDrawableState(extraSpace + 1);
63       final int[] checked = new int[] {android.R.attr.state_checked};
64       return mergeDrawableStates(superStates, checked);
65     } else {
66       return super.onCreateDrawableState(extraSpace);
67     }
68   }
69 
70   @Override
setChecked(boolean checked)71   public void setChecked(boolean checked) {
72     this.checked = checked;
73     refreshDrawableState();
74   }
75 
76   @Override
isChecked()77   public boolean isChecked() {
78     return checked;
79   }
80 
81   @Override
toggle()82   public void toggle() {
83     setChecked(!isChecked());
84   }
85 }
86