content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.setupwizardlib.view;
  
  import android.annotation.TargetApi;
  import android.content.Context;
  import android.os.Build.VERSION_CODES;
  import androidx.annotation.Nullable;
  import android.util.AttributeSet;
  import android.widget.Checkable;
  import android.widget.LinearLayout;
  
  /**
   * A LinearLayout which is checkable. This will set the checked state when {@link
   * #onCreateDrawableState(int)} is called, and can be used with {@code android:duplicateParentState}
   * to propagate the drawable state to child views.
   */
  public class CheckableLinearLayout extends LinearLayout implements Checkable {
  
    private boolean checked = false;
  
    public CheckableLinearLayout(Context context) {
      super(context);
    }
  
    public CheckableLinearLayout(Context context, @Nullable AttributeSet attrs) {
      super(context, attrs);
    }
  
    @TargetApi(VERSION_CODES.HONEYCOMB)
    public CheckableLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
      super(context, attrs, defStyleAttr);
    }
  
    @TargetApi(VERSION_CODES.LOLLIPOP)
    public CheckableLinearLayout(
        Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
      super(context, attrs, defStyleAttr, defStyleRes);
    }
  
    {
      setFocusable(true);
    }
  
    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
      if (this.checked) {
        final int[] superStates = super.onCreateDrawableState(extraSpace + 1);
        final int[] checked = new int[] {android.R.attr.state_checked};
        return mergeDrawableStates(superStates, checked);
      } else {
        return super.onCreateDrawableState(extraSpace);
      }
    }
  
    @Override
    public void setChecked(boolean checked) {
      this.checked = checked;
      refreshDrawableState();
    }
  
    @Override
    public boolean isChecked() {
      return checked;
    }
  
    @Override
    public void toggle() {
      setChecked(!isChecked());
    }
  }
  