content: /*
   * Copyright (C) 2015 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.content.res.TypedArray;
  import android.graphics.Canvas;
  import android.graphics.drawable.Drawable;
  import android.os.Build;
  import android.os.Build.VERSION_CODES;
  import android.util.AttributeSet;
  import android.view.WindowInsets;
  import android.widget.FrameLayout;
  import com.android.setupwizardlib.R;
  
  /**
   * A FrameLayout subclass that will responds to onApplyWindowInsets to draw a drawable in the top
   * inset area, making a background effect for the navigation bar. To make use of this layout,
   * specify the system UI visibility {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and
   * set specify fitsSystemWindows.
   *
   * <p>This view is a normal FrameLayout if either of those are not set, or if the platform version
   * is lower than Lollipop.
   */
  public class StatusBarBackgroundLayout extends FrameLayout {
  
    private Drawable statusBarBackground;
    private Object lastInsets; // Use generic Object type for compatibility
  
    public StatusBarBackgroundLayout(Context context) {
      super(context);
      init(context, null, 0);
    }
  
    public StatusBarBackgroundLayout(Context context, AttributeSet attrs) {
      super(context, attrs);
      init(context, attrs, 0);
    }
  
    @TargetApi(VERSION_CODES.HONEYCOMB)
    public StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr) {
      super(context, attrs, defStyleAttr);
      init(context, attrs, defStyleAttr);
    }
  
    private void init(Context context, AttributeSet attrs, int defStyleAttr) {
      final TypedArray a =
          context.obtainStyledAttributes(
              attrs, R.styleable.SuwStatusBarBackgroundLayout, defStyleAttr, 0);
      final Drawable statusBarBackground =
          a.getDrawable(R.styleable.SuwStatusBarBackgroundLayout_suwStatusBarBackground);
      setStatusBarBackground(statusBarBackground);
      a.recycle();
    }
  
    @Override
    protected void onAttachedToWindow() {
      super.onAttachedToWindow();
      if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
        if (lastInsets == null) {
          requestApplyInsets();
        }
      }
    }
  
    @Override
    protected void onDraw(Canvas canvas) {
      super.onDraw(canvas);
      if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
        if (lastInsets != null) {
          final int insetTop = ((WindowInsets) lastInsets).getSystemWindowInsetTop();
          if (insetTop > 0) {
            statusBarBackground.setBounds(0, 0, getWidth(), insetTop);
            statusBarBackground.draw(canvas);
          }
        }
      }
    }
  
    public void setStatusBarBackground(Drawable background) {
      statusBarBackground = background;
      if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
        setWillNotDraw(background == null);
        setFitsSystemWindows(background != null);
        invalidate();
      }
    }
  
    public Drawable getStatusBarBackground() {
      return statusBarBackground;
    }
  
    @Override
    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
      lastInsets = insets;
      return super.onApplyWindowInsets(insets);
    }
  }
  