content: /*
   * Copyright (C) 2018 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.layoutlib.bridge.impl;
  
  import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.graphics.Path;
  import android.graphics.Rect;
  import android.graphics.Region;
  import android.view.DisplayCutout;
  import android.view.DisplayInfo;
  import android.view.Gravity;
  import android.view.View;
  
  class DisplayCutoutView extends View {
  
      private final DisplayInfo mInfo = new DisplayInfo();
      private final Paint mPaint = new Paint();
      private final Region mBounds = new Region();
      private final Rect mBoundingRect = new Rect();
      private final Path mBoundingPath = new Path();
      private final int[] mLocation = new int[2];
      private final boolean mStart;
  
      public DisplayCutoutView(Context context, boolean start) {
          super(context);
          mStart = start;
      }
  
      @Override
      protected void onAttachedToWindow() {
          super.onAttachedToWindow();
          update();
      }
  
      @Override
      protected void onDetachedFromWindow() {
          super.onDetachedFromWindow();
      }
  
      @Override
      protected void onDraw(Canvas canvas) {
          super.onDraw(canvas);
          getLocationOnScreen(mLocation);
          canvas.translate(-mLocation[0], -mLocation[1]);
          if (!mBoundingPath.isEmpty()) {
              mPaint.setColor(Color.BLACK);
              mPaint.setStyle(Paint.Style.FILL);
              canvas.drawPath(mBoundingPath, mPaint);
          }
      }
  
      private void update() {
          requestLayout();
          getDisplay().getDisplayInfo(mInfo);
          mBounds.setEmpty();
          mBoundingRect.setEmpty();
          mBoundingPath.reset();
          int newVisible;
          if (hasCutout()) {
              mBounds.set(mInfo.displayCutout.getBoundingRectTop());
              localBounds(mBoundingRect);
              mBounds.getBoundaryPath(mBoundingPath);
              newVisible = VISIBLE;
          } else {
              newVisible = GONE;
          }
          if (newVisible != getVisibility()) {
              setVisibility(newVisible);
          }
      }
  
      private boolean hasCutout() {
          final DisplayCutout displayCutout = mInfo.displayCutout;
          if (displayCutout == null) {
              return false;
          }
          if (mStart) {
              return displayCutout.getSafeInsetLeft() > 0
                      || displayCutout.getSafeInsetTop() > 0;
          } else {
              return displayCutout.getSafeInsetRight() > 0
                      || displayCutout.getSafeInsetBottom() > 0;
          }
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          if (mBounds.isEmpty()) {
              super.onMeasure(widthMeasureSpec, heightMeasureSpec);
              return;
          }
          setMeasuredDimension(
                  resolveSizeAndState(mBoundingRect.width(), widthMeasureSpec, 0),
                  resolveSizeAndState(mBoundingRect.height(), heightMeasureSpec, 0));
      }
  
      public static void boundsFromDirection(DisplayCutout displayCutout, int gravity, Rect out) {
          Region bounds = new Region(displayCutout.getBoundingRectTop());
          switch (gravity) {
              case Gravity.TOP:
                  bounds.op(0, 0, Integer.MAX_VALUE, displayCutout.getSafeInsetTop(),
                          Region.Op.INTERSECT);
                  out.set(bounds.getBounds());
                  break;
              case Gravity.LEFT:
                  bounds.op(0, 0, displayCutout.getSafeInsetLeft(), Integer.MAX_VALUE,
                          Region.Op.INTERSECT);
                  out.set(bounds.getBounds());
                  break;
              case Gravity.BOTTOM:
                  bounds.op(0, displayCutout.getSafeInsetTop() + 1, Integer.MAX_VALUE,
                          Integer.MAX_VALUE, Region.Op.INTERSECT);
                  out.set(bounds.getBounds());
                  break;
              case Gravity.RIGHT:
                  bounds.op(displayCutout.getSafeInsetLeft() + 1, 0, Integer.MAX_VALUE,
                          Integer.MAX_VALUE, Region.Op.INTERSECT);
                  out.set(bounds.getBounds());
                  break;
          }
          bounds.recycle();
      }
  
      private void localBounds(Rect out) {
          final DisplayCutout displayCutout = mInfo.displayCutout;
  
          if (mStart) {
              if (displayCutout.getSafeInsetLeft() > 0) {
                  boundsFromDirection(displayCutout, Gravity.LEFT, out);
              } else if (displayCutout.getSafeInsetTop() > 0) {
                  boundsFromDirection(displayCutout, Gravity.TOP, out);
              }
          } else {
              if (displayCutout.getSafeInsetRight() > 0) {
                  boundsFromDirection(displayCutout, Gravity.RIGHT, out);
              } else if (displayCutout.getSafeInsetBottom() > 0) {
                  boundsFromDirection(displayCutout, Gravity.BOTTOM, out);
              }
          }
      }
  }