content: package androidx.constraintlayout.validation;
  
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.Rect;
  import android.graphics.drawable.Drawable;
  import android.os.Build;
  import android.support.constraintlayout.validation.R;
  import android.util.AttributeSet;
  import android.view.Gravity;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.WindowInsets;
  import android.widget.FrameLayout;
  
  import androidx.annotation.IntDef;
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  import androidx.annotation.RequiresApi;
  import androidx.annotation.RestrictTo;
  import androidx.annotation.StyleRes;
  import androidx.annotation.UiThread;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  
  /**
   * Copy of wear's BoxInsetLayout forcing a round screen to capture bug b/136738279
   *
   * BoxInsetLayout is a screen shape-aware ViewGroup that can box its children in the center
   * square of a round screen by using the {@code boxedEdges} attribute. The values for this attribute
   * specify the child's edges to be boxed in: {@code left|top|right|bottom} or {@code all}. The
   * {@code boxedEdges} attribute is ignored on a device with a rectangular screen.
   */
  @UiThread
  public class RoundBoxInsetLayout extends ViewGroup {
      private static final float FACTOR = 0.146467f; //(1 - sqrt(2)/2)/2
      private static final int DEFAULT_CHILD_GRAVITY = Gravity.TOP | Gravity.START;
      private final int mScreenHeight;
      private final int mScreenWidth;
      private boolean mIsRound;
      private Rect mForegroundPadding;
      private Rect mInsets;
      private Drawable mForegroundDrawable;
      /**
       * Simple constructor to use when creating a view from code.
       *
       * @param context The {@link Context} the view is running in, through which it can access
       *                the current theme, resources, etc.
       */
      public RoundBoxInsetLayout(@NonNull Context context) {
          this(context, null);
      }
      /**
       * Constructor that is called when inflating a view from XML. This is called when a view is
       * being constructed from an XML file, supplying attributes that were specified in the XML
       * file. This version uses a default style of 0, so the only attribute values applied are those
       * in the Context's Theme and the given AttributeSet.
       * <p>
       * <p>
       * The method onFinishInflate() will be called after all children have been added.
       *
       * @param context The {@link Context} the view is running in, through which it can access
       *                the current theme, resources, etc.
       * @param attrs   The attributes of the XML tag that is inflating the view.
       */
      public RoundBoxInsetLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
          this(context, attrs, 0);
      }
      /**
       * Perform inflation from XML and apply a class-specific base style from a theme attribute.
       * This constructor allows subclasses to use their own base style when they are inflating.
       *
       * @param context  The {@link Context} the view is running in, through which it can
       *                 access the current theme, resources, etc.
       * @param attrs    The attributes of the XML tag that is inflating the view.
       * @param defStyle An attribute in the current theme that contains a reference to a style
       *                 resource that supplies default values for the view. Can be 0 to not look for
       *                 defaults.
       */
      public RoundBoxInsetLayout(@NonNull Context context, @Nullable AttributeSet attrs, @StyleRes int
              defStyle) {
          super(context, attrs, defStyle);
          // make sure we have a foreground padding object
          if (mForegroundPadding == null) {
              mForegroundPadding = new Rect();
          }
          if (mInsets == null) {
              mInsets = new Rect();
          }
           mScreenHeight = Resources.getSystem().getDisplayMetrics().heightPixels;
           mScreenWidth = Resources.getSystem().getDisplayMetrics().widthPixels;
      }
      @RequiresApi(api = Build.VERSION_CODES.KITKAT_WATCH)
      @Override
      public WindowInsets onApplyWindowInsets(WindowInsets insets) {
          insets = super.onApplyWindowInsets(insets);
          if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
              final boolean round = insets.isRound();
              if (round != mIsRound) {
                  mIsRound = round;
                  requestLayout();
              }
              mInsets.set(insets.getSystemWindowInsetLeft(), insets.getSystemWindowInsetTop(),
                      insets.getSystemWindowInsetRight(), insets.getSystemWindowInsetBottom());
          }
          return insets;
      }
      @Override
      public void setForeground(Drawable drawable) {
          super.setForeground(drawable);
          mForegroundDrawable = drawable;
          if (mForegroundPadding == null) {
              mForegroundPadding = new Rect();
          }
          if (mForegroundDrawable != null) {
              drawable.getPadding(mForegroundPadding);
          }
      }
      @Override
      public LayoutParams generateLayoutParams(AttributeSet attrs) {
          return new RoundBoxInsetLayout.LayoutParams(getContext(), attrs);
      }
      @RequiresApi(api = Build.VERSION_CODES.KITKAT_WATCH)
      @Override
      protected void onAttachedToWindow() {
          super.onAttachedToWindow();
          if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
              requestApplyInsets();
          } else {
              mIsRound = getResources().getConfiguration().isScreenRound();
              // mIsRound = getWidth() == getHeight(); // force to round
              if (!mIsRound) {
                  ViewGroup parent = (ViewGroup) getParent();
                  mIsRound = parent.getWidth() == parent.getHeight();
              }
              WindowInsets insets = getRootWindowInsets();
              mInsets.set(insets.getSystemWindowInsetLeft(), insets.getSystemWindowInsetTop(),
                      insets.getSystemWindowInsetRight(), insets.getSystemWindowInsetBottom());
          }
      }
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          int count = getChildCount();
          // find max size
          int maxWidth = 0;
          int maxHeight = 0;
          int childState = 0;
          for (int i = 0; i < count; i++) {
              final View child = getChildAt(i);
              if (child.getVisibility() != GONE) {
                  LayoutParams lp = (RoundBoxInsetLayout.LayoutParams) child.getLayoutParams();
                  int marginLeft = 0;
                  int marginRight = 0;
                  int marginTop = 0;
                  int marginBottom = 0;
                  if (mIsRound) {
                      // round screen, check boxed, don't use margins on boxed
                      if ((lp.boxedEdges & LayoutParams.BOX_LEFT) == 0) {
                          marginLeft = lp.leftMargin;
                      }
                      if ((lp.boxedEdges & LayoutParams.BOX_RIGHT) == 0) {
                          marginRight = lp.rightMargin;
                      }
                      if ((lp.boxedEdges & LayoutParams.BOX_TOP) == 0) {
                          marginTop = lp.topMargin;
                      }
                      if ((lp.boxedEdges & LayoutParams.BOX_BOTTOM) == 0) {
                          marginBottom = lp.bottomMargin;
                      }
                  } else {
                      // rectangular, ignore boxed, use margins
                      marginLeft = lp.leftMargin;
                      marginTop = lp.topMargin;
                      marginRight = lp.rightMargin;
                      marginBottom = lp.bottomMargin;
                  }
                  measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0);
                  maxWidth = Math.max(maxWidth, child.getMeasuredWidth() + marginLeft + marginRight);
                  maxHeight = Math.max(maxHeight,
                          child.getMeasuredHeight() + marginTop + marginBottom);
                  childState = combineMeasuredStates(childState, child.getMeasuredState());
              }
          }
          // Account for padding too
          maxWidth += getPaddingLeft() + mForegroundPadding.left + getPaddingRight()
                  + mForegroundPadding.right;
          maxHeight += getPaddingTop() + mForegroundPadding.top + getPaddingBottom()
                  + mForegroundPadding.bottom;
          // Check against our minimum height and width
          maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
          maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
          // Check against our foreground's minimum height and width
          if (mForegroundDrawable != null) {
              maxHeight = Math.max(maxHeight, mForegroundDrawable.getMinimumHeight());
              maxWidth = Math.max(maxWidth, mForegroundDrawable.getMinimumWidth());
          }
          int measuredWidth = resolveSizeAndState(maxWidth, widthMeasureSpec, childState);
          int measuredHeight = resolveSizeAndState(maxHeight, heightMeasureSpec,
                  childState << MEASURED_HEIGHT_STATE_SHIFT);
          setMeasuredDimension(measuredWidth, measuredHeight);
          // determine boxed inset
          int boxInset = calculateInset(measuredWidth, measuredHeight);
          // adjust the the children measures, if necessary
          for (int i = 0; i < count; i++) {
              measureChild(widthMeasureSpec, heightMeasureSpec, boxInset, i);
          }
      }
      @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
      @Override
      protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
          final int count = getChildCount();
          final int parentLeft = getPaddingLeft() + mForegroundPadding.left;
          final int parentRight = right - left - getPaddingRight() - mForegroundPadding.right;
          final int parentTop = getPaddingTop() + mForegroundPadding.top;
          final int parentBottom = bottom - top - getPaddingBottom() - mForegroundPadding.bottom;
          for (int i = 0; i < count; i++) {
              final View child = getChildAt(i);
              if (child.getVisibility() != GONE) {
                  final LayoutParams lp = (LayoutParams) child.getLayoutParams();
                  final int width = child.getMeasuredWidth();
                  final int height = child.getMeasuredHeight();
                  int childLeft;
                  int childTop;
                  int gravity = lp.gravity;
                  if (gravity == -1) {
                      gravity = DEFAULT_CHILD_GRAVITY;
                  }
                  final int layoutDirection = getLayoutDirection();
                  final int absoluteGravity = Gravity.getAbsoluteGravity(gravity, layoutDirection);
                  final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;
                  final int horizontalGravity = gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
                  int desiredInset = calculateInset(getMeasuredWidth(), getMeasuredHeight());
                  // If the child's width is match_parent then we can ignore gravity.
                  int leftChildMargin = calculateChildLeftMargin(lp, horizontalGravity, desiredInset);
                  int rightChildMargin = calculateChildRightMargin(lp, horizontalGravity,
                          desiredInset);
                  if (lp.width == LayoutParams.MATCH_PARENT) {
                      childLeft = parentLeft + leftChildMargin;
                  } else {
                      switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
                          case Gravity.CENTER_HORIZONTAL:
                              childLeft = parentLeft + (parentRight - parentLeft - width) / 2
                                      + leftChildMargin - rightChildMargin;
                              break;
                          case Gravity.RIGHT:
                              childLeft = parentRight - width - rightChildMargin;
                              break;
                          case Gravity.LEFT:
                          default:
                              childLeft = parentLeft + leftChildMargin;
                      }
                  }
                  // If the child's height is match_parent then we can ignore gravity.
                  int topChildMargin = calculateChildTopMargin(lp, verticalGravity, desiredInset);
                  int bottomChildMargin = calculateChildBottomMargin(lp, verticalGravity,
                          desiredInset);
                  if (lp.height == LayoutParams.MATCH_PARENT) {
                      childTop = parentTop + topChildMargin;
                  } else {
                      switch (verticalGravity) {
                          case Gravity.CENTER_VERTICAL:
                              childTop = parentTop + (parentBottom - parentTop - height) / 2
                                      + topChildMargin - bottomChildMargin;
                              break;
                          case Gravity.BOTTOM:
                              childTop = parentBottom - height - bottomChildMargin;
                              break;
                          case Gravity.TOP:
                          default:
                              childTop = parentTop + topChildMargin;
                      }
                  }
                  child.layout(childLeft, childTop, childLeft + width, childTop + height);
              }
          }
      }
      @Override
      protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
          return p instanceof LayoutParams;
      }
      @Override
      protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
          return new LayoutParams(p);
      }
      private void measureChild(int widthMeasureSpec, int heightMeasureSpec, int desiredMinInset,
                                int i) {
          final View child = getChildAt(i);
          final LayoutParams childLayoutParams = (LayoutParams) child.getLayoutParams();
          int gravity = childLayoutParams.gravity;
          if (gravity == -1) {
              gravity = DEFAULT_CHILD_GRAVITY;
          }
          final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;
          final int horizontalGravity = gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
          int childWidthMeasureSpec;
          int childHeightMeasureSpec;
          int leftParentPadding = getPaddingLeft() + mForegroundPadding.left;
          int rightParentPadding = getPaddingRight() + mForegroundPadding.right;
          int topParentPadding = getPaddingTop() + mForegroundPadding.top;
          int bottomParentPadding = getPaddingBottom() + mForegroundPadding.bottom;
          // adjust width
          int totalWidthMargin = leftParentPadding + rightParentPadding + calculateChildLeftMargin(
                  childLayoutParams, horizontalGravity, desiredMinInset) + calculateChildRightMargin(
                  childLayoutParams, horizontalGravity, desiredMinInset);
          // adjust height
          int totalHeightMargin = topParentPadding + bottomParentPadding + calculateChildTopMargin(
                  childLayoutParams, verticalGravity, desiredMinInset) + calculateChildBottomMargin(
                  childLayoutParams, verticalGravity, desiredMinInset);
          childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, totalWidthMargin,
                  childLayoutParams.width);
          childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, totalHeightMargin,
                  childLayoutParams.height);
          int maxAllowedWidth = getMeasuredWidth() - totalWidthMargin;
          int maxAllowedHeight = getMeasuredHeight() - totalHeightMargin;
          if (child.getMeasuredWidth() > maxAllowedWidth
                  || child.getMeasuredHeight() > maxAllowedHeight) {
              child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
          }
      }
      private int calculateChildLeftMargin(LayoutParams lp, int horizontalGravity, int
              desiredMinInset) {
          if (mIsRound && ((lp.boxedEdges & LayoutParams.BOX_LEFT) != 0)) {
              if (lp.width == LayoutParams.MATCH_PARENT || horizontalGravity == Gravity.LEFT) {
                  return lp.leftMargin + desiredMinInset;
              }
          }
          return lp.leftMargin;
      }
      private int calculateChildRightMargin(LayoutParams lp, int horizontalGravity, int
              desiredMinInset) {
          if (mIsRound && ((lp.boxedEdges & LayoutParams.BOX_RIGHT) != 0)) {
              if (lp.width == LayoutParams.MATCH_PARENT || horizontalGravity == Gravity.RIGHT) {
                  return lp.rightMargin + desiredMinInset;
              }
          }
          return lp.rightMargin;
      }
      private int calculateChildTopMargin(LayoutParams lp, int verticalGravity, int desiredMinInset) {
          if (mIsRound && ((lp.boxedEdges & LayoutParams.BOX_TOP) != 0)) {
              if (lp.height == LayoutParams.MATCH_PARENT || verticalGravity == Gravity.TOP) {
                  return lp.topMargin + desiredMinInset;
              }
          }
          return lp.topMargin;
      }
      private int calculateChildBottomMargin(LayoutParams lp, int verticalGravity, int
              desiredMinInset) {
          if (mIsRound && ((lp.boxedEdges & LayoutParams.BOX_BOTTOM) != 0)) {
              if (lp.height == LayoutParams.MATCH_PARENT || verticalGravity == Gravity.BOTTOM) {
                  return lp.bottomMargin + desiredMinInset;
              }
          }
          return lp.bottomMargin;
      }
      private int calculateInset(int measuredWidth, int measuredHeight) {
          int rightEdge = Math.min(measuredWidth, mScreenWidth);
          int bottomEdge = Math.min(measuredHeight, mScreenHeight);
          return (int) (FACTOR * Math.max(rightEdge, bottomEdge));
      }
      /**
       * Per-child layout information for layouts that support margins, gravity and boxedEdges.
       * See {@link R.styleable#BoxInsetLayout_Layout BoxInsetLayout Layout Attributes} for a list
       * of all child view attributes that this class supports.
       *
       * @attr ref R.styleable#BoxInsetLayout_Layout_boxedEdges
       */
      public static class LayoutParams extends FrameLayout.LayoutParams {
          /** @DoNotShow */
          @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
          @IntDef({BOX_NONE, BOX_LEFT, BOX_TOP, BOX_RIGHT, BOX_BOTTOM, BOX_ALL})
          @Retention(RetentionPolicy.SOURCE)
          public @interface BoxedEdges {}
          /** Default boxing setting. There are no insets forced on the child views. */
          public static final int BOX_NONE = 0x0;
          /** The view will force an inset on the left edge of the children. */
          public static final int BOX_LEFT = 0x01;
          /** The view will force an inset on the top edge of the children. */
          public static final int BOX_TOP = 0x02;
          /** The view will force an inset on the right edge of the children. */
          public static final int BOX_RIGHT = 0x04;
          /** The view will force an inset on the bottom edge of the children. */
          public static final int BOX_BOTTOM = 0x08;
          /** The view will force an inset on all of the edges of the children. */
          public static final int BOX_ALL = 0x0F;
          /** Specifies the screen-specific insets for each of the child edges. */
          @BoxedEdges
          public int boxedEdges = BOX_NONE;
          /**
           * Creates a new set of layout parameters. The values are extracted from the supplied
           * attributes set and context.
           *
           * @param context the application environment
           * @param attrs the set of attributes from which to extract the layout parameters' values
           */
          @SuppressWarnings("ResourceType")
          public LayoutParams(@NonNull Context context, @Nullable AttributeSet attrs) {
              super(context, attrs);
  //            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.BoxInsetLayout_Layout,
  //                    0, 0);
  //            boxedEdges = a.getInt(R.styleable.BoxInsetLayout_Layout_boxedEdges, BOX_NONE);
  //            a.recycle();
              boxedEdges = BOX_ALL;
          }
          /**
           * Creates a new set of layout parameters with the specified width and height.
           *
           * @param width the width, either {@link #MATCH_PARENT},
           *              {@link #WRAP_CONTENT} or a fixed size in pixels
           * @param height the height, either {@link #MATCH_PARENT},
           *               {@link #WRAP_CONTENT} or a fixed size in pixelsy
           */
          public LayoutParams(int width, int height) {
              super(width, height);
          }
          /**
           * Creates a new set of layout parameters with the specified width, height
           * and gravity.
           *
           * @param width the width, either {@link #MATCH_PARENT},
           *              {@link #WRAP_CONTENT} or a fixed size in pixels
           * @param height the height, either {@link #MATCH_PARENT},
           *               {@link #WRAP_CONTENT} or a fixed size in pixels
           * @param gravity the gravity
           *
           * @see android.view.Gravity
           */
          public LayoutParams(int width, int height, int gravity) {
              super(width, height, gravity);
          }
          public LayoutParams(int width, int height, int gravity, @BoxedEdges int boxed) {
              super(width, height, gravity);
              boxedEdges = boxed;
          }
          /**
           * Copy constructor. Clones the width and height of the source.
           *
           * @param source The layout params to copy from.
           */
          public LayoutParams(@NonNull ViewGroup.LayoutParams source) {
              super(source);
          }
          /**
           * Copy constructor. Clones the width, height and margin values.
           *
           * @param source The layout params to copy from.
           */
          public LayoutParams(@NonNull ViewGroup.MarginLayoutParams source) {
              super(source);
          }
          /**
           * Copy constructor. Clones the width, height, margin values, and
           * gravity of the source.
           *
           * @param source The layout params to copy from.
           */
          @RequiresApi(api = Build.VERSION_CODES.KITKAT)
          public LayoutParams(@NonNull FrameLayout.LayoutParams source) {
              super(source);
          }
          /**
           * Copy constructor. Clones the width, height, margin values, boxedEdges and
           * gravity of the source.
           *
           * @param source The layout params to copy from.
           */
          @RequiresApi(api = Build.VERSION_CODES.KITKAT)
          public LayoutParams(@NonNull LayoutParams source) {
              super(source);
              this.boxedEdges = source.boxedEdges;
              this.gravity = source.gravity;
          }
      }
  }