content: /*
   * Copyright (C) 2006 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 android.graphics;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.os.Parcel;
  import android.os.Parcelable;
  
  /**
   * An Insets instance holds four integer offsets which describe changes to the four
   * edges of a Rectangle. By convention, positive values move edges towards the
   * centre of the rectangle.
   * <p>
   * Insets are immutable so may be treated as values.
   *
   */
  public final class Insets implements Parcelable {
      public static final @NonNull Insets NONE = new Insets(0, 0, 0, 0);
  
      public final int left;
      public final int top;
      public final int right;
      public final int bottom;
  
      private Insets(int left, int top, int right, int bottom) {
          this.left = left;
          this.top = top;
          this.right = right;
          this.bottom = bottom;
      }
  
      // Factory methods
  
      /**
       * Return an Insets instance with the appropriate values.
       *
       * @param left the left inset
       * @param top the top inset
       * @param right the right inset
       * @param bottom the bottom inset
       *
       * @return Insets instance with the appropriate values
       */
      public static @NonNull Insets of(int left, int top, int right, int bottom) {
          if (left == 0 && top == 0 && right == 0 && bottom == 0) {
              return NONE;
          }
          return new Insets(left, top, right, bottom);
      }
  
      /**
       * Return an Insets instance with the appropriate values.
       *
       * @param r the rectangle from which to take the values
       *
       * @return an Insets instance with the appropriate values
       */
      public static @NonNull Insets of(@Nullable Rect r) {
          return (r == null) ? NONE : of(r.left, r.top, r.right, r.bottom);
      }
  
      /**
       * Returns a Rect instance with the appropriate values.
       *
       * @hide
       */
      public @NonNull Rect toRect() {
          return new Rect(left, top, right, bottom);
      }
  
      /**
       * Add two Insets.
       *
       * @param a The first Insets to add.
       * @param b The second Insets to add.
       * @return a + b, i. e. all insets on every side are added together.
       */
      public static @NonNull Insets add(@NonNull Insets a, @NonNull Insets b) {
          return Insets.of(a.left + b.left, a.top + b.top, a.right + b.right, a.bottom + b.bottom);
      }
  
      /**
       * Subtract two Insets.
       *
       * @param a The minuend.
       * @param b The subtrahend.
       * @return a - b, i. e. all insets on every side are subtracted from each other.
       */
      public static @NonNull Insets subtract(@NonNull Insets a, @NonNull Insets b) {
          return Insets.of(a.left - b.left, a.top - b.top, a.right - b.right, a.bottom - b.bottom);
      }
  
      /**
       * Retrieves the maximum of two Insets.
       *
       * @param a The first Insets.
       * @param b The second Insets.
       * @return max(a, b), i. e. the larger of every inset on every side is taken for the result.
       */
      public static @NonNull Insets max(@NonNull Insets a, @NonNull Insets b) {
          return Insets.of(Math.max(a.left, b.left), Math.max(a.top, b.top),
                  Math.max(a.right, b.right), Math.max(a.bottom, b.bottom));
      }
  
      /**
       * Retrieves the minimum of two Insets.
       *
       * @param a The first Insets.
       * @param b The second Insets.
       * @return min(a, b), i. e. the smaller of every inset on every side is taken for the result.
       */
      public static @NonNull Insets min(@NonNull Insets a, @NonNull Insets b) {
          return Insets.of(Math.min(a.left, b.left), Math.min(a.top, b.top),
                  Math.min(a.right, b.right), Math.min(a.bottom, b.bottom));
      }
  
      /**
       * Two Insets instances are equal iff they belong to the same class and their fields are
       * pairwise equal.
       *
       * @param o the object to compare this instance with.
       *
       * @return true iff this object is equal {@code o}
       */
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          Insets insets = (Insets) o;
  
          if (bottom != insets.bottom) return false;
          if (left != insets.left) return false;
          if (right != insets.right) return false;
          if (top != insets.top) return false;
  
          return true;
      }
  
      @Override
      public int hashCode() {
          int result = left;
          result = 31 * result + top;
          result = 31 * result + right;
          result = 31 * result + bottom;
          return result;
      }
  
      @Override
      public String toString() {
          return "Insets{" +
                  "left=" + left +
                  ", top=" + top +
                  ", right=" + right +
                  ", bottom=" + bottom +
                  '}';
      }
  
      @Override
      public int describeContents() {
          return 0;
      }
  
      @Override
      public void writeToParcel(Parcel out, int flags) {
          out.writeInt(left);
          out.writeInt(top);
          out.writeInt(right);
          out.writeInt(bottom);
      }
  
      public static final @android.annotation.NonNull Parcelable.Creator<Insets> CREATOR = new Parcelable.Creator<Insets>() {
          @Override
          public Insets createFromParcel(Parcel in) {
              return new Insets(in.readInt(), in.readInt(), in.readInt(), in.readInt());
          }
  
          @Override
          public Insets[] newArray(int size) {
              return new Insets[size];
          }
      };
  }
  