/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The XAMJ Project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
package org.lobobrowser.html.renderer;

class ShiftedFloatingBounds implements FloatingBounds {
  private final FloatingBounds prevBounds;
  private final int shiftLeft;
  private final int shiftRight;
  private final int shiftY;

  /**
   * Constructs the ShiftedFloatingBounds. Floatinb bounds moved up the
   * hierarchy of renderables will generally have positive shifts.
   *
   * @param prevBounds
   *          The baseline floating bounds.
   * @param shiftX
   *          How much the original bounds have shifted in the X axis.
   * @param shiftY
   *          How much the original bounds have shifted in the Y axis.
   */
  public ShiftedFloatingBounds(final FloatingBounds prevBounds, final int shiftLeft, final int shiftRight, final int shiftY) {
    super();
    this.prevBounds = prevBounds;
    this.shiftLeft = shiftLeft;
    this.shiftRight = shiftRight;
    this.shiftY = shiftY;
  }

  public int getClearY(final int y) {
    return this.prevBounds.getClearY(y - this.shiftY) + this.shiftY;
  }

  public int getFirstClearY(final int y) {
    return this.prevBounds.getFirstClearY(y - this.shiftY) + this.shiftY;
  }

  public int getLeft(final int y) {
    return this.prevBounds.getLeft(y - this.shiftY) + this.shiftLeft;
  }

  public int getLeftClearY(final int y) {
    return this.prevBounds.getLeftClearY(y - this.shiftY) + this.shiftY;
  }

  public int getRight(final int y) {
    return this.prevBounds.getRight(y - this.shiftY) + this.shiftRight;
  }

  public int getRightClearY(final int y) {
    return this.prevBounds.getRightClearY(y - this.shiftY) + this.shiftY;
  }

  public int getMaxY() {
    return this.prevBounds.getMaxY() + this.shiftY;
  }

  @Override
  public boolean equals(final Object obj) {
    // Important for layout caching.
    if (!(obj instanceof ShiftedFloatingBounds)) {
      return false;
    }
    final ShiftedFloatingBounds other = (ShiftedFloatingBounds) obj;
    return (this.shiftY == other.shiftY) && (this.shiftLeft == other.shiftLeft) && (this.shiftRight == other.shiftRight)
        && java.util.Objects.equals(this.prevBounds, other.prevBounds);
  }

  @Override
  public int hashCode() {
    return this.shiftY ^ this.shiftLeft ^ this.shiftRight;
  }
}
