text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <LibWeb/DOM/Element.h>
  #include <LibWeb/Layout/BlockBox.h>
  #include <LibWeb/Layout/InlineFormattingContext.h>
  #include <LibWeb/Layout/ReplacedBox.h>
  
  namespace Web::Layout {
  
  ReplacedBox::ReplacedBox(DOM::Document& document, DOM::Element& element, NonnullRefPtr<CSS::StyleProperties> style)
      : Box(document, &element, move(style))
  {
      // FIXME: Allow non-inline replaced elements.
      set_inline(true);
  }
  
  ReplacedBox::~ReplacedBox()
  {
  }
  
  float ReplacedBox::calculate_width() const
  {
      // 10.3.2 [Inline,] replaced elements
  
      auto zero_value = CSS::Length::make_px(0);
      auto& containing_block = *this->containing_block();
  
      auto margin_left = style().margin().left.resolved_or_zero(*this, containing_block.width());
      auto margin_right = style().margin().right.resolved_or_zero(*this, containing_block.width());
  
      // A computed value of 'auto' for 'margin-left' or 'margin-right' becomes a used value of '0'.
      if (margin_left.is_auto())
          margin_left = zero_value;
      if (margin_right.is_auto())
          margin_right = zero_value;
  
      auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
      auto specified_height = style().height().resolved_or_auto(*this, containing_block.height());
  
      // FIXME: Actually compute 'width'
      auto computed_width = specified_width;
  
      float used_width = specified_width.to_px(*this);
  
      // If 'height' and 'width' both have computed values of 'auto' and the element also has an intrinsic width,
      // then that intrinsic width is the used value of 'width'.
      if (specified_height.is_auto() && specified_width.is_auto() && has_intrinsic_width()) {
          used_width = intrinsic_width();
      }
  
      // If 'height' and 'width' both have computed values of 'auto' and the element has no intrinsic width,
      // but does have an intrinsic height and intrinsic ratio;
      // or if 'width' has a computed value of 'auto',
      // 'height' has some other computed value, and the element does have an intrinsic ratio; then the used value of 'width' is:
      //
      //     (used height) * (intrinsic ratio)
      else if ((specified_height.is_auto() && specified_width.is_auto() && !has_intrinsic_width() && has_intrinsic_height() && has_intrinsic_ratio()) || (computed_width.is_auto() && has_intrinsic_ratio())) {
          used_width = calculate_height() * intrinsic_ratio();
      }
  
      else if (computed_width.is_auto() && has_intrinsic_width()) {
          used_width = intrinsic_width();
      }
  
      else if (computed_width.is_auto()) {
          used_width = 300;
      }
  
      return used_width;
  }
  
  float ReplacedBox::calculate_height() const
  {
      // 10.6.2 Inline replaced elements, block-level replaced elements in normal flow,
      // 'inline-block' replaced elements in normal flow and floating replaced elements
      auto& containing_block = *this->containing_block();
  
      auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
      auto specified_height = style().height().resolved_or_auto(*this, containing_block.height());
  
      float used_height = specified_height.to_px(*this);
  
      // If 'height' and 'width' both have computed values of 'auto' and the element also has
      // an intrinsic height, then that intrinsic height is the used value of 'height'.
      if (specified_width.is_auto() && specified_height.is_auto() && has_intrinsic_height())
          used_height = intrinsic_height();
      else if (specified_height.is_auto() && has_intrinsic_ratio())
          used_height = calculate_width() / intrinsic_ratio();
      else if (specified_height.is_auto() && has_intrinsic_height())
          used_height = intrinsic_height();
      else if (specified_height.is_auto())
          used_height = 150;
  
      return used_height;
  }
  
  void ReplacedBox::split_into_lines(InlineFormattingContext& context, LayoutMode)
  {
      auto& containing_block = context.containing_block();
  
      // FIXME: This feels out of place. It would be nice if someone at a higher level
      //        made sure we had usable geometry by the time we start splitting.
      prepare_for_replaced_layout();
      auto width = calculate_width();
      auto height = calculate_height();
  
      auto* line_box = &containing_block.ensure_last_line_box();
      if (line_box->width() > 0 && line_box->width() + width > context.available_width_at_line(containing_block.line_boxes().size() - 1))
          line_box = &containing_block.add_line_box();
      line_box->add_fragment(*this, 0, 0, width, height);
  }
  
  }
  