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 <AK/Utf8View.h>
  #include <LibGUI/Painter.h>
  #include <LibWeb/Layout/LayoutDocument.h>
  #include <LibWeb/Layout/LayoutText.h>
  #include <LibWeb/Layout/LineBoxFragment.h>
  #include <LibWeb/RenderingContext.h>
  
  namespace Web {
  
  void LineBoxFragment::render(RenderingContext& context)
  {
      for (auto* ancestor = layout_node().parent(); ancestor; ancestor = ancestor->parent()) {
          if (!ancestor->is_visible())
              return;
      }
  
      if (is<LayoutText>(layout_node())) {
          to<LayoutText>(layout_node()).render_fragment(context, *this);
      }
  }
  
  bool LineBoxFragment::is_justifiable_whitespace() const
  {
      return text() == " ";
  }
  
  StringView LineBoxFragment::text() const
  {
      if (!is<LayoutText>(layout_node()))
          return {};
      return to<LayoutText>(layout_node()).text_for_rendering().substring_view(m_start, m_length);
  }
  
  int LineBoxFragment::text_index_at(float x) const
  {
      if (!layout_node().is_text())
          return 0;
      auto& layout_text = to<LayoutText>(layout_node());
      auto& font = layout_text.style().font();
      Utf8View view(text());
  
      float relative_x = x - m_rect.location().x();
      float glyph_spacing = font.glyph_spacing();
  
      float width_so_far = 0;
      for (auto it = view.begin(); it != view.end(); ++it) {
          float glyph_width = font.glyph_or_emoji_width(*it);
          if ((width_so_far + glyph_width + glyph_spacing) > relative_x)
              return m_start + view.byte_offset_of(it);
          width_so_far += glyph_width + glyph_spacing;
      }
      return m_start + m_length - 1;
  }
  
  }
  