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/*
* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Utf8View.h>
#include <LibWeb/DOM/Range.h>
#include <LibWeb/Layout/LayoutState.h>
#include <LibWeb/Layout/LineBoxFragment.h>
#include <LibWeb/Layout/TextNode.h>
#include <LibWeb/Layout/Viewport.h>
#include <ctype.h>
namespace Web::Layout {
bool LineBoxFragment::ends_in_whitespace() const
{
auto text = this->text();
if (text.is_empty())
return false;
return isspace(text[text.length() - 1]);
}
bool LineBoxFragment::is_justifiable_whitespace() const
{
return text() == " ";
}
StringView LineBoxFragment::text() const
{
if (!is<TextNode>(layout_node()))
return {};
return verify_cast<TextNode>(layout_node()).text_for_rendering().substring_view(m_start, m_length);
}
CSSPixelRect const LineBoxFragment::absolute_rect() const
{
CSSPixelRect rect { {}, size() };
rect.set_location(m_layout_node->containing_block()->paintable_box()->absolute_position());
rect.translate_by(offset());
return rect;
}
int LineBoxFragment::text_index_at(CSSPixels x) const
{
if (!is<TextNode>(layout_node()))
return 0;
auto& layout_text = verify_cast<TextNode>(layout_node());
auto& font = layout_text.font();
Utf8View view(text());
CSSPixels relative_x = x - absolute_x();
float glyph_spacing = font.glyph_spacing();
if (relative_x < 0)
return 0;
CSSPixels width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) {
auto previous_it = it;
CSSPixels glyph_width = font.glyph_or_emoji_width(it);
if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
return m_start + view.byte_offset_of(previous_it);
width_so_far += glyph_width + glyph_spacing;
}
return m_start + m_length;
}
CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
{
if (layout_node().selection_state() == Node::SelectionState::None)
return {};
if (layout_node().selection_state() == Node::SelectionState::Full)
return absolute_rect();
if (!is<TextNode>(layout_node()))
return {};
auto selection = layout_node().root().selection();
if (!selection)
return {};
auto range = selection->range();
if (!range)
return {};
// FIXME: m_start and m_length should be unsigned and then we won't need these casts.
auto const start_index = static_cast<unsigned>(m_start);
auto const end_index = static_cast<unsigned>(m_start) + static_cast<unsigned>(m_length);
auto text = this->text();
if (layout_node().selection_state() == Node::SelectionState::StartAndEnd) {
// we are in the start/end node (both the same)
if (start_index > range->end_offset())
return {};
if (end_index < range->start_offset())
return {};
if (range->start_offset() == range->end_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = min(m_length, range->end_offset() - m_start);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Node::SelectionState::Start) {
// we are in the start node
if (end_index < range->start_offset())
return {};
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = m_length;
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
if (layout_node().selection_state() == Node::SelectionState::End) {
// we are in the end node
if (start_index > range->end_offset())
return {};
auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(range->end_offset() - m_start, m_length);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
rect.set_width(pixel_width_of_selection);
return rect;
}
return {};
}
bool LineBoxFragment::is_atomic_inline() const
{
return layout_node().is_replaced_box() || (layout_node().display().is_inline_outside() && !layout_node().display().is_flow_inside());
}
}
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