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/*
* 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 <LibGUI/Painter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/Frame/Frame.h>
#include <LibWeb/Layout/LayoutBlock.h>
#include <LibWeb/Layout/LayoutDocument.h>
#include <LibWeb/Layout/LayoutNode.h>
#include <LibWeb/Layout/LayoutReplaced.h>
namespace Web {
LayoutNode::LayoutNode(Document& document, const Node* node)
: m_document(document)
, m_node(node)
{
if (m_node)
m_node->set_layout_node({}, this);
}
LayoutNode::~LayoutNode()
{
if (m_node && m_node->layout_node() == this)
m_node->set_layout_node({}, nullptr);
}
void LayoutNode::layout(LayoutMode layout_mode)
{
for_each_child([&](auto& child) {
child.layout(layout_mode);
});
}
bool LayoutNode::can_contain_boxes_with_position_absolute() const
{
return style().position() != CSS::Position::Static || is_root();
}
const LayoutBlock* LayoutNode::containing_block() const
{
auto nearest_block_ancestor = [this] {
auto* ancestor = parent();
while (ancestor && !is<LayoutBlock>(*ancestor))
ancestor = ancestor->parent();
return to<LayoutBlock>(ancestor);
};
if (is_text())
return nearest_block_ancestor();
auto position = style().position();
if (position == CSS::Position::Absolute) {
auto* ancestor = parent();
while (ancestor && !ancestor->can_contain_boxes_with_position_absolute())
ancestor = ancestor->parent();
while (ancestor && (!is<LayoutBlock>(ancestor) || ancestor->is_anonymous()))
ancestor = ancestor->containing_block();
return to<LayoutBlock>(ancestor);
}
if (position == CSS::Position::Fixed)
return &root();
return nearest_block_ancestor();
}
void LayoutNode::paint(PaintContext& context, PaintPhase phase)
{
if (!is_visible())
return;
for_each_child([&](auto& child) {
if (child.is_box() && to<LayoutBox>(child).stacking_context())
return;
child.paint(context, phase);
});
}
HitTestResult LayoutNode::hit_test(const Gfx::IntPoint& position) const
{
HitTestResult result;
for_each_child([&](auto& child) {
auto child_result = child.hit_test(position);
if (child_result.layout_node)
result = child_result;
});
return result;
}
const Frame& LayoutNode::frame() const
{
ASSERT(document().frame());
return *document().frame();
}
Frame& LayoutNode::frame()
{
ASSERT(document().frame());
return *document().frame();
}
const LayoutDocument& LayoutNode::root() const
{
ASSERT(document().layout_node());
return *document().layout_node();
}
LayoutDocument& LayoutNode::root()
{
ASSERT(document().layout_node());
return *document().layout_node();
}
void LayoutNode::split_into_lines(LayoutBlock& container, LayoutMode layout_mode)
{
for_each_child([&](auto& child) {
child.split_into_lines(container, layout_mode);
});
}
void LayoutNode::set_needs_display()
{
if (auto* block = containing_block()) {
block->for_each_fragment([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
frame().set_needs_display(enclosing_int_rect(fragment.absolute_rect()));
}
return IterationDecision::Continue;
});
}
}
float LayoutNode::font_size() const
{
// FIXME: This doesn't work right for relative font-sizes
auto length = specified_style().length_or_fallback(CSS::PropertyID::FontSize, Length(10, Length::Type::Px));
return length.raw_value();
}
Gfx::FloatPoint LayoutNode::box_type_agnostic_position() const
{
if (is_box())
return to<LayoutBox>(*this).absolute_position();
ASSERT(is_inline());
Gfx::FloatPoint position;
if (auto* block = containing_block()) {
block->for_each_fragment([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
position = fragment.absolute_rect().location();
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
}
return position;
}
bool LayoutNode::is_absolutely_positioned() const
{
if (!has_style())
return false;
auto position = style().position();
return position == CSS::Position::Absolute || position == CSS::Position::Fixed;
}
bool LayoutNode::is_fixed_position() const
{
if (!has_style())
return false;
auto position = style().position();
return position == CSS::Position::Fixed;
}
LayoutNodeWithStyle::LayoutNodeWithStyle(Document& document, const Node* node, NonnullRefPtr<StyleProperties> specified_style)
: LayoutNode(document, node)
, m_specified_style(move(specified_style))
{
m_has_style = true;
apply_style(*m_specified_style);
}
void LayoutNodeWithStyle::apply_style(const StyleProperties& specified_style)
{
auto& style = static_cast<MutableLayoutStyle&>(m_style);
style.set_position(specified_style.position());
style.set_text_align(specified_style.text_align());
auto white_space = specified_style.white_space();
if (white_space.has_value())
style.set_white_space(white_space.value());
style.set_z_index(specified_style.z_index());
style.set_width(specified_style.length_or_fallback(CSS::PropertyID::Width, {}));
style.set_min_width(specified_style.length_or_fallback(CSS::PropertyID::MinWidth, {}));
style.set_max_width(specified_style.length_or_fallback(CSS::PropertyID::MaxWidth, {}));
style.set_height(specified_style.length_or_fallback(CSS::PropertyID::Height, {}));
style.set_min_height(specified_style.length_or_fallback(CSS::PropertyID::MinHeight, {}));
style.set_max_height(specified_style.length_or_fallback(CSS::PropertyID::MaxHeight, {}));
style.set_offset(specified_style.length_box(CSS::PropertyID::Left, CSS::PropertyID::Top, CSS::PropertyID::Right, CSS::PropertyID::Bottom));
style.set_margin(specified_style.length_box(CSS::PropertyID::MarginLeft, CSS::PropertyID::MarginTop, CSS::PropertyID::MarginRight, CSS::PropertyID::MarginBottom));
style.set_padding(specified_style.length_box(CSS::PropertyID::PaddingLeft, CSS::PropertyID::PaddingTop, CSS::PropertyID::PaddingRight, CSS::PropertyID::PaddingBottom));
style.border_left().width = specified_style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
style.border_top().width = specified_style.length_or_fallback(CSS::PropertyID::BorderTopWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
style.border_right().width = specified_style.length_or_fallback(CSS::PropertyID::BorderRightWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
style.border_bottom().width = specified_style.length_or_fallback(CSS::PropertyID::BorderBottomWidth, {}).resolved_or_zero(*this, 0).to_px(*this);
style.border_left().color = specified_style.color_or_fallback(CSS::PropertyID::BorderLeftColor, document(), Color::Transparent);
style.border_top().color = specified_style.color_or_fallback(CSS::PropertyID::BorderTopColor, document(), Color::Transparent);
style.border_right().color = specified_style.color_or_fallback(CSS::PropertyID::BorderRightColor, document(), Color::Transparent);
style.border_bottom().color = specified_style.color_or_fallback(CSS::PropertyID::BorderBottomColor, document(), Color::Transparent);
}
}
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