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#include <LibGUI/GPainter.h>
#include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/Layout/LayoutBlock.h>
#include <LibHTML/Layout/LayoutInline.h>
#include <LibHTML/Layout/LayoutReplaced.h>
LayoutBlock::LayoutBlock(const Node* node, NonnullRefPtr<StyleProperties> style)
: LayoutBox(node, move(style))
{
}
LayoutBlock::~LayoutBlock()
{
}
LayoutNode& LayoutBlock::inline_wrapper()
{
if (!last_child() || !last_child()->is_block() || last_child()->node() != nullptr) {
append_child(adopt(*new LayoutBlock(nullptr, style_for_anonymous_block())));
}
return *last_child();
}
void LayoutBlock::layout()
{
compute_width();
compute_position();
if (children_are_inline())
layout_inline_children();
else
layout_block_children();
compute_height();
}
void LayoutBlock::layout_block_children()
{
ASSERT(!children_are_inline());
int content_height = 0;
for_each_child([&](auto& child) {
ASSERT(is<LayoutBlock>(child));
auto& child_block = static_cast<LayoutBlock&>(child);
child_block.layout();
content_height = child_block.rect().bottom() + child_block.box_model().full_margin().bottom - rect().top();
});
rect().set_height(content_height);
}
void LayoutBlock::layout_inline_children()
{
ASSERT(children_are_inline());
m_line_boxes.clear();
for_each_child([&](auto& child) {
ASSERT(child.is_inline());
child.split_into_lines(*this);
});
int min_line_height = style().line_height();
int content_height = 0;
for (auto& line_box : m_line_boxes) {
int max_height = min_line_height;
for (auto& fragment : line_box.fragments()) {
max_height = max(max_height, fragment.rect().height());
}
for (auto& fragment : line_box.fragments()) {
// Vertically align everyone's bottom to the line.
// FIXME: Support other kinds of vertical alignment.
fragment.rect().set_x(x() + fragment.rect().x());
fragment.rect().set_y(y() + content_height + (max_height - fragment.rect().height()));
if (is<LayoutReplaced>(fragment.layout_node()))
const_cast<LayoutReplaced&>(to<LayoutReplaced>(fragment.layout_node())).set_rect(fragment.rect());
}
content_height += max_height;
}
rect().set_height(content_height);
}
void LayoutBlock::compute_width()
{
auto& style = this->style();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto width = style.length_or_fallback(CSS::PropertyID::Width, auto_value);
auto margin_left = style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value);
auto margin_right = style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value);
auto border_left = style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, zero_value);
auto border_right = style.length_or_fallback(CSS::PropertyID::BorderRightWidth, zero_value);
auto padding_left = style.length_or_fallback(CSS::PropertyID::PaddingLeft, zero_value);
auto padding_right = style.length_or_fallback(CSS::PropertyID::PaddingRight, zero_value);
#ifdef HTML_DEBUG
dbg() << " Left: " << margin_left << "+" << border_left << "+" << padding_left;
dbg() << "Right: " << margin_right << "+" << border_right << "+" << padding_right;
#endif
int total_px = 0;
for (auto& value : { margin_left, border_left, padding_left, width, padding_right, border_right, margin_right }) {
total_px += value.to_px();
}
#ifdef HTML_DEBUG
dbg() << "Total: " << total_px;
#endif
// 10.3.3 Block-level, non-replaced elements in normal flow
// If 'width' is not 'auto' and 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' (plus any of 'margin-left' or 'margin-right' that are not 'auto') is larger than the width of the containing block, then any 'auto' values for 'margin-left' or 'margin-right' are, for the following rules, treated as zero.
if (width.is_auto() && total_px > containing_block()->width()) {
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
}
// 10.3.3 cont'd.
auto underflow_px = containing_block()->width() - total_px;
if (width.is_auto()) {
if (margin_left.is_auto())
margin_left = zero_value;
if (margin_right.is_auto())
margin_right = zero_value;
if (underflow_px >= 0) {
width = Length(underflow_px, Length::Type::Absolute);
} else {
width = zero_value;
margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
}
} else {
if (!margin_left.is_auto() && !margin_right.is_auto()) {
margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
} else if (!margin_left.is_auto() && margin_right.is_auto()) {
margin_right = Length(underflow_px, Length::Type::Absolute);
} else if (margin_left.is_auto() && !margin_right.is_auto()) {
margin_left = Length(underflow_px, Length::Type::Absolute);
} else { // margin_left.is_auto() && margin_right.is_auto()
auto half_of_the_underflow = Length(underflow_px / 2, Length::Type::Absolute);
margin_left = half_of_the_underflow;
margin_right = half_of_the_underflow;
}
}
rect().set_width(width.to_px());
box_model().margin().left = margin_left;
box_model().margin().right = margin_right;
box_model().border().left = border_left;
box_model().border().right = border_right;
box_model().padding().left = padding_left;
box_model().padding().right = padding_right;
}
void LayoutBlock::compute_position()
{
auto& style = this->style();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto width = style.length_or_fallback(CSS::PropertyID::Width, auto_value);
box_model().margin().top = style.length_or_fallback(CSS::PropertyID::MarginTop, zero_value);
box_model().margin().bottom = style.length_or_fallback(CSS::PropertyID::MarginBottom, zero_value);
box_model().border().top = style.length_or_fallback(CSS::PropertyID::BorderTopWidth, zero_value);
box_model().border().bottom = style.length_or_fallback(CSS::PropertyID::BorderBottomWidth, zero_value);
box_model().padding().top = style.length_or_fallback(CSS::PropertyID::PaddingTop, zero_value);
box_model().padding().bottom = style.length_or_fallback(CSS::PropertyID::PaddingBottom, zero_value);
rect().set_x(containing_block()->x() + box_model().margin().left.to_px() + box_model().border().left.to_px() + box_model().padding().left.to_px());
int top_border = -1;
if (previous_sibling() != nullptr) {
auto& previous_sibling_rect = previous_sibling()->rect();
auto& previous_sibling_style = previous_sibling()->box_model();
top_border = previous_sibling_rect.y() + previous_sibling_rect.height();
top_border += previous_sibling_style.full_margin().bottom;
} else {
top_border = containing_block()->y();
}
rect().set_y(top_border + box_model().full_margin().top);
}
void LayoutBlock::compute_height()
{
auto& style = this->style();
auto height_property = style.property(CSS::PropertyID::Height);
if (!height_property.has_value())
return;
auto height_length = height_property.value()->to_length();
if (height_length.is_absolute())
rect().set_height(height_length.to_px());
}
void LayoutBlock::render(RenderingContext& context)
{
if (!is_visible())
return;
LayoutBox::render(context);
if (children_are_inline()) {
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
if (context.should_show_line_box_borders())
context.painter().draw_rect(fragment.rect(), Color::Green);
fragment.render(context);
}
}
}
}
bool LayoutBlock::children_are_inline() const
{
return first_child() && first_child()->is_inline();
}
HitTestResult LayoutBlock::hit_test(const Point& position) const
{
if (!children_are_inline())
return LayoutNode::hit_test(position);
HitTestResult result;
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
if (fragment.rect().contains(position)) {
return { fragment.layout_node() };
}
}
}
return {};
}
NonnullRefPtr<StyleProperties> LayoutBlock::style_for_anonymous_block() const
{
auto new_style = StyleProperties::create();
style().for_each_property([&](auto property_id, auto& value) {
if (StyleResolver::is_inherited_property(property_id))
new_style->set_property(property_id, value);
});
return new_style;
}
LineBox& LayoutBlock::ensure_last_line_box()
{
if (m_line_boxes.is_empty())
m_line_boxes.append(LineBox());
return m_line_boxes.last();
}
LineBox& LayoutBlock::add_line_box()
{
m_line_boxes.append(LineBox());
return m_line_boxes.last();
}
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