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#include <LibGUI/GPainter.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/Layout/LayoutBlock.h>
LayoutBlock::LayoutBlock(const Node* node, StyleProperties&& style_properties)
: LayoutNode(node, move(style_properties))
{
}
LayoutBlock::~LayoutBlock()
{
}
LayoutNode& LayoutBlock::inline_wrapper()
{
if (!last_child() || !last_child()->is_block() || last_child()->node() != nullptr) {
append_child(adopt(*new LayoutBlock(nullptr, {})));
}
return *last_child();
}
void LayoutBlock::layout()
{
compute_width();
compute_position();
int content_height = 0;
for_each_child([&](auto& child) {
child.layout();
content_height = child.rect().bottom() + child.style().full_margin().bottom - rect().top();
});
rect().set_height(content_height);
compute_height();
}
void LayoutBlock::compute_width()
{
auto& style_properties = this->style_properties();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto width = style_properties.length_or_fallback("width", auto_value);
auto margin_left = style_properties.length_or_fallback("margin-left", zero_value);
auto margin_right = style_properties.length_or_fallback("margin-right", zero_value);
auto border_left = style_properties.length_or_fallback("border-left", zero_value);
auto border_right = style_properties.length_or_fallback("border-right", zero_value);
auto padding_left = style_properties.length_or_fallback("padding-left", zero_value);
auto padding_right = style_properties.length_or_fallback("padding-right", 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()->rect().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()->rect().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());
style().margin().left = margin_left;
style().margin().right = margin_right;
style().border().left = border_left;
style().border().right = border_right;
style().padding().left = padding_left;
style().padding().right = padding_right;
}
void LayoutBlock::compute_position()
{
auto& style_properties = this->style_properties();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto width = style_properties.length_or_fallback("width", auto_value);
style().margin().top = style_properties.length_or_fallback("margin-top", zero_value);
style().margin().bottom = style_properties.length_or_fallback("margin-bottom", zero_value);
style().border().top = style_properties.length_or_fallback("border-top", zero_value);
style().border().bottom = style_properties.length_or_fallback("border-bottom", zero_value);
style().padding().top = style_properties.length_or_fallback("padding-top", zero_value);
style().padding().bottom = style_properties.length_or_fallback("padding-bottom", zero_value);
rect().set_x(containing_block()->rect().x() + style().margin().left.to_px() + style().border().left.to_px() + style().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()->style();
top_border = previous_sibling_rect.y() + previous_sibling_rect.height();
top_border += previous_sibling_style.full_margin().bottom;
} else {
top_border = containing_block()->rect().y();
}
rect().set_y(top_border + style().full_margin().top);
}
void LayoutBlock::compute_height()
{
auto& style_properties = this->style_properties();
auto height_property = style_properties.property("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)
{
LayoutNode::render(context);
// FIXME: position this properly
if (style_properties().string_or_fallback("display", "block") == "list-item") {
Rect bullet_rect {
rect().x() - 8,
rect().y() + 4,
3,
3
};
context.painter().fill_rect(bullet_rect, Color::Black);
}
}
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