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115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
#include <LibHTML/CSS/StyledNode.h>
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#include <LibHTML/DOM/Element.h>
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#include <LibHTML/Layout/LayoutBlock.h>
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LayoutBlock::LayoutBlock(const Node* node, const StyledNode* styled_node)
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: LayoutNode(node, styled_node)
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{
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}
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LayoutBlock::~LayoutBlock()
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{
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}
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LayoutNode& LayoutBlock::inline_wrapper()
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{
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if (!last_child() || !last_child()->is_block()) {
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append_child(adopt(*new LayoutBlock(nullptr, nullptr)));
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}
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return *last_child();
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}
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void LayoutBlock::layout()
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{
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compute_width();
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LayoutNode::layout();
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compute_height();
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}
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void LayoutBlock::compute_width()
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{
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if (!styled_node()) {
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// I guess the size is "auto" in this case.
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return;
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}
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auto& styled_node = *this->styled_node();
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auto auto_value = Length();
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auto zero_value = Length(0, Length::Type::Absolute);
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auto length_or_fallback = [&](const StringView& property_name, const Length& fallback) {
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auto value = styled_node.property(property_name);
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if (!value.has_value())
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return fallback;
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return value.value()->to_length();
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};
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auto width = length_or_fallback("width", auto_value);
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auto margin_left = length_or_fallback("margin-left", zero_value);
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auto margin_right = length_or_fallback("margin-right", zero_value);
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auto border_left = length_or_fallback("border-left", zero_value);
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auto border_right = length_or_fallback("border-right", zero_value);
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auto padding_left = length_or_fallback("padding-left", zero_value);
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auto padding_right = length_or_fallback("padding-right", zero_value);
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dbg() << " Left: " << margin_left << "+" << border_left << "+" << padding_left;
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dbg() << "Right: " << margin_right << "+" << border_right << "+" << padding_right;
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int total_px = 0;
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for (auto& value : { margin_left, border_left, padding_left, width, padding_right, border_right, margin_right }) {
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total_px += value.to_px();
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}
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dbg() << "Total: " << total_px;
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// 10.3.3 Block-level, non-replaced elements in normal flow
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// 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.
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if (width.is_auto() && total_px > containing_block()->rect().width()) {
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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}
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// 10.3.3 cont'd.
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auto underflow_px = containing_block()->rect().width() - total_px;
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if (width.is_auto()) {
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if (margin_left.is_auto())
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margin_left = zero_value;
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if (margin_right.is_auto())
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margin_right = zero_value;
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if (underflow_px >= 0) {
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width = Length(underflow_px, Length::Type::Absolute);
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} else {
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width = zero_value;
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margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
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}
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} else {
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if (!margin_left.is_auto() && !margin_right.is_auto()) {
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margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
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} else if (!margin_left.is_auto() && margin_right.is_auto()) {
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margin_right = Length(underflow_px, Length::Type::Absolute);
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} else if (margin_left.is_auto() && !margin_right.is_auto()) {
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margin_left = Length(underflow_px, Length::Type::Absolute);
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} else { // margin_left.is_auto() && margin_right.is_auto()
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auto half_of_the_underflow = Length(underflow_px / 2, Length::Type::Absolute);
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margin_left = half_of_the_underflow;
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margin_right = half_of_the_underflow;
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}
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}
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rect().set_width(width.to_px());
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style().margin().left = margin_left;
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style().margin().right = margin_right;
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style().border().left = border_left;
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style().border().right = border_right;
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style().padding().left = padding_left;
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style().padding().right = padding_right;
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}
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void LayoutBlock::compute_height()
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{
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}
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