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https://github.com/LadybirdBrowser/ladybird.git
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235 lines
8.3 KiB
C++
235 lines
8.3 KiB
C++
#include <LibGUI/GPainter.h>
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#include <LibHTML/DOM/Element.h>
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#include <LibHTML/Layout/LayoutBlock.h>
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#include <LibHTML/Layout/LayoutInline.h>
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LayoutBlock::LayoutBlock(const Node* node, NonnullRefPtr<StyleProperties> style_properties)
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: LayoutNode(node, move(style_properties))
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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() || last_child()->node() != nullptr) {
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append_child(adopt(*new LayoutBlock(nullptr, style())));
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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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compute_position();
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if (children_are_inline())
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layout_inline_children();
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else
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layout_block_children();
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compute_height();
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}
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void LayoutBlock::layout_block_children()
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{
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ASSERT(!children_are_inline());
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int content_height = 0;
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for_each_child([&](auto& child) {
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child.layout();
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content_height = child.rect().bottom() + child.box_model().full_margin().bottom - rect().top();
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});
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rect().set_height(content_height);
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}
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void LayoutBlock::layout_inline_children()
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{
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ASSERT(children_are_inline());
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m_line_boxes.clear();
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for_each_child([&](auto& child) {
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ASSERT(child.is_inline());
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static_cast<LayoutInline&>(child).split_into_lines(*this);
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});
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int content_height = 0;
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for (auto& line_box : m_line_boxes) {
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int max_height = 0;
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for (auto& fragment : line_box.fragments()) {
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max_height = max(max_height, fragment.rect().height());
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}
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for (auto& fragment : line_box.fragments()) {
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// Vertically align everyone's bottom to the line.
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// FIXME: Support other kinds of vertical alignment.
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fragment.rect().set_x(rect().x() + fragment.rect().x());
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fragment.rect().set_y(rect().y() + content_height + (max_height - fragment.rect().height()));
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}
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content_height += max_height;
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}
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rect().set_height(content_height);
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}
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void LayoutBlock::compute_width()
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{
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auto& style_properties = this->style();
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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 width = style_properties.length_or_fallback("width", auto_value);
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auto margin_left = style_properties.length_or_fallback("margin-left", zero_value);
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auto margin_right = style_properties.length_or_fallback("margin-right", zero_value);
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auto border_left = style_properties.length_or_fallback("border-left", zero_value);
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auto border_right = style_properties.length_or_fallback("border-right", zero_value);
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auto padding_left = style_properties.length_or_fallback("padding-left", zero_value);
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auto padding_right = style_properties.length_or_fallback("padding-right", zero_value);
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#ifdef HTML_DEBUG
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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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#endif
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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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#ifdef HTML_DEBUG
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dbg() << "Total: " << total_px;
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#endif
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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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box_model().margin().left = margin_left;
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box_model().margin().right = margin_right;
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box_model().border().left = border_left;
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box_model().border().right = border_right;
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box_model().padding().left = padding_left;
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box_model().padding().right = padding_right;
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}
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void LayoutBlock::compute_position()
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{
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auto& style_properties = this->style();
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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 width = style_properties.length_or_fallback("width", auto_value);
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box_model().margin().top = style_properties.length_or_fallback("margin-top", zero_value);
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box_model().margin().bottom = style_properties.length_or_fallback("margin-bottom", zero_value);
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box_model().border().top = style_properties.length_or_fallback("border-top", zero_value);
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box_model().border().bottom = style_properties.length_or_fallback("border-bottom", zero_value);
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box_model().padding().top = style_properties.length_or_fallback("padding-top", zero_value);
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box_model().padding().bottom = style_properties.length_or_fallback("padding-bottom", zero_value);
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rect().set_x(containing_block()->rect().x() + box_model().margin().left.to_px() + box_model().border().left.to_px() + box_model().padding().left.to_px());
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int top_border = -1;
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if (previous_sibling() != nullptr) {
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auto& previous_sibling_rect = previous_sibling()->rect();
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auto& previous_sibling_style = previous_sibling()->box_model();
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top_border = previous_sibling_rect.y() + previous_sibling_rect.height();
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top_border += previous_sibling_style.full_margin().bottom;
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} else {
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top_border = containing_block()->rect().y();
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}
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rect().set_y(top_border + box_model().full_margin().top);
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}
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void LayoutBlock::compute_height()
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{
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auto& style_properties = this->style();
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auto height_property = style_properties.property("height");
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if (!height_property.has_value())
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return;
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auto height_length = height_property.value()->to_length();
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if (height_length.is_absolute())
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rect().set_height(height_length.to_px());
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}
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void LayoutBlock::render(RenderingContext& context)
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{
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LayoutNode::render(context);
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// FIXME: position this properly
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if (style().string_or_fallback("display", "block") == "list-item") {
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Rect bullet_rect {
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rect().x() - 8,
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rect().y() + 4,
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3,
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3
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};
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context.painter().fill_rect(bullet_rect, style().color_or_fallback("color", Color::Black));
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}
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if (children_are_inline()) {
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for (auto& line_box : m_line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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fragment.render(context);
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}
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}
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}
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}
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bool LayoutBlock::children_are_inline() const
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{
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return first_child() && !first_child()->is_block();
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}
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HitTestResult LayoutBlock::hit_test(const Point& position) const
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{
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if (!children_are_inline())
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return LayoutNode::hit_test(position);
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HitTestResult result;
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for (auto& line_box : m_line_boxes) {
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for (auto& fragment : line_box.fragments()) {
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if (fragment.rect().contains(position)) {
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return { fragment.layout_node() };
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}
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}
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}
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return {};
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}
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