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https://github.com/RGBCube/serenity
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LibWeb: Move width into LayoutStyle
This patch also adds the ability for Length to contain percentage values. This is a little off-spec, but will make storing and dealing with lengths a lot easier. To resolve a Length to a px-or-auto Length, there are now helpers for that. After calling them, you no longer have to think about em, rem, %, and such things.
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959464fce4
commit
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6 changed files with 53 additions and 29 deletions
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@ -53,6 +53,8 @@ const char* Length::unit_name() const
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return "rem";
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case Type::Auto:
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return "auto";
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case Type::Percentage:
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return "percentage";
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case Type::Undefined:
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return "undefined";
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}
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@ -35,6 +35,7 @@ class Length {
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public:
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enum class Type {
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Undefined,
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Percentage,
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Auto,
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Px,
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Em,
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@ -56,7 +57,24 @@ public:
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static Length make_auto() { return Length(0, Type::Auto); }
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static Length make_px(float value) { return Length(value, Type::Px); }
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Length resolved(const Length& fallback_for_undefined, const LayoutNode& layout_node, float reference_for_percent) const
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{
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if (is_undefined())
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return fallback_for_undefined;
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if (is_percentage())
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return make_px(raw_value() / 100.0 * reference_for_percent);
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if (is_relative())
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return make_px(to_px(layout_node));
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return *this;
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}
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Length resolved_or_auto(const LayoutNode& layout_node, float reference_for_percent) const
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{
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return resolved(make_auto(), layout_node, reference_for_percent);
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}
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bool is_undefined() const { return m_type == Type::Undefined; }
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bool is_percentage() const { return m_type == Type::Percentage; }
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bool is_auto() const { return m_type == Type::Auto; }
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bool is_absolute() const { return m_type == Type::Px; }
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bool is_relative() const { return m_type == Type::Em || m_type == Type::Rem; }
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@ -72,6 +90,7 @@ public:
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case Type::Px:
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return m_value;
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case Type::Undefined:
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case Type::Percentage:
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default:
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ASSERT_NOT_REACHED();
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}
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@ -69,20 +69,20 @@ void LayoutBlock::layout_absolutely_positioned_descendant(LayoutBox& box)
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{
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box.layout(LayoutMode::Default);
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auto& box_model = box.box_model();
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auto& style = box.specified_style();
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auto& specified_style = box.specified_style();
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auto zero_value = Length::make_px(0);
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auto specified_width = style.length_or_fallback(CSS::PropertyID::Width, Length::make_auto(), width());
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auto specified_width = box.style().width().resolved_or_auto(box, width());
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box_model.margin.top = style.length_or_fallback(CSS::PropertyID::MarginTop, Length::make_auto(), height());
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box_model.margin.right = style.length_or_fallback(CSS::PropertyID::MarginRight, Length::make_auto(), width());
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box_model.margin.bottom = style.length_or_fallback(CSS::PropertyID::MarginBottom, Length::make_auto(), height());
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box_model.margin.left = style.length_or_fallback(CSS::PropertyID::MarginLeft, Length::make_auto(), width());
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box_model.margin.top = specified_style.length_or_fallback(CSS::PropertyID::MarginTop, Length::make_auto(), height());
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box_model.margin.right = specified_style.length_or_fallback(CSS::PropertyID::MarginRight, Length::make_auto(), width());
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box_model.margin.bottom = specified_style.length_or_fallback(CSS::PropertyID::MarginBottom, Length::make_auto(), height());
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box_model.margin.left = specified_style.length_or_fallback(CSS::PropertyID::MarginLeft, Length::make_auto(), width());
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box_model.offset.top = style.length_or_fallback(CSS::PropertyID::Top, Length::make_auto(), height());
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box_model.offset.right = style.length_or_fallback(CSS::PropertyID::Right, Length::make_auto(), width());
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box_model.offset.bottom = style.length_or_fallback(CSS::PropertyID::Bottom, Length::make_auto(), height());
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box_model.offset.left = style.length_or_fallback(CSS::PropertyID::Left, Length::make_auto(), width());
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box_model.offset.top = specified_style.length_or_fallback(CSS::PropertyID::Top, Length::make_auto(), height());
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box_model.offset.right = specified_style.length_or_fallback(CSS::PropertyID::Right, Length::make_auto(), width());
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box_model.offset.bottom = specified_style.length_or_fallback(CSS::PropertyID::Bottom, Length::make_auto(), height());
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box_model.offset.left = specified_style.length_or_fallback(CSS::PropertyID::Left, Length::make_auto(), width());
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if (box_model.offset.left.is_auto() && specified_width.is_auto() && box_model.offset.right.is_auto()) {
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if (box_model.margin.left.is_auto())
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@ -164,8 +164,7 @@ void LayoutBlock::layout_contained_boxes(LayoutMode layout_mode)
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});
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if (layout_mode != LayoutMode::Default) {
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auto specified_width = specified_style().length_or_fallback(CSS::PropertyID::Width, Length::make_auto(), containing_block()->width());
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if (specified_width.is_auto())
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if (style().width().is_undefined() || style().width().is_auto())
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set_width(content_width);
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}
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@ -277,7 +276,7 @@ void LayoutBlock::layout_inline_children(LayoutMode layout_mode)
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void LayoutBlock::compute_width_for_absolutely_positioned_block()
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{
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auto& style = this->specified_style();
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auto& specified_style = this->specified_style();
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auto& containing_block = *this->containing_block();
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auto zero_value = Length::make_px(0);
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@ -289,15 +288,15 @@ void LayoutBlock::compute_width_for_absolutely_positioned_block()
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Length padding_right = Length::make_auto();
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auto try_compute_width = [&](const auto& a_width) {
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margin_left = style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value, containing_block.width());
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margin_right = style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value, containing_block.width());
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border_left = style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, zero_value);
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border_right = style.length_or_fallback(CSS::PropertyID::BorderRightWidth, zero_value);
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padding_left = style.length_or_fallback(CSS::PropertyID::PaddingLeft, zero_value, containing_block.width());
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padding_right = style.length_or_fallback(CSS::PropertyID::PaddingRight, zero_value, containing_block.width());
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margin_left = specified_style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value, containing_block.width());
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margin_right = specified_style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value, containing_block.width());
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border_left = specified_style.length_or_fallback(CSS::PropertyID::BorderLeftWidth, zero_value);
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border_right = specified_style.length_or_fallback(CSS::PropertyID::BorderRightWidth, zero_value);
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padding_left = specified_style.length_or_fallback(CSS::PropertyID::PaddingLeft, zero_value, containing_block.width());
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padding_right = specified_style.length_or_fallback(CSS::PropertyID::PaddingRight, zero_value, containing_block.width());
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auto left = style.length_or_fallback(CSS::PropertyID::Left, Length::make_auto(), containing_block.width());
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auto right = style.length_or_fallback(CSS::PropertyID::Right, Length::make_auto(), containing_block.width());
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auto left = specified_style.length_or_fallback(CSS::PropertyID::Left, Length::make_auto(), containing_block.width());
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auto right = specified_style.length_or_fallback(CSS::PropertyID::Right, Length::make_auto(), containing_block.width());
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auto width = a_width;
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auto solve_for_left = [&] {
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@ -386,14 +385,14 @@ void LayoutBlock::compute_width_for_absolutely_positioned_block()
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return width;
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};
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auto specified_width = style.length_or_fallback(CSS::PropertyID::Width, Length::make_auto(), containing_block.width());
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auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
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// 1. The tentative used width is calculated (without 'min-width' and 'max-width')
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auto used_width = try_compute_width(specified_width);
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// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
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// but this time using the computed value of 'max-width' as the computed value for 'width'.
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auto specified_max_width = style.length_or_fallback(CSS::PropertyID::MaxWidth, Length::make_auto(), containing_block.width());
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auto specified_max_width = specified_style.length_or_fallback(CSS::PropertyID::MaxWidth, Length::make_auto(), containing_block.width());
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if (!specified_max_width.is_auto()) {
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if (used_width.to_px(*this) > specified_max_width.to_px(*this)) {
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used_width = try_compute_width(specified_max_width);
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@ -402,7 +401,7 @@ void LayoutBlock::compute_width_for_absolutely_positioned_block()
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// 3. If the resulting width is smaller than 'min-width', the rules above are applied again,
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// but this time using the value of 'min-width' as the computed value for 'width'.
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auto specified_min_width = style.length_or_fallback(CSS::PropertyID::MinWidth, Length::make_auto(), containing_block.width());
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auto specified_min_width = specified_style.length_or_fallback(CSS::PropertyID::MinWidth, Length::make_auto(), containing_block.width());
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if (!specified_min_width.is_auto()) {
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if (used_width.to_px(*this) < specified_min_width.to_px(*this)) {
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used_width = try_compute_width(specified_min_width);
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@ -226,6 +226,7 @@ void LayoutNodeWithStyle::apply_style(const StyleProperties& specified_style)
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style.set_position(specified_style.position());
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style.set_text_align(specified_style.text_align());
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style.set_z_index(specified_style.z_index());
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style.set_width(specified_style.length_or_fallback(CSS::PropertyID::Width, {}));
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}
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}
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@ -45,13 +45,13 @@ float LayoutReplaced::calculate_width() const
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{
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// 10.3.2 [Inline,] replaced elements
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auto& style = this->specified_style();
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auto& specified_style = this->specified_style();
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auto auto_value = Length::make_auto();
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auto zero_value = Length::make_px(0);
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auto& containing_block = *this->containing_block();
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auto margin_left = style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value, containing_block.width());
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auto margin_right = style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value, containing_block.width());
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auto margin_left = specified_style.length_or_fallback(CSS::PropertyID::MarginLeft, zero_value, containing_block.width());
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auto margin_right = specified_style.length_or_fallback(CSS::PropertyID::MarginRight, zero_value, containing_block.width());
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// A computed value of 'auto' for 'margin-left' or 'margin-right' becomes a used value of '0'.
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if (margin_left.is_auto())
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@ -59,8 +59,8 @@ float LayoutReplaced::calculate_width() const
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if (margin_right.is_auto())
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margin_right = zero_value;
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auto specified_width = style.length_or_fallback(CSS::PropertyID::Width, auto_value, containing_block.width());
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auto specified_height = style.length_or_fallback(CSS::PropertyID::Height, auto_value, containing_block.height());
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auto specified_width = style().width().resolved_or_auto(*this, containing_block.width());
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auto specified_height = specified_style.length_or_fallback(CSS::PropertyID::Height, auto_value, containing_block.height());
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// FIXME: Actually compute 'width'
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auto computed_width = specified_width;
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@ -36,11 +36,13 @@ public:
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Optional<int> z_index() const { return m_z_index; }
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CSS::TextAlign text_align() const { return m_text_align; }
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CSS::Position position() const { return m_position; }
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const Length& width() const { return m_width; }
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protected:
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Optional<int> m_z_index;
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CSS::TextAlign m_text_align;
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CSS::Position m_position;
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Length m_width;
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};
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class ImmutableLayoutStyle final : public LayoutStyle {
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@ -51,6 +53,7 @@ public:
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void set_z_index(Optional<int> value) { m_z_index = value; }
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void set_text_align(CSS::TextAlign text_align) { m_text_align = text_align; }
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void set_position(CSS::Position position) { m_position = position; }
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void set_width(const Length& width) { m_width = width; }
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};
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}
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