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LibWeb: Start fleshing out support for relative CSS units

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This patch introduces support for more than just "absolute px" units in
our Length class. It now also supports "em" and "rem", which are units
relative to the font-size of the current layout node and the <html>
element's layout node respectively.
This commit is contained in:
Andreas Kling 2020-06-07 17:55:46 +02:00
parent d93bf78346
commit 731685468a
16 changed files with 163 additions and 92 deletions
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53
Libraries/LibWeb/Layout/LayoutBlock.cpp
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@ -86,7 +86,7 @@ void LayoutBlock::layout_block_children(LayoutMode layout_mode)
child_block.layout(layout_mode);
if (!child_block.is_absolutely_positioned())
content_height = child_block.rect().bottom() + child_block.box_model().full_margin().bottom - rect().top();
content_height = child_block.rect().bottom() + child_block.box_model().full_margin(*this).bottom - rect().top();
});
if (layout_mode != LayoutMode::Default) {
float max_width = 0;
@ -112,7 +112,7 @@ void LayoutBlock::layout_inline_children(LayoutMode layout_mode)
line_box.trim_trailing_whitespace();
}
float min_line_height = style().line_height();
float min_line_height = style().line_height(*this);
float line_spacing = min_line_height - style().font().glyph_height();
float content_height = 0;
@ -221,7 +221,7 @@ void LayoutBlock::compute_width()
auto& style = this->style();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto zero_value = Length(0, Length::Type::Px);
Length margin_left;
Length margin_right;
@ -247,7 +247,7 @@ void LayoutBlock::compute_width()
float total_px = 0;
for (auto& value : { margin_left, border_left, padding_left, width, padding_right, border_right, margin_right }) {
total_px += value.to_px();
total_px += value.to_px(*this);
}
#ifdef HTML_DEBUG
@ -273,20 +273,20 @@ void LayoutBlock::compute_width()
if (margin_right.is_auto())
margin_right = zero_value;
if (underflow_px >= 0) {
width = Length(underflow_px, Length::Type::Absolute);
width = Length(underflow_px, Length::Type::Px);
} else {
width = zero_value;
margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
margin_right = Length(margin_right.to_px(*this) + underflow_px, Length::Type::Px);
}
} else {
if (!margin_left.is_auto() && !margin_right.is_auto()) {
margin_right = Length(margin_right.to_px() + underflow_px, Length::Type::Absolute);
margin_right = Length(margin_right.to_px(*this) + underflow_px, Length::Type::Px);
} else if (!margin_left.is_auto() && margin_right.is_auto()) {
margin_right = Length(underflow_px, Length::Type::Absolute);
margin_right = Length(underflow_px, Length::Type::Px);
} else if (margin_left.is_auto() && !margin_right.is_auto()) {
margin_left = Length(underflow_px, Length::Type::Absolute);
margin_left = Length(underflow_px, Length::Type::Px);
} else { // margin_left.is_auto() && margin_right.is_auto()
auto half_of_the_underflow = Length(underflow_px / 2, Length::Type::Absolute);
auto half_of_the_underflow = Length(underflow_px / 2, Length::Type::Px);
margin_left = half_of_the_underflow;
margin_right = half_of_the_underflow;
}
@ -323,8 +323,8 @@ void LayoutBlock::compute_width()
// 'padding-right', 'border-right-width', 'margin-right', and the widths of any relevant scroll bars.
float available_width = containing_block.width()
- margin_left.to_px() - border_left.to_px() - padding_left.to_px()
- padding_right.to_px() - border_right.to_px() - margin_right.to_px();
- margin_left.to_px(*this) - border_left.to_px(*this) - padding_left.to_px(*this)
- padding_right.to_px(*this) - border_right.to_px(*this) - margin_right.to_px(*this);
// Calculate the preferred width by formatting the content without breaking lines
// other than where explicit line breaks occur.
@ -338,7 +338,7 @@ void LayoutBlock::compute_width()
float preferred_minimum_width = greatest_child_width();
// Then the shrink-to-fit width is: min(max(preferred minimum width, available width), preferred width).
width = Length(min(max(preferred_minimum_width, available_width), preferred_width), Length::Type::Absolute);
width = Length(min(max(preferred_minimum_width, available_width), preferred_width), Length::Type::Px);
}
}
@ -354,7 +354,7 @@ void LayoutBlock::compute_width()
// but this time using the computed value of 'max-width' as the computed value for 'width'.
auto specified_max_width = style.length_or_fallback(CSS::PropertyID::MaxWidth, auto_value, containing_block.width());
if (!specified_max_width.is_auto()) {
if (used_width.to_px() > specified_max_width.to_px()) {
if (used_width.to_px(*this) > specified_max_width.to_px(*this)) {
used_width = try_compute_width(specified_max_width);
}
}
@ -363,12 +363,12 @@ void LayoutBlock::compute_width()
// but this time using the value of 'min-width' as the computed value for 'width'.
auto specified_min_width = style.length_or_fallback(CSS::PropertyID::MinWidth, auto_value, containing_block.width());
if (!specified_min_width.is_auto()) {
if (used_width.to_px() < specified_min_width.to_px()) {
if (used_width.to_px(*this) < specified_min_width.to_px(*this)) {
used_width = try_compute_width(specified_min_width);
}
}
rect().set_width(used_width.to_px());
rect().set_width(used_width.to_px(*this));
box_model().margin().left = margin_left;
box_model().margin().right = margin_right;
box_model().border().left = border_left;
@ -381,13 +381,10 @@ void LayoutBlock::compute_position()
{
auto& style = this->style();
auto auto_value = Length();
auto zero_value = Length(0, Length::Type::Absolute);
auto zero_value = Length(0, Length::Type::Px);
auto& containing_block = *this->containing_block();
auto width = style.length_or_fallback(CSS::PropertyID::Width, auto_value, containing_block.width());
if (style.position() == CSS::Position::Absolute) {
box_model().offset().top = style.length_or_fallback(CSS::PropertyID::Top, zero_value, containing_block.height());
box_model().offset().right = style.length_or_fallback(CSS::PropertyID::Right, zero_value, containing_block.width());
@ -402,18 +399,18 @@ void LayoutBlock::compute_position()
box_model().padding().top = style.length_or_fallback(CSS::PropertyID::PaddingTop, zero_value, containing_block.width());
box_model().padding().bottom = style.length_or_fallback(CSS::PropertyID::PaddingBottom, zero_value, containing_block.width());
float position_x = box_model().margin().left.to_px()
+ box_model().border().left.to_px()
+ box_model().padding().left.to_px()
+ box_model().offset().left.to_px();
float position_x = box_model().margin().left.to_px(*this)
+ box_model().border().left.to_px(*this)
+ box_model().padding().left.to_px(*this)
+ box_model().offset().left.to_px(*this);
if (style.position() != CSS::Position::Absolute || containing_block.style().position() == CSS::Position::Absolute)
position_x += containing_block.x();
rect().set_x(position_x);
float position_y = box_model().full_margin().top
+ box_model().offset().top.to_px();
float position_y = box_model().full_margin(*this).top
+ box_model().offset().top.to_px(*this);
if (style.position() != CSS::Position::Absolute || containing_block.style().position() == CSS::Position::Absolute) {
LayoutBlock* relevant_sibling = previous_sibling();
@ -429,7 +426,7 @@ void LayoutBlock::compute_position()
auto& previous_sibling_rect = relevant_sibling->rect();
auto& previous_sibling_style = relevant_sibling->box_model();
position_y += previous_sibling_rect.y() + previous_sibling_rect.height();
position_y += previous_sibling_style.full_margin().bottom;
position_y += previous_sibling_style.full_margin(*this).bottom;
}
}
@ -441,7 +438,7 @@ void LayoutBlock::compute_height()
auto& style = this->style();
auto height = style.length_or_fallback(CSS::PropertyID::Height, Length(), containing_block()->height());
if (height.is_absolute())
rect().set_height(height.to_px());
rect().set_height(height.to_px(*this));
}
void LayoutBlock::render(RenderingContext& context)