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LibWeb: Calculate width property resolved value correctly

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This means that relative width values are now correctly resolved when
calling `getComputedStyle()`.
This commit is contained in:
Tim Ledbetter 2024-05-06 23:29:21 +01:00 • committed by Andreas Kling
parent 7d192ed8c1
commit 0b0ad5c9db
4 changed files with 50 additions and 13 deletions
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2
Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt
View file

@ -175,7 +175,7 @@ user-select: auto
vertical-align: baseline
visibility: visible
white-space: normal
width: auto
width: 784px
word-spacing: normal
word-wrap: normal
x: 0px

2
Tests/LibWeb/Text/expected/css/getComputedStyle-relative-property-values.txt Normal file
View file

@ -0,0 +1,2 @@
height: 4px
width: 5px

26
Tests/LibWeb/Text/input/css/getComputedStyle-relative-property-values.html Normal file
View file

@ -0,0 +1,26 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<style>
#outer {
width: 10px;
height: 20px;
}
#inner {
width: 50%;
height: 20%;
}
</style>
<div id="outer"><div id="inner"></div></div>
<script>
test(() => {
const inner = document.getElementById("inner");
const style = getComputedStyle(inner);
const propertyValues = [
"height",
"width",
];
for (const property of propertyValues) {
println(`${property}: ${style.getPropertyValue(property)}`);
}
});
</script>

33
Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
View file

@ -196,6 +196,18 @@ static RefPtr<StyleValue const> style_value_for_shadow(Vector<ShadowData> const&
RefPtr<StyleValue const> ResolvedCSSStyleDeclaration::style_value_for_property(Layout::NodeWithStyle const& layout_node, PropertyID property_id) const
{
auto used_value_for_property = [&layout_node](Function<CSSPixels(Painting::PaintableBox const&)>&& used_value_getter) -> Optional<CSSPixels> {
auto const& display = layout_node.computed_values().display();
if (!display.is_none() && !display.is_contents() && layout_node.paintable()) {
if (layout_node.paintable()->is_paintable_box()) {
auto const& paintable_box = static_cast<Painting::PaintableBox const&>(*layout_node.paintable());
return used_value_getter(paintable_box);
}
dbgln("FIXME: Support getting used value for ({})", layout_node.debug_description());
}
return {};
};
// A limited number of properties have special rules for producing their "resolved value".
// We also have to manually construct shorthands from their longhands here.
// Everything else uses the computed value.
@ -269,20 +281,13 @@ RefPtr<StyleValue const> ResolvedCSSStyleDeclaration::style_value_for_property(L
// -> padding-right
// -> padding-top
// -> width
// -> A resolved value special case property like height defined in another specification
case PropertyID::Height: {
// If the property applies to the element or pseudo-element and the resolved value of the
// display property is not none or contents, then the resolved value is the used value.
// Otherwise the resolved value is the computed value.
auto const& display = layout_node.computed_values().display();
if (!display.is_none() && !display.is_contents() && layout_node.paintable()) {
if (layout_node.paintable()->is_paintable_box()) {
auto const& paintable_box = static_cast<Painting::PaintableBox const&>(*layout_node.paintable());
auto const used_height = paintable_box.content_height();
return style_value_for_size(Size::make_px(used_height));
}
dbgln("FIXME: Support getting used height for ({})", layout_node.debug_description());
}
case PropertyID::Height: {
auto maybe_used_height = used_value_for_property([](auto const& paintable_box) { return paintable_box.content_height(); });
if (maybe_used_height.has_value())
return style_value_for_size(Size::make_px(maybe_used_height.release_value()));
return style_value_for_size(layout_node.computed_values().height());
}
case PropertyID::MarginBlockEnd:
@ -317,8 +322,12 @@ RefPtr<StyleValue const> ResolvedCSSStyleDeclaration::style_value_for_property(L
return style_value_for_length_percentage(layout_node.computed_values().padding().right());
case PropertyID::PaddingTop:
return style_value_for_length_percentage(layout_node.computed_values().padding().top());
case PropertyID::Width:
case PropertyID::Width: {
auto maybe_used_width = used_value_for_property([](auto const& paintable_box) { return paintable_box.content_width(); });
if (maybe_used_width.has_value())
return style_value_for_size(Size::make_px(maybe_used_width.release_value()));
return style_value_for_size(layout_node.computed_values().width());
}
// -> bottom
// -> left