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LibWeb: Support two-value background-repeat

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The background-repeat value may be specified as either one- or two-value
identifiers (to be interpreted as horizontal and vertical repeat). This
adds two pseudo-properties, background-repeat-x and background-repeat-y,
to handle this. One-value identifiers are mapped to two-value in
accordance with the spec.
This commit is contained in:
Timothy Flynn 2021-04-05 12:05:35 -04:00 • committed by Andreas Kling
parent 0794d879f3
commit 5de0e0068c
12 changed files with 152 additions and 35 deletions
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71
Userland/Libraries/LibWeb/CSS/StyleResolver.cpp
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@ -229,6 +229,24 @@ static inline void set_property_border_style(StyleProperties& style, const Style
style.set_property(CSS::PropertyID::BorderLeftStyle, value);
}
static inline bool is_background_repeat_property(const StyleValue& value)
{
if (!value.is_identifier())
return false;
switch (value.to_identifier()) {
case CSS::ValueID::NoRepeat:
case CSS::ValueID::Repeat:
case CSS::ValueID::RepeatX:
case CSS::ValueID::RepeatY:
case CSS::ValueID::Round:
case CSS::ValueID::Space:
return true;
default:
return false;
}
}
static void set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, const StyleValue& value, DOM::Document& document, bool is_internally_generated_pseudo_property = false)
{
CSS::ParsingContext context(document);
@ -433,12 +451,22 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
if (values[0].is_color() && color_value_count == 1)
style.set_property(CSS::PropertyID::BackgroundColor, values[0]);
for (auto& value : values) {
if (value.is_identifier())
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeat, value, document);
for (auto it = values.begin(); it != values.end(); ++it) {
auto& value = *it;
if (is_background_repeat_property(value)) {
if ((it + 1 != values.end()) && is_background_repeat_property(*(it + 1))) {
++it;
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatX, value, document, true);
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatY, *it, document, true);
} else {
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeat, value, document);
}
}
if (!value.is_string())
continue;
auto string = value.to_string();
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundImage, value, document);
}
return;
@ -464,7 +492,40 @@ static void set_property_expanding_shorthands(StyleProperties& style, CSS::Prope
}
if (property_id == CSS::PropertyID::BackgroundRepeat) {
style.set_property(CSS::PropertyID::BackgroundRepeat, value);
auto parts = split_on_whitespace(value.to_string());
NonnullRefPtrVector<StyleValue> values;
for (auto& part : parts) {
auto value = parse_css_value(context, part);
if (!value || !is_background_repeat_property(*value))
return;
values.append(value.release_nonnull());
}
if (values.size() == 1) {
auto value_id = values[0].to_identifier();
if (value_id == CSS::ValueID::RepeatX || value_id == CSS::ValueID::RepeatY) {
auto repeat_x = IdentifierStyleValue::create(value_id == CSS::ValueID::RepeatX ? CSS::ValueID::Repeat : CSS::ValueID::NoRepeat);
auto repeat_y = IdentifierStyleValue::create(value_id == CSS::ValueID::RepeatX ? CSS::ValueID::NoRepeat : CSS::ValueID::Repeat);
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatX, repeat_x, document, true);
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatY, repeat_y, document, true);
} else {
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatX, values[0], document, true);
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatY, values[0], document, true);
}
} else if (values.size() == 2) {
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatX, values[0], document, true);
set_property_expanding_shorthands(style, CSS::PropertyID::BackgroundRepeatY, values[1], document, true);
}
return;
}
if (property_id == CSS::PropertyID::BackgroundRepeatX || property_id == CSS::PropertyID::BackgroundRepeatY) {
auto value_id = value.to_identifier();
if (value_id == CSS::ValueID::RepeatX || value_id == CSS::ValueID::RepeatY)
return;
style.set_property(property_id, value);
return;
}