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LibWeb: Clarify StyleValue API with new naming scheme

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This does a few things, that are hard to separate. For a while now, it's
been confuzing what `StyleValue::is_foo()` actually means. It sometimes
was used to check the type, and sometimes to see if it could return a
certain value type. The new naming scheme is:

- `is_length()` - is it a LengthStyleValue?
- `as_length()` - casts it to LengthStyleValue
- `has_length()` - can it return a Length?
- `to_length()` - gets the internal value out (eg, Length)

This also means, no more `static_cast<LengthStyleValue const&>(*this)`
stuff when dealing with StyleValues. :^)

Hopefully this will be a bit clearer going forward. There are lots of
places using the original methods, so I'll be going through them to
hopefully catch any issues.
This commit is contained in:
Sam Atkins 2021-09-23 19:54:19 +01:00 • committed by Andreas Kling
parent 1ae0781ce1
commit 4b554ba92a
6 changed files with 263 additions and 60 deletions
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10
Meta/Lagom/Tools/CodeGenerators/LibWeb/Generate_CSS_PropertyID_cpp.cpp
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@ -284,7 +284,7 @@ bool property_accepts_value(PropertyID property_id, StyleValue& style_value)
auto type_args = type_parts.size() > 1 ? type_parts[1] : ""sv;
if (type_name == "color") {
property_generator.append(R"~~~(
if (style_value.is_color())
if (style_value.has_color())
return true;
)~~~");
} else if (type_name == "image") {
@ -295,7 +295,7 @@ bool property_accepts_value(PropertyID property_id, StyleValue& style_value)
} else if (type_name == "length" || type_name == "percentage") {
// FIXME: Handle lengths and percentages separately
property_generator.append(R"~~~(
if (style_value.is_length() || style_value.is_calculated())
if (style_value.has_length() || style_value.is_calculated())
return true;
)~~~");
} else if (type_name == "number" || type_name == "integer") {
@ -309,14 +309,14 @@ bool property_accepts_value(PropertyID property_id, StyleValue& style_value)
max_value = type_args.substring_view(comma_index + 1, type_args.length() - comma_index - 2);
}
property_generator.append(R"~~~(
if (style_value.is_numeric())~~~");
if (style_value.has_number())~~~");
if (!min_value.is_empty()) {
property_generator.set("minvalue", min_value);
property_generator.append(" && (style_value.as_number() >= (float)@minvalue@)");
property_generator.append(" && (style_value.to_number() >= (float)@minvalue@)");
}
if (!max_value.is_empty()) {
property_generator.set("maxvalue", max_value);
property_generator.append(" && (style_value.as_number() <= (float)@maxvalue@)");
property_generator.append(" && (style_value.to_number() <= (float)@maxvalue@)");
}
property_generator.append(R"~~~()
return true;