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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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4
Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
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@ -268,7 +268,7 @@ Optional<int> StyleProperties::z_index() const
return {};
auto& value = maybe_value.value();
if (value->is_auto())
if (value->has_auto())
return 0;
if (value->is_numeric())
return static_cast<int>(static_cast<NumericStyleValue&>(*value).value());
@ -339,7 +339,7 @@ Optional<CSS::FlexBasisData> StyleProperties::flex_basis() const
if (value.value()->is_identifier() && value.value()->to_identifier() == CSS::ValueID::Content)
return { { CSS::FlexBasis::Content, {} } };
if (value.value()->is_auto())
if (value.value()->has_auto())
return { { CSS::FlexBasis::Auto, {} } };
if (value.value()->is_length())