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LibWeb: Implement the transition-behavior CSS property

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This specifies whether transitions should be started for transitions
whose animation behavior is discrete.
This commit is contained in:
Tim Ledbetter 2025-04-17 19:11:14 +01:00 • committed by Sam Atkins
parent e57e38dafc
commit 542c3cbe51
Notes: github-actions[bot] 2025-05-02 10:08:20 +00:00
20 changed files with 289 additions and 47 deletions
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16
Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
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@ -3724,7 +3724,7 @@ RefPtr<CSSStyleValue const> Parser::parse_transition_value(TokenStream<Component
while (tokens.has_next_token()) {
TransitionStyleValue::Transition transition;
auto time_value_count = 0;
bool transition_behavior_found = false;
while (tokens.has_next_token() && !tokens.next_token().is(Token::Type::Comma)) {
if (auto maybe_time = parse_time(tokens); maybe_time.has_value()) {
auto time = maybe_time.release_value();
@ -3757,6 +3757,14 @@ RefPtr<CSSStyleValue const> Parser::parse_transition_value(TokenStream<Component
continue;
}
if (!transition_behavior_found && (tokens.peek_token().is_ident("normal"sv) || tokens.peek_token().is_ident("allow-discrete"sv))) {
transition_behavior_found = true;
auto ident = tokens.consume_a_token().token().ident();
if (ident == "allow-discrete"sv)
transition.transition_behavior = TransitionBehavior::AllowDiscrete;
continue;
}
if (auto token = tokens.peek_token(); token.is_ident("all"sv)) {
auto transition_keyword = parse_keyword_value(tokens);
VERIFY(transition_keyword->to_keyword() == Keyword::All);
@ -3775,10 +3783,10 @@ RefPtr<CSSStyleValue const> Parser::parse_transition_value(TokenStream<Component
}
auto custom_ident = transition_property->custom_ident();
if (auto property = property_id_from_string(custom_ident); property.has_value())
if (auto property = property_id_from_string(custom_ident); property.has_value()) {
transition.property_name = CustomIdentStyleValue::create(custom_ident);
continue;
continue;
}
}
dbgln_if(CSS_PARSER_DEBUG, "Transition property has unexpected token \"{}\"", tokens.next_token().to_string());