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LibWeb+WebContent+UI: Support image cursors

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The `cursor` property accepts a list of possible cursors, which behave
as a fallback: We use whichever cursor is the first available one. This
is a little complicated because initially, any remote images have not
loaded, so we need to use the fallback standard cursor, and then switch
to another when it loads.

So, ComputedValues stores a Vector of cursors, and then in EventHandler
we scan down that list until we find a cursor that's ready for use.

The spec defines cursors as being `<url>`, but allows for `<image>`
instead. That includes functions like `linear-gradient()`.

This commit implements image cursors in the Qt UI, but not AppKit.
This commit is contained in:
Sam Atkins
2025-02-20 12:17:29 +00:00
committed by Andreas Kling
parent fd2414ba35
commit bfd7ac1204
20 changed files with 297 additions and 170 deletions
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Libraries/LibWeb/CSS/Parser/Parser.h
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@@ -368,6 +368,7 @@ private:
RefPtr<CSSStyleValue> parse_counter_increment_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_counter_reset_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_counter_set_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_cursor_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_display_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_flex_shorthand_value(TokenStream<ComponentValue>&);
RefPtr<CSSStyleValue> parse_flex_flow_value(TokenStream<ComponentValue>&);