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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
commit bfd7ac1204
Notes: github-actions[bot] 2025-02-28 12:51:27 +00:00
20 changed files with 297 additions and 170 deletions
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2
Libraries/LibWebView/ViewImplementation.h
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@ -194,7 +194,7 @@ public:
Function<void(URL::URL const&)> on_load_finish;
Function<void(ByteString const& path, i32)> on_request_file;
Function<void(Gfx::Bitmap const&)> on_favicon_change;
Function<void(Gfx::StandardCursor)> on_cursor_change;
Function<void(Gfx::Cursor const&)> on_cursor_change;
Function<void(Gfx::IntPoint, ByteString const&)> on_request_tooltip_override;
Function<void()> on_stop_tooltip_override;
Function<void(ByteString const&)> on_enter_tooltip_area;