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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
Services/WebContent/PageClient.h
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@ -114,7 +114,7 @@ private:
virtual Web::CSS::PreferredColorScheme preferred_color_scheme() const override { return m_preferred_color_scheme; }
virtual Web::CSS::PreferredContrast preferred_contrast() const override { return m_preferred_contrast; }
virtual Web::CSS::PreferredMotion preferred_motion() const override { return m_preferred_motion; }
virtual void page_did_request_cursor_change(Gfx::StandardCursor) override;
virtual void page_did_request_cursor_change(Gfx::Cursor const&) override;
virtual void page_did_layout() override;
virtual void page_did_change_title(ByteString const&) override;
virtual void page_did_change_url(URL::URL const&) override;