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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
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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9
Libraries/LibWebView/WebContentClient.cpp
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@ -123,16 +123,11 @@ void WebContentClient::did_request_refresh(u64 page_id)
view->reload();
}
void WebContentClient::did_request_cursor_change(u64 page_id, i32 cursor_type)
void WebContentClient::did_request_cursor_change(u64 page_id, Gfx::Cursor const& cursor)
{
if (cursor_type < 0 || cursor_type >= (i32)Gfx::StandardCursor::__Count) {
dbgln("DidRequestCursorChange: Bad cursor type");
return;
}
if (auto view = view_for_page_id(page_id); view.has_value()) {
if (view->on_cursor_change)
view->on_cursor_change(static_cast<Gfx::StandardCursor>(cursor_type));
view->on_cursor_change(cursor);
}
}