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d9f12da712
As FontFaces are added or removed from a FontFaceSet, and as they load or fail, the FontFaceSet moves them between a few different lists, and updates its loading/loaded status. In the spec, this is how the FontFaceSet.[[ReadyPromise]] gets fulfilled: When the document has finished loading and FontFaceSet.[[LoadingFonts]] is empty, it resolves the promise. To support this, FontFace now keeps a set of FontFaceSets that it is contained in. This lets us remove the non-spec resolve_ready_promise() call in EventLoop which was sometimes triggering before any fonts had attempted to load. As noted, there's a spec issue with the ready promise: If nothing modifies the document's fonts, then it would never resolve. My ad-hoc fix is to also switch the FontFaceSet to the loaded state if it is empty, which appears to solve the issues but is not ideal.
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/*
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* Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
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* Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Runtime/Set.h>
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#include <LibJS/Runtime/SetIterator.h>
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#include <LibWeb/Bindings/FontFaceSetPrototype.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/CSS/FontFace.h>
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#include <LibWeb/DOM/EventTarget.h>
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namespace Web::CSS {
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class FontFaceSet final : public DOM::EventTarget {
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WEB_PLATFORM_OBJECT(FontFaceSet, DOM::EventTarget);
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GC_DECLARE_ALLOCATOR(FontFaceSet);
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public:
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[[nodiscard]] static GC::Ref<FontFaceSet> create(JS::Realm&);
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virtual ~FontFaceSet() override = default;
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GC::Ref<JS::Set> set_entries() const { return m_set_entries; }
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WebIDL::ExceptionOr<GC::Ref<FontFaceSet>> add(GC::Root<FontFace>);
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bool delete_(GC::Root<FontFace>);
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void clear();
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void add_css_connected_font(GC::Ref<FontFace>);
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void set_onloading(WebIDL::CallbackType*);
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WebIDL::CallbackType* onloading();
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void set_onloadingdone(WebIDL::CallbackType*);
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WebIDL::CallbackType* onloadingdone();
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void set_onloadingerror(WebIDL::CallbackType*);
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WebIDL::CallbackType* onloadingerror();
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JS::ThrowCompletionOr<GC::Ref<WebIDL::Promise>> load(String const& font, String const& text);
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Vector<GC::Ref<FontFace>>& loading_fonts() { return m_loading_fonts; }
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Vector<GC::Ref<FontFace>>& loaded_fonts() { return m_loaded_fonts; }
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Vector<GC::Ref<FontFace>>& failed_fonts() { return m_failed_fonts; }
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GC::Ref<WebIDL::Promise> ready() const;
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Bindings::FontFaceSetLoadStatus status() const { return m_status; }
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void on_set_modified_from_js(Badge<Bindings::FontFaceSetPrototype>) { }
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void fire_a_font_load_event(FlyString name, Vector<GC::Ref<FontFace>> = {});
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void set_is_pending_on_the_environment(bool);
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void switch_to_loading();
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void switch_to_loaded();
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private:
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explicit FontFaceSet(JS::Realm&);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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GC::Ref<JS::Set> m_set_entries;
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GC::Ref<WebIDL::Promise> m_ready_promise; // [[ReadyPromise]]
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Vector<GC::Ref<FontFace>> m_loading_fonts {}; // [[LoadingFonts]]
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Vector<GC::Ref<FontFace>> m_loaded_fonts {}; // [[LoadedFonts]]
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Vector<GC::Ref<FontFace>> m_failed_fonts {}; // [[FailedFonts]]
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Bindings::FontFaceSetLoadStatus m_status { Bindings::FontFaceSetLoadStatus::Loaded };
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bool m_is_pending_on_the_environment { true };
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// https://drafts.csswg.org/css-font-loading/#fontfaceset-stuck-on-the-environment
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bool m_is_stuck_on_the_environment { false };
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};
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}
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