Source/WebCore/css/CSSStyleSheetObservableArray.h

/*
 * Copyright (C) 2022, 2023 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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#pragma once

#include "CSSStyleSheet.h"
#include "JSObservableArray.h"

namespace WebCore {

class ContainerNode;
template<typename> class ExceptionOr;

class CSSStyleSheetObservableArray : public JSC::ObservableArray {
public:
    static Ref<CSSStyleSheetObservableArray> create(ContainerNode& treeScope);

    ExceptionOr<void> setSheets(Vector<Ref<CSSStyleSheet>>&&);
    const Vector<Ref<CSSStyleSheet>>& sheets() const { return m_sheets; }

private:
    explicit CSSStyleSheetObservableArray(ContainerNode& treeScope);

    std::optional<Exception> shouldThrowWhenAddingSheet(const CSSStyleSheet&) const;

    // JSC::ObservableArray
    bool setValueAt(JSC::JSGlobalObject*, unsigned index, JSC::JSValue) final;
    void removeLast() final;
    JSC::JSValue valueAt(JSC::JSGlobalObject*, unsigned index) const final;
    unsigned length() const final { return m_sheets.size(); }
    void shrinkTo(unsigned) final;

    TreeScope* treeScope() const;

    void didAddSheet(CSSStyleSheet&);
    void willRemoveSheet(CSSStyleSheet&);

    WeakPtr<ContainerNode, WeakPtrImplWithEventTargetData> m_treeScope;
    Vector<Ref<CSSStyleSheet>> m_sheets;
};

} // namespace WebCore