/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* a CSS style sheet returned from nsIStyleSheetService.preloadSheet */

#ifndef mozilla_PreloadedStyleSheet_h

#define mozilla_PreloadedStyleSheet_h

#include "mozilla/css/SheetParsingMode.h"

#include "mozilla/NotNull.h"

#include "mozilla/Result.h"

#include "nsCOMPtr.h"

#include "nsCycleCollectionParticipant.h"

#include "nsICSSLoaderObserver.h"

#include "nsIPreloadedStyleSheet.h"

class nsIURI;

namespace mozilla {

namespace dom {

  class Promise;

}

class StyleSheet;

class PreloadedStyleSheet : public nsIPreloadedStyleSheet

{

public:

  // *aResult is addrefed.

  static nsresult Create(nsIURI* aURI, css::SheetParsingMode aParsingMode,

                         PreloadedStyleSheet** aResult);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_CLASS(PreloadedStyleSheet)

  // *aResult is not addrefed, since the PreloadedStyleSheet holds a strong

  // reference to the sheet.

  nsresult GetSheet(StyleSheet** aResult);

  nsresult Preload();

  nsresult PreloadAsync(NotNull<dom::Promise*> aPromise);

protected:

  virtual ~PreloadedStyleSheet() {}

private:

  PreloadedStyleSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode);

  class StylesheetPreloadObserver final : public nsICSSLoaderObserver

  {

  public:

    NS_DECL_ISUPPORTS

    explicit StylesheetPreloadObserver(NotNull<dom::Promise*> aPromise,

                                       PreloadedStyleSheet* aSheet)

      : mPromise(aPromise)

      , mPreloadedSheet(aSheet)

    {}

    NS_IMETHOD StyleSheetLoaded(StyleSheet* aSheet,

                                bool aWasAlternate,

                                nsresult aStatus) override;

  protected:

    virtual ~StylesheetPreloadObserver() {}

  private:

    RefPtr<dom::Promise> mPromise;

    RefPtr<PreloadedStyleSheet> mPreloadedSheet;

  };

  RefPtr<StyleSheet> mSheet;

  bool mLoaded;

  nsCOMPtr<nsIURI> mURI;

  css::SheetParsingMode mParsingMode;

};

} // namespace mozilla

#endif // mozilla_PreloadedStyleSheet_h