/* -*- 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 "mozilla/StyleBackendType.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(StyleBackendType aType, 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> mGecko;
  RefPtr<StyleSheet> mServo;
 
  bool mLoaded;
  nsCOMPtr<nsIURI> mURI;
  css::SheetParsingMode mParsingMode;
};
 
}  // namespace mozilla
 
#endif  // mozilla_PreloadedStyleSheet_h