layout/style/PreloadedStyleSheet.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* a CSS style sheet returned from nsIStyleSheetService.preloadSheet */
   8
   9 #ifndef mozilla_PreloadedStyleSheet_h
  10 #define mozilla_PreloadedStyleSheet_h
  11
  12 #include "mozilla/css/SheetParsingMode.h"
  13 #include "mozilla/NotNull.h"
  14 #include "mozilla/Result.h"
  15 #include "nsCOMPtr.h"
  16 #include "nsCycleCollectionParticipant.h"
  17 #include "nsICSSLoaderObserver.h"
  18 #include "nsIPreloadedStyleSheet.h"
  19
  20 class nsIURI;
  21
  22 namespace mozilla {
  23 namespace dom {
  24 class Promise;
  25 }
  26
  27 class StyleSheet;
  28
  29 class PreloadedStyleSheet : public nsIPreloadedStyleSheet {
  30  public:
  31   PreloadedStyleSheet(nsIURI*, css::SheetParsingMode);
  32
  33   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  34   NS_DECL_CYCLE_COLLECTION_CLASS(PreloadedStyleSheet)
  35
  36   // *aResult is not addrefed, since the PreloadedStyleSheet holds a strong
  37   // reference to the sheet.
  38   nsresult GetSheet(StyleSheet** aResult);
  39
  40   nsresult Preload();
  41   nsresult PreloadAsync(NotNull<dom::Promise*> aPromise);
  42
  43  protected:
  44   virtual ~PreloadedStyleSheet() = default;
  45
  46  private:
  47   class StylesheetPreloadObserver final : public nsICSSLoaderObserver {
  48    public:
  49     NS_DECL_ISUPPORTS
  50
  51     explicit StylesheetPreloadObserver(NotNull<dom::Promise*> aPromise,
  52                                        PreloadedStyleSheet* aSheet)
  53         : mPromise(aPromise), mPreloadedSheet(aSheet) {}
  54
  55     NS_IMETHOD StyleSheetLoaded(StyleSheet* aSheet, bool aWasDeferred,
  56                                 nsresult aStatus) override;
  57
  58    protected:
  59     virtual ~StylesheetPreloadObserver() = default;
  60
  61    private:
  62     RefPtr<dom::Promise> mPromise;
  63     RefPtr<PreloadedStyleSheet> mPreloadedSheet;
  64   };
  65
  66   RefPtr<StyleSheet> mSheet;
  67
  68   bool mLoaded;
  69   nsCOMPtr<nsIURI> mURI;
  70   css::SheetParsingMode mParsingMode;
  71 };
  72
  73 }  // namespace mozilla
  74
  75 #endif  // mozilla_PreloadedStyleSheet_h