nsFrameLoaderOwner.h

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/* -*- 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/. */

#ifndef nsFrameLoaderOwner_h_

#define nsFrameLoaderOwner_h_

#include <functional>

#include "nsFrameLoader.h"

#include "nsISupports.h"

namespace mozilla {

class ErrorResult;

namespace dom {

class BrowsingContext;

class BrowsingContextGroup;

class BrowserBridgeChild;

class ContentParent;

class Element;

struct RemotenessOptions;

struct NavigationIsolationOptions;

}  // namespace dom

}  // namespace mozilla

// IID for the FrameLoaderOwner interface

#define NS_FRAMELOADEROWNER_IID                      \

  {                                                  \

    0x1b4fd25c, 0x2e57, 0x11e9, {                    \

      0x9e, 0x5a, 0x5b, 0x86, 0xe9, 0x89, 0xa5, 0xc0 \

    }                                                \

// Mixin that handles ownership of nsFrameLoader for Frame elements

// (XULFrameElement, HTMLI/FrameElement, etc...). Manages information when doing

// FrameLoader swaps.

//

// This class is considered an XPCOM mixin. This means that while we inherit

// from ISupports in order to be QI'able, we expect the classes that inherit

// nsFrameLoaderOwner to actually implement ISupports for us.

class nsFrameLoaderOwner : public nsISupports {

 public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_FRAMELOADEROWNER_IID)

  nsFrameLoaderOwner() = default;

  already_AddRefed<nsFrameLoader> GetFrameLoader();

  void SetFrameLoader(nsFrameLoader* aNewFrameLoader);

  mozilla::dom::BrowsingContext* GetBrowsingContext();

  mozilla::dom::BrowsingContext* GetExtantBrowsingContext();

  // Destroy (if it exists) and recreate our frameloader, based on new

  // remoteness requirements.

//

  // This method is called by frontend code when it wants to perform a

  // remoteness update, and allows for behaviour such as preserving

  // BrowsingContexts across process switches during navigation.

//

  // See the WebIDL definition for more details.

  void ChangeRemoteness(const mozilla::dom::RemotenessOptions& aOptions,

                        mozilla::ErrorResult& rv);

  // Like `ChangeRemoteness` but switches to an already-created

  // `BrowserBridgeChild`. This method is used when performing remote subframe

  // process switches.

  void ChangeRemotenessWithBridge(mozilla::dom::BrowserBridgeChild* aBridge,

                                  mozilla::ErrorResult& rv);

  // Like `ChangeRemoteness`, but switches into an already-created

  // `ContentParent`. This method is used when performing toplevel process

  // switches. If `aContentParent` is nullptr, switches into the parent process.

//

  // If `aReplaceBrowsingContext` is set, BrowsingContext preservation will be

  // disabled for this process switch.

  void ChangeRemotenessToProcess(

      mozilla::dom::ContentParent* aContentParent,

      const mozilla::dom::NavigationIsolationOptions& aOptions,

      mozilla::dom::BrowsingContextGroup* aGroup, mozilla::ErrorResult& rv);

  void SubframeCrashed();

  void RestoreFrameLoaderFromBFCache(nsFrameLoader* aNewFrameLoader);

  void UpdateFocusAndMouseEnterStateAfterFrameLoaderChange();

  void AttachFrameLoader(nsFrameLoader* aFrameLoader);

  void DetachFrameLoader(nsFrameLoader* aFrameLoader);

  // If aDestroyBFCached is true and aFrameLoader is the current frameloader

  // (mFrameLoader) then this will also call nsFrameLoader::Destroy on all the

  // other frame loaders in mFrameLoaderList and remove them from the list.

  void FrameLoaderDestroying(nsFrameLoader* aFrameLoader,

                             bool aDestroyBFCached);

 private:

  bool UseRemoteSubframes();

  // The enum class for determine how to handle previous BrowsingContext during

  // the change remoteness. It could be followings

  // 1. DONT_PRESERVE

  //    Create a whole new BrowsingContext.

  // 2. PRESERVE

  //    Preserve the previous BrowsingContext.

  enum class ChangeRemotenessContextType {

    DONT_PRESERVE = 0,

    PRESERVE = 1,

};

  ChangeRemotenessContextType ShouldPreserveBrowsingContext(

      bool aIsRemote, bool aReplaceBrowsingContext);

  void ChangeRemotenessCommon(

      const ChangeRemotenessContextType& aContextType,

      const mozilla::dom::NavigationIsolationOptions& aOptions,

      bool aSwitchingInProgressLoad, bool aIsRemote,

      mozilla::dom::BrowsingContextGroup* aGroup,

      std::function<void()>& aFrameLoaderInit, mozilla::ErrorResult& aRv);

  void ChangeFrameLoaderCommon(mozilla::dom::Element* aOwner,

                               bool aRetainPaint);

  void UpdateFocusAndMouseEnterStateAfterFrameLoaderChange(

      mozilla::dom::Element* aOwner);

 protected:

  virtual ~nsFrameLoaderOwner() = default;

  RefPtr<nsFrameLoader> mFrameLoader;

  // The list contains all the nsFrameLoaders created for this owner or moved

  // from another nsFrameLoaderOwner which haven't been destroyed yet.

  // In particular it contains all the nsFrameLoaders which are in bfcache.

  mozilla::LinkedList<nsFrameLoader> mFrameLoaderList;

};

NS_DEFINE_STATIC_IID_ACCESSOR(nsFrameLoaderOwner, NS_FRAMELOADEROWNER_IID)

#endif  // nsFrameLoaderOwner_h_