author Paul Adenot <>
Mon, 29 Oct 2018 17:38:19 +0100
changeset 444615 ecfc20c69e837d9119511d2cf5df01eada07e35c
parent 436012 037ca15f14dc7c59fc9a9f28f63ebcc356b17a81
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1502927 - Remove MediaStream.currentTime. r=baku,jib This has never been specced and is unused appart from our tests. Differential Revision:

/* -*- 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 */

 * ChildSHistory represents a view of session history from a child process. It
 * exposes getters for some cached history state, and mutators which are
 * implemented by communicating with the actual history storage in
 * ParentSHistory.
 * NOTE: Currently session history is in transition, meaning that we're still
 * using the legacy nsSHistory class internally. The API exposed from this class
 * should be only the API which we expect to expose when this transition is
 * complete, and special cases will need to call through the LegacySHistory()
 * getters.

#ifndef mozilla_dom_ChildSHistory_h
#define mozilla_dom_ChildSHistory_h

#include "nsCOMPtr.h"
#include "mozilla/ErrorResult.h"
#include "nsWrapperCache.h"

class nsSHistory;
class nsDocShell;
class nsISHistory;
class nsIWebNavigation;
class nsIGlobalObject;

namespace mozilla {
namespace dom {

class ParentSHistory;

class ChildSHistory
  : public nsISupports
  , public nsWrapperCache
  friend class ParentSHistory;

  nsISupports* GetParentObject() const;
  JSObject* WrapObject(JSContext* cx, JS::Handle<JSObject*> aGivenProto) override;

  explicit ChildSHistory(nsDocShell* aDocShell);

  int32_t Count();
  int32_t Index();

   * Reload the current entry in the session history.
  void Reload(uint32_t aReloadFlags, ErrorResult& aRv);

   * The CanGo and Go methods are called with an offset from the current index.
   * Positive numbers go forward in history, while negative numbers go
   * backwards.
  bool CanGo(int32_t aOffset);
  void Go(int32_t aOffset, ErrorResult& aRv);

   * Evicts all content viewers within the current process.
  void EvictLocalContentViewers();

  nsISHistory* LegacySHistory();

  ParentSHistory* GetParentIfSameProcess();

  virtual ~ChildSHistory();

  RefPtr<nsDocShell> mDocShell;
  RefPtr<nsSHistory> mHistory;

} // namespace dom
} // namespace mozilla

#endif /* mozilla_dom_ChildSHistory_h */