layout/generic/nsIStatefulFrame.h
author Boris Zbarsky <bzbarsky@mit.edu>
Sat, 11 May 2019 08:28:29 +0000
changeset 532359 6103006e3172f0ef258a30256b8cc7a6553e7f14
parent 509549 f0a91d36587266d7454a450c6044d573664fbed5
child 539889 dd6e7c0970d5a55be8f8ca98dd3b3af6267b5ea1
permissions -rw-r--r--
Bug 1550937. Stop using [array] in nsIEventListenerService. r=smaug Differential Revision: https://phabricator.services.mozilla.com/D30773

/* -*- 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/. */

/*
 * interface for rendering objects whose state is saved in
 * session-history (back-forward navigation)
 */

#ifndef _nsIStatefulFrame_h
#define _nsIStatefulFrame_h

#include "nsContentUtils.h"
#include "nsQueryFrame.h"

namespace mozilla {
class PresState;
}  // namespace mozilla

class nsIStatefulFrame {
 public:
  NS_DECL_QUERYFRAME_TARGET(nsIStatefulFrame)

  // Save the state for this frame.
  virtual mozilla::UniquePtr<mozilla::PresState> SaveState() = 0;

  // Restore the state for this frame from aState
  NS_IMETHOD RestoreState(mozilla::PresState* aState) = 0;

  // Generate a key for this stateful frame
  NS_IMETHOD GenerateStateKey(nsIContent* aContent,
                              mozilla::dom::Document* aDocument,
                              nsACString& aKey) {
    return nsContentUtils::GenerateStateKey(aContent, aDocument, aKey);
  };
};

#endif /* _nsIStatefulFrame_h */