layout/generic/nsIStatefulFrame.h
author Brian Hackett <bhackett1024@gmail.com>
Wed, 14 Nov 2018 16:09:58 -1000
changeset 446931 1c7fc8389e012c987347efefca6b35f3948b742a
parent 412751 f394ca4f80af5fd29edab09afc6893112c808b15
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1507359 Part 2 - Bindings and internal changes to allow ReplayDebugger to control child pausing/resuming, r=mccr8.

/* -*- 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,
                              nsIDocument* aDocument,
                              nsACString& aKey)
  {
    return nsContentUtils::GenerateStateKey(aContent, aDocument, aKey);
  };
};

#endif /* _nsIStatefulFrame_h */