widget/nsAutoRollup.cpp
author Sylvestre Ledru <sledru@mozilla.com>
Fri, 30 Nov 2018 11:46:48 +0100
changeset 448947 6f3709b3878117466168c40affa7bca0b60cf75b
parent 347695 40479d157fc874df89dd7b7f959f761319aece49
child 461801 0707c5d273227aed4fb04a8f6360875165f83ddd
permissions -rw-r--r--
Bug 1511181 - Reformat everything to the Google coding style r=ehsan a=clang-format # ignore-this-changeset

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "mozilla/widget/nsAutoRollup.h"

namespace mozilla {
namespace widget {

/*static*/ uint32_t nsAutoRollup::sCount = 0;
/*static*/ StaticRefPtr<nsIContent> nsAutoRollup::sLastRollup;

nsAutoRollup::nsAutoRollup() {
  // remember if sLastRollup was null, and only clear it upon destruction
  // if so. This prevents recursive usage of nsAutoRollup from clearing
  // sLastRollup when it shouldn't.
  mWasClear = !sLastRollup;
  sCount++;
}

nsAutoRollup::nsAutoRollup(nsIContent* aRollup) {
  MOZ_ASSERT(!sLastRollup);
  mWasClear = true;
  sCount++;
  SetLastRollup(aRollup);
}

nsAutoRollup::~nsAutoRollup() {
  if (sLastRollup && mWasClear) {
    sLastRollup = nullptr;
  }
  sCount--;
}

/*static*/ void nsAutoRollup::SetLastRollup(nsIContent* aLastRollup) {
  // There must be at least one nsAutoRollup on the stack.
  MOZ_ASSERT(sCount);

  sLastRollup = aLastRollup;
}

/*static*/ nsIContent* nsAutoRollup::GetLastRollup() {
  return sLastRollup.get();
}

}  // namespace widget
}  // namespace mozilla