gecko-dev/widget/nsAutoRollup.cpp

56 строки
1.3 KiB
C++
Исходник Обычный вид История

/* -*- 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