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/* -*- 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
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