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63c8e0660c
Differential Revision: https://phabricator.services.mozilla.com/D21130 --HG-- extra : rebase_source : 83867879cf33ddd2cc1b19c20dff8cef6a51d1a9 extra : histedit_source : 67979b7a263223c1e48421f382ed1e78d6264cf9
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/widget/nsAutoRollup.h"
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namespace mozilla {
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namespace widget {
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/*static*/
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uint32_t nsAutoRollup::sCount = 0;
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/*static*/
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StaticRefPtr<nsIContent> nsAutoRollup::sLastRollup;
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nsAutoRollup::nsAutoRollup() {
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// remember if sLastRollup was null, and only clear it upon destruction
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// if so. This prevents recursive usage of nsAutoRollup from clearing
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// sLastRollup when it shouldn't.
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mWasClear = !sLastRollup;
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sCount++;
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}
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nsAutoRollup::nsAutoRollup(nsIContent* aRollup) {
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MOZ_ASSERT(!sLastRollup);
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mWasClear = true;
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sCount++;
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SetLastRollup(aRollup);
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}
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nsAutoRollup::~nsAutoRollup() {
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if (sLastRollup && mWasClear) {
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sLastRollup = nullptr;
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}
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sCount--;
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}
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/*static*/
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void nsAutoRollup::SetLastRollup(nsIContent* aLastRollup) {
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// There must be at least one nsAutoRollup on the stack.
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MOZ_ASSERT(sCount);
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sLastRollup = aLastRollup;
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}
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/*static*/
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nsIContent* nsAutoRollup::GetLastRollup() { return sLastRollup.get(); }
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} // namespace widget
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} // namespace mozilla
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