/src/mozilla-central/widget/nsAutoRollup.cpp
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1 | | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
3 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
4 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
5 | | |
6 | | #include "mozilla/widget/nsAutoRollup.h" |
7 | | |
8 | | namespace mozilla { |
9 | | namespace widget { |
10 | | |
11 | | /*static*/ uint32_t nsAutoRollup::sCount = 0; |
12 | | /*static*/ StaticRefPtr<nsIContent> nsAutoRollup::sLastRollup; |
13 | | |
14 | | nsAutoRollup::nsAutoRollup() |
15 | 0 | { |
16 | 0 | // remember if sLastRollup was null, and only clear it upon destruction |
17 | 0 | // if so. This prevents recursive usage of nsAutoRollup from clearing |
18 | 0 | // sLastRollup when it shouldn't. |
19 | 0 | mWasClear = !sLastRollup; |
20 | 0 | sCount++; |
21 | 0 | } |
22 | | |
23 | | nsAutoRollup::nsAutoRollup(nsIContent* aRollup) |
24 | 0 | { |
25 | 0 | MOZ_ASSERT(!sLastRollup); |
26 | 0 | mWasClear = true; |
27 | 0 | sCount++; |
28 | 0 | SetLastRollup(aRollup); |
29 | 0 | } |
30 | | |
31 | | nsAutoRollup::~nsAutoRollup() |
32 | 0 | { |
33 | 0 | if (sLastRollup && mWasClear) { |
34 | 0 | sLastRollup = nullptr; |
35 | 0 | } |
36 | 0 | sCount--; |
37 | 0 | } |
38 | | |
39 | | /*static*/ void |
40 | | nsAutoRollup::SetLastRollup(nsIContent* aLastRollup) |
41 | 0 | { |
42 | 0 | // There must be at least one nsAutoRollup on the stack. |
43 | 0 | MOZ_ASSERT(sCount); |
44 | 0 |
|
45 | 0 | sLastRollup = aLastRollup; |
46 | 0 | } |
47 | | |
48 | | /*static*/ nsIContent* |
49 | | nsAutoRollup::GetLastRollup() |
50 | 0 | { |
51 | 0 | return sLastRollup.get(); |
52 | 0 | } |
53 | | |
54 | | } // namespace widget |
55 | | } // namespace mozilla |