80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "base/observer.h"
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namespace base {
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namespace internal {
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namespace {
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bool CantUseObservables = false;
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struct ObservableListWrap {
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~ObservableListWrap() {
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CantUseObservables = true;
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}
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OrderedSet<ObservableCallHandlers*> list;
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};
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ObservableListWrap &PendingObservables() {
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static ObservableListWrap result;
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return result;
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}
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ObservableListWrap &ActiveObservables() {
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static ObservableListWrap result;
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return result;
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}
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} // namespace
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void RegisterPendingObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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PendingObservables().list.insert(handlers);
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Global::RefHandleObservables().call();
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}
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void UnregisterActiveObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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ActiveObservables().list.remove(handlers);
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}
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void UnregisterObservable(ObservableCallHandlers *handlers) {
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if (CantUseObservables) return;
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PendingObservables().list.remove(handlers);
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ActiveObservables().list.remove(handlers);
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}
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} // namespace internal
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void HandleObservables() {
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if (internal::CantUseObservables) return;
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auto &active = internal::ActiveObservables().list;
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qSwap(active, internal::PendingObservables().list);
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while (!active.empty()) {
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auto first = *active.begin();
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(*first)();
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if (!active.empty() && *active.begin() == first) {
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active.erase(active.begin());
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}
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}
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}
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} // namespace base
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