78 lines
1.9 KiB
C++
78 lines
1.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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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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rpl::producer<> ObservableViewer(base::Observable<void> &observable) {
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return [&observable](const auto &consumer) {
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auto lifetime = rpl::lifetime();
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lifetime.make_state<base::Subscription>(
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observable.add_subscription([consumer]() {
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consumer.put_next({});
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}));
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return lifetime;
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};
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}
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} // namespace base
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