82 lines
2.2 KiB
C++
82 lines
2.2 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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#pragma once
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#include "core/sandbox.h"
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namespace Core {
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// This method allows to create an rpl::producer from a Qt object
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// and a signal with none or one reported value.
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//
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// QtSignalProducer(qtWindow, &QWindow::activeChanged) | rpl::start_
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//
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// This producer values construct a custom event loop leave point.
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// This means that all postponeCall's will be invoked right after
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// the value processing by the current consumer finishes.
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template <typename Object, typename Signal>
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auto QtSignalProducer(Object *object, Signal signal);
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namespace details {
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template <typename Signal>
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struct QtSignalArgument;
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template <typename Class, typename Return, typename Value>
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struct QtSignalArgument<Return(Class::*)(Value)> {
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using type = Value;
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};
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template <typename Class, typename Return>
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struct QtSignalArgument<Return(Class::*)()> {
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using type = void;
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};
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} // namespace details
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template <typename Object, typename Signal>
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auto QtSignalProducer(Object *object, Signal signal) {
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using Value = typename details::QtSignalArgument<Signal>::type;
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static constexpr auto NoArgument = std::is_same_v<Value, void>;
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using Produced = std::conditional_t<
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NoArgument,
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rpl::empty_value,
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std::remove_const_t<std::decay_t<Value>>>;
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const auto guarded = make_weak(object);
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return rpl::make_producer<Produced>([=](auto consumer) {
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if (!guarded) {
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return rpl::lifetime();
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}
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const auto connect = [&](auto &&handler) {
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const auto listener = new QObject(guarded.data());
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QObject::connect(
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guarded,
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signal,
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listener,
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std::forward<decltype(handler)>(handler));
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const auto weak = make_weak(listener);
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return rpl::lifetime([=] {
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if (weak) {
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delete weak;
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}
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});
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};
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auto put = [=](const Produced &value) {
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Sandbox::Instance().customEnterFromEventLoop([&] {
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consumer.put_next_copy(value);
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});
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};
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if constexpr (NoArgument) {
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return connect([put = std::move(put)] { put({}); });
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} else {
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return connect(std::move(put));
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}
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});
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}
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} // namespace Core
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