afb81b8278
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112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include "base/integration.h"
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#include <rpl/rpl.h>
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#include <QtCore/QCoreApplication>
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#include <QtCore/QPointer>
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namespace base {
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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 qt_signal_producer(Object *object, Signal signal);
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namespace details {
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template <typename Signal>
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struct qt_signal_argument;
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template <
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typename Class,
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typename Return,
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typename Value1,
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typename Value2,
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typename ...Other>
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struct qt_signal_argument<Return(Class::*)(Value1, Value2, Other...)> {
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using type = std::tuple<Value1, Value2, Other...>;
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static constexpr bool none = false;
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static constexpr bool one = false;
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};
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template <typename Class, typename Return, typename Value>
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struct qt_signal_argument<Return(Class::*)(Value)> {
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using type = Value;
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static constexpr bool none = false;
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static constexpr bool one = true;
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};
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template <typename Class, typename Return>
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struct qt_signal_argument<Return(Class::*)()> {
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using type = void;
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static constexpr bool none = true;
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static constexpr bool one = false;
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};
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} // namespace details
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template <typename Object, typename Signal>
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auto qt_signal_producer(Object *object, Signal signal) {
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using Value = typename details::qt_signal_argument<Signal>::type;
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static constexpr auto None = details::qt_signal_argument<Signal>::none;
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static constexpr auto One = details::qt_signal_argument<Signal>::one;
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using Produced = std::conditional_t<
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None,
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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 = QPointer<Object>(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 = QPointer<QObject>(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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if (QCoreApplication::instance()) {
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Integration::Instance().enterFromEventLoop([&] {
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consumer.put_next_copy(value);
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});
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} else {
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consumer.put_next_copy(value);
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}
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};
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if constexpr (None) {
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return connect([put = std::move(put)] { put({}); });
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} else if constexpr (One) {
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return connect(std::move(put));
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} else {
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return connect([put = std::move(put)](auto &&...args) {
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put(std::make_tuple(std::forward<decltype(args)>(args)...));
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});
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}
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});
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}
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} // namespace base
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