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https://github.com/LadybirdBrowser/ladybird.git
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78e1defbfe
Previously, a QTimer was used to start processing of our event queue in the main Qt event loop. Unfortunately, QTimers are not thread-safe, and disallow starting of a timer from a different thread than it was created in. Instead, use a dummy QObject to post a custom QEvent to the main loop from whatever thread we like, and process our event queue when it is received by our dummy object.
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/*
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* Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/OwnPtr.h>
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#include <LibCore/EventLoopImplementation.h>
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#include <QEvent>
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#include <QEventLoop>
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#include <QSocketNotifier>
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#include <QTimer>
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namespace Ladybird {
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class EventLoopImplementationQtEventTarget;
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class EventLoopManagerQt final : public Core::EventLoopManager {
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public:
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EventLoopManagerQt();
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virtual ~EventLoopManagerQt() override;
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virtual NonnullOwnPtr<Core::EventLoopImplementation> make_implementation() override;
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virtual int register_timer(Core::Object&, int milliseconds, bool should_reload, Core::TimerShouldFireWhenNotVisible) override;
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virtual bool unregister_timer(int timer_id) override;
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virtual void register_notifier(Core::Notifier&) override;
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virtual void unregister_notifier(Core::Notifier&) override;
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virtual void did_post_event() override;
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static bool event_target_received_event(Badge<EventLoopImplementationQtEventTarget>, QEvent* event);
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// FIXME: These APIs only exist for obscure use-cases inside SerenityOS. Try to get rid of them.
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virtual int register_signal(int, Function<void(int)>) override { return 0; }
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virtual void unregister_signal(int) override { }
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private:
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NonnullOwnPtr<EventLoopImplementationQtEventTarget> m_main_thread_event_target;
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};
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class QtEventLoopManagerEvent final : public QEvent {
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public:
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static QEvent::Type process_event_queue_event_type()
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{
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static auto const type = static_cast<QEvent::Type>(QEvent::registerEventType());
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return type;
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}
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QtEventLoopManagerEvent(QEvent::Type type)
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: QEvent(type)
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{
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}
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};
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class EventLoopImplementationQt final : public Core::EventLoopImplementation {
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public:
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static NonnullOwnPtr<EventLoopImplementationQt> create() { return adopt_own(*new EventLoopImplementationQt); }
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virtual ~EventLoopImplementationQt() override;
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virtual int exec() override;
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virtual size_t pump(PumpMode) override;
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virtual void quit(int) override;
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virtual void wake() override;
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virtual void post_event(Core::Object& receiver, NonnullOwnPtr<Core::Event>&&) override;
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// FIXME: These APIs only exist for obscure use-cases inside SerenityOS. Try to get rid of them.
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virtual void unquit() override { }
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virtual bool was_exit_requested() const override { return false; }
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virtual void notify_forked_and_in_child() override { }
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void set_main_loop() { m_main_loop = true; }
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private:
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friend class EventLoopManagerQt;
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EventLoopImplementationQt();
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bool is_main_loop() const { return m_main_loop; }
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QEventLoop m_event_loop;
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bool m_main_loop { false };
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};
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}
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