LibWeb+WebContent: Add abstraction layer for event loop and timers

Instead of using Core::EventLoop and Core::Timer directly, LibWeb now
goes through a Web::Platform abstraction layer instead.

This will allow us to plug in Qt's event loop (and QTimer) over in
Ladybird, to avoid having to deal with multiple event loops.

Userland/Services/WebContent/CMakeLists.txt

@@ -10,11 +10,13 @@ compile_ipc(WebContentClient.ipc WebContentClientEndpoint.h)
 set(SOURCES
     ConnectionFromClient.cpp
     ConsoleGlobalObject.cpp
-    main.cpp
+    EventLoopPluginSerenity.cpp
     PageHost.cpp
+    TimerSerenity.cpp
+    WebContentClientEndpoint.h
     WebContentConsoleClient.cpp
     WebContentServerEndpoint.h
-    WebContentClientEndpoint.h
+    main.cpp
 )
 
 serenity_bin(WebContent)

Userland/Services/WebContent/EventLoopPluginSerenity.cpp

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "EventLoopPluginSerenity.h"
+#include "TimerSerenity.h"
+#include <AK/Function.h>
+#include <AK/NonnullRefPtr.h>
+#include <LibCore/EventLoop.h>
+
+namespace WebContent {
+
+EventLoopPluginSerenity::EventLoopPluginSerenity() = default;
+EventLoopPluginSerenity::~EventLoopPluginSerenity() = default;
+
+void EventLoopPluginSerenity::spin_until(Function<bool()> goal_condition)
+{
+    Core::EventLoop::current().spin_until(move(goal_condition));
+}
+
+void EventLoopPluginSerenity::deferred_invoke(Function<void()> function)
+{
+    VERIFY(function);
+    Core::deferred_invoke(move(function));
+}
+
+NonnullRefPtr<Web::Platform::Timer> EventLoopPluginSerenity::create_timer()
+{
+    return TimerSerenity::create();
+}
+
+}

Userland/Services/WebContent/EventLoopPluginSerenity.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Platform/EventLoopPlugin.h>
+
+namespace WebContent {
+
+class EventLoopPluginSerenity final : public Web::Platform::EventLoopPlugin {
+public:
+    EventLoopPluginSerenity();
+    virtual ~EventLoopPluginSerenity() override;
+
+    virtual void spin_until(Function<bool()> goal_condition) override;
+    virtual void deferred_invoke(Function<void()>) override;
+    virtual NonnullRefPtr<Web::Platform::Timer> create_timer() override;
+};
+
+}

Userland/Services/WebContent/TimerSerenity.cpp

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "TimerSerenity.h"
+#include <AK/NonnullRefPtr.h>
+#include <LibCore/Timer.h>
+
+namespace WebContent {
+
+NonnullRefPtr<TimerSerenity> TimerSerenity::create()
+{
+    return adopt_ref(*new TimerSerenity);
+}
+
+TimerSerenity::TimerSerenity()
+    : m_timer(Core::Timer::construct())
+{
+    m_timer->on_timeout = [this] {
+        if (on_timeout)
+            on_timeout();
+    };
+}
+
+TimerSerenity::~TimerSerenity() = default;
+
+void TimerSerenity::start()
+{
+    m_timer->start();
+}
+
+void TimerSerenity::start(int interval_ms)
+{
+    m_timer->start(interval_ms);
+}
+
+void TimerSerenity::restart()
+{
+    m_timer->restart();
+}
+
+void TimerSerenity::restart(int interval_ms)
+{
+    m_timer->restart(interval_ms);
+}
+
+void TimerSerenity::stop()
+{
+    m_timer->stop();
+}
+
+void TimerSerenity::set_active(bool active)
+{
+    m_timer->set_active(active);
+}
+
+bool TimerSerenity::is_active() const
+{
+    return m_timer->is_active();
+}
+
+int TimerSerenity::interval() const
+{
+    return m_timer->interval();
+}
+
+void TimerSerenity::set_interval(int interval_ms)
+{
+    m_timer->set_interval(interval_ms);
+}
+
+bool TimerSerenity::is_single_shot() const
+{
+    return m_timer->is_single_shot();
+}
+
+void TimerSerenity::set_single_shot(bool single_shot)
+{
+    m_timer->set_single_shot(single_shot);
+}
+
+}

Userland/Services/WebContent/TimerSerenity.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/NonnullRefPtr.h>
+#include <LibCore/Forward.h>
+#include <LibWeb/Platform/Timer.h>
+
+namespace WebContent {
+
+class TimerSerenity final : public Web::Platform::Timer {
+public:
+    static NonnullRefPtr<TimerSerenity> create();
+
+    virtual ~TimerSerenity();
+
+    virtual void start() override;
+    virtual void start(int interval_ms) override;
+    virtual void restart() override;
+    virtual void restart(int interval_ms) override;
+    virtual void stop() override;
+
+    virtual void set_active(bool) override;
+
+    virtual bool is_active() const override;
+    virtual int interval() const override;
+    virtual void set_interval(int interval_ms) override;
+
+    virtual bool is_single_shot() const override;
+    virtual void set_single_shot(bool) override;
+
+private:
+    TimerSerenity();
+
+    NonnullRefPtr<Core::Timer> m_timer;
+};
+
+}

Userland/Services/WebContent/main.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include "EventLoopPluginSerenity.h"
 #include <LibCore/EventLoop.h>
 #include <LibCore/LocalServer.h>
 #include <LibCore/System.h>
@@ -11,6 +12,7 @@
 #include <LibMain/Main.h>
 #include <LibWeb/ImageDecoding.h>
 #include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/Platform/EventLoopPlugin.h>
 #include <LibWeb/WebSockets/WebSocket.h>
 #include <LibWebView/ImageDecoderClientAdapter.h>
 #include <LibWebView/RequestServerAdapter.h>
@@ -28,6 +30,8 @@ ErrorOr<int> serenity_main(Main::Arguments)
     TRY(Core::System::unveil("/tmp/user/%uid/portal/websocket", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
+    Web::Platform::EventLoopPlugin::install(*new WebContent::EventLoopPluginSerenity);
+
     Web::ImageDecoding::Decoder::initialize(WebView::ImageDecoderClientAdapter::create());
     Web::WebSockets::WebSocketClientManager::initialize(TRY(WebView::WebSocketClientManagerAdapter::try_create()));
     Web::ResourceLoader::initialize(TRY(WebView::RequestServerAdapter::try_create()));