Rename all the LibGUI classes to GClassName.

LibGUI/GEventLoop.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "GEvent.h"
+#include <AK/OwnPtr.h>
+#include <AK/Vector.h>
+
+class GObject;
+
+class GEventLoop {
+public:
+    GEventLoop();
+    ~GEventLoop();
+
+    int exec();
+
+    void postEvent(GObject* receiver, OwnPtr<GEvent>&&);
+
+    static GEventLoop& main();
+
+    static void initialize();
+
+    bool running() const { return m_running; }
+
+private:
+    void waitForEvent();
+
+    struct QueuedEvent {
+        GObject* receiver { nullptr };
+        OwnPtr<GEvent> event;
+    };
+    Vector<QueuedEvent> m_queuedEvents;
+
+    bool m_running { false };
+};