Start working on a Widgets library.

Widgets/EventLoop.cpp

@@ -0,0 +1,52 @@
+#include "EventLoop.h"
+#include "Event.h"
+#include "Object.h"
+
+static EventLoop* s_mainEventLoop;
+
+EventLoop::EventLoop()
+{
+    if (!s_mainEventLoop)
+        s_mainEventLoop = this;
+}
+
+EventLoop::~EventLoop()
+{
+}
+
+EventLoop& EventLoop::main()
+{
+    ASSERT(s_mainEventLoop);
+    return *s_mainEventLoop;
+}
+
+int EventLoop::exec()
+{
+    for (;;) {
+        if (m_queuedEvents.isEmpty())
+            waitForEvent();
+        auto events = std::move(m_queuedEvents);
+        for (auto& queuedEvent : events) {
+            auto* receiver = queuedEvent.receiver;
+            auto& event = *queuedEvent.event;
+            printf("EventLoop: Object{%p} event %u (%s)\n", receiver, (unsigned)event.type(), event.name());
+            if (!receiver) {
+                switch (event.type()) {
+                case Event::Quit:
+                    return 0;
+                default:
+                    printf("event type %u with no receiver :(\n", event.type());
+                    return 1;
+                }
+            } else {
+                receiver->event(event);
+            }
+        }
+    }
+}
+
+void EventLoop::postEvent(Object* receiver, OwnPtr<Event>&& event)
+{
+    m_queuedEvents.append({ receiver, std::move(event) });
+}
+