1 files changed, 74 insertions, 0 deletions
diff --git a/Libraries/LibCore/CEvent.h b/Libraries/LibCore/CEvent.h
new file mode 100644
index 0000000000..9d262c4a76
--- /dev/null
+++ b/Libraries/LibCore/CEvent.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/Function.h>
+#include <AK/Types.h>
+#include <AK/WeakPtr.h>
+
+class CObject;
+
+class CEvent {
+public:
+    enum Type {
+        Invalid = 0,
+        Quit,
+        Timer,
+        DeferredDestroy,
+        DeferredInvoke,
+        ChildAdded,
+        ChildRemoved,
+    };
+
+    CEvent() {}
+    explicit CEvent(unsigned type)
+        : m_type(type)
+    {
+    }
+    virtual ~CEvent() {}
+
+    unsigned type() const { return m_type; }
+
+private:
+    unsigned m_type { Type::Invalid };
+};
+
+class CDeferredInvocationEvent : public CEvent {
+    friend class CEventLoop;
+
+public:
+    CDeferredInvocationEvent(Function<void(CObject&)> invokee)
+        : CEvent(CEvent::Type::DeferredInvoke)
+        , m_invokee(move(invokee))
+    {
+    }
+
+private:
+    Function<void(CObject&)> m_invokee;
+};
+
+class CTimerEvent final : public CEvent {
+public:
+    explicit CTimerEvent(int timer_id)
+        : CEvent(CEvent::Timer)
+        , m_timer_id(timer_id)
+    {
+    }
+    ~CTimerEvent() {}
+
+    int timer_id() const { return m_timer_id; }
+
+private:
+    int m_timer_id;
+};
+
+class CChildEvent final : public CEvent {
+public:
+    CChildEvent(Type, CObject& child);
+    ~CChildEvent();
+
+    CObject* child() { return m_child.ptr(); }
+    const CObject* child() const { return m_child.ptr(); }
+
+private:
+    WeakPtr<CObject> m_child;
+};