refactor rendering

include/td/misc/ObjectNotifier.h

@@ -1,36 +0,0 @@
-#pragma once
-
-#include <algorithm>
-#include <functional>
-#include <vector>
-
-namespace td {
-namespace utils {
-
-template <typename Listener>
-class ObjectNotifier {
-protected:
-	std::vector<Listener*> m_Listeners;
-
-public:
-	void BindListener(Listener* listener) {
-		m_Listeners.push_back(listener);
-	}
-
-	void UnbindListener(Listener* listener) {
-		auto iter = std::find(m_Listeners.begin(), m_Listeners.end(), listener);
-
-		if (iter == m_Listeners.end()) return;
-
-		m_Listeners.erase(iter);
-	}
-
-	template <typename Func, typename... Args>
-	void NotifyListeners(Func function, Args... args) {
-		for (Listener* listener : m_Listeners)
-			std::bind(function, listener, args...)();
-	}
-};
-
-} // namespace utils
-} // namespace td

include/td/misc/Signal.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <algorithm>
+#include <functional>
+#include <td/common/NonCopyable.h>
+#include <vector>
+
+namespace td {
+namespace utils {
+
+template <typename... Args>
+class Signal : private NonCopyable {
+  private:
+	using CallBack = std::function<void(Args...)>;
+
+	std::vector<CallBack> m_Callbacks;
+
+  public:
+	void Connect(CallBack&& a_Callback) {
+		m_Callbacks.push_back(std::move(a_Callback));
+	}
+
+	void operator()(Args... args) const {
+		for (const CallBack& callback : m_Callbacks) {
+			callback(args...);
+		}
+	}
+};
+
+}  // namespace utils
+}  // namespace td