More work on State System

src/dawn/state/StateInterfaces.hpp

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+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "assert/assert.hpp"
+#include "event/Event.hpp"
+
+namespace Dawn {
+  class IStateEvent;
+
+  template<typename...A>
+  class StateEvent;
+
+  template<typename ...A>
+  class StateOwnerEventLegacy;
+
+  class IStateOwnerEventLegacy {
+    public:
+      virtual void removeListener() = 0;
+      virtual void teardown() = 0;
+  };
+
+  class IStateOwner {
+    public:
+      virtual void _stateEventDisposed(IStateEvent *evt) = 0;
+      virtual void _stateLegacyEventDisposed(IStateOwnerEventLegacy *evt) = 0;
+  };
+
+  template<typename...A>
+  struct StateEventListener {
+    uint32_t id;
+    IStateOwner *owner;
+    std::function<void(A...)> listener;
+    std::function<void(StateEventListener<A...>)> unsubWithParams;
+    std::function<void()> unsub;
+    StateEvent<A...> *event;
+  };
+  
+  class IStateProperty {
+    public:
+      std::vector<std::function<void()>> _effectListners;
+      std::vector<std::function<std::function<void()>()>> _effectListnersWithTeardown;
+      std::vector<std::function<void()>> _effectTeardowns;
+  };
+
+  class IStateEvent {
+    protected:
+      virtual void _stateOwnerDestroyed(IStateOwner *owner) = 0;
+      friend class StateOwner;
+  };
+}