POC

src/dawn/state/StateProvider.hpp

@@ -0,0 +1,53 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#pragma once
+#include "state/State.hpp"
+
+namespace Dawn {
+  class SceneItemComponent;
+
+  template<typename D, typename...A>
+  struct StateListener {
+    std::function<void(A...)> callback;
+    D data;
+  };
+
+  template<typename D, typename...A>
+  struct StateProviderSet {
+    private:
+      std::vector<StateListener<D,A...>> listeners;
+
+    public:
+      std::function<void()> addEffect(
+        std::function<void(A...)> callback,
+        D data
+      ) {
+        struct StateListener<D, A...> l;
+        l.callback = callback;
+        l.data = data;
+        this->listeners.push_back(l);
+
+        l.callback();
+
+        return std::bind([&](struct StateListener<D, A...> listener) {
+          assertUnreachable();
+        }, l);
+      }
+  };
+
+  class TimeProvider {
+    public:
+      StateProviderSet<float_t> effect;
+  };
+
+  std::function<void()> useTimeout(
+    std::function<void()> someCallback,
+    float_t timeout,
+    SceneItemComponent *context
+  ) {
+    return (TimeProvider()).effect.addEffect(someCallback, timeout);
+  }
+}