initial

Author: vanifatovvlad

.editorconfig

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+MIT License
+
+Copyright (c) 2022 CodeWriter Packages
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE.md

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-# Morpeh.SystemStateProcessor
+# Morpeh.SystemStateProcessor [![Github license](https://img.shields.io/github/license/codewriter-packages/Morpeh.SystemStateProcessor.svg?style=flat-square)](#) [![Unity 2021.3](https://img.shields.io/badge/Unity-2021.3+-2296F3.svg?style=flat-square)](#) ![GitHub package.json version](https://img.shields.io/github/package-json/v/codewriter-packages/Morpeh.SystemStateProcessor?style=flat-square)
+_Reactivity for Morpeh ECS_
+
+## How to use?
+
+```csharp
+using System;
+using Scellecs.Morpeh;
+using Scellecs.Morpeh.Systems;
+using UnityEngine;
+
+[Serializable] public struct HeroComponent : IComponent { }
+[Serializable] public struct HeroDamagedMarker : IComponent { }
+[Serializable] public struct HeroDeadMarker : IComponent { }
+
+public class HealthBarSystem : UpdateSystem {
+    [SerializeField] private GameObject healthBarPrefab;
+
+    private SystemStateProcessor<HealthBarSystemStateComponent> heroProcessor;
+
+    public override void OnAwake() {
+        heroProcessor = World.Filter.With<HeroComponent>().With<HeroDamagedMarker>().Without<HeroDeadMarker>()
+            .ToSystemStateProcessor(CreateHealthBarForHero, RemoveHealthBarForHero);
+    }
+
+    public override void OnUpdate(float deltaTime) {
+        heroProcessor.Process();
+    }
+
+    // Called when an entity has been added to the Filter
+    private HealthBarSystemStateComponent CreateHealthBarForHero(Entity heroEntity) {
+        var healthBar = Instantiate(healthBarPrefab);
+
+        return new HealthBarSystemStateComponent {
+            healthBar = healthBar,
+        };
+    }
+
+    // Called when an entity has been removed from filter or has been destroyed
+    private void RemoveHealthBarForHero(ref HealthBarSystemStateComponent state) {
+        Destroy(state.healthBar);
+    }
+
+    [Serializable]
+    private struct HealthBarSystemStateComponent : ISystemStateComponent {
+        public GameObject healthBar;
+    }
+}
+
+public class DestroySystem : UpdateSystem {
+    private Filter _toDestroyFilter;
+
+    public override void OnAwake() { }
+
+    public override void OnUpdate(float deltaTime) {
+        foreach (var entity in _toDestroyFilter) {
+            // MigrateSystemStateComponents must be called before each RemoveEntity
+            World.MigrateSystemStateComponents(entity);
+            World.RemoveEntity(entity);
+        }
+    }
+}
+```
+
+## License
+
+Morpeh.SystemStateProcessor is [MIT licensed](./LICENSE.md).

LICENSE.md.meta

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+namespace Scellecs.Morpeh
+{
+    public interface ISystemStateComponent : IComponent
+    {
+    }
+}

README.md

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+{
+    "reference": "Scellecs.Morpeh"
+}