Unity uGui extension for Entity Component System framework

Easy bindings for events from Unity uGui to ECS framework - main goal of this extension.

Important! It's "structs-based" version, if you search "classes-based" version - check classes-based branch!

C#7.3 or above required for this framework.

Tested on unity 2019.1 (dependent on Unity engine) and contains assembly definition for compiling to separate assembly file for performance reason.

Dependent on ECS framework - ECS framework should be imported to unity project first.

Installation

As unity module

This repository can be installed as unity module directly from git url. In this way new line should be added to Packages/manifest.json:

"com.leopotam.ecs-ui": "https://github.com/Leopotam/ecs-ui.git",

As source

If you can't / don't want to use unity modules, code can be downloaded as sources archive of required release from Releases page or cloned from classes-based branch.

Systems

EcsUiEmitter

Ecs run-system that generates entities with events data to ecs world. Should be placed on root GameObject of Ui hierarchy in scene (on root Canvas, for example) and connected in ecs world before any systems that should process events from ui:

public class Startup : MonoBehaviour {
    // Field that should be initialized by instance of `EcsUiEmitter` assigned to Ui root GameObject.
    [SerializeField] EcsUiEmitter _uiEmitter = null;

    EcsSystems _systems;

    void Start () {
        var world = new EcsWorld ();
        _systems = new EcsSystems (world)
            // Additional systems here...
            .Add (new TestSystem ())
            .InjectUi (_uiEmitter);
        _systems.Init ();
    }
}

public class TestSystem : IEcsInitSystem {
    // auto-injected fields.
    EcsUiEmitter _ui = null;
    [EcsUiNamed("MyButton")] GameObject _btnGo;
    [EcsUiNamed("MyButton")] Transform _btnTransform;
    [EcsUiNamed("MyButton")] Button _btn;

    public void Init () {
        // All fields above will be filled and can be used here.
        // Results of injection:
        // _ui = instance of injected EcsUiEmitter.
        // _btnGo = _ui.GetNamedObject ("MyButton");
        // _btnTransform = _ui.GetNamedObject ("MyButton").GetComponent<Transform> ();
        // _btn = _ui.GetNamedObject ("MyButton").GetComponent<Button> ();
    }
}

No need to inject EcsUiEmitter instance through EcsSystems.Inject if you call EcsSystems.InjectUi already.

Actions

MonoBehaviour components that should be added to uGui widgets to transfer events from them to ecs-world (EcsUiClickAction, EcsUiDragAction and others). Each action component contains reference to EcsUiEmitter in scene (if not inited - will try to find emitter automatically) and logical name WidgetName that can helps to detect source of event (or just get named GameObject) inside ecs-system.

Components

Event data containers: EcsUiClickEvent, EcsUiBeginDragEvent, EcsUiEndDragEvent and others - they can be used as ecs-components with standard filtering through EcsFilter:

public class TestUiClickEventSystem : IEcsRunSystem {
    // auto-injected fields.
    readonly EcsWorld _world = null;
    readonly EcsFilter<EcsUiClickEvent> _clickEvents = null;

    public void Run () {
        foreach (var idx in _clickEvents) {
            ref EcsUiClickEvent data = ref _clickEvents.Get1 (idx);
            Debug.Log ("Im clicked!", data.Sender);
        }
    }
}

Initialization

public class Startup : MonoBehaviour {
    // Field that should be initialized by instance of `EcsUiEmitter` assigned to Ui root GameObject.
    [SerializeField] EcsUiEmitter _uiEmitter = null;

    EcsWorld _world;
    EcsSystems _systems;

    void Start () {
        _world = new EcsWorld ();
        _systems = new EcsSystems (_world);
        _systems
            // Additional systems here...
            .InjectUi (_uiEmitter)
            .Init ();
    }

    void Update () {
        _systems?.Run ();
    }

    void OnDestroy () {
        if (_systems != null) {
            _systems.Destroy ();
            _systems = null;
            _world.Destroy ();
            _world = null;
        }
    }
}

Examples

Examples repo.

License

The software released under the terms of the MIT license. Enjoy.

Donate

Its free opensource software, but you can buy me a coffee: