> For the complete documentation index, see [llms.txt](https://mandor-labs.gitbook.io/mandor-labs-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mandor-labs.gitbook.io/mandor-labs-docs/event-system/getting-started/quickstart.md).

# Quickstart

## Steps

{% stepper %}
{% step %}

#### Define a Custom Event

Create a simple class that implement interface from `Event<T>` to hold your event's spesific data.

```csharp
using ModularLabs.Event;

public class VisibilityEvent : Event<VisibilityEvent>
{
    public enum Type
    {
        None,
        Show,
        Hide
    }

    public Type type;

    public override void Reset()
    {
        type = default;
    }
}
```

{% endstep %}

{% step %}

#### Subscribe to the Event

Implement the `EventListener<T>` interface on any `MonoBehaviour` to start listening for and responding to your custom events.

```csharp
using ModularLabs.Event;
using UnityEngine;

public class ObjectBox : MonoBehaviour, EventListener<VisibilityEvent>
{
    private void OnEnabled()
    {
        this.RegisterEvent<VisibilityEvent>(); // Subscribe to the event
    }

    private void OnDisabled()
    {
        this.UnregisterEvent<VisibilityEvent>(); // Unsubscribe from the event
    }

    public void OnEvent(object sender, VisibilityEvent e)
    {
        //callback here
    }
}

```

{% endstep %}

{% step %}

#### Trigger the Event

Broadcast your event globally from anywhere in your codebase using the static `.Trigger()` API.

```csharp
VisibilityEvent.Trigger(this, new VisibilityEvent()
{
    type = VisibilityEvent.Type.Show
});
```

{% endstep %}
{% endstepper %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://mandor-labs.gitbook.io/mandor-labs-docs/event-system/getting-started/quickstart.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.