> For the complete documentation index, see [llms.txt](https://docs.gamesense.biz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gamesense.biz/pt-br/api-reference/callbacks.md).

# Callbacks

Eventos on\_update e on\_paint e registro de callbacks.

Callbacks executam funções Lua quando determinados eventos ocorrem.

## Eventos

| Evento      | Descrição                                                                                       |
| ----------- | ----------------------------------------------------------------------------------------------- |
| `on_update` | Chamado quando o estado do jogo é atualizado. Executado na thread do jogo, com acesso a IL2CPP. |
| `on_paint`  | Chamado durante a renderização de cada quadro. Destinado à lógica relacionada à renderização.   |

## register\_callback

```lua
register_callback(event: string, callback: function)
```

Registra uma função para determinado evento.

| Parâmetro  | Tipo       | Descrição                               |
| ---------- | ---------- | --------------------------------------- |
| `event`    | `string`   | `"on_update"` ou `"on_paint"`           |
| `callback` | `function` | Função executada quando o evento ocorre |

**Exemplo**

```lua
local counter = menu.label("Frames: 0")
local frames = 0

register_callback("on_paint", function()
    frames = frames + 1
    counter:set("Frames: " .. frames)
end)
```

Um mesmo evento pode ter vários callbacks registrados.

## unregister\_callback

```lua
unregister_callback(event: string)
```

Remove **todos** os callbacks do evento especificado registrados pelo script atual.

| Parâmetro | Tipo     | Descrição      |
| --------- | -------- | -------------- |
| `event`   | `string` | Nome do evento |

```lua
unregister_callback("on_paint")
```

{% hint style="warning" %}
As operações IL2CPP devem ser executadas na thread do jogo, dentro de `on_update`.
{% endhint %}


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