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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../index.html">Introdução</a></li><li class="chapter-item expanded "><a href="../getting_started/index.html"><strong aria-hidden="true">1.</strong> Introdução Rápida as Plataformas</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../getting_started/desktop.html"><strong aria-hidden="true">1.1.</strong> Desktop</a></li><li class="chapter-item expanded "><a href="../getting_started/web.html"><strong aria-hidden="true">1.2.</strong> Web</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../getting_started/hot_reload.html"><strong aria-hidden="true">1.2.1.</strong> Hot Reload</a></li></ol></li><li class="chapter-item expanded "><a href="../getting_started/ssr.html"><strong aria-hidden="true">1.3.</strong> Renderização por Servidor</a></li><li class="chapter-item expanded "><a href="../getting_started/tui.html"><strong aria-hidden="true">1.4.</strong> Interface do Terminal</a></li><li class="chapter-item expanded "><a href="../getting_started/mobile.html"><strong aria-hidden="true">1.5.</strong> Móvel</a></li></ol></li><li class="chapter-item expanded "><a href="../describing_ui/index.html"><strong aria-hidden="true">2.</strong> Descrevendo a Interface do Usuário</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../describing_ui/special_attributes.html"><strong aria-hidden="true">2.1.</strong> Atributos Especiais</a></li><li class="chapter-item expanded "><a href="../describing_ui/components.html"><strong aria-hidden="true">2.2.</strong> Componentes</a></li><li class="chapter-item expanded "><a href="../describing_ui/component_props.html"><strong aria-hidden="true">2.3.</strong> Props</a></li><li class="chapter-item expanded "><a href="../describing_ui/component_children.html"><strong aria-hidden="true">2.4.</strong> Componente Filho</a></li></ol></li><li class="chapter-item expanded "><a href="../interactivity/index.html"><strong aria-hidden="true">3.</strong> Interatividade</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../interactivity/event_handlers.html"><strong aria-hidden="true">3.1.</strong> Manipuladores de Eventos</a></li><li class="chapter-item expanded "><a href="../interactivity/hooks.html"><strong aria-hidden="true">3.2.</strong> Hooks & Estado de Componentes</a></li><li class="chapter-item expanded "><a href="../interactivity/user_input.html"><strong aria-hidden="true">3.3.</strong> Entradas do Usuário</a></li><li class="chapter-item expanded "><a href="../interactivity/sharing_state.html"><strong aria-hidden="true">3.4.</strong> Estado Compartilhado</a></li><li class="chapter-item expanded "><a href="../interactivity/custom_hooks.html" class="active"><strong aria-hidden="true">3.5.</strong> Hooks Personalizados</a></li><li class="chapter-item expanded "><a href="../interactivity/dynamic_rendering.html"><strong aria-hidden="true">3.6.</strong> Renderização Dinâmica</a></li><li class="chapter-item expanded "><a href="../interactivity/roteador.html"><strong aria-hidden="true">3.7.</strong> Roteamento</a></li></ol></li><li class="chapter-item expanded "><a href="../async/index.html"><strong aria-hidden="true">4.</strong> Assincronia</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../async/use_future.html"><strong aria-hidden="true">4.1.</strong> UseFuture</a></li><li class="chapter-item expanded "><a href="../async/use_coroutine.html"><strong aria-hidden="true">4.2.</strong> UseCoroutine</a></li><li class="chapter-item expanded "><a href="../async/spawn.html"><strong aria-hidden="true">4.3.</strong> Gerando Futures</a></li></ol></li><li class="chapter-item expanded "><a href="../best_practices/index.html"><strong aria-hidden="true">5.</strong> Práticas Recomendadas</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../best_practices/error_handling.html"><strong aria-hidden="true">5.1.</strong> Tratamento de erros</a></li><li class="chapter-item expanded "><a href="../best_practices/antipatterns.html"><strong aria-hidden="true">5.2.</strong> Antipadrões</a></li></ol></li><li class="chapter-item expanded "><a href="../publishing/index.html"><strong aria-hidden="true">6.</strong> Publicação</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../publishing/desktop.html"><strong aria-hidden="true">6.1.</strong> Desktop</a></li><li class="chapter-item expanded "><a href="../publishing/web.html"><strong aria-hidden="true">6.2.</strong> Web</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../custom_renderer/index.html"><strong aria-hidden="true">7.</strong> Renderizador Personalizado</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><a href="../roadmap.html">Roteiro</a></li><li class="chapter-item expanded affix "><a href="../contributing.html">Contribuindo</a></li></ol>
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<h1 id="hooks-personalizados"><a class="header" href="#hooks-personalizados">Hooks Personalizados</a></h1>
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<p><em>Hooks</em> são uma ótima maneira de encapsular a lógica de negócio. Se nenhum dos <em>hooks</em> existentes funcionar para o seu problema, você pode escrever o seu próprio.</p>
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<h2 id="hooks-de-composição"><a class="header" href="#hooks-de-composição">Hooks de Composição</a></h2>
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<p>Para evitar a repetição, você pode encapsular a lógica de negócios com base em <em>hooks</em> existentes para criar um novo gancho.</p>
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<p>Por exemplo, se muitos componentes precisam acessar uma <em>struct</em> <code>AppSettings</code>, você pode criar um gancho de "atalho":</p>
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<pre><pre class="playground"><code class="language-rust edition2018">
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<span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>fn use_settings(cx: &ScopeState) -> &UseSharedState<AppSettings> {
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use_shared_state::<AppSettings>(cx).expect("App settings not provided")
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}
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<span class="boring">}
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</span></code></pre></pre>
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<h2 id="lógica-de-hook-personalizada"><a class="header" href="#lógica-de-hook-personalizada">Lógica de Hook Personalizada</a></h2>
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<p>Você pode usar <a href="https://docs.rs/dioxus/latest/dioxus/prelude/struct.Scope.html#method.use_hook"><code>cx.use_hook</code></a> para construir seus próprios <em>hooks</em>. Na verdade, é nisso que todos os <em>hooks</em> padrão são construídos!</p>
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<p><code>use_hook</code> aceita um único encerramento para inicializar o <em>hook</em>. Ele será executado apenas na primeira vez que o componente for renderizado. O valor de retorno desse encerramento será usado como o valor do <em>hook</em> – o Dioxus o pegará e o armazenará enquanto o componente estiver vivo. Em cada renderização (não apenas na primeira!), você receberá uma referência a esse valor.</p>
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<blockquote>
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<p>Nota: Você pode implementar <a href="https://doc.rust-lang.org/std/ops/trait.Drop.html"><code>Drop</code></a> para o valor do seu <em>hook</em> – ele será descartado e o componente será desmontado (não mais na interface do usuário)</p>
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</blockquote>
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<p>Dentro do encerramento de inicialização, você normalmente fará chamadas para outros métodos <code>cx</code>. Por exemplo:</p>
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<ul>
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<li>O <em>hook</em> <code>use_state</code> rastreia o estado no valor do <em>hook</em> e usa <a href="https://docs.rs/dioxus/latest/dioxus/prelude/struct.Scope.html#method.schedule_update"><code>cx.schedule_update</code></a> para o Dioxus renderizar novamente o componente sempre que ele for alterado.</li>
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<li>O <em>hook</em> <code>use_context</code> chama <a href="https://docs.rs/dioxus/latest/dioxus/prelude/struct.Scope.html#method.consume_context"><code>cx.consume_context</code></a> (que seria custoso chamar em cada render) para obter algum contexto do escopo</li>
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