✨ (base): Añade componente Messages

Muestra los mensajes acumulados en el Context por severidad.

assets/css/basic.css

@@ -16,6 +16,10 @@
 	--val-color--text--muted: color-mix(in srgb, var(--val-color--text) 50%, var(--val-color--bg));
 	--val-color--border: #212529;
 	--val-color--primary: #0d6efd;
+	--val-color--secondary: #6c757d;
+	--val-color--light: #dee2e6;
+	--val-color--info: #0dcaf0;
+	--val-color--warning: #ffc107;
 	--val-color--danger: #dc3545;
 	--val-color--switch-off: #adb5bd;
 }
@@ -137,6 +141,35 @@ input:disabled + label {
     color: var(--val-color--text--muted);
 }
 
+/*
+ * Messages component
+ */
+
+.message {
+    padding: 0.75rem 1rem;
+    margin-bottom: 1rem;
+    border: 1px solid transparent;
+    border-radius: 0.375rem;
+}
+
+.message-info {
+    color: color-mix(in srgb, var(--val-color--info) 40%, black);
+    background-color: color-mix(in srgb, var(--val-color--info) 15%, var(--val-color--bg));
+    border-color: color-mix(in srgb, var(--val-color--info) 40%, var(--val-color--bg));
+}
+
+.message-warning {
+    color: color-mix(in srgb, var(--val-color--warning) 40%, black);
+    background-color: color-mix(in srgb, var(--val-color--warning) 15%, var(--val-color--bg));
+    border-color: color-mix(in srgb, var(--val-color--warning) 40%, var(--val-color--bg));
+}
+
+.message-error {
+    color: color-mix(in srgb, var(--val-color--danger) 40%, black);
+    background-color: color-mix(in srgb, var(--val-color--danger) 15%, var(--val-color--bg));
+    border-color: color-mix(in srgb, var(--val-color--danger) 40%, var(--val-color--bg));
+}
+
 /*
  * Table component
  */

src/base/component.rs

@@ -29,6 +29,9 @@ pub use html::Html;
 mod intro;
 pub use intro::{Intro, IntroOpening};
 
+mod messages;
+pub use messages::Messages;
+
 mod pager;
 pub use pager::{Pager, PagerAlign, PagerVisibility};
 

src/base/component/messages.rs

@@ -0,0 +1,88 @@
+use crate::prelude::*;
+
+/// Componente que muestra los **mensajes de usuario** acumulados en el contexto.
+///
+/// No recibe ningún contenido de quien lo construye. Lo obtiene directamente del [`Context`] (ver
+/// [`Context::push_message()`](Context::push_message)) en el momento de renderizarse (ver
+/// [`Context::messages()`]). Si no hay ninguno acumulado, no se renderiza nada.
+///
+/// # Clases CSS
+///
+/// Cada nivel de severidad renderiza siempre las mismas clases fijas: `.message.message-info`,
+/// `.message.message-warning` o `.message.message-error`. Será el tema activo quien decide el
+/// aspecto visual de cada nivel, proporcionando las reglas CSS para esas clases.
+///
+/// # Ejemplo
+///
+/// ```rust,no_run
+/// use pagetop::prelude::*;
+///
+/// async fn save_settings(cx: &mut Context) {
+///     cx.push_message(MessageLevel::Info, Lc::n("Settings saved."));
+/// }
+///
+/// async fn homepage(request: HttpRequest) -> Result<Markup, ErrorPage> {
+///     Page::new(request)
+///         .with_child(Messages::new())
+///         // ... resto del contenido de la página ...
+///         .render()
+///         .await
+/// }
+/// ```
+#[derive(AutoDefault, Clone, Debug, Getters)]
+pub struct Messages {
+    /// Devuelve identificador, clases CSS, atributos HTML y valores extra del componente.
+    props: Props,
+}
+
+#[async_trait]
+impl Component for Messages {
+    fn new() -> Self {
+        Self::default()
+    }
+
+    fn id(&self) -> Option<String> {
+        self.props.get_id()
+    }
+
+    fn setup(&mut self, _cx: &Context) {
+        self.alter_prop(PropsOp::prepend_classes("messages"));
+    }
+
+    async fn prepare(&self, cx: &mut Context) -> Result<Markup, ComponentError> {
+        if !cx.has_messages() {
+            return Ok(html! {});
+        }
+        Ok(html! {
+            div (self.props()) role="alert" {
+                @for message in cx.messages() {
+                    div class=(match message.level() {
+                        MessageLevel::Info => "message message-info",
+                        MessageLevel::Warning => "message message-warning",
+                        MessageLevel::Error => "message message-error",
+                    }) {
+                        (message.text().using(cx))
+                    }
+                }
+            }
+        })
+    }
+}
+
+impl Messages {
+    // **< Messages BUILDER >***********************************************************************
+
+    /// Establece el identificador único del componente; igual a `with_prop(PropsOp::set_id(id))`.
+    #[builder_fn]
+    pub fn with_id(mut self, id: impl Into<CowStr>) -> Self {
+        self.props.alter_id(id);
+        self
+    }
+
+    /// Modifica identificador, clases CSS, atributos HTML o valores extra del componente.
+    #[builder_fn]
+    pub fn with_prop(mut self, op: PropsOp) -> Self {
+        self.props.alter_prop(op);
+        self
+    }
+}