Add sticky toasts, action events and toast hooks

A sticky toast stays until it is dismissed or its action pressed, for a
question that must be answered ("A new version is ready" with Reload).
It is kept aside rather than queued, so it never holds up ordinary
toasts: one that arrives while it shows takes its place, and the sticky
toast comes back once the queue is empty. One is kept at a time; a newer
sticky toast replaces it. Every other toast keeps today's queue.

An action's `event` names a window event dispatched when it is pressed,
beside `handler`, for toasts whose detail cannot carry a function. The
snackbar now closes before either runs, so a toast they show is not the
one dismissed.

`data-toast` and `data-toast-action` give applications stable hooks for
their tests.

The queue now forgets a cleared timer in next(): a toast dismissed by a
click that neither hovered nor focused it first, as a screen reader
activates a button, left its timer running and cut the next toast short.

The showcase's snackbar buttons had no Alpine scope and did nothing; they
are wrapped in one, with a sticky example.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RHoXZSHc8gGpZjFmA5fPc2

resources/boost/skills/livewire-material-development/SKILL.md

@@ -313,6 +313,16 @@ materialToast('Share deleted', { type: 'success', description: null, timeout: 40
 
 `type` (`success`, `error`, `warning`, `info`) adds the state icon; `timeout: 0` keeps it until dismissed; a toast with an action or no timeout gets a close button. Hover or focus pauses the timer.
 
+- `action`: `label`, plus `handler` (a function) and/or `event` (a name). Pressing it closes the snackbar, calls `handler`, then dispatches `new CustomEvent(event)` on `window`; give both and both run. Use `event` where a function cannot travel, such as a toast built from JSON.
+- `sticky: true` keeps a toast until it is dismissed or its action is pressed (any `timeout` is ignored), without holding the queue up: a toast dispatched meanwhile shows in its place, and the sticky one comes back once the queue is empty. One sticky toast is kept at a time; a newer one replaces it. Use it for a question that must be answered, not for news:
+
+```js
+window.dispatchEvent(new CustomEvent('toast', { detail: { type: 'info', title: 'A new version is ready', sticky: true, action: { label: 'Reload', event: 'app:update' } } }))
+window.addEventListener('app:update', () => location.reload())
+```
+
+- Hooks: `data-toast` on the snackbar on screen, `data-toast-action` on its action button (`[data-toast]` is absent while nothing shows). Target these in tests, not classes.
+
 ### `<x-progress>`
 
 M3 Expressive's progress indicator: linear (as wide as its container) or `circular` (40px, 48px wavy, unless a `size-*` class is passed), flat or `wavy`, determinate with a `value` or indeterminate without one.

resources/js/snackbar.js

@@ -4,6 +4,11 @@
  * One snackbar at a time, as M3 shows them. Each waits its turn, stays for its timeout (paused
  * while hovered or focused, so it is never pulled away from someone reading or reaching for its
  * action) and is replaced by the next.
+ *
+ * A `sticky` toast ("A new version is ready" with a Reload action) stays until it is answered, but
+ * never holds the queue up: it is kept aside rather than queued, a toast that arrives while it shows
+ * takes its place, and it comes back once the queue is empty. Only one is kept — a newer sticky
+ * toast replaces it. Dismissing it, or pressing its action, lets it go.
  */
 const DEFAULT_TIMEOUT_MS = 4000
 
@@ -25,6 +30,7 @@ document.addEventListener('alpine:init', () => {
     window.Alpine.data('materialSnackbar', () => ({
         queue: [],
         current: null,
+        sticky: null,
         timer: null,
         remaining: 0,
         startedAt: 0,
@@ -44,24 +50,43 @@ document.addEventListener('alpine:init', () => {
             // Livewire dispatches named arguments as the detail object; a positional dispatch
             // arrives as an array whose first entry is that object.
             const toast = Array.isArray(detail) ? detail[0] : detail
+            const sticky = toast.sticky === true
 
-            this.queue.push({
+            const entry = {
                 id: ++sequence,
                 type: toast.type ?? null,
                 title: toast.title ?? '',
                 description: toast.description ?? null,
-                timeout: toast.timeout === 0 || toast.timeout === null ? 0 : (toast.timeout ?? DEFAULT_TIMEOUT_MS),
+                timeout: sticky || toast.timeout === 0 || toast.timeout === null ? 0 : (toast.timeout ?? DEFAULT_TIMEOUT_MS),
                 action: toast.action ?? null,
-            })
+                sticky,
+            }
 
-            if (!this.current) {
+            if (sticky) {
+                const showing = !this.current || this.current === this.sticky
+                this.sticky = entry
+
+                if (showing) {
+                    this.next()
+                }
+
+                return
+            }
+
+            this.queue.push(entry)
+
+            // A sticky toast steps aside for it, and comes back from next() once the queue is empty.
+            if (!this.current || this.current === this.sticky) {
                 this.next()
             }
         },
 
         next() {
+            // Cleared and forgotten here, so a toast dismissed early never leaves its timer running
+            // to cut the next one short.
             clearTimeout(this.timer)
-            this.current = this.queue.shift() ?? null
+            this.timer = null
+            this.current = this.queue.shift() ?? this.sticky
 
             if (this.current?.timeout) {
                 this.remaining = this.current.timeout
@@ -92,13 +117,24 @@ document.addEventListener('alpine:init', () => {
         },
 
         dismiss() {
-            this.timer = null
+            if (this.current && this.current === this.sticky) {
+                this.sticky = null
+            }
+
             this.next()
         },
 
+        // Closed before the handler and the event run, so a toast either of them shows is not the
+        // one dismissed.
         act() {
-            this.current?.action?.handler?.()
+            const action = this.current?.action
+
             this.dismiss()
+            action?.handler?.()
+
+            if (typeof action?.event === 'string' && action.event !== '') {
+                window.dispatchEvent(new CustomEvent(action.event))
+            }
         },
 
         icon(type) {

resources/views/components/toast.blade.php

@@ -5,9 +5,18 @@
 
      It shows every `toast` browser event — what `NoNameWeb\LivewireMaterial\Concerns\Toasts`
      dispatches from a Livewire component — and for `window.materialToast(title, options)` from
-     JavaScript (`{ type, description, timeout, action: { label, handler } }`). Toasts queue and
-     show in turn, each for its `timeout` (4s by default; M3 asks for 4–10s), paused while the
-     pointer or focus is on it. A toast with an action or no timeout gets a close button.
+     JavaScript (`{ type, description, timeout, sticky, action: { label, handler, event } }`).
+     Toasts queue and show in turn, each for its `timeout` (4s by default; M3 asks for 4–10s),
+     paused while the pointer or focus is on it. A toast with an action or no timeout gets a close
+     button. Pressing the action closes the snackbar, calls `handler` and dispatches `event` (a
+     name) on `window`; both may be given.
+
+     `sticky: true` keeps a toast until it is dismissed or its action pressed, without holding up
+     the queue: a toast that arrives meanwhile shows in its place, and the sticky one comes back
+     once the queue is empty. One is kept at a time; a newer sticky toast replaces it.
+
+     Hooks for tests and styling: `data-toast` on the snackbar on screen, `data-toast-action` on its
+     action button.
 
      `@persist` keeps the host across wire:navigate, so a toast dispatched with `redirectTo` is
      still on screen when the next page arrives.
@@ -32,6 +41,7 @@
         <template x-if="current">
             <div
                 x-bind:key="current.id"
+                data-toast
                 x-bind:role="current.type === 'error' || current.type === 'warning' ? 'alert' : 'status'"
                 aria-live="polite"
                 x-on:mouseenter="pause()"
@@ -60,7 +70,7 @@
                 </div>
 
                 <template x-if="current.action">
-                    <button type="button" class="state-layer focus-ring h-10 shrink-0 rounded-corner-full px-3 type-label-lg text-inverse-primary" x-text="current.action.label" x-on:click="act()"></button>
+                    <button type="button" data-toast-action class="state-layer focus-ring h-10 shrink-0 rounded-corner-full px-3 type-label-lg text-inverse-primary" x-text="current.action.label" x-on:click="act()"></button>
                 </template>
 
                 <template x-if="current.action || ! current.timeout">

resources/views/showcase/sections/communication.blade.php

@@ -10,10 +10,13 @@
             <x-badge value="Pro" outline />
             BLADE,
         'Snackbars' => <<<'BLADE'
-            <x-button label="Saved" variant="tonal" x-on:click="materialToast('Settings saved', { type: 'success' })" />
-            <x-button label="With a description" variant="tonal" x-on:click="materialToast('Upload failed', { type: 'error', description: 'The file is larger than 4 GB.' })" />
-            <x-button label="With an action" variant="tonal" x-on:click="materialToast('Share deleted', { action: { label: 'Undo', handler: () => materialToast('Share restored', { type: 'info' }) } })" />
-            <x-button label="Until dismissed" variant="tonal" x-on:click="materialToast('Your storage is almost full', { type: 'warning', timeout: 0 })" />
+            <div x-data class="flex flex-wrap items-center gap-4">
+                <x-button label="Saved" variant="tonal" x-on:click="materialToast('Settings saved', { type: 'success' })" />
+                <x-button label="With a description" variant="tonal" x-on:click="materialToast('Upload failed', { type: 'error', description: 'The file is larger than 4 GB.' })" />
+                <x-button label="With an action" variant="tonal" x-on:click="materialToast('Share deleted', { action: { label: 'Undo', handler: () => materialToast('Share restored', { type: 'info' }) } })" />
+                <x-button label="Until dismissed" variant="tonal" x-on:click="materialToast('Your storage is almost full', { type: 'warning', timeout: 0 })" />
+                <x-button label="Sticky, with an event" variant="tonal" x-on:click="materialToast('A new version is ready', { type: 'info', sticky: true, action: { label: 'Reload', event: 'showcase:reload' } })" x-on:showcase:reload.window="materialToast('Reloading…')" />
+            </div>
             BLADE,
         'Plain tooltips' => <<<'BLADE'
             <x-button icon="content_copy" tooltip="Copy link" />

tests/Browser/CommunicationTest.php

@@ -2,6 +2,8 @@
 
 const SNACKBAR = "document.querySelector('[x-data=\"materialSnackbar\"] [aria-live]')";
 
+const TOAST = "document.querySelector('[data-toast]')";
+
 it('shows a toast as a snackbar, then the next in turn', function () {
     $page = visit('/material/communication')->waitForEvent('networkidle')
         ->assertScript("document.readyState === 'complete' && typeof window.Alpine !== 'undefined' && typeof window.Livewire !== 'undefined'");
@@ -39,6 +41,65 @@ it('runs a toast\'s action and dismisses it', function () {
         ->assertScript(SNACKBAR.' === null');
 });
 
+it('does not let a toast dismissed early cut the next one short', function () {
+    $page = visit('/material/communication')->waitForEvent('networkidle')
+        ->assertScript("document.readyState === 'complete' && typeof window.Alpine !== 'undefined' && typeof window.Livewire !== 'undefined'");
+
+    $page->script("window.eval(\"materialToast('Share deleted', { timeout: 800, action: { label: 'Undo' } }); materialToast('Link copied', { timeout: 2500 })\")");
+
+    // A click with no hover or focus before it, as a screen reader activates a button: nothing has
+    // paused the first toast's timer.
+    $page->script("document.querySelector('[data-toast] button[aria-label=\"Dismiss\"]').click()");
+
+    $page->assertScript(TOAST."?.textContent.includes('Link copied')")
+        ->wait(1.2);
+
+    $page->assertScript(TOAST."?.textContent.includes('Link copied')");
+});
+
+it('keeps a sticky toast aside while a passing one shows, brings back the newest, and lets it go once dismissed', function () {
+    $page = visit('/material/communication')->waitForEvent('networkidle')
+        ->assertScript("document.readyState === 'complete' && typeof window.Alpine !== 'undefined' && typeof window.Livewire !== 'undefined'");
+
+    // As an application dispatches it; built in the page's realm (see above).
+    $page->script("window.eval(\"window.dispatchEvent(new CustomEvent('toast', { detail: { type: 'info', title: 'A new version is ready', sticky: true, timeout: 300, action: { label: 'Reload', event: 'material:test-reload' } } }))\")");
+
+    $page->assertScript(TOAST."?.textContent.includes('A new version is ready')")
+        ->wait(0.6);
+
+    $page->assertScript(TOAST."?.textContent.includes('A new version is ready')");
+
+    $page->script("window.eval(\"materialToast('Settings saved', { type: 'success', timeout: 900 }); materialToast('Version 2 is ready', { sticky: true })\")");
+
+    $page->assertScript(TOAST."?.textContent.includes('Settings saved')")
+        ->wait(1.3);
+
+    $page->assertScript(TOAST."?.textContent.includes('Version 2 is ready')");
+
+    $page->click('[data-toast] button[aria-label="Dismiss"]')
+        ->assertScript(TOAST.' === null');
+
+    // Dismissed rather than left to time out: the pointer still rests where the snackbar appears,
+    // and hovering pauses it.
+    $page->script("window.eval(\"materialToast('Link copied', { timeout: 0 })\")");
+
+    $page->assertScript(TOAST."?.textContent.includes('Link copied')")
+        ->click('[data-toast] button[aria-label="Dismiss"]')
+        ->assertScript(TOAST.' === null');
+});
+
+it('dispatches a toast action\'s window event alongside its handler, and closes', function () {
+    $page = visit('/material/communication')->waitForEvent('networkidle')
+        ->assertScript("document.readyState === 'complete' && typeof window.Alpine !== 'undefined' && typeof window.Livewire !== 'undefined'");
+
+    $page->script("window.eval(\"window.reloads = 0; window.handled = 0; window.addEventListener('material:test-reload', () => window.reloads++); materialToast('A new version is ready', { sticky: true, action: { label: 'Reload', event: 'material:test-reload', handler: () => window.handled++ } })\")");
+
+    $page->click('[data-toast-action]')
+        ->assertScript(TOAST.' === null')
+        ->assertScript("window.eval('window.reloads') === 1")
+        ->assertScript("window.eval('window.handled') === 1");
+});
+
 it('opens a persistent rich tooltip on press', function () {
     $bubble = "document.querySelector('#communication [role=\"dialog\"][popover]')";
 

tests/Feature/Components/ToastTest.php

@@ -13,3 +13,11 @@ it('hosts the snackbar queue, kept across wire:navigate', function () {
 it('can sit at the start', function () {
     expect((string) $this->blade('<x-toast position="bottom-start" />'))->toContain('justify-start');
 });
+
+it('marks the snackbar and its action for tests and styling', function () {
+    $html = (string) $this->blade('<x-toast />');
+
+    expect($html)
+        ->toMatch('/<div\s[^>]*\bdata-toast\b[^>]*aria-live="polite"/')
+        ->toMatch('/<button\s[^>]*\bdata-toast-action\b[^>]*x-on:click="act\(\)"/');
+});