DEV: toasts improvements (#24046)

- more subtle animation when showing a toast
- resumes auto close when removing the mouse from the toast
- correctly follows reduced motion
- uses output with role status as element: https://web.dev/articles/building/a-toast-component
- shows toasts inside a section element
- prevents toast to all have the same width
- fixes a bug on mobile where we would limit the width and the close button wouldn't show correctly aligned

I would prefer to have tests for this, but the conjunction of css/animations and our helper changing `discourseLater` to 0 in tests is making it quite challenging for a rather low value. We have system specs using  toasts ensuring they show when they should.

app/assets/javascripts/float-kit/addon/components/d-toasts.gjs

@@ -1,27 +1,88 @@
 import Component from "@glimmer/component";
-import { on } from "@ember/modifier";
+import { registerDestructor } from "@ember/destroyable";
+import { cancel } from "@ember/runloop";
 import { inject as service } from "@ember/service";
+import Modifier from "ember-modifier";
 import concatClass from "discourse/helpers/concat-class";
+import discourseLater from "discourse-common/lib/later";
+import { bind } from "discourse-common/utils/decorators";
+
+const CSS_TRANSITION_DELAY_MS = 300;
+const TRANSITION_CLASS = "-fade-out";
+
+class AutoCloseToast extends Modifier {
+  element;
+  close;
+  duration;
+  transitionLaterHandler;
+  closeLaterHandler;
+
+  constructor(owner, args) {
+    super(owner, args);
+
+    registerDestructor(this, (instance) => instance.cleanup());
+  }
+
+  modify(element, _, { close, duration }) {
+    this.element = element;
+    this.close = close;
+    this.duration = duration;
+    this.element.addEventListener("mouseenter", this.stopTimer, {
+      passive: true,
+    });
+    this.element.addEventListener("mouseleave", this.startTimer, {
+      passive: true,
+    });
+    this.startTimer();
+  }
+
+  @bind
+  startTimer() {
+    this.transitionLaterHandler = discourseLater(() => {
+      this.element.classList.add(TRANSITION_CLASS);
+
+      this.closeLaterHandler = discourseLater(() => {
+        this.close();
+      }, CSS_TRANSITION_DELAY_MS);
+    }, this.duration);
+  }
+
+  @bind
+  stopTimer() {
+    cancel(this.transitionLaterHandler);
+    cancel(this.closeLaterHandler);
+  }
+
+  cleanup() {
+    this.stopTimer();
+    this.element.removeEventListener("mouseenter", this.stopTimer);
+    this.element.removeEventListener("mouseleave", this.startTimer);
+  }
+}
 
 export default class DToasts extends Component {
   @service toasts;
 
   <template>
-    <div class="fk-d-toasts">
+    <section class="fk-d-toasts">
       {{#each this.toasts.activeToasts as |toast|}}
-        <div
+        <output
           role={{if toast.options.autoClose "status" "log"}}
           key={{toast.id}}
           class={{concatClass "fk-d-toast" toast.options.class}}
-          {{(if toast.options.autoClose (modifier toast.registerAutoClose))}}
-          {{on "mouseenter" toast.cancelAutoClose}}
+          {{(if
+            toast.options.autoClose
+            (modifier
+              AutoCloseToast close=toast.close duration=toast.options.duration
+            )
+          )}}
         >
           <toast.options.component
             @data={{toast.options.data}}
             @close={{toast.close}}
           />
-        </div>
+        </output>
       {{/each}}
-    </div>
+    </section>
   </template>
 }

app/assets/javascripts/float-kit/addon/lib/constants.js

@@ -70,7 +70,6 @@ import DDefaultToast from "float-kit/components/d-default-toast";
 export const TOAST = {
   options: {
     autoClose: true,
-    forceAutoClose: false,
     duration: 3000,
     component: DDefaultToast,
   },

app/assets/javascripts/float-kit/addon/lib/d-toast-instance.js

@@ -1,38 +1,14 @@
 import { setOwner } from "@ember/application";
 import { action } from "@ember/object";
-import { cancel } from "@ember/runloop";
 import { inject as service } from "@ember/service";
-import { modifier } from "ember-modifier";
 import uniqueId from "discourse/helpers/unique-id";
-import discourseLater from "discourse-common/lib/later";
 import { TOAST } from "float-kit/lib/constants";
 
-const CSS_TRANSITION_DELAY_MS = 500;
-const TRANSITION_CLASS = "-fade-out";
-
 export default class DToastInstance {
   @service toasts;
 
   options = null;
   id = uniqueId();
-  autoCloseHandler = null;
-
-  registerAutoClose = modifier((element) => {
-    let innerHandler;
-
-    this.autoCloseHandler = discourseLater(() => {
-      element.classList.add(TRANSITION_CLASS);
-
-      innerHandler = discourseLater(() => {
-        this.close();
-      }, CSS_TRANSITION_DELAY_MS);
-    }, this.options.duration || TOAST.options.duration);
-
-    return () => {
-      cancel(innerHandler);
-      cancel(this.autoCloseHandler);
-    };
-  });
 
   constructor(owner, options = {}) {
     setOwner(this, owner);
@@ -43,14 +19,4 @@ export default class DToastInstance {
   close() {
     this.toasts.close(this);
   }
-
-  @action
-  cancelAutoClose() {
-    if (this.options.forceAutoClose) {
-      // Return early so that we do not cancel the autoClose timer.
-      return;
-    }
-
-    cancel(this.autoCloseHandler);
-  }
 }

app/assets/javascripts/float-kit/addon/services/toasts.js

@@ -15,7 +15,6 @@ export default class Toasts extends Service {
    * @param {Object} [options] - options passed to the toast component as `@toast` argument
    * @param {String} [options.duration] - The duration (ms) of the toast, will be closed after this time
    * @param {Boolean} [options.autoClose=true] - When true, the toast will autoClose after the duration
-   * @param {Boolean} [options.forceAutoClose=false] - When true, toast will still autoClose following mouseover event
    * @param {ComponentClass} [options.component] - A component to render, will use `DDefaultToast` if not provided
    * @param {String} [options.class] - A class added to the d-toast element
    * @param {Object} [options.data] - An object which will be passed as the `@data` argument to the component

app/assets/stylesheets/common/float-kit/d-default-toast.scss

@@ -1,7 +1,6 @@
 .fk-d-default-toast {
   display: flex;
   flex: 1 1 auto;
-  max-width: 350px;
   padding: 0.5rem;
 
   &__close-container {

app/assets/stylesheets/common/float-kit/d-toasts.scss

@@ -1,16 +1,12 @@
 @keyframes d-toast-opening {
-  0% {
-    transform: translateX(0px);
-  }
-  50% {
-    transform: translateX(-5px);
-  }
-  100% {
-    transform: translateX(0px);
+  from {
+    transform: translateY(var(--transform-y, 10px));
   }
 }
 
 .fk-d-toasts {
+  --transform-y: 0;
+
   position: fixed;
   top: 5px;
   right: 5px;
@@ -18,6 +14,7 @@
   display: flex;
   flex-direction: column;
   gap: 5px 0;
+  flex: 1 1 auto;
 
   .mobile-view & {
     left: 5px;
@@ -34,7 +31,12 @@
     box-shadow: var(--shadow-menu-panel);
     overflow-wrap: break-word;
     display: flex;
-    animation: d-toast-opening 0.5s ease-in-out;
+    animation: d-toast-opening 0.3s ease-in-out;
+    will-change: transform;
+
+    .desktop-view & {
+      margin-left: auto;
+    }
 
     &:hover {
       border-color: var(--primary-300);
@@ -49,3 +51,9 @@
     }
   }
 }
+
+@media (prefers-reduced-motion: no-preference) {
+  .fk-d-toasts {
+    --transform-y: 2vh;
+  }
+}