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import { extract } from "$lib/spells/extract.svelte";
import { autoUpdate, computePosition, flip, type Placement } from "@floating-ui/dom";
import type { MaybeGetter } from "melt";
import { Toaster, type ToasterProps } from "melt/builders";
import { createAttachmentKey } from "svelte/attachments";
import type { HTMLAttributes, HTMLButtonAttributes } from "svelte/elements";
type ToastData = {
content: string;
variant: "info" | "danger";
};
const classMap: Record<ToastData["variant"], string> = {
info: "border border-blue-400 bg-gradient-to-b from-blue-500 to-blue-600",
danger: "border border-red-400 bg-gradient-to-b from-red-500 to-red-600",
};
type LocalToastsProps = ToasterProps & {
placement?: MaybeGetter<Placement>;
};
export class LocalToasts {
placement: Placement;
#triggerEl: HTMLButtonElement | null = null;
toaster: Toaster<ToastData>;
constructor(props: LocalToastsProps = {}) {
this.toaster = new Toaster<ToastData>(props);
this.placement = $derived(extract(props.placement, "top"));
}
get addToast() {
return this.toaster.addToast;
}
#triggerAttachment = {
[createAttachmentKey()]: (node: HTMLButtonElement) => {
this.#triggerEl = node;
return () => {
this.#triggerEl = null;
};
},
};
get trigger() {
return {
"data-local-toast-trigger": "",
...this.#triggerAttachment,
} as const satisfies HTMLButtonAttributes;
}
get toasts() {
const original = this.toaster?.toasts;
return original.map(toast => {
const attrs = {
"data-local-toast": "",
"data-variant": toast.data.variant,
[createAttachmentKey()]: node => {
let placement: Placement = $state(this.placement);
const triggerEl = this.#triggerEl;
if (!triggerEl) return;
const compute = () =>
computePosition(triggerEl, node, {
strategy: "absolute",
placement: this.placement,
middleware: [flip()],
}).then(({ x, y, placement: _placement }) => {
placement = _placement;
Object.assign(node.style, {
left: placement.startsWith("top") ? `${x}px` : `${x - 4}px`,
top: placement.startsWith("top") ? `${y - 6}px` : `${y}px`,
});
// Animate
// Cancel any ongoing animations
node.getAnimations().forEach(anim => anim.cancel());
// Determine animation direction based on placement
let keyframes: Keyframe[] = [];
if (placement.startsWith("top")) {
keyframes = [
{ opacity: 0, transform: "translateX(var(--tx, 0)) translateY(8px)", scale: "0.8" },
{ opacity: 1, transform: "translateX(var(--tx, 0)) translateY(0)", scale: "1" },
];
} else if (placement.startsWith("left")) {
keyframes = [
{ opacity: 0, transform: "translateX(8px)", scale: "0.8" },
{ opacity: 1, transform: "translateX(0)", scale: "1" },
];
}
node.animate(keyframes, {
duration: 500,
easing: "cubic-bezier(0.22, 1, 0.36, 1)",
fill: "forwards",
});
});
const reference = node.cloneNode(true) as HTMLElement;
node.before(reference);
reference.style.visibility = "hidden";
const destroyers = [
autoUpdate(triggerEl, node, compute),
async () => {
// clone node
const cloned = node.cloneNode(true) as HTMLElement;
reference.before(cloned);
reference.remove();
cloned.getAnimations().forEach(anim => anim.cancel());
// Animate out
// Cancel any ongoing animations
cloned.getAnimations().forEach(anim => anim.cancel());
// Determine animation direction based on placement
let keyframes: Keyframe[] = [];
if (placement.startsWith("top")) {
keyframes = [
{ opacity: 1, transform: "translateX(var(--tx, 0)) translateY(0)" },
{ opacity: 0, transform: "translateX(var(--tx, 0)) translateY(-8px)" },
];
} else if (placement.startsWith("left")) {
keyframes = [
{ opacity: 1, transform: "translateX(0)" },
{ opacity: 0, transform: "translateX(-8px)" },
];
}
await cloned.animate(keyframes, {
duration: 400,
easing: "cubic-bezier(0.22, 1, 0.36, 1)",
fill: "forwards",
}).finished;
cloned.remove();
},
];
return () => destroyers.forEach(d => d());
},
"style": `
/* Float on top of the UI */
position: absolute;
z-index: 100;
/* Avoid layout interference */
width: max-content;
top: 0;
left: 0;
`,
} as const satisfies HTMLAttributes<HTMLElement>;
return Object.assign(toast, {
class: `${classMap[toast.data.variant]} rounded-full px-2 py-1 text-xs`,
attrs,
});
});
}
}
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