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Popper.svelte
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Popper.svelte
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<script lang="ts">
import { onMount } from 'svelte';
import { createPopper, type Rect } from '@popperjs/core';
import classNames from 'classnames';
import type { Placement, Instance } from '@popperjs/core';
import createEventDispatcher from './createEventDispatcher';
import Frame from './Frame.svelte';
export let activeContent: boolean = false;
export let arrow: boolean = true;
export let offset: number = 8;
export let placement: Placement = 'top';
export let trigger: 'hover' | 'click' = 'hover';
export let triggeredBy: string | undefined = undefined;
export let strategy: 'absolute' | 'fixed' = 'absolute';
export let open: boolean = false;
export let yOnly: boolean = false;
const dispatch = createEventDispatcher();
let clickable: boolean;
$: clickable = trigger === 'click';
$: dispatch('show', triggerEl, open);
let triggerEl: Element;
let contentEl: HTMLElement;
let triggerEls: HTMLElement[] = [];
let popper: Instance;
let _blocked: boolean = false; // managment of the race condition between focusin and click events
const block = () => ((_blocked = true), setTimeout(() => (_blocked = false), 250));
const showHandler = (ev: Event) => {
if (triggerEl === undefined) console.error('trigger undefined');
if (triggerEls.includes(ev.target as HTMLElement) && triggerEl !== ev.target) {
triggerEl = ev.target as HTMLElement;
block();
}
if (clickable && ev.type === 'focusin' && !open) block();
open = clickable && ev.type === 'click' && !_blocked ? !open : true;
};
// reactivity
$: popper && popper.setOptions({ placement });
// typescript typeguards - poper.state.element.reference: Element|HTMLElement|VirtualElement
const hasHover = (el: object) => (el as Element).matches && (el as Element).matches(':hover');
const hasFocus = (el: object) =>
(el as Element).contains && (el as Element).contains(document.activeElement);
const hideHandler = (ev: Event) => {
if (activeContent) {
setTimeout(() => {
const elements = Object.values(popper?.state.elements ?? {});
if (ev.type === 'mouseleave' && elements.some(hasHover)) return;
if (ev.type === 'focusout' && elements.some(hasFocus)) return;
open = false;
}, 100);
} else open = false;
};
function init(node: HTMLElement, _triggerEl: HTMLElement) {
popper = createPopper(_triggerEl, node, {
placement,
strategy,
modifiers: [
{
name: 'offset',
options: {
offset: ({ reference, popper }: { reference: Rect; popper: Rect }) => {
// for full screen mega menu
return [yOnly ? popper.width / 2 - reference.width / 2 - reference.x : 0, offset];
}
}
},
{ name: 'eventListeners', enabled: open },
{ name: 'flip', enabled: false }
]
});
return {
update(_triggerEl: HTMLElement) {
popper.state.elements.reference = _triggerEl;
popper.update();
},
destroy() {
popper.destroy();
}
};
}
onMount(() => {
const events: [string, any, boolean][] = [
['focusin', showHandler, true],
['focusout', hideHandler, true],
['click', showHandler, clickable],
['mouseenter', showHandler, !clickable],
['mouseleave', hideHandler, !clickable]
];
if (triggeredBy) triggerEls = [...document.querySelectorAll<HTMLElement>(triggeredBy)];
else
triggerEls = contentEl.previousElementSibling ? [contentEl.previousElementSibling as HTMLElement] : [];
if (!triggerEls.length) {
console.error('No triggers found.');
}
triggerEls.forEach((element: HTMLElement) => {
if (element.tabIndex < 0) element.tabIndex = 0; // trigger must be focusable
for (const [name, handler, cond] of events) if (cond) element.addEventListener(name, handler);
});
triggerEl = triggerEls[0];
return () => {
triggerEls.forEach((element: HTMLElement) => {
if (element) {
for (const [name, handler] of events) element.removeEventListener(name, handler);
}
});
};
});
function optional(pred: boolean, func: (ev: Event) => void) {
return (pred && func) || null;
}
</script>
{#if !triggerEl}
<div bind:this={contentEl} />
{/if}
{#if open && triggerEl}
<Frame
use={init}
options={triggerEl}
role="tooltip"
tabIndex={activeContent ? -1 : undefined}
on:focusin={optional(activeContent, showHandler)}
on:focusout={optional(activeContent, hideHandler)}
on:mouseenter={optional(activeContent && !clickable, showHandler)}
on:mouseleave={optional(activeContent && !clickable, hideHandler)}
{...$$restProps}
class={classNames('z-10 outline-none', $$props.class)}>
<slot />
{#if arrow}<div data-popper-arrow class="tooltip-arrow" />{/if}
</Frame>
{/if}