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Merge pull request #29 from gtm-nayan/generic-action-type
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| { | ||
| "useTabs": true, | ||
| "printWidth": 100, | ||
| "singleQuote": true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,35 +1,34 @@ | ||
| import { Action } from './types'; | ||
|
|
||
| export interface ClickOutsideConfig { | ||
| enabled: boolean; | ||
| cb: (node: HTMLElement) => void; | ||
| } | ||
| /** | ||
| * | ||
| * Call callback when user clicks outside a given element | ||
| * | ||
| * Usage: | ||
| * | ||
| * @example | ||
| * ```svelte | ||
| * <div use:clickOutside={{ enabled: open, cb: () => open = false }}> | ||
| * | ||
| * ``` | ||
| * Demo: https://svelte.dev/repl/dae848c2157e48ab932106779960f5d5?version=3.19.2 | ||
| * | ||
| */ | ||
| export function clickOutside(node: HTMLElement, params: {enabled: boolean, cb: Function }): ReturnType<Action> { | ||
| const { enabled: initialEnabled, cb } = params | ||
|
|
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| const handleOutsideClick = ({ target }: MouseEvent) => { | ||
| if (!node.contains(target as Node)) cb(node); // typescript hack, not sure how to solve without asserting as Node | ||
| }; | ||
| export const clickOutside: Action<ClickOutsideConfig> = (node, config) => { | ||
| function handler(e: MouseEvent) { | ||
| if (!node.contains(e.target as Node)) config.cb(node); | ||
| } | ||
|
|
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| function update({enabled}: {enabled: boolean}) { | ||
| if (enabled) { | ||
| window.addEventListener('click', handleOutsideClick); | ||
| } else { | ||
| window.removeEventListener('click', handleOutsideClick); | ||
| } | ||
| } | ||
| update({ enabled: initialEnabled }); | ||
| return { | ||
| update, | ||
| destroy() { | ||
| window.removeEventListener( 'click', handleOutsideClick ); | ||
| } | ||
| }; | ||
| function set_handler(enabled: boolean) { | ||
| (enabled ? window.addEventListener : window.removeEventListener)('click', handler); | ||
| } | ||
| set_handler(config.enabled); | ||
|
|
||
| } | ||
| return { | ||
| update(params) { | ||
| set_handler((config = params).enabled); | ||
| }, | ||
| destroy() { | ||
| set_handler(false); | ||
| }, | ||
| }; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,45 +1,35 @@ | ||
| import { Action } from './types'; | ||
| const node_attributes_map = new WeakMap<HTMLElement, object>(); | ||
|
|
||
| const intersection_handler: IntersectionObserverCallback = (entries) => { | ||
| entries.forEach((entry) => { | ||
| if (entry.isIntersecting && entry.target instanceof HTMLElement) { | ||
| const node = entry.target; | ||
| Object.assign(node, node_attributes_map.get(node)); | ||
| lazy_load_observer.unobserve(node); | ||
| } | ||
| }); | ||
| }; | ||
|
|
||
| let lazy_load_observer: IntersectionObserver; | ||
| function observer() { | ||
| return (lazy_load_observer ??= new IntersectionObserver(intersection_handler)); | ||
| } | ||
| /** | ||
| * Attach onto any image to lazy load it | ||
| * | ||
| * Set attributes on an element when it is visible in the viewport. | ||
| *@example | ||
| *```svelte | ||
| * <img use:lazyLoad={{src:"/myimage"}} alt=""> | ||
| * | ||
| *``` | ||
| * Demo: https://svelte.dev/repl/f12988de576b4bf9b541a2a59eb838f6?version=3.23.2 | ||
| * | ||
| * | ||
| */ | ||
| const lazyLoadHandleIntersection: IntersectionObserverCallback = (entries) => { | ||
| entries.forEach( | ||
| entry => { | ||
| if (!entry.isIntersecting) { | ||
| return | ||
| } | ||
|
|
||
| if (!(entry.target instanceof HTMLElement)) { | ||
| return; | ||
| } | ||
|
|
||
| let node = entry.target; | ||
| let attributes = lazyLoadNodeAttributes.find(item => item.node === node)?.attributes | ||
| Object.assign(node, attributes) | ||
|
|
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| lazyLoadObserver.unobserve(node) | ||
| } | ||
| ) | ||
| } | ||
|
|
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| let lazyLoadObserver: IntersectionObserver; | ||
| let lazyLoadNodeAttributes: Array<{node: HTMLElement, attributes: Object}> = [] | ||
| export function lazyload(node: HTMLElement, attributes: Object): ReturnType<Action> { | ||
| if (!lazyLoadObserver) { | ||
| lazyLoadObserver = new IntersectionObserver(lazyLoadHandleIntersection); | ||
| } | ||
| lazyLoadNodeAttributes.push({node, attributes}) | ||
|
|
||
| lazyLoadObserver.observe(node); | ||
| export const lazyload: Action<object> = (node, attributes) => { | ||
| node_attributes_map.set(node, attributes); | ||
| observer().observe(node); | ||
| return { | ||
| destroy() { | ||
| lazyLoadObserver.unobserve(node); | ||
| } | ||
| observer().unobserve(node); | ||
| }, | ||
| }; | ||
| } | ||
| }; |
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