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Use one IntersectionObserver per viewport (#153)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| import Service from '@ember/service'; | ||
| import { bind } from '@ember/runloop'; | ||
|
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| // WeakMap { root: { elements: [{ element, enterCallback, exitCallback }], IntersectionObserver } } | ||
| let DOMRef = new WeakMap(); | ||
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| /** | ||
| * Static administrator to ensure use one IntersectionObserver per viewport | ||
| * Use `root` (viewport) as lookup property | ||
| * `root` will have one IntersectionObserver with many entries (elements) to watch | ||
| * provided callback will ensure consumer of this service is able to react to enter or exit | ||
| * of intersection observer | ||
| * | ||
| * @module Ember.Service | ||
| * @class ObserverAdmin | ||
| */ | ||
| export default class ObserverAdmin extends Service { | ||
| /** | ||
| * adds element to observe entries of IntersectionObserver | ||
| * | ||
| * @method add | ||
| * @param {Node} element | ||
| * @param {Function} enterCallback | ||
| * @param {Function} exitCallback | ||
| * @param {Object} options | ||
| */ | ||
| add(element, enterCallback, exitCallback, options) { | ||
| let { root = window } = options; | ||
| let { elements, intersectionObserver } = this._findRoot(root); | ||
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| if (elements && elements.length > 0) { | ||
| elements.push({ element, enterCallback, exitCallback }); | ||
| intersectionObserver.observe(element, options); | ||
| } else { | ||
| let newIO = new IntersectionObserver(bind(this, this._setupOnIntersection(root)), options); | ||
| newIO.observe(element); | ||
| DOMRef.set(root, { elements: [{ element, enterCallback, exitCallback }], intersectionObserver: newIO }); | ||
| } | ||
| } | ||
|
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| /** | ||
| * @method unobserve | ||
| * @param {Node} element | ||
| * @param {Node|window} root | ||
| */ | ||
| unobserve(element, root) { | ||
| let { intersectionObserver } = this._findRoot(root); | ||
| if (intersectionObserver) { | ||
| intersectionObserver.unobserve(element); | ||
| } | ||
| } | ||
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| /** | ||
| * to unobserver multiple elements | ||
| * | ||
| * @method disconnect | ||
| * @param {Node|window} root | ||
| */ | ||
| disconnect(root) { | ||
| let { intersectionObserver } = this._findRoot(root); | ||
| if (intersectionObserver) { | ||
| intersectionObserver.disconnect(); | ||
| } | ||
| } | ||
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| _setupOnIntersection(root) { | ||
| return function(entries) { | ||
| return this._onAdminIntersection(root, entries); | ||
| } | ||
| } | ||
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| _onAdminIntersection(root, ioEntries) { | ||
| ioEntries.forEach((entry) => { | ||
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| let { isIntersecting, intersectionRatio } = entry; | ||
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| // first determine if entry intersecting | ||
| if (isIntersecting) { | ||
| // then find entry's callback in static administration | ||
| let { elements = [] } = this._findRoot(root); | ||
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| elements.some(({ element, enterCallback }) => { | ||
| if (element === entry.target) { | ||
| // call entry's enter callback | ||
| enterCallback(); | ||
| return true; | ||
| } | ||
| }); | ||
| } else if (intersectionRatio <= 0) { // exiting viewport | ||
| // then find entry's callback in static administration | ||
| let { elements = [] } = this._findRoot(root); | ||
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| elements.some(({ element, exitCallback }) => { | ||
| if (element === entry.target) { | ||
| // call entry's exit callback | ||
| exitCallback(); | ||
| return true; | ||
| } | ||
| }); | ||
| } | ||
| }); | ||
| } | ||
|
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| _findRoot(root) { | ||
| return DOMRef.get(root) || {}; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| export { default } from 'ember-in-viewport/services/-observer-admin'; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| export { default } from 'ember-in-viewport/services/-raf-admin'; |
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