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| Original file line number | Diff line number | Diff line change |
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| @@ -1,3 +1,5 @@ | ||
| # docpress-base | ||
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| Base theme for Docpress. | ||
| Base theme for Docpress. See [docpress] for documentation. | ||
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| [docpress]: https://github.com/docpress/docpress |
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| Original file line number | Diff line number | Diff line change |
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| var debounce = require('debounce') | ||
| var documentHeight = require('dom101/document-height') | ||
| var toggleClass = require('dom101/toggle-class') | ||
| var scrollTop = require('dom101/scroll-top') | ||
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| /** | ||
| * Listens for scrolling. | ||
| * Available options: | ||
| * | ||
| * * `parent` (Element) — the parent to listen for scroll events to. Defaults | ||
| * to `document.` | ||
| * * `className` (String) — classname to apply to the function. | ||
| * * `onresize` (Function) — callback to run when the window resizes. Use | ||
| * this to cache metrics. | ||
| * * `onscroll` (Function) — callback to run when scrolling. When this returns | ||
| * true, `className` will be applied; if false, it'll be removed. | ||
| */ | ||
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| function Scrollclass (el, options) { | ||
| if (!(this instanceof Scrollclass)) return new Scrollclass(el, options) | ||
| if (!options) options = {} | ||
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| this.el = q(el) | ||
| this.parent = q(options.parent || document) | ||
| this.className = options.className || 'active' | ||
| this.onresize = (options.onresize || noop).bind(this) | ||
| this.onscroll = (options.onscroll || noop).bind(this) | ||
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| this._onscroll = debounce(this.poll.bind(this), 5) | ||
| this._onresize = debounce(this.update.bind(this), 5) | ||
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| this.listen() | ||
| } | ||
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| /** | ||
| * Fires event listeners. | ||
| */ | ||
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| Scrollclass.prototype.listen = function () { | ||
| window.addEventListener('resize', this._onresize) | ||
| window.addEventListener('resize', this._onscroll) | ||
| this.parent.addEventListener('scroll', this._onscroll) | ||
| this._onresize() | ||
| this._onscroll() | ||
| } | ||
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| /** | ||
| * Destroys all event listeners. | ||
| */ | ||
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| Scrollclass.prototype.destroy = function () { | ||
| window.removeEventListener('resize', this._onresize) | ||
| window.removeEventListener('resize', this._onscroll) | ||
| this.parent.removeEventListener('scroll', this._onscroll) | ||
| } | ||
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| /** | ||
| * Internal: Updates data on window resize. This sets some useful stuff that | ||
| * can be used by the `onscroll` handler. | ||
| */ | ||
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| Scrollclass.prototype.update = function () { | ||
| this.documentHeight = documentHeight() | ||
| this.winHeight = window.innerHeight | ||
| this.maxScroll = this.documentHeight - this.winHeight | ||
| console.log('maxscroll', this.maxScroll, 'w:', this.winHeight, 'd:', documentHeight()) | ||
| this.onresize() | ||
| } | ||
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| /** | ||
| * Internal: scroll handler. | ||
| */ | ||
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| Scrollclass.prototype.poll = function () { | ||
| var result = this.onscroll(scrollTop()) | ||
| toggleClass(this.el, this.className, result) | ||
| } | ||
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| function noop () {} | ||
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| /** | ||
| * Internal: helper to normalize between CSS selectors, DOM elements and | ||
| * jQuery objects. | ||
| */ | ||
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| function q (el) { | ||
| if (typeof el === 'string') return document.querySelector(el) | ||
| else if (typeof el === 'object' && el[0]) return el[0] | ||
| else return el | ||
| } | ||
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| module.exports = Scrollclass |
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