142 lines
3.6 KiB
JavaScript
142 lines
3.6 KiB
JavaScript
// Modified from https://github.com/jackmoore/autosize/blob/113f1b3/src/autosize.js
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// The only change is to remove IE-specific hacks,
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// remove parent overflow checks, make page resizes more performant,
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// add deferredUpdate, and add perf marks.
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import { mark, stop } from './marks'
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import debounce from 'lodash-es/debounce'
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import throttle from 'lodash-es/throttle'
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const map = new Map()
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let createEvent = (name) => new Event(name, {bubbles: true})
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function assign (ta) {
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if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || map.has(ta)) {
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return
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}
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// TODO: hack - grab our scroll container so we can maintain the scrollTop
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let container = document.getElementsByClassName('container')[0]
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let heightOffset = null
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let cachedHeight = null
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function init () {
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const style = window.getComputedStyle(ta, null)
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if (style.boxSizing === 'content-box') {
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heightOffset = -(parseFloat(style.paddingTop) + parseFloat(style.paddingBottom))
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} else {
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heightOffset = parseFloat(style.borderTopWidth) + parseFloat(style.borderBottomWidth)
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}
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update()
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}
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function resize () {
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mark('autosize:resize()')
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let res = _resize()
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stop('autosize:resize()')
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return res
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}
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function _resize () {
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const originalHeight = ta.style.height
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const scrollTop = container.scrollTop
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ta.style.height = '' // this may change the scrollTop in Firefox
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const endHeight = ta.scrollHeight + heightOffset
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if (ta.scrollHeight === 0) {
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// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
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ta.style.height = originalHeight
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return
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}
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ta.style.height = endHeight + 'px'
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container.scrollTop = scrollTop // Firefox jiggles if we don't reset the scrollTop of the container
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return endHeight
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}
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const deferredUpdate = throttle(() => requestAnimationFrame(update), 100)
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function update () {
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mark('autosize:update()')
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_update()
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stop('autosize:update()')
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}
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function _update () {
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let newHeight = resize()
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if (cachedHeight !== newHeight) {
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cachedHeight = newHeight
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const evt = createEvent('autosize:resized')
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try {
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ta.dispatchEvent(evt)
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} catch (err) {
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// Firefox will throw an error on dispatchEvent for a detached element
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// https://bugzilla.mozilla.org/show_bug.cgi?id=889376
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}
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}
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}
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const pageResize = debounce(() => requestAnimationFrame(update), 1000)
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const destroy = () => {
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window.removeEventListener('resize', pageResize, false)
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ta.removeEventListener('input', deferredUpdate, false)
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ta.removeEventListener('autosize:destroy', destroy, false)
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ta.removeEventListener('autosize:update', update, false)
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map.delete(ta)
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}
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ta.addEventListener('autosize:destroy', destroy, false)
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window.addEventListener('resize', pageResize, false)
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ta.addEventListener('input', deferredUpdate, false)
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ta.addEventListener('autosize:update', update, false)
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map.set(ta, {
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destroy,
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update
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})
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init()
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}
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function destroy (ta) {
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const methods = map.get(ta)
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if (methods) {
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methods.destroy()
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}
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}
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function update (ta) {
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const methods = map.get(ta)
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if (methods) {
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methods.update()
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}
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}
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let autosize = (el, options) => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], x => assign(x, options))
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}
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return el
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}
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autosize.destroy = el => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], destroy)
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}
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return el
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}
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autosize.update = el => {
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if (el) {
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Array.prototype.forEach.call(el.length ? el : [el], update)
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}
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return el
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}
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export { autosize }
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