2017-12-06 10:54:20 +00:00
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// Thanks to https://github.com/andreypopp/react-textarea-autosize/
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/**
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* calculateNodeHeight(uiTextNode, useCache = false)
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*/
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const HIDDEN_TEXTAREA_STYLE = `
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min-height:0 !important;
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max-height:none !important;
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height:0 !important;
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visibility:hidden !important;
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overflow:hidden !important;
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position:absolute !important;
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z-index:-1000 !important;
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top:0 !important;
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right:0 !important
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`
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const SIZING_STYLE = [
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'letter-spacing',
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'line-height',
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'padding-top',
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'padding-bottom',
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'font-family',
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'font-weight',
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'font-size',
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'text-rendering',
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'text-transform',
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'width',
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'text-indent',
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'padding-left',
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'padding-right',
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'border-width',
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'box-sizing',
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]
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const computedStyleCache = {}
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let hiddenTextarea
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function calculateNodeStyling (node, useCache = false) {
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const nodeRef = (
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node.getAttribute('id') ||
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node.getAttribute('data-reactid') ||
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node.getAttribute('name')
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)
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if (useCache && computedStyleCache[nodeRef]) {
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return computedStyleCache[nodeRef]
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}
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const style = window.getComputedStyle(node)
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const boxSizing = (
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style.getPropertyValue('box-sizing') ||
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style.getPropertyValue('-moz-box-sizing') ||
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style.getPropertyValue('-webkit-box-sizing')
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)
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const paddingSize = (
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parseFloat(style.getPropertyValue('padding-bottom')) +
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parseFloat(style.getPropertyValue('padding-top'))
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)
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const borderSize = (
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parseFloat(style.getPropertyValue('border-bottom-width')) +
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parseFloat(style.getPropertyValue('border-top-width'))
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)
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const sizingStyle = SIZING_STYLE
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.map(name => `${name}:${style.getPropertyValue(name)}`)
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.join(';')
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const nodeInfo = {
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sizingStyle,
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paddingSize,
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borderSize,
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boxSizing,
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}
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if (useCache && nodeRef) {
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computedStyleCache[nodeRef] = nodeInfo
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}
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return nodeInfo
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}
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export default function calculateNodeHeight (
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uiTextNode,
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useCache = false,
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minRows = null,
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maxRows = null,
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) {
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if (!hiddenTextarea) {
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hiddenTextarea = document.createElement('textarea')
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document.body.appendChild(hiddenTextarea)
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}
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// Fix wrap="off" issue
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// https://github.com/ant-design/ant-design/issues/6577
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if (uiTextNode.getAttribute('wrap')) {
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hiddenTextarea.setAttribute('wrap', uiTextNode.getAttribute('wrap'))
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} else {
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hiddenTextarea.removeAttribute('wrap')
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}
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// Copy all CSS properties that have an impact on the height of the content in
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// the textbox
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const {
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paddingSize, borderSize,
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boxSizing, sizingStyle,
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} = calculateNodeStyling(uiTextNode, useCache)
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// Need to have the overflow attribute to hide the scrollbar otherwise
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// text-lines will not calculated properly as the shadow will technically be
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// narrower for content
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hiddenTextarea.setAttribute('style', `${sizingStyle};${HIDDEN_TEXTAREA_STYLE}`)
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hiddenTextarea.value = uiTextNode.value || uiTextNode.placeholder || ''
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let minHeight = -Infinity
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let maxHeight = Infinity
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let height = hiddenTextarea.scrollHeight
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let overflowY
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if (boxSizing === 'border-box') {
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// border-box: add border, since height = content + padding + border
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height = height + borderSize
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} else if (boxSizing === 'content-box') {
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// remove padding, since height = content
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height = height - paddingSize
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}
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if (minRows !== null || maxRows !== null) {
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// measure height of a textarea with a single row
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hiddenTextarea.value = ''
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const singleRowHeight = hiddenTextarea.scrollHeight - paddingSize
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if (minRows !== null) {
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minHeight = singleRowHeight * minRows
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if (boxSizing === 'border-box') {
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minHeight = minHeight + paddingSize + borderSize
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}
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height = Math.max(minHeight, height)
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}
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if (maxRows !== null) {
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maxHeight = singleRowHeight * maxRows
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if (boxSizing === 'border-box') {
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maxHeight = maxHeight + paddingSize + borderSize
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}
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overflowY = height > maxHeight ? '' : 'hidden'
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height = Math.min(maxHeight, height)
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}
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}
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// Remove scroll bar flash when autosize without maxRows
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if (!maxRows) {
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overflowY = 'hidden'
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}
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2017-12-07 04:31:12 +00:00
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return { height: `${height}px`, minHeight: `${minHeight}px`, maxHeight: `${maxHeight}px`, overflowY }
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2017-12-06 10:54:20 +00:00
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}
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