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