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154 lines
4.0 KiB
TypeScript
154 lines
4.0 KiB
TypeScript
// 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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let 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: number | null = null,
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maxRows: number | null = 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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let {
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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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let 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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return { height, minHeight, maxHeight, overflowY };
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}
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