antd/lib/input/calculateNodeHeight.js

An enterprise-class UI design language and React-based implementation

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = calculateNodeHeight;
// Thanks to https://github.com/andreypopp/react-textarea-autosize/

/**
 * calculateNodeHeight(uiTextNode, useCache = false)
 */

var 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';

var SIZING_STYLE = ['letter-spacing', 'line-height', 'padding-top', 'padding-bottom', 'font-family', 'font-weight', 'font-size', 'text-rendering', 'text-transform', 'width', 'text-indent', 'padding-left', 'padding-right', 'border-width', 'box-sizing'];

var computedStyleCache = {};
var hiddenTextarea = void 0;

function computedStyle(node) {
  return window.getComputedStyle ? getComputedStyle(node) : node.currentStyle;
}

function getStylePropertyValue(style, prop) {
  var value = void 0;
  if (style) {
    value = window.getComputedStyle ? style.getPropertyValue(prop) : style[prop.replace(/-(\w)/gi, function (word, letter) {
      return letter.toUpperCase();
    })];
  }
  return value;
}

function calculateNodeStyling(node) {
  var useCache = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

  var nodeRef = node.getAttribute('id') || node.getAttribute('data-reactid') || node.getAttribute('name');

  if (useCache && computedStyleCache[nodeRef]) {
    return computedStyleCache[nodeRef];
  }

  var style = computedStyle(node);

  var boxSizing = getStylePropertyValue(style, 'box-sizing') || getStylePropertyValue(style, '-moz-box-sizing') || getStylePropertyValue(style, '-webkit-box-sizing');

  var paddingSize = parseFloat(getStylePropertyValue(style, 'padding-bottom')) + parseFloat(getStylePropertyValue(style, 'padding-top'));

  var borderSize = parseFloat(getStylePropertyValue(style, 'border-bottom-width')) + parseFloat(getStylePropertyValue(style, 'border-top-width'));

  var sizingStyle = SIZING_STYLE.map(function (name) {
    return name + ':' + getStylePropertyValue(style, name);
  }).join(';');

  var nodeInfo = {
    sizingStyle: sizingStyle,
    paddingSize: paddingSize,
    borderSize: borderSize,
    boxSizing: boxSizing
  };

  if (useCache && nodeRef) {
    computedStyleCache[nodeRef] = nodeInfo;
  }

  return nodeInfo;
}

function calculateNodeHeight(uiTextNode) {
  var useCache = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  var minRows = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;
  var maxRows = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;

  if (!hiddenTextarea) {
    hiddenTextarea = document.createElement('textarea');
    document.body.appendChild(hiddenTextarea);
  }

  // Copy all CSS properties that have an impact on the height of the content in
  // the textbox

  var _calculateNodeStyling = calculateNodeStyling(uiTextNode, useCache),
      paddingSize = _calculateNodeStyling.paddingSize,
      borderSize = _calculateNodeStyling.borderSize,
      boxSizing = _calculateNodeStyling.boxSizing,
      sizingStyle = _calculateNodeStyling.sizingStyle;

  // Need to have the overflow attribute to hide the scrollbar otherwise
  // text-lines will not calculated properly as the shadow will technically be
  // narrower for content


  hiddenTextarea.setAttribute('style', sizingStyle + ';' + HIDDEN_TEXTAREA_STYLE);
  hiddenTextarea.value = uiTextNode.value || uiTextNode.placeholder || '';

  var minHeight = -Infinity;
  var maxHeight = Infinity;
  var height = hiddenTextarea.scrollHeight;

  if (boxSizing === 'border-box') {
    // border-box: add border, since height = content + padding + border
    height = height + borderSize;
  } else if (boxSizing === 'content-box') {
    // remove padding, since height = content
    height = height - paddingSize;
  }

  if (minRows !== null || maxRows !== null) {
    // measure height of a textarea with a single row
    hiddenTextarea.value = '';
    var singleRowHeight = hiddenTextarea.scrollHeight - paddingSize;
    if (minRows !== null) {
      minHeight = singleRowHeight * minRows;
      if (boxSizing === 'border-box') {
        minHeight = minHeight + paddingSize + borderSize;
      }
      height = Math.max(minHeight, height);
    }
    if (maxRows !== null) {
      maxHeight = singleRowHeight * maxRows;
      if (boxSizing === 'border-box') {
        maxHeight = maxHeight + paddingSize + borderSize;
      }
      height = Math.min(maxHeight, height);
    }
  }
  return { height: height, minHeight: minHeight, maxHeight: maxHeight };
}
module.exports = exports['default'];