choerodon-ui/lib/input/calculateNodeHeight.js

"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;

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 = window.getComputedStyle(node);
  var boxSizing = style.getPropertyValue('box-sizing') || style.getPropertyValue('-moz-box-sizing') || style.getPropertyValue('-webkit-box-sizing');
  var paddingSize = parseFloat(style.getPropertyValue('padding-bottom')) + parseFloat(style.getPropertyValue('padding-top'));
  var borderSize = parseFloat(style.getPropertyValue('border-bottom-width')) + parseFloat(style.getPropertyValue('border-top-width'));
  var sizingStyle = SIZING_STYLE.map(function (name) {
    return "".concat(name, ":").concat(style.getPropertyValue(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);
  } // Fix wrap="off" issue


  if (uiTextNode.getAttribute('wrap')) {
    hiddenTextarea.setAttribute('wrap', uiTextNode.getAttribute('wrap'));
  } else {
    hiddenTextarea.removeAttribute('wrap');
  } // 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', "".concat(sizingStyle, ";").concat(HIDDEN_TEXTAREA_STYLE));
  hiddenTextarea.value = uiTextNode.value || uiTextNode.placeholder || '';
  var minHeight = Number.MIN_SAFE_INTEGER;
  var maxHeight = Number.MAX_SAFE_INTEGER;
  var height = hiddenTextarea.scrollHeight;
  var overflowY;

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

      overflowY = height > maxHeight ? '' : 'hidden';
      height = Math.min(maxHeight, height);
    }
  } // Remove scroll bar flash when autosize without maxRows


  if (!maxRows) {
    overflowY = 'hidden';
  }

  return {
    height: height,
    minHeight: minHeight,
    maxHeight: maxHeight,
    overflowY: overflowY
  };
}
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