dagre-d3-es/src/dagre-js/label/add-html-label.js

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import * as util from '../util.js';

export { addHtmlLabel };

function addHtmlLabel(root, node) {
  var fo = root.append('foreignObject').attr('width', '100000');

  var div = fo.append('xhtml:div');
  div.attr('xmlns', 'http://www.w3.org/1999/xhtml');

  var label = node.label;
  switch (typeof label) {
    case 'function':
      div.insert(label);
      break;
    case 'object':
      // Currently we assume this is a DOM object.
      div.insert(function () {
        return label;
      });
      break;
    default:
      div.html(label);
  }

  util.applyStyle(div, node.labelStyle);
  div.style('display', 'inline-block');
  // Fix for firefox
  div.style('white-space', 'nowrap');

  var client = div.node();
  fo.attr('width', client.offsetWidth).attr('height', client.offsetHeight);

  return fo;
}