d2-ui/node_modules-react-15/draft-js/lib/DraftEditorTextNode.react.js

d2-ui

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule DraftEditorTextNode.react
 * @typechecks
 * 
 */

'use strict';

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; desc = parent = undefined; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var React = require('react');
var ReactDOM = require('react-dom');
var UserAgent = require('fbjs/lib/UserAgent');

// In IE, spans with <br> tags render as two newlines. By rendering a span
// with only a newline character, we can be sure to render a single line.
var useNewlineChar = UserAgent.isBrowser('IE <= 11');

/**
 * Check whether the node should be considered a newline.
 */
function isNewline(node) {
  return useNewlineChar ? node.textContent === '\n' : node.tagName === 'BR';
}

/**
 * Placeholder elements for empty text content.
 *
 * What is this `data-text` attribute, anyway? It turns out that we need to
 * put an attribute on the lowest-level text node in order to preserve correct
 * spellcheck handling. If the <span> is naked, Chrome and Safari may do
 * bizarre things to do the DOM -- split text nodes, create extra spans, etc.
 * If the <span> has an attribute, this appears not to happen.
 * See http://jsfiddle.net/9khdavod/ for the failure case, and
 * http://jsfiddle.net/7pg143f7/ for the fixed case.
 */
var NEWLINE_A = useNewlineChar ? React.createElement(
  'span',
  { key: 'A', 'data-text': 'true' },
  '\n'
) : React.createElement('br', { key: 'A', 'data-text': 'true' });

var NEWLINE_B = useNewlineChar ? React.createElement(
  'span',
  { key: 'B', 'data-text': 'true' },
  '\n'
) : React.createElement('br', { key: 'B', 'data-text': 'true' });

/**
 * The lowest-level component in a `DraftEditor`, the text node component
 * replaces the default React text node implementation. This allows us to
 * perform custom handling of newline behavior and avoid re-rendering text
 * nodes with DOM state that already matches the expectations of our immutable
 * editor state.
 */

var DraftEditorTextNode = (function (_React$Component) {
  _inherits(DraftEditorTextNode, _React$Component);

  function DraftEditorTextNode(props) {
    _classCallCheck(this, DraftEditorTextNode);

    _get(Object.getPrototypeOf(DraftEditorTextNode.prototype), 'constructor', this).call(this, props);
    this._forceFlag = false;
  }

  _createClass(DraftEditorTextNode, [{
    key: 'shouldComponentUpdate',
    value: function shouldComponentUpdate(nextProps) {
      var node = ReactDOM.findDOMNode(this);
      var shouldBeNewline = nextProps.children === '';
      if (shouldBeNewline) {
        return !isNewline(node);
      }
      return node.textContent !== nextProps.children;
    }
  }, {
    key: 'componentWillUpdate',
    value: function componentWillUpdate() {
      // By flipping this flag, we also keep flipping keys which forces
      // React to remount this node every time it rerenders.
      this._forceFlag = !this._forceFlag;
    }
  }, {
    key: 'render',
    value: function render() {
      if (this.props.children === '') {
        return this._forceFlag ? NEWLINE_A : NEWLINE_B;
      }
      return React.createElement(
        'span',
        { key: this._forceFlag ? 'A' : 'B', 'data-text': 'true' },
        this.props.children
      );
    }
  }]);

  return DraftEditorTextNode;
})(React.Component);

module.exports = DraftEditorTextNode;