text: /**
   * Plugin.js
   *
   * Released under LGPL License.
   * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
   *
   * License: http://www.tinymce.com/license
   * Contributing: http://www.tinymce.com/contributing
   */
  
  /**
   * This class contains all core logic for the preview plugin.
   *
   * @class tinymce.preview.Plugin
   * @private
   */
  define(
    'tinymce.plugins.preview.Plugin',
    [
      'tinymce.core.PluginManager',
      'tinymce.core.Env',
      'tinymce.core.util.Tools'
    ],
    function (PluginManager, Env, Tools) {
      PluginManager.add('preview', function (editor) {
        var settings = editor.settings, sandbox = !Env.ie;
  
        editor.addCommand('mcePreview', function () {
          editor.windowManager.open({
            title: 'Preview',
            width: parseInt(editor.getParam("plugin_preview_width", "650"), 10),
            height: parseInt(editor.getParam("plugin_preview_height", "500"), 10),
            html: '<iframe src="javascript:\'\'" frameborder="0"' + (sandbox ? ' sandbox="allow-scripts"' : '') + '></iframe>',
            buttons: {
              text: 'Close',
              onclick: function () {
                this.parent().parent().close();
              }
            },
            onPostRender: function () {
              var previewHtml, headHtml = '', encode = editor.dom.encode;
  
              headHtml += '<base href="' + encode(editor.documentBaseURI.getURI()) + '">';
  
              Tools.each(editor.contentCSS, function (url) {
                headHtml += '<link type="text/css" rel="stylesheet" href="' + encode(editor.documentBaseURI.toAbsolute(url)) + '">';
              });
  
              var bodyId = settings.body_id || 'tinymce';
              if (bodyId.indexOf('=') != -1) {
                bodyId = editor.getParam('body_id', '', 'hash');
                bodyId = bodyId[editor.id] || bodyId;
              }
  
              var bodyClass = settings.body_class || '';
              if (bodyClass.indexOf('=') != -1) {
                bodyClass = editor.getParam('body_class', '', 'hash');
                bodyClass = bodyClass[editor.id] || '';
              }
  
              var preventClicksOnLinksScript = (
                '<script>' +
                'document.addEventListener && document.addEventListener("click", function(e) {' +
                'for (var elm = e.target; elm; elm = elm.parentNode) {' +
                'if (elm.nodeName === "A") {' +
                'e.preventDefault();' +
                '}' +
                '}' +
                '}, false);' +
                '</script> '
              );
  
              var dirAttr = editor.settings.directionality ? ' dir="' + editor.settings.directionality + '"' : '';
  
              previewHtml = (
                '<!DOCTYPE html>' +
                '<html>' +
                '<head>' +
                headHtml +
                '</head>' +
                '<body id="' + encode(bodyId) + '" class="mce-content-body ' + encode(bodyClass) + '"' + encode(dirAttr) + '>' +
                editor.getContent() +
                preventClicksOnLinksScript +
                '</body>' +
                '</html>'
              );
  
              if (!sandbox) {
                // IE 6-11 doesn't support data uris on iframes
                // so I guess they will have to be less secure since we can't sandbox on those
                // TODO: Use sandbox if future versions of IE supports iframes with data: uris.
                var doc = this.getEl('body').firstChild.contentWindow.document;
                doc.open();
                doc.write(previewHtml);
                doc.close();
              } else {
                this.getEl('body').firstChild.src = 'data:text/html;charset=utf-8,' + encodeURIComponent(previewHtml);
              }
            }
          });
        });
  
        editor.addButton('preview', {
          title: 'Preview',
          cmd: 'mcePreview'
        });
  
        editor.addMenuItem('preview', {
          text: 'Preview',
          cmd: 'mcePreview',
          context: 'view'
        });
      });
  
      return function () { };
    }
  );