* Fires a FILE_CONTENT_READY_EVENT, thus causing the given content * to be displayed in the right pane. * @method * @private * @pa

* Checks whether given file's extension matches one of the * extensions in the list. * @method * @private * @param file { File }

* Checks whether a given item currently presents a 'progress * indicator' instead of its actual content. * @method * @private * @

* Custom initialization for the class UIBuilder. * @method * @private

* Checks whether the given 'file' is to be hidden according to config * regulations. * @method * @private * @param fileUrl { String }

* Checks whether the given file is of a <text> type. * @method * @private * @param file { File } * The file object to check.