ve.ui.MWSurface.js
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ve.ui.MWSurface.js
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	/*!
	* VisualEditor UserInterface MWSurface class.
	*
	* @copyright See AUTHORS.txt
	*/

	/**
	* @class
	* @extends ve.ui.Surface
	*
	* @constructor
	* @param {ve.init.Target} target
	* @param {HTMLDocument\|Array\|ve.dm.LinearData\|ve.dm.Document} dataOrDoc Document data to edit
	* @param {Object} [config] Configuration options
	*/
	ve.ui.MWSurface = function VeUiMWSurface() {
	// Parent constructor
	ve.ui.MWSurface.super.apply( this, arguments );

	// Events
	this.getView().getDocument().connect( this, { langChange: 'onDocumentViewLangChange' } );

	// DOM changes
	this.onDocumentViewLangChange();
	this.$element.addClass( 've-ui-mwSurface' );
	// T164790
	this.getView().$attachedRootNode.addClass( 'mw-parser-output mw-show-empty-elt' );
	};

	/* Inheritance */

	OO.inheritClass( ve.ui.MWSurface, ve.ui.Surface );

	/* Methods */

	/**
	* Handle document view langChange events
	*/
	ve.ui.MWSurface.prototype.onDocumentViewLangChange = function () {
	// Add appropriately mw-content-ltr or mw-content-rtl class
	this.getView().$attachedRootNode
	.removeClass( 'mw-content-ltr mw-content-rtl' )
	// The following classes are used here:
	// * mw-content-ltr
	// * mw-content-rtl
	.addClass( 'mw-content-' + this.getView().getDocument().getDir() );
	};