mediawiki-extensions-VisualEditor/modules/es/tools/es.ItalicButtonTool.js

es.ItalicButtonTool = function( toolbar ) {
	es.ButtonTool.call( this, toolbar, 'italic' );
};

es.ItalicButtonTool.prototype.updateState = function ( selection, annotations ) {
	for ( var i = 0; i < annotations.length; i++ ) {
		if ( annotations[i].type === 'textStyle/italic' ) {
			this.$.addClass( 'es-toolbarTool-down' );
			return;
		}
	}
	this.$.removeClass( 'es-toolbarTool-down' );
};

es.ToolbarView.tools.italic = es.ItalicButtonTool;

es.extendClass( es.ItalicButtonTool, es.ButtonTool );