mw.echo.ui.ReadStateButtonSelectWidget.js
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mw.echo.ui.ReadStateButtonSelectWidget.js
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	( function () {
	/**
	* A select widget for notification read state: 'all', 'read' or 'unread'
	*
	* @class
	* @extends OO.ui.ButtonSelectWidget
	*
	* @constructor
	* @param {Object} [config] Configuration object
	*/
	mw.echo.ui.ReadStateButtonSelectWidget = function MwEchoUiReadStateButtonSelectWidget( config ) {
	// Parent constructor
	mw.echo.ui.ReadStateButtonSelectWidget.super.call( this, Object.assign( {}, config, {
	items: [
	new OO.ui.ButtonOptionWidget( {
	data: 'all',
	label: mw.msg( 'notification-inbox-filter-all' )
	} ),
	new OO.ui.ButtonOptionWidget( {
	data: 'read',
	label: mw.msg( 'notification-inbox-filter-read' )
	} ),
	new OO.ui.ButtonOptionWidget( {
	data: 'unread',
	label: mw.msg( 'notification-inbox-filter-unread' )
	} )
	]
	} ) );

	this.connect( this, { choose: 'onChoose' } );

	this.$element
	.addClass( 'mw-echo-ui-readStateButtonSelectWidget' );
	};

	/* Initialization */

	OO.inheritClass( mw.echo.ui.ReadStateButtonSelectWidget, OO.ui.ButtonSelectWidget );

	/* Events */

	/**
	* @event mw.echo.ui.ReadStateButtonSelectWidget#filter
	* @param {string} readState The chosen read state
	*/

	/* Methods */

	/**
	* Respond to choose event
	*
	* @param {OO.ui.ButtonOptionWidget} item Chosen item
	* @fires mw.echo.ui.ReadStateButtonSelectWidget#filter
	*/
	mw.echo.ui.ReadStateButtonSelectWidget.prototype.onChoose = function ( item ) {
	const data = item && item.getData();

	if ( data ) {
	this.emit( 'filter', data );
	}
	};
	}() );