UsersMultiselectWidget.php

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<?php

namespace MediaWiki\Widget;

use OOUI\MultilineTextInputWidget;

class UsersMultiselectWidget extends \OOUI\Widget {

    protected $usersArray = [];
    protected $inputName = null;
    protected $inputPlaceholder = null;

    public function __construct( array $config = [] ) {
        parent::__construct( $config );

        // Properties
        if ( isset( $config['default'] ) ) {
            $this->usersArray = $config['default'];
        }
        if ( isset( $config['name'] ) ) {
            $this->inputName = $config['name'];
        }
        if ( isset( $config['placeholder'] ) ) {
            $this->inputPlaceholder = $config['placeholder'];
        }

        $textarea = new MultilineTextInputWidget( [
            'name' => $this->inputName,
            'value' => implode( "\n", $this->usersArray ),
            'rows' => 10,
        ] );
        $this->prependContent( $textarea );
    }

    protected function getJavaScriptClassName() {
        return 'mw.widgets.UsersMultiselectWidget';
    }

    public function getConfig( &$config ) {
        if ( $this->usersArray !== null ) {
            $config['selected'] = $this->usersArray;
        }
        if ( $this->inputName !== null ) {
            $config['name'] = $this->inputName;
        }
        if ( $this->inputPlaceholder !== null ) {
            $config['placeholder'] = $this->inputPlaceholder;
        }

        $config['$overlay'] = true;
        return parent::getConfig( $config );
    }

}