ListToggle.php

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<?php
class ListToggle {
    private $output;

    public function __construct( OutputPage $output ) {
        $this->output = $output;

        $output->addModules( 'mediawiki.checkboxtoggle' );
        $output->addModuleStyles( 'mediawiki.checkboxtoggle.styles' );
    }

    private function checkboxLink( $checkboxType ) {
        return Html::element(
            // CSS classes: mw-checkbox-all, mw-checkbox-none, mw-checkbox-invert
            'a', [ 'href' => '#', 'class' => 'mw-checkbox-' . $checkboxType ],
            $this->output->msg( 'checkbox-' . $checkboxType )->text()
        );
    }

    public function getHTML() {
        // Select: All, None, Invert
        $links = [
            $this->checkboxLink( 'all' ),
            $this->checkboxLink( 'none' ),
            $this->checkboxLink( 'invert' ),
        ];

        return Html::rawElement( 'div',
            [
                'class' => 'mw-checkbox-toggle-controls'
            ],
            $this->output->msg( 'checkbox-select' )
                ->rawParams( $this->output->getLanguage()->commaList( $links ) )->escaped()
        );
    }
}