CollapsibleFieldsetLayout.php

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<?php
 
class CollapsibleFieldsetLayout extends OOUI\FieldsetLayout {
    public function __construct( array $config = [] ) {
        parent::__construct( $config );
 
        $this->addClasses( [ 'mw-collapsible' ] );
        if ( isset( $config[ 'collapsed' ] ) && $config[ 'collapsed' ] ) {
            $this->addClasses( [ 'mw-collapsed' ] );
        }
        $this->header->addClasses( [ 'mw-collapsible-toggle' ] );
        $this->group->addClasses( [ 'mw-collapsible-content' ] );
 
        $this->header->appendContent(
            new OOUI\IconWidget( [
                'icon' => 'expand',
                'label' => wfMessage( 'collapsible-expand' )->text(),
            ] ),
            new OOUI\IconWidget( [
                'icon' => 'collapse',
                'label' => wfMessage( 'collapsible-collapse' )->text(),
            ] )
        );
 
        $this->header->setAttributes( [
            'role' => 'button',
        ] );
    }
}