UnwatchAction.php

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<?php
class UnwatchAction extends WatchAction {

    public function getName() {
        return 'unwatch';
    }

    public function onSubmit( $data ) {
        self::doUnwatch( $this->getTitle(), $this->getUser() );

        return true;
    }

    protected function getFormFields() {
        return [
            'intro' => [
                'type' => 'info',
                'vertical-label' => true,
                'raw' => true,
                'default' => $this->msg( 'confirm-unwatch-top' )->parse()
            ]
        ];
    }

    protected function alterForm( HTMLForm $form ) {
        parent::alterForm( $form );
        $form->setWrapperLegendMsg( 'removewatch' );
        $form->setSubmitTextMsg( 'confirm-unwatch-button' );
    }

    public function onSuccess() {
        $msgKey = $this->getTitle()->isTalkPage() ? 'removedwatchtext-talk' : 'removedwatchtext';
        $this->getOutput()->addWikiMsg( $msgKey, $this->getTitle()->getPrefixedText() );
    }

    public function doesWrites() {
        return true;
    }
}