UnwatchAction.php

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<?php
class UnwatchAction extends WatchAction {

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

    protected function getDescription() {
        return $this->msg( 'removewatch' )->escaped();
    }

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

        return true;
    }

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

    protected function preText() {
        return $this->msg( 'confirm-unwatch-top' )->parse();
    }

    public function onSuccess() {
        $this->getOutput()->addWikiMsg( 'removedwatchtext', $this->getTitle()->getPrefixedText() );
    }
}