HTMLButtonField.php

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<?php

class HTMLButtonField extends HTMLFormField {
    protected $buttonType = 'button';
    protected $buttonLabel = null;

    protected $mFlags = [];

    public function __construct( $info ) {
        $info['nodata'] = true;
        if ( isset( $info['flags'] ) ) {
            $this->mFlags = $info['flags'];
        }

        # Generate the label from a message, if possible
        if ( isset( $info['buttonlabel-message'] ) ) {
            $this->buttonLabel = $this->getMessage( $info['buttonlabel-message'] )->parse();
        } elseif ( isset( $info['buttonlabel'] ) ) {
            if ( $info['buttonlabel'] === '&#160;' ) {
                // Apparently some things set &nbsp directly and in an odd format
                $this->buttonLabel = '&#160;';
            } else {
                $this->buttonLabel = htmlspecialchars( $info['buttonlabel'] );
            }
        } elseif ( isset( $info['buttonlabel-raw'] ) ) {
            $this->buttonLabel = $info['buttonlabel-raw'];
        }

        $this->setShowEmptyLabel( false );

        parent::__construct( $info );
    }

    public function getInputHTML( $value ) {
        $flags = '';
        $prefix = 'mw-htmlform-';
        if ( $this->mParent instanceof VFormHTMLForm ||
            $this->mParent->getConfig()->get( 'UseMediaWikiUIEverywhere' )
        ) {
            $prefix = 'mw-ui-';
            // add mw-ui-button separately, so the descriptor doesn't need to set it
            $flags .= ' ' . $prefix . 'button';
        }
        foreach ( $this->mFlags as $flag ) {
            $flags .= ' ' . $prefix . $flag;
        }
        $attr = [
            'class' => 'mw-htmlform-submit ' . $this->mClass . $flags,
            'id' => $this->mID,
            'type' => $this->buttonType,
            'name' => $this->mName,
            'value' => $this->getDefault(),
        ] + $this->getAttributes( [ 'disabled', 'tabindex' ] );

        if ( $this->isBadIE() ) {
            return Html::element( 'input', $attr );
        } else {
            return Html::rawElement( 'button', $attr,
                $this->buttonLabel ?: htmlspecialchars( $this->getDefault() ) );
        }
    }

    public function getInputOOUI( $value ) {
        return new OOUI\ButtonInputWidget( [
            'name' => $this->mName,
            'value' => $this->getDefault(),
            'label' => !$this->isBadIE() && $this->buttonLabel
                ? new OOUI\HtmlSnippet( $this->buttonLabel )
                : $this->getDefault(),
            'type' => $this->buttonType,
            'classes' => [ 'mw-htmlform-submit', $this->mClass ],
            'id' => $this->mID,
            'flags' => $this->mFlags,
            'useInputTag' => $this->isBadIE(),
        ] + OOUI\Element::configFromHtmlAttributes(
            $this->getAttributes( [ 'disabled', 'tabindex' ] )
        ) );
    }

    protected function needsLabel() {
        return false;
    }

    public function validate( $value, $alldata ) {
        return true;
    }

    private function isBadIE() {
        $request = $this->mParent
            ? $this->mParent->getRequest()
            : RequestContext::getMain()->getRequest();
        return preg_match( '/MSIE [1-7]\./i', $request->getHeader( 'User-Agent' ) );
    }
}