WebInstallerPage.php

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<?php
abstract class WebInstallerPage {

    public $parent;

    abstract public function execute();

    public function __construct( WebInstaller $parent ) {
        $this->parent = $parent;
    }

    public function isSlow() {
        return false;
    }

    public function addHTML( $html ) {
        $this->parent->output->addHTML( $html );
    }

    public function startForm() {
        $this->addHTML(
            "<div class=\"config-section\">\n" .
            Html::openElement(
                'form',
                [
                    'method' => 'post',
                    'action' => $this->parent->getUrl( [ 'page' => $this->getName() ] )
                ]
            ) . "\n"
        );
    }

    public function endForm( $continue = 'continue', $back = 'back' ) {
        $s = "<div class=\"config-submit\">\n";
        $id = $this->getId();

        if ( $id === false ) {
            $s .= Html::hidden( 'lastPage', $this->parent->request->getVal( 'lastPage' ) );
        }

        if ( $continue ) {
            // Fake submit button for enter keypress (T28267)
            // Messages: config-continue, config-restart, config-regenerate
            $s .= Xml::submitButton(
                wfMessage( "config-$continue" )->text(),
                [
                    'name' => "enter-$continue",
                    'style' => 'width:0;border:0;height:0;padding:0'
                ]
            ) . "\n";
        }

        if ( $back ) {
            // Message: config-back
            $s .= Xml::submitButton(
                wfMessage( "config-$back" )->text(),
                [
                    'name' => "submit-$back",
                    'tabindex' => $this->parent->nextTabIndex()
                ]
            ) . "\n";
        }

        if ( $continue ) {
            // Messages: config-continue, config-restart, config-regenerate
            $s .= Xml::submitButton(
                wfMessage( "config-$continue" )->text(),
                [
                    'name' => "submit-$continue",
                    'tabindex' => $this->parent->nextTabIndex(),
                ]
            ) . "\n";
        }

        $s .= "</div></form></div>\n";
        $this->addHTML( $s );
    }

    public function getName() {
        return str_replace( 'WebInstaller', '', static::class );
    }

    protected function getId() {
        return array_search( $this->getName(), $this->parent->pageSequence );
    }

    public function getVar( $var, $default = null ) {
        return $this->parent->getVar( $var, $default );
    }

    public function setVar( $name, $value ) {
        $this->parent->setVar( $name, $value );
    }

    protected function getFieldsetStart( $legend ) {
        return "\n<fieldset><legend>" . wfMessage( $legend )->escaped() . "</legend>\n";
    }

    protected function getFieldsetEnd() {
        return "</fieldset>\n";
    }

    protected function startLiveBox() {
        $this->addHTML(
            '<div id="config-spinner" style="display:none;">' .
            '<img src="images/ajax-loader.gif" /></div>' .
            '<script>jQuery( "#config-spinner" ).show();</script>' .
            '<div id="config-live-log">' .
            '<textarea name="LiveLog" rows="10" cols="30" readonly="readonly">'
        );
        $this->parent->output->flush();
    }

    protected function endLiveBox() {
        $this->addHTML( '</textarea></div>
<script>jQuery( "#config-spinner" ).hide()</script>' );
        $this->parent->output->flush();
    }

}