class.ilDclExportGUI.php

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<?php

class ilDclExportGUI extends ilExportGUI
{
    protected function buildExportTableGUI(): ilExportTableGUI
    {
        $table = new ilDclExportTableGUI($this, 'listExportFiles', $this->obj);

        return $table;
    }

    public function createExportFile(): void
    {
        $format = "";
        if ($this->http->wrapper()->post()->has('format')) {
            $format = $this->http->wrapper()->post()->retrieve('format', $this->refinery->kindlyTo()->string());
        }
        if ($format === 'xlsx') {
            $this->checkForExportableFields();
        }

        parent::createExportFile();
    }

    protected function checkForExportableFields(): bool
    {
        foreach ($this->obj->getTables() as $tbl) {
            foreach ($tbl->getFields() as $field) {
                if ($field->getExportable()) {
                    return true;
                }
            }
        }

        $this->tpl->setOnScreenMessage('failure', $this->lng->txt('dcl_no_export_data_available'), true);
        $this->ctrl->redirect($this, "listExportFiles");

        return false;
    }
}