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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* pdf data format writer
*
* @package dataformat_pdf
* @copyright 2019 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace dataformat_pdf;
defined('MOODLE_INTERNAL') || die();
/**
* pdf data format writer
*
* @package dataformat_pdf
* @copyright 2019 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class writer extends \core\dataformat\base {
public $mimetype = "application/pdf";
public $extension = ".pdf";
/**
* @var \pdf The pdf object that is used to generate the pdf file.
*/
protected $pdf;
/**
* @var float Each column's width in the current sheet.
*/
protected $colwidth;
/**
* @var string[] Title of columns in the current sheet.
*/
protected $columns;
/**
* writer constructor.
*/
public function __construct() {
global $CFG;
require_once($CFG->libdir . '/pdflib.php');
$this->pdf = new \pdf();
$this->pdf->setPrintHeader(false);
$this->pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
// Set background color for headings.
$this->pdf->SetFillColor(238, 238, 238);
}
public function send_http_headers() {
}
/**
* Start output to file, note that the actual writing of the file is done in {@see close_output_to_file()}
*/
public function start_output_to_file(): void {
$this->start_output();
}
public function start_output() {
$this->pdf->AddPage('L');
}
public function start_sheet($columns) {
$margins = $this->pdf->getMargins();
$pagewidth = $this->pdf->getPageWidth() - $margins['left'] - $margins['right'];
$this->colwidth = $pagewidth / count($columns);
$this->columns = $columns;
$this->print_heading();
}
/**
* Method to define whether the dataformat supports export of HTML
*
* @return bool
*/
public function supports_html(): bool {
return true;
}
/**
* When exporting images, we need to return their Base64 encoded content. Otherwise TCPDF will create a HTTP
* request for them, which will lead to the login page (i.e. not the image it expects) and throw an exception
*
* Note: ideally we would copy the file to a temp location and return it's path, but a bug in TCPDF currently
* prevents that
*
* @param \stored_file $file
* @return string|null
*/
protected function export_html_image_source(\stored_file $file): ?string {
// Set upper dimensions for embedded images.
$resizedimage = $file->resize_image(400, 300);
return '@' . base64_encode($resizedimage);
}
/**
* Write a single record
*
* @param array $record
* @param int $rownum
*/
public function write_record($record, $rownum) {
$rowheight = 0;
$record = $this->format_record($record);
foreach ($record as $cell) {
// We need to calculate the row height (accounting for any content). Unfortunately TCPDF doesn't provide an easy
// method to do that, so we create a second PDF inside a transaction, add cell content and use the largest cell by
// height. Solution similar to that at https://stackoverflow.com/a/1943096.
$pdf2 = clone $this->pdf;
$pdf2->startTransaction();
$pdf2->AddPage('L');
$pdf2->writeHTMLCell($this->colwidth, 0, '', '', $cell, 1, 1, false, true, 'L');
$rowheight = max($rowheight, $pdf2->getY() - $pdf2->getMargins()['top']);
$pdf2->rollbackTransaction();
}
$margins = $this->pdf->getMargins();
if ($this->pdf->GetY() + $rowheight + $margins['bottom'] > $this->pdf->getPageHeight()) {
$this->pdf->AddPage('L');
$this->print_heading();
}
// Get the last key for this record.
end($record);
$lastkey = key($record);
// Reset the record pointer.
reset($record);
// Loop through each element.
foreach ($record as $key => $cell) {
// Determine whether we're at the last element of the record.
$nextposition = ($lastkey === $key) ? 1 : 0;
// Write the element.
$this->pdf->writeHTMLCell($this->colwidth, $rowheight, '', '', $cell, 1, $nextposition, false, true, 'L');
}
}
public function close_output() {
$filename = $this->filename . $this->get_extension();
$this->pdf->Output($filename, 'D');
}
/**
* Write data to disk
*
* @return bool
*/
public function close_output_to_file(): bool {
$this->pdf->Output($this->filepath, 'F');
return true;
}
/**
* Prints the heading row.
*/
private function print_heading() {
$fontfamily = $this->pdf->getFontFamily();
$fontstyle = $this->pdf->getFontStyle();
$this->pdf->SetFont($fontfamily, 'B');
$rowheight = 0;
foreach ($this->columns as $columns) {
$rowheight = max($rowheight, $this->pdf->getStringHeight($this->colwidth, $columns, false, true, '', 1));
}
$total = count($this->columns);
$counter = 1;
foreach ($this->columns as $columns) {
$nextposition = ($counter == $total) ? 1 : 0;
$this->pdf->Multicell($this->colwidth, $rowheight, $columns, 1, 'C', true, $nextposition);
$counter++;
}
$this->pdf->SetFont($fontfamily, $fontstyle);
}
}