Not able to render a tableview to pdf.

[sachinrd]

hello,
I am a newbie in qt, and i was trying to render a table view to a pdf using printers. Below is the reduced version of the code and i am not able to achieve it. can someone help me with this. Thanks for any help in advance.

    ui->setupUi(this);

    QStandardItemModel *indexPageModel=new QStandardItemModel;
    QTableView *indexPageTableView=new QTableView();
    indexPageTableView->setModel(indexPageModel);
    indexPageTableView->verticalHeader()->setVisible(false);
    indexPageTableView->horizontalHeader()->setVisible(false);
//populate tableview
//row1
    QStandardItem *item00 = new QStandardItem("   Title  ");
    item00->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 0, item00);

    QStandardItem *item01 = new QStandardItem("  X-axis  ");
    item01->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 1, item01);

    QStandardItem *item02 = new QStandardItem("  Y-axis  ");
    item02->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 2, item02);

    QStandardItem *item03 = new QStandardItem("    Page#    ");
    item03->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 3, item03);

    QStandardItem *item04 = new QStandardItem("    Trend#    ");
    item04->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 4, item04);

    QStandardItem *item05 = new QStandardItem("Trend Relationship");
    item05->setTextAlignment(Qt::AlignCenter);
    indexPageModel->setItem(0, 5, item05);

    indexPageTableView->resizeColumnsToContents();

    QGraphicsScene *scene=new QGraphicsScene(this);
    QGraphicsProxyWidget *proxy = scene->addWidget(indexPageTableView);
    ui->graphicsView->setScene(scene);
    ui->graphicsView->setAlignment(Qt::AlignTop | Qt::AlignLeft);


    int width = (indexPageModel->columnCount() - 1) + indexPageTableView->verticalHeader()->width();
         for (int column = 0; column < indexPageModel->columnCount(); column++)
             width = width + indexPageTableView->columnWidth(column);
   indexPageTableView->setMinimumWidth(width);
//tableview populated

//render tablview to a pdf
   QFileDialog dialog(this);
   dialog.setDefaultSuffix("pdf");
   QString pdffileName = dialog.getSaveFileName(this, tr("Save File"),
                                              "doc.pdf",
                                              tr("file(.pdf)"));

   QPixmap pixIndexPage(indexPageTableView->size());
   pixIndexPage.fill(Qt::transparent);
   QPainter painterIndexPage(&pixIndexPage);
   painterIndexPage.setRenderHints(QPainter::LosslessImageRendering,QPainter::HighQualityAntialiasing);
   indexPageTableView->render(&painterIndexPage);

   QPrinter printer;
   printer.setOutputFileName(pdffileName);
   printer.setFullPage(true);
   printer.setPageSize(QPageSize(QPageSize::A4));
   printer.newPage();
   QPainter painter( &printer);

   const QRectF textRect(0, 0, printer.pageRect().width() ,printer.pageRect().height() );
   painter.setClipRect(textRect);
   painter.drawPixmap(textRect,pixIndexPage,QRect(0,0,pixIndexPage.size().width(),pixIndexPage.size().height()));```

[mrjj]

@sachinrd
That is really .. not so pretty :)
can you try this ?

void MainWindow::PrintWidget(QWidget* widget) {

  QPixmap pix(widget->size());
  QPainter painter(&pix);
  widget->render(&painter);
  painter.end();
  QPrinter printer(QPrinter::HighResolution);
  printer.setPageOrientation(QPageLayout::Orientation::Landscape);
  printer.setOutputFormat(QPrinter::PdfFormat);
  printer.setPaperSize(QPrinter::A4);
  printer.setOutputFileName("test.pdf"); // will be in build folder

  painter.begin(&printer);  
  double xscale = printer.pageRect().width() / double(pix.width());
  double yscale = printer.pageRect().height() / double(pix.height());
  double scale = qMin(xscale, yscale);
  painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
                    printer.paperRect().y() + printer.pageRect().height() / 2);
  painter.scale(scale, scale);
  painter.translate(-widget->width() / 2, -widget->height() / 2);
  painter.drawPixmap(0, 0, pix);

  painter.end();
}

PrintWidget(ui->tableView);

and see if that looks better ?

[VRonin]

Managing paging manually is painful, you can use QTextDocument to do it for you:

QFileDialog dialog(this);
dialog.setDefaultSuffix("pdf");
const QString pdffileName = dialog.getSaveFileName(this, tr("Save File"), tr("doc.pdf"), tr("file(.pdf)"));
if(pdffileName.isEmpty())
    return;
QTextDocument doc;
QTextCursor cursor(doc);
const int rowC = indexPageModel->rowCount();
const int colC = indexPageModel->columnCount();
cursor.insertTable(rowC ,colC);
for(int i=0;i<rowC ;++i){
    for(int j=0;j<colC ;++j){
        cursor.insertText(indexPageModel->index(i,j).data().toString());
        cursor.movePosition(QTextCursor::NextCell);
    }
}
QPrinter printer;
printer.setOutputFileName(pdffileName);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setPageSize(QPageSize(QPageSize::A4));
doc.print(&printer);

P.S.
I think you are leaking the model. change it to QStandardItemModel *indexPageModel=new QStandardItemModel(this);

[JonB]

@sachinrd
@VRonin's suggestion of going via QTextDocument is much easier/more robust. But be aware this will produce a table in PDF with the textual content from the model; it will not necessarily look like what you see in the QTableView (e.g. column widths, coloring, style, etc.). So long as that is acceptable to you.

[artwaw]

@sachinrd Hi,
I'd also advise you to switch to QPdfWriter if your intention is to only write PDF files. Makes life easier.

[sachinrd]

@VRonin said in Not able to render a tableview to pdf.:

QFileDialog dialog(this);
dialog.setDefaultSuffix("pdf");
const QString pdffileName = dialog.getSaveFileName(this, tr("Save File"), tr("doc.pdf"), tr("file(.pdf)"));
if(pdffileName.isEmpty())
return;
QTextDocument doc;
QTextCursor cursor(doc);
const int rowC = indexPageModel->rowCount();
const int colC = indexPageModel->columnCount();
cursor.insertTable(rowC ,colC);
for(int i=0;i<rowC ;++i){
for(int j=0;j<colC ;++j){
cursor.insertText(indexPageModel->index(i,j).data().toString());
cursor.movePosition(QTextCursor::NextCell);
}
}
QPrinter printer;
printer.setOutputFileName(pdffileName);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setPageSize(QPageSize(QPageSize::A4));
doc.print(&printer);

Thanks for the reply @VRonin . I tried this solution.. But i want to add a header and footer to the page.. Finding it tough to add it with this approach. And i also have one column with a checkbox widget. rendering that with this approach would be tough right..

[sachinrd]

@JonB yes, i do want to render it as it looks in the QTableView. Is there an easy way to do this. I am able to render it to a pixmap and then paint it to printer object using a painter.
Something like this:
painter->drawPixmap(textRect,pix,QRect(0,0,pix.size().width(),pix.size().height()));
But The content is appearing a bit bigger .

[mrjj]

@sachinrd
That is really .. not so pretty :)
can you try this ?

void MainWindow::PrintWidget(QWidget* widget) {

  QPixmap pix(widget->size());
  QPainter painter(&pix);
  widget->render(&painter);
  painter.end();
  QPrinter printer(QPrinter::HighResolution);
  printer.setPageOrientation(QPageLayout::Orientation::Landscape);
  printer.setOutputFormat(QPrinter::PdfFormat);
  printer.setPaperSize(QPrinter::A4);
  printer.setOutputFileName("test.pdf"); // will be in build folder

  painter.begin(&printer);  
  double xscale = printer.pageRect().width() / double(pix.width());
  double yscale = printer.pageRect().height() / double(pix.height());
  double scale = qMin(xscale, yscale);
  painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
                    printer.paperRect().y() + printer.pageRect().height() / 2);
  painter.scale(scale, scale);
  painter.translate(-widget->width() / 2, -widget->height() / 2);
  painter.drawPixmap(0, 0, pix);

  painter.end();
}

PrintWidget(ui->tableView);

and see if that looks better ?

[sachinrd]

@mrjj said in Not able to render a tableview to pdf.:

PrintWidget(ui->tableView);

Thanks for the reply @mrjj . This is working perfect for me. Thanks a lot for the help !!

[mrjj]

@sachinrd
You are welcome.
Do notice this way of printing it only works when it
can fit on one page. if it has many rows, it will not be optimal :)