print preview widget

[rest]

like anyone has an example with how to use print preview widget?
i'm having a main window that has a widget where in paint event i draw some shape, this widget where i draw being in a layout, and i wanna make something like when i trigger and paint action to get the preview like an raport.
i tried something like this, idk i should make another widget? idk understand how they work
void MainWindow::on_actionPrint_triggered()
{
QPrinter *printer = new QPrinter(QPrinter::PrinterResolution);
printer->setOutputFormat(QPrinter::PdfFormat);
printer->setOutputFileName("sample.pdf");
printer->setPaperSize(QPrinter::A4);
printer->setFullPage(true);
printer->setResolution(300);
QPrintPreviewWidget *preview = new QPrintPreviewWidget(printer,ui->drawGraphicView);
preview->print();
}

[mrjj]

@rest said in print preview widget:

QPrintPreviewWidget

Hi
Sample here
https://stackoverflow.com/questions/3827873/how-to-embedded-the-print-preview-dialog-in-qt

key point is paintRequested
connect(preview, SIGNAL(paintRequested(QPrinter*)), report, SLOT(Print(QPrinter*)));

and you then print what you want in Print(..) ( can be named anything)

Note that you can ask a widget to paint somewhere else using the render() method.

[rest]

This post is deleted!

[rest]

@mrjj solved, but the size of the preview i can't change it and is in the same line as the toolbar from where i do the printaction, where could be the problem?

[mrjj]

@rest
Super.
The widgets render in the size they have/are.
If you want it bigger, you could print to image and scale it.
You can maybe even do it directly with render and painter.scale but
i never tested this.

void MainWindow::printshot() {
  QPixmap pix = QPixmap::grabWindow(QApplication::desktop()->winId());
  QPrinter printer(QPrinter::HighResolution);
  printer.setOrientation(QPrinter::Landscape);

  QPainter painter;
  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(-width() / 2, -height() / 2); // note uses the form width/height! use pix.h/w if random image
  painter.drawPixmap(0, 0, pix);
  painter.end();
}

If you need very high fidelity, split your paintEvent into a new function taking a QPainter *
and call it for printing too. That way you can scale to use the full DPI of the printer.

• and is in the same line as the toolbar from where i do the printaction
  I do not understand this line :)

[rest]

@mrjj thank you so much but solved it last night, was just a problem when i was using the constructor for the printpreview

[rest]

@mrjj but question, when i trigger print i should get an sample.pdf saved somewherE?

[mrjj]

@rest
yes if u set the filename and type to pdf
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setOutputFileName(filename);

[rest]

@mrjj , i set all this in an action print preview where i have also preview->print;
preview->show . but i dont get an pdf saved nowhere

[mrjj]

@mrjj said in print preview widget:

printer.setOutputFileName(filename);

you control where with setOutputFileName
make sure to use / and not \ for the full path to the file

[rest]

void MainWindow::on_actionPrint_triggered()
{
QPrinter *printer = new QPrinter(QPrinter::HighResolution);
printer->setOutputFormat(QPrinter::PdfFormat);

printer->setPaperSize(QPrinter::A4);
printer->setOrientation(QPrinter::Landscape);
printer->setFullPage(true);
//printer->setResolution(100);
printer->setOutputFileName("Desktop//aaaa.pdf");

QPrintPreviewWidget *preview =0;
preview = new QPrintPreviewWidget(printer,preview);

preview->print();

connect(preview, SIGNAL(paintRequested(QPrinter*)),allWorkspaceShapes[currentIndex]->drawShape,SLOT(Print(QPrinter*)));

preview->show();

}

i used this and still didn't get anything, i have another problem in the code maybe?

[mrjj]

@rest said in print preview widget:
That is NOT a valid path
setOutputFileName("Desktop//aaaa.pdf");

Please use a valid full path and only single /

like
C:/Users/SOMEUSERNAME/Desktop/test.pdf

[rest]

printer->setOutputFileName("C:/Users/admin/Desktop/test.pdf");
i tried and nothing :(

[mrjj]

@rest

and you do have write access there ?
and the path IS real. meaning u didnt make up the admin name.

[rest]

@mrjj and then i used this and still does not work
printer->setOutputFileName("C:/Users/Public/Public Documents/test.pdf");

[mrjj]

@rest
and it does show stuff in preview ?
but the file is NOT created?

[rest]

exactly, it shows but it's not saved

[mrjj]

@rest
and u press print inside preview ?
to make it actually print and not just preview ?

[rest]

@mrjj solved, i had make the print preview and printer object in the constructor of the window

[mrjj]

@rest
oh, so moving them helped?