help with printing

danoni

so first ill start off and say im fairly new to QT or pyside6 in general. this is my class

class Viewer(QPdfView):
    def __init__(self, parent: QWidget | None = None):
        super().__init__(parent)
        self.setPageMode(QPdfView.PageMode.MultiPage)
        self.setVisible(False)

    def print_(self):
        printer = QPrinter(QPrinter.PrinterMode.HighResolution)
        dialog = QPrintPreviewDialog(printer, self.parent())
        dialog.paintRequested.connect(self.draw)
        dialog.exec()

    def draw(self, printer: QPrinter):
        painter = QPainter(printer)
        painter.setRenderHints(
            QPainter.RenderHint.Antialiasing | QPainter.RenderHint.TextAntialiasing |
            QPainter.RenderHint.SmoothPixmapTransform | QPainter.RenderHint.LosslessImageRendering,
            True
        )
        document = self.document()
        options = QPdfDocumentRenderOptions()
        options.setRenderFlags(
            QPdfDocumentRenderOptions.RenderFlag.ImageAliased |
            QPdfDocumentRenderOptions.RenderFlag.TextAliased |
            QPdfDocumentRenderOptions.RenderFlag.ForceHalftone
        )

        print_range = printer.pageRanges()
        rng = print_range.toString().split("-")
        rng = [i.strip() for i in rng if i.strip().isdigit()]
        if len(rng) == 2:
            range_ = range(int(rng[0]) - 1, int(rng[1]))
        elif len(rng) == 1:
            range_ = tuple([int(rng[0]) - 1])
        else:
            range_ = range(document.pageCount())
        if max(range_) > document.pageCount():
            range_ = range(document.pageCount())
        layout = printer.pageLayout()
        if layout.orientation() == QPageLayout.Orientation.Landscape:
            printer.setPageOrientation(QPageLayout.Orientation.Landscape)
        if layout.pageSize().isValid():
            printer.setPageSize(layout.pageSize())
        for i in range_:
            if i > 0:
                printer.newPage()
            printer.setPageMargins(layout.margins())
            target_rect = printer.pageRect(QPrinter.DevicePixel)
            image_size = QSize(int(target_rect.width()), int(target_rect.height()))
            image = document.render(i, image_size, options)
            if not image.isNull():
                painter.drawImage(target_rect, image)
        painter.end()

Right now the current solution is working very slow as i render each page to an image and then render it to the printer, which takes forever, i thought maybe i can somehow render the QPdfView it self to the printer but couldnt figure out how.

i feel like i dont need to render each page to an image as the QPdfView it self does not do that, it loads it much faster and not as images (text is searchable etc)

also another 2 things id appricate help with

how to render and print from QWebEngineView
the preview it self is very blurry until i zoom in

any help will be greatly appricated!

danoni

By the preview I mean the QPrintPreviewWidget