[PyQt] Printing a widget

[Jason H]

Are you accounting for the higher DPI of printers (300, 600) vs that of the screen (72 or 90)? You'll need to scale accordingly.



----- Original Message ----
From: Robert J. Hansen <rjh at sixdemonbag.org>
To: pyqt at riverbankcomputing.com
Sent: Thursday, July 30, 2009 1:58:59 PM
Subject: [PyQt] Printing a widget

For a piece of code I'm working on, I need the ability to render a QWidget to the printer directly.  The logic goes something like this:

def printout(self):
    widget = self.tab_widget.currentWidget()
    if widget == None:
        # The 'print' button should've been disabled;
        # do so now.
        self.update_ui()
        return
    try:
        widget.printout()
    except:
        painter = QPainter(self.get_printer())
        rectangle = painter.viewport()
        size = widget.size()
        size.scale(rectangle.size(), Qt.KeepAspectRatio)
        painter.setViewport(rectangle.x(), rectangle.y(),
            size.width(), size.height())
        widget.render(painter)

... Unfortunately, this code does not seem to work.  Something gets printed, but it's such a tiny postage stamp that it's not usable for my purposes.  For my tests the widget has been a QLabel; the 'except' block is executed.

What I'm looking for is some way to print such that the widget's width spans the width of the page, and its length will be split up among multiple pages if necessary.  If anyone can give me the magic invocation that will do this, or can direct me to the proper part of the PyQt documentation that tells how to do this, I would be deeply appreciative.  Thank you!



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