Hi all.
I'm a newbie to Qt (but not to Python), and I wanted to ask for "next
step" guidance.
I want to generate PDF reports by pointing a HTML-to-PDF renderer at a
server that spits out well-formed XHTML with inline SVG. I know that
that's a can of worms right there, but I've managed to get a simple
server up and running using the combination of CherryPy + Genshi +
PyChart, and firefox renders it, so that seemed promising.
I know about the "flying saucer" renderer (aka "xhtmlrenderer"), but
that's Java and even though I did manage to use it under Jython) I'd
prefer something more "natively python" (not that Qt is natively
Python, but you get my drift). I have also seen wkhtmltopdf, but it
seems that 60% of the source code was ifdef'd in conjunction with a
heavily patched QtWebKit, so it wasn't very easy to follow through the
flow of source to work out how it worked.
After a couple of hours of hacking I came up with the attached
(pointing to a public website, not an internal server, of course).
This kind of works, but renders the top-left hand corner of the
website onto the page, and I can't for the life of me see any hooks
for controlling pagination. I'm expecting some kind of "progress
callback" interface, a bit like the loadProgress(int) signal, that
gets called every time it starts to render a div above which nothing
else will be rendered.
Or something like that; sorry it's a bit vague, because I don't know
the capabilities of QtWebKit. It's possible that it knows all about
CSS print media and will just do the right thing :-)
Anyway, I've attached my efforts, and I'd greatly appreciate any
guidance or prodding in the right direction.
Cheers,
D
import sys
from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4.QtCore import QObject
from PyQt4.QtCore import QUrl
from PyQt4.QtCore import SIGNAL
from PyQt4.QtGui import QPainter
from PyQt4.QtGui import QPrinter
from PyQt4.QtGui import QImage
from PyQt4 import QtWebKit
class WebKitPDF ( QObject ):
def __init__ ( self, url ):
QObject.__init__ ( self )
self.page = QtWebKit.QWebPage ( self )
self.mainFrame = self.page.mainFrame()
self.mainFrame.load ( QUrl ( url ) )
self.connect ( self.page,
SIGNAL ( "loadProgress(int)" ),
self.loadProgress )
self.connect ( self.page,
SIGNAL ( "loadFinished(bool)" ),
self.renderPDF )
def loadProgress ( self, progress ):
print "Progress: ", progress
def renderPDF ( self, status ):
print "Load finished with status: ", status
print "Rendering PDF ..."
contentsSize = self.mainFrame.contentsSize();
self.page.setViewportSize ( contentsSize )
self.printer = QPrinter ( QPrinter.PrinterResolution )
self.printer.setOutputFormat ( QPrinter.PdfFormat )
self.printer.setPaperSize ( QPrinter.A4 )
self.printer.setOrientation ( QPrinter.Portrait )
self.printer.setOutputFileName ( "wk.pdf" )
self.painter = QPainter ( self.printer )
self.painter.setRenderHint ( QPainter.Antialiasing )
self.mainFrame.render ( self.painter )
self.painter.end()
app = QtGui.QApplication.instance()
app.exit ( 0 )
def main():
app = QtGui.QApplication ( sys.argv )
wk = WebKitPDF ( "http://news.bbc.co.uk"; )
sys.exit ( app.exec_() )
if __name__ == "__main__":
main()
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