PyQT: QWebView with custom QNetworkAccessManager

[Gelonida]

On 02/02/2011 12:31 AM, Gelonida wrote:
> Hi,
> 
> I would like to subclass QNetworkAccessManager and
> create a subclass of QWebView, that will use the subclassed
> QNetworkAccessManager for all accesses.
> 
> Is this possible?
> I have really no idea when and how I could achieve this.
> 
> Thanks in advance for any suggestions / pointers
> 


Well I answer my own question.

In fact my first experiments failed horribly due to a tiny PyQt detail.

I expected that, the variable new_manager does not have to be persistent.

I naively assumed, that a call to setNetworkAccessManager() would keep a
reference to new_manager and thus avoid its destruction this does not
seem to be the case.

Below an example of how to create a QQWebview with a custom
NetworkAccessManager

import sys
import PyQt4.QtGui as QtGui
import PyQt4.QtCore as QtCore
import PyQt4.QtWebKit as QtWebKit
from PyQt4.QtNetwork import QNetworkAccessManager

class MyNetworkAccessManager(QNetworkAccessManager):
    def __init__(self, old_manager):
        QNetworkAccessManager.__init__(self)
        self.setCache(old_manager.cache())
        self.setCookieJar(old_manager.cookieJar())
        self.setProxy(old_manager.proxy())
        self.setProxyFactory(old_manager.proxyFactory())

    def createRequest(self, operation, request, data):
        print "mymanager handles ", request.url()
        return QNetworkAccessManager.createRequest(
                self, operation, request, data)


def set_new_manager(web):
    global new_manager # if this line is commented I will se
    old_manager = web.page().networkAccessManager()
    new_manager = MyNetworkAccessManager(old_manager)
    web.page().setNetworkAccessManager(new_manager)

app = QtGui.QApplication(sys.argv)
web = QtWebKit.QWebView()
set_new_manager()
web.setUrl( QtCore.QUrl("http://www.google.com") )
web.show()

sys.exit(app.exec_())