[PyQt] A Hopefully Silly Question from a Beginner

[Ryan Hanson]

On Mon, Sep 16, 2013 at 12:18 PM, Patrick Barrett <patrick at mkii.org> wrote:

>  On 09/16/2013 10:58 AM, Ryan Hanson wrote:
>
> On Mon, Sep 16, 2013 at 10:19 AM, Patrick Barrett <patrick at mkii.org>wrote:
>
>> I'm trying to write a small app the generates a few QWebView windows and
>> then rotates the page that is displayed on a set interval.
>>
>> Code: https://gist.github.com/Azdle/6556433
>>
>> I've run into an issue that I don't understand. When I try to generate a
>> `PageWindow` (Class based on QWebView) from within my `MainWindow` class
>> nothing appears. (See the code in 29-30) However, when I copy and paste
>> that code outside of any classes the window appears as it should. (See the
>> commented code in 56-57)
>>
>> Even when I can make the QWebView window appear, the QTimer object that I
>> create in the `PageWindow` never seems to timeout. I think this is being
>> caused by the same issue as the first problem.
>>
>> I'm not sure if the issues are me doing the python wrong or just not
>> understanding something about how the Qt-specfic aspects work. I have this
>> application already working in C++, but want to get it working in Python.
>>
>> Thanks
>> --Patrick
>>
>>
>  Here you go Patrick, you want to move your timer into your main class
> and then call your new page function on the instance of PageWindow that you
> create inside that class.
>
>  import sys
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
> from PyQt4.QtWebKit import *
>
> pages = [
>       "https://portals.exosite.com/views/3819798770/3579834479",
>       "https://portals.exosite.com/views/2562112089/4128069106",
>       "https://portals.exosite.com/views/2060811893/1760385000",
>       "https://exosite:AKYQhkDqj4@logs.exosite.com:444"
> ]
>
> class MainWindow(QMainWindow):
>
>      def __init__(self, *args):
>         QMainWindow.__init__(self)
>
>         self.quitButton = QPushButton("Quit")
>         vbox = QVBoxLayout()
>         vbox.addWidget(self.quitButton)
>         centralWidget = QWidget()
>         centralWidget.setLayout(vbox)
>         self.setCentralWidget(centralWidget)
>
>         self.quitButton.clicked.connect(self.close)
>
>         self.pageView = PageWindow()
>         self.pageView.show()
>
>         self.pageTimer = QTimer()
>         self.pageTimer.timeout.connect(self.pageView.nextPage)
>         self.pageTimer.start(5000)
>
>     def closeEvent(self, event):
>         self.pageTimer.stop()
>         self.pageView.close()
>         event.accept()
>
> class PageWindow(QWebView):
>      def __init__(self):
>         QWebView.__init__(self)
>
>         self.pageIndex = 0
>         self.nextPage()
>         self.setGeometry(QApplication.desktop().screenGeometry(1))
>         self.showFullScreen()
>
>     def nextPage(self):
>         print("Loading:"+pages[self.pageIndex])
>         self.load(QUrl(pages[self.pageIndex]))
>         self.pageIndex = self.pageIndex + 1
>         if self.pageIndex >= len(pages):
>             self.pageIndex = 0
>
> def main(args):
>     app = QApplication(args)
>     win = MainWindow()
>     win.show()
>     app.connect(app, SIGNAL("lastWindowClosed()"),
>                 app, SLOT("quit()"))
>     app.exec_()
>
> if __name__=="__main__":
>         main(sys.argv)
>
>
> Thanks Ryan. I ended up moving the timer object back into the `PageWindow`
> class.
>
> Added a new revision to the old Gist:
> https://gist.github.com/Azdle/6556433
>
> I see from your code that my issue was that I was putting object in local
> scope instead of putting them in the object (using var instead of self.var,
> my terminology is probably wrong) so the objects were getting garbage
> collected right after getting created.
>
> Thanks for your help!
>
> --Patrick
>

Glad you got it working
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