Re: [PyQt] A Hopefully Silly Question from a Beginner

[Patrick Barrett]

On 09/16/2013 10:58 AM, Ryan Hanson wrote:
On Mon, Sep 16, 2013 at 10:19 AM, Patrick Barrett <patr...@mkii.org 
<mailto:patr...@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:akyqhkd...@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
_______________________________________________
PyQt mailing list    PyQt@riverbankcomputing.com
http://www.riverbankcomputing.com/mailman/listinfo/pyqt