PyQt window closes after launch

Question

I\'m trying to use a QPushButton to call a function that opens a new instance of QWebView. Works but as soon as the window opens it closes again. I\'ve read this - PyQt win

Answer 1

Create a MainWindow class that keeps a list of open Browsers, and every time when you open a browser, just add it to the list. And when a browser window closes, it will remove itself from the list, see closeEvent.

import sys
from PyQt4 import QtCore, QtGui, QtWebKit
from PyQt4.QtWebKit import QWebSettings
from PyQt4.QtNetwork import QNetworkAccessManager
from PyQt4.QtNetwork import *


UA_STRING = """Test Test Test""" 
vidurl = ("empty")

class YWebPage(QtWebKit.QWebPage):
    def __init__(self):
        super(YWebPage, self).__init__()

    def userAgentForUrl(self, url):
        return UA_STRING


class Browser(QtGui.QMainWindow): # "Browser" window
    def __init__(self, main, url):
        QtGui.QMainWindow.__init__(self)
        self.main = main
        self.resize(800,600) # Viewport size
        self.webView = QtWebKit.QWebView()
        self.setCentralWidget(self.webView)
        self.yPage = YWebPage()
        self.webView.setPage(self.yPage)
        self.webView.load(QtCore.QUrl(url)) # Video URL
        self.webView.settings().setAttribute(QtWebKit.QWebSettings.PluginsEnabled, True) # Enables flash player

    def closeEvent(self, event):
        self.main.browsers.remove(self)
        super(Browser, self).closeEvent(event)


class MainWindow(QtGui.QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.browsers = []

        self.resize(200, 450)
        self.setFixedSize(200, 350)
        self.move(300, 300)
        self.setWindowTitle('U-bot 0.1')

        # Setup GUI

        # Start Button
        self.__button = QtGui.QPushButton('Start')
        self.__button.clicked.connect(self.open)

        # Text area
        self.__qle = QtGui.QLineEdit()
        self.__qle.setText("http://")

        # Images
        pixmap1 = QtGui.QPixmap("ubot.png")
        lbl1 = QtGui.QLabel()
        lbl1.resize(200, 150)
        lbl1.setPixmap(pixmap1)
        lbl1.setScaledContents(True)

        layout = QtGui.QVBoxLayout()
        layout.addStretch(1)

        layout.addWidget(self.__qle)
        layout.addWidget(self.__button)

        self.setLayout(layout)

    def open(self):
        b = Browser(self, self.__qle.text())
        b.show()
        self.browsers.append(b)


def main():
    app = QtGui.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()