Migrate deprecated PyQt 5.5 to new PyQt 5.10

Migrate from WebKit to WebEngine

gui.py

@@ -1,7 +1,5 @@
 import sys
-import webbrowser
-
-from PyQt5 import QtCore, QtWidgets, QtWebKitWidgets, QtGui
+from PyQt5 import QtCore, QtWidgets, QtGui, QtWebEngineWidgets
 
 
 def init_gui(application, port=5000, width=300, height=400,
@@ -10,37 +8,43 @@ def init_gui(application, port=5000, width=300, height=400,
     ROOT_URL = 'http://localhost:{}'.format(port)
 
     # open links in browser from http://stackoverflow.com/a/3188942/1103397 :D
-    def link_clicked(url):
+    # thanks to https://github.com/marczellm/qhangups/blob/cfed73ee4383caed1568c0183a9906180f01cb00/qhangups/WebEnginePage.py
+    def link_clicked(url, typ, ismainframe):
         ready_url = url.toEncoded().data().decode()
-        if ROOT_URL not in ready_url:
-            webbrowser.open(ready_url)
-        else:
-            window.webView.load(QtCore.QUrl(ready_url))
+        is_clicked = typ == QtWebEngineWidgets.QWebEnginePage.NavigationTypeLinkClicked
+        is_not_internal = ROOT_URL not in ready_url
+        if is_clicked and is_not_internal:
+            QtGui.QDesktopServices.openUrl(url)
+            return False
+        return True
 
     def run_app():
         application.run(port=port, threaded=True)
 
+    # Application Level
     qtapp = QtWidgets.QApplication(sys.argv)
-
     webapp = QtCore.QThread()
     webapp.__del__ = webapp.wait
     webapp.run = run_app
     webapp.start()
-
     qtapp.aboutToQuit.connect(webapp.terminate)
 
+    # Main Window Level
     window = QtWidgets.QMainWindow()
     window.resize(width, height)
     window.setWindowTitle(window_title)
-    window.webView = QtWebKitWidgets.QWebView(window)
-    window.setCentralWidget(window.webView)
     window.setWindowIcon(QtGui.QIcon(icon))
 
-    window.webView.page().setLinkDelegationPolicy(
-        QtWebKitWidgets.QWebPage.DelegateAllLinks)
-    window.webView.page().linkClicked.connect(link_clicked)
+    # WebView Level
+    window.webView = QtWebEngineWidgets.QWebEngineView(window)
+    window.setCentralWidget(window.webView)
+
+    # WebPage Level
+    page = QtWebEngineWidgets.QWebEnginePage()
+    page.acceptNavigationRequest = link_clicked
+    page.load(QtCore.QUrl(ROOT_URL))
+    window.webView.setPage(page)
 
-    window.webView.load(QtCore.QUrl(ROOT_URL))
     window.show()
 
     return qtapp.exec_()