Make shutdown work

qutebrowser/browser/tab.py

@@ -116,6 +116,7 @@ class AbstractTab(QWidget):
     url_text_changed = pyqtSignal(str)
     title_changed = pyqtSignal(str)
     load_status_changed = pyqtSignal(str)
+    shutting_down = pyqtSignal()
 
     def __init__(self, parent=None):
         self.tab_id = next(tab_id_gen)
@@ -158,6 +159,9 @@ class AbstractTab(QWidget):
         """
         raise NotImplementedError
 
+    def shutdown(self):
+        raise NotImplementedError
+
     def __repr__(self):
         url = utils.elide(self.cur_url.toDisplayString(QUrl.EncodeUnicode),
                           100)

qutebrowser/browser/webengine/webenginetab.py

@@ -89,6 +89,10 @@ class WebEngineViewTab(tab.AbstractTab):
         else:
             self._widget.page().toHtml(callback)
 
+    def shutdown(self):
+        # TODO
+        pass
+
     def _connect_signals(self):
         view = self._widget
         page = view.page()

qutebrowser/browser/webkit/webkittab.py

@@ -96,6 +96,9 @@ class WebViewTab(tab.AbstractTab):
         else:
             callback(frame.toHtml())
 
+    def shutdown(self):
+        self._widget.shutdown()
+
     def _connect_signals(self):
         view = self._widget
         page = view.page()
@@ -108,6 +111,7 @@ class WebViewTab(tab.AbstractTab):
         view.titleChanged.connect(self.title_changed)
         view.url_text_changed.connect(self.url_text_changed)
         view.load_status_changed.connect(self.load_status_changed)
+        view.shutting_down.connect(self.shutting_down)
 
         # Make sure we emit an appropriate status when loading finished.
         # While Qt has a bool "ok" attribute for loadFinished, it always is True