FIX: be forgiving about the event for enterEvent not having a pos

tacaswell · tacaswell · commit 5d3bb7820c60 · 2018-07-10T16:29:44.000-05:00
closes #11607 The event object passed in from PyQt4 does not have a `pos` attribute. Be forgiving of this and fallback to None. This matches the fallback behavior in backend_bases if xy is not passed to `enter_notify_event`.
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -291,7 +291,11 @@ def get_width_height(self):
         return int(w / self._dpi_ratio), int(h / self._dpi_ratio)
 
     def enterEvent(self, event):
-        x, y = self.mouseEventCoords(event.pos())
+        try:
+            x, y = self.mouseEventCoords(event.pos())
+        except AttributeError:
+            # the event from PyQt4 does not include the position
+            x = y = None
         FigureCanvasBase.enter_notify_event(self, guiEvent=event, xy=(x, y))
 
     def leaveEvent(self, event):
