Fix positioning of triangle size slider

Older versions of the PyGI GTK+ bindings crash when emitting the
get-child-position signal to a Python callback, so use halign/valign instead.

1 files changed, 5 insertions, 12 deletions

diff --git a/PascalTriangle.activity/pascaltriangle.py b/PascalTriangle.activity/pascaltriangle.py
index d98ac73..aea55e1 100755
--- a/PascalTriangle.activity/pascaltriangle.py
+++ b/PascalTriangle.activity/pascaltriangle.py
@@ -69,10 +69,8 @@ class PascalTriangleActivity(activity.Activity):
         # adjusted. This is the number of cells on the triangle's base
         # (equivalently, the number of rows in the triangle).
         overlay = Gtk.Overlay()
-        overlay.connect('get-child-position', self._adjustment_get_position_cb,
-                        None)
-        overlay.show()
         overlay.add(drawing_area)
+        overlay.show()
 
         slider = Gtk.VScale()
         slider.props.digits = 0 # integers only
@@ -81,6 +79,10 @@ class PascalTriangleActivity(activity.Activity):
         slider.set_range(2, 10)
         slider.set_increments(1, 2)
         slider.set_value(5) # initial triangle size
+
+        slider.props.halign = Gtk.Align.START
+        slider.props.valign = Gtk.Align.START
+        slider.set_size_request(70, 150)
         slider.show()
         overlay.add_overlay(slider)
 
@@ -412,15 +414,6 @@ class PascalTriangleActivity(activity.Activity):
     show_hints = property(get_show_hints, set_show_hints)
 
 
-    def _adjustment_get_position_cb(self, overlay, child, alloc, data = None):
-        # Hard-code the size and position of the triangle size slider.
-        alloc.x = 10
-        alloc.y = 10
-        alloc.width = 70
-        alloc.height = 150
-
-        return True
-
     def _slider_value_changed_cb(self, widget, data = None):
         new_triangle_size = int(widget.get_value())