focus the canvas

make the boxes private using the python mangling
algorithm (see pep8)

src/sugar/graphics/window.py

@@ -96,20 +96,20 @@ class Window(gtk.Window):
         self._canvas = None
         self.tray = None
 
-        self._vbox = gtk.VBox()
-        self._hbox = gtk.HBox()
-        self._vbox.pack_start(self._hbox)
-        self._hbox.show()
+        self.__vbox = gtk.VBox()
+        self.__hbox = gtk.HBox()
+        self.__vbox.pack_start(self.__hbox)
+        self.__hbox.show()
 
         self._event_box = gtk.EventBox()
-        self._hbox.pack_start(self._event_box)
+        self.__hbox.pack_start(self._event_box)
         self._event_box.show()
         self._event_box.add_events(gtk.gdk.POINTER_MOTION_HINT_MASK
                                    | gtk.gdk.POINTER_MOTION_MASK)
         self._event_box.connect('motion-notify-event', self.__motion_notify_cb)
 
-        self.add(self._vbox)
-        self._vbox.show()
+        self.add(self.__vbox)
+        self.__vbox.show()
 
         self._is_fullscreen = False
         self._unfullscreen_button = UnfullscreenButton()
@@ -126,6 +126,7 @@ class Window(gtk.Window):
             self._event_box.add(canvas)
 
         self._canvas = canvas
+        self.__vbox.set_focus_child(self._canvas)
 
     def get_canvas(self):
         return self._canvas
@@ -137,10 +138,10 @@ class Window(gtk.Window):
 
     def set_toolbar_box(self, toolbar_box):
         if self._toolbar_box:
-            self._vbox.remove(self._toolbar_box)
+            self.__vbox.remove(self._toolbar_box)
 
-        self._vbox.pack_start(toolbar_box, False)
-        self._vbox.reorder_child(toolbar_box, 0)
+        self.__vbox.pack_start(toolbar_box, False)
+        self.__vbox.reorder_child(toolbar_box, 0)
 
         self._toolbar_box = toolbar_box
 
@@ -152,35 +153,35 @@ class Window(gtk.Window):
             box.remove(self.tray)
 
         if position == gtk.POS_LEFT:
-            self._hbox.pack_start(tray, False)
+            self.__hbox.pack_start(tray, False)
         elif position == gtk.POS_RIGHT:
-            self._hbox.pack_end(tray, False)
+            self.__hbox.pack_end(tray, False)
         elif position == gtk.POS_BOTTOM:
-            self._vbox.pack_end(tray, False)
+            self.__vbox.pack_end(tray, False)
 
         self.tray = tray
 
     def add_alert(self, alert):
         self._alerts.append(alert)
         if len(self._alerts) == 1:
-            self._vbox.pack_start(alert, False)
+            self.__vbox.pack_start(alert, False)
             if self._toolbar_box is not None:
-                self._vbox.reorder_child(alert, 1)
+                self.__vbox.reorder_child(alert, 1)
             else:
-                self._vbox.reorder_child(alert, 0)
+                self.__vbox.reorder_child(alert, 0)
 
     def remove_alert(self, alert):
         if alert in self._alerts:
             self._alerts.remove(alert)
             # if the alert is the visible one on top of the queue
             if alert.get_parent() is not None:
-                self._vbox.remove(alert)
+                self.__vbox.remove(alert)
                 if len(self._alerts) >= 1:
-                    self._vbox.pack_start(self._alerts[0], False)
+                    self.__vbox.pack_start(self._alerts[0], False)
                     if self._toolbar_box is not None:
-                        self._vbox.reorder_child(self._alerts[0], 1)
+                        self.__vbox.reorder_child(self._alerts[0], 1)
                     else:
-                        self._vbox.reorder_child(self._alert[0], 0)
+                        self.__vbox.reorder_child(self._alert[0], 0)
 
     def __window_realize_cb(self, window):
         group = gtk.Window()