Change the Activity execute method to add a result boolean (handle/not handled).

When the camera key is pressed the Shell send and command to the active activity,
if that's not handled than it startup org.laptop.CameraActivity.

shell/view/ActivityHost.py

@@ -90,6 +90,9 @@ class ActivityHost:
         else:
             return profile.get_color()
 
+    def execute(self, command, args):
+        self._activity.execute(command, args)
+
     def share(self):
         self._activity.share()
         self._chat_widget.share()

shell/view/Shell.py

@@ -88,9 +88,12 @@ class Shell(gobject.GObject):
         self._frame = Frame(self)
         self._frame.show_and_hide(3)
 
-    def _open_terminal_cb(self):
-        self.start_activity('org.sugar.Terminal')
-        return False
+    def _handle_camera_key(self):
+        if self._current_host:
+            if self._current_host.execute('camera', []):
+                return
+
+        self.start_activity('org.laptop.CameraActivity')
 
     def __global_key_pressed_cb(self, grabber, key):
         if key == 'F1':
@@ -114,7 +117,7 @@ class Shell(gobject.GObject):
         elif key == '<shft><alt>F10':
             self.toggle_chat_visibility()
         elif key == '0xDC': # Camera key
-            pass
+            self._handle_camera_key()
         elif key == '0xE0': # Overlay key
             self.toggle_chat_visibility()
         elif key == '0x93': # Frame key

sugar/activity/Activity.py

@@ -85,9 +85,9 @@ class ActivityDbusService(dbus.service.Object):
         return self._activity.get_shared()
 
     @dbus.service.method(ACTIVITY_INTERFACE,
-                         in_signature="sas", out_signature="")
+                         in_signature="sas", out_signature="b")
     def execute(self, command, args):
-        self._activity.execute(command, args)
+        return self._activity.execute(command, args)
 
 class Activity(gtk.Window):
     """Base Activity class that all other Activities derive from."""
@@ -170,7 +170,7 @@ class Activity(gtk.Window):
 
     def execute(self, command, args):
         """Execute the given command with args"""
-        pass
+        return False
 
     def __destroy_cb(self, window):
         if self._bus: