Re: [Ayatana-dev] Unity Lens: results model and items with no valid URI

["Johannes H. Jensen" <joh@xxxxxxxxxxxxxxxxx>]

Hi,

So I'm trying to implement these activation hooks in Python, but I'm
kinda stuck.

I've got the Daemon class implementing Unity.Activation, with the
constructor passing self to the Unity.PlaceController activation
property:

class Daemon(GObject.Object, Unity.Activation):
    def __init__ (self):
        GObject.Object.__init__(self)    # Important!
        << snip >>
        self._ctrl = Unity.PlaceController.new
("/net/launchpad/unityplacetomboy")
        self._ctrl.add_entry (self._entry)
        self._ctrl.props.activation = self
        self._ctrl.export ()

    def activate(self, uri):
        print "activate:" + uri
        return Unity.ActivationStatus.ACTIVATED_HIDE_DASH


As far as I can see, this is how it's done in
unity-place-applications. However, calling the Activation method of
the dbus object (using d-feet, with a bogus url) results in a
segfault:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff384b7db in ?? () from /usr/lib/libunity.so.4
#2  0x00007ffff3858368 in ?? () from /usr/lib/libunity.so.4
#3  0x00007ffff4bff350 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007ffff50cbbcd in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff50cc3a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007ffff50cc9f2 in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007ffff42db051 in ?? ()
   from /usr/lib/python2.7/dist-packages/glib/_glib.so
#8  0x00000000004970ef in PyEval_EvalFrameEx ()
#9  0x000000000049d325 in PyEval_EvalCodeEx ()
#10 0x00000000004ecb02 in PyEval_EvalCode ()
#11 0x00000000004fdc74 in ?? ()
#12 0x000000000042c182 in PyRun_FileExFlags ()
#13 0x000000000042cb4a in PyRun_SimpleFileExFlags ()
#14 0x0000000000418c9e in Py_Main ()
#15 0x00007ffff69c2eff in __libc_start_main ()
   from /lib/x86_64-linux-gnu/libc.so.6
#16 0x00000000004c62b1 in _start ()

Debugging symbols are missing from libunity and I can't find any -dbg
package... Any thoughts on what I might be doing wrong?


Regards,

Johannes



On Tue, Apr 12, 2011 at 11:36 AM, Mikkel Kamstrup Erlandsen
<mikkel.kamstrup@xxxxxxxxxxxxx> wrote:
> On Tue, 2011-04-12 at 02:13 +0200, Johannes H. Jensen wrote:
>> Greetings,
>>
>> I'm writing a Unity Lens for Tomboy Notes. Reading through the docs, I
>> find that each item in the results model needs a "uri" which is to be
>> opened when the item is activated by the user. However, tomboy notes
>> only have an internal URI, one which is not recognized by GNOME or
>> Unity.
>>
>> A a note can be opened with a simple D-Bus call to Tomboy, but how can
>> the activation of an item in the results model be used to trigger such
>> a call? As far as I can see, there exists no signal for this
>> purpose...
>
> Hi Johannes,
>
> This sounds awesome :-)
>
> For these cases Unity has an "Activation" API that can trigger callbacks
> back to the daemon when the user clicks a result. It's described here
> https://wiki.ubuntu.com/Unity/Lenses#Activation%20Hooks. The Apps place
> use it to open the Software Center on the correct app when you click one
> in the Apps Available for Download group. Check out
> lp:unity-place-applications to see a working example of this.
>
> The usual way of doing this is to construct some private URI scheme like
> unity-tomboy://$internal_tomboy_uri and register activation for that
> with an entry like the following in your .place file:
>
> [Activation]
> URIPattern=unity-tomboy://.+
>
> You must hen implement the Unity.Activation interface from libunity and
> register it to your Unity.PlaceController. The registration is easy as
> the activation backend is just a property on the controller. So it's
> just ctrl.activation = my_activation_instance.
>
> Honestly, I am not exactly sure how to implement Unity.Activation from
> Python, but from Vala or C it should be straight forward.
>
> Cheers,
> Mikkel
>
>