Re: [Discuss-gnuradio] callback function called twice

[Marcus Leech]

On some GUI slider widgets, there's a "call callback only on motion finished" option.  I don't know whether that's available in WxGUI, and whether we use it (and whether the option to use it should be exposed within GRC).

Also, doesn't the callback get called on first instantiation to set the default value?

 

 

on Jul 26, 2013, Tom Rondeau <address@hidden> wrote:

On Wed, Jul 24, 2013 at 5:17 PM, Nemanja Savic <address@hidden> wrote:
> Actually it is not a big deal at all, I am just curious.
> Yes, I am using WXGui slider.
> Thank you Tom
>
> Nemanja

Great. Just wanted to make sure it wasn't doing something else to your code.

Probably just something like it responding to the 'button press' and
'button release' events or just jitter when moving the slider. Those
are pretty common in GUI apps.

Tom


> On Wed, Jul 24, 2013 at 5:39 PM, Tom Rondeau <address@hidden> wrote:
>>
>> On Wed, Jul 24, 2013 at 8:51 AM, Nemanja Savic <address@hidden> wrote:
>> > Hi guys,
>> >
>> > this is kind of very old thread, but the same problem. I started
>> > changing my
>> > blocks for 3.7.0 and callbacks are called twice. Is there any
>> > explanation
>> > for this acting?
>> >
>> > thanks,
>> > Nemanja
>> >
>> >
>> > On Thu, Feb 28, 2013 at 9:53 AM, Nemanja Savic <address@hidden>
>> > wrote:
>> >>
>> >> Was any nonsense in previous post?
>> >>
>> >>
>> >> On Wed, Feb 27, 2013 at 2:16 PM, Nemanja Savic <address@hidden>
>> >> wrote:
>> >>>
>> >>> Hi again GNURADIOers,
>> >>>
>> >>> I have a set member function which is also used as a callback from
>> >>> GRC.
>> >>> It looks like this:
>> >>>
>> >>> void
>> >>> test_file_sink::set_sensitivity(double milisecond)
>> >>> {
>> >>> d_n_samples = (unsigned
>> >>> int)(milisecond*d_sample_rate/1000.0)*d_itemsize;
>> >>> printf("\nd_n_samples: %d\n", d_n_samples);
>> >>> init_old_data_buff();
>> >>> }
>> >>>
>> >>> When I run flowgraph, and change "sensitivity", my callback function
>> >>> is
>> >>> called twice.
>> >>> Is this normal action?
>> >>>
>> >>> Best
>> >>>
>> >>> --
>> >>> Nemanja Savić
>> >>
>> >>
>> >>
>> >>
>> >> --
>> >> Nemanja Savić
>> >
>> > --
>> > Nemanja Savić
>>
>> Nemanja,
>>
>> It's unclear what you are doing when changing the sensitivity? Is this
>> in GRC and using a GUI slider or something? Or are you triggering the
>> callback function some other way? If it's a GUI element, it could just
>> be that the system calls it based on a change in the state, which
>> could mean when you press and release or when you hit a button is one
>> update and when the update to the slider happens it gets triggered
>> again.
>>
>> Is this really a big deal or are you just curious?
>>
>> Tom
>
>
>
>
> --
> Nemanja Savić

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