Re: SpinButton: how to avoid calling signal handler when set_value()

[pozzugno <pozzugno gmail com>]

I already thought of blocking handlers during refresh, but it means 
adding two instructions (_block and _unblock) for each set_value().

A simple and clear sequence of instructions:

  _set_value()
  _set_value()
  ..

will be transformed in a complex, long and cryptic sequence of 
instructions:

  _block()
  _set_value()
  _unblock()
  _block()
  _set_value()
  _unblock()


I hoped there was another better solution. Actually I'm using a flag 
that is checked in the handler:

  refreshing = True
  _set_value()
  _set_value()
  ...
  refreshing = False

  # In the handler
  if not refreshing:
    # Process the handler

This is simple enough, but I have to remember to check the flag in the 
handler and this is error prone.


Il 01/11/2016 20:33, Chris Moller ha scritto:
> Have you tried
>
> g_signal_handler_block (gpointer instance, gulong handler_id);
>
> and
>
> g_signal_handler_unblock (gpointer instance, gulong handler_id);
>
> Putting these before and after your set_value() should temporarily 
> block the handler.
>
> You get the handler_id from g_signal_connect(...):
>
> handler_id = g_signal_connect(...);
>
>
>
> On 11/01/16 11:29, pozzugno wrote:
> > I have a SpinButton with an associated Adjustment. I connected a 
> > handler for "value-changed" signal, because I have to make something 
> > when the user changes the value. I sometimes need to change the value 
> > in the code, using set_value() method of SpinButton or Adjustment. In 
> > this case, I don't want to execute the signal handler.
> >
> > I will try to describe the situation. I have many widgets on the 
> > window, mainly SpinButton (but I have Entry too). I retrieve the 
> > values from remote, so I use set_value() methods for each widget when 
> > the values are received. The user can change some values and I need 
> > to detect this, because I have to send the new values to remote. So I 
> > have to connect a custom signal handler. Of course, I have to avoid 
> > calling the signal handler when the values are changed by code.
> >
> > Is it possible?
> >
> >
> >
> > _______________________________________________
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> > gtk-app-devel-list gnome org
> > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
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