Re: Button depressing

[Tristan Van Berkom <tristan van berkom gmail com>]

Paul Davis wrote:

> On Fri, 2006-05-26 at 14:54 -0700, Joe Van Dyk wrote:
>  
>
> > Hi,
> >
> > I'm rewriting a Xlib graphical application in Gtk.  There's four
> > different states (run, hold, reset, shutdown)  that the application be
> > be in.  The state that the application is in is determined by another
> > application, but the user of the graphical application can request a
> > different "state".
> >
> > Here's a picture of what the buttons for changing the state look like.
> > http://img87.imageshack.us/img87/9717/buttons2mv.png  The application
> > is in "reset" mode currently.  Notice how the reset button is
> > depressed.
> >
> > I'm struggling how to reproduce that look in Gtk.    I initially tried
> > toggle and radio buttons, but I couldn't figure out how to tell a
> > button to be active / toggled without generating a "toggled" event,
> > which would tell the application to send a request to change the
> > state.
> >
> > Any ideas?  I'm guessing I have two solutions.  One is to figure out
> > how to get a normal button to look "depressed" like it does in the
> > picture.  The other solution is to figure out how to be able to tell a
> > toggle button to be toggled without that button emitting a toggled
> > event (which would tell the application to change state, when the user
> > hasn't requested a state change).
> >    
>
> all you seem to be doing is changing the colors. and no, GTK has no
> method of making a button appear "pressed" without going through the
> code path for an actual press. i just use a separate variable called
> something like in_my_special_context. the handler for the button
> click/press/release events simply checks to see if this is true, and
> returns true without doing anything. you set the var to true when you
> programmatically toggle the button, then back to false afterwards.
>
>  
Note also you can use g_signal_handler_block_by_func() for this
purpose.

Cheers,
                           -Tristan