> Very nice, thank you. One question (that I had anyway): if
> you call value(v) on an object the callbacks are disabled,
> right? (Or probably i should say "callbacks are only
> triggered when...(???) so value(v) does not trigger it").
>
> I am asking because this is different from how GTK works. In
> GTK the callback is being called on every widget change even
> on "forced changes" eg on
> gtk_toggle_button_set_active(*button, TRUE);.
>
> I like the FLTK-way better because I almost always had to
> disable callbacks in GTK if I set the widgets to a new value.
>
> However, sometimes it is desired to trigger the callback on
> value(v) changes, like in this MouseWheel demo: changing the
> slider with the wheel has currently no effect.
>
> In this case we would just tell FLTK to trigger the callback:
> ... (your turn) :)
You can use the when() method of the widget to configure what conditions
execute the callback - you need to check the docs, as it varies a bit
from widget to widget, but for example Fl_Button says:
"
0: The callback is not done, instead changed() is turned on.
FL_WHEN_RELEASE: The callback is done after the user successfully clicks
the button, or when a shortcut is typed.
FL_WHEN_CHANGED : The callback is done each time the value() changes
(when the user pushes and releases the button, and as the mouse is
dragged around in and out of the button).
"
And there are a few other cases in other widget types, IIRC.
If you *want* to explicitly trigger a widget's callback
programmatically, then you just do:
widget->do_callback(...);
Passing appropriate parameters, and the widget will execute its callback
as if it were clicked on.
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