On 17 Jun 2008, at 18:28, Jane wrote:
> Works great, thank you. I came up with a slightly improved version:
>
> int
> Slider::handle(int ev)
> {
> // do the base-class actions
> int res = Fl_Slider::handle(ev);
>
> // now check for wheel-mouse events & if we are below the pointer
> if (ev == FL_MOUSEWHEEL && this == Fl::belowmouse())
> {
> // for wheel - use dy
> int dy = Fl::event_dy();
> double v1 = value(); // current value
If it were me, I'd evaluate:
double v2 = clamp(increment(v1, dy));
at this point, and use it in the subsequent comparison, and to set
the value if required.
Just to save evaluating increment(...) twice.
> if (v1 == clamp(increment(v1, dy))) // save midi bandwidth :)
> return 1;
> v1 = increment(v1, dy); // change
> value(v1); // update widget
> do_callback(); // trigger callback
> return 1; // say we ate this event
> }
> return res;
> } // handle
>
>
> (I also backported FLTK 1.1.9 to Debian/etch, anyone interested?)
> *Happy* :)
./configure ; make ; make install - who needs package managers!? ;-)
(Well, actually, ./configure --enable-threads --enable-xft usually!)
> I tried to make a SpinnerM class (Spinner with Mousewheel support)
> but failed.
>
> int
> SpinnerM::handle(int ev)
> {
> int res = Fl_Spinner::handle(ev);
> if (ev == FL_MOUSEWHEEL && this == Fl::belowmouse())
> {
> int dy = Fl::event_dy();
> double v1 = value();
I'd suggest you get the step() size here and use that to scale dy
accordingly, so that the scroll-wheel matches the range and step of
the spinner better.
> if (v1 + dy == minimum() || v1 + dy == maximum())
> return 1;
> value(v1 + dy);
> do_callback();
> return 1;
> }
> return res;
> }
>
>
> It never enters the if(). Is there no FL_MOUSEWHEEL event for
> spinners?
It's not the FL_MOUSEWHEEL that fails, it's the belowmouse(). If you
remove that from the test, it works OK.
Not sure why that doesn't work right - may be a bug. Presumably it's
because a spinner is a composite widget, not a straightforward
valuator, I guess. Still, it's odd it doesn't work right.
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