OK, didn't get a chance for a coffee break, so I did this over lunch
instead...
Here's the scroll-wheel slider demo:
Save as wheel.cxx then compile with
Fltk-config --compile wheel.cxx
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Value_Slider.H>
class wheel_slider: public Fl_Value_Slider
{
int handle(int);
public:
wheel_slider(int x, int y, int w, int h, const char *l=0) :
Fl_Value_Slider (x,y,w,h,l) {}
};
int wheel_slider::handle(int ev) {
// do the base-class actions
int res = Fl_Value_Slider::handle(ev);
// now check for wheel-mouse events
if (ev == FL_MOUSEWHEEL) {
// for wheel - use dy
int dy = Fl::event_dy();
double v1 = value(); // current value
v1 = increment(v1, dy); // change
v1 = clamp(v1); // clamp to valuator limits
value(v1); // update widget
return 1; // say we ate this event
}
return res;
} // handle
static wheel_slider *level, *l2;
int main(int argc, char **argv) {
Fl_Double_Window *main_win = new Fl_Double_Window(300, 400,
"Slider Window");
main_win->begin();
level = new wheel_slider(135, 20, 30, 195, "Level");
level->type(FL_VERT_NICE_SLIDER);
level->minimum(100);
level->maximum(0);
level->step(1);
l2 = new wheel_slider(20, 270, 260, 30, "Pan");
l2->type(FL_HOR_NICE_SLIDER);
l2->minimum(0);
l2->maximum(100);
l2->step(-1);
main_win->end();
main_win->show(argc, argv);
return Fl::run();
} // main
/* end of file */
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