fltk/test/fast_slow.fl

# data file for the Fltk User Interface Designer (fluid)
version 1.0400
header_name {.h}
code_name {.cxx}
Function {} {open
} {
  Fl_Window {} {open selected
    xywh {397 202 318 443} type Double resizable visible
  } {
    Fl_Slider control {
      label {move
this}
      callback {fast->value(o->value());
if (!Fl::pushed()) slow->value(o->value());}
      xywh {90 200 30 200}
      code0 {o->when(FL_WHEN_CHANGED|FL_WHEN_RELEASE|FL_WHEN_NOT_CHANGED);}
    }
    Fl_Slider fast {
      label {fast
redraw}
      xywh {140 200 30 200}
      code0 {o->set_output();}
    }
    Fl_Slider slow {
      label {slow
redraw}
      xywh {190 200 30 200}
      code0 {o->set_output();}
    }
    Fl_Box {} {
      label {The left slider has changed( FL_WHEN_CHANGED | FL_WHEN_RELEASE | FL_WHEN_NOT_CHANGED) so it produces a callback on both drag and release mouse events.
The middle slider (representing a widget with low overhead) is changed on every mouse movement.
The right slider (representing a widget with high overhead) is only updated when the mouse is released, by checking if Fl::pushed() is zero.}
      xywh {10 10 300 180} box DOWN_BOX color 53 selection_color 47 labelfont 4 labelsize 12 align 148
    }
  }
}