ref: 2c23de27d5006e969106fad672399fafe6464845
dir: /DoConfig/fltk/test/fast_slow.fl/
# data file for the Fltk User Interface Designer (fluid) version 1.0305 header_name {.h} code_name {.cxx} Function {} {open } { Fl_Window {} {open xywh {397 202 318 443} type Double hide resizable } { 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} selected xywh {140 200 30 200} code0 {o->set_output();} } Fl_Slider slow { label {slow redraw} selected 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 } } }