> As we know, the button widget has a callback, by default it
> will excute this callback afte we push and release the
> button. But how to add another callback to the button widget.
> So I can excute callback A when push the button, and excute
> callback B when release the button. Thanks.
As Edzard says, it is pretty easy to check the event type in the
callback. Below is a (fltk-1) fluid file that illustrates a minimal
example of doing that, should show you how to proceed. Fltk-2 is the
same, but I don't use it...
> My fltk version is v2.0
Yup - as I have said before; Good luck with that!
Anyway, here's the example. Simple, but works OK.
------------------------
# data file for the Fltk User Interface Designer (fluid)
version 1.0110
header_name {.h}
code_name {.cxx}
decl {\#include <stdio.h>} {}
Function {} {open
} {
Fl_Window main_win {open
xywh {494 312 376 278} type Double visible
} {
Fl_Button bt_1 {
label button
callback {int ev = Fl::event();
if(ev == FL_PUSH) puts("down");
if(ev == FL_RELEASE) puts("up");
fflush(stdout);} selected
xywh {25 25 80 40} when 1
}
Fl_Button quit_bt {
label Quit
callback {main_win->hide();}
xywh {265 210 75 35}
}
}
}
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