> This works, but doesn't solve the problem of some of the
> opened window
> having pending work to be done.
>
> If some opened window has a pending work how we can allow the
> user to
> cancel the application to exit and finish the pending work ?
You probably need a "dirty" flag so you can tell which windows might
need further processing.
Something like this might work...
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/fl_ask.H> // fl_alert, fl_choice, etc.
class CloseWin : public Fl_Double_Window {
public:
int dirty;
CloseWin(int W, int H, char *L) : Fl_Double_Window(W, H, L) {
dirty = 0;
};
void close_hide(void){
if(dirty) {
fl_alert("Window has unsaved data!");
}
else {
hide();
}
};
};
static void cb_close(Fl_Widget*, void*) {
Fl_Window *win = Fl::first_window();
while(win) {
CloseWin *tmp = (CloseWin *)win;
win = Fl::next_window(win);
tmp->close_hide();
}
}
int main(int argc, char **argv) {
CloseWin *w1 = new CloseWin(500, 300, "Win 1");
w1->box(FL_FLAT_BOX);
w1->end();
w1->callback(cb_close);
CloseWin *w2 = new CloseWin(500, 300, "Win 2");
w2->box(FL_FLAT_BOX);
w2->end();
CloseWin *w3 = new CloseWin(500, 300, "Win 3");
w3->box(FL_FLAT_BOX);
w3->end();
w3->dirty = 1;
w1->show(argc, argv);
w2->show();
w3->show();
return Fl::run();
}
/* end of file */
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