void butt_cb(Fl_Widget *butt, void *data)
{
// Deactivate the button
butt->deactivate(); // prevent button from being pressed again
Fl::check(); // give fltk some cpu to gray out button
// Make the progress bar
Fl_Window *w = (Fl_Window*)data; // access parent window
w->begin(); // add progress bar to it..
Fl_Progress *progress = new Fl_Progress(10,50,200,30);
progress->minimum(0); // set progress range to be 0.0 ~ 1.0
progress->maximum(1);
progress->color(0x88888800); // background color
progress->selection_color(0x4444ff00); // progress bar color
progress->labelcolor(FL_WHITE); // percent text color
w->end(); // end adding to window
// Computation loop..
for ( int t=1; t<=500; t++ )
{
progress->value(t/500.0); // update progress bar with 0.0 ~ 1.0 value
char percent[10];
sprintf(percent, "%d%%", int((t/500.0)*100.0));
progress->label(percent); // update progress bar's label
Fl::check(); // give fltk some cpu to update the screen
Sleep(1000); // 'your stuff' that's compute intensive
}
// Cleanup
w->remove(progress); // remove progress bar from window
delete(progress); // deallocate it
butt->activate(); // reactivate button
w->redraw(); // tell window to redraw now that progress removed
}
