> > You have to realize a blinking message, or an object which
> periodically swaps two images :
> > think of an alarm icon.
> > The alarm is sounding, and the icon keeps alternating red/yellow horn
> images until the user pushes the ack button.
> >
> > Use a timer to blink... but things are not always "smooth blinking".
> > Not a big problem, anyway... just would like to know if there is a
> clever way to assure a smooth blinking
> > (usually we are speaking of small objects).
Not really sure this is what was being asked, but here's a simple demo of
"blinking" widgets.
Maybe this is what was wanted?
----------------------
//
// Flashing Boxes
//
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Box.H>
static Fl_Double_Window *main_win = 0;
static Fl_Button *quit_bt = 0;
static Fl_Box *box1 = 0;
static Fl_Box *box2 = 0;
static void cb_quit(Fl_Widget *, void *) {
main_win->hide();
} // cb_quit
void update_box1(void *) {
static int state = 0;
if(state) {
state = 0;
box1->color(FL_GREEN);
}
else {
state = -1;
box1->color(FL_RED);
}
Fl::repeat_timeout(0.7, update_box1);
box1->redraw();
} // update_box1
void update_box2(void *) {
static int state = 0;
static int step = 1;
const int thd = 15;
state += step;
if(state >= thd) {
step = -1;
}
else if (state <= 0) {
step = 1;
}
float alpha = (float)state / (float)thd;
Fl_Color col = fl_color_average(FL_RED, FL_BACKGROUND_COLOR, alpha);
box2->color(col);
Fl::repeat_timeout(0.05, update_box2);
box2->redraw();
} // update_box2
int main(int argc, char ** argv) {
main_win = new Fl_Double_Window(370, 230, "Flashing Widgets");
main_win->begin();
box1 = new Fl_Box(10, 10, 60, 30, "ALERT!");
box1->box(FL_FLAT_BOX);
box1->color(FL_GREEN);
box2 = new Fl_Box(80, 10, 60, 30, "ALERT!");
box2->box(FL_FLAT_BOX);
box2->color(FL_BACKGROUND_COLOR);
quit_bt = new Fl_Button(300, 190, 60, 30, "Quit");
quit_bt->box(FL_THIN_UP_BOX);
quit_bt->callback(cb_quit);
main_win->end();
main_win->show(argc,argv);
Fl::add_timeout(0.3, update_box1);
Fl::add_timeout(0.05, update_box2);
return Fl::run();
} // main
// end of file //
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