Radio Buttons

#include <stdio.h>
#include "graphapp.h"

Control *tomato, *barbeque;

void place_order(Control *b)
{
  printf("Sauce:\n");
  if (is_checked(tomato))     printf("  Tomato\n");
  if (is_checked(barbeque))   printf("  Barbeque\n");
  exit(0);
}

void choose(Control *sauce)
{
  if (sauce == tomato)         printf("Tomato sauce chosen\n");
  else if (sauce == barbeque)  printf("BBQ sauce chosen\n");
}

int main(int argc, char *argv[])
{
  App *app;
  Window *w;
  Rect r;

  app = new_app(argc, argv);
  w = newwindow(app, rect(0,0,200,180), "Pizza", STANDARD_WINDOW);
  r = rect(10,10,100,25);

  tomato   = new_radio_button(w, r, "Tomato", choose); r.y += 30;
  barbeque = new_radio_button(w, r, "BBQ", choose);    r.y += 30;
  check(tomato);

  new_button(w, r, "Order Pizza", place_order);
  show_window(w);
  main_loop(app);
  return 0;
}

Notes:

• Use new_radio_button to create a radio button control.
• Notice how the choose call-back function has been used by both radio buttons. Whenever either radio button is toggled, that function is called.
• The is_checked function determines if a radio button is checked.