Radio Buttons

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

Control *tomato, *barbeque;
Control *cash, *credit;

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

  printf("Payment:\n");
  if (is_checked(cash))
    printf("  Cash\n");
  if (is_checked(credit))
    printf("  Credit\n");

  exit(0);
}

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

  app = new_app(argc, argv);
  w = new_window(app, rect(0,0,200,350),
                 "Pizza", STANDARD_WINDOW);
  r = rect(10,10,100,30);

  new_label(w, r, "Sauce:", ALIGN_LEFT);             r.y += 35;

  tomato   = new_radio_button(w, r, "Tomato", NULL); r.y += 35;
  barbeque = new_radio_button(w, r, "BBQ", NULL);    r.y += 35;
  check(tomato);

  new_radio_group();

  new_label(w, r, "Payment:", ALIGN_LEFT);           r.y += 35;

  cash     = new_radio_button(w, r, "Cash", NULL);   r.y += 35;
  credit   = new_radio_button(w, r, "Credit", NULL); r.y += 35;
  check(cash);

  new_button(w, r, "Order Pizza", place_order);

  show_window(w);
  main_loop(app);
  return 0;
}

Notes:

• Radio buttons are mutually exclusive.
• Normally, all radio buttons on a window belong to one group, so only one can be active at any one time.
• The new_radio_group function creates a new group, which subsequently created radio buttons will belong to. This allows different sets of radio buttons.