Check example

This example will show 2 checkboxes, one with just a label and the second one with both a label and an icon. This example also illustrates how to have the checkbox change the value of a variable and how to react to those changes.

We will start with the usual setup code:

EAPI_MAIN int
elm_main(int argc, char **argv)
{
Evas_Object *win, *cb, *cb2, *icon;
Eina_Bool value;
elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
win = elm_win_util_standard_add("check", "Check");
elm_win_autodel_set(win, EINA_TRUE);

And now we create our first checkbox, set its label, tell it to change the value of `value` when the checkbox stats is changed and ask to be notified of state changes:

cb = elm_check_add(win);
elm_object_text_set(cb, "checkbox");
elm_check_state_pointer_set(cb, &value);
evas_object_smart_callback_add(cb, "changed", _print, &value);
evas_object_move(cb, 10, 10);
evas_object_resize(cb, 200, 30);
evas_object_show(cb);

For our second checkbox we are going to set an icon so we need to create and icon:

icon = evas_object_rectangle_add(evas_object_evas_get(win));
evas_object_color_set(icon, 0, 255, 0, 255);
evas_object_resize(icon, 20, 20);
evas_object_show(icon);

Note
  For simplicity we are using a rectangle as icon, but any evas object can be used.

And for our second checkbox we set the label, icon and state to true:

cb2 = elm_check_add(win);
elm_object_text_set(cb2, "another checkbox");
elm_check_state_set(cb2, EINA_TRUE);
elm_object_part_content_set(cb2, "icon", icon);
evas_object_move(cb2, 10, 50);
evas_object_resize(cb2, 200, 30);
evas_object_show(cb2);

We now do some more setup:

evas_object_resize(win, 200, 100);
evas_object_show(win);
elm_run();
return 0;
}
ELM_MAIN()

And finally implement the callback that will be called when the first checkbox's state changes. This callback will use `data` to print a message:

static void
_print(void *data, Evas_Object *obj, void *event_info)
{
printf("check %smarked\n", *((Eina_Bool*)data) ? "" : "un");
}

Note
  This work because `data` is `value(from the main function)` and `value` is changed when the checkbox is changed.

Our example will look like this: