layout_example_02.c

//Compile with:
//gcc -g layout_example_02.c -o layout_example_02 `pkg-config --cflags --libs elementary`
 
#include <Elementary.h>
 
#define TABLE "example/table"
#define BOX "example/box"
#define TITLE "example/title"
#define SWALLOW "example/custom"
 
static const char *images[] = { "home", "close", "arrow_up", "arrow_down", NULL };
 
struct _App {
     int current;
};
 
static void
_signal_cb(void *data, Evas_Object *o, const char *emission, const char *source EINA_UNUSED)
{
   struct _App *app = data;
   Evas_Object *icon = elm_object_part_content_get(o, "elm.swallow.content");
 
   printf("signal received\n");
 
   if (!strcmp("elm,action,back", emission))
     app->current--;
   else if (!strcmp("elm,action,next", emission))
     app->current++;
 
   if (app->current < 0)
     app->current = (sizeof(images) / sizeof(images[0])) - 2;
   else if (images[app->current] == NULL)
     app->current = 0;
 
   elm_icon_standard_set(icon, images[app->current]);
}
 
EAPI_MAIN int
elm_main(int argc EINA_UNUSED, char **argv EINA_UNUSED)
{
   Evas_Object *win, *layout, *icon;
   struct _App app;
 
   app.current = 0;
 
   elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
 
   win = elm_win_util_standard_add("layout", "Layout");
   elm_win_autodel_set(win, EINA_TRUE);
 
   // Adding layout and filling it with widgets
   layout = elm_layout_add(win);
   evas_object_size_hint_weight_set(layout, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   elm_win_resize_object_add(win, layout);
   if (!elm_layout_theme_set(
         layout, "layout", "application", "content-back-next"))
     fprintf(stderr, "Failed to set layout");
   evas_object_show(layout);
 
   icon = elm_icon_add(win);
   elm_icon_standard_set(icon, images[app.current]);
   evas_object_size_hint_weight_set(layout, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   elm_object_part_content_set(layout, "elm.swallow.content", icon);
 
   elm_object_signal_callback_add(layout, "elm,action,back", "elm", _signal_cb, &app);
   elm_object_signal_callback_add(layout, "elm,action,next", "elm", _signal_cb, &app);
 
   evas_object_resize(win, 320, 320);
   evas_object_show(win);
 
   elm_run();
 
   return 0;
}
ELM_MAIN()