efl

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