efl

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//Compile with:
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//gcc -o prefs_example_03 prefs_example_03.c -g `pkg-config --cflags --libs elementary`
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#include <Elementary.h>
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#define WIDTH (500)
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#define HEIGHT (700)
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#define MSG_ID_VEL (1)
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static void
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_update_animation(Evas_Object *prefs, Evas_Object *layout)
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{
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   Eina_Value value;
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   Eina_Bool animation;
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   elm_prefs_item_value_get(prefs, "main:config:options:animation", &value);
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   eina_value_get(&value, &animation);
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   if (animation)
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     elm_layout_signal_emit(layout, "start", "animation");
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   else
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     elm_layout_signal_emit(layout, "stop", "animation");
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}
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static void
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_update_animation_time(Evas_Object *prefs, Evas_Object *layout)
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{
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   Eina_Value value;
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   float animation_time;
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   Edje_Message_Float msg;
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   elm_prefs_item_value_get(prefs, "main:config:options:animation_time", &value);
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   eina_value_get(&value, &animation_time);
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   if (animation_time < 0.01) animation_time = 0.01;
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   msg.val = animation_time;
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   edje_object_message_send(elm_layout_edje_get(layout), EDJE_MESSAGE_FLOAT,
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                            MSG_ID_VEL, &msg);
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}
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static void
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_update(Evas_Object *prefs, Evas_Object *layout)
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{
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   _update_animation(prefs, layout);
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   _update_animation_time(prefs, layout);
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}
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static void
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_page_loaded_cb(void *data, Evas_Object *obj, void *event_info EINA_UNUSED)
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{
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   Evas_Object *layout = data;
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   _update(obj, layout);
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}
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static void
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_item_changed_cb(void *data, Evas_Object *obj, void *event_info)
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{
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   const char *item = event_info;
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   Evas_Object *layout = data;
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   if (!strcmp(item, "main:config:options:animation_time"))
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     _update_animation_time(obj, layout);
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   else if (!strcmp(item, "main:config:options:animation"))
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     _update_animation(obj, layout);
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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, *prefs, *layout;
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   Elm_Prefs_Data *prefs_data;
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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("Prefs", "Prefs Example 03");
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   elm_win_autodel_set(win, EINA_TRUE);
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   layout = elm_layout_add(win);
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   elm_layout_file_set(layout, "prefs_example_03.edj", "prefs_edje");
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   prefs = elm_prefs_add(win);
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   evas_object_size_hint_weight_set(prefs, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
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   evas_object_resize(prefs, WIDTH, HEIGHT);
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   evas_object_show(prefs);
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   evas_object_smart_callback_add(prefs, "page,loaded", _page_loaded_cb,
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                                  layout);
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   evas_object_smart_callback_add(prefs, "item,changed", _item_changed_cb,
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                                  layout);
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   elm_prefs_autosave_set(prefs, EINA_TRUE);
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   prefs_data =
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      elm_prefs_data_new("./prefs_example_03.cfg", NULL, EET_FILE_MODE_READ_WRITE);
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   elm_prefs_file_set(prefs, "prefs_example_03.epb", NULL);
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   elm_prefs_data_set(prefs, prefs_data);
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   elm_prefs_item_swallow(prefs, "main:swal", layout);
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   _update_animation_time(prefs, layout);
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   _update_animation(prefs, layout);
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   evas_object_resize(win, WIDTH, HEIGHT);
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   evas_object_show(win);
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   elm_run();
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   elm_prefs_data_unref(prefs_data);
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   return 0;
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}
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ELM_MAIN()
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