Rotary Selector

This feature is supported in wearable applications only.

The rotary selector component is optimized for wearable circular devices. It is composed of a selector and multiple items surrounding the selector. The rotary selector can be used to select an item or to move to the next or previous page through a rotary event.

The rotary selector handle can use the elm_layout functions, because the rotary selector handle is an elm_layout object.

Figure: Rotary selector component

Rotary selector component

Adding a Rotary Selector Component

To create a rotary selector, use the eext_rotary_selector_add() function:

Evas_Object *rotary_selector;
Evas_Object *parent;

Rotary_selector = eext_rotary_selector_add(parent);

Activating a Rotary Event

To activate or deactivate the rotary selector, use the eext_rotary_object_event_activated_set() function:

eext_rotary_object_event_activated_set(rotary_selector, EINA_TRUE);

If the second parameter is EINA_TRUE, the rotary selector can receive rotary events.

Adding Rotary Selector Items


A maximum of 11 items can be displayed on one page of the rotary selector. Any excess items are arranged on the next page.

To add an item:

  1. Append the new item with the eext_rotary_selector_item_append() function:

    Eext_Object_Item * item;
    Evas_Object *image;
    /* Append item */
    item = eext_rotary_selector_item_append(rotary_selector);
  2. Configure the item (for more information, see Configuring the Selector and Items).

    In the following example, 2 icons are set for the item and selector:

    /* Set item icon */
    image = elm_image_add(rotary_selector);
    elm_image_file_set(image, "music_controller_btn_play.png", NULL);
    eext_rotary_selector_item_part_content_set(item, "item,icon",
                                               EEXT_ROTARY_SELECTOR_ITEM_STATE_NORMAL, image);
    /* Set selector content icon */
    image = elm_image_add(rotary_selector);
    elm_image_file_set(image, "music_controller_btn.png", NULL);
    eext_rotary_selector_item_part_content_set(item, "selector,icon",
                                               EEXT_ROTARY_SELECTOR_ITEM_STATE_NORMAL, image);
  3. Define the item texts. The text is displayed in the selector when the item is selected.

    In the following example, the main text is defined for the new item:

    /* Set selector main text */
    eext_rotary_selector_item_part_text_set(item, "selector,main_text", "Options");

    The following table shows the functions you can use to set the main and sub text of an item.

    Table: Item texts

    Text Setting function View
    selector,main_text eext_rotary_selector_item_part_text_set()
    selector,sub_text eext_rotary_selector_item_part_text_set()

Configuring the Selector and Items

You can configure the color and content of various rotary selector parts.

The following table shows the configurable rotary selector parts.

Table: Configurable rotary selector parts

Part Setting function View
selector,main_text eext_rotary_selector_item_part_color_set() main_text
selector,sub_text eext_rotary_selector_item_part_color_set() sub_text
Item content
Selector content

You can also configure the selector and item appearance based on their current state:

  • The available selector states are:

    • EEXT_ROTARY_SELECTOR_SELECTOR_STATE_NORMAL: Selector is in a normal state.
    • EEXT_ROTARY_SELECTOR_SELECTOR_STATE_PRESSED: Selector is in a pressed state.

    For example, to set the selector color for a normal state selector:

    eext_rotary_selector_part_color_set(selector, "selector,bg_image",
                                        100, 100, 100, 255);
  • The available selector item states are:

    • EEXT_ROTARY_SELECTOR_ITEM_STATE_NORMAL: Item is in a normal state.
    • EEXT_ROTARY_SELECTOR_ITEM_STATE_PRESSED: Item is in a pressed state.

    For example, to set the item color for a normal state item:

    eext_rotary_selector_item_part_color_set(item, "item,icon",
                                             100, 100, 100, 255);

Using the Rotary Selector Callbacks

To receive notifications about the rotary selector events, listen for the following signals:

  • item,selected: The item is selected.
  • item,clicked: The item is clicked.


The signal list in the API reference can be more extensive, but only the above signals are actually supported in Tizen.

In both these signals, the event_info callback parameter is NULL.

To register and define a callback for the item,clicked signal:

    evas_object_smart_callback_add(rotary_selector, "item,clicked", item_clicked_cb, data);

/* Callback for the "item,clicked" signal */
/* Called when the item is clicked by the user */
item_clicked_cb(void *data, Evas_Object *obj, void *event_info)
    dlog_print(DLOG_INFO, LOG_TAG, "Item clicked\n");
  • Dependencies
    • Tizen 2.3.1 and Higher for Wearable