Radio is a widget that allows for 1 or more options to be displayed and have the user choose only 1 of them.

A radio object contains an indicator, an optional Label and an optional icon object. While it's possible to have a group of only one radio they, are normally used in groups of 2 or more.

elm_radio objects are grouped in a slightly different, compared to other UI toolkits. There is no separate group name/id to remember or manage. The members represent the group, there are the group. To make a group, use elm_radio_group_add() and pass existing radio object and the new radio object.

The radio object(s) will select from one of a set of integer values, so any value they are configuring needs to be mapped to a set of integers. To configure what value that radio object represents, use elm_radio_state_value_set() to set the integer it represents. To set the value the whole group(which one is currently selected) is to indicate use elm_radio_value_set() on any group member, and to get the groups value use elm_radio_value_get(). For convenience the radio objects are also able to directly set an integer(int) to the value that is selected. To specify the pointer to this integer to modify, use elm_radio_value_pointer_set(). The radio objects will modify this directly. That implies the pointer must point to valid memory for as long as the radio objects exist.

This widget inherits from the Layout one, so that all the functions acting on it also work for radio objects.

This widget emits the following signals, besides the ones sent from Layout:

• "changed" - This is called when the radio object is selected. If you want to trace the state change of a radio group, you should add this callback to all the radio objects in that group.
• "focused" - When the radio has received focus. (since 1.8)
• "unfocused" - When the radio has lost focus. (since 1.8)
• "language,changed" - the program's language changed (since 1.9)

Default content parts of the radio widget that you can use for are:

• "icon" - An icon of the radio

Default text parts of the radio widget that you can use for are:

• "default" - A label of the radio

Supported elm_object common APIs.

• elm_object_part_text_set
• elm_object_part_text_get
• elm_object_part_content_set
• elm_object_part_content_get
• elm_object_part_content_unset
• elm_object_disabled_set
• elm_object_disabled_get

Radio example show most of this API in action.

Function Documentation