An index widget gives you an index for quick access to whichever group of other UI items one might have. It's a list of text items (usually letters, for alphabetically ordered access).

Index widgets are by default hidden and just appear when the user clicks over it's reserved area in the canvas. In its default theme, it's an area one finger wide on the right side of the index widget's container.

When items on the index are selected, smart callbacks get called, so that its user can make other container objects to show a given area or child object depending on the index item selected. You'd probably be using an index together with lists, generic lists or general grids.

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

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

"changed" - When the selected index item changes. event_info is the selected item's data pointer.
"delay,changed" - When the selected index item changes, but after a small idling period. event_info is the selected item's data pointer.
"selected" - When the user releases a mouse button and selects an item. event_info is the selected item's pointer.
"level,up" - when the user moves a finger from the first level to the second level
"level,down" - when the user moves a finger from the second level to the first level
"language,changed" - the program's language changed
"focused" - When the index has received focus. (since 1.8)
"unfocused" - When the index has lost focus. (since 1.8)

The "delay,changed" event is so that it'll wait a small time before actually reporting those events and, moreover, just the last event happening on those time frames will actually be reported.

Supported elm_object_item common APIs

elm_object_item_del

Here are some examples on its usage:

Functions
void	elm_index_autohide_disabled_set (Elm_Index *obj, Eina_Bool disabled)
	Enable or disable auto hiding feature for a given index widget.
Eina_Bool	elm_index_autohide_disabled_get (const Elm_Index *obj)
	Enable or disable auto hiding feature for a given index widget.
void	elm_index_omit_enabled_set (Elm_Index *obj, Eina_Bool enabled)
	Enable or disable omit feature for a given index widget.
Eina_Bool	elm_index_omit_enabled_get (const Elm_Index *obj)
	Enable or disable omit feature for a given index widget.
void	elm_index_standard_priority_set (Elm_Index *obj, int priority)
	Control standard_priority group of index. Priority group will be shown as many items as it can, and other group will be shown one character only.
int	elm_index_standard_priority_get (const Elm_Index *obj)
	Control standard_priority group of index. Priority group will be shown as many items as it can, and other group will be shown one character only.
void	elm_index_delay_change_time_set (Elm_Index *obj, double dtime)
	Set a delay change time for index object.
double	elm_index_delay_change_time_get (const Elm_Index *obj)
	Set a delay change time for index object.
void	elm_index_indicator_disabled_set (Elm_Index *obj, Eina_Bool disabled)
	Control the indicator as to be disabled.
Eina_Bool	elm_index_indicator_disabled_get (const Elm_Index *obj)
	Control the indicator as to be disabled.
void	elm_index_item_level_set (Elm_Index *obj, int level)
	Set the items level for a given index widget.
int	elm_index_item_level_get (const Elm_Index *obj)
	Set the items level for a given index widget.
void	elm_index_level_go (Elm_Index *obj, int level)
	Flush the changes made to the index items so they work correctly.
Elm_Widget_Item *	elm_index_item_prepend (Elm_Index obj, const char letter, Evas_Smart_Cb func, const void *data)
	Prepend a new item on a given index widget.
void	elm_index_item_clear (Elm_Index *obj)
	Removes all items from a given index widget.
Elm_Widget_Item *	elm_index_item_insert_after (Elm_Index obj, Elm_Widget_Item after, const char letter, Evas_Smart_Cb func, const void data)
	Insert a new item into the index object after item `after`.
Elm_Widget_Item *	elm_index_item_find (Elm_Index obj, const void data)
	Find a given index widget's item, using item data.
Elm_Widget_Item *	elm_index_item_insert_before (Elm_Index obj, Elm_Widget_Item before, const char letter, Evas_Smart_Cb func, const void data)
	Insert a new item into the index object before item `before`.
Elm_Widget_Item *	elm_index_item_append (Elm_Index obj, const char letter, Evas_Smart_Cb func, const void *data)
	Append a new item on a given index widget.
Elm_Widget_Item *	elm_index_selected_item_get (const Elm_Index *obj, int level)
	Returns the last selected item, for a given index widget.
Elm_Widget_Item *	elm_index_item_sorted_insert (Elm_Index obj, const char letter, Evas_Smart_Cb func, const void *data, Eina_Compare_Cb cmp_func, Eina_Compare_Cb cmp_data_func)
	Insert a new item into the given index widget, using `cmp_func` function to sort items (by item handles).
Evas_Object *	elm_index_add (Evas_Object *parent)
void	elm_index_horizontal_set (Evas_Object *obj, Eina_Bool horizontal)
	Enable or disable horizontal mode on the index object.
Eina_Bool	elm_index_horizontal_get (const Evas_Object *obj)
	Get enable or disable status of horizontal mode on the index object.

Function Documentation

Evas_Object* elm_index_add ( Evas_Object * parent )

Add a new index widget to the given parent Elementary (container) object

Parameters:

parent The parent object

Returns:: a new index widget handle or NULL, on errors

This function inserts a new index widget on the canvas.

Since :: 2.3

Examples:: index_example_01.c, and index_example_02.c.

Eina_Bool elm_index_autohide_disabled_get ( const Elm_Index * obj )

Enable or disable auto hiding feature for a given index widget.

Parameters:

[in] obj The object.

Returns:: true to disable auto hiding, false to enable

Since :: 2.3

Examples:: index_example_01.c.

void elm_index_autohide_disabled_set	(	Elm_Index *	obj,
		Eina_Bool	disabled
	)

Enable or disable auto hiding feature for a given index widget.

Parameters:

[in]	obj	The object.
[in]	disabled	`true` to disable auto hiding, `false` to enable

Since :: 2.3

Examples:: index_example_01.c, and index_example_02.c.

double elm_index_delay_change_time_get ( const Elm_Index * obj )

Set a delay change time for index object.

Note:: delay time is 0.2 sec by default.

Parameters:

[in] obj The object.

Returns:: The delay change time to set.

Since :: 2.3

void elm_index_delay_change_time_set	(	Elm_Index *	obj,
		double	dtime
	)

Set a delay change time for index object.

Note:: delay time is 0.2 sec by default.

Parameters:

[in]	obj	The object.
[in]	dtime	The delay change time to set.

Since :: 2.3

Eina_Bool elm_index_horizontal_get ( const Evas_Object * obj )

Get enable or disable status of horizontal mode on the index object.

Note:: Vertical mode is set by default.

Returns the current status of horizontal mode on index object. On horizontal mode items are displayed on index from left to right, instead of from top to bottom. Also, the index will scroll horizontally.

Returns:: Current status of horizontal mode on index object. true if horizontal mode is enabled or false if disabled.

Since :: 2.3

void elm_index_horizontal_set	(	Evas_Object *	obj,
		Eina_Bool	horizontal
	)

Enable or disable horizontal mode on the index object.

Note:: Vertical mode is set by default.

On horizontal mode items are displayed on index from left to right, instead of from top to bottom. Also, the index will scroll horizontally.

Parameters:

[in] horizontal true to enable horizontal or false to disable it, i.e., to enable vertical mode. it's an area one Fingers "finger" wide on the bottom side of the index widget's container.

Since :: 2.3

Eina_Bool elm_index_indicator_disabled_get ( const Elm_Index * obj )

Control the indicator as to be disabled.

In Index widget, Indicator notes popup text, which shows a letter has been selecting.

Parameters:

[in] obj The object.

Returns:: true to disable it, false to enable it

Since :: 2.3

void elm_index_indicator_disabled_set	(	Elm_Index *	obj,
		Eina_Bool	disabled
	)

Control the indicator as to be disabled.

In Index widget, Indicator notes popup text, which shows a letter has been selecting.

Parameters:

[in]	obj	The object.
[in]	disabled	`true` to disable it, `false` to enable it

Since :: 2.3

Elm_Widget_Item* elm_index_item_append	(	Elm_Index *	obj,
		const char *	letter,
		Evas_Smart_Cb	func,
		const void *	data
	)

Append a new item on a given index widget.

Despite the most common usage of the letter argument is for single char strings, one could use arbitrary strings as index entries.

item will be the pointer returned back on $"changed", "delay,changed" and $"selected" smart events.

Parameters:

[in]	obj	The object.
[in]	letter	Letter under which the item should be indexed
[in]	func	The function to call when the item is selected.
[in]	data	The item data to set for the index's item

Returns:: A handle to the item added or NULL, on errors

Since :: 2.3

Examples:: index_example_01.c.

void elm_index_item_clear ( Elm_Index * obj )

Removes all items from a given index widget.

If deletion callbacks are set, via elm_object_item_del_cb_set(), that callback function will be called for each item in obj.

Parameters:

[in] obj The object.

Since :: 2.3

Examples:: index_example_01.c.

Elm_Widget_Item* elm_index_item_find	(	Elm_Index *	obj,
		const void *	data
	)

Find a given index widget's item, using item data.

Parameters:

[in]	obj	The object.
[in]	data	The item data pointed to by the desired index item

Returns:: The index item handle, if found, or NULL otherwise

Since :: 2.3

Examples:: index_example_01.c.

Elm_Widget_Item* elm_index_item_insert_after	(	Elm_Index *	obj,
		Elm_Widget_Item *	after,
		const char *	letter,
		Evas_Smart_Cb	func,
		const void *	data
	)

Insert a new item into the index object after item after.

Despite the most common usage of the letter argument is for single char strings, one could use arbitrary strings as index entries.

item will be the pointer returned back on $"changed", "delay,changed" and $"selected" smart events.

Note:: If after is NULL this function will behave as elm_index_item_append().

Parameters:

[in]	obj	The object.
[in]	after	The index item to insert after.
[in]	letter	Letter under which the item should be indexed
[in]	func	The function to call when the item is clicked.
[in]	data	The item data to set for the index's item

Returns:: A handle to the item added or NULL, on errors

Since :: 2.3

Elm_Widget_Item* elm_index_item_insert_before	(	Elm_Index *	obj,
		Elm_Widget_Item *	before,
		const char *	letter,
		Evas_Smart_Cb	func,
		const void *	data
	)

Insert a new item into the index object before item before.

Despite the most common usage of the letter argument is for single char strings, one could use arbitrary strings as index entries.

item will be the pointer returned back on $"changed", "delay,changed" and $"selected" smart events.

Note:: If before is NULL this function will behave as elm_index_item_prepend().

Parameters:

[in]	obj	The object.
[in]	before	The index item to insert after.
[in]	letter	Letter under which the item should be indexed
[in]	func	The function to call when the item is clicked.
[in]	data	The item data to set for the index's item

Returns:: A handle to the item added or NULL, on errors

Since :: 2.3

int elm_index_item_level_get ( const Elm_Index * obj )

Set the items level for a given index widget.

See: elm_index_item_level_get()

Parameters:

[in] obj The object.

Returns:: $0 or $1, the currently implemented levels.

Since :: 2.3

void elm_index_item_level_set	(	Elm_Index *	obj,
		int	level
	)

Set the items level for a given index widget.

See: elm_index_item_level_get()

Parameters:

[in]	obj	The object.
[in]	level	$0 or $1, the currently implemented levels.

Since :: 2.3

Elm_Widget_Item* elm_index_item_prepend	(	Elm_Index *	obj,
		const char *	letter,
		Evas_Smart_Cb	func,
		const void *	data
	)

Prepend a new item on a given index widget.

Despite the most common usage of the letter argument is for single char strings, one could use arbitrary strings as index entries.

item will be the pointer returned back on $"changed", "delay,changed" and $"selected" smart events.

Parameters:

[in]	obj	The object.
[in]	letter	Letter under which the item should be indexed
[in]	func	The function to call when the item is selected.
[in]	data	The item data to set for the index's item

Returns:: A handle to the item added or NULL, on errors

Since :: 2.3

Elm_Widget_Item* elm_index_item_sorted_insert	(	Elm_Index *	obj,
		const char *	letter,
		Evas_Smart_Cb	func,
		const void *	data,
		Eina_Compare_Cb	cmp_func,
		Eina_Compare_Cb	cmp_data_func
	)

Insert a new item into the given index widget, using cmp_func function to sort items (by item handles).

Despite the most common usage of the letter argument is for single char strings, one could use arbitrary strings as index entries.

item will be the pointer returned back on $"changed", "delay,changed" and $"selected" smart events.

Parameters:

[in]	obj	The object.
[in]	letter	Letter under which the item should be indexed
[in]	func	The function to call when the item is clicked.
[in]	data	The item data to set for the index's item
[in]	cmp_func	The comparing function to be used to sort index items by index item handles
[in]	cmp_data_func	A fallback function to be called for the sorting of index items by item data). It will be used when `cmp_func` returns $0 (equality), which means an index item with provided item data already exists. To decide which data item should be pointed to by the index item in question, `cmp_data_func` will be used. If `cmp_data_func` returns a non-negative value, the previous index item data will be replaced by the given `item` pointer. If the previous data need to be freed, it should be done by the `cmp_data_func` function, because all references to it will be lost. If this function is not provided ($NULL is given), index items will be duplicated, if `cmp_func` returns $0.

Returns:: A handle to the item added or NULL, on errors

Since :: 2.3

Examples:: index_example_02.c.

void elm_index_level_go	(	Elm_Index *	obj,
		int	level
	)

Flush the changes made to the index items so they work correctly.

This flushes any changes made to items indicating the object is ready to go. You should call this before any changes you expect to work. This is similar to elm_list_go().

Warning:: If not called, it won't display the index properly.

Parameters:

[in]	obj	The object.
[in]	level	The index level (one of $0 or $1) where changes were made

Since :: 2.3

Examples:: index_example_01.c, and index_example_02.c.

Eina_Bool elm_index_omit_enabled_get ( const Elm_Index * obj )

Enable or disable omit feature for a given index widget.

Parameters:

[in] obj The object.

Returns:: true to enable omit feature, false to disable

Since (EFL) :: 1.8

Since :: 2.3

void elm_index_omit_enabled_set	(	Elm_Index *	obj,
		Eina_Bool	enabled
	)

Enable or disable omit feature for a given index widget.

Parameters:

[in]	obj	The object.
[in]	enabled	`true` to enable omit feature, `false` to disable

Since (EFL) :: 1.8

Since :: 2.3

Elm_Widget_Item* elm_index_selected_item_get	(	const Elm_Index *	obj,
		int	level
	)

Returns the last selected item, for a given index widget.

Parameters:

[in]	obj	The object.
[in]	level	$0 or $1, the currently implemented levels.

Returns:: The last item selected on obj (or NULL, on errors).

Since :: 2.3

Examples:: index_example_01.c.

int elm_index_standard_priority_get ( const Elm_Index * obj )

Control standard_priority group of index. Priority group will be shown as many items as it can, and other group will be shown one character only.

Parameters:

[in] obj The object.

Returns:: priority target priority value in index

Since (EFL) :: 1.16

Since :: 3.0

void elm_index_standard_priority_set	(	Elm_Index *	obj,
		int	priority
	)

Control standard_priority group of index. Priority group will be shown as many items as it can, and other group will be shown one character only.

Parameters:

[in]	obj	The object.
[in]	priority	`priority` target priority value in index

Since (EFL) :: 1.16

Since :: 3.0

Functions

Function Documentation