Gesture Layer

---

Gesture Layer Usage:

Use Gesture Layer to detect gestures. The advantage is that you don't have to implement gesture detection, just set callbacks of gesture state. By using gesture layer we make standard interface.

In order to use Gesture Layer you start with elm_gesture_layer_add with a parent object parameter. Next 'activate' gesture layer with a elm_gesture_layer_attach call. Usually with same object as target (2nd parameter).

Now you need to tell gesture layer what gestures you follow. This is done with elm_gesture_layer_cb_set call. By setting the callback you actually saying to gesture layer: I would like to know when the gesture Elm_Gesture_Type switches to state Elm_Gesture_State.

Next, you need to implement the actual action that follows the input in your callback.

Note that if you like to stop being reported about a gesture, just set all callbacks referring this gesture to NULL. (again with elm_gesture_layer_cb_set)

The information reported by gesture layer to your callback is depending on Elm_Gesture_Type : Elm_Gesture_Taps_Info is the info reported for tap gestures: ELM_GESTURE_N_TAPS, ELM_GESTURE_N_LONG_TAPS, ELM_GESTURE_N_DOUBLE_TAPS, ELM_GESTURE_N_TRIPLE_TAPS.

Elm_Gesture_Momentum_Info is info reported for momentum gestures: ELM_GESTURE_MOMENTUM.

Elm_Gesture_Line_Info is the info reported for line gestures: (this also contains Elm_Gesture_Momentum_Info internal structure) ELM_GESTURE_N_LINES, ELM_GESTURE_N_FLICKS. Note that we consider a flick as a line-gesture that should be completed in flick-time-limit as defined in Config.

Elm_Gesture_Zoom_Info is the info reported for ELM_GESTURE_ZOOM gesture.

Elm_Gesture_Rotate_Info is the info reported for ELM_GESTURE_ROTATE gesture.

Gesture Layer Tweaks:

Note that line, flick, gestures can start without the need to remove fingers from surface. When user fingers rests on same-spot gesture is ended and starts again when fingers moved.

Setting glayer_continues_enable to false in Config will change this behavior so gesture starts when user touches (a *DOWN event) touch-surface and ends when no fingers touches surface (a *UP event).

Supported elm_object common APIs.

• elm_object_disabled_set
• elm_object_disabled_get

Functions
double	elm_config_glayer_long_tap_start_timeout_get (void)
void	elm_config_glayer_long_tap_start_timeout_set (double long_tap_timeout)
double	elm_config_glayer_double_tap_timeout_get (void)
void	elm_config_glayer_double_tap_timeout_set (double double_tap_timeout)
void	elm_gesture_layer_line_min_length_set (Evas_Object *obj, int line_min_length)
int	elm_gesture_layer_line_min_length_get (const Evas_Object *obj)
void	elm_gesture_layer_zoom_distance_tolerance_set (Evas_Object *obj, Evas_Coord zoom_distance_tolerance)
Evas_Coord	elm_gesture_layer_zoom_distance_tolerance_get (const Evas_Object *obj)
void	elm_gesture_layer_line_distance_tolerance_set (Evas_Object *obj, Evas_Coord line_distance_tolerance)
Evas_Coord	elm_gesture_layer_line_distance_tolerance_get (const Evas_Object *obj)
void	elm_gesture_layer_line_angular_tolerance_set (Evas_Object *obj, double line_angular_tolerance)
double	elm_gesture_layer_line_angular_tolerance_get (const Evas_Object *obj)
void	elm_gesture_layer_zoom_wheel_factor_set (Evas_Object *obj, double zoom_wheel_factor)
double	elm_gesture_layer_zoom_wheel_factor_get (const Evas_Object *obj)
void	elm_gesture_layer_zoom_finger_factor_set (Evas_Object *obj, double zoom_finger_factor)
double	elm_gesture_layer_zoom_finger_factor_get (const Evas_Object *obj)
void	elm_gesture_layer_rotate_angular_tolerance_set (Evas_Object *obj, double rotate_angular_tolerance)
double	elm_gesture_layer_rotate_angular_tolerance_get (const Evas_Object *obj)
void	elm_gesture_layer_flick_time_limit_ms_set (Evas_Object *obj, unsigned int flick_time_limit_ms)
unsigned int	elm_gesture_layer_flick_time_limit_ms_get (const Evas_Object *obj)
void	elm_gesture_layer_long_tap_start_timeout_set (Evas_Object *obj, double long_tap_start_timeout)
double	elm_gesture_layer_long_tap_start_timeout_get (const Evas_Object *obj)
void	elm_gesture_layer_continues_enable_set (Evas_Object *obj, Eina_Bool continues_enable)
Eina_Bool	elm_gesture_layer_continues_enable_get (const Evas_Object *obj)
void	elm_gesture_layer_double_tap_timeout_set (Evas_Object *obj, double double_tap_timeout)
double	elm_gesture_layer_double_tap_timeout_get (const Evas_Object *obj)
void	elm_gesture_layer_tap_finger_size_set (Evas_Object *obj, Evas_Coord sz)
Evas_Coord	elm_gesture_layer_tap_finger_size_get (const Evas_Object *obj)
Evas_Object *	elm_gesture_layer_add (Evas_Object *parent)
void	elm_gesture_layer_tap_longpress_cb_add (Evas_Object *obj, Elm_Gesture_State state, Elm_Gesture_Event_Cb cb, void *data)
void	elm_gesture_layer_tap_longpress_cb_del (Evas_Object *obj, Elm_Gesture_State state, Elm_Gesture_Event_Cb cb, void *data)
Typedefs
typedef struct _Elm_Gesture_Taps_Info	Elm_Gesture_Taps_Info
typedef struct _Elm_Gesture_Momentum_Info	Elm_Gesture_Momentum_Info
typedef struct _Elm_Gesture_Line_Info	Elm_Gesture_Line_Info
typedef struct _Elm_Gesture_Zoom_Info	Elm_Gesture_Zoom_Info
typedef struct _Elm_Gesture_Rotate_Info	Elm_Gesture_Rotate_Info
typedef Evas_Event_Flags(*	Elm_Gesture_Event_Cb )(void *data, void *event_info)

---

Typedef Documentation

typedef Evas_Event_Flags(* Elm_Gesture_Event_Cb)(void *data, void *event_info)

User callback used to stream gesture info from gesture layer

Parameters:

data	user data
event_info	gesture report info Returns a flag field to be applied on the causing event. You should probably return EVAS_EVENT_FLAG_ON_HOLD if your widget acted upon the event, in an irreversible way.

typedef struct _Elm_Gesture_Line_Info Elm_Gesture_Line_Info

Holds line info for user

typedef struct _Elm_Gesture_Momentum_Info Elm_Gesture_Momentum_Info

holds momentum info for user

typedef struct _Elm_Gesture_Rotate_Info Elm_Gesture_Rotate_Info

Holds rotation info for user

typedef struct _Elm_Gesture_Taps_Info Elm_Gesture_Taps_Info

Holds taps info for user

typedef struct _Elm_Gesture_Zoom_Info Elm_Gesture_Zoom_Info

Holds zoom info for user

---

Function Documentation

double elm_config_glayer_double_tap_timeout_get

(

void

)

Get the duration for occurring double tap event of gesture layer.

Returns:

Timeout for double tap event of gesture layer.

Since (EFL) :

1.8

Since :

2.3

void elm_config_glayer_double_tap_timeout_set

(

double

double_tap_timeout

)

Set the duration for occurring double tap event of gesture layer.

Parameters:

double_tap_timeout

Timeout for double tap event of gesture layer.

Since (EFL) :

1.8

Since :

2.3

double elm_config_glayer_long_tap_start_timeout_get

(

void

)

Get the duration for occurring long tap event of gesture layer.

Returns:

Timeout for long tap event of gesture layer.

Since (EFL) :

1.8

Since :

2.3

void elm_config_glayer_long_tap_start_timeout_set

(

double

long_tap_timeout

)

Set the duration for occurring long tap event of gesture layer.

Parameters:

long_tap_timeout

Timeout for long tap event of gesture layer.

Since (EFL) :

1.8

Since :

2.3

Evas_Object* elm_gesture_layer_add

(

Evas_Object *

parent

)

Call this function to construct a new gesture-layer object.

Parameters:

parent

The gesture layer's parent widget.

Returns:

A new gesture layer object.

This does not activate the gesture layer. You have to call elm_gesture_layer_attach() in order to 'activate' gesture-layer.

Since :

2.3

Eina_Bool elm_gesture_layer_continues_enable_get

(

const Evas_Object *

obj

)

This function returns the gesture layer continues enable of an object

Parameters:

obj	gesture-layer.

Returns:

continues enable

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_continues_enable_set	(	Evas_Object *	obj,
		Eina_Bool	continues_enable
	)

This function sets the gesture layer continues enable of an object

An option that allows user to start a gesture even when user is in touch move state.

Parameters:

obj	gesture-layer.
continues_enable	continues enable

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_double_tap_timeout_get

(

const Evas_Object *

obj

)

this function returns the gesture layer double tap timeout of an object

Parameters:

obj	gesture-layer.

Returns:

double tap timeout

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_double_tap_timeout_set	(	Evas_Object *	obj,
		double	double_tap_timeout
	)

This function sets the gesture layer double tap timeout of an object

When the time difference between two tabs is less than the double_tap_timeout value, it is recognized as a double tab, if set negative value, timeout will be 0.

Parameters:

obj	gesture-layer.
double_tap_timeout	double tap timeout

Since (EFL) :

1.8

Since :

2.3

unsigned int elm_gesture_layer_flick_time_limit_ms_get

(

const Evas_Object *

obj

)

This function returns the gesture layer flick time limit (in ms) of an object

Parameters:

obj	gesture-layer.

Returns:

flick time limit (in ms)

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_flick_time_limit_ms_set	(	Evas_Object *	obj,
		unsigned int	flick_time_limit_ms
	)

This function sets the gesture layer flick time limit (in ms) of an object

Recognize as a flick when a gesture occurs over flick_time_limit_ms.

Parameters:

obj	gesture-layer.
flick_time_limit_ms	flick time limit (in ms)

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_line_angular_tolerance_get

(

const Evas_Object *

obj

)

This function returns the gesture layer line angular tolerance of an object

Parameters:

obj	gesture-layer.

Returns:

line angular tolerance

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_line_angular_tolerance_set	(	Evas_Object *	obj,
		double	line_angular_tolerance
	)

This function sets the gesture layer line angular tolerance of an object

Sets the minimum line_angular_tolerance angle for the gesture to be recognized as a line.

Parameters:

obj	gesture-layer.
line_angular_tolerance	line angular tolerance

Since (EFL) :

1.8

Since :

2.3

Evas_Coord elm_gesture_layer_line_distance_tolerance_get

(

const Evas_Object *

obj

)

This function returns the gesture layer line distance tolerance of an object

Parameters:

obj	gesture-layer.

Returns:

line distance tolerance

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_line_distance_tolerance_set	(	Evas_Object *	obj,
		Evas_Coord	line_distance_tolerance
	)

This function sets the gesture layer line distance tolerance of an object

Sets the minimum line_distance_tolerance length for the gesture to be recognized as a line.

Parameters:

obj	gesture-layer.
line_distance_tolerance	line distance tolerance

Since (EFL) :

1.8

Since :

2.3

int elm_gesture_layer_line_min_length_get

(

const Evas_Object *

obj

)

This function returns the gesture layer line min length of an object

Parameters:

obj	gesture-layer.

Returns:

the length.

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_line_min_length_set	(	Evas_Object *	obj,
		int	line_min_length
	)

This function sets the gesture layer line min length of an object

Sets the minimum line length at which the user's gesture will be recognized as a line.

Parameters:

obj	gesture-layer.
line_min_length	the length.

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_long_tap_start_timeout_get

(

const Evas_Object *

obj

)

this function returns the gesture layer long tap start timeout of an object

Parameters:

obj	gesture-layer.

Returns:

long tap start timeout

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_long_tap_start_timeout_set	(	Evas_Object *	obj,
		double	long_tap_start_timeout
	)

This function sets the gesture layer long tap start timeout of an object

Recognize as a long tap when a tab occurs over long_tap_start_timeout, if set negative value, timeout will be 0.

Parameters:

obj	gesture-layer.
long_tap_start_timeout	long tap start timeout

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_rotate_angular_tolerance_get

(

const Evas_Object *

obj

)

This function returns the gesture layer rotate angular tolerance of an object

Parameters:

obj	gesture-layer.

Returns:

rotate angular tolerance

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_rotate_angular_tolerance_set	(	Evas_Object *	obj,
		double	rotate_angular_tolerance
	)

This function sets the gesture layer rotate angular tolerance of an object

Sets the minimum rotate_angular_tolerance angle for the gesture to be recognized as a rotate. Rotate should be rotated beyond the givin rotate_angular_tolerance to recognize the start of the rotate gesture.

Parameters:

obj	gesture-layer.
rotate_angular_tolerance	rotate angular tolerance

Since (EFL) :

1.8

Since :

2.3

Evas_Coord elm_gesture_layer_tap_finger_size_get

(

const Evas_Object *

obj

)

This function returns the gesture layer finger-size for taps

Parameters:

obj	gesture-layer.

Returns:

Finger size that is currently used by Gesture Layer for taps.

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_tap_finger_size_set	(	Evas_Object *	obj,
		Evas_Coord	sz
	)

This function sets the gesture layer finger-size for taps If not set, this size taken from elm_config. Set to ZERO if you want GLayer to use system finger size value (default)

Parameters:

obj	gesture-layer.
sz	Finger size

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_tap_longpress_cb_add	(	Evas_Object *	obj,
		Elm_Gesture_State	state,
		Elm_Gesture_Event_Cb	cb,
		void *	data
	)

This function adds a callback called during Tap + Long Tap sequence.

Parameters:

state	state for the callback to add.
cb	callback pointer
data	user data for the callback.

The callbacks will be called as followed:

• start cbs on single tap start
• move cbs on long press move
• end cbs on long press end
• abort cbs whenever in the sequence. The event info will be NULL, because it can be triggered from multiple events (timer expired, abort single/long taps).

You can remove the callbacks by using elm_gesture_layer_tap_longpress_cb_del.

See also:

elm_gesture_layer_tap_longpress_cb_del

Since (EFL) :

1.8

Since :

3.0f(2.3.1)

void elm_gesture_layer_tap_longpress_cb_del	(	Evas_Object *	obj,
		Elm_Gesture_State	state,
		Elm_Gesture_Event_Cb	cb,
		void *	data
	)

This function removes a callback called during Tap + Long Tap sequence.

Parameters:

state	state for the callback to add.
cb	callback pointer
data	user data for the callback.

The internal data used for the sequence will be freed ONLY when all the callbacks added via elm_gesture_layer_tap_longpress_cb_add are removed by this function.

See also:

elm_gesture_layer_tap_longpress_cb_add

Since (EFL) :

1.8

Since :

3.0f(2.3.1)

Evas_Coord elm_gesture_layer_zoom_distance_tolerance_get

(

const Evas_Object *

obj

)

This function returns the gesture layer zoom distance tolerance of an object

Parameters:

obj	gesture-layer.

Returns:

zoom distance tolerance

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_zoom_distance_tolerance_set	(	Evas_Object *	obj,
		Evas_Coord	zoom_distance_tolerance
	)

This function sets the gesture layer zoom distance tolerance of an object

If the distance between the two tab events becomes larger or smaller than zoom_distance_tolerance, it is recognized as the start of the zoom gesture.

Parameters:

obj	gesture-layer.
zoom_distance_tolerance	zoom distance tolerance

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_zoom_finger_factor_get

(

const Evas_Object *

obj

)

This function returns the gesture layer zoom finger factor of an object

Parameters:

obj	gesture-layer.

Returns:

zoom finger factor

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_zoom_finger_factor_set	(	Evas_Object *	obj,
		double	zoom_finger_factor
	)

This function sets the gesture layer zoom finger factor of an object

Sets the zoom size by multiplaying the zoom value by zoom_finger_factor when zooming.

Parameters:

obj	gesture-layer.
zoom_finger_factor	zoom finger factor

Since (EFL) :

1.8

Since :

2.3

double elm_gesture_layer_zoom_wheel_factor_get

(

const Evas_Object *

obj

)

This function returns the gesture layer zoom wheel factor of an object

Parameters:

obj	gesture-layer.

Returns:

zoom wheel factor

Since (EFL) :

1.8

Since :

2.3

void elm_gesture_layer_zoom_wheel_factor_set	(	Evas_Object *	obj,
		double	zoom_wheel_factor
	)

This function sets the gesture layer zoom wheel factor of an object

Sets the zoom size when a mouse wheel event occurs.

Parameters:

obj	gesture-layer.
zoom_wheel_factor	zoom wheel factor

Since (EFL) :

1.8

Since :

2.3