Tizen Native API  5.5
Gesture Layer

gesture_layer_inheritance_tree.png

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.

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)
void elm_gesture_layer_zoom_step_set (Elm_Gesture_Layer *obj, double step)
 Control step value for zoom action.
double elm_gesture_layer_zoom_step_get (const Elm_Gesture_Layer *obj)
 Control step value for zoom action.
void elm_gesture_layer_tap_finger_size_set (Elm_Gesture_Layer *obj, int sz)
 This function sets the gesture layer finger-size for taps.
int elm_gesture_layer_tap_finger_size_get (const Elm_Gesture_Layer *obj)
 This function returns the gesture layer finger-size for taps.
void elm_gesture_layer_hold_events_set (Elm_Gesture_Layer *obj, Eina_Bool hold_events)
 This function makes gesture-layer repeat events.
Eina_Bool elm_gesture_layer_hold_events_get (const Elm_Gesture_Layer *obj)
 Get the repeat-events setting.
void elm_gesture_layer_rotate_step_set (Elm_Gesture_Layer *obj, double step)
 This function returns step-value for rotate action.
double elm_gesture_layer_rotate_step_get (const Elm_Gesture_Layer *obj)
 This function returns step-value for rotate action.
void elm_gesture_layer_cb_set (Elm_Gesture_Layer *obj, Elm_Gesture_Type idx, Elm_Gesture_State cb_type, Elm_Gesture_Event_Cb cb, void *data)
 Set the gesture state change callback.
Eina_Bool elm_gesture_layer_attach (Elm_Gesture_Layer *obj, Efl_Canvas_Object *target)
 Attach a gesture layer widget to an Evas object (setting the widget's target).
void elm_gesture_layer_cb_del (Elm_Gesture_Layer *obj, Elm_Gesture_Type idx, Elm_Gesture_State cb_type, Elm_Gesture_Event_Cb cb, void *data)
 Remove a gesture callback.
void elm_gesture_layer_cb_add (Elm_Gesture_Layer *obj, Elm_Gesture_Type idx, Elm_Gesture_State cb_type, Elm_Gesture_Event_Cb cb, void *data)
 Add a gesture state change callback.
Evas_Objectelm_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:
datauser data
event_infogesture 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.

Holds line info for user

holds momentum info for user

Holds rotation info for user

Holds taps info for user

Holds zoom info for user


Function Documentation

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 :
2.3.1
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_timeoutTimeout for double tap event of gesture layer.
Since (EFL) :
1.8
Since :
2.3.1

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 :
2.3.1
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_timeoutTimeout for long tap event of gesture layer.
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
parentThe 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 :
2.3.1
Eina_Bool elm_gesture_layer_attach ( Elm_Gesture_Layer *  obj,
Efl_Canvas_Object target 
)

Attach a gesture layer widget to an Evas object (setting the widget's target).

A gesture layer's target may be any Evas object. This object will be used to listen to mouse and key events.

Parameters:
[in]objThe object.
[in]targetThe object to attach.
Returns:
true on success, false otherwise.
Since :
2.3.1
void elm_gesture_layer_cb_add ( Elm_Gesture_Layer *  obj,
Elm_Gesture_Type  idx,
Elm_Gesture_State  cb_type,
Elm_Gesture_Event_Cb  cb,
void *  data 
)

Add a gesture state change callback.

When all callbacks for the gesture are set to null, it means this gesture is disabled.

If a function was already set for this gesture/type/state, it will be replaced by the new one. For ABI compat, callbacks added by elm_gesture_layer_cb_add will be removed. It is recommended to use only one of these functions for a gesture object.

Parameters:
[in]objThe object.
[in]idxThe gesture you want to track state of.
[in]cb_typeThe event the callback tracks (START, MOVE, END, ABORT).
[in]cbThe callback itself.
[in]dataCustom data to be passed.
Since :
3.0f(2.3.1)
void elm_gesture_layer_cb_del ( Elm_Gesture_Layer *  obj,
Elm_Gesture_Type  idx,
Elm_Gesture_State  cb_type,
Elm_Gesture_Event_Cb  cb,
void *  data 
)

Remove a gesture callback.

Parameters:
[in]objThe object.
[in]idxThe gesture you want to track state of.
[in]cb_typeThe event the callback tracks (START, MOVE, END, ABORT).
[in]cbThe callback itself.
[in]dataCustom callback data.
Since :
3.0f(2.3.1)
void elm_gesture_layer_cb_set ( Elm_Gesture_Layer *  obj,
Elm_Gesture_Type  idx,
Elm_Gesture_State  cb_type,
Elm_Gesture_Event_Cb  cb,
void *  data 
)

Set the gesture state change callback.

When all callbacks for the gesture are set to null, it means this gesture is disabled.

Parameters:
[in]objThe object.
[in]idxThe gesture you want to track state of.
[in]cb_typeThe event the callback tracks (START, MOVE, END, ABORT).
[in]cbThe callback itself.
[in]dataCustom data to be passed.
Since :
2.3.1

This function returns the gesture layer continues enable of an object

Parameters:
objgesture-layer.
Returns:
continues enable
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
continues_enablecontinues enable
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
double tap timeout
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
double_tap_timeoutdouble tap timeout
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
flick time limit (in ms)
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
flick_time_limit_msflick time limit (in ms)
Since (EFL) :
1.8
Since :
2.3.1
Eina_Bool elm_gesture_layer_hold_events_get ( const Elm_Gesture_Layer *  obj)

Get the repeat-events setting.

Parameters:
[in]objThe object.
Returns:
If true get events only if gesture was not detected, false otherwise
Since :
2.3.1
void elm_gesture_layer_hold_events_set ( Elm_Gesture_Layer *  obj,
Eina_Bool  hold_events 
)

This function makes gesture-layer repeat events.

Set this if you like to get the raw events only if gestures were not detected.

Clear this if you like gesture layer to forward events as testing gestures.

Parameters:
[in]objThe object.
[in]hold_eventsIf true get events only if gesture was not detected, false otherwise
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
line angular tolerance
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
line_angular_toleranceline angular tolerance
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
line distance tolerance
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
line_distance_toleranceline distance tolerance
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
the length.
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
line_min_lengththe length.
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
long tap start timeout
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
long_tap_start_timeoutlong tap start timeout
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
rotate angular tolerance
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
rotate_angular_tolerancerotate angular tolerance
Since (EFL) :
1.8
Since :
2.3.1
double elm_gesture_layer_rotate_step_get ( const Elm_Gesture_Layer *  obj)

This function returns step-value for rotate action.

Parameters:
[in]objThe object.
Returns:
New rotate step value.
Since :
2.3.1
void elm_gesture_layer_rotate_step_set ( Elm_Gesture_Layer *  obj,
double  step 
)

This function returns step-value for rotate action.

Set to 0 to cancel step setting.

When recognizing the rotate gesture, the rotated size must be larger than step.

Parameters:
[in]objThe object.
[in]stepNew rotate step value.
Since :
2.3.1
int elm_gesture_layer_tap_finger_size_get ( const Elm_Gesture_Layer *  obj)

This function returns the gesture layer finger-size for taps.

Parameters:
[in]objThe object.
Returns:
The finger size.
Since (EFL) :
1.8
Since :
2.3.1

This function returns the gesture layer finger-size for taps

Parameters:
objgesture-layer.
Returns:
Finger size that is currently used by Gesture Layer for taps.
Since (EFL) :
1.8
Since :
2.3.1
void elm_gesture_layer_tap_finger_size_set ( Elm_Gesture_Layer *  obj,
int  sz 
)

This function sets the gesture layer finger-size for taps.

If not set, it's taken from elm_config. Set to 0 if you want GLayer to use the system finger size value (default).

Parameters:
[in]objThe object.
[in]szThe finger size.
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
szFinger size
Since (EFL) :
1.8
Since :
2.3.1
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:
statestate for the callback to add.
cbcallback pointer
datauser 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:
statestate for the callback to add.
cbcallback pointer
datauser 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)

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

Parameters:
objgesture-layer.
Returns:
zoom distance tolerance
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
zoom_distance_tolerancezoom distance tolerance
Since (EFL) :
1.8
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
zoom finger factor
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
zoom_finger_factorzoom finger factor
Since (EFL) :
1.8
Since :
2.3.1
double elm_gesture_layer_zoom_step_get ( const Elm_Gesture_Layer *  obj)

Control step value for zoom action.

Parameters:
[in]objThe object.
Returns:
The zoom step value.
Since :
2.3.1
void elm_gesture_layer_zoom_step_set ( Elm_Gesture_Layer *  obj,
double  step 
)

Control step value for zoom action.

When recognizing the zoom gesture, it should be recognized as zooming larger than step.

Parameters:
[in]objThe object.
[in]stepThe zoom step value.
Since :
2.3.1

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

Parameters:
objgesture-layer.
Returns:
zoom wheel factor
Since (EFL) :
1.8
Since :
2.3.1
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:
objgesture-layer.
zoom_wheel_factorzoom wheel factor
Since (EFL) :
1.8
Since :
2.3.1