Class

ClutterGestureAction

Description [src]

class Clutter.GestureAction : Clutter.Action
{
  /* No available fields */
}

Action for gesture gestures

ClutterGestureAction is a sub-class of ClutterAction that implements the logic for recognizing gesture gestures. It listens for low level ClutterEvent events on the stage to raise the ClutterGestureAction::gesture-begin, ClutterGestureAction::gesture-progress, and ClutterGestureAction::gesture-end signals.

To use ClutterGestureAction you just need to apply it to a ClutterActor using clutter_actor_add_action() and connect to the signals:

  ClutterAction *action = clutter_gesture_action_new ();

  clutter_actor_add_action (actor, action);

  g_signal_connect (action, "gesture-begin", G_CALLBACK (on_gesture_begin), NULL);
  g_signal_connect (action, "gesture-progress", G_CALLBACK (on_gesture_progress), NULL);
  g_signal_connect (action, "gesture-end", G_CALLBACK (on_gesture_end), NULL);

Creating Gesture actions

A ClutterGestureAction provides four separate states that can be used to recognize or ignore gestures when writing a new action class:

  • Prepare -> Cancel
  • Prepare -> Begin -> Cancel
  • Prepare -> Begin -> End
  • Prepare -> Begin -> Progress -> Cancel
  • Prepare -> Begin -> Progress -> End

Each ClutterGestureAction starts in the “prepare” state, and calls the Clutter.GestureActionClass.gesture_prepare virtual function; this state can be used to reset the internal state of a ClutterGestureAction subclass, but it can also immediately cancel a gesture without going through the rest of the states.

The “begin” state follows the “prepare” state, and calls the Clutter.GestureActionClass.gesture_begin virtual function. This state signals the start of a gesture recognizing process. From the “begin” state the gesture recognition process can successfully end, by going to the “end” state; it can continue in the “progress” state, in case of a continuous gesture; or it can be terminated, by moving to the “cancel” state.

In case of continuous gestures, the ClutterGestureAction will use the “progress” state, calling the Clutter.GestureActionClass.gesture_progress virtual function; the “progress” state will continue until the end of the gesture, in which case the “end” state will be reached, or until the gesture is cancelled, in which case the “cancel” gesture will be used instead.

Hierarchy

hierarchy this ClutterGestureAction ancestor_0 ClutterAction ancestor_0--this ancestor_1 ClutterActorMeta ancestor_1--ancestor_0 ancestor_2 GInitiallyUnowned ancestor_2--ancestor_1 ancestor_3 GObject ancestor_3--ancestor_2

Constructors

clutter_gesture_action_new

Creates a new ClutterGestureAction instance.

Instance methods

clutter_gesture_action_cancel

Cancel a ClutterGestureAction before it begins.

clutter_gesture_action_get_device

Retrieves the ClutterInputDevice of a touch point.

clutter_gesture_action_get_last_event

Retrieves a reference to the last ClutterEvent for a touch point. Call clutter_event_copy() if you need to store the reference somewhere.

clutter_gesture_action_get_motion_coords

Retrieves the coordinates, in stage space, of the latest motion event during the dragging.

clutter_gesture_action_get_motion_delta

Retrieves the incremental delta since the last motion event during the dragging.

clutter_gesture_action_get_n_current_points

Retrieves the number of points currently active.

clutter_gesture_action_get_n_touch_points

Retrieves the number of requested points to trigger the gesture.

clutter_gesture_action_get_press_coords

Retrieves the coordinates, in stage space, of the press event that started the dragging for a specific touch point.

clutter_gesture_action_get_release_coords

Retrieves the coordinates, in stage space, where the touch point was last released.

clutter_gesture_action_get_sequence

Retrieves the ClutterEventSequence of a touch point.

clutter_gesture_action_get_threshold_trigger_distance

Retrieves the threshold trigger distance of the gesture action, as set using clutter_gesture_action_set_threshold_trigger_distance().

clutter_gesture_action_get_threshold_trigger_edge

Retrieves the edge trigger of the gesture action, as set using clutter_gesture_action_set_threshold_trigger_edge().

clutter_gesture_action_get_velocity

Retrieves the velocity, in stage pixels per millisecond, of the latest motion event during the dragging.

clutter_gesture_action_set_n_touch_points

Sets the number of points needed to trigger the gesture.

clutter_gesture_action_set_threshold_trigger_distance

Sets the threshold trigger distance for the gesture drag threshold, if any.

clutter_gesture_action_set_threshold_trigger_edge

Sets the edge trigger for the gesture drag threshold, if any.

Methods inherited from ClutterAction (1)
clutter_action_get_phase
No description available.

Methods inherited from ClutterActorMeta (5)
clutter_actor_meta_get_actor

Retrieves a pointer to the ClutterActor that owns meta.

clutter_actor_meta_get_enabled

Retrieves whether meta is enabled.

clutter_actor_meta_get_name

Retrieves the name set using clutter_actor_meta_set_name()

clutter_actor_meta_set_enabled

Sets whether meta should be enabled or not.

clutter_actor_meta_set_name

Sets the name of meta.

Methods inherited from GObject (43)

Please see GObject for a full list of methods.

Properties

Clutter.GestureAction:n-touch-points

Number of touch points to trigger a gesture action.

Clutter.GestureAction:threshold-trigger-distance-x

The horizontal trigger distance to be used by the action to either emit the ClutterGestureAction::gesture-begin signal or to emit the ClutterGestureAction::gesture-cancel signal.

Clutter.GestureAction:threshold-trigger-distance-y

The vertical trigger distance to be used by the action to either emit the ClutterGestureAction::gesture-begin signal or to emit the ClutterGestureAction::gesture-cancel signal.

Clutter.GestureAction:threshold-trigger-edge

The trigger edge to be used by the action to either emit the ClutterGestureAction::gesture-begin signal or to emit the ClutterGestureAction::gesture-cancel signal.

Properties inherited from ClutterActorMeta (3)
Clutter.ActorMeta:actor

The ClutterActor attached to the ClutterActorMeta instance.

Clutter.ActorMeta:enabled

Whether or not the ClutterActorMeta is enabled.

Clutter.ActorMeta:name

The unique name to access the ClutterActorMeta.

Signals

Clutter.GestureAction::gesture-begin

The signal is emitted when the ClutterActor to which a ClutterGestureAction has been applied starts receiving a gesture.

Clutter.GestureAction::gesture-cancel

The signal is emitted when the ongoing gesture gets cancelled from the ClutterGestureAction::gesture-progress signal handler.

Clutter.GestureAction::gesture-end

The signal is emitted at the end of the gesture gesture, when the pointer’s button is released.

Clutter.GestureAction::gesture-progress

The signal is emitted for each motion event after the ClutterGestureAction::gesture-begin signal has been emitted.

Signals inherited from GObject (1)
GObject::notify

The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.

Class structure

struct ClutterGestureActionClass {
  gboolean (* gesture_begin) (
    ClutterGestureAction* action,
    ClutterActor* actor
  );
  gboolean (* gesture_progress) (
    ClutterGestureAction* action,
    ClutterActor* actor
  );
  void (* gesture_end) (
    ClutterGestureAction* action,
    ClutterActor* actor
  );
  void (* gesture_cancel) (
    ClutterGestureAction* action,
    ClutterActor* actor
  );
  gboolean (* gesture_prepare) (
    ClutterGestureAction* action,
    ClutterActor* actor
  );
  
}

The ClutterGestureClass structure contains only private data.

Class members
gesture_begin: gboolean (* gesture_begin) ( ClutterGestureAction* action, ClutterActor* actor )

No description available.

gesture_progress: gboolean (* gesture_progress) ( ClutterGestureAction* action, ClutterActor* actor )

No description available.

gesture_end: void (* gesture_end) ( ClutterGestureAction* action, ClutterActor* actor )

No description available.

gesture_cancel: void (* gesture_cancel) ( ClutterGestureAction* action, ClutterActor* actor )

No description available.

gesture_prepare: gboolean (* gesture_prepare) ( ClutterGestureAction* action, ClutterActor* actor )

No description available.

Virtual methods

Clutter.GestureActionClass.gesture_begin
No description available.

Clutter.GestureActionClass.gesture_cancel
No description available.

Clutter.GestureActionClass.gesture_end
No description available.

Clutter.GestureActionClass.gesture_prepare
No description available.