Class

PhocGestureZoom

since: 0

Description [src] 

class Phoc.GestureZoom : Phoc.Gesture
{
  /* No available fields */
}

A zoom gesture

PhocGestureZoom is a PhocGesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the PhocGestureZoom::scale-changed signal is emitted to report the scale factor.

Available since: 0

Ancestors

Constructors

phoc_gesture_zoom_new

Returns a newly created PhocGesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

since: 0

Instance methods

phoc_gesture_zoom_get_scale_delta

If gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If gesture is not active, 1 is returned.

since: 0

Methods inherited from PhocGesture (14)
phoc_gesture_get_last_event

Returns the last event that was processed for sequence.

since: 0

phoc_gesture_get_last_update_time
No description available.

since: 0

phoc_gesture_get_point

If sequence is currently being interpreted by gesture, returns TRUE and fills in x and y with the last coordinates stored for that event sequence.

since: 0

phoc_gesture_get_sequence_state

Returns the sequence state, as seen by gesture.

since: 0

phoc_gesture_get_sequences

Returns the list of PhocEventSequences currently being interpreted by PhocGesture.

since: 0

phoc_gesture_group
No description available.

since: 0

phoc_gesture_handle_event

Handle the given event.

since: 0

phoc_gesture_handles_sequence

Returns TRUE if gesture is currently handling events corresponding to sequence.

unstable since: 3.14

phoc_gesture_is_active

Returns TRUE if the gesture is currently active. A gesture is active meanwhile there are touch sequences interacting with it.

unstable since: 3.14

phoc_gesture_is_recognized

Returns TRUE if the gesture is currently recognized. A gesture is recognized if there are as many interacting touch sequences as required by self, and PhocGesture::check returned TRUE for the sequences being currently interpreted.

since: 0

phoc_gesture_reset

Resets the gesture to a clean state.

since: 0

phoc_gesture_set_sequence_state

Sets the state of sequence in self. Sequences start in state #PHOC_EVENT_SEQUENCE_NONE, and whenever they change state, they can never go back to that state. Likewise, sequences in state #PHOC_EVENT_SEQUENCE_DENIED cannot turn back to a not denied state. With these rules, the lifetime of an event sequence is constrained to the next four:

since: 0

phoc_gesture_set_state
No description available.

since: 0

phoc_gesture_ungroup

Separates self into an isolated group.

since: 0

Methods inherited from GObject (43)

Please see GObject for a full list of methods.

Properties

Properties inherited from PhocGesture (1)
Phoc.Gesture:n-points

The number of touch points that trigger recognition on this gesture.

since: 0

Signals

Phoc.GestureZoom::scale-changed

This signal is emitted whenever the distance between both tracked sequences changes.

since: 0

Signals inherited from PhocGesture (5)
PhocGesture::begin

Emitted when the gesture is recognized.

since: 0

PhocGesture::cancel

Emitted whenever a sequence is cancelled.

since: 0

PhocGesture::end

Emitted when gesture stopped recognizing the event sequences as something to be handled.

since: 0

PhocGesture::sequence-state-changed

This signal is emitted whenever a sequence state changes. See phoc_gesture_set_sequence_state() to know more about the expectable sequence lifetimes.

since: 0

PhocGesture::update

Emitted whenever an event is handled while the gesture is recognized.

since: 0

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.

unstable since: 2.0

Class structure 

struct PhocGestureZoomClass {
  PhocGestureClass parent_class;
  void (* scale_changed) (
    PhocGestureZoom* self,
    gdouble scale
  );
  
}
No description available.
Class members
parent_class: PhocGestureClass
No description available.
scale_changed: void (* scale_changed) ( PhocGestureZoom* self, gdouble scale )
No description available.

Virtual methods

Phoc.GestureZoomClass.scale_changed
No description available.

since: 0