Gesture Events: libgrip Reference Manual

Gesture Events

Functions

GripGestureEvent *	grip_gesture_event_new ()
void	grip_gesture_event_free ()
GripGestureEvent *	grip_gesture_event_copy ()

Types and Values

enum	GripGestureType
enum	GripDeviceType
#define	GRIP_DEVICE_ALL
enum	GripTimeType
union	GripGestureEvent
struct	GripEventGestureAny
struct	GripEventGestureDrag
struct	GripEventGesturePinch
struct	GripEventGestureRotate
struct	GripEventGestureTap

Object Hierarchy

    GBoxed
    ╰── GripGestureEvent
    GEnum
    ├── GripGestureType
    ╰── GripTimeType

Description

A series of one or more events are passed to the gesture callback. Each event conveys information specific to the type of gesture occurring.

Functions

grip_gesture_event_new ()

GripGestureEvent *
grip_gesture_event_new (GripGestureType gesture_type);

Creates a new Grip gesture event.

Parameters

gesture_type

the type of the gesture

Returns

a new GripGestureEvent

grip_gesture_event_free ()

void
grip_gesture_event_free (GripGestureEvent *event);

Frees the resources allocated for a GripGestureEvent.

Parameters

event

a GripGestureEvent

grip_gesture_event_copy ()

GripGestureEvent *
grip_gesture_event_copy (const GripGestureEvent *event);

Creates a new GripGestureEvent instance using a deep copy of and existing event.

Parameters

event

an existing GripGestureEvent

Returns

a new GripGestureEvent

Types and Values

enum GripGestureType

Indicates the type of gesture for which a gesture event is being received.

Members

GRIP_GESTURE_DRAG	a drag gesture
GRIP_GESTURE_PINCH	a pinch/expand gesture
GRIP_GESTURE_ROTATE	a rotate gesture
GRIP_GESTURE_TAP	a tap gesture

enum GripDeviceType

Describes certain properties of a gesture input device.

Members

GRIP_DEVICE_TOUCHSCREEN	device is a touchscreen.
GRIP_DEVICE_TOUCHPAD	device is a touchpad
GRIP_DEVICE_INDEPENDENT	device is a Magic Mouse

GRIP_DEVICE_ALL

#define GRIP_DEVICE_ALL (GRIP_DEVICE_TOUCHSCREEN | GRIP_DEVICE_TOUCHPAD | GRIP_DEVICE_INDEPENDENT)

enum GripTimeType

Indicates the part of the gesture stream ocuuring during the gesture event.

Members

GRIP_TIME_START	a new gesture is starting
GRIP_TIME_UPDATE	an existing gesture is updating
GRIP_TIME_END	a gesture is ending

union GripGestureEvent

This is a boxed type.

Members

GripGestureType `type`;	the GripGestureType, selects the variant record
GripEventGestureAny `any`;
GripEventGestureDrag `drag`;	the event contains a drag gesture record
GripEventGesturePinch `pinch`;	the event contains a pinch gesture record
GripEventGestureRotate `rotate`;	the event contains a rotate gesture record
GripEventGestureTap `tap`;	the event contains a tap gesture record

struct GripEventGestureAny

struct GripEventGestureAny {
  GdkEventType  type;
  GdkWindow    *window;
};

This struct is not used.

struct GripEventGestureDrag

struct GripEventGestureDrag {
  GripGestureType   type;
  guint             id;
  GdkWindow        *window;
  GdkWindow        *root;
  GdkWindow        *child;
  guint32           timestamp;
  gint              fingers;
  gdouble           focus_x;
  gdouble           focus_y;
  gint              delta_x;
  gint              delta_y;
  gdouble           velocity_x;
  gdouble           velocity_y;
  gdouble           position_x;
  gdouble           position_y;
  GripInputDevice  *input_device;
};

Data associated with a drag event. A drag is a lateral motion.

Members

GripGestureType `type`;	the GripGestureType of the gesture
guint `id`;	identifies the gesture
GdkWindow *`window`;	the GdkWindow in which the gesture occurred
GdkWindow *`root`;	the root GdkWindow
GdkWindow *`child`;	the child GdkWindow
guint32 `timestamp`;	the time the gesture event occurred
gint `fingers`;	the number of touches making up the gesture
gdouble `focus_x`;	the X coordinate of the focus point of the gesture start
gdouble `focus_y`;	the Y coordinate of the focus point of the gesture start
gint `delta_x`;	the change in the X coordinate since the last gesture event
gint `delta_y`;	the change in the Y coordinate since the last gesture event
gdouble `velocity_x`;	the rate of change of the X coordinate
gdouble `velocity_y`;	the rate of change of the Y coordinate
gdouble `position_x`;	the current X coordinate of the centroid poistion of the touches
gdouble `position_y`;	the current Y coordinate of the centroid poistion of the touches
GripInputDevice *`input_device`;	the GripInputDevice used to make the gesture

struct GripEventGesturePinch

struct GripEventGesturePinch {
  GripGestureType   type;
  guint             id;
  GdkWindow        *window;
  GdkWindow        *root;
  GdkWindow        *child;
  guint32           timestamp;
  guint             fingers;
  gdouble           focus_x;
  gdouble           focus_y;
  gdouble           radius_delta;
  gdouble           radial_velocity;
  gdouble           radius;
  gfloat            position_x;
  gfloat            position_y;
  GripInputDevice  *input_device;
};

Data associated with a pinch event. A pinch is an expand or contract motion.

Members

GripGestureType `type`;	the GripGestureType of the gesture
guint `id`;	identifies the gesture
GdkWindow *`window`;	the GdkWindow in which the gesture occurred
GdkWindow *`root`;	the root GdkWindow
GdkWindow *`child`;	the child GdkWindow
guint32 `timestamp`;	the time the gesture event occurred
guint `fingers`;	the number of touches making up the gesture
gdouble `focus_x`;	the X coordinate of the focus point of the gesture start
gdouble `focus_y`;	the Y coordinate of the focus point of the gesture start
gdouble `radius_delta`;	the change in the radius (in screen coordinates)
gdouble `radial_velocity`;	the rate of change of the radius
gdouble `radius`;	the current radius (in screen coordinates)
gfloat `position_x`;	the current X coordinate of the centroid poistion of the touches
gfloat `position_y`;	the current Y coordinate of the centroid poistion of the touches
GripInputDevice *`input_device`;	the GripInputDevice used to make the gesture

struct GripEventGestureRotate

struct GripEventGestureRotate {
  GripGestureType  type;
  guint             id;
  GdkWindow        *window;
  GdkWindow        *root;
  GdkWindow        *child;
  guint32           timestamp;
  guint             fingers;
  gdouble           focus_x;
  gdouble           focus_y;
  gdouble           angle_delta;
  gdouble           angular_velocity;
  gdouble           angle;
  gfloat            position_x;
  gfloat            position_y;
  GripInputDevice  *input_device;
};

Data associated with a rotate gesture event.

Members

GripGestureType `type`;	the GripGestureType of the gesture
guint `id`;	identifies the gesture
GdkWindow *`window`;	the GdkWindow in which the gesture occurred
GdkWindow *`root`;	the root GdkWindow
GdkWindow *`child`;	the child GdkWindow
guint32 `timestamp`;	the time the gesture event occurred
guint `fingers`;	the number of touches making up the gesture
gdouble `focus_x`;	the X coordinate of the focus point of the gesture start
gdouble `focus_y`;	the Y coordinate of the focus point of the gesture start
gdouble `angle_delta`;	the change in the rotation angle (in radians)
gdouble `angular_velocity`;	the rate of change in the rotation angle
gdouble `angle`;	the current rotation angle
gfloat `position_x`;	the current X coordinate of the centroid poistion of the touches
gfloat `position_y`;	the current Y coordinate of the centroid poistion of the touches
GripInputDevice *`input_device`;	the GripInputDevice used to make the gesture

struct GripEventGestureTap

struct GripEventGestureTap {
  GripGestureType  type;
  guint             id;
  GdkWindow        *window;
  GdkWindow        *root;
  GdkWindow        *child;
  guint32           timestamp;
  guint             fingers;
  guint32           tap_time;
  gfloat            focus_x;
  gfloat            focus_y;
  gfloat            position_x;
  gfloat            position_y;
  GripInputDevice  *input_device;
};

Data associated with a tap gesture.

Members

GripGestureType `type`;	the GripGestureType of the gesture
guint `id`;	identifies the gesture
GdkWindow *`window`;	the GdkWindow in which the gesture occurred
GdkWindow *`root`;	the root GdkWindow
GdkWindow *`child`;	the child GdkWindow
guint32 `timestamp`;	the time the gesture event occurred
guint `fingers`;	the number of touches making up the gesture
guint32 `tap_time`;	the duration of the tap
gfloat `focus_x`;	the X coordinate of the focus point of the gesture start
gfloat `focus_y`;	the Y coordinate of the focus point of the gesture start
gfloat `position_x`;	the current X coordinate of the centroid poistion of the touches
gfloat `position_y`;	the current Y coordinate of the centroid poistion of the touches
GripInputDevice *`input_device`;	the GripInputDevice used to make the gesture