GtkGestureRotate

GtkGestureRotate — Rotate gesture

Functions

GtkGesture * gtk_gesture_rotate_new ()
gdouble gtk_gesture_rotate_get_angle_delta ()

Signals

void angle-changed Run First

Types and Values

GtkGestureRotate

Object Hierarchy

    GObject
    ╰── GtkEventController
        ╰── GtkGesture
            ╰── GtkGestureRotate

Includes

#include <gtk/gtk.h>

Description

GtkGestureRotate is a GtkGesture implementation able to recognize 2-finger rotations, whenever the angle between both handled sequences changes, the “angle-changed” signal is emitted.

Functions

gtk_gesture_rotate_new ()

GtkGesture *
gtk_gesture_rotate_new (GtkWidget *widget);

Returns a newly created GtkGesture that recognizes 2-touch rotation gestures.

Parameters

widget

a GtkWidget

Returns

a newly created GtkGestureRotate

Since: 3.14

gtk_gesture_rotate_get_angle_delta ()

gdouble
gtk_gesture_rotate_get_angle_delta (GtkGestureRotate *gesture);

If gesture is active, this function returns the angle difference in radians since the gesture was first recognized. If gesture is not active, 0 is returned.

Parameters

gesture

a GtkGestureRotate

Returns

the angle delta in radians

Since: 3.14

Types and Values

GtkGestureRotate

typedef struct _GtkGestureRotate GtkGestureRotate;

Signal Details

The “angle-changed” signal

void
user_function (GtkGestureRotate *gesture,
               double            angle,
               double            angle_delta,
               gpointer          user_data)

This signal is emitted when the angle between both tracked points changes.

Parameters

gesture

the object on which the signal is emitted

angle

Current angle in radians

angle_delta

Difference with the starting angle, in radians

user_data

user data set when the signal handler was connected.

Flags: Run First

Since: 3.14

See Also

GtkGestureZoom

© 2005–2020 The GNOME Project
Licensed under the GNU Lesser General Public License version 2.1 or later.
https://developer.gnome.org/gtk3/3.24/GtkGestureRotate.html