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
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 |
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 |
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
© 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