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GtkGestureZoom is a GtkGesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the “scale-changed” signal is emitted to report the scale factor.
GtkGesture *
gtk_gesture_zoom_new (GtkWidget *widget
);
Returns a newly created GtkGesture that recognizes zoom in/out gestures (usually known as pinch/zoom).
Since: 3.14
gdouble
gtk_gesture_zoom_get_scale_delta (GtkGestureZoom *gesture
);
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: 3.14