GestureZoom

class GestureZoom(**properties: Any)

Superclasses: Gesture, EventController, Object

GtkGestureZoom is a GtkGesture for 2-finger pinch/zoom gestures.

Whenever the distance between both tracked sequences changes, the scale_changed signal is emitted to report the scale factor.

Constructors

class GestureZoom

classmethod new() → Gesture

Returns a newly created GtkGesture that recognizes pinch/zoom gestures.

Methods

class GestureZoom

get_scale_delta() → float

Gets the 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.

Signals

class GestureZoom.signals

scale_changed(scale: float) → None

Emitted whenever the distance between both tracked sequences changes.

Parameters:

scale – Scale delta, taking the initial state as 1:1