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GestureZoom
===================================================================

.. currentmodule:: gi.repository.Gtk





.. class:: GestureZoom(**properties: ~typing.Any)
   :no-contents-entry:


Superclasses: :class:`~gi.repository.Gtk.Gesture`, :class:`~gi.repository.Gtk.EventController`, :class:`~gi.repository.GObject.Object`





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

Whenever the distance between both tracked sequences changes, the
:obj:`~gi.repository.Gtk.GestureZoom.signals.scale_changed` signal is emitted to report
the scale factor.



Constructors
------------

.. rst-class:: interim-class

.. class:: GestureZoom
   :no-index:


   .. classmethod:: new() -> ~gi.repository.Gtk.Gesture

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














Methods
-------

.. rst-class:: interim-class

.. class:: GestureZoom
   :no-index:


   .. method:: 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
-------

.. rst-class:: interim-class

.. class:: GestureZoom.signals
   :no-index:
   

   .. method:: scale_changed(scale: float) -> None

      Emitted whenever the distance between both tracked sequences changes.







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