Struct gtk4::GestureZoom[][src]

pub struct GestureZoom(_);
Expand description

GestureZoom is a Gesture for 2-finger pinch/zoom gestures.

Whenever the distance between both tracked sequences changes, the signal::GestureZoom::scale-changed signal is emitted to report the scale factor.

Implements

GestureExt, EventControllerExt, glib::ObjectExt

Implementations

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

Returns

a newly created GestureZoom

Creates a new builder-pattern struct instance to construct GestureZoom objects.

This method returns an instance of GestureZoomBuilder which can be used to create GestureZoom objects.

Gets the scale delta.

If self is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If self is not active, 1 is returned.

Returns

the scale delta

Emitted whenever the distance between both tracked sequences changes.

scale

Scale delta, taking the initial state as 1:1

Trait Implementations

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