GI.Gtk.Objects.GestureZoom

GestureZoom is a Gesture implementation able to recognize pinch/zoom gestures, whenever the distance between both tracked sequences changes, the GestureZoom::scale-changed signal is emitted to report the scale factor.

Exported types

newtype GestureZoom

Constructors

GestureZoom (ManagedPtr GestureZoom)

Instances

GObject GestureZoom

Methods

gobjectType :: GestureZoom -> IO GType

IsObject GestureZoom

IsGesture GestureZoom

IsEventController GestureZoom

IsGestureZoom GestureZoom

class GObject o => IsGestureZoom o

Instances

(GObject a, UnknownAncestorError Constraint GestureZoom a) => IsGestureZoom a

IsGestureZoom GestureZoom

toGestureZoom :: (MonadIO m, IsGestureZoom o) => o -> m GestureZoom

noGestureZoom :: Maybe GestureZoom

Methods

getScaleDelta

gestureZoomGetScaleDelta

Arguments

:: (HasCallStack, MonadIO m, IsGestureZoom a)

=> a

gesture: a GestureZoom

-> m Double

Returns: 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.

Since: 3.14

new

gestureZoomNew

Arguments

:: (HasCallStack, MonadIO m, IsWidget a)

=> a

widget: a Widget

-> m GestureZoom

Returns: a newly created GestureZoom

Returns a newly created Gesture that recognizes zoom in/out gestures (usually known as pinch/zoom).

Since: 3.14

Signals

scaleChanged

type C_GestureZoomScaleChangedCallback = Ptr () -> CDouble -> Ptr () -> IO ()

type GestureZoomScaleChangedCallback = Double -> IO ()

afterGestureZoomScaleChanged :: (IsGestureZoom a, MonadIO m) => a -> GestureZoomScaleChangedCallback -> m SignalHandlerId

genClosure_GestureZoomScaleChanged :: GestureZoomScaleChangedCallback -> IO Closure

mk_GestureZoomScaleChangedCallback :: C_GestureZoomScaleChangedCallback -> IO (FunPtr C_GestureZoomScaleChangedCallback)

noGestureZoomScaleChangedCallback :: Maybe GestureZoomScaleChangedCallback

onGestureZoomScaleChanged :: (IsGestureZoom a, MonadIO m) => a -> GestureZoomScaleChangedCallback -> m SignalHandlerId

wrap_GestureZoomScaleChangedCallback :: GestureZoomScaleChangedCallback -> Ptr () -> CDouble -> Ptr () -> IO ()