GI.Gtk.Objects.GestureZoom

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

Exported types

newtype GestureZoom

Memory-managed wrapper type.

Constructors

GestureZoom (ManagedPtr GestureZoom)

Instances

Eq GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

Methods

(==) :: GestureZoom -> GestureZoom -> Bool

(/=) :: GestureZoom -> GestureZoom -> Bool

GObject GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

ManagedPtrNewtype GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

Methods

toManagedPtr :: GestureZoom -> ManagedPtr GestureZoom

TypedObject GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

Methods

glibType :: IO GType

HasParentTypes GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

IsGValue (Maybe GestureZoom)

Convert GestureZoom to and from GValue. See toGValue and fromGValue.

Defined in GI.Gtk.Objects.GestureZoom

Methods

gvalueGType_ :: IO GType

gvalueSet_ :: Ptr GValue -> Maybe GestureZoom -> IO ()

gvalueGet_ :: Ptr GValue -> IO (Maybe GestureZoom)

type ParentTypes GestureZoom

Defined in GI.Gtk.Objects.GestureZoom

type ParentTypes GestureZoom = '[Gesture, EventController, Object]

class (GObject o, IsDescendantOf GestureZoom o) => IsGestureZoom o

Type class for types which can be safely cast to GestureZoom, for instance with toGestureZoom.

Instances

(GObject o, IsDescendantOf GestureZoom o) => IsGestureZoom o

Defined in GI.Gtk.Objects.GestureZoom

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

Cast to GestureZoom, for types for which this is known to be safe. For general casts, use castTo.

Methods

Click to display all available methods, including inherited ones

Methods

bindProperty, bindPropertyFull, forceFloating, freezeNotify, getv, group, handleEvent, handlesSequence, isActive, isFloating, isGroupedWith, isRecognized, notify, notifyByPspec, ref, refSink, reset, runDispose, stealData, stealQdata, thawNotify, ungroup, unref, watchClosure.

Getters

getBoundingBox, getBoundingBoxCenter, getData, getDevice, getGroup, getLastEvent, getLastUpdatedSequence, getPoint, getPropagationPhase, getProperty, getQdata, getScaleDelta, getSequenceState, getSequences, getWidget, getWindow.

Setters

setData, setDataFull, setPropagationPhase, setProperty, setSequenceState, setState, setWindow.

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 for the callback on the (unwrapped) C side.

type GestureZoomScaleChangedCallback

Arguments

 = Double

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

-> IO ()

This signal is emitted whenever the distance between both tracked sequences changes.

Since: 3.14

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

Connect a signal handler for the scaleChanged signal, to be run after the default handler. When overloading is enabled, this is equivalent to

after gestureZoom #scaleChanged callback

genClosure_GestureZoomScaleChanged :: MonadIO m => GestureZoomScaleChangedCallback -> m (GClosure C_GestureZoomScaleChangedCallback)

Wrap the callback into a GClosure.

mk_GestureZoomScaleChangedCallback :: C_GestureZoomScaleChangedCallback -> IO (FunPtr C_GestureZoomScaleChangedCallback)

Generate a function pointer callable from C code, from a C_GestureZoomScaleChangedCallback.

noGestureZoomScaleChangedCallback :: Maybe GestureZoomScaleChangedCallback

A convenience synonym for Nothing :: Maybe GestureZoomScaleChangedCallback.

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

Connect a signal handler for the scaleChanged signal, to be run before the default handler. When overloading is enabled, this is equivalent to

on gestureZoom #scaleChanged callback

wrap_GestureZoomScaleChangedCallback :: GestureZoomScaleChangedCallback -> C_GestureZoomScaleChangedCallback

Wrap a GestureZoomScaleChangedCallback into a C_GestureZoomScaleChangedCallback.