GI.Gtk.Objects.GestureRotate

GestureRotate is a Gesture implementation able to recognize 2-finger rotations, whenever the angle between both handled sequences changes, the angleChanged signal is emitted.

Exported types

newtype GestureRotate

Memory-managed wrapper type.

Constructors

GestureRotate (ManagedPtr GestureRotate)

Instances

Eq GestureRotate

Defined in GI.Gtk.Objects.GestureRotate

Methods

(==) :: GestureRotate -> GestureRotate -> Bool

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

IsGValue GestureRotate

Convert GestureRotate to and from GValue with toGValue and fromGValue.

Defined in GI.Gtk.Objects.GestureRotate

Methods

toGValue :: GestureRotate -> IO GValue

fromGValue :: GValue -> IO GestureRotate

GObject GestureRotate

Defined in GI.Gtk.Objects.GestureRotate

Methods

gobjectType :: IO GType

HasParentTypes GestureRotate

Defined in GI.Gtk.Objects.GestureRotate

type ParentTypes GestureRotate

Defined in GI.Gtk.Objects.GestureRotate

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

class (GObject o, IsDescendantOf GestureRotate o) => IsGestureRotate o

Type class for types which can be safely cast to GestureRotate, for instance with toGestureRotate.

Instances

(GObject o, IsDescendantOf GestureRotate o) => IsGestureRotate o

Defined in GI.Gtk.Objects.GestureRotate

toGestureRotate :: (MonadIO m, IsGestureRotate o) => o -> m GestureRotate

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

noGestureRotate :: Maybe GestureRotate

A convenience alias for Nothing :: Maybe GestureRotate.

Methods

Overloaded methods

getAngleDelta

gestureRotateGetAngleDelta

Arguments

:: (HasCallStack, MonadIO m, IsGestureRotate a)

=> a

gesture: a GestureRotate

-> m Double

Returns: the angle delta in radians

If gesture is active, this function returns the angle difference in radians since the gesture was first recognized. If gesture is not active, 0 is returned.

Since: 3.14

new

gestureRotateNew

Arguments

:: (HasCallStack, MonadIO m, IsWidget a)

=> a

widget: a Widget

-> m GestureRotate

Returns: a newly created GestureRotate

Returns a newly created Gesture that recognizes 2-touch rotation gestures.

Since: 3.14

Signals

angleChanged

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

Type for the callback on the (unwrapped) C side.

type GestureRotateAngleChangedCallback

Arguments

 = Double

angle: Current angle in radians

-> Double

angleDelta: Difference with the starting angle, in radians

-> IO ()

This signal is emitted when the angle between both tracked points changes.

Since: 3.14

afterGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> GestureRotateAngleChangedCallback -> m SignalHandlerId

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

after gestureRotate #angleChanged callback

genClosure_GestureRotateAngleChanged :: MonadIO m => GestureRotateAngleChangedCallback -> m (GClosure C_GestureRotateAngleChangedCallback)

Wrap the callback into a GClosure.

mk_GestureRotateAngleChangedCallback :: C_GestureRotateAngleChangedCallback -> IO (FunPtr C_GestureRotateAngleChangedCallback)

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

noGestureRotateAngleChangedCallback :: Maybe GestureRotateAngleChangedCallback

A convenience synonym for Nothing :: Maybe GestureRotateAngleChangedCallback.

onGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> GestureRotateAngleChangedCallback -> m SignalHandlerId

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

on gestureRotate #angleChanged callback

wrap_GestureRotateAngleChangedCallback :: GestureRotateAngleChangedCallback -> C_GestureRotateAngleChangedCallback

Wrap a GestureRotateAngleChangedCallback into a C_GestureRotateAngleChangedCallback.