gi-gtk-4.0.11: Gtk bindings
CopyrightWill Thompson and Iñaki García Etxebarria
LicenseLGPL-2.1
MaintainerIñaki García Etxebarria
Safe HaskellNone
LanguageHaskell2010

GI.Gtk.Objects.GestureRotate

Description

GtkGestureRotate is a GtkGesture for 2-finger rotations.

Whenever the angle between both handled sequences changes, the GestureRotate::angleChanged signal is emitted.

Synopsis

Exported types

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

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

Instances

Instances details
(GObject o, IsDescendantOf GestureRotate o) => IsGestureRotate o Source # 
Instance details

Defined in GI.Gtk.Objects.GestureRotate

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

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

Methods

getAngleDelta

gestureRotateGetAngleDelta Source #

Arguments

:: (HasCallStack, MonadIO m, IsGestureRotate a) 
=> a

gesture: a GtkGestureRotate

-> m Double

Returns: the angle delta in radians

Gets 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.

new

gestureRotateNew Source #

Arguments

:: (HasCallStack, MonadIO m) 
=> m GestureRotate

Returns: a newly created GtkGestureRotate

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

Signals

angleChanged

type GestureRotateAngleChangedCallback Source #

Arguments

 = Double

angle: Current angle in radians

-> Double

angleDelta: Difference with the starting angle, in radians

-> IO () 

Emitted when the angle between both tracked points changes.

afterGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> ((?self :: a) => GestureRotateAngleChangedCallback) -> m SignalHandlerId Source #

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

By default the object invoking the signal is not passed to the callback. If you need to access it, you can use the implit ?self parameter. Note that this requires activating the ImplicitParams GHC extension.

onGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> ((?self :: a) => GestureRotateAngleChangedCallback) -> m SignalHandlerId Source #

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