| Copyright | Will Thompson Iñaki García Etxebarria and Jonas Platte |
|---|---|
| License | LGPL-2.1 |
| Maintainer | Iñaki García Etxebarria (inaki@blueleaf.cc) |
| Safe Haskell | None |
| Language | Haskell2010 |
GI.Gtk.Objects.GestureRotate
Description
GestureRotate is a Gesture implementation able to recognize
2-finger rotations, whenever the angle between both handled sequences
changes, the GestureRotate::angle-changed signal is emitted.
Synopsis
- newtype GestureRotate = GestureRotate (ManagedPtr GestureRotate)
- class (GObject o, IsDescendantOf GestureRotate o) => IsGestureRotate o
- toGestureRotate :: (MonadIO m, IsGestureRotate o) => o -> m GestureRotate
- noGestureRotate :: Maybe GestureRotate
- gestureRotateGetAngleDelta :: (HasCallStack, MonadIO m, IsGestureRotate a) => a -> m Double
- gestureRotateNew :: (HasCallStack, MonadIO m, IsWidget a) => a -> m GestureRotate
- type C_GestureRotateAngleChangedCallback = Ptr () -> CDouble -> CDouble -> Ptr () -> IO ()
- type GestureRotateAngleChangedCallback = Double -> Double -> IO ()
- afterGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> GestureRotateAngleChangedCallback -> m SignalHandlerId
- genClosure_GestureRotateAngleChanged :: MonadIO m => GestureRotateAngleChangedCallback -> m (GClosure C_GestureRotateAngleChangedCallback)
- mk_GestureRotateAngleChangedCallback :: C_GestureRotateAngleChangedCallback -> IO (FunPtr C_GestureRotateAngleChangedCallback)
- noGestureRotateAngleChangedCallback :: Maybe GestureRotateAngleChangedCallback
- onGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> GestureRotateAngleChangedCallback -> m SignalHandlerId
- wrap_GestureRotateAngleChangedCallback :: GestureRotateAngleChangedCallback -> C_GestureRotateAngleChangedCallback
Exported types
newtype GestureRotate Source #
Memory-managed wrapper type.
Constructors
| GestureRotate (ManagedPtr GestureRotate) |
Instances
| GObject GestureRotate Source # | |
Defined in GI.Gtk.Objects.GestureRotate Methods gobjectType :: IO GType # | |
| HasParentTypes GestureRotate Source # | |
Defined in GI.Gtk.Objects.GestureRotate | |
| type ParentTypes GestureRotate Source # | |
Defined in GI.Gtk.Objects.GestureRotate | |
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
| (GObject o, IsDescendantOf GestureRotate o) => IsGestureRotate o Source # | |
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.
noGestureRotate :: Maybe GestureRotate Source #
A convenience alias for Nothing :: Maybe GestureRotate.
Methods
getAngleDelta
gestureRotateGetAngleDelta Source #
Arguments
| :: (HasCallStack, MonadIO m, IsGestureRotate a) | |
| => a |
|
| -> 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
Arguments
| :: (HasCallStack, MonadIO m, IsWidget a) | |
| => a |
|
| -> m GestureRotate | Returns: a newly created |
Returns a newly created Gesture that recognizes 2-touch
rotation gestures.
Since: 3.14
Signals
angleChanged
type C_GestureRotateAngleChangedCallback = Ptr () -> CDouble -> CDouble -> Ptr () -> IO () Source #
Type for the callback on the (unwrapped) C side.
type GestureRotateAngleChangedCallback Source #
Arguments
| = Double |
|
| -> Double |
|
| -> 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 Source #
Connect a signal handler for the “angle-changed” 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) Source #
Wrap the callback into a GClosure.
mk_GestureRotateAngleChangedCallback :: C_GestureRotateAngleChangedCallback -> IO (FunPtr C_GestureRotateAngleChangedCallback) Source #
Generate a function pointer callable from C code, from a C_GestureRotateAngleChangedCallback.
noGestureRotateAngleChangedCallback :: Maybe GestureRotateAngleChangedCallback Source #
A convenience synonym for Nothing :: Maybe GestureRotateAngleChangedCallback
onGestureRotateAngleChanged :: (IsGestureRotate a, MonadIO m) => a -> GestureRotateAngleChangedCallback -> m SignalHandlerId Source #
Connect a signal handler for the “angle-changed” signal, to be run before the default handler.
When overloading is enabled, this is equivalent to
on gestureRotate #angleChanged callback