{-# LANGUAGE TypeApplications #-}


-- | Copyright  : Will Thompson, Iñaki García Etxebarria and Jonas Platte
-- License    : LGPL-2.1
-- Maintainer : Iñaki García Etxebarria
-- 
-- t'GI.Gtk.Objects.GestureZoom.GestureZoom' is a t'GI.Gtk.Objects.Gesture.Gesture' implementation able to recognize
-- pinch\/zoom gestures, whenever the distance between both tracked
-- sequences changes, the [scaleChanged]("GI.Gtk.Objects.GestureZoom#signal:scaleChanged") signal is
-- emitted to report the scale factor.

#if (MIN_VERSION_haskell_gi_overloading(1,0,0) && !defined(__HADDOCK_VERSION__))
#define ENABLE_OVERLOADING
#endif

module GI.Gtk.Objects.GestureZoom
    ( 

-- * Exported types
    GestureZoom(..)                         ,
    IsGestureZoom                           ,
    toGestureZoom                           ,
    noGestureZoom                           ,


 -- * Methods
-- ** Overloaded methods #method:Overloaded methods#

#if defined(ENABLE_OVERLOADING)
    ResolveGestureZoomMethod                ,
#endif


-- ** getScaleDelta #method:getScaleDelta#

#if defined(ENABLE_OVERLOADING)
    GestureZoomGetScaleDeltaMethodInfo      ,
#endif
    gestureZoomGetScaleDelta                ,


-- ** new #method:new#

    gestureZoomNew                          ,




 -- * Signals
-- ** scaleChanged #signal:scaleChanged#

    C_GestureZoomScaleChangedCallback       ,
    GestureZoomScaleChangedCallback         ,
#if defined(ENABLE_OVERLOADING)
    GestureZoomScaleChangedSignalInfo       ,
#endif
    afterGestureZoomScaleChanged            ,
    genClosure_GestureZoomScaleChanged      ,
    mk_GestureZoomScaleChangedCallback      ,
    noGestureZoomScaleChangedCallback       ,
    onGestureZoomScaleChanged               ,
    wrap_GestureZoomScaleChangedCallback    ,




    ) where

import Data.GI.Base.ShortPrelude
import qualified Data.GI.Base.ShortPrelude as SP
import qualified Data.GI.Base.Overloading as O
import qualified Prelude as P

import qualified Data.GI.Base.Attributes as GI.Attributes
import qualified Data.GI.Base.ManagedPtr as B.ManagedPtr
import qualified Data.GI.Base.GClosure as B.GClosure
import qualified Data.GI.Base.GError as B.GError
import qualified Data.GI.Base.GVariant as B.GVariant
import qualified Data.GI.Base.GValue as B.GValue
import qualified Data.GI.Base.GParamSpec as B.GParamSpec
import qualified Data.GI.Base.CallStack as B.CallStack
import qualified Data.GI.Base.Properties as B.Properties
import qualified Data.GI.Base.Signals as B.Signals
import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map
import qualified Foreign.Ptr as FP
import qualified GHC.OverloadedLabels as OL

import qualified GI.GObject.Objects.Object as GObject.Object
import {-# SOURCE #-} qualified GI.Gtk.Objects.EventController as Gtk.EventController
import {-# SOURCE #-} qualified GI.Gtk.Objects.Gesture as Gtk.Gesture
import {-# SOURCE #-} qualified GI.Gtk.Objects.Widget as Gtk.Widget

-- | Memory-managed wrapper type.
newtype GestureZoom = GestureZoom (ManagedPtr GestureZoom)
    deriving (GestureZoom -> GestureZoom -> Bool
(GestureZoom -> GestureZoom -> Bool)
-> (GestureZoom -> GestureZoom -> Bool) -> Eq GestureZoom
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: GestureZoom -> GestureZoom -> Bool
$c/= :: GestureZoom -> GestureZoom -> Bool
== :: GestureZoom -> GestureZoom -> Bool
$c== :: GestureZoom -> GestureZoom -> Bool
Eq)
foreign import ccall "gtk_gesture_zoom_get_type"
    c_gtk_gesture_zoom_get_type :: IO GType

instance GObject GestureZoom where
    gobjectType :: IO GType
gobjectType = IO GType
c_gtk_gesture_zoom_get_type
    

-- | Convert 'GestureZoom' to and from 'Data.GI.Base.GValue.GValue' with 'Data.GI.Base.GValue.toGValue' and 'Data.GI.Base.GValue.fromGValue'.
instance B.GValue.IsGValue GestureZoom where
    toGValue :: GestureZoom -> IO GValue
toGValue o :: GestureZoom
o = do
        GType
gtype <- IO GType
c_gtk_gesture_zoom_get_type
        GestureZoom -> (Ptr GestureZoom -> IO GValue) -> IO GValue
forall a c.
(HasCallStack, ManagedPtrNewtype a) =>
a -> (Ptr a -> IO c) -> IO c
B.ManagedPtr.withManagedPtr GestureZoom
o (GType
-> (GValue -> Ptr GestureZoom -> IO ())
-> Ptr GestureZoom
-> IO GValue
forall a. GType -> (GValue -> a -> IO ()) -> a -> IO GValue
B.GValue.buildGValue GType
gtype GValue -> Ptr GestureZoom -> IO ()
forall a. GObject a => GValue -> Ptr a -> IO ()
B.GValue.set_object)
        
    fromGValue :: GValue -> IO GestureZoom
fromGValue gv :: GValue
gv = do
        Ptr GestureZoom
ptr <- GValue -> IO (Ptr GestureZoom)
forall b. GObject b => GValue -> IO (Ptr b)
B.GValue.get_object GValue
gv :: IO (Ptr GestureZoom)
        (ManagedPtr GestureZoom -> GestureZoom)
-> Ptr GestureZoom -> IO GestureZoom
forall a b.
(HasCallStack, GObject a, GObject b) =>
(ManagedPtr a -> a) -> Ptr b -> IO a
B.ManagedPtr.newObject ManagedPtr GestureZoom -> GestureZoom
GestureZoom Ptr GestureZoom
ptr
        
    

-- | Type class for types which can be safely cast to `GestureZoom`, for instance with `toGestureZoom`.
class (GObject o, O.IsDescendantOf GestureZoom o) => IsGestureZoom o
instance (GObject o, O.IsDescendantOf GestureZoom o) => IsGestureZoom o

instance O.HasParentTypes GestureZoom
type instance O.ParentTypes GestureZoom = '[Gtk.Gesture.Gesture, Gtk.EventController.EventController, GObject.Object.Object]

-- | Cast to `GestureZoom`, for types for which this is known to be safe. For general casts, use `Data.GI.Base.ManagedPtr.castTo`.
toGestureZoom :: (MonadIO m, IsGestureZoom o) => o -> m GestureZoom
toGestureZoom :: o -> m GestureZoom
toGestureZoom = IO GestureZoom -> m GestureZoom
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO GestureZoom -> m GestureZoom)
-> (o -> IO GestureZoom) -> o -> m GestureZoom
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (ManagedPtr GestureZoom -> GestureZoom) -> o -> IO GestureZoom
forall o o'.
(HasCallStack, GObject o, GObject o') =>
(ManagedPtr o' -> o') -> o -> IO o'
unsafeCastTo ManagedPtr GestureZoom -> GestureZoom
GestureZoom

-- | A convenience alias for `Nothing` :: `Maybe` `GestureZoom`.
noGestureZoom :: Maybe GestureZoom
noGestureZoom :: Maybe GestureZoom
noGestureZoom = Maybe GestureZoom
forall a. Maybe a
Nothing

#if defined(ENABLE_OVERLOADING)
type family ResolveGestureZoomMethod (t :: Symbol) (o :: *) :: * where
    ResolveGestureZoomMethod "bindProperty" o = GObject.Object.ObjectBindPropertyMethodInfo
    ResolveGestureZoomMethod "bindPropertyFull" o = GObject.Object.ObjectBindPropertyFullMethodInfo
    ResolveGestureZoomMethod "forceFloating" o = GObject.Object.ObjectForceFloatingMethodInfo
    ResolveGestureZoomMethod "freezeNotify" o = GObject.Object.ObjectFreezeNotifyMethodInfo
    ResolveGestureZoomMethod "getv" o = GObject.Object.ObjectGetvMethodInfo
    ResolveGestureZoomMethod "group" o = Gtk.Gesture.GestureGroupMethodInfo
    ResolveGestureZoomMethod "handleEvent" o = Gtk.EventController.EventControllerHandleEventMethodInfo
    ResolveGestureZoomMethod "handlesSequence" o = Gtk.Gesture.GestureHandlesSequenceMethodInfo
    ResolveGestureZoomMethod "isActive" o = Gtk.Gesture.GestureIsActiveMethodInfo
    ResolveGestureZoomMethod "isFloating" o = GObject.Object.ObjectIsFloatingMethodInfo
    ResolveGestureZoomMethod "isGroupedWith" o = Gtk.Gesture.GestureIsGroupedWithMethodInfo
    ResolveGestureZoomMethod "isRecognized" o = Gtk.Gesture.GestureIsRecognizedMethodInfo
    ResolveGestureZoomMethod "notify" o = GObject.Object.ObjectNotifyMethodInfo
    ResolveGestureZoomMethod "notifyByPspec" o = GObject.Object.ObjectNotifyByPspecMethodInfo
    ResolveGestureZoomMethod "ref" o = GObject.Object.ObjectRefMethodInfo
    ResolveGestureZoomMethod "refSink" o = GObject.Object.ObjectRefSinkMethodInfo
    ResolveGestureZoomMethod "reset" o = Gtk.EventController.EventControllerResetMethodInfo
    ResolveGestureZoomMethod "runDispose" o = GObject.Object.ObjectRunDisposeMethodInfo
    ResolveGestureZoomMethod "stealData" o = GObject.Object.ObjectStealDataMethodInfo
    ResolveGestureZoomMethod "stealQdata" o = GObject.Object.ObjectStealQdataMethodInfo
    ResolveGestureZoomMethod "thawNotify" o = GObject.Object.ObjectThawNotifyMethodInfo
    ResolveGestureZoomMethod "ungroup" o = Gtk.Gesture.GestureUngroupMethodInfo
    ResolveGestureZoomMethod "unref" o = GObject.Object.ObjectUnrefMethodInfo
    ResolveGestureZoomMethod "watchClosure" o = GObject.Object.ObjectWatchClosureMethodInfo
    ResolveGestureZoomMethod "getBoundingBox" o = Gtk.Gesture.GestureGetBoundingBoxMethodInfo
    ResolveGestureZoomMethod "getBoundingBoxCenter" o = Gtk.Gesture.GestureGetBoundingBoxCenterMethodInfo
    ResolveGestureZoomMethod "getData" o = GObject.Object.ObjectGetDataMethodInfo
    ResolveGestureZoomMethod "getDevice" o = Gtk.Gesture.GestureGetDeviceMethodInfo
    ResolveGestureZoomMethod "getGroup" o = Gtk.Gesture.GestureGetGroupMethodInfo
    ResolveGestureZoomMethod "getLastEvent" o = Gtk.Gesture.GestureGetLastEventMethodInfo
    ResolveGestureZoomMethod "getLastUpdatedSequence" o = Gtk.Gesture.GestureGetLastUpdatedSequenceMethodInfo
    ResolveGestureZoomMethod "getPoint" o = Gtk.Gesture.GestureGetPointMethodInfo
    ResolveGestureZoomMethod "getPropagationPhase" o = Gtk.EventController.EventControllerGetPropagationPhaseMethodInfo
    ResolveGestureZoomMethod "getProperty" o = GObject.Object.ObjectGetPropertyMethodInfo
    ResolveGestureZoomMethod "getQdata" o = GObject.Object.ObjectGetQdataMethodInfo
    ResolveGestureZoomMethod "getScaleDelta" o = GestureZoomGetScaleDeltaMethodInfo
    ResolveGestureZoomMethod "getSequenceState" o = Gtk.Gesture.GestureGetSequenceStateMethodInfo
    ResolveGestureZoomMethod "getSequences" o = Gtk.Gesture.GestureGetSequencesMethodInfo
    ResolveGestureZoomMethod "getWidget" o = Gtk.EventController.EventControllerGetWidgetMethodInfo
    ResolveGestureZoomMethod "getWindow" o = Gtk.Gesture.GestureGetWindowMethodInfo
    ResolveGestureZoomMethod "setData" o = GObject.Object.ObjectSetDataMethodInfo
    ResolveGestureZoomMethod "setDataFull" o = GObject.Object.ObjectSetDataFullMethodInfo
    ResolveGestureZoomMethod "setPropagationPhase" o = Gtk.EventController.EventControllerSetPropagationPhaseMethodInfo
    ResolveGestureZoomMethod "setProperty" o = GObject.Object.ObjectSetPropertyMethodInfo
    ResolveGestureZoomMethod "setSequenceState" o = Gtk.Gesture.GestureSetSequenceStateMethodInfo
    ResolveGestureZoomMethod "setState" o = Gtk.Gesture.GestureSetStateMethodInfo
    ResolveGestureZoomMethod "setWindow" o = Gtk.Gesture.GestureSetWindowMethodInfo
    ResolveGestureZoomMethod l o = O.MethodResolutionFailed l o

instance (info ~ ResolveGestureZoomMethod t GestureZoom, O.MethodInfo info GestureZoom p) => OL.IsLabel t (GestureZoom -> p) where
#if MIN_VERSION_base(4,10,0)
    fromLabel = O.overloadedMethod @info
#else
    fromLabel _ = O.overloadedMethod @info
#endif

#endif

-- signal GestureZoom::scale-changed
-- | This signal is emitted whenever the distance between both tracked
-- sequences changes.
-- 
-- /Since: 3.14/
type GestureZoomScaleChangedCallback =
    Double
    -- ^ /@scale@/: Scale delta, taking the initial state as 1:1
    -> IO ()

-- | A convenience synonym for @`Nothing` :: `Maybe` `GestureZoomScaleChangedCallback`@.
noGestureZoomScaleChangedCallback :: Maybe GestureZoomScaleChangedCallback
noGestureZoomScaleChangedCallback :: Maybe GestureZoomScaleChangedCallback
noGestureZoomScaleChangedCallback = Maybe GestureZoomScaleChangedCallback
forall a. Maybe a
Nothing

-- | Type for the callback on the (unwrapped) C side.
type C_GestureZoomScaleChangedCallback =
    Ptr () ->                               -- object
    CDouble ->
    Ptr () ->                               -- user_data
    IO ()

-- | Generate a function pointer callable from C code, from a `C_GestureZoomScaleChangedCallback`.
foreign import ccall "wrapper"
    mk_GestureZoomScaleChangedCallback :: C_GestureZoomScaleChangedCallback -> IO (FunPtr C_GestureZoomScaleChangedCallback)

-- | Wrap the callback into a `GClosure`.
genClosure_GestureZoomScaleChanged :: MonadIO m => GestureZoomScaleChangedCallback -> m (GClosure C_GestureZoomScaleChangedCallback)
genClosure_GestureZoomScaleChanged :: GestureZoomScaleChangedCallback
-> m (GClosure C_GestureZoomScaleChangedCallback)
genClosure_GestureZoomScaleChanged cb :: GestureZoomScaleChangedCallback
cb = IO (GClosure C_GestureZoomScaleChangedCallback)
-> m (GClosure C_GestureZoomScaleChangedCallback)
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO (GClosure C_GestureZoomScaleChangedCallback)
 -> m (GClosure C_GestureZoomScaleChangedCallback))
-> IO (GClosure C_GestureZoomScaleChangedCallback)
-> m (GClosure C_GestureZoomScaleChangedCallback)
forall a b. (a -> b) -> a -> b
$ do
    let cb' :: C_GestureZoomScaleChangedCallback
cb' = GestureZoomScaleChangedCallback
-> C_GestureZoomScaleChangedCallback
wrap_GestureZoomScaleChangedCallback GestureZoomScaleChangedCallback
cb
    C_GestureZoomScaleChangedCallback
-> IO (FunPtr C_GestureZoomScaleChangedCallback)
mk_GestureZoomScaleChangedCallback C_GestureZoomScaleChangedCallback
cb' IO (FunPtr C_GestureZoomScaleChangedCallback)
-> (FunPtr C_GestureZoomScaleChangedCallback
    -> IO (GClosure C_GestureZoomScaleChangedCallback))
-> IO (GClosure C_GestureZoomScaleChangedCallback)
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= FunPtr C_GestureZoomScaleChangedCallback
-> IO (GClosure C_GestureZoomScaleChangedCallback)
forall (m :: * -> *) a. MonadIO m => FunPtr a -> m (GClosure a)
B.GClosure.newGClosure


-- | Wrap a `GestureZoomScaleChangedCallback` into a `C_GestureZoomScaleChangedCallback`.
wrap_GestureZoomScaleChangedCallback ::
    GestureZoomScaleChangedCallback ->
    C_GestureZoomScaleChangedCallback
wrap_GestureZoomScaleChangedCallback :: GestureZoomScaleChangedCallback
-> C_GestureZoomScaleChangedCallback
wrap_GestureZoomScaleChangedCallback _cb :: GestureZoomScaleChangedCallback
_cb _ scale :: CDouble
scale _ = do
    let scale' :: Double
scale' = CDouble -> Double
forall a b. (Real a, Fractional b) => a -> b
realToFrac CDouble
scale
    GestureZoomScaleChangedCallback
_cb  Double
scale'


-- | Connect a signal handler for the [scaleChanged](#signal:scaleChanged) signal, to be run before the default handler.
-- When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to
-- 
-- @
-- 'Data.GI.Base.Signals.on' gestureZoom #scaleChanged callback
-- @
-- 
-- 
onGestureZoomScaleChanged :: (IsGestureZoom a, MonadIO m) => a -> GestureZoomScaleChangedCallback -> m SignalHandlerId
onGestureZoomScaleChanged :: a -> GestureZoomScaleChangedCallback -> m SignalHandlerId
onGestureZoomScaleChanged obj :: a
obj cb :: GestureZoomScaleChangedCallback
cb = IO SignalHandlerId -> m SignalHandlerId
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO SignalHandlerId -> m SignalHandlerId)
-> IO SignalHandlerId -> m SignalHandlerId
forall a b. (a -> b) -> a -> b
$ do
    let cb' :: C_GestureZoomScaleChangedCallback
cb' = GestureZoomScaleChangedCallback
-> C_GestureZoomScaleChangedCallback
wrap_GestureZoomScaleChangedCallback GestureZoomScaleChangedCallback
cb
    FunPtr C_GestureZoomScaleChangedCallback
cb'' <- C_GestureZoomScaleChangedCallback
-> IO (FunPtr C_GestureZoomScaleChangedCallback)
mk_GestureZoomScaleChangedCallback C_GestureZoomScaleChangedCallback
cb'
    a
-> Text
-> FunPtr C_GestureZoomScaleChangedCallback
-> SignalConnectMode
-> Maybe Text
-> IO SignalHandlerId
forall o a.
GObject o =>
o
-> Text
-> FunPtr a
-> SignalConnectMode
-> Maybe Text
-> IO SignalHandlerId
connectSignalFunPtr a
obj "scale-changed" FunPtr C_GestureZoomScaleChangedCallback
cb'' SignalConnectMode
SignalConnectBefore Maybe Text
forall a. Maybe a
Nothing

-- | Connect a signal handler for the [scaleChanged](#signal:scaleChanged) signal, to be run after the default handler.
-- When <https://github.com/haskell-gi/haskell-gi/wiki/Overloading overloading> is enabled, this is equivalent to
-- 
-- @
-- 'Data.GI.Base.Signals.after' gestureZoom #scaleChanged callback
-- @
-- 
-- 
afterGestureZoomScaleChanged :: (IsGestureZoom a, MonadIO m) => a -> GestureZoomScaleChangedCallback -> m SignalHandlerId
afterGestureZoomScaleChanged :: a -> GestureZoomScaleChangedCallback -> m SignalHandlerId
afterGestureZoomScaleChanged obj :: a
obj cb :: GestureZoomScaleChangedCallback
cb = IO SignalHandlerId -> m SignalHandlerId
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO SignalHandlerId -> m SignalHandlerId)
-> IO SignalHandlerId -> m SignalHandlerId
forall a b. (a -> b) -> a -> b
$ do
    let cb' :: C_GestureZoomScaleChangedCallback
cb' = GestureZoomScaleChangedCallback
-> C_GestureZoomScaleChangedCallback
wrap_GestureZoomScaleChangedCallback GestureZoomScaleChangedCallback
cb
    FunPtr C_GestureZoomScaleChangedCallback
cb'' <- C_GestureZoomScaleChangedCallback
-> IO (FunPtr C_GestureZoomScaleChangedCallback)
mk_GestureZoomScaleChangedCallback C_GestureZoomScaleChangedCallback
cb'
    a
-> Text
-> FunPtr C_GestureZoomScaleChangedCallback
-> SignalConnectMode
-> Maybe Text
-> IO SignalHandlerId
forall o a.
GObject o =>
o
-> Text
-> FunPtr a
-> SignalConnectMode
-> Maybe Text
-> IO SignalHandlerId
connectSignalFunPtr a
obj "scale-changed" FunPtr C_GestureZoomScaleChangedCallback
cb'' SignalConnectMode
SignalConnectAfter Maybe Text
forall a. Maybe a
Nothing


#if defined(ENABLE_OVERLOADING)
data GestureZoomScaleChangedSignalInfo
instance SignalInfo GestureZoomScaleChangedSignalInfo where
    type HaskellCallbackType GestureZoomScaleChangedSignalInfo = GestureZoomScaleChangedCallback
    connectSignal obj cb connectMode detail = do
        let cb' = wrap_GestureZoomScaleChangedCallback cb
        cb'' <- mk_GestureZoomScaleChangedCallback cb'
        connectSignalFunPtr obj "scale-changed" cb'' connectMode detail

#endif

#if defined(ENABLE_OVERLOADING)
instance O.HasAttributeList GestureZoom
type instance O.AttributeList GestureZoom = GestureZoomAttributeList
type GestureZoomAttributeList = ('[ '("nPoints", Gtk.Gesture.GestureNPointsPropertyInfo), '("propagationPhase", Gtk.EventController.EventControllerPropagationPhasePropertyInfo), '("widget", Gtk.EventController.EventControllerWidgetPropertyInfo), '("window", Gtk.Gesture.GestureWindowPropertyInfo)] :: [(Symbol, *)])
#endif

#if defined(ENABLE_OVERLOADING)
#endif

#if defined(ENABLE_OVERLOADING)
type instance O.SignalList GestureZoom = GestureZoomSignalList
type GestureZoomSignalList = ('[ '("begin", Gtk.Gesture.GestureBeginSignalInfo), '("cancel", Gtk.Gesture.GestureCancelSignalInfo), '("end", Gtk.Gesture.GestureEndSignalInfo), '("notify", GObject.Object.ObjectNotifySignalInfo), '("scaleChanged", GestureZoomScaleChangedSignalInfo), '("sequenceStateChanged", Gtk.Gesture.GestureSequenceStateChangedSignalInfo), '("update", Gtk.Gesture.GestureUpdateSignalInfo)] :: [(Symbol, *)])

#endif

-- method GestureZoom::new
-- method type : Constructor
-- Args: [ Arg
--           { argCName = "widget"
--           , argType = TInterface Name { namespace = "Gtk" , name = "Widget" }
--           , direction = DirectionIn
--           , mayBeNull = False
--           , argDoc =
--               Documentation
--                 { rawDocText = Just "a #GtkWidget" , sinceVersion = Nothing }
--           , argScope = ScopeTypeInvalid
--           , argClosure = -1
--           , argDestroy = -1
--           , argCallerAllocates = False
--           , transfer = TransferNothing
--           }
--       ]
-- Lengths: []
-- returnType: Just (TInterface Name { namespace = "Gtk" , name = "GestureZoom" })
-- throws : False
-- Skip return : False

foreign import ccall "gtk_gesture_zoom_new" gtk_gesture_zoom_new :: 
    Ptr Gtk.Widget.Widget ->                -- widget : TInterface (Name {namespace = "Gtk", name = "Widget"})
    IO (Ptr GestureZoom)

-- | Returns a newly created t'GI.Gtk.Objects.Gesture.Gesture' that recognizes zoom
-- in\/out gestures (usually known as pinch\/zoom).
-- 
-- /Since: 3.14/
gestureZoomNew ::
    (B.CallStack.HasCallStack, MonadIO m, Gtk.Widget.IsWidget a) =>
    a
    -- ^ /@widget@/: a t'GI.Gtk.Objects.Widget.Widget'
    -> m GestureZoom
    -- ^ __Returns:__ a newly created t'GI.Gtk.Objects.GestureZoom.GestureZoom'
gestureZoomNew :: a -> m GestureZoom
gestureZoomNew widget :: a
widget = IO GestureZoom -> m GestureZoom
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO GestureZoom -> m GestureZoom)
-> IO GestureZoom -> m GestureZoom
forall a b. (a -> b) -> a -> b
$ do
    Ptr Widget
widget' <- a -> IO (Ptr Widget)
forall a b. (HasCallStack, ManagedPtrNewtype a) => a -> IO (Ptr b)
unsafeManagedPtrCastPtr a
widget
    Ptr GestureZoom
result <- Ptr Widget -> IO (Ptr GestureZoom)
gtk_gesture_zoom_new Ptr Widget
widget'
    Text -> Ptr GestureZoom -> IO ()
forall a. HasCallStack => Text -> Ptr a -> IO ()
checkUnexpectedReturnNULL "gestureZoomNew" Ptr GestureZoom
result
    GestureZoom
result' <- ((ManagedPtr GestureZoom -> GestureZoom)
-> Ptr GestureZoom -> IO GestureZoom
forall a b.
(HasCallStack, GObject a, GObject b) =>
(ManagedPtr a -> a) -> Ptr b -> IO a
wrapObject ManagedPtr GestureZoom -> GestureZoom
GestureZoom) Ptr GestureZoom
result
    a -> IO ()
forall a. ManagedPtrNewtype a => a -> IO ()
touchManagedPtr a
widget
    GestureZoom -> IO GestureZoom
forall (m :: * -> *) a. Monad m => a -> m a
return GestureZoom
result'

#if defined(ENABLE_OVERLOADING)
#endif

-- method GestureZoom::get_scale_delta
-- method type : OrdinaryMethod
-- Args: [ Arg
--           { argCName = "gesture"
--           , argType =
--               TInterface Name { namespace = "Gtk" , name = "GestureZoom" }
--           , direction = DirectionIn
--           , mayBeNull = False
--           , argDoc =
--               Documentation
--                 { rawDocText = Just "a #GtkGestureZoom" , sinceVersion = Nothing }
--           , argScope = ScopeTypeInvalid
--           , argClosure = -1
--           , argDestroy = -1
--           , argCallerAllocates = False
--           , transfer = TransferNothing
--           }
--       ]
-- Lengths: []
-- returnType: Just (TBasicType TDouble)
-- throws : False
-- Skip return : False

foreign import ccall "gtk_gesture_zoom_get_scale_delta" gtk_gesture_zoom_get_scale_delta :: 
    Ptr GestureZoom ->                      -- gesture : TInterface (Name {namespace = "Gtk", name = "GestureZoom"})
    IO CDouble

-- | 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/
gestureZoomGetScaleDelta ::
    (B.CallStack.HasCallStack, MonadIO m, IsGestureZoom a) =>
    a
    -- ^ /@gesture@/: a t'GI.Gtk.Objects.GestureZoom.GestureZoom'
    -> m Double
    -- ^ __Returns:__ the scale delta
gestureZoomGetScaleDelta :: a -> m Double
gestureZoomGetScaleDelta gesture :: a
gesture = IO Double -> m Double
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO Double -> m Double) -> IO Double -> m Double
forall a b. (a -> b) -> a -> b
$ do
    Ptr GestureZoom
gesture' <- a -> IO (Ptr GestureZoom)
forall a b. (HasCallStack, ManagedPtrNewtype a) => a -> IO (Ptr b)
unsafeManagedPtrCastPtr a
gesture
    CDouble
result <- Ptr GestureZoom -> IO CDouble
gtk_gesture_zoom_get_scale_delta Ptr GestureZoom
gesture'
    let result' :: Double
result' = CDouble -> Double
forall a b. (Real a, Fractional b) => a -> b
realToFrac CDouble
result
    a -> IO ()
forall a. ManagedPtrNewtype a => a -> IO ()
touchManagedPtr a
gesture
    Double -> IO Double
forall (m :: * -> *) a. Monad m => a -> m a
return Double
result'

#if defined(ENABLE_OVERLOADING)
data GestureZoomGetScaleDeltaMethodInfo
instance (signature ~ (m Double), MonadIO m, IsGestureZoom a) => O.MethodInfo GestureZoomGetScaleDeltaMethodInfo a signature where
    overloadedMethod = gestureZoomGetScaleDelta

#endif