{- | Copyright : Will Thompson, Iñaki García Etxebarria and Jonas Platte License : LGPL-2.1 Maintainer : Iñaki García Etxebarria (garetxe@gmail.com) A GtkTreeRowReference tracks model changes so that it always refers to the same row (a 'GI.Gtk.Structs.TreePath.TreePath' refers to a position, not a fixed row). Create a new GtkTreeRowReference with 'GI.Gtk.Structs.TreeRowReference.treeRowReferenceNew'. -} #define ENABLE_OVERLOADING (MIN_VERSION_haskell_gi_overloading(1,0,0) \ && !defined(__HADDOCK_VERSION__)) module GI.Gtk.Structs.TreeRowReference ( -- * Exported types TreeRowReference(..) , noTreeRowReference , -- * Methods -- ** copy #method:copy# #if ENABLE_OVERLOADING TreeRowReferenceCopyMethodInfo , #endif treeRowReferenceCopy , -- ** deleted #method:deleted# treeRowReferenceDeleted , -- ** free #method:free# #if ENABLE_OVERLOADING TreeRowReferenceFreeMethodInfo , #endif treeRowReferenceFree , -- ** getModel #method:getModel# #if ENABLE_OVERLOADING TreeRowReferenceGetModelMethodInfo , #endif treeRowReferenceGetModel , -- ** getPath #method:getPath# #if ENABLE_OVERLOADING TreeRowReferenceGetPathMethodInfo , #endif treeRowReferenceGetPath , -- ** inserted #method:inserted# treeRowReferenceInserted , -- ** new #method:new# treeRowReferenceNew , -- ** newProxy #method:newProxy# treeRowReferenceNewProxy , -- ** valid #method:valid# #if ENABLE_OVERLOADING TreeRowReferenceValidMethodInfo , #endif treeRowReferenceValid , ) 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.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.Text as T import qualified Data.ByteString.Char8 as B import qualified Data.Map as Map import qualified Foreign.Ptr as FP import qualified GI.GObject.Objects.Object as GObject.Object import {-# SOURCE #-} qualified GI.Gtk.Interfaces.TreeModel as Gtk.TreeModel import {-# SOURCE #-} qualified GI.Gtk.Structs.TreePath as Gtk.TreePath -- | Memory-managed wrapper type. newtype TreeRowReference = TreeRowReference (ManagedPtr TreeRowReference) foreign import ccall "gtk_tree_row_reference_get_type" c_gtk_tree_row_reference_get_type :: IO GType instance BoxedObject TreeRowReference where boxedType _ = c_gtk_tree_row_reference_get_type -- | A convenience alias for `Nothing` :: `Maybe` `TreeRowReference`. noTreeRowReference :: Maybe TreeRowReference noTreeRowReference = Nothing #if ENABLE_OVERLOADING instance O.HasAttributeList TreeRowReference type instance O.AttributeList TreeRowReference = TreeRowReferenceAttributeList type TreeRowReferenceAttributeList = ('[ ] :: [(Symbol, *)]) #endif -- method TreeRowReference::new -- method type : Constructor -- Args : [Arg {argCName = "model", argType = TInterface (Name {namespace = "Gtk", name = "TreeModel"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeModel", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "path", argType = TInterface (Name {namespace = "Gtk", name = "TreePath"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a valid #GtkTreePath-struct to monitor", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TInterface (Name {namespace = "Gtk", name = "TreeRowReference"})) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_new" gtk_tree_row_reference_new :: Ptr Gtk.TreeModel.TreeModel -> -- model : TInterface (Name {namespace = "Gtk", name = "TreeModel"}) Ptr Gtk.TreePath.TreePath -> -- path : TInterface (Name {namespace = "Gtk", name = "TreePath"}) IO (Ptr TreeRowReference) {- | Creates a row reference based on /@path@/. This reference will keep pointing to the node pointed to by /@path@/, so long as it exists. Any changes that occur on /@model@/ are propagated, and the path is updated appropriately. If /@path@/ isn’t a valid path in /@model@/, then 'Nothing' is returned. -} treeRowReferenceNew :: (B.CallStack.HasCallStack, MonadIO m, Gtk.TreeModel.IsTreeModel a) => a {- ^ /@model@/: a 'GI.Gtk.Interfaces.TreeModel.TreeModel' -} -> Gtk.TreePath.TreePath {- ^ /@path@/: a valid 'GI.Gtk.Structs.TreePath.TreePath'-struct to monitor -} -> m TreeRowReference {- ^ __Returns:__ a newly allocated 'GI.Gtk.Structs.TreeRowReference.TreeRowReference', or 'Nothing' -} treeRowReferenceNew model path = liftIO $ do model' <- unsafeManagedPtrCastPtr model path' <- unsafeManagedPtrGetPtr path result <- gtk_tree_row_reference_new model' path' checkUnexpectedReturnNULL "treeRowReferenceNew" result result' <- (wrapBoxed TreeRowReference) result touchManagedPtr model touchManagedPtr path return result' #if ENABLE_OVERLOADING #endif -- method TreeRowReference::new_proxy -- method type : Constructor -- Args : [Arg {argCName = "proxy", argType = TInterface (Name {namespace = "GObject", name = "Object"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a proxy #GObject", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "model", argType = TInterface (Name {namespace = "Gtk", name = "TreeModel"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeModel", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "path", argType = TInterface (Name {namespace = "Gtk", name = "TreePath"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a valid #GtkTreePath-struct to monitor", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TInterface (Name {namespace = "Gtk", name = "TreeRowReference"})) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_new_proxy" gtk_tree_row_reference_new_proxy :: Ptr GObject.Object.Object -> -- proxy : TInterface (Name {namespace = "GObject", name = "Object"}) Ptr Gtk.TreeModel.TreeModel -> -- model : TInterface (Name {namespace = "Gtk", name = "TreeModel"}) Ptr Gtk.TreePath.TreePath -> -- path : TInterface (Name {namespace = "Gtk", name = "TreePath"}) IO (Ptr TreeRowReference) {- | You do not need to use this function. Creates a row reference based on /@path@/. This reference will keep pointing to the node pointed to by /@path@/, so long as it exists. If /@path@/ isn’t a valid path in /@model@/, then 'Nothing' is returned. However, unlike references created with 'GI.Gtk.Structs.TreeRowReference.treeRowReferenceNew', it does not listen to the model for changes. The creator of the row reference must do this explicitly using 'GI.Gtk.Functions.treeRowReferenceInserted', 'GI.Gtk.Functions.treeRowReferenceDeleted', @/gtk_tree_row_reference_reordered()/@. These functions must be called exactly once per proxy when the corresponding signal on the model is emitted. This single call updates all row references for that proxy. Since built-in GTK+ objects like 'GI.Gtk.Objects.TreeView.TreeView' already use this mechanism internally, using them as the proxy object will produce unpredictable results. Further more, passing the same object as /@model@/ and /@proxy@/ doesn’t work for reasons of internal implementation. This type of row reference is primarily meant by structures that need to carefully monitor exactly when a row reference updates itself, and is not generally needed by most applications. -} treeRowReferenceNewProxy :: (B.CallStack.HasCallStack, MonadIO m, GObject.Object.IsObject a, Gtk.TreeModel.IsTreeModel b) => a {- ^ /@proxy@/: a proxy 'GI.GObject.Objects.Object.Object' -} -> b {- ^ /@model@/: a 'GI.Gtk.Interfaces.TreeModel.TreeModel' -} -> Gtk.TreePath.TreePath {- ^ /@path@/: a valid 'GI.Gtk.Structs.TreePath.TreePath'-struct to monitor -} -> m TreeRowReference {- ^ __Returns:__ a newly allocated 'GI.Gtk.Structs.TreeRowReference.TreeRowReference', or 'Nothing' -} treeRowReferenceNewProxy proxy model path = liftIO $ do proxy' <- unsafeManagedPtrCastPtr proxy model' <- unsafeManagedPtrCastPtr model path' <- unsafeManagedPtrGetPtr path result <- gtk_tree_row_reference_new_proxy proxy' model' path' checkUnexpectedReturnNULL "treeRowReferenceNewProxy" result result' <- (wrapBoxed TreeRowReference) result touchManagedPtr proxy touchManagedPtr model touchManagedPtr path return result' #if ENABLE_OVERLOADING #endif -- method TreeRowReference::copy -- method type : OrdinaryMethod -- Args : [Arg {argCName = "reference", argType = TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeRowReference", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TInterface (Name {namespace = "Gtk", name = "TreeRowReference"})) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_copy" gtk_tree_row_reference_copy :: Ptr TreeRowReference -> -- reference : TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}) IO (Ptr TreeRowReference) {- | Copies a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference'. /Since: 2.2/ -} treeRowReferenceCopy :: (B.CallStack.HasCallStack, MonadIO m) => TreeRowReference {- ^ /@reference@/: a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference' -} -> m TreeRowReference {- ^ __Returns:__ a copy of /@reference@/ -} treeRowReferenceCopy reference = liftIO $ do reference' <- unsafeManagedPtrGetPtr reference result <- gtk_tree_row_reference_copy reference' checkUnexpectedReturnNULL "treeRowReferenceCopy" result result' <- (wrapBoxed TreeRowReference) result touchManagedPtr reference return result' #if ENABLE_OVERLOADING data TreeRowReferenceCopyMethodInfo instance (signature ~ (m TreeRowReference), MonadIO m) => O.MethodInfo TreeRowReferenceCopyMethodInfo TreeRowReference signature where overloadedMethod _ = treeRowReferenceCopy #endif -- method TreeRowReference::free -- method type : OrdinaryMethod -- Args : [Arg {argCName = "reference", argType = TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeRowReference, or %NULL", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Nothing -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_free" gtk_tree_row_reference_free :: Ptr TreeRowReference -> -- reference : TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}) IO () {- | Free’s /@reference@/. /@reference@/ may be 'Nothing' -} treeRowReferenceFree :: (B.CallStack.HasCallStack, MonadIO m) => TreeRowReference {- ^ /@reference@/: a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference', or 'Nothing' -} -> m () treeRowReferenceFree reference = liftIO $ do reference' <- unsafeManagedPtrGetPtr reference gtk_tree_row_reference_free reference' touchManagedPtr reference return () #if ENABLE_OVERLOADING data TreeRowReferenceFreeMethodInfo instance (signature ~ (m ()), MonadIO m) => O.MethodInfo TreeRowReferenceFreeMethodInfo TreeRowReference signature where overloadedMethod _ = treeRowReferenceFree #endif -- method TreeRowReference::get_model -- method type : OrdinaryMethod -- Args : [Arg {argCName = "reference", argType = TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeRowReference", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TInterface (Name {namespace = "Gtk", name = "TreeModel"})) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_get_model" gtk_tree_row_reference_get_model :: Ptr TreeRowReference -> -- reference : TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}) IO (Ptr Gtk.TreeModel.TreeModel) {- | Returns the model that the row reference is monitoring. /Since: 2.8/ -} treeRowReferenceGetModel :: (B.CallStack.HasCallStack, MonadIO m) => TreeRowReference {- ^ /@reference@/: a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference' -} -> m Gtk.TreeModel.TreeModel {- ^ __Returns:__ the model -} treeRowReferenceGetModel reference = liftIO $ do reference' <- unsafeManagedPtrGetPtr reference result <- gtk_tree_row_reference_get_model reference' checkUnexpectedReturnNULL "treeRowReferenceGetModel" result result' <- (newObject Gtk.TreeModel.TreeModel) result touchManagedPtr reference return result' #if ENABLE_OVERLOADING data TreeRowReferenceGetModelMethodInfo instance (signature ~ (m Gtk.TreeModel.TreeModel), MonadIO m) => O.MethodInfo TreeRowReferenceGetModelMethodInfo TreeRowReference signature where overloadedMethod _ = treeRowReferenceGetModel #endif -- method TreeRowReference::get_path -- method type : OrdinaryMethod -- Args : [Arg {argCName = "reference", argType = TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeRowReference", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TInterface (Name {namespace = "Gtk", name = "TreePath"})) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_get_path" gtk_tree_row_reference_get_path :: Ptr TreeRowReference -> -- reference : TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}) IO (Ptr Gtk.TreePath.TreePath) {- | Returns a path that the row reference currently points to, or 'Nothing' if the path pointed to is no longer valid. -} treeRowReferenceGetPath :: (B.CallStack.HasCallStack, MonadIO m) => TreeRowReference {- ^ /@reference@/: a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference' -} -> m (Maybe Gtk.TreePath.TreePath) {- ^ __Returns:__ a current path, or 'Nothing' -} treeRowReferenceGetPath reference = liftIO $ do reference' <- unsafeManagedPtrGetPtr reference result <- gtk_tree_row_reference_get_path reference' maybeResult <- convertIfNonNull result $ \result' -> do result'' <- (wrapBoxed Gtk.TreePath.TreePath) result' return result'' touchManagedPtr reference return maybeResult #if ENABLE_OVERLOADING data TreeRowReferenceGetPathMethodInfo instance (signature ~ (m (Maybe Gtk.TreePath.TreePath)), MonadIO m) => O.MethodInfo TreeRowReferenceGetPathMethodInfo TreeRowReference signature where overloadedMethod _ = treeRowReferenceGetPath #endif -- method TreeRowReference::valid -- method type : OrdinaryMethod -- Args : [Arg {argCName = "reference", argType = TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GtkTreeRowReference, or %NULL", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Just (TBasicType TBoolean) -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_valid" gtk_tree_row_reference_valid :: Ptr TreeRowReference -> -- reference : TInterface (Name {namespace = "Gtk", name = "TreeRowReference"}) IO CInt {- | Returns 'True' if the /@reference@/ is non-'Nothing' and refers to a current valid path. -} treeRowReferenceValid :: (B.CallStack.HasCallStack, MonadIO m) => TreeRowReference {- ^ /@reference@/: a 'GI.Gtk.Structs.TreeRowReference.TreeRowReference', or 'Nothing' -} -> m Bool {- ^ __Returns:__ 'True' if /@reference@/ points to a valid path -} treeRowReferenceValid reference = liftIO $ do reference' <- unsafeManagedPtrGetPtr reference result <- gtk_tree_row_reference_valid reference' let result' = (/= 0) result touchManagedPtr reference return result' #if ENABLE_OVERLOADING data TreeRowReferenceValidMethodInfo instance (signature ~ (m Bool), MonadIO m) => O.MethodInfo TreeRowReferenceValidMethodInfo TreeRowReference signature where overloadedMethod _ = treeRowReferenceValid #endif -- method TreeRowReference::deleted -- method type : MemberFunction -- Args : [Arg {argCName = "proxy", argType = TInterface (Name {namespace = "GObject", name = "Object"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GObject", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "path", argType = TInterface (Name {namespace = "Gtk", name = "TreePath"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "the path position that was deleted", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Nothing -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_deleted" gtk_tree_row_reference_deleted :: Ptr GObject.Object.Object -> -- proxy : TInterface (Name {namespace = "GObject", name = "Object"}) Ptr Gtk.TreePath.TreePath -> -- path : TInterface (Name {namespace = "Gtk", name = "TreePath"}) IO () {- | Lets a set of row reference created by 'GI.Gtk.Structs.TreeRowReference.treeRowReferenceNewProxy' know that the model emitted the 'GI.Gtk.Interfaces.TreeModel.TreeModel'::@/row-deleted/@ signal. -} treeRowReferenceDeleted :: (B.CallStack.HasCallStack, MonadIO m, GObject.Object.IsObject a) => a {- ^ /@proxy@/: a 'GI.GObject.Objects.Object.Object' -} -> Gtk.TreePath.TreePath {- ^ /@path@/: the path position that was deleted -} -> m () treeRowReferenceDeleted proxy path = liftIO $ do proxy' <- unsafeManagedPtrCastPtr proxy path' <- unsafeManagedPtrGetPtr path gtk_tree_row_reference_deleted proxy' path' touchManagedPtr proxy touchManagedPtr path return () #if ENABLE_OVERLOADING #endif -- method TreeRowReference::inserted -- method type : MemberFunction -- Args : [Arg {argCName = "proxy", argType = TInterface (Name {namespace = "GObject", name = "Object"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "a #GObject", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing},Arg {argCName = "path", argType = TInterface (Name {namespace = "Gtk", name = "TreePath"}), direction = DirectionIn, mayBeNull = False, argDoc = Documentation {rawDocText = Just "the row position that was inserted", sinceVersion = Nothing}, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}] -- Lengths : [] -- returnType : Nothing -- throws : False -- Skip return : False foreign import ccall "gtk_tree_row_reference_inserted" gtk_tree_row_reference_inserted :: Ptr GObject.Object.Object -> -- proxy : TInterface (Name {namespace = "GObject", name = "Object"}) Ptr Gtk.TreePath.TreePath -> -- path : TInterface (Name {namespace = "Gtk", name = "TreePath"}) IO () {- | Lets a set of row reference created by 'GI.Gtk.Structs.TreeRowReference.treeRowReferenceNewProxy' know that the model emitted the 'GI.Gtk.Interfaces.TreeModel.TreeModel'::@/row-inserted/@ signal. -} treeRowReferenceInserted :: (B.CallStack.HasCallStack, MonadIO m, GObject.Object.IsObject a) => a {- ^ /@proxy@/: a 'GI.GObject.Objects.Object.Object' -} -> Gtk.TreePath.TreePath {- ^ /@path@/: the row position that was inserted -} -> m () treeRowReferenceInserted proxy path = liftIO $ do proxy' <- unsafeManagedPtrCastPtr proxy path' <- unsafeManagedPtrGetPtr path gtk_tree_row_reference_inserted proxy' path' touchManagedPtr proxy touchManagedPtr path return () #if ENABLE_OVERLOADING #endif #if ENABLE_OVERLOADING type family ResolveTreeRowReferenceMethod (t :: Symbol) (o :: *) :: * where ResolveTreeRowReferenceMethod "copy" o = TreeRowReferenceCopyMethodInfo ResolveTreeRowReferenceMethod "free" o = TreeRowReferenceFreeMethodInfo ResolveTreeRowReferenceMethod "valid" o = TreeRowReferenceValidMethodInfo ResolveTreeRowReferenceMethod "getModel" o = TreeRowReferenceGetModelMethodInfo ResolveTreeRowReferenceMethod "getPath" o = TreeRowReferenceGetPathMethodInfo ResolveTreeRowReferenceMethod l o = O.MethodResolutionFailed l o instance (info ~ ResolveTreeRowReferenceMethod t TreeRowReference, O.MethodInfo info TreeRowReference p) => O.IsLabelProxy t (TreeRowReference -> p) where fromLabelProxy _ = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info) #if MIN_VERSION_base(4,9,0) instance (info ~ ResolveTreeRowReferenceMethod t TreeRowReference, O.MethodInfo info TreeRowReference p) => O.IsLabel t (TreeRowReference -> p) where #if MIN_VERSION_base(4,10,0) fromLabel = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info) #else fromLabel _ = O.overloadedMethod (O.MethodProxy :: O.MethodProxy info) #endif #endif #endif