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fix time-travel issue in deletion code
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@ -58,7 +58,7 @@ import Control.Lens
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-- tardis
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import Control.Monad.Trans.Tardis
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( Tardis, TardisT )
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( Tardis )
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import qualified Control.Monad.Trans.Tardis as Tardis
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( TardisT(..)
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, getPast, getFuture, sendPast, sendFuture
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@ -68,8 +68,8 @@ import qualified Control.Monad.Trans.Tardis as Tardis
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import Control.Monad.Trans.Class
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( lift )
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import Control.Monad.Trans.State.Strict
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( StateT(..)
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, State, runState, evalState, get, put, modify'
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( StateT(..), State, runState, evalState
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, get, put, modify
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)
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-- MetaBrush
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@ -296,15 +296,24 @@ data UpdateInfo
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deriving ( Semigroup, Monoid )
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via Generically UpdateInfo
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recordPointUpdate :: Unique -> StrokePoint d -> State UpdateInfo ()
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recordPointUpdate uniq ( PathPoint {} ) = modify'
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( over ( field' @"pathPointsAffected" ) (<>1)
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. over ( field' @"strokesAffected" ) ( Set.insert uniq )
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)
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recordPointUpdate uniq ( ControlPoint {} ) = modify'
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-- Update the info to record a modification.
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--
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-- Needs to be lazy in the given Boolean, to avoid time paradoxes.
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recordPointUpdate :: Monad m => Bool -> Unique -> StrokePoint d -> StateT UpdateInfo m ()
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recordPointUpdate doUpdate uniq ( PathPoint {} ) = modify $
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if doUpdate
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then
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( over ( field' @"pathPointsAffected" ) (<>1)
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. over ( field' @"strokesAffected" ) ( Set.insert uniq )
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)
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else id
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recordPointUpdate doUpdate uniq ( ControlPoint {} ) = modify $
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if doUpdate
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then
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( over ( field' @"controlPointsAffected" ) (<>1)
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. over ( field' @"strokesAffected" ) ( Set.insert uniq )
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)
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else id
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-- | Translate all selected points by the given vector.
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--
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@ -330,7 +339,7 @@ translateSelection mode t doc =
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updateStrokePoint :: HasType FocusState pt => Unique -> StrokePoint pt -> State UpdateInfo ( StrokePoint pt )
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updateStrokePoint uniq pt
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| Selected <- view _selection pt
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= recordPointUpdate uniq pt
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= recordPointUpdate True uniq pt
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$> pt { coords = t • coords pt }
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| otherwise
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= pure pt
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@ -339,16 +348,15 @@ translateSelection mode t doc =
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--
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-- Returns the updated document, together with info about how many points were deleted.
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deleteSelected :: Mode -> Document -> ( Document, UpdateInfo )
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deleteSelected mode doc = ( newDoc, updateInfo )
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deleteSelected mode doc = deletionResult
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where
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newDoc :: Document
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updateInfo :: UpdateInfo
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( ( newDoc, _ ), updateInfo )
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= runIdentity . ( `runStateT` mempty ) . ( `Tardis.runTardisT` ( False, False ) )
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deletionResult :: ( Document, UpdateInfo )
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deletionResult
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= fst . runIdentity . ( `Tardis.runTardisT` ( False, False ) ) . ( `runStateT` mempty )
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$ ( field' @"documentContent" . field' @"strokes" . traverse ) updateStroke doc
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updateStroke :: Stroke -> TardisT Bool Bool ( State UpdateInfo ) Stroke
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updateStroke :: Stroke -> StateT UpdateInfo ( Tardis Bool Bool ) Stroke
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updateStroke stroke@( Stroke { strokeVisible, strokeUnique } )
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| not strokeVisible
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= pure stroke
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@ -365,24 +373,24 @@ deleteSelected mode doc = ( newDoc, updateInfo )
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:: forall pt
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. HasType FocusState pt
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=> Unique -> Seq ( StrokePoint pt )
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-> TardisT Bool Bool ( State UpdateInfo ) ( Seq ( StrokePoint pt ) )
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-> StateT UpdateInfo ( Tardis Bool Bool ) ( Seq ( StrokePoint pt ) )
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updateStrokePoints _ Empty = pure Empty
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updateStrokePoints uniq ( p :<| ps ) = case p of
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PathPoint {}
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| Selected <- selectionState
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-> do
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Tardis.sendPast True
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Tardis.sendFuture True
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lift ( recordPointUpdate uniq p )
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lift ( Tardis.sendPast True )
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lift ( Tardis.sendFuture True )
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recordPointUpdate True uniq p
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updateStrokePoints uniq ps
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| otherwise
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-> do
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Tardis.sendPast False
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Tardis.sendFuture False
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lift ( Tardis.sendPast False )
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lift ( Tardis.sendFuture False )
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( p :<| ) <$> updateStrokePoints uniq ps
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_ -> do
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prevPathPointDeleted <- Tardis.getPast
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nextPathPointDeleted <- Tardis.getFuture
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prevPathPointDeleted <- lift Tardis.getPast
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nextPathPointDeleted <- lift Tardis.getFuture
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rest <- updateStrokePoints uniq ps
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let
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-- Control point must be deleted:
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@ -391,17 +399,13 @@ deleteSelected mode doc = ( newDoc, updateInfo )
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-- - if the next path point is going to be deleted.
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--
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-- Need to be lazy in "nextPathPointDeleted" to avoid looping.
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res :: Seq ( StrokePoint pt )
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stateAction :: State UpdateInfo ()
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( res, stateAction )
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| selectionState == Selected
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needsDeletion :: Bool
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needsDeletion
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= selectionState == Selected
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|| prevPathPointDeleted
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|| nextPathPointDeleted
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= ( rest, recordPointUpdate uniq p )
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| otherwise
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= ( p :<| rest, pure () )
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lift stateAction
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pure res
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recordPointUpdate needsDeletion uniq p
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pure $ if needsDeletion then rest else ( p :<| rest )
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where
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selectionState :: FocusState
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selectionState = view _selection p
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