@@ -2,136 +2,41 @@
22Module: Reflex.Vty.Widget
33Description: Basic set of widgets and building blocks for reflex-vty applications
44-}
5−{-# LANGUAGE DeriveFunctor #-}
6−{-# LANGUAGE FlexibleContexts #-}
7−{-# LANGUAGE FlexibleInstances #-}
8−{-# LANGUAGE FunctionalDependencies #-}
9−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
10−{-# LANGUAGE LambdaCase #-}
11−{-# LANGUAGE MultiParamTypeClasses #-}
12−{-# LANGUAGE OverloadedStrings #-}
13−{-# LANGUAGE RankNTypes #-}
14−{-# LANGUAGE RecursiveDo #-}
15−{-# LANGUAGE ScopedTypeVariables #-}
16−{-# LANGUAGE StandaloneDeriving #-}
17−{-# LANGUAGE TupleSections #-}
18−{-# LANGUAGE TypeFamilies #-}
19−{-# LANGUAGE UndecidableInstances #-}
20−module Reflex.Vty.Widget
21− ( VtyWidgetCtx(..)
22− , VtyWidget(..)
23− , VtyWidgetOut(..)
24− , ImageWriter(..)
25− , runVtyWidget
26− , mainWidget
27− , mainWidgetWithHandle
28−
29− , StackWidget(..)
30− , stack
31− , Direction(..)
32− , col
33− , row
34− , sized
35−
36− , HasDisplaySize(..)
37− , HasFocus(..)
38− , HasVtyInput(..)
39− , DynRegion(..)
40− , currentRegion
41− , Region(..)
42− , regionSize
43− , regionBlankImage
44− , Drag(..)
45− , drag
46− , MouseDown(..)
47− , MouseUp(..)
48− , mouseDown
49− , mouseUp
50− , pane
51− , splitV
52− , splitVDrag
53− , box
54− , boxStatic
55− , RichTextConfig(..)
56− , richText
57− , text
58− , display
59− , BoxStyle(..)
60− , hyphenBoxStyle
61− , singleBoxStyle
62− , roundedBoxStyle
63− , thickBoxStyle
64− , doubleBoxStyle
65− , fill
66− , hRule
67− ) where
5+{-# Language UndecidableInstances #-}
6+
7+module Reflex.Vty.Widget where
688
699import Control.Applicative (liftA2)
70−import Control.Monad (ap)
7110import Control.Monad.Fix (MonadFix)
72−import Control.Monad.Trans (lift)
73−import Control.Monad.Trans.Reader (ReaderT, runReaderT, asks, ask)
74−import Data.Default (Default(..))
75−import Data.Text (Text)
76−import qualified Data.Text as T
77−import qualified Data.Text.Zipper as TZ
11+import Control.Monad.IO.Class (MonadIO)
12+import Control.Monad.Morph
13+import Control.Monad.NodeId
14+import Control.Monad.Reader (ReaderT, ask, local, runReaderT)
15+import Control.Monad.Ref
16+import Control.Monad.Trans (MonadTrans, lift)
17+import Data.Set (Set)
18+import qualified Data.Set as Set
7819import Graphics.Vty (Image)
7920import qualified Graphics.Vty as V
8021import Reflex
81−import Reflex.Class.Orphans ()
82−import Reflex.NotReady.Class
83−import Reflex.NotReady.Class.Orphans ()
84−
22+import Reflex.Class ()
23+import Reflex.Host.Class (MonadReflexCreateTrigger)
8524import Reflex.Vty.Host
8625
87−-- | The context within which a 'VtyWidget' runs
88−data VtyWidgetCtx t = VtyWidgetCtx
89− { _vtyWidgetCtx_width :: Dynamic t Int
90− -- ^ The width of the region allocated to the widget.
91− , _vtyWidgetCtx_height :: Dynamic t Int
92− -- ^ The height of the region allocated to the widget.
93− , _vtyWidgetCtx_focus :: Dynamic t Bool
94− -- ^ Whether the widget should behave as if it has focus for keyboard input.
95− , _vtyWidgetCtx_input :: Event t VtyEvent
96− -- ^ User input events that the widget's parent chooses to share. These will generally
97− -- be filtered for relevance:
98− -- * Keyboard inputs are restricted to focused widgets
99− -- * Mouse inputs are restricted to the region in which the widget resides and are
100− -- translated into its internal coordinates.
101− }
102−
103−-- | The output of a 'VtyWidget'
104−data VtyWidgetOut t = VtyWidgetOut
105− { _vtyWidgetOut_shutdown :: Event t ()
106− }
107−
108−instance (Adjustable t m, MonadHold t m, Reflex t) => Adjustable t (VtyWidget t m) where
109− runWithReplace a0 a' = VtyWidget $ runWithReplace (unVtyWidget a0) $ fmap unVtyWidget a'
110− traverseIntMapWithKeyWithAdjust f dm0 dm' = VtyWidget $
111− traverseIntMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
112− traverseDMapWithKeyWithAdjust f dm0 dm' = VtyWidget $ do
113− traverseDMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
114− traverseDMapWithKeyWithAdjustWithMove f dm0 dm' = VtyWidget $ do
115− traverseDMapWithKeyWithAdjustWithMove (\k v -> unVtyWidget (f k v)) dm0 dm'
116−
117−-- | A widget that can read its context and produce image output
118−newtype VtyWidget t m a = VtyWidget
119− { unVtyWidget :: BehaviorWriterT t [Image] (ReaderT (VtyWidgetCtx t) m) a
120− }
121− deriving (Functor, Applicative, Monad, MonadSample t, MonadHold t, MonadFix, NotReady t, ImageWriter t)
122−
123−-- | Runs a 'VtyWidget' with a given context
124−runVtyWidget
125− :: (Reflex t, Monad m)
126− => VtyWidgetCtx t
127− -> VtyWidget t m a
128− -> m (a, Behavior t [Image])
129−runVtyWidget ctx w = runReaderT (runBehaviorWriterT (unVtyWidget w)) ctx
26+-- * Running a vty application
13027
131−-- | Sets up the top-level context for a 'VtyWidget' and runs it with that context
28+-- | Sets up the top-level context for a vty widget and runs it with that context
13229mainWidgetWithHandle
13330 :: V.Vty
134− -> (forall t m. MonadVtyApp t m => VtyWidget t m (Event t ()))
31+ -> (forall t m.
32+ ( MonadVtyApp t m
33+ , HasImageWriter t m
34+ , MonadNodeId m
35+ , HasDisplayRegion t m
36+ , HasFocusReader t m
37+ , HasInput t m
38+ , HasTheme t m
39+ ) => m (Event t ()))
13540 -> IO ()
13641mainWidgetWithHandle vty child =
13742 runVtyAppWithHandle vty $ \dr0 inp -> do
@@ -141,60 +46,178 @@ mainWidgetWithHandle vty child =
14146 let inp' = fforMaybe inp $ \case
14247 V.EvResize {} -> Nothing
14348 x -> Just x
144− let ctx = VtyWidgetCtx
145− { _vtyWidgetCtx_width = fmap fst size
146− , _vtyWidgetCtx_height = fmap snd size
147− , _vtyWidgetCtx_input = inp'
148− , _vtyWidgetCtx_focus = constDyn True
149− }
150− (shutdown, images) <- runVtyWidget ctx $ do
151− tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
152− child
49+ (shutdown, images) <- runThemeReader (constant V.defAttr) $
50+ runFocusReader (pure True) $
51+ runDisplayRegion (fmap (\(w, h) -> Region 0 0 w h) size) $
52+ runImageWriter $
53+ runNodeIdT $
54+ runInput inp' $ do
55+ tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
56+ child
15357 return $ VtyResult
15458 { _vtyResult_picture = fmap (V.picForLayers . reverse) images
15559 , _vtyResult_shutdown = shutdown
15660 }
15761
62+-- | The output of a vty widget
63+data VtyWidgetOut t = VtyWidgetOut
64+ { _vtyWidgetOut_shutdown :: Event t ()
65+ }
66+
15867-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
15968mainWidget
160− :: (forall t m. MonadVtyApp t m => VtyWidget t m (Event t ()))
69+ :: (forall t m.
70+ ( MonadVtyApp t m
71+ , HasImageWriter t m
72+ , MonadNodeId m
73+ , HasDisplayRegion t m
74+ , HasFocusReader t m
75+ , HasTheme t m
76+ , HasInput t m
77+ ) => m (Event t ()))
16178 -> IO ()
16279mainWidget child = do
16380 vty <- getDefaultVty
16481 mainWidgetWithHandle vty child
16582
166−-- | A class for things that know their own display size dimensions
167−class (Reflex t, Monad m) => HasDisplaySize t m | m -> t where
168− -- | Retrieve the display width (columns)
169− displayWidth :: m (Dynamic t Int)
170− -- | Retrieve the display height (rows)
171− displayHeight :: m (Dynamic t Int)
172−
173−instance (Reflex t, Monad m) => HasDisplaySize t (VtyWidget t m) where
174− displayWidth = VtyWidget . lift $ asks _vtyWidgetCtx_width
175− displayHeight = VtyWidget . lift $ asks _vtyWidgetCtx_height
83+-- * Input Events
17684
17785-- | A class for things that can receive vty events as input
178−class HasVtyInput t m | m -> t where
86+class HasInput t m | m -> t where
17987 input :: m (Event t VtyEvent)
88+ default input :: (f m' ~ m, Monad m', MonadTrans f, HasInput t m') => m (Event t VtyEvent)
89+ input = lift input
90+ -- | User input events that the widget's parent chooses to share. These will generally
91+ -- be filtered for relevance.
92+ localInput :: (Event t VtyEvent -> Event t VtyEvent) -> m a -> m a
93+ default localInput :: (f m' ~ m, Monad m', MFunctor f, HasInput t m') => (Event t VtyEvent -> Event t VtyEvent) -> m a -> m a
94+ localInput f = hoist (localInput f)
95+
96+instance (Reflex t, Monad m) => HasInput t (Input t m) where
97+ input = Input ask
98+ localInput f (Input m) = Input $ local f m
99+
100+-- | A widget that can receive input events. See 'Graphics.Vty.Event'
101+newtype Input t m a = Input
102+ { unInput :: ReaderT (Event t VtyEvent) m a
103+ } deriving
104+ ( Functor
105+ , Applicative
106+ , Monad
107+ , MonadSample t
108+ , MonadHold t
109+ , MonadFix
110+ , MonadIO
111+ , MonadRef
112+ )
113+
114+instance (Adjustable t m, MonadHold t m, Reflex t) => Adjustable t (Input t m) where
115+ runWithReplace a0 a' = Input $ runWithReplace (unInput a0) $ fmap unInput a'
116+ traverseIntMapWithKeyWithAdjust f dm0 dm' = Input $
117+ traverseIntMapWithKeyWithAdjust (\k v -> unInput (f k v)) dm0 dm'
118+ traverseDMapWithKeyWithAdjust f dm0 dm' = Input $ do
119+ traverseDMapWithKeyWithAdjust (\k v -> unInput (f k v)) dm0 dm'
120+ traverseDMapWithKeyWithAdjustWithMove f dm0 dm' = Input $ do
121+ traverseDMapWithKeyWithAdjustWithMove (\k v -> unInput (f k v)) dm0 dm'
122+
123+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (Input t m)
124+deriving instance NotReady t m => NotReady t (Input t m)
125+deriving instance PerformEvent t m => PerformEvent t (Input t m)
126+deriving instance PostBuild t m => PostBuild t (Input t m)
127+deriving instance TriggerEvent t m => TriggerEvent t (Input t m)
128+instance HasImageWriter t m => HasImageWriter t (Input t m)
129+instance HasDisplayRegion t m => HasDisplayRegion t (Input t m)
130+instance HasFocusReader t m => HasFocusReader t (Input t m)
131+
132+instance MonadTrans (Input t) where
133+ lift f = Input $ lift f
134+
135+instance MFunctor (Input t) where
136+ hoist f = Input . hoist f . unInput
137+
138+instance MonadNodeId m => MonadNodeId (Input t m)
139+
140+-- | Runs an 'Input' with a given context
141+runInput
142+ :: Reflex t
143+ => Event t VtyEvent
144+ -> Input t m a
145+ -> m a
146+runInput e w = runReaderT (unInput w) e
147+
148+-- ** Filtering input
149+
150+-- | Type synonym for a key and modifier combination
151+type KeyCombo = (V.Key, [V.Modifier])
152+
153+-- | Emits an event that fires on a particular key press (without modifiers)
154+key :: (Monad m, Reflex t, HasInput t m) => V.Key -> m (Event t KeyCombo)
155+key = keyCombos . Set.singleton . (,[])
156+
157+-- | Emits an event that fires on particular key presses (without modifiers)
158+keys :: (Monad m, Reflex t, HasInput t m) => [V.Key] -> m (Event t KeyCombo)
159+keys = keyCombos . Set.fromList . fmap (,[])
160+
161+-- | Emit an event that fires whenever the provided key combination occurs
162+keyCombo
163+ :: (Reflex t, Monad m, HasInput t m)
164+ => KeyCombo
165+ -> m (Event t KeyCombo)
166+keyCombo = keyCombos . Set.singleton
167+
168+-- | Emit an event that fires whenever any of the provided key combinations occur
169+keyCombos
170+ :: (Reflex t, Monad m, HasInput t m)
171+ => Set KeyCombo
172+ -> m (Event t KeyCombo)
173+keyCombos ks = do
174+ i <- input
175+ return $ fforMaybe i $ \case
176+ V.EvKey k m -> if Set.member (k, m) ks
177+ then Just (k, m)
178+ else Nothing
179+ _ -> Nothing
180180
181−instance (Reflex t, Monad m) => HasVtyInput t (VtyWidget t m) where
182− input = VtyWidget . lift $ asks _vtyWidgetCtx_input
183−
184−-- | A class for things that can dynamically gain and lose focus
185−class HasFocus t m | m -> t where
186− focus :: m (Dynamic t Bool)
187−
188−instance (Reflex t, Monad m) => HasFocus t (VtyWidget t m) where
189− focus = VtyWidget . lift $ asks _vtyWidgetCtx_focus
190−
191−-- | A class for widgets that can produce images to draw to the display
192−class (Reflex t, Monad m) => ImageWriter t m | m -> t where
193− -- | Send images upstream for rendering
194− tellImages :: Behavior t [Image] -> m ()
181+-- | Filter the keyboard input that a child widget may receive
182+filterKeys :: (Reflex t, HasInput t m) => (KeyCombo -> Bool) -> m a -> m a
183+filterKeys f x = localInput (ffilter (\case
184+ V.EvKey k mods -> f (k, mods)
185+ _ -> True)) x
186+
187+-- | Filter mouse input events based on whether they target a particular region
188+-- and translate them to the internal coordinate system of that region.
189+--
190+-- NB: Non-mouse events are passed through unfiltered and unchanged
191+mouseInRegion :: Region -> VtyEvent -> Maybe VtyEvent
192+mouseInRegion (Region l t w h) e = case e of
193+ V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
194+ V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
195+ _ -> Just e
196+ where
197+ mouse con x y
198+ | or [ x < l
199+ , y < t
200+ , x >= l + w
201+ , y >= t + h ] = Nothing
202+ | otherwise =
203+ Just (con (x - l) (y - t))
204+
205+-- | Filter mouse input outside the current display region and
206+-- all input if the region is not focused
207+inputInFocusedRegion
208+ :: (HasDisplayRegion t m, HasFocusReader t m, HasInput t m)
209+ => m (Event t VtyEvent)
210+inputInFocusedRegion = do
211+ inp <- input
212+ reg <- current <$> askRegion
213+ foc <- current <$> focus
214+ pure $ fmapMaybe id $ attachWith filterInput ((,) <$> reg <*> foc) inp
215+ where
216+ filterInput (r, f) = \case
217+ V.EvKey {} | not f -> Nothing
218+ x -> mouseInRegion r x
195219
196−instance (Monad m, Reflex t) => ImageWriter t (BehaviorWriterT t [Image] m) where
197− tellImages = tellBehavior
220+-- * Getting and setting the display region
198221
199222-- | A chunk of the display area
200223data Region = Region
@@ -205,26 +228,293 @@ data Region = Region
205228 }
206229 deriving (Show, Read, Eq, Ord)
207230
208−-- | A dynamic chunk of the display area
209−data DynRegion t = DynRegion
210− { _dynRegion_left :: Dynamic t Int
211− , _dynRegion_top :: Dynamic t Int
212− , _dynRegion_width :: Dynamic t Int
213− , _dynRegion_height :: Dynamic t Int
214− }
231+-- | A region that occupies no space.
232+nilRegion :: Region
233+nilRegion = Region 0 0 0 0
215234
216235-- | The width and height of a 'Region'
217236regionSize :: Region -> (Int, Int)
218237regionSize (Region _ _ w h) = (w, h)
219238
220239-- | Produces an 'Image' that fills a region with space characters
221−regionBlankImage :: Region -> Image
222−regionBlankImage r@(Region _ _ width height) =
223− withinImage r $ V.charFill V.defAttr ' ' width height
240+regionBlankImage :: V.Attr -> Region -> Image
241+regionBlankImage attr r@(Region _ _ width height) =
242+ withinImage r $ V.charFill attr ' ' width height
243+
244+-- | A class for things that know their own display size dimensions
245+class (Reflex t, Monad m) => HasDisplayRegion t m | m -> t where
246+ -- | Retrieve the display region
247+ askRegion :: m (Dynamic t Region)
248+ default askRegion :: (f m' ~ m, MonadTrans f, HasDisplayRegion t m') => m (Dynamic t Region)
249+ askRegion = lift askRegion
250+ -- | Run an action in a local region, by applying a transformation to the region
251+ localRegion :: (Dynamic t Region -> Dynamic t Region) -> m a -> m a
252+ default localRegion :: (f m' ~ m, Monad m', MFunctor f, HasDisplayRegion t m') => (Dynamic t Region -> Dynamic t Region) -> m a -> m a
253+ localRegion f = hoist (localRegion f)
254+
255+-- | Retrieve the display width
256+displayWidth :: HasDisplayRegion t m => m (Dynamic t Int)
257+displayWidth = fmap _region_width <$> askRegion
258+
259+-- | Retrieve the display height
260+displayHeight :: HasDisplayRegion t m => m (Dynamic t Int)
261+displayHeight = fmap _region_height <$> askRegion
262+
263+instance HasDisplayRegion t m => HasDisplayRegion t (ReaderT x m)
264+instance HasDisplayRegion t m => HasDisplayRegion t (BehaviorWriterT t x m)
265+instance HasDisplayRegion t m => HasDisplayRegion t (DynamicWriterT t x m)
266+instance HasDisplayRegion t m => HasDisplayRegion t (EventWriterT t x m)
267+instance HasDisplayRegion t m => HasDisplayRegion t (NodeIdT m)
268+
269+-- | A widget that has access to a particular region of the vty display
270+newtype DisplayRegion t m a = DisplayRegion
271+ { unDisplayRegion :: ReaderT (Dynamic t Region) m a }
272+ deriving
273+ ( Functor
274+ , Applicative
275+ , Monad
276+ , MonadFix
277+ , MonadHold t
278+ , MonadIO
279+ , MonadRef
280+ , MonadSample t
281+ )
282+
283+instance (Monad m, Reflex t) => HasDisplayRegion t (DisplayRegion t m) where
284+ askRegion = DisplayRegion ask
285+ localRegion f = DisplayRegion . local f . unDisplayRegion
286+
287+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (DisplayRegion t m)
288+deriving instance NotReady t m => NotReady t (DisplayRegion t m)
289+deriving instance PerformEvent t m => PerformEvent t (DisplayRegion t m)
290+deriving instance PostBuild t m => PostBuild t (DisplayRegion t m)
291+deriving instance TriggerEvent t m => TriggerEvent t (DisplayRegion t m)
292+instance HasImageWriter t m => HasImageWriter t (DisplayRegion t m)
293+instance HasFocusReader t m => HasFocusReader t (DisplayRegion t m)
294+
295+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (DisplayRegion t m) where
296+ runWithReplace (DisplayRegion a) e = DisplayRegion $ runWithReplace a $ fmap unDisplayRegion e
297+ traverseIntMapWithKeyWithAdjust f m e = DisplayRegion $ traverseIntMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
298+ traverseDMapWithKeyWithAdjust f m e = DisplayRegion $ traverseDMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
299+ traverseDMapWithKeyWithAdjustWithMove f m e = DisplayRegion $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unDisplayRegion $ f k v) m e
300+
301+instance MonadTrans (DisplayRegion t) where
302+ lift = DisplayRegion . lift
303+
304+instance MFunctor (DisplayRegion t) where
305+ hoist f = DisplayRegion . hoist f . unDisplayRegion
306+
307+instance MonadNodeId m => MonadNodeId (DisplayRegion t m)
308+
309+-- | Run a 'DisplayRegion' action with a given 'Region'
310+runDisplayRegion
311+ :: (Reflex t, Monad m)
312+ => Dynamic t Region
313+ -> DisplayRegion t m a
314+ -> m a
315+runDisplayRegion r = flip runReaderT r . unDisplayRegion
316+
317+-- * Getting focus state
224318
225−-- | A behavior of the current display area represented by a 'DynRegion'
226−currentRegion :: Reflex t => DynRegion t -> Behavior t Region
227−currentRegion (DynRegion l t w h) = Region <$> current l <*> current t <*> current w <*> current h
319+-- | A class for things that can dynamically gain and lose focus
320+class (Reflex t, Monad m) => HasFocusReader t m | m -> t where
321+ focus :: m (Dynamic t Bool)
322+ default focus :: (f m' ~ m, Monad m', MonadTrans f, HasFocusReader t m') => m (Dynamic t Bool)
323+ focus = lift focus
324+ localFocus :: (Dynamic t Bool -> Dynamic t Bool) -> m a -> m a
325+ default localFocus :: (f m' ~ m, Monad m', MFunctor f, HasFocusReader t m') => (Dynamic t Bool -> Dynamic t Bool) -> m a -> m a
326+ localFocus f = hoist (localFocus f)
327+
328+instance HasFocusReader t m => HasFocusReader t (ReaderT x m)
329+instance HasFocusReader t m => HasFocusReader t (BehaviorWriterT t x m)
330+instance HasFocusReader t m => HasFocusReader t (DynamicWriterT t x m)
331+instance HasFocusReader t m => HasFocusReader t (EventWriterT t x m)
332+instance HasFocusReader t m => HasFocusReader t (NodeIdT m)
333+
334+-- | A widget that has access to information about whether it is focused
335+newtype FocusReader t m a = FocusReader
336+ { unFocusReader :: ReaderT (Dynamic t Bool) m a }
337+ deriving
338+ ( Functor
339+ , Applicative
340+ , Monad
341+ , MonadFix
342+ , MonadHold t
343+ , MonadIO
344+ , MonadRef
345+ , MonadSample t
346+ )
347+
348+instance (Monad m, Reflex t) => HasFocusReader t (FocusReader t m) where
349+ focus = FocusReader ask
350+ localFocus f = FocusReader . local f . unFocusReader
351+
352+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (FocusReader t m)
353+deriving instance NotReady t m => NotReady t (FocusReader t m)
354+deriving instance PerformEvent t m => PerformEvent t (FocusReader t m)
355+deriving instance PostBuild t m => PostBuild t (FocusReader t m)
356+deriving instance TriggerEvent t m => TriggerEvent t (FocusReader t m)
357+instance HasImageWriter t m => HasImageWriter t (FocusReader t m)
358+
359+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (FocusReader t m) where
360+ runWithReplace (FocusReader a) e = FocusReader $ runWithReplace a $ fmap unFocusReader e
361+ traverseIntMapWithKeyWithAdjust f m e = FocusReader $ traverseIntMapWithKeyWithAdjust (\k v -> unFocusReader $ f k v) m e
362+ traverseDMapWithKeyWithAdjust f m e = FocusReader $ traverseDMapWithKeyWithAdjust (\k v -> unFocusReader $ f k v) m e
363+ traverseDMapWithKeyWithAdjustWithMove f m e = FocusReader $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unFocusReader $ f k v) m e
364+
365+instance MonadTrans (FocusReader t) where
366+ lift = FocusReader . lift
367+
368+instance MFunctor (FocusReader t) where
369+ hoist f = FocusReader . hoist f . unFocusReader
370+
371+instance MonadNodeId m => MonadNodeId (FocusReader t m)
372+
373+-- | Run a 'FocusReader' action with the given focus value
374+runFocusReader
375+ :: (Reflex t, Monad m)
376+ => Dynamic t Bool
377+ -> FocusReader t m a
378+ -> m a
379+runFocusReader b = flip runReaderT b . unFocusReader
380+
381+-- * "Image" output
382+
383+-- | A class for widgets that can produce images to draw to the display
384+class (Reflex t, Monad m) => HasImageWriter t m | m -> t where
385+ -- | Send images upstream for rendering
386+ tellImages :: Behavior t [Image] -> m ()
387+ default tellImages :: (f m' ~ m, Monad m', MonadTrans f, HasImageWriter t m') => Behavior t [Image] -> m ()
388+ tellImages = lift . tellImages
389+ -- | Apply a transformation to the images produced by the child actions
390+ mapImages :: (Behavior t [Image] -> Behavior t [Image]) -> m a -> m a
391+ default mapImages :: (f m' ~ m, Monad m', MFunctor f, HasImageWriter t m') => (Behavior t [Image] -> Behavior t [Image]) -> m a -> m a
392+ mapImages f = hoist (mapImages f)
393+
394+-- | A widget that can produce images to draw onto the display
395+newtype ImageWriter t m a = ImageWriter
396+ { unImageWriter :: BehaviorWriterT t [Image] m a }
397+ deriving
398+ ( Functor
399+ , Applicative
400+ , Monad
401+ , MonadFix
402+ , MonadHold t
403+ , MonadIO
404+ , MonadRef
405+ , MonadReflexCreateTrigger t
406+ , MonadSample t
407+ , NotReady t
408+ , PerformEvent t
409+ , PostBuild t
410+ , TriggerEvent t
411+ )
412+
413+instance MonadTrans (ImageWriter t) where
414+ lift = ImageWriter . lift
415+
416+instance MFunctor (ImageWriter t) where
417+ hoist f = ImageWriter . (hoist f) . unImageWriter
418+
419+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (ImageWriter t m) where
420+ runWithReplace (ImageWriter a) e = ImageWriter $ runWithReplace a $ fmap unImageWriter e
421+ traverseIntMapWithKeyWithAdjust f m e = ImageWriter $ traverseIntMapWithKeyWithAdjust (\k v -> unImageWriter $ f k v) m e
422+ traverseDMapWithKeyWithAdjust f m e = ImageWriter $ traverseDMapWithKeyWithAdjust (\k v -> unImageWriter $ f k v) m e
423+ traverseDMapWithKeyWithAdjustWithMove f m e = ImageWriter $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unImageWriter $ f k v) m e
424+
425+instance HasImageWriter t m => HasImageWriter t (ReaderT x m)
426+instance HasImageWriter t m => HasImageWriter t (BehaviorWriterT t x m)
427+instance HasImageWriter t m => HasImageWriter t (DynamicWriterT t x m)
428+instance HasImageWriter t m => HasImageWriter t (EventWriterT t x m)
429+instance HasImageWriter t m => HasImageWriter t (NodeIdT m)
430+
431+instance (Monad m, Reflex t) => HasImageWriter t (ImageWriter t m) where
432+ tellImages = ImageWriter . tellBehavior
433+ mapImages f (ImageWriter x) = ImageWriter $ do
434+ (a, images) <- lift $ runBehaviorWriterT x
435+ tellBehavior $ f images
436+ pure a
437+
438+instance HasDisplayRegion t m => HasDisplayRegion t (ImageWriter t m)
439+instance HasFocusReader t m => HasFocusReader t (ImageWriter t m)
440+
441+-- | Run a widget that can produce images
442+runImageWriter
443+ :: (Reflex t, Monad m)
444+ => ImageWriter t m a
445+ -> m (a, Behavior t [Image])
446+runImageWriter = runBehaviorWriterT . unImageWriter
447+
448+-- * Theming
449+
450+-- | A class for things that can be visually styled
451+class (Reflex t, Monad m) => HasTheme t m | m -> t where
452+ theme :: m (Behavior t V.Attr)
453+ default theme :: (f m' ~ m, Monad m', MonadTrans f, HasTheme t m') => m (Behavior t V.Attr)
454+ theme = lift theme
455+ localTheme :: (Behavior t V.Attr -> Behavior t V.Attr) -> m a -> m a
456+ default localTheme :: (f m' ~ m, Monad m', MFunctor f, HasTheme t m') => (Behavior t V.Attr -> Behavior t V.Attr) -> m a -> m a
457+ localTheme f = hoist (localTheme f)
458+
459+instance HasTheme t m => HasTheme t (ReaderT x m)
460+instance HasTheme t m => HasTheme t (BehaviorWriterT t x m)
461+instance HasTheme t m => HasTheme t (DynamicWriterT t x m)
462+instance HasTheme t m => HasTheme t (EventWriterT t x m)
463+instance HasTheme t m => HasTheme t (NodeIdT m)
464+instance HasTheme t m => HasTheme t (Input t m)
465+instance HasTheme t m => HasTheme t (ImageWriter t m)
466+instance HasTheme t m => HasTheme t (DisplayRegion t m)
467+instance HasTheme t m => HasTheme t (FocusReader t m)
468+
469+-- | A widget that has access to theme information
470+newtype ThemeReader t m a = ThemeReader
471+ { unThemeReader :: ReaderT (Behavior t V.Attr) m a }
472+ deriving
473+ ( Functor
474+ , Applicative
475+ , Monad
476+ , MonadFix
477+ , MonadHold t
478+ , MonadIO
479+ , MonadRef
480+ , MonadSample t
481+ )
482+
483+instance (Monad m, Reflex t) => HasTheme t (ThemeReader t m) where
484+ theme = ThemeReader ask
485+ localTheme f = ThemeReader . local f . unThemeReader
486+
487+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (ThemeReader t m)
488+deriving instance NotReady t m => NotReady t (ThemeReader t m)
489+deriving instance PerformEvent t m => PerformEvent t (ThemeReader t m)
490+deriving instance PostBuild t m => PostBuild t (ThemeReader t m)
491+deriving instance TriggerEvent t m => TriggerEvent t (ThemeReader t m)
492+instance HasImageWriter t m => HasImageWriter t (ThemeReader t m)
493+
494+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (ThemeReader t m) where
495+ runWithReplace (ThemeReader a) e = ThemeReader $ runWithReplace a $ fmap unThemeReader e
496+ traverseIntMapWithKeyWithAdjust f m e = ThemeReader $ traverseIntMapWithKeyWithAdjust (\k v -> unThemeReader $ f k v) m e
497+ traverseDMapWithKeyWithAdjust f m e = ThemeReader $ traverseDMapWithKeyWithAdjust (\k v -> unThemeReader $ f k v) m e
498+ traverseDMapWithKeyWithAdjustWithMove f m e = ThemeReader $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unThemeReader $ f k v) m e
499+
500+instance MonadTrans (ThemeReader t) where
501+ lift = ThemeReader . lift
502+
503+instance MFunctor (ThemeReader t) where
504+ hoist f = ThemeReader . hoist f . unThemeReader
505+
506+instance MonadNodeId m => MonadNodeId (ThemeReader t m)
507+
508+-- | Run a 'ThemeReader' action with the given focus value
509+runThemeReader
510+ :: (Reflex t, Monad m)
511+ => Behavior t V.Attr
512+ -> ThemeReader t m a
513+ -> m a
514+runThemeReader b = flip runReaderT b . unThemeReader
515+
516+
517+-- ** Manipulating images
228518
229519-- | Translates and crops an 'Image' so that it is contained by
230520-- the given 'Region'.
@@ -236,7 +526,17 @@ withinImage (Region left top width height)
236526 | width < 0 || height < 0 = withinImage (Region left top 0 0)
237527 | otherwise = V.translate left top . V.crop width height
238528
239−-- | Low-level widget combinator that runs a child 'VtyWidget' within
529+-- | Crop a behavior of images to a behavior of regions. See 'withinImage'.
530+imagesInRegion
531+ :: Reflex t
532+ => Behavior t Region
533+ -> Behavior t [Image]
534+ -> Behavior t [Image]
535+imagesInRegion reg = liftA2 (\r is -> map (withinImage r) is) reg
536+
537+-- * Running sub-widgets
538+
539+-- | Low-level widget combinator that runs a child widget within
240540-- a given region and context. This widget filters and modifies the input
241541-- that the child widget receives such that:
242542-- * unfocused widgets receive no key events
@@ -244,388 +544,18 @@ withinImage (Region left top width height)
244544-- * mouse inputs inside the region have their coordinates translated such
245545-- that (0,0) is the top-left corner of the region
246546pane
247− :: (Reflex t, Monad m)
248− => DynRegion t
547+ :: (Reflex t, Monad m, HasInput t m, HasImageWriter t m, HasDisplayRegion t m, HasFocusReader t m)
548+ => Dynamic t Region
249549 -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
250− -> VtyWidget t m a
251− -> VtyWidget t m a
252−pane dr foc child = VtyWidget $ do
253− ctx <- lift ask
254− let reg = currentRegion dr
255− let ctx' = VtyWidgetCtx
256− { _vtyWidgetCtx_input = leftmost -- TODO: think about this leftmost more.
257− [ fmapMaybe id $
258− attachWith (\(r,f) e -> filterInput r f e)
259− (liftA2 (,) reg (current foc))
260− (_vtyWidgetCtx_input ctx)
261− ]
262− , _vtyWidgetCtx_focus = liftA2 (&&) (_vtyWidgetCtx_focus ctx) foc
263− , _vtyWidgetCtx_width = _dynRegion_width dr
264− , _vtyWidgetCtx_height = _dynRegion_height dr
265− }
266− (result, images) <- lift . lift $ runVtyWidget ctx' child
267− let images' = liftA2 (\r is -> map (withinImage r) is) reg images
268− tellImages images'
269− return result
270− where
271− filterInput :: Region -> Bool -> VtyEvent -> Maybe VtyEvent
272− filterInput (Region l t w h) focused e = case e of
273− V.EvKey _ _ | not focused -> Nothing
274− V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
275− V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
276− _ -> Just e
277− where
278− mouse con x y
279− | or [ x < l
280− , y < t
281− , x >= l + w
282− , y >= t + h ] = Nothing
283− | otherwise =
284− Just (con (x - l) (y - t))
285−
286−
287−
288−-- | Information about a drag operation
289−data Drag = Drag
290− { _drag_from :: (Int, Int) -- ^ Where the drag began
291− , _drag_to :: (Int, Int) -- ^ Where the mouse currently is
292− , _drag_button :: V.Button -- ^ Which mouse button is dragging
293− , _drag_modifiers :: [V.Modifier] -- ^ What modifiers are held
294− , _drag_end :: Bool -- ^ Whether the drag ended (the mouse button was released)
295− }
296− deriving (Eq, Ord, Show)
297−
298−-- | Converts raw vty mouse drag events into an event stream of 'Drag's
299−drag
300− :: (Reflex t, MonadFix m, MonadHold t m)
301− => V.Button
302− -> VtyWidget t m (Event t Drag)
303−drag btn = do
304− inp <- input
305− let f :: Maybe Drag -> V.Event -> Maybe Drag
306− f Nothing = \case
307− V.EvMouseDown x y btn' mods
308− | btn == btn' -> Just $ Drag (x,y) (x,y) btn' mods False
309− | otherwise -> Nothing
310− _ -> Nothing
311− f (Just (Drag from _ _ mods end)) = \case
312− V.EvMouseDown x y btn' mods'
313− | end -> Just $ Drag (x,y) (x,y) btn' mods' False
314− | btn == btn' -> Just $ Drag from (x,y) btn mods' False
315− | otherwise -> Nothing -- Ignore other buttons.
316− V.EvMouseUp x y (Just btn')
317− | end -> Nothing
318− | btn == btn' -> Just $ Drag from (x,y) btn mods True
319− | otherwise -> Nothing
320− V.EvMouseUp x y Nothing -- Terminal doesn't specify mouse up button,
321− -- assume it's the right one.
322− | end -> Nothing
323− | otherwise -> Just $ Drag from (x,y) btn mods True
324− _ -> Nothing
325− rec let newDrag = attachWithMaybe f (current dragD) inp
326− dragD <- holdDyn Nothing $ Just <$> newDrag
327− return (fmapMaybe id $ updated dragD)
328−
329−-- | Mouse down events for a particular mouse button
330−mouseDown
331− :: (Reflex t, Monad m)
332− => V.Button
333− -> VtyWidget t m (Event t MouseDown)
334−mouseDown btn = do
335− i <- input
336− return $ fforMaybe i $ \case
337− V.EvMouseDown x y btn' mods -> if btn == btn'
338− then Just $ MouseDown btn' (x, y) mods
339− else Nothing
340− _ -> Nothing
341−
342−-- | Mouse up events for a particular mouse button
343−mouseUp
344− :: (Reflex t, Monad m)
345− => VtyWidget t m (Event t MouseUp)
346−mouseUp = do
347− i <- input
348− return $ fforMaybe i $ \case
349− V.EvMouseUp x y btn' -> Just $ MouseUp btn' (x, y)
350− _ -> Nothing
351−
352−-- | Information about a mouse down event
353−data MouseDown = MouseDown
354− { _mouseDown_button :: V.Button
355− , _mouseDown_coordinates :: (Int, Int)
356− , _mouseDown_modifiers :: [V.Modifier]
357− }
358− deriving (Eq, Ord, Show)
359−
360−-- | Information about a mouse up event
361−data MouseUp = MouseUp
362− { _mouseUp_button :: Maybe V.Button
363− , _mouseUp_coordinates :: (Int, Int)
364− }
365− deriving (Eq, Ord, Show)
366−
367−-- | A plain split of the available space into vertically stacked panes.
368−-- No visual separator is built in here.
369−splitV :: (Reflex t, Monad m)
370− => Dynamic t (Int -> Int)
371− -- ^ Function used to determine size of first pane based on available size
372− -> Dynamic t (Bool, Bool)
373− -- ^ How to focus the two sub-panes, given that we are focused.
374− -> VtyWidget t m a
375− -- ^ Widget for first pane
376− -> VtyWidget t m b
377− -- ^ Widget for second pane
378− -> VtyWidget t m (a,b)
379−splitV sizeFunD focD wA wB = do
380− dw <- displayWidth
381− dh <- displayHeight
382− let regA = DynRegion
383− { _dynRegion_left = pure 0
384− , _dynRegion_top = pure 0
385− , _dynRegion_width = dw
386− , _dynRegion_height = sizeFunD <*> dh
387− }
388− regB = DynRegion
389− { _dynRegion_left = pure 0
390− , _dynRegion_top = _dynRegion_height regA
391− , _dynRegion_width = dw
392− , _dynRegion_height = liftA2 (-) dh (_dynRegion_height regA)
393− }
394− ra <- pane regA (fst <$> focD) wA
395− rb <- pane regB (snd <$> focD) wB
396− return (ra,rb)
397−
398−-- | A split of the available space into two parts with a draggable separator.
399−-- Starts with half the space allocated to each, and the first pane has focus.
400−-- Clicking in a pane switches focus.
401−splitVDrag :: (Reflex t, MonadFix m, MonadHold t m)
402− => VtyWidget t m ()
403− -> VtyWidget t m a
404− -> VtyWidget t m b
405− -> VtyWidget t m (a,b)
406−splitVDrag wS wA wB = do
407− dh <- displayHeight
408− dw <- displayWidth
409− h0 <- sample $ current dh -- TODO
410− dragE <- drag V.BLeft
411− let splitter0 = h0 `div` 2
412− rec splitterCheckpoint <- holdDyn splitter0 $ leftmost [fst <$> ffilter snd dragSplitter, resizeSplitter]
413− splitterPos <- holdDyn splitter0 $ leftmost [fst <$> dragSplitter, resizeSplitter]
414− splitterFrac <- holdDyn ((1::Double) / 2) $ ffor (attach (current dh) (fst <$> dragSplitter)) $ \(h, x) ->
415− fromIntegral x / fromIntegral h
416− let dragSplitter = fforMaybe (attach (current splitterCheckpoint) dragE) $
417− \(splitterY, Drag (_, fromY) (_, toY) _ _ end) ->
418− if splitterY == fromY then Just (toY, end) else Nothing
419− regA = DynRegion 0 0 dw splitterPos
420− regS = DynRegion 0 splitterPos dw 1
421− regB = DynRegion 0 (splitterPos + 1) dw (dh - splitterPos - 1)
422− resizeSplitter = ffor (attach (current splitterFrac) (updated dh)) $
423− \(frac, h) -> round (frac * fromIntegral h)
424− focA <- holdDyn True $ leftmost
425− [ True <$ mA
426− , False <$ mB
427− ]
428− (mA, rA) <- pane regA focA $ withMouseDown wA
429− pane regS (pure False) wS
430− (mB, rB) <- pane regB (not <$> focA) $ withMouseDown wB
431− return (rA, rB)
432− where
433− withMouseDown x = do
434− m <- mouseDown V.BLeft
435− x' <- x
436− return (m, x')
437−
438−-- | Fill the background with a particular character.
439−fill :: (Reflex t, Monad m) => Char -> VtyWidget t m ()
440−fill c = do
441− dw <- displayWidth
442− dh <- displayHeight
443− let fillImg = current $ liftA2 (\w h -> [V.charFill V.defAttr c w h]) dw dh
444− tellImages fillImg
445−
446−-- | Fill the background with the bottom
447−hRule :: (Reflex t, Monad m) => BoxStyle -> VtyWidget t m ()
448−hRule boxStyle = fill (_boxStyle_s boxStyle)
449−
450−-- | Defines a set of symbols to use to draw the outlines of boxes
451−-- C.f. https://en.wikipedia.org/wiki/Box-drawing_character
452−data BoxStyle = BoxStyle
453− { _boxStyle_nw :: Char
454− , _boxStyle_n :: Char
455− , _boxStyle_ne :: Char
456− , _boxStyle_e :: Char
457− , _boxStyle_se :: Char
458− , _boxStyle_s :: Char
459− , _boxStyle_sw :: Char
460− , _boxStyle_w :: Char
461− }
462−
463−instance Default BoxStyle where
464− def = singleBoxStyle
465−
466−-- | A box style that uses hyphens and pipe characters. Doesn't handle
467−-- corners very well.
468−hyphenBoxStyle :: BoxStyle
469−hyphenBoxStyle = BoxStyle '-' '-' '-' '|' '-' '-' '-' '|'
470−
471−-- | A single line box style
472−singleBoxStyle :: BoxStyle
473−singleBoxStyle = BoxStyle '┌' '─' '┐' '│' '┘' '─' '└' '│'
474−
475−-- | A thick single line box style
476−thickBoxStyle :: BoxStyle
477−thickBoxStyle = BoxStyle '┏' '━' '┓' '┃' '┛' '━' '┗' '┃'
478−
479−-- | A double line box style
480−doubleBoxStyle :: BoxStyle
481−doubleBoxStyle = BoxStyle '╔' '═' '╗' '║' '╝' '═' '╚' '║'
482−
483−-- | A single line box style with rounded corners
484−roundedBoxStyle :: BoxStyle
485−roundedBoxStyle = BoxStyle '╭' '─' '╮' '│' '╯' '─' '╰' '│'
486−
487−-- | Draws a box in the provided style and a child widget inside of that box
488−box :: (Monad m, Reflex t)
489− => Behavior t BoxStyle
490− -> VtyWidget t m a
491− -> VtyWidget t m a
492−box boxStyle child = do
493− dh <- displayHeight
494− dw <- displayWidth
495− let boxReg = DynRegion (pure 0) (pure 0) dw dh
496− innerReg = DynRegion (pure 1) (pure 1) (subtract 2 <$> dw) (subtract 2 <$> dh)
497− tellImages (boxImages <$> boxStyle <*> currentRegion boxReg)
498− tellImages (fmap (\r -> [regionBlankImage r]) (currentRegion innerReg))
499− pane innerReg (pure True) child
500− where
501− boxImages :: BoxStyle -> Region -> [Image]
502− boxImages style (Region left top width height) =
503− let right = left + width - 1
504− bottom = top + height - 1
505− sides =
506− [ withinImage (Region (left + 1) top (width - 2) 1) $
507− V.charFill V.defAttr (_boxStyle_n style) (width - 2) 1
508− , withinImage (Region right (top + 1) 1 (height - 2)) $
509− V.charFill V.defAttr (_boxStyle_e style) 1 (height - 2)
510− , withinImage (Region (left + 1) bottom (width - 2) 1) $
511− V.charFill V.defAttr (_boxStyle_s style) (width - 2) 1
512− , withinImage (Region left (top + 1) 1 (height - 2)) $
513− V.charFill V.defAttr (_boxStyle_w style) 1 (height - 2)
514− ]
515− corners =
516− [ withinImage (Region left top 1 1) $
517− V.char V.defAttr (_boxStyle_nw style)
518− , withinImage (Region right top 1 1) $
519− V.char V.defAttr (_boxStyle_ne style)
520− , withinImage (Region right bottom 1 1) $
521− V.char V.defAttr (_boxStyle_se style)
522− , withinImage (Region left bottom 1 1) $
523− V.char V.defAttr (_boxStyle_sw style)
524− ]
525− in sides ++ if width > 1 && height > 1 then corners else []
526−
527−-- | A box whose style is static
528−boxStatic
529− :: (Reflex t, Monad m)
530− => BoxStyle
531− -> VtyWidget t m a
532− -> VtyWidget t m a
533−boxStatic = box . pure
534−
535−-- | Configuration options for displaying "rich" text
536−data RichTextConfig t = RichTextConfig
537− { _richTextConfig_attributes :: Behavior t V.Attr
538− }
539−
540−instance Reflex t => Default (RichTextConfig t) where
541− def = RichTextConfig $ pure V.defAttr
542−
543−-- | A widget that displays text with custom time-varying attributes
544−richText
545− :: (Reflex t, Monad m)
546− => RichTextConfig t
547− -> Behavior t Text
548− -> VtyWidget t m ()
549−richText cfg t = do
550− dw <- displayWidth
551− let img = (\w a s -> [wrapText w a s])
552− <$> current dw
553− <*> _richTextConfig_attributes cfg
554− <*> t
555− tellImages img
556− where
557− wrapText maxWidth attrs = V.vertCat
558− . concatMap (fmap (V.string attrs . T.unpack) . TZ.wrapWithOffset maxWidth 0)
559− . T.split (=='\n')
560−
561−-- | Renders text, wrapped to the container width
562−text
563− :: (Reflex t, Monad m)
564− => Behavior t Text
565− -> VtyWidget t m ()
566−text = richText def
567−
568−-- | Renders any behavior whose value can be converted to
569−-- 'String' as text
570−display
571− :: (Reflex t, Monad m, Show a)
572− => Behavior t a
573− -> VtyWidget t m ()
574−display a = text $ T.pack . show <$> a
575−
576−data Direction = Direction_Column
577− | Direction_Row
578− deriving (Show, Read, Eq, Ord)
579−
580−newtype StackWidget t m a = StackWidget { unStackWidget :: Direction -> VtyWidget t m (Dynamic t Int, a) }
581− deriving (Functor)
582−
583−instance (Reflex t, MonadFix m) => Applicative (StackWidget t m) where
584− pure = return
585− (<*>) = ap
586−
587−instance (MonadFix m, Reflex t) => Monad (StackWidget t m) where
588− w >>= g = StackWidget $ \dir -> do
589− (sz, r) <- runStackWidget dir 0 w
590− (sz', r') <- runStackWidget dir sz (g r)
591− return (sz + sz', r')
592− return x = StackWidget $ \_ -> return (0, x)
593−
594−runStackWidget
595− :: (Reflex t, MonadFix m)
596− => Direction
597− -> Dynamic t Int
598− -> StackWidget t m a
599− -> VtyWidget t m (Dynamic t Int, a)
600−runStackWidget dir offset x = do
601− mkRegion <- case dir of
602− Direction_Column -> (\w sz -> DynRegion 0 offset w sz) <$> displayWidth
603− Direction_Row -> (\h sz -> DynRegion offset 0 sz h) <$> displayHeight
604− rec (h, a) <- pane (mkRegion h) (pure True) $ unStackWidget x dir
605− return (h, a)
606−
607−stack
608− :: (Reflex t, MonadFix m)
609− => Direction
610− -> StackWidget t m a
611− -> VtyWidget t m a
612−stack dir w = fmap snd $ runStackWidget dir 0 w
613−
614−col
615− :: (Reflex t, MonadFix m)
616− => StackWidget t m a
617− -> VtyWidget t m a
618−col = stack Direction_Column
619−
620−row
621− :: (Reflex t, MonadFix m)
622− => StackWidget t m a
623− -> VtyWidget t m a
624−row = stack Direction_Row
625−
626−sized
627− :: (Reflex t, MonadFix m)
628− => Dynamic t Int
629− -> VtyWidget t m a
630− -> StackWidget t m a
631−sized sz w = StackWidget $ \_ -> (sz,) <$> w
550+ -> m a
551+ -> m a
552+pane dr foc child = localRegion (const dr) $
553+ mapImages (imagesInRegion $ current dr) $
554+ localFocus (const foc) $
555+ inputInFocusedRegion >>= \e -> localInput (const e) child
556+
557+-- * Misc
558+
559+-- | A widget that draws nothing
560+blank :: Monad m => m ()
561+blank = return ()