@@ -2,156 +2,41 @@
22Module: Reflex.Vty.Widget
33Description: Basic set of widgets and building blocks for reflex-vty applications
44-}
5−{-# LANGUAGE DefaultSignatures #-}
6−{-# LANGUAGE DeriveFunctor #-}
7−{-# LANGUAGE FlexibleContexts #-}
8−{-# LANGUAGE FlexibleInstances #-}
9−{-# LANGUAGE FunctionalDependencies #-}
10−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
11−{-# LANGUAGE LambdaCase #-}
12−{-# LANGUAGE RankNTypes #-}
13−{-# LANGUAGE RecursiveDo #-}
14−{-# LANGUAGE ScopedTypeVariables #-}
15−{-# LANGUAGE StandaloneDeriving #-}
16−{-# LANGUAGE TupleSections #-}
17−{-# LANGUAGE TypeFamilies #-}
18−{-# LANGUAGE UndecidableInstances #-}
19−
20−module Reflex.Vty.Widget
21− ( VtyWidgetCtx(..)
22− , VtyWidget(..)
23− , VtyWidgetOut(..)
24− , ImageWriter(..)
25− , runVtyWidget
26− , mainWidget
27− , mainWidgetWithHandle
28− , HasDisplaySize(..)
29− , HasFocus(..)
30− , HasVtyInput(..)
31− , DynRegion(..)
32− , currentRegion
33− , Region(..)
34− , regionSize
35− , regionBlankImage
36− , Drag(..)
37− , drag
38− , MouseDown(..)
39− , MouseUp(..)
40− , mouseDown
41− , mouseUp
42− , pane
43− , splitV
44− , splitVDrag
45− , box
46− , boxStatic
47− , RichTextConfig(..)
48− , richText
49− , text
50− , display
51− , BoxStyle(..)
52− , hyphenBoxStyle
53− , singleBoxStyle
54− , roundedBoxStyle
55− , thickBoxStyle
56− , doubleBoxStyle
57− , fill
58− , hRule
59− , KeyCombo
60− , key
61− , keys
62− , keyCombo
63− , keyCombos
64− , blank
65− ) where
5+{-# Language UndecidableInstances #-}
6+
7+module Reflex.Vty.Widget where
668
679import Control.Applicative (liftA2)
6810import Control.Monad.Fix (MonadFix)
69−import Control.Monad.Reader
70−import Control.Monad.Trans (lift)
71−import Data.Default (Default(..))
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)
7217import Data.Set (Set)
7318import qualified Data.Set as Set
74−import Data.Text (Text)
75−import qualified Data.Text as T
76−import qualified Data.Text.Zipper as TZ
7719import Graphics.Vty (Image)
7820import qualified Graphics.Vty as V
7921import Reflex
8022import Reflex.Class ()
8123import Reflex.Host.Class (MonadReflexCreateTrigger)
82−
8324import Reflex.Vty.Host
8425
85−import Control.Monad.NodeId
86−
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− }
26+-- * Running a vty application
10727
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− } deriving
121− ( Functor
122− , Applicative
123− , Monad
124− , MonadSample t
125− , MonadHold t
126− , MonadFix
127− , NotReady t
128− , ImageWriter t
129− , PostBuild t
130− , TriggerEvent t
131− , MonadReflexCreateTrigger t
132− , MonadIO
133− )
134−
135−deriving instance PerformEvent t m => PerformEvent t (VtyWidget t m)
136−instance MonadTrans (VtyWidget t) where
137− lift f = VtyWidget $ lift $ lift f
138−
139−instance MonadNodeId m => MonadNodeId (VtyWidget t m) where
140− getNextNodeId = VtyWidget $ do
141− lift $ lift $ getNextNodeId
142−
143−-- | Runs a 'VtyWidget' with a given context
144−runVtyWidget
145− :: (Reflex t, MonadNodeId m)
146− => VtyWidgetCtx t
147− -> VtyWidget t m a
148− -> m (a, Behavior t [Image])
149−runVtyWidget ctx w = runReaderT (runBehaviorWriterT (unVtyWidget w)) ctx
150−
151−-- | 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
15229mainWidgetWithHandle
15330 :: V.Vty
154− -> (forall t m. (MonadVtyApp t m, MonadNodeId 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 ()))
15540 -> IO ()
15641mainWidgetWithHandle vty child =
15742 runVtyAppWithHandle vty $ \dr0 inp -> do
@@ -161,71 +46,178 @@ mainWidgetWithHandle vty child =
16146 let inp' = fforMaybe inp $ \case
16247 V.EvResize {} -> Nothing
16348 x -> Just x
164− let ctx = VtyWidgetCtx
165− { _vtyWidgetCtx_width = fmap fst size
166− , _vtyWidgetCtx_height = fmap snd size
167− , _vtyWidgetCtx_input = inp'
168− , _vtyWidgetCtx_focus = constDyn True
169− }
170− (shutdown, images) <- runNodeIdT $ runVtyWidget ctx $ do
171− tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
172− 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
17357 return $ VtyResult
17458 { _vtyResult_picture = fmap (V.picForLayers . reverse) images
17559 , _vtyResult_shutdown = shutdown
17660 }
17761
62+-- | The output of a vty widget
63+data VtyWidgetOut t = VtyWidgetOut
64+ { _vtyWidgetOut_shutdown :: Event t ()
65+ }
66+
17867-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
17968mainWidget
180− :: (forall t m. (MonadVtyApp t m, MonadNodeId 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 ()))
18178 -> IO ()
18279mainWidget child = do
18380 vty <- getDefaultVty
18481 mainWidgetWithHandle vty child
18582
186−-- | A class for things that know their own display size dimensions
187−class (Reflex t, Monad m) => HasDisplaySize t m | m -> t where
188− -- | Retrieve the display width (columns)
189− displayWidth :: m (Dynamic t Int)
190− default displayWidth :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
191− displayWidth = lift displayWidth
192− -- | Retrieve the display height (rows)
193− displayHeight :: m (Dynamic t Int)
194− default displayHeight :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
195− displayHeight = lift displayHeight
196−
197−instance (Reflex t, Monad m) => HasDisplaySize t (VtyWidget t m) where
198− displayWidth = VtyWidget . lift $ asks _vtyWidgetCtx_width
199− displayHeight = VtyWidget . lift $ asks _vtyWidgetCtx_height
200−
201−instance HasDisplaySize t m => HasDisplaySize t (ReaderT x m)
202−instance HasDisplaySize t m => HasDisplaySize t (BehaviorWriterT t x m)
203−instance HasDisplaySize t m => HasDisplaySize t (DynamicWriterT t x m)
204−instance HasDisplaySize t m => HasDisplaySize t (EventWriterT t x m)
205−
206−instance HasDisplaySize t m => HasDisplaySize t (NodeIdT m)
83+-- * Input Events
20784
20885-- | A class for things that can receive vty events as input
209−class HasVtyInput t m | m -> t where
86+class HasInput t m | m -> t where
21087 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+ )
211113
212−instance (Reflex t, Monad m) => HasVtyInput t (VtyWidget t m) where
213− input = VtyWidget . lift $ asks _vtyWidgetCtx_input
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
214149
215−-- | A class for things that can dynamically gain and lose focus
216−class HasFocus t m | m -> t where
217− focus :: m (Dynamic t Bool)
150+-- | Type synonym for a key and modifier combination
151+type KeyCombo = (V.Key, [V.Modifier])
218152
219−instance (Reflex t, Monad m) => HasFocus t (VtyWidget t m) where
220− focus = VtyWidget . lift $ asks _vtyWidgetCtx_focus
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 . (,[])
221156
222−-- | A class for widgets that can produce images to draw to the display
223−class (Reflex t, Monad m) => ImageWriter t m | m -> t where
224− -- | Send images upstream for rendering
225− tellImages :: Behavior t [Image] -> m ()
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 (,[])
226160
227−instance (Monad m, Reflex t) => ImageWriter t (BehaviorWriterT t [Image] m) where
228− tellImages = tellBehavior
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
180+
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
219+
220+-- * Getting and setting the display region
229221
230222-- | A chunk of the display area
231223data Region = Region
@@ -236,26 +228,293 @@ data Region = Region
236228 }
237229 deriving (Show, Read, Eq, Ord)
238230
239−-- | A dynamic chunk of the display area
240−data DynRegion t = DynRegion
241− { _dynRegion_left :: Dynamic t Int
242− , _dynRegion_top :: Dynamic t Int
243− , _dynRegion_width :: Dynamic t Int
244− , _dynRegion_height :: Dynamic t Int
245− }
231+-- | A region that occupies no space.
232+nilRegion :: Region
233+nilRegion = Region 0 0 0 0
246234
247235-- | The width and height of a 'Region'
248236regionSize :: Region -> (Int, Int)
249237regionSize (Region _ _ w h) = (w, h)
250238
251239-- | Produces an 'Image' that fills a region with space characters
252−regionBlankImage :: Region -> Image
253−regionBlankImage r@(Region _ _ width height) =
254− 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
318+
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)
255358
256−-- | A behavior of the current display area represented by a 'DynRegion'
257−currentRegion :: Reflex t => DynRegion t -> Behavior t Region
258−currentRegion (DynRegion l t w h) = Region <$> current l <*> current t <*> current w <*> current h
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
259518
260519-- | Translates and crops an 'Image' so that it is contained by
261520-- the given 'Region'.
@@ -267,7 +526,17 @@ withinImage (Region left top width height)
267526 | width < 0 || height < 0 = withinImage (Region left top 0 0)
268527 | otherwise = V.translate left top . V.crop width height
269528
270−-- | 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
271540-- a given region and context. This widget filters and modifies the input
272541-- that the child widget receives such that:
273542-- * unfocused widgets receive no key events
@@ -275,364 +544,18 @@ withinImage (Region left top width height)
275544-- * mouse inputs inside the region have their coordinates translated such
276545-- that (0,0) is the top-left corner of the region
277546pane
278− :: (Reflex t, Monad m, MonadNodeId m)
279− => DynRegion t
547+ :: (Reflex t, Monad m, HasInput t m, HasImageWriter t m, HasDisplayRegion t m, HasFocusReader t m)
548+ => Dynamic t Region
280549 -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
281− -> VtyWidget t m a
282− -> VtyWidget t m a
283−pane dr foc child = VtyWidget $ do
284− ctx <- lift ask
285− let reg = currentRegion dr
286− let ctx' = VtyWidgetCtx
287− { _vtyWidgetCtx_input = leftmost -- TODO: think about this leftmost more.
288− [ fmapMaybe id $
289− attachWith (\(r,f) e -> filterInput r f e)
290− (liftA2 (,) reg (current foc))
291− (_vtyWidgetCtx_input ctx)
292− ]
293− , _vtyWidgetCtx_focus = liftA2 (&&) (_vtyWidgetCtx_focus ctx) foc
294− , _vtyWidgetCtx_width = _dynRegion_width dr
295− , _vtyWidgetCtx_height = _dynRegion_height dr
296− }
297− (result, images) <- lift . lift $ runVtyWidget ctx' child
298− let images' = liftA2 (\r is -> map (withinImage r) is) reg images
299− tellImages images'
300− return result
301− where
302− filterInput :: Region -> Bool -> VtyEvent -> Maybe VtyEvent
303− filterInput (Region l t w h) focused e = case e of
304− V.EvKey _ _ | not focused -> Nothing
305− V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
306− V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
307− _ -> Just e
308− where
309− mouse con x y
310− | or [ x < l
311− , y < t
312− , x >= l + w
313− , y >= t + h ] = Nothing
314− | otherwise =
315− Just (con (x - l) (y - t))
316−
317−-- | Information about a drag operation
318−data Drag = Drag
319− { _drag_from :: (Int, Int) -- ^ Where the drag began
320− , _drag_to :: (Int, Int) -- ^ Where the mouse currently is
321− , _drag_button :: V.Button -- ^ Which mouse button is dragging
322− , _drag_modifiers :: [V.Modifier] -- ^ What modifiers are held
323− , _drag_end :: Bool -- ^ Whether the drag ended (the mouse button was released)
324− }
325− deriving (Eq, Ord, Show)
326−
327−-- | Converts raw vty mouse drag events into an event stream of 'Drag's
328−drag
329− :: (Reflex t, MonadFix m, MonadHold t m)
330− => V.Button
331− -> VtyWidget t m (Event t Drag)
332−drag btn = do
333− inp <- input
334− let f :: Maybe Drag -> V.Event -> Maybe Drag
335− f Nothing = \case
336− V.EvMouseDown x y btn' mods
337− | btn == btn' -> Just $ Drag (x,y) (x,y) btn' mods False
338− | otherwise -> Nothing
339− _ -> Nothing
340− f (Just (Drag from _ _ mods end)) = \case
341− V.EvMouseDown x y btn' mods'
342− | end -> Just $ Drag (x,y) (x,y) btn' mods' False
343− | btn == btn' -> Just $ Drag from (x,y) btn mods' False
344− | otherwise -> Nothing -- Ignore other buttons.
345− V.EvMouseUp x y (Just btn')
346− | end -> Nothing
347− | btn == btn' -> Just $ Drag from (x,y) btn mods True
348− | otherwise -> Nothing
349− V.EvMouseUp x y Nothing -- Terminal doesn't specify mouse up button,
350− -- assume it's the right one.
351− | end -> Nothing
352− | otherwise -> Just $ Drag from (x,y) btn mods True
353− _ -> Nothing
354− rec let newDrag = attachWithMaybe f (current dragD) inp
355− dragD <- holdDyn Nothing $ Just <$> newDrag
356− return (fmapMaybe id $ updated dragD)
357−
358−-- | Mouse down events for a particular mouse button
359−mouseDown
360− :: (Reflex t, Monad m)
361− => V.Button
362− -> VtyWidget t m (Event t MouseDown)
363−mouseDown btn = do
364− i <- input
365− return $ fforMaybe i $ \case
366− V.EvMouseDown x y btn' mods -> if btn == btn'
367− then Just $ MouseDown btn' (x, y) mods
368− else Nothing
369− _ -> Nothing
370−
371−-- | Mouse up events for a particular mouse button
372−mouseUp
373− :: (Reflex t, Monad m)
374− => VtyWidget t m (Event t MouseUp)
375−mouseUp = do
376− i <- input
377− return $ fforMaybe i $ \case
378− V.EvMouseUp x y btn' -> Just $ MouseUp btn' (x, y)
379− _ -> Nothing
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
380556
381−-- | Information about a mouse down event
382−data MouseDown = MouseDown
383− { _mouseDown_button :: V.Button
384− , _mouseDown_coordinates :: (Int, Int)
385− , _mouseDown_modifiers :: [V.Modifier]
386− }
387− deriving (Eq, Ord, Show)
388−
389−-- | Information about a mouse up event
390−data MouseUp = MouseUp
391− { _mouseUp_button :: Maybe V.Button
392− , _mouseUp_coordinates :: (Int, Int)
393− }
394− deriving (Eq, Ord, Show)
395−
396−-- | Type synonym for a key and modifier combination
397−type KeyCombo = (V.Key, [V.Modifier])
398−
399−-- | Emits an event that fires on a particular key press (without modifiers)
400−key :: (Monad m, Reflex t) => V.Key -> VtyWidget t m (Event t KeyCombo)
401−key = keyCombos . Set.singleton . (,[])
402−
403−-- | Emits an event that fires on particular key presses (without modifiers)
404−keys :: (Monad m, Reflex t) => [V.Key] -> VtyWidget t m (Event t KeyCombo)
405−keys = keyCombos . Set.fromList . fmap (,[])
406−
407−-- | Emit an event that fires whenever the provided key combination occurs
408−keyCombo
409− :: (Reflex t, Monad m)
410− => KeyCombo
411− -> VtyWidget t m (Event t KeyCombo)
412−keyCombo = keyCombos . Set.singleton
413−
414−-- | Emit an event that fires whenever any of the provided key combinations occur
415−keyCombos
416− :: (Reflex t, Monad m)
417− => Set KeyCombo
418− -> VtyWidget t m (Event t KeyCombo)
419−keyCombos ks = do
420− i <- input
421− return $ fforMaybe i $ \case
422− V.EvKey k m -> if Set.member (k, m) ks
423− then Just (k, m)
424− else Nothing
425− _ -> Nothing
426−
427−-- | A plain split of the available space into vertically stacked panes.
428−-- No visual separator is built in here.
429−splitV :: (Reflex t, Monad m, MonadNodeId m)
430− => Dynamic t (Int -> Int)
431− -- ^ Function used to determine size of first pane based on available size
432− -> Dynamic t (Bool, Bool)
433− -- ^ How to focus the two sub-panes, given that we are focused.
434− -> VtyWidget t m a
435− -- ^ Widget for first pane
436− -> VtyWidget t m b
437− -- ^ Widget for second pane
438− -> VtyWidget t m (a,b)
439−splitV sizeFunD focD wA wB = do
440− dw <- displayWidth
441− dh <- displayHeight
442− let regA = DynRegion
443− { _dynRegion_left = pure 0
444− , _dynRegion_top = pure 0
445− , _dynRegion_width = dw
446− , _dynRegion_height = sizeFunD <*> dh
447− }
448− regB = DynRegion
449− { _dynRegion_left = pure 0
450− , _dynRegion_top = _dynRegion_height regA
451− , _dynRegion_width = dw
452− , _dynRegion_height = liftA2 (-) dh (_dynRegion_height regA)
453− }
454− ra <- pane regA (fst <$> focD) wA
455− rb <- pane regB (snd <$> focD) wB
456− return (ra,rb)
457−
458−-- | A split of the available space into two parts with a draggable separator.
459−-- Starts with half the space allocated to each, and the first pane has focus.
460−-- Clicking in a pane switches focus.
461−splitVDrag :: (Reflex t, MonadFix m, MonadHold t m, MonadNodeId m)
462− => VtyWidget t m ()
463− -> VtyWidget t m a
464− -> VtyWidget t m b
465− -> VtyWidget t m (a,b)
466−splitVDrag wS wA wB = do
467− dh <- displayHeight
468− dw <- displayWidth
469− h0 <- sample $ current dh -- TODO
470− dragE <- drag V.BLeft
471− let splitter0 = h0 `div` 2
472− rec splitterCheckpoint <- holdDyn splitter0 $ leftmost [fst <$> ffilter snd dragSplitter, resizeSplitter]
473− splitterPos <- holdDyn splitter0 $ leftmost [fst <$> dragSplitter, resizeSplitter]
474− splitterFrac <- holdDyn ((1::Double) / 2) $ ffor (attach (current dh) (fst <$> dragSplitter)) $ \(h, x) ->
475− fromIntegral x / (max 1 (fromIntegral h))
476− let dragSplitter = fforMaybe (attach (current splitterCheckpoint) dragE) $
477− \(splitterY, Drag (_, fromY) (_, toY) _ _ end) ->
478− if splitterY == fromY then Just (toY, end) else Nothing
479− regA = DynRegion 0 0 dw splitterPos
480− regS = DynRegion 0 splitterPos dw 1
481− regB = DynRegion 0 (splitterPos + 1) dw (dh - splitterPos - 1)
482− resizeSplitter = ffor (attach (current splitterFrac) (updated dh)) $
483− \(frac, h) -> round (frac * fromIntegral h)
484− focA <- holdDyn True $ leftmost
485− [ True <$ mA
486− , False <$ mB
487− ]
488− (mA, rA) <- pane regA focA $ withMouseDown wA
489− pane regS (pure False) wS
490− (mB, rB) <- pane regB (not <$> focA) $ withMouseDown wB
491− return (rA, rB)
492− where
493− withMouseDown x = do
494− m <- mouseDown V.BLeft
495− x' <- x
496− return (m, x')
497−
498−-- | Fill the background with a particular character.
499−fill :: (Reflex t, Monad m) => Char -> VtyWidget t m ()
500−fill c = do
501− dw <- displayWidth
502− dh <- displayHeight
503− let fillImg = current $ liftA2 (\w h -> [V.charFill V.defAttr c w h]) dw dh
504− tellImages fillImg
505−
506−-- | Fill the background with the bottom
507−hRule :: (Reflex t, Monad m) => BoxStyle -> VtyWidget t m ()
508−hRule boxStyle = fill (_boxStyle_s boxStyle)
509−
510−-- | Defines a set of symbols to use to draw the outlines of boxes
511−-- C.f. https://en.wikipedia.org/wiki/Box-drawing_character
512−data BoxStyle = BoxStyle
513− { _boxStyle_nw :: Char
514− , _boxStyle_n :: Char
515− , _boxStyle_ne :: Char
516− , _boxStyle_e :: Char
517− , _boxStyle_se :: Char
518− , _boxStyle_s :: Char
519− , _boxStyle_sw :: Char
520− , _boxStyle_w :: Char
521− }
522−
523−instance Default BoxStyle where
524− def = singleBoxStyle
525−
526−-- | A box style that uses hyphens and pipe characters. Doesn't handle
527−-- corners very well.
528−hyphenBoxStyle :: BoxStyle
529−hyphenBoxStyle = BoxStyle '-' '-' '-' '|' '-' '-' '-' '|'
530−
531−-- | A single line box style
532−singleBoxStyle :: BoxStyle
533−singleBoxStyle = BoxStyle '┌' '─' '┐' '│' '┘' '─' '└' '│'
534−
535−-- | A thick single line box style
536−thickBoxStyle :: BoxStyle
537−thickBoxStyle = BoxStyle '┏' '━' '┓' '┃' '┛' '━' '┗' '┃'
538−
539−-- | A double line box style
540−doubleBoxStyle :: BoxStyle
541−doubleBoxStyle = BoxStyle '╔' '═' '╗' '║' '╝' '═' '╚' '║'
542−
543−-- | A single line box style with rounded corners
544−roundedBoxStyle :: BoxStyle
545−roundedBoxStyle = BoxStyle '╭' '─' '╮' '│' '╯' '─' '╰' '│'
546−
547−-- | Draws a box in the provided style and a child widget inside of that box
548−box :: (Monad m, Reflex t, MonadNodeId m)
549− => Behavior t BoxStyle
550− -> VtyWidget t m a
551− -> VtyWidget t m a
552−box boxStyle child = do
553− dh <- displayHeight
554− dw <- displayWidth
555− let boxReg = DynRegion (pure 0) (pure 0) dw dh
556− innerReg = DynRegion (pure 1) (pure 1) (subtract 2 <$> dw) (subtract 2 <$> dh)
557− tellImages (boxImages <$> boxStyle <*> currentRegion boxReg)
558− tellImages (fmap (\r -> [regionBlankImage r]) (currentRegion innerReg))
559− pane innerReg (pure True) child
560− where
561− boxImages :: BoxStyle -> Region -> [Image]
562− boxImages style (Region left top width height) =
563− let right = left + width - 1
564− bottom = top + height - 1
565− sides =
566− [ withinImage (Region (left + 1) top (width - 2) 1) $
567− V.charFill V.defAttr (_boxStyle_n style) (width - 2) 1
568− , withinImage (Region right (top + 1) 1 (height - 2)) $
569− V.charFill V.defAttr (_boxStyle_e style) 1 (height - 2)
570− , withinImage (Region (left + 1) bottom (width - 2) 1) $
571− V.charFill V.defAttr (_boxStyle_s style) (width - 2) 1
572− , withinImage (Region left (top + 1) 1 (height - 2)) $
573− V.charFill V.defAttr (_boxStyle_w style) 1 (height - 2)
574− ]
575− corners =
576− [ withinImage (Region left top 1 1) $
577− V.char V.defAttr (_boxStyle_nw style)
578− , withinImage (Region right top 1 1) $
579− V.char V.defAttr (_boxStyle_ne style)
580− , withinImage (Region right bottom 1 1) $
581− V.char V.defAttr (_boxStyle_se style)
582− , withinImage (Region left bottom 1 1) $
583− V.char V.defAttr (_boxStyle_sw style)
584− ]
585− in sides ++ if width > 1 && height > 1 then corners else []
586−
587−-- | A box whose style is static
588−boxStatic
589− :: (Reflex t, Monad m, MonadNodeId m)
590− => BoxStyle
591− -> VtyWidget t m a
592− -> VtyWidget t m a
593−boxStatic = box . pure
594−
595−-- | Configuration options for displaying "rich" text
596−data RichTextConfig t = RichTextConfig
597− { _richTextConfig_attributes :: Behavior t V.Attr
598− }
599−
600−instance Reflex t => Default (RichTextConfig t) where
601− def = RichTextConfig $ pure V.defAttr
602−
603−-- | A widget that displays text with custom time-varying attributes
604−richText
605− :: (Reflex t, Monad m)
606− => RichTextConfig t
607− -> Behavior t Text
608− -> VtyWidget t m ()
609−richText cfg t = do
610− dw <- displayWidth
611− let img = (\w a s -> [wrapText w a s])
612− <$> current dw
613− <*> _richTextConfig_attributes cfg
614− <*> t
615− tellImages img
616− where
617− wrapText maxWidth attrs = V.vertCat
618− . concatMap (fmap (V.string attrs . T.unpack) . TZ.wrapWithOffset maxWidth 0)
619− . T.split (=='\n')
620−
621−-- | Renders text, wrapped to the container width
622−text
623− :: (Reflex t, Monad m)
624− => Behavior t Text
625− -> VtyWidget t m ()
626−text = richText def
627−
628−-- | Renders any behavior whose value can be converted to
629−-- 'String' as text
630−display
631− :: (Reflex t, Monad m, Show a)
632− => Behavior t a
633− -> VtyWidget t m ()
634−display a = text $ T.pack . show <$> a
557+-- * Misc
635558
636559-- | A widget that draws nothing
637−blank :: Monad m => VtyWidget t m ()
560+blank :: Monad m => m ()
638561blank = return ()