@@ -4,145 +4,39 @@ Description: Basic set of widgets and building blocks for reflex-vty application
44-}
55{-# Language UndecidableInstances #-}
66
7−module Reflex.Vty.Widget
8− ( VtyWidgetCtx(..)
9− , VtyWidget(..)
10− , VtyWidgetOut(..)
11− , ImageWriter(..)
12− , runVtyWidget
13− , mainWidget
14− , mainWidgetWithHandle
15− , HasDisplaySize(..)
16− , HasFocus(..)
17− , HasVtyInput(..)
18− , Region(..)
19− , regionSize
20− , regionBlankImage
21− , Drag(..)
22− , drag
23− , MouseDown(..)
24− , MouseUp(..)
25− , mouseDown
26− , mouseUp
27− , ScrollDirection(..)
28− , mouseScroll
29− , pane
30− , splitV
31− , splitH
32− , splitVDrag
33− , boxTitle
34− , box
35− , boxStatic
36− , RichTextConfig(..)
37− , richText
38− , text
39− , scrollableText
40− , display
41− , BoxStyle(..)
42− , hyphenBoxStyle
43− , singleBoxStyle
44− , roundedBoxStyle
45− , thickBoxStyle
46− , doubleBoxStyle
47− , fill
48− , hRule
49− , KeyCombo
50− , key
51− , keys
52− , keyCombo
53− , keyCombos
54− , blank
55− ) where
7+module Reflex.Vty.Widget where
568
579import Control.Applicative (liftA2)
5810import Control.Monad.Fix (MonadFix)
5911import Control.Monad.IO.Class (MonadIO)
60−import Control.Monad.Reader (ReaderT, ask, asks, runReaderT)
12+import Control.Monad.Morph
13+import Control.Monad.NodeId
14+import Control.Monad.Reader (ReaderT, ask, local, runReaderT)
15+import Control.Monad.Ref
6116import Control.Monad.Trans (MonadTrans, lift)
62−import Data.Default (Default(..))
6317import Data.Set (Set)
6418import qualified Data.Set as Set
65−import Data.Text (Text)
66−import qualified Data.Text as T
67−import qualified Data.Text.Zipper as TZ
6819import Graphics.Vty (Image)
6920import qualified Graphics.Vty as V
7021import Reflex
7122import Reflex.Class ()
7223import Reflex.Host.Class (MonadReflexCreateTrigger)
73−
7424import Reflex.Vty.Host
7525
76−import Control.Monad.NodeId
77−
78−-- | The context within which a 'VtyWidget' runs
79−data VtyWidgetCtx t = VtyWidgetCtx
80− { _vtyWidgetCtx_width :: Dynamic t Int
81− -- ^ The width of the region allocated to the widget.
82− , _vtyWidgetCtx_height :: Dynamic t Int
83− -- ^ The height of the region allocated to the widget.
84− , _vtyWidgetCtx_focus :: Dynamic t Bool
85− -- ^ Whether the widget should behave as if it has focus for keyboard input.
86− , _vtyWidgetCtx_input :: Event t VtyEvent
87− -- ^ User input events that the widget's parent chooses to share. These will generally
88− -- be filtered for relevance:
89− -- * Keyboard inputs are restricted to focused widgets
90− -- * Mouse inputs are restricted to the region in which the widget resides and are
91− -- translated into its internal coordinates.
92− }
93−
94−-- | The output of a 'VtyWidget'
95−data VtyWidgetOut t = VtyWidgetOut
96− { _vtyWidgetOut_shutdown :: Event t ()
97− }
98−
99−instance (Adjustable t m, MonadHold t m, Reflex t) => Adjustable t (VtyWidget t m) where
100− runWithReplace a0 a' = VtyWidget $ runWithReplace (unVtyWidget a0) $ fmap unVtyWidget a'
101− traverseIntMapWithKeyWithAdjust f dm0 dm' = VtyWidget $
102− traverseIntMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
103− traverseDMapWithKeyWithAdjust f dm0 dm' = VtyWidget $ do
104− traverseDMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
105− traverseDMapWithKeyWithAdjustWithMove f dm0 dm' = VtyWidget $ do
106− traverseDMapWithKeyWithAdjustWithMove (\k v -> unVtyWidget (f k v)) dm0 dm'
107−
108−-- | A widget that can read its context and produce image output
109−newtype VtyWidget t m a = VtyWidget
110− { unVtyWidget :: BehaviorWriterT t [Image] (ReaderT (VtyWidgetCtx t) m) a
111− } deriving
112− ( Functor
113− , Applicative
114− , Monad
115− , MonadSample t
116− , MonadHold t
117− , MonadFix
118− , NotReady t
119− , ImageWriter t
120− , PostBuild t
121− , TriggerEvent t
122− , MonadReflexCreateTrigger t
123− , MonadIO
124− )
125−
126−deriving instance PerformEvent t m => PerformEvent t (VtyWidget t m)
127−instance MonadTrans (VtyWidget t) where
128− lift f = VtyWidget $ lift $ lift f
129−
130−instance MonadNodeId m => MonadNodeId (VtyWidget t m) where
131− getNextNodeId = VtyWidget $ do
132− lift $ lift getNextNodeId
133−
134−-- | Runs a 'VtyWidget' with a given context
135−runVtyWidget
136− :: (Reflex t, MonadNodeId m)
137− => VtyWidgetCtx t
138− -> VtyWidget t m a
139− -> m (a, Behavior t [Image])
140−runVtyWidget ctx w = runReaderT (runBehaviorWriterT (unVtyWidget w)) ctx
26+-- * Running a vty application
14127
142−-- | 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
14329mainWidgetWithHandle
14430 :: V.Vty
145− -> (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 ()))
14640 -> IO ()
14741mainWidgetWithHandle vty child =
14842 runVtyAppWithHandle vty $ \dr0 inp -> do
@@ -152,73 +46,178 @@ mainWidgetWithHandle vty child =
15246 let inp' = fforMaybe inp $ \case
15347 V.EvResize {} -> Nothing
15448 x -> Just x
155− let ctx = VtyWidgetCtx
156− { _vtyWidgetCtx_width = fmap fst size
157− , _vtyWidgetCtx_height = fmap snd size
158− , _vtyWidgetCtx_input = inp'
159− , _vtyWidgetCtx_focus = constDyn True
160− }
161− (shutdown, images) <- runNodeIdT $ runVtyWidget ctx $ do
162− tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
163− 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
16457 return $ VtyResult
16558 { _vtyResult_picture = fmap (V.picForLayers . reverse) images
16659 , _vtyResult_shutdown = shutdown
16760 }
16861
62+-- | The output of a vty widget
63+data VtyWidgetOut t = VtyWidgetOut
64+ { _vtyWidgetOut_shutdown :: Event t ()
65+ }
66+
16967-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
17068mainWidget
171− :: (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 ()))
17278 -> IO ()
17379mainWidget child = do
17480 vty <- getDefaultVty
17581 mainWidgetWithHandle vty child
17682
177−-- | A class for things that know their own display size dimensions
178−class (Reflex t, Monad m) => HasDisplaySize t m | m -> t where
179− -- | Retrieve the display width (columns)
180− displayWidth :: m (Dynamic t Int)
181− default displayWidth :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
182− displayWidth = lift displayWidth
183− -- | Retrieve the display height (rows)
184− displayHeight :: m (Dynamic t Int)
185− default displayHeight :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
186− displayHeight = lift displayHeight
187−
188−instance (Reflex t, Monad m) => HasDisplaySize t (VtyWidget t m) where
189− displayWidth = VtyWidget . lift $ asks _vtyWidgetCtx_width
190− displayHeight = VtyWidget . lift $ asks _vtyWidgetCtx_height
191−
192−instance HasDisplaySize t m => HasDisplaySize t (ReaderT x m)
193−instance HasDisplaySize t m => HasDisplaySize t (BehaviorWriterT t x m)
194−instance HasDisplaySize t m => HasDisplaySize t (DynamicWriterT t x m)
195−instance HasDisplaySize t m => HasDisplaySize t (EventWriterT t x m)
196−
197−instance HasDisplaySize t m => HasDisplaySize t (NodeIdT m)
83+-- * Input Events
19884
19985-- | A class for things that can receive vty events as input
200−class HasVtyInput t m | m -> t where
86+class HasInput t m | m -> t where
20187 input :: m (Event t VtyEvent)
202− default input :: (f m' ~ m, Monad m', MonadTrans f, HasVtyInput t m') => m (Event t VtyEvent)
88+ default input :: (f m' ~ m, Monad m', MonadTrans f, HasInput t m') => m (Event t VtyEvent)
20389 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+ )
204113
205−instance (Reflex t, Monad m) => HasVtyInput t (VtyWidget t m) where
206− 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
207149
208−-- | A class for things that can dynamically gain and lose focus
209−class HasFocus t m | m -> t where
210− focus :: m (Dynamic t Bool)
150+-- | Type synonym for a key and modifier combination
151+type KeyCombo = (V.Key, [V.Modifier])
211152
212−instance (Reflex t, Monad m) => HasFocus t (VtyWidget t m) where
213− 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 . (,[])
214156
215−-- | A class for widgets that can produce images to draw to the display
216−class (Reflex t, Monad m) => ImageWriter t m | m -> t where
217− -- | Send images upstream for rendering
218− 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 (,[])
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
219167
220−instance (Monad m, Reflex t) => ImageWriter t (BehaviorWriterT t [Image] m) where
221− tellImages = tellBehavior
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
222221
223222-- | A chunk of the display area
224223data Region = Region
@@ -229,14 +228,293 @@ data Region = Region
229228 }
230229 deriving (Show, Read, Eq, Ord)
231230
231+-- | A region that occupies no space.
232+nilRegion :: Region
233+nilRegion = Region 0 0 0 0
234+
232235-- | The width and height of a 'Region'
233236regionSize :: Region -> (Int, Int)
234237regionSize (Region _ _ w h) = (w, h)
235238
236239-- | Produces an 'Image' that fills a region with space characters
237−regionBlankImage :: Region -> Image
238−regionBlankImage r@(Region _ _ width height) =
239− 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)
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
240518
241519-- | Translates and crops an 'Image' so that it is contained by
242520-- the given 'Region'.
@@ -248,449 +526,36 @@ withinImage (Region left top width height)
248526 | width < 0 || height < 0 = withinImage (Region left top 0 0)
249527 | otherwise = V.translate left top . V.crop width height
250528
251−-- | 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
252540-- a given region and context. This widget filters and modifies the input
253541-- that the child widget receives such that:
254542-- * unfocused widgets receive no key events
255543-- * mouse inputs outside the region are ignored
256544-- * mouse inputs inside the region have their coordinates translated such
257545-- that (0,0) is the top-left corner of the region
258−-- TODO make this polymorphic
259546pane
260− :: (Reflex t, Monad m, MonadNodeId m)
547+ :: (Reflex t, Monad m, HasInput t m, HasImageWriter t m, HasDisplayRegion t m, HasFocusReader t m)
261548 => Dynamic t Region
262549 -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
263− -> VtyWidget t m a
264− -> VtyWidget t m a
265−pane dr foc child = VtyWidget $ do
266− ctx <- lift ask
267− let reg = current dr
268− let ctx' = VtyWidgetCtx
269− { _vtyWidgetCtx_input = leftmost -- TODO: think about this leftmost more.
270− [ fmapMaybe id $
271− attachWith (\(r,f) e -> filterInput r f e)
272− (liftA2 (,) reg (current foc))
273− (_vtyWidgetCtx_input ctx)
274− ]
275− , _vtyWidgetCtx_focus = liftA2 (&&) (_vtyWidgetCtx_focus ctx) foc
276− , _vtyWidgetCtx_width = _region_width <$> dr
277− , _vtyWidgetCtx_height = _region_height <$> dr
278− }
279− (result, images) <- lift . lift $ runVtyWidget ctx' child -- TODO can we use a local-based implementation?
280− let images' = liftA2 (\r is -> map (withinImage r) is) reg images
281− tellImages images'
282− return result
283− where
284− filterInput :: Region -> Bool -> VtyEvent -> Maybe VtyEvent
285− filterInput (Region l t w h) focused e = case e of
286− V.EvKey _ _ | not focused -> Nothing
287− V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
288− V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
289− _ -> Just e
290− where
291− mouse con x y
292− | or [ x < l
293− , y < t
294− , x >= l + w
295− , y >= t + h ] = Nothing
296− | otherwise =
297− Just (con (x - l) (y - t))
298−
299−-- | Information about a drag operation
300−data Drag = Drag
301− { _drag_from :: (Int, Int) -- ^ Where the drag began
302− , _drag_to :: (Int, Int) -- ^ Where the mouse currently is
303− , _drag_button :: V.Button -- ^ Which mouse button is dragging
304− , _drag_modifiers :: [V.Modifier] -- ^ What modifiers are held
305− , _drag_end :: Bool -- ^ Whether the drag ended (the mouse button was released)
306− }
307− deriving (Eq, Ord, Show)
308−
309−-- | Converts raw vty mouse drag events into an event stream of 'Drag's
310−drag
311− :: (Reflex t, MonadFix m, MonadHold t m, HasVtyInput t m)
312− => V.Button
313− -> m (Event t Drag)
314−drag btn = do
315− inp <- input
316− let f :: Maybe Drag -> V.Event -> Maybe Drag
317− f Nothing = \case
318− V.EvMouseDown x y btn' mods
319− | btn == btn' -> Just $ Drag (x,y) (x,y) btn' mods False
320− | otherwise -> Nothing
321− _ -> Nothing
322− f (Just (Drag from _ _ mods end)) = \case
323− V.EvMouseDown x y btn' mods'
324− | end && btn == btn' -> Just $ Drag (x,y) (x,y) btn' mods' False
325− | btn == btn' -> Just $ Drag from (x,y) btn mods' False
326− | otherwise -> Nothing -- Ignore other buttons.
327− V.EvMouseUp x y (Just btn')
328− | end -> Nothing
329− | btn == btn' -> Just $ Drag from (x,y) btn mods True
330− | otherwise -> Nothing
331− V.EvMouseUp x y Nothing -- Terminal doesn't specify mouse up button,
332− -- assume it's the right one.
333− | end -> Nothing
334− | otherwise -> Just $ Drag from (x,y) btn mods True
335− _ -> Nothing
336− rec let newDrag = attachWithMaybe f (current dragD) inp
337− dragD <- holdDyn Nothing $ Just <$> newDrag
338− return (fmapMaybe id $ updated dragD)
339−
340−-- | Mouse down events for a particular mouse button
341−mouseDown
342− :: (Reflex t, Monad m, HasVtyInput t m)
343− => V.Button
344− -> m (Event t MouseDown)
345−mouseDown btn = do
346− i <- input
347− return $ fforMaybe i $ \case
348− V.EvMouseDown x y btn' mods -> if btn == btn'
349− then Just $ MouseDown btn' (x, y) mods
350− else Nothing
351− _ -> Nothing
352−
353−-- | Mouse up events for a particular mouse button
354−mouseUp
355− :: (Reflex t, Monad m, HasVtyInput t m)
356− => m (Event t MouseUp)
357−mouseUp = do
358− i <- input
359− return $ fforMaybe i $ \case
360− V.EvMouseUp x y btn' -> Just $ MouseUp btn' (x, y)
361− _ -> Nothing
362−
363−-- | Information about a mouse down event
364−data MouseDown = MouseDown
365− { _mouseDown_button :: V.Button
366− , _mouseDown_coordinates :: (Int, Int)
367− , _mouseDown_modifiers :: [V.Modifier]
368− }
369− deriving (Eq, Ord, Show)
370−
371−-- | Information about a mouse up event
372−data MouseUp = MouseUp
373− { _mouseUp_button :: Maybe V.Button
374− , _mouseUp_coordinates :: (Int, Int)
375− }
376− deriving (Eq, Ord, Show)
377−
378−-- | Mouse scroll direction
379−data ScrollDirection = ScrollDirection_Up | ScrollDirection_Down
380− deriving (Eq, Ord, Show)
381−
382−-- | Produce an event that fires when the mouse wheel is scrolled
383−mouseScroll
384− :: (Reflex t, Monad m, HasVtyInput t m)
385− => m (Event t ScrollDirection)
386−mouseScroll = do
387− up <- mouseDown V.BScrollUp
388− down <- mouseDown V.BScrollDown
389− return $ leftmost
390− [ ScrollDirection_Up <$ up
391− , ScrollDirection_Down <$ down
392− ]
393−
394−-- | Type synonym for a key and modifier combination
395−type KeyCombo = (V.Key, [V.Modifier])
396−
397−-- | Emits an event that fires on a particular key press (without modifiers)
398−key :: (Monad m, Reflex t, HasVtyInput t m) => V.Key -> m (Event t KeyCombo)
399−key = keyCombos . Set.singleton . (,[])
400−
401−-- | Emits an event that fires on particular key presses (without modifiers)
402−keys :: (Monad m, Reflex t, HasVtyInput t m) => [V.Key] -> m (Event t KeyCombo)
403−keys = keyCombos . Set.fromList . fmap (,[])
404−
405−-- | Emit an event that fires whenever the provided key combination occurs
406−keyCombo
407− :: (Reflex t, Monad m, HasVtyInput t m)
408− => KeyCombo
409− -> m (Event t KeyCombo)
410−keyCombo = keyCombos . Set.singleton
411−
412−-- | Emit an event that fires whenever any of the provided key combinations occur
413−keyCombos
414− :: (Reflex t, Monad m, HasVtyInput t m)
415− => Set KeyCombo
416− -> m (Event t KeyCombo)
417−keyCombos ks = do
418− i <- input
419− return $ fforMaybe i $ \case
420− V.EvKey k m -> if Set.member (k, m) ks
421− then Just (k, m)
422− else Nothing
423− _ -> Nothing
424−
425−-- | A plain split of the available space into vertically stacked panes.
426−-- No visual separator is built in here.
427−splitV :: (Reflex t, Monad m, MonadNodeId m)
428− => Dynamic t (Int -> Int)
429− -- ^ Function used to determine size of first pane based on available size
430− -> Dynamic t (Bool, Bool)
431− -- ^ How to focus the two sub-panes, given that we are focused.
432− -> VtyWidget t m a
433− -- ^ Widget for first pane
434− -> VtyWidget t m b
435− -- ^ Widget for second pane
436− -> VtyWidget t m (a,b)
437−splitV sizeFunD focD wA wB = do
438− dw <- displayWidth
439− dh <- displayHeight
440− let regA = Region 0 0 <$> dw <*> (sizeFunD <*> dh)
441− regB = Region 0 <$> (_region_height <$> regA) <*> dw <*> liftA2 (-) dh (_region_height <$> regA)
442− ra <- pane regA (fst <$> focD) wA
443− rb <- pane regB (snd <$> focD) wB
444− return (ra,rb)
445−
446−-- | A plain split of the available space into horizontally stacked panes.
447−-- No visual separator is built in here.
448−splitH :: (Reflex t, Monad m, MonadNodeId m)
449− => Dynamic t (Int -> Int)
450− -- ^ Function used to determine size of first pane based on available size
451− -> Dynamic t (Bool, Bool)
452− -- ^ How to focus the two sub-panes, given that we are focused.
453− -> VtyWidget t m a
454− -- ^ Widget for first pane
455− -> VtyWidget t m b
456− -- ^ Widget for second pane
457− -> VtyWidget t m (a,b)
458−splitH sizeFunD focD wA wB = do
459− dw <- displayWidth
460− dh <- displayHeight
461− let regA = Region 0 0 <$> (sizeFunD <*> dw) <*> dh
462− regB = Region <$> (_region_width <$> regA) <*> 0 <*> liftA2 (-) dw (_region_width <$> regA) <*> dh
463− liftA2 (,) (pane regA (fmap fst focD) wA) (pane regB (fmap snd focD) wB)
464−
465−-- | A split of the available space into two parts with a draggable separator.
466−-- Starts with half the space allocated to each, and the first pane has focus.
467−-- Clicking in a pane switches focus.
468−splitVDrag :: (Reflex t, MonadFix m, MonadHold t m, MonadNodeId m)
469− => VtyWidget t m ()
470− -> VtyWidget t m a
471− -> VtyWidget t m b
472− -> VtyWidget t m (a,b)
473−splitVDrag wS wA wB = do
474− dh <- displayHeight
475− dw <- displayWidth
476− h0 <- sample $ current dh -- TODO
477− dragE <- drag V.BLeft
478− let splitter0 = h0 `div` 2
479− rec splitterCheckpoint <- holdDyn splitter0 $ leftmost [fst <$> ffilter snd dragSplitter, resizeSplitter]
480− splitterPos <- holdDyn splitter0 $ leftmost [fst <$> dragSplitter, resizeSplitter]
481− splitterFrac <- holdDyn ((1::Double) / 2) $ ffor (attach (current dh) (fst <$> dragSplitter)) $ \(h, x) ->
482− fromIntegral x / max 1 (fromIntegral h)
483− let dragSplitter = fforMaybe (attach (current splitterCheckpoint) dragE) $
484− \(splitterY, Drag (_, fromY) (_, toY) _ _ end) ->
485− if splitterY == fromY then Just (toY, end) else Nothing
486− regA = Region 0 0 <$> dw <*> splitterPos
487− regS = Region 0 <$> splitterPos <*> dw <*> 1
488− regB = Region 0 <$> (splitterPos + 1) <*> dw <*> (dh - splitterPos - 1)
489− resizeSplitter = ffor (attach (current splitterFrac) (updated dh)) $
490− \(frac, h) -> round (frac * fromIntegral h)
491− focA <- holdDyn True $ leftmost
492− [ True <$ mA
493− , False <$ mB
494− ]
495− (mA, rA) <- pane regA focA $ withMouseDown wA
496− pane regS (pure False) wS
497− (mB, rB) <- pane regB (not <$> focA) $ withMouseDown wB
498− return (rA, rB)
499− where
500− withMouseDown x = do
501− m <- mouseDown V.BLeft
502− x' <- x
503− return (m, x')
504−
505−-- | Fill the background with a particular character.
506−fill :: (Reflex t, Monad m) => Char -> VtyWidget t m ()
507−fill c = do
508− dw <- displayWidth
509− dh <- displayHeight
510− let fillImg = current $ liftA2 (\w h -> [V.charFill V.defAttr c w h]) dw dh
511− tellImages fillImg
512−
513−-- | Fill the background with the bottom
514−hRule :: (Reflex t, Monad m) => BoxStyle -> VtyWidget t m ()
515−hRule boxStyle = fill (_boxStyle_s boxStyle)
516−
517−-- | Defines a set of symbols to use to draw the outlines of boxes
518−-- C.f. https://en.wikipedia.org/wiki/Box-drawing_character
519−data BoxStyle = BoxStyle
520− { _boxStyle_nw :: Char
521− , _boxStyle_n :: Char
522− , _boxStyle_ne :: Char
523− , _boxStyle_e :: Char
524− , _boxStyle_se :: Char
525− , _boxStyle_s :: Char
526− , _boxStyle_sw :: Char
527− , _boxStyle_w :: Char
528− }
529−
530−instance Default BoxStyle where
531− def = singleBoxStyle
532−
533−-- | A box style that uses hyphens and pipe characters. Doesn't handle
534−-- corners very well.
535−hyphenBoxStyle :: BoxStyle
536−hyphenBoxStyle = BoxStyle '-' '-' '-' '|' '-' '-' '-' '|'
537−
538−-- | A single line box style
539−singleBoxStyle :: BoxStyle
540−singleBoxStyle = BoxStyle '┌' '─' '┐' '│' '┘' '─' '└' '│'
541−
542−-- | A thick single line box style
543−thickBoxStyle :: BoxStyle
544−thickBoxStyle = BoxStyle '┏' '━' '┓' '┃' '┛' '━' '┗' '┃'
545−
546−-- | A double line box style
547−doubleBoxStyle :: BoxStyle
548−doubleBoxStyle = BoxStyle '╔' '═' '╗' '║' '╝' '═' '╚' '║'
549−
550−-- | A single line box style with rounded corners
551−roundedBoxStyle :: BoxStyle
552−roundedBoxStyle = BoxStyle '╭' '─' '╮' '│' '╯' '─' '╰' '│'
553−
554−-- | Draws a titled box in the provided style and a child widget inside of that box
555−boxTitle :: (Monad m, Reflex t, MonadNodeId m)
556− => Behavior t BoxStyle
557− -> Text
558− -> VtyWidget t m a
559− -> VtyWidget t m a
560−boxTitle boxStyle title child = do
561− dh <- displayHeight
562− dw <- displayWidth
563− let boxReg = Region 0 0 <$> dw <*> dh
564− innerReg = Region 1 1 <$> (subtract 2 <$> dw) <*> (subtract 2 <$> dh)
565− tellImages (boxImages <$> boxStyle <*> current boxReg)
566− tellImages (fmap (\r -> [regionBlankImage r]) (current innerReg))
567− pane innerReg (pure True) child
568− where
569− boxImages :: BoxStyle -> Region -> [Image]
570− boxImages style (Region left top width height) =
571− let right = left + width - 1
572− bottom = top + height - 1
573− sides =
574− [ withinImage (Region (left + 1) top (width - 2) 1) $
575− V.text' V.defAttr $
576− hPadText title (_boxStyle_n style) (width - 2)
577− , withinImage (Region right (top + 1) 1 (height - 2)) $
578− V.charFill V.defAttr (_boxStyle_e style) 1 (height - 2)
579− , withinImage (Region (left + 1) bottom (width - 2) 1) $
580− V.charFill V.defAttr (_boxStyle_s style) (width - 2) 1
581− , withinImage (Region left (top + 1) 1 (height - 2)) $
582− V.charFill V.defAttr (_boxStyle_w style) 1 (height - 2)
583− ]
584− corners =
585− [ withinImage (Region left top 1 1) $
586− V.char V.defAttr (_boxStyle_nw style)
587− , withinImage (Region right top 1 1) $
588− V.char V.defAttr (_boxStyle_ne style)
589− , withinImage (Region right bottom 1 1) $
590− V.char V.defAttr (_boxStyle_se style)
591− , withinImage (Region left bottom 1 1) $
592− V.char V.defAttr (_boxStyle_sw style)
593− ]
594− in sides ++ if width > 1 && height > 1 then corners else []
595− hPadText :: T.Text -> Char -> Int -> T.Text
596− hPadText t c l = if lt >= l
597− then t
598− else left <> t <> right
599− where
600− lt = T.length t
601− delta = l - lt
602− mkHalf n = T.replicate (n `div` 2) (T.singleton c)
603− left = mkHalf $ delta + 1
604− right = mkHalf delta
605−
606−-- | A box without a title
607−box :: (Monad m, Reflex t, MonadNodeId m)
608− => Behavior t BoxStyle
609− -> VtyWidget t m a
610− -> VtyWidget t m a
611−box boxStyle = boxTitle boxStyle mempty
612−
613−-- | A box whose style is static
614−boxStatic
615− :: (Reflex t, Monad m, MonadNodeId m)
616− => BoxStyle
617− -> VtyWidget t m a
618− -> VtyWidget t m a
619−boxStatic = box . pure
620−
621−-- | Configuration options for displaying "rich" text
622−data RichTextConfig t = RichTextConfig
623− { _richTextConfig_attributes :: Behavior t V.Attr
624− }
625−
626−instance Reflex t => Default (RichTextConfig t) where
627− def = RichTextConfig $ pure V.defAttr
628−
629−-- | A widget that displays text with custom time-varying attributes
630−richText
631− :: (Reflex t, Monad m)
632− => RichTextConfig t
633− -> Behavior t Text
634− -> VtyWidget t m ()
635−richText cfg t = do
636− dw <- displayWidth
637− let img = (\w a s -> [wrapText w a s])
638− <$> current dw
639− <*> _richTextConfig_attributes cfg
640− <*> t
641− tellImages img
642− where
643− wrapText maxWidth attrs = V.vertCat
644− . concatMap (fmap (V.string attrs . T.unpack) . TZ.wrapWithOffset maxWidth 0)
645− . T.split (=='\n')
646−
647−-- | Renders text, wrapped to the container width
648−text
649− :: (Reflex t, Monad m)
650− => Behavior t Text
651− -> VtyWidget t m ()
652−text = richText def
653−
654−-- | Scrollable text widget. The output pair exposes the current scroll position and total number of lines (including those
655−-- that are hidden)
656−scrollableText
657− :: forall t m. (Reflex t, MonadHold t m, MonadFix m)
658− => Event t Int
659− -- ^ Number of lines to scroll by
660− -> Behavior t Text
661− -> VtyWidget t m (Behavior t (Int, Int))
662− -- ^ (Current scroll position, total number of lines)
663−scrollableText scrollBy t = do
664− dw <- displayWidth
665− let imgs = wrap <$> current dw <*> t
666− kup <- key V.KUp
667− kdown <- key V.KDown
668− m <- mouseScroll
669− let requestedScroll :: Event t Int
670− requestedScroll = leftmost
671− [ 1 <$ kdown
672− , (-1) <$ kup
673− , ffor m $ \case
674− ScrollDirection_Up -> (-1)
675− ScrollDirection_Down -> 1
676− , scrollBy
677− ]
678− updateLine maxN delta ix = min (max 0 (ix + delta)) maxN
679− lineIndex :: Dynamic t Int <- foldDyn (\(maxN, delta) ix -> updateLine (maxN - 1) delta ix) 0 $
680− attach (length <$> imgs) requestedScroll
681− tellImages $ fmap ((:[]) . V.vertCat) $ drop <$> current lineIndex <*> imgs
682− return $ (,) <$> ((+) <$> current lineIndex <*> pure 1) <*> (length <$> imgs)
683− where
684− wrap maxWidth = concatMap (fmap (V.string V.defAttr . T.unpack) . TZ.wrapWithOffset maxWidth 0) . T.split (=='\n')
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
685556
686−-- | Renders any behavior whose value can be converted to
687−-- 'String' as text
688−display
689− :: (Reflex t, Monad m, Show a)
690− => Behavior t a
691− -> VtyWidget t m ()
692−display a = text $ T.pack . show <$> a
557+-- * Misc
693558
694559-- | A widget that draws nothing
695−blank :: Monad m => VtyWidget t m ()
560+blank :: Monad m => m ()
696561blank = return ()