@@ -1,103 +1,43 @@
1โ{-# LANGUAGE FlexibleContexts #-}
1+{-|
2โ{-# LANGUAGE FlexibleInstances #-}
2+Module: Reflex.Vty.Widget
3โ{-# LANGUAGE FunctionalDependencies #-}
3+Description: Basic set of widgets and building blocks for reflex-vty applications
4โ{-# LANGUAGE GeneralizedNewtypeDeriving #-}
4+-}
5โ{-# LANGUAGE LambdaCase #-}
5+{-# Language UndecidableInstances #-}
6โ{-# LANGUAGE MultiParamTypeClasses #-}
6+
7โ{-# LANGUAGE RankNTypes #-}
8โ{-# LANGUAGE RecursiveDo #-}
9โ{-# LANGUAGE TypeFamilies #-}
10โmodule Reflex.Vty.Widget
7+module Reflex.Vty.Widget where
16โ , mainWidgetWithHandle
17โ , HasDisplaySize(..)
47import Control.Applicative (liftA2)
9import Control.Applicative (liftA2)
48import Control.Monad.Fix (MonadFix)
10import Control.Monad.Fix (MonadFix)
49โimport Control.Monad.Trans (lift)
11+import Control.Monad.IO.Class (MonadIO)
50โimport Control.Monad.Trans.Reader (ReaderT, runReaderT, asks, ask)
12+import Control.Monad.Morph
13+import Control.Monad.NodeId
14+import Control.Monad.Reader (ReaderT, ask, local, runReaderT)
15+import Control.Monad.Ref
51โimport Control.Monad.Trans.Writer (WriterT, runWriterT, censor, tell)
16+import Control.Monad.Trans (MonadTrans, lift)
18+import qualified Data.Set as Set
52โimport Graphics.Vty (Image, Attr)
19+import Graphics.Vty (Image)
53โimport qualified Graphics.Vty as V
20+import qualified Graphics.Vty as V
54import Reflex
21import Reflex
55โ
22+import Reflex.Class ()
23+import Reflex.Host.Class (MonadReflexCreateTrigger)
56import Reflex.Vty.Host
24import Reflex.Vty.Host
58โ-- | The context within which a 'VtyWidget' runs
26+-- * Running a vty application
59โdata VtyWidgetCtx t = VtyWidgetCtx
27+
60โ { _vtyWidgetCtx_size :: Dynamic t (Int,Int)
61โ -- ^ The width and height of the region allocated to the widget.
62โ , _vtyWidgetCtx_focus :: Dynamic t Bool
63โ -- ^ Whether the widget should behave as if it has focus for keyboard input.
64โ , _vtyWidgetCtx_input :: Event t VtyEvent
65โ -- ^ User input events that the widget's parent chooses to share. These will generally
66โ -- be filtered for relevance:
67โ -- * Keyboard inputs are restricted to focused widgets
68โ -- * Mouse inputs are restricted to the region in which the widget resides and are
69โ -- translated into its internal coordinates.
72โ-- | The output of a 'VtyWidget'
73โdata VtyWidgetOut t = VtyWidgetOut
74โ { _vtyWidgetOut_images :: Behavior t [Image]
75โ -- ^ The visual output of the 'VtyWidget'
76โ , _vtyWidgetOut_shutdown :: Event t ()
79โinstance Reflex t => Semigroup (VtyWidgetOut t) where
80โ wo <> wo' = VtyWidgetOut
81โ { _vtyWidgetOut_images = _vtyWidgetOut_images wo <> _vtyWidgetOut_images wo'
82โ , _vtyWidgetOut_shutdown = _vtyWidgetOut_shutdown wo <> _vtyWidgetOut_shutdown wo'
85โinstance (Reflex t) => Monoid (VtyWidgetOut t) where
86โ mempty = VtyWidgetOut mempty mempty
87โ mappend wo wo' = wo <> wo'
89โnewtype VtyWidget t m a = VtyWidget { unVtyWidget :: WriterT (VtyWidgetOut t) (ReaderT (VtyWidgetCtx t) m) a }
90โ deriving (Functor, Applicative, Monad, MonadSample t, MonadHold t, MonadFix)
92โ-- | Runs a 'VtyWidget' with a given context
93โrunVtyWidget :: (Reflex t)
96โ -> m (a, VtyWidgetOut t)
97โrunVtyWidget ctx w = runReaderT (runWriterT (unVtyWidget w)) ctx
99โ-- | 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
100โmainWidgetWithHandle :: V.Vty -> (forall t m. MonadVtyApp t m => VtyWidget t m ()) -> IO ()
29+mainWidgetWithHandle
35+ , HasDisplayRegion t m
101mainWidgetWithHandle vty child =
41mainWidgetWithHandle vty child =
102 runVtyAppWithHandle vty $ \dr0 inp -> do
42 runVtyAppWithHandle vty $ \dr0 inp -> do
103 size <- holdDyn dr0 $ fforMaybe inp $ \case
43 size <- holdDyn dr0 $ fforMaybe inp $ \case
@@ -106,59 +46,180 @@ mainWidgetWithHandle vty child =
106 let inp' = fforMaybe inp $ \case
46 let inp' = fforMaybe inp $ \case
107 V.EvResize {} -> Nothing
47 V.EvResize {} -> Nothing
108 x -> Just x
48 x -> Just x
109โ let ctx = VtyWidgetCtx
49+ (shutdown, images) <- runThemeReader (constant V.defAttr) $
110โ { _vtyWidgetCtx_size = size
50+ runFocusReader (pure True) $
111โ , _vtyWidgetCtx_input = inp'
51+ runDisplayRegion (fmap (\(w, h) -> Region 0 0 w h) size) $
112โ , _vtyWidgetCtx_focus = constDyn True
52+ runImageWriter $
114โ ((), wo) <- runVtyWidget ctx child
54+ runInput inp' $ do
55+ tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
115 return $ VtyResult
57 return $ VtyResult
116โ { _vtyResult_picture = fmap (V.picForLayers . reverse) (_vtyWidgetOut_images wo)
58+ { _vtyResult_picture = fmap (V.picForLayers . reverse) images
117โ , _vtyResult_shutdown = _vtyWidgetOut_shutdown wo
59+ , _vtyResult_shutdown = shutdown
62+-- | The output of a vty widget
63+data VtyWidgetOut t = VtyWidgetOut
64+ { _vtyWidgetOut_shutdown :: Event t ()
120-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
67-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
121โmainWidget :: (forall t m. MonadVtyApp t m => VtyWidget t m ()) -> IO ()
70+ ( MonadVtyApp t m
73+ , HasDisplayRegion t m
122mainWidget child = do
79mainWidget child = do
123 vty <- getDefaultVty
80 vty <- getDefaultVty
124 mainWidgetWithHandle vty child
81 mainWidgetWithHandle vty child
126โclass (Reflex t, Monad m) => HasDisplaySize t m | m -> t where
83+-- * Input Events
127โ displaySize :: m (Dynamic t (Int, Int))
129โinstance (Reflex t, Monad m) => HasDisplaySize t (VtyWidget t m) where
130โ displaySize = VtyWidget . lift $ asks _vtyWidgetCtx_size
132โdisplayWidth :: HasDisplaySize t m => m (Dynamic t Int)
133โdisplayWidth = fmap fst <$> displaySize
135โdisplayHeight :: HasDisplaySize t m => m (Dynamic t Int)
85+-- | A class for things that can receive vty events as input
136โdisplayHeight = fmap snd <$> displaySize
138โclass HasVtyInput t m | m -> t where
86+class HasInput t m | m -> t where
139 input :: m (Event t VtyEvent)
87 input :: m (Event t VtyEvent)
88+ default input :: (f m' ~ m, Monad m', MonadTrans f, HasInput t m') => m (Event t VtyEvent)
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)
96+instance (Reflex t, Monad m) => HasInput t (Input t m) where
98+ localInput f (Input m) = Input $ local f m
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
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'
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)
132+instance MonadTrans (Input t) where
133+ lift f = Input $ lift f
135+instance MFunctor (Input t) where
136+ hoist f = Input . hoist f . unInput
138+instance MonadNodeId m => MonadNodeId (Input t m)
140+-- | Runs an 'Input' with a given context
146+runInput e w = runReaderT (unInput w) e
148+-- ** Filtering input
150+-- | Type synonym for a key and modifier combination
151+type KeyCombo = (V.Key, [V.Modifier])
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 . (,[])
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 (,[])
161+-- | Emit an event that fires whenever the provided key combination occurs
163+ :: (Reflex t, Monad m, HasInput t m)
165+ -> m (Event t KeyCombo)
166+keyCombo = keyCombos . Set.singleton
168+-- | Emit an event that fires whenever any of the provided key combinations occur
170+ :: (Reflex t, Monad m, HasInput t m)
172+ -> m (Event t KeyCombo)
175+ return $ fforMaybe i $ \case
176+ V.EvKey k m -> if Set.member (k, m) ks
141โinstance (Reflex t, Monad m) => HasVtyInput t (VtyWidget t m) where
181+-- | Filter the keyboard input that a child widget may receive
142โ input = VtyWidget . lift $ asks _vtyWidgetCtx_input
182+filterKeys :: (Reflex t, HasInput t m) => (KeyCombo -> Bool) -> m a -> m a
143โ
183+filterKeys f x = localInput (ffilter (\case
144โclass HasFocus t m | m -> t where
184+ V.EvKey k mods -> f (k, mods)
145โ focus :: m (Dynamic t Bool)
185+ _ -> True)) x
147โinstance (Reflex t, Monad m) => HasFocus t (VtyWidget t m) where
187+-- | Filter mouse input events based on whether they target a particular region
148โ focus = VtyWidget . lift $ asks _vtyWidgetCtx_focus
188+-- and translate them to the internal coordinate system of that region.
150โclass (Reflex t, Monad m) => ImageWriter t m | m -> t where
190+-- NB: Non-mouse events are passed through unfiltered and unchanged
151โ tellImages :: Behavior t [Image] -> m ()
191+mouseInRegion :: Region -> VtyEvent -> Maybe VtyEvent
152โ
192+mouseInRegion (Region l t w h) e = case e of
153โinstance (Reflex t, Monad m) => ImageWriter t (VtyWidget t m) where
193+ V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
154โ tellImages imgs = VtyWidget $ tell (mempty { _vtyWidgetOut_images = imgs })
194+ V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
156โclass (Reflex t, Monad m) => Shutdown t m where
196+ where
157โ tellShutdown :: Event t () -> m ()
197+ mouse con x y
201+ , y >= t + h ] = Nothing
203+ Just (con (x - l) (y - t))
205+-- | Filter mouse input outside the current display region and
206+-- all input if the region is not focused
208+ :: (HasDisplayRegion t m, HasFocusReader t m, HasInput t m)
209+ => m (Event t VtyEvent)
210+inputInFocusedRegion = do
212+ reg <- current <$> askRegion
213+ foc <- current <$> focus
214+ pure $ fmapMaybe id $ attachWith filterInput ((,) <$> reg <*> foc) inp
216+ filterInput (r, f) = \case
217+ V.EvKey {} | not f -> Nothing
218+ x -> mouseInRegion r x
159โinstance (Reflex t, Monad m) => Shutdown t (VtyWidget t m) where
220+-- * Getting and setting the display region
160โ tellShutdown sd = VtyWidget $ tell (mempty { _vtyWidgetOut_shutdown = sd })
222+-- | A chunk of the display area
162data Region = Region
223data Region = Region
163 { _region_left :: Int
224 { _region_left :: Int
164 , _region_top :: Int
225 , _region_top :: Int
@@ -167,257 +228,334 @@ data Region = Region
168 deriving (Show, Read, Eq, Ord)
229 deriving (Show, Read, Eq, Ord)
231+-- | A region that occupies no space.
233+nilRegion = Region 0 0 0 0
235+-- | The width and height of a 'Region'
170regionSize :: Region -> (Int, Int)
236regionSize :: Region -> (Int, Int)
171regionSize (Region _ _ w h) = (w, h)
237regionSize (Region _ _ w h) = (w, h)
173โpane
239+-- | Produces an 'Image' that fills a region with space characters
174โ :: (Reflex t, Monad m)
240+regionBlankImage :: V.Attr -> Region -> Image
175โ => Dynamic t Region -- ^ Region into which we should draw the widget (in coordinates relative to our own)
241+regionBlankImage attr r@(Region _ _ width height) =
176โ -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
242+ withinImage r $ V.charFill attr ' ' width height
177โ -> VtyWidget t m a
243+
178โ -> VtyWidget t m a
244+-- | A class for things that know their own display size dimensions
179โpane reg foc child = VtyWidget $ do
245+class (Reflex t, Monad m) => HasDisplayRegion t m | m -> t where
180โ ctx <- lift ask
246+ -- | Retrieve the display region
181โ let ctx' = VtyWidgetCtx
247+ askRegion :: m (Dynamic t Region)
182โ { _vtyWidgetCtx_input = leftmost -- TODO: think about this leftmost more.
248+ default askRegion :: (f m' ~ m, MonadTrans f, HasDisplayRegion t m') => m (Dynamic t Region)
183โ [ fmapMaybe id $
249+ askRegion = lift askRegion
184โ attachWith (\(r,f) e -> filterInput r f e)
250+ -- | Run an action in a local region, by applying a transformation to the region
185โ (liftA2 (,) (current reg) (current foc))
251+ localRegion :: (Dynamic t Region -> Dynamic t Region) -> m a -> m a
186โ (_vtyWidgetCtx_input ctx)
252+ default localRegion :: (f m' ~ m, Monad m', MFunctor f, HasDisplayRegion t m') => (Dynamic t Region -> Dynamic t Region) -> m a -> m a
187โ ]
253+ localRegion f = hoist (localRegion f)
188โ , _vtyWidgetCtx_focus = liftA2 (&&) (_vtyWidgetCtx_focus ctx) foc
254+
189โ , _vtyWidgetCtx_size = fmap regionSize reg }
255+-- | Retrieve the display width
190โ (result, wo) <- lift . lift $ runVtyWidget ctx' child
256+displayWidth :: HasDisplayRegion t m => m (Dynamic t Int)
191โ let images = _vtyWidgetOut_images wo
257+displayWidth = fmap _region_width <$> askRegion
192โ images' = liftA2 (\r is -> map (withinImage r) is) (current reg) images
258+
193โ wo' = wo { _vtyWidgetOut_images = images' }
259+-- | Retrieve the display height
194โ tell wo'
260+displayHeight :: HasDisplayRegion t m => m (Dynamic t Int)
195โ return result
261+displayHeight = fmap _region_height <$> askRegion
197โ -- Filters input such that:
263+instance HasDisplayRegion t m => HasDisplayRegion t (ReaderT x m)
198โ -- * unfocused widgets receive no key events
264+instance HasDisplayRegion t m => HasDisplayRegion t (BehaviorWriterT t x m)
199โ -- * mouse inputs outside the region are ignored
265+instance HasDisplayRegion t m => HasDisplayRegion t (DynamicWriterT t x m)
200โ -- * mouse inputs inside the region have their coordinates translated
266+instance HasDisplayRegion t m => HasDisplayRegion t (EventWriterT t x m)
201โ -- such that (0,0) is the top-left corner of the region
267+instance HasDisplayRegion t m => HasDisplayRegion t (NodeIdT m)
202โ filterInput :: Region -> Bool -> VtyEvent -> Maybe VtyEvent
268+
203โ filterInput (Region l t w h) focused e = case e of
269+-- | A widget that has access to a particular region of the vty display
204โ V.EvKey _ _ | not focused -> Nothing
270+newtype DisplayRegion t m a = DisplayRegion
205โ V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
271+ { unDisplayRegion :: ReaderT (Dynamic t Region) m a }
206โ V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
272+ deriving
207โ _ -> Just e
273+ ( Functor
208โ where
274+ , Applicative
209โ mouse con x y
275+ , Monad
210โ | or [ x < l
276+ , MonadFix
211โ , y < t
277+ , MonadHold t
212โ , x >= l + w
278+ , MonadIO
213โ , y >= t + h ] = Nothing
279+ , MonadRef
214โ | otherwise =
280+ , MonadSample t
215โ Just (con (x - l) (y - t))
281+ )
217โdata Drag = Drag
283+instance (Monad m, Reflex t) => HasDisplayRegion t (DisplayRegion t m) where
218โ { _drag_from :: (Int, Int) -- ^ Where the drag began
284+ askRegion = DisplayRegion ask
219โ , _drag_to :: (Int, Int) -- ^ Where the mouse currently is
285+ localRegion f = DisplayRegion . local f . unDisplayRegion
220โ , _drag_button :: V.Button -- ^ Which mouse button is dragging
286+
221โ , _drag_modifiers :: [V.Modifier] -- ^ What modifiers are held
287+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (DisplayRegion t m)
222โ , _drag_end :: Bool -- ^ Whether the drag ended (the mouse button was released)
288+deriving instance NotReady t m => NotReady t (DisplayRegion t m)
223โ }
289+deriving instance PerformEvent t m => PerformEvent t (DisplayRegion t m)
224โ deriving (Eq, Ord, Show)
290+deriving instance PostBuild t m => PostBuild t (DisplayRegion t m)
225โ
291+deriving instance TriggerEvent t m => TriggerEvent t (DisplayRegion t m)
226โdrag
292+instance HasImageWriter t m => HasImageWriter t (DisplayRegion t m)
293+instance HasFocusReader t m => HasFocusReader t (DisplayRegion t m)
227โ :: (Reflex t, MonadFix m, MonadHold t m)
295+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (DisplayRegion t m) where
228โ => V.Button
296+ runWithReplace (DisplayRegion a) e = DisplayRegion $ runWithReplace a $ fmap unDisplayRegion e
229โ -> VtyWidget t m (Event t Drag)
297+ traverseIntMapWithKeyWithAdjust f m e = DisplayRegion $ traverseIntMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
230โdrag btn = do
298+ traverseDMapWithKeyWithAdjust f m e = DisplayRegion $ traverseDMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
231โ inp <- input
299+ traverseDMapWithKeyWithAdjustWithMove f m e = DisplayRegion $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unDisplayRegion $ f k v) m e
232โ let f :: Drag -> V.Event -> Maybe Drag
300+
233โ f (Drag from _ _ mods end) = \case
301+instance MonadTrans (DisplayRegion t) where
234โ V.EvMouseDown x y btn' mods'
302+ lift = DisplayRegion . lift
235โ | end -> Just $ Drag (x,y) (x,y) btn' mods' False
303+
236โ | btn == btn' -> Just $ Drag from (x,y) btn mods' False
304+instance MFunctor (DisplayRegion t) where
237โ | otherwise -> Nothing -- Ignore other buttons.
305+ hoist f = DisplayRegion . hoist f . unDisplayRegion
238โ V.EvMouseUp x y (Just btn')
306+
239โ | end -> Nothing
307+instance MonadNodeId m => MonadNodeId (DisplayRegion t m)
240โ | btn == btn' -> Just $ Drag from (x,y) btn mods True
308+
241โ | otherwise -> Nothing
309+-- | Run a 'DisplayRegion' action with a given 'Region'
242โ V.EvMouseUp x y Nothing -- Terminal doesn't specify mouse up button,
310+runDisplayRegion
243โ -- assume it's the right one.
245โ | otherwise -> Just $ Drag from (x,y) btn mods True
247โ rec let newDrag = attachWithMaybe f (current dragD) inp
248โ dragD <- holdDyn (Drag (0,0) (0,0) btn [] True) -- gross, but ok because it'll never be produced.
250โ return (updated dragD)
253 :: (Reflex t, Monad m)
311 :: (Reflex t, Monad m)
254โ => V.Button
312+ => Dynamic t Region
255โ -> VtyWidget t m (Event t VtyEvent)
313+ -> DisplayRegion t m a
256โmouseDown btn = do
314+ -> m a
257โ i <- input
315+runDisplayRegion r = flip runReaderT r . unDisplayRegion
258โ return $ fforMaybe i $ \x -> case x of
259โ V.EvMouseDown _ _ btn' _ -> if btn == btn' then Just x else Nothing
262โ-- | A plain split of the available space into vertically stacked panes.
317+-- * Getting focus state
263โ-- No visual separator is built in here.
264โsplitV :: (Reflex t, Monad m)
265โ => Dynamic t (Int -> Int)
266โ -- ^ Function used to determine size of first pane based on available size
267โ -> Dynamic t (Bool, Bool)
268โ -- ^ How to focus the two sub-panes, given that we are focused.
269โ -> VtyWidget t m a
270โ -- ^ Widget for first pane
271โ -> VtyWidget t m b
272โ -- ^ Widget for second pane
273โ -> VtyWidget t m (a,b)
274โsplitV sizeFunD focD wA wB = do
276โ let regA = (\f (w,h) -> Region 0 0 w (f h)) <$> sizeFunD <*> sz
277โ regB = (\(w,h) (Region _ _ _ hA) -> Region 0 hA w (h - hA)) <$> sz <*> regA
278โ ra <- pane regA (fst <$> focD) wA
279โ rb <- pane regB (snd <$> focD) wB
282โ-- | A split of the available space into two parts with a draggable separator.
283โ-- Starts with half the space allocated to each, and the first pane has focus.
284โ-- Clicking in a pane switches focus.
285โsplitVDrag :: (Reflex t, MonadFix m, MonadHold t m)
286โ => VtyWidget t m ()
287โ -> VtyWidget t m a
288โ -> VtyWidget t m b
289โ -> VtyWidget t m (a,b)
290โsplitVDrag wS wA wB = do
292โ (_, h0) <- sample $ current sz
293โ dragE <- drag V.BLeft
294โ let splitter0 = h0 `div` 2
295โ rec splitterCheckpoint <- holdDyn splitter0 $ leftmost [fst <$> ffilter snd dragSplitter, resizeSplitter]
296โ splitterPos <- holdDyn splitter0 $ leftmost [fst <$> dragSplitter, resizeSplitter]
297โ splitterFrac <- holdDyn (1/2) $ ffor (attach (current sz) (fst <$> dragSplitter)) $ \((_,h),x) ->
298โ fromIntegral x / fromIntegral h
299โ let dragSplitter = fforMaybe (attach (current splitterCheckpoint) dragE) $
300โ \(splitterY, Drag (_, fromY) (_, toY) _ _ end) ->
301โ if splitterY == fromY then Just (toY, end) else Nothing
302โ regA = (\(w,_) sp -> Region 0 0 w sp) <$> sz <*> splitterPos
303โ regS = (\(w,_) sp -> Region 0 sp w 1) <$> sz <*> splitterPos
304โ regB = (\(w,h) sp -> Region 0 (sp + 1) w (h - sp - 1)) <$> sz <*> splitterPos
305โ resizeSplitter = ffor (attach (current splitterFrac) (updated sz)) $
306โ \(frac, (_,h)) -> round (frac * fromIntegral h)
307โ focA <- holdDyn True $ leftmost
311โ (mA, rA) <- pane regA focA $ withMouseDown wA
312โ pane regS (pure False) wS
313โ (mB, rB) <- pane regB (not <$> focA) $ withMouseDown wB
316โ withMouseDown x = do
317โ m <- mouseDown V.BLeft
321โ-- | Fill the background with a particular character.
322โfill :: (Reflex t, Monad m) => Char -> VtyWidget t m ()
325โ let fillImg = ffor (current sz) $ \(w,h) -> [V.charFill mempty c w h]
326โ tellImages fillImg
328โ-- | Fill the background with the bottom
329โhRule :: (Reflex t, Monad m) => BoxStyle -> VtyWidget t m ()
330โhRule boxStyle = fill (_boxStyle_s boxStyle)
332โfractionSz :: Double -> Int -> Int
333โfractionSz x h = round (fromIntegral h * x)
336โ :: (Reflex t, MonadHold t m, MonadFix m)
337โ => Behavior t ([Image] -> [Image])
338โ -> VtyWidget t m a
339โ -> VtyWidget t m a
340โmodifyImages f (VtyWidget w) = VtyWidget $ flip censor w $ \wo ->
341โ wo { _vtyWidgetOut_images = f <*> (_vtyWidgetOut_images wo) }
343โdata BoxStyle = BoxStyle
344โ { _boxStyle_nw :: Char
345โ , _boxStyle_n :: Char
346โ , _boxStyle_ne :: Char
347โ , _boxStyle_e :: Char
348โ , _boxStyle_se :: Char
349โ , _boxStyle_s :: Char
350โ , _boxStyle_sw :: Char
351โ , _boxStyle_w :: Char
354โhyphenBoxStyle :: BoxStyle
319+-- | A class for things that can dynamically gain and lose focus
355โhyphenBoxStyle = BoxStyle '-' '-' '-' '|' '-' '-' '-' '|'
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)
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)
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)
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 }
348+instance (Monad m, Reflex t) => HasFocusReader t (FocusReader t m) where
349+ focus = FocusReader ask
350+ localFocus f = FocusReader . local f . unFocusReader
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)
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
365+instance MonadTrans (FocusReader t) where
366+ lift = FocusReader . lift
368+instance MFunctor (FocusReader t) where
369+ hoist f = FocusReader . hoist f . unFocusReader
371+instance MonadNodeId m => MonadNodeId (FocusReader t m)
373+-- | Run a 'FocusReader' action with the given focus value
375+ :: (Reflex t, Monad m)
377+ -> FocusReader t m a
379+runFocusReader b = flip runReaderT b . unFocusReader
357โsingleBoxStyle :: BoxStyle
381+-- * "Image" output
358โsingleBoxStyle = BoxStyle 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ'
360โthickBoxStyle :: BoxStyle
383+-- | A class for widgets that can produce images to draw to the display
361โthickBoxStyle = BoxStyle 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ'
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)
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 }
405+ , MonadReflexCreateTrigger t
413+instance MonadTrans (ImageWriter t) where
414+ lift = ImageWriter . lift
416+instance MFunctor (ImageWriter t) where
417+ hoist f = ImageWriter . (hoist f) . unImageWriter
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
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)
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
438+instance HasDisplayRegion t m => HasDisplayRegion t (ImageWriter t m)
439+instance HasFocusReader t m => HasFocusReader t (ImageWriter t m)
441+-- | Run a widget that can produce images
443+ :: (Reflex t, Monad m)
444+ => ImageWriter t m a
445+ -> m (a, Behavior t [Image])
446+runImageWriter = runBehaviorWriterT . unImageWriter
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)
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)
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)
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 }
483+instance (Monad m, Reflex t) => HasTheme t (ThemeReader t m) where
484+ theme = ThemeReader ask
485+ localTheme f = ThemeReader . local f . unThemeReader
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)
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
500+instance MonadTrans (ThemeReader t) where
501+ lift = ThemeReader . lift
503+instance MFunctor (ThemeReader t) where
504+ hoist f = ThemeReader . hoist f . unThemeReader
506+instance MonadNodeId m => MonadNodeId (ThemeReader t m)
508+-- | Run a 'ThemeReader' action with the given focus value
510+ :: (Reflex t, Monad m)
511+ => Behavior t V.Attr
512+ -> ThemeReader t m a
514+runThemeReader b = flip runReaderT b . unThemeReader
363โdoubleBoxStyle :: BoxStyle
364โdoubleBoxStyle = BoxStyle 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ' 'โ'
366โroundedBoxStyle :: BoxStyle
517+-- ** Manipulating images
367โroundedBoxStyle = BoxStyle 'โญ' 'โ' 'โฎ' 'โ' 'โฏ' 'โ' 'โฐ' 'โ'
369โbox :: (Monad m, Reflex t)
519+-- | Translates and crops an 'Image' so that it is contained by
370โ => BoxStyle
520+-- the given 'Region'.
371โ -> VtyWidget t m a
372โ -> VtyWidget t m a
373โbox style child = do
375โ let boxReg = ffor (current sz) $ \(w,h) -> Region 0 0 w h
376โ innerReg = ffor sz $ \(w,h) -> Region 1 1 (w - 2) (h - 2)
377โ tellImages (fmap boxImages boxReg)
378โ tellImages (fmap (\r -> [regionBlankImage r]) (current innerReg))
379โ pane innerReg (pure True) child
381โ boxImages :: Region -> [Image]
382โ boxImages r@(Region left top width height) =
383โ let right = left + width - 1
384โ bottom = top + height - 1
386โ [ withinImage (Region (left + 1) top (width - 2) 1) $
387โ V.charFill mempty (_boxStyle_n style) (width - 2) 1
388โ , withinImage (Region right (top + 1) 1 (height - 2)) $
521+withinImage
389โ V.charFill mempty (_boxStyle_e style) 1 (height - 2)
522+ :: Region
390โ , withinImage (Region (left + 1) bottom (width - 2) 1) $
523+ -> Image
391โ V.charFill mempty (_boxStyle_s style) (width - 2) 1
524+ -> Image
392โ , withinImage (Region left (top + 1) 1 (height - 2)) $
393โ V.charFill mempty (_boxStyle_w style) 1 (height - 2)
396โ [ withinImage (Region left top 1 1) $
397โ V.char mempty (_boxStyle_nw style)
398โ , withinImage (Region right top 1 1) $
399โ V.char mempty (_boxStyle_ne style)
400โ , withinImage (Region right bottom 1 1) $
401โ V.char mempty (_boxStyle_se style)
402โ , withinImage (Region left bottom 1 1) $
403โ V.char mempty (_boxStyle_sw style)
405โ in sides ++ if width > 1 && height > 1 then corners else []
407โstring :: (Reflex t, Monad m) => Behavior t String -> VtyWidget t m ()
409โ dw <- displayWidth
410โ let img = (\w s -> [wrapString w mempty s]) <$> current dw <*> msg
413โregionBlankImage :: Region -> Image
414โregionBlankImage r@(Region _ _ width height) =
415โ withinImage r $ wrapString width V.defAttr $ replicate (width * height) ' '
417โwithinImage :: Region -> Image -> Image
418withinImage (Region left top width height)
525withinImage (Region left top width height)
419 | width < 0 || height < 0 = withinImage (Region left top 0 0)
526 | width < 0 || height < 0 = withinImage (Region left top 0 0)
420 | otherwise = V.translate left top . V.crop width height
527 | otherwise = V.translate left top . V.crop width height
422โwrapString :: Int -> Attr -> String -> Image
529+-- | Crop a behavior of images to a behavior of regions. See 'withinImage'.
423โwrapString maxWidth attrs = V.vertCat . concatMap (fmap (V.string attrs) . fmap (take maxWidth) . takeWhile (not . null) . iterate (drop maxWidth)) . lines
530+imagesInRegion
532+ => Behavior t Region
533+ -> Behavior t [Image]
534+ -> Behavior t [Image]
535+imagesInRegion reg = liftA2 (\r is -> map (withinImage r) is) reg
537+-- * Running sub-widgets
539+-- | Low-level widget combinator that runs a child widget within
540+-- a given region and context. This widget filters and modifies the input
541+-- that the child widget receives such that:
542+-- * unfocused widgets receive no key events
543+-- * mouse inputs outside the region are ignored
544+-- * mouse inputs inside the region have their coordinates translated such
545+-- that (0,0) is the top-left corner of the region
547+ :: (Reflex t, Monad m, HasInput t m, HasImageWriter t m, HasDisplayRegion t m, HasFocusReader t m)
549+ -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
552+pane dr foc child = localRegion (const dr) $
553+ mapImages (imagesInRegion $ current dr) $
554+ localFocus (const foc) $
555+ inputInFocusedRegion >>= \e -> localInput (const e) child
559+-- | A widget that draws nothing
560+blank :: Monad m => m ()