@@ -2,176 +2,41 @@
2Module: Reflex.Vty.Widget
2Module: Reflex.Vty.Widget
3Description: Basic set of widgets and building blocks for reflex-vty applications
3Description: Basic set of widgets and building blocks for reflex-vty applications
5−{-# LANGUAGE DefaultSignatures #-}
6−{-# LANGUAGE DeriveFunctor #-}
7−{-# LANGUAGE FlexibleContexts #-}
8−{-# LANGUAGE FlexibleInstances #-}
9−{-# LANGUAGE FunctionalDependencies #-}
10−{-# LANGUAGE GeneralizedNewtypeDeriving #-}
11−{-# LANGUAGE LambdaCase #-}
12−{-# LANGUAGE MultiParamTypeClasses #-}
13−{-# LANGUAGE RankNTypes #-}
14−{-# LANGUAGE RecursiveDo #-}
15−{-# LANGUAGE ScopedTypeVariables #-}
16−{-# LANGUAGE StandaloneDeriving #-}
17−{-# LANGUAGE TupleSections #-}
18−{-# LANGUAGE TypeFamilies #-}
19−{-# LANGUAGE UndecidableInstances #-}
5+{-# Language UndecidableInstances #-}
21−module Reflex.Vty.Widget
7+module Reflex.Vty.Widget where
28− , mainWidgetWithHandle
78import Control.Applicative (liftA2)
9import Control.Applicative (liftA2)
79import Control.Monad.Fix (MonadFix)
10import Control.Monad.Fix (MonadFix)
80−import Control.Monad.Trans.Class
11+import Control.Monad.IO.Class (MonadIO)
81−import Control.Monad.Trans (lift)
12+import Control.Monad.Morph
13+import Control.Monad.NodeId
82−import Control.Monad.Reader
14+import Control.Monad.Reader (ReaderT, ask, local, runReaderT)
83−import Data.Bimap (Bimap)
15+import Control.Monad.Ref
84−import qualified Data.Bimap as Bimap
16+import Control.Monad.Trans (MonadTrans, lift)
85−import Data.Default (Default(..))
87−import qualified Data.Map as Map
88−import Data.Maybe (fromMaybe)
89−import Data.Monoid hiding (First(..))
91−import Data.Semigroup (First(..))
92import Data.Set (Set)
17import Data.Set (Set)
93import qualified Data.Set as Set
18import qualified Data.Set as Set
94−import Data.Text (Text)
95−import qualified Data.Text as T
96−import qualified Data.Text.Zipper as TZ
97import Graphics.Vty (Image)
19import Graphics.Vty (Image)
98import qualified Graphics.Vty as V
20import qualified Graphics.Vty as V
99import Reflex
21import Reflex
100−import Reflex.Host.Class (MonadReflexCreateTrigger)
101import Reflex.Class ()
22import Reflex.Class ()
102−
23+import Reflex.Host.Class (MonadReflexCreateTrigger)
103import Reflex.Vty.Host
24import Reflex.Vty.Host
105−import Control.Monad.NodeId
26+-- * Running a vty application
107−-- | The context within which a 'VtyWidget' runs
108−data VtyWidgetCtx t = VtyWidgetCtx
109− { _vtyWidgetCtx_width :: Dynamic t Int
110− -- ^ The width of the region allocated to the widget.
111− , _vtyWidgetCtx_height :: Dynamic t Int
112− -- ^ The height of the region allocated to the widget.
113− , _vtyWidgetCtx_focus :: Dynamic t Bool
114− -- ^ Whether the widget should behave as if it has focus for keyboard input.
115− , _vtyWidgetCtx_input :: Event t VtyEvent
116− -- ^ User input events that the widget's parent chooses to share. These will generally
117− -- be filtered for relevance:
118− -- * Keyboard inputs are restricted to focused widgets
119− -- * Mouse inputs are restricted to the region in which the widget resides and are
120− -- translated into its internal coordinates.
123−-- | The output of a 'VtyWidget'
124−data VtyWidgetOut t = VtyWidgetOut
125− { _vtyWidgetOut_shutdown :: Event t ()
128−instance (Adjustable t m, MonadHold t m, Reflex t) => Adjustable t (VtyWidget t m) where
129− runWithReplace a0 a' = VtyWidget $ runWithReplace (unVtyWidget a0) $ fmap unVtyWidget a'
130− traverseIntMapWithKeyWithAdjust f dm0 dm' = VtyWidget $
131− traverseIntMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
132− traverseDMapWithKeyWithAdjust f dm0 dm' = VtyWidget $ do
133− traverseDMapWithKeyWithAdjust (\k v -> unVtyWidget (f k v)) dm0 dm'
134− traverseDMapWithKeyWithAdjustWithMove f dm0 dm' = VtyWidget $ do
135− traverseDMapWithKeyWithAdjustWithMove (\k v -> unVtyWidget (f k v)) dm0 dm'
137−-- | A widget that can read its context and produce image output
138−newtype VtyWidget t m a = VtyWidget
139− { unVtyWidget :: BehaviorWriterT t [Image] (ReaderT (VtyWidgetCtx t) m) a
151− , MonadReflexCreateTrigger t
155−deriving instance PerformEvent t m => PerformEvent t (VtyWidget t m)
156−instance MonadTrans (VtyWidget t) where
157− lift f = VtyWidget $ lift $ lift f
159−instance MonadNodeId m => MonadNodeId (VtyWidget t m) where
160− getNextNodeId = VtyWidget $ do
161− lift $ lift $ getNextNodeId
163−-- | Runs a 'VtyWidget' with a given context
165− :: (Reflex t, MonadNodeId m)
168− -> m (a, Behavior t [Image])
169−runVtyWidget ctx w = runReaderT (runBehaviorWriterT (unVtyWidget w)) ctx
171−-- | 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
172mainWidgetWithHandle
29mainWidgetWithHandle
174− -> (forall t m. (MonadVtyApp t m, MonadNodeId m) => VtyWidget t m (Event t ()))
32+ ( MonadVtyApp t m
35+ , HasDisplayRegion t m
176mainWidgetWithHandle vty child =
41mainWidgetWithHandle vty child =
177 runVtyAppWithHandle vty $ \dr0 inp -> do
42 runVtyAppWithHandle vty $ \dr0 inp -> do
@@ -181,71 +46,178 @@ mainWidgetWithHandle vty child =
181 let inp' = fforMaybe inp $ \case
46 let inp' = fforMaybe inp $ \case
182 V.EvResize {} -> Nothing
47 V.EvResize {} -> Nothing
183 x -> Just x
48 x -> Just x
184− let ctx = VtyWidgetCtx
49+ (shutdown, images) <- runThemeReader (constant V.defAttr) $
185− { _vtyWidgetCtx_width = fmap fst size
50+ runFocusReader (pure True) $
186− , _vtyWidgetCtx_height = fmap snd size
51+ runDisplayRegion (fmap (\(w, h) -> Region 0 0 w h) size) $
187− , _vtyWidgetCtx_input = inp'
52+ runImageWriter $
188− , _vtyWidgetCtx_focus = constDyn True
53+ runNodeIdT $
189− }
54+ runInput inp' $ do
190− (shutdown, images) <- runNodeIdT $ runVtyWidget ctx $ do
191− tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
55+ tellImages . ffor (current size) $ \(w, h) -> [V.charFill V.defAttr ' ' w h]
193 return $ VtyResult
57 return $ VtyResult
194 { _vtyResult_picture = fmap (V.picForLayers . reverse) images
58 { _vtyResult_picture = fmap (V.picForLayers . reverse) images
195 , _vtyResult_shutdown = shutdown
59 , _vtyResult_shutdown = shutdown
62+-- | The output of a vty widget
63+data VtyWidgetOut t = VtyWidgetOut
64+ { _vtyWidgetOut_shutdown :: Event t ()
198-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
67-- | Like 'mainWidgetWithHandle', but uses a default vty configuration
199mainWidget
68mainWidget
200− :: (forall t m. (MonadVtyApp t m, MonadNodeId m) => VtyWidget t m (Event t ()))
70+ ( MonadVtyApp t m
73+ , HasDisplayRegion t m
202mainWidget child = do
79mainWidget child = do
203 vty <- getDefaultVty
80 vty <- getDefaultVty
204 mainWidgetWithHandle vty child
81 mainWidgetWithHandle vty child
206−-- | A class for things that know their own display size dimensions
83+-- * Input Events
207−class (Reflex t, Monad m) => HasDisplaySize t m | m -> t where
208− -- | Retrieve the display width (columns)
209− displayWidth :: m (Dynamic t Int)
210− default displayWidth :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
211− displayWidth = lift displayWidth
212− -- | Retrieve the display height (rows)
213− displayHeight :: m (Dynamic t Int)
214− default displayHeight :: (f m' ~ m, MonadTrans f, HasDisplaySize t m') => m (Dynamic t Int)
215− displayHeight = lift displayHeight
217−instance (Reflex t, Monad m) => HasDisplaySize t (VtyWidget t m) where
218− displayWidth = VtyWidget . lift $ asks _vtyWidgetCtx_width
219− displayHeight = VtyWidget . lift $ asks _vtyWidgetCtx_height
221−instance HasDisplaySize t m => HasDisplaySize t (ReaderT x m)
222−instance HasDisplaySize t m => HasDisplaySize t (BehaviorWriterT t x m)
223−instance HasDisplaySize t m => HasDisplaySize t (DynamicWriterT t x m)
224−instance HasDisplaySize t m => HasDisplaySize t (EventWriterT t x m)
226−instance HasDisplaySize t m => HasDisplaySize t (NodeIdT m)
228-- | A class for things that can receive vty events as input
85-- | A class for things that can receive vty events as input
229−class HasVtyInput t m | m -> t where
86+class HasInput t m | m -> t where
230 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
232−instance (Reflex t, Monad m) => HasVtyInput t (VtyWidget t m) where
114+instance (Adjustable t m, MonadHold t m, Reflex t) => Adjustable t (Input t m) where
233− input = VtyWidget . lift $ asks _vtyWidgetCtx_input
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
235−-- | A class for things that can dynamically gain and lose focus
150+-- | Type synonym for a key and modifier combination
236−class HasFocus t m | m -> t where
151+type KeyCombo = (V.Key, [V.Modifier])
237− focus :: m (Dynamic t Bool)
239−instance (Reflex t, Monad m) => HasFocus t (VtyWidget t m) where
153+-- | Emits an event that fires on a particular key press (without modifiers)
240− focus = VtyWidget . lift $ asks _vtyWidgetCtx_focus
154+key :: (Monad m, Reflex t, HasInput t m) => V.Key -> m (Event t KeyCombo)
155+key = keyCombos . Set.singleton . (,[])
242−-- | A class for widgets that can produce images to draw to the display
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
243−class (Reflex t, Monad m) => ImageWriter t m | m -> t where
163+ :: (Reflex t, Monad m, HasInput t m)
244− -- | Send images upstream for rendering
164+ => KeyCombo
245− tellImages :: Behavior t [Image] -> m ()
165+ -> m (Event t KeyCombo)
166+keyCombo = keyCombos . Set.singleton
247−instance (Monad m, Reflex t) => ImageWriter t (BehaviorWriterT t [Image] m) where
168+-- | Emit an event that fires whenever any of the provided key combinations occur
248− tellImages = tellBehavior
169+keyCombos
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
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)
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.
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
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
220+-- * Getting and setting the display region
250-- | A chunk of the display area
222-- | A chunk of the display area
251data Region = Region
223data Region = Region
@@ -256,614 +228,334 @@ data Region = Region
257 deriving (Show, Read, Eq, Ord)
229 deriving (Show, Read, Eq, Ord)
259−-- | A dynamic chunk of the display area
231+-- | A region that occupies no space.
260−data DynRegion t = DynRegion
232+nilRegion :: Region
261− { _dynRegion_left :: Dynamic t Int
233+nilRegion = Region 0 0 0 0
262− , _dynRegion_top :: Dynamic t Int
263− , _dynRegion_width :: Dynamic t Int
264− , _dynRegion_height :: Dynamic t Int
267-- | The width and height of a 'Region'
235-- | The width and height of a 'Region'
268regionSize :: Region -> (Int, Int)
236regionSize :: Region -> (Int, Int)
269regionSize (Region _ _ w h) = (w, h)
237regionSize (Region _ _ w h) = (w, h)
271-- | Produces an 'Image' that fills a region with space characters
239-- | Produces an 'Image' that fills a region with space characters
272−regionBlankImage :: Region -> Image
240+regionBlankImage :: V.Attr -> Region -> Image
273−regionBlankImage r@(Region _ _ width height) =
241+regionBlankImage attr r@(Region _ _ width height) =
274− withinImage r $ V.charFill V.defAttr ' ' width height
242+ withinImage r $ V.charFill attr ' ' width height
276−-- | A behavior of the current display area represented by a 'DynRegion'
244+-- | A class for things that know their own display size dimensions
277−currentRegion :: Reflex t => DynRegion t -> Behavior t Region
245+class (Reflex t, Monad m) => HasDisplayRegion t m | m -> t where
278−currentRegion (DynRegion l t w h) = Region <$> current l <*> current t <*> current w <*> current h
246+ -- | Retrieve the display region
247+ askRegion :: m (Dynamic t Region)
248+ default askRegion :: (f m' ~ m, MonadTrans f, HasDisplayRegion t m') => m (Dynamic t Region)
249+ askRegion = lift askRegion
250+ -- | Run an action in a local region, by applying a transformation to the region
251+ localRegion :: (Dynamic t Region -> Dynamic t Region) -> m a -> m a
252+ default localRegion :: (f m' ~ m, Monad m', MFunctor f, HasDisplayRegion t m') => (Dynamic t Region -> Dynamic t Region) -> m a -> m a
253+ localRegion f = hoist (localRegion f)
255+-- | Retrieve the display width
256+displayWidth :: HasDisplayRegion t m => m (Dynamic t Int)
257+displayWidth = fmap _region_width <$> askRegion
259+-- | Retrieve the display height
260+displayHeight :: HasDisplayRegion t m => m (Dynamic t Int)
261+displayHeight = fmap _region_height <$> askRegion
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)
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 }
280−-- | Translates and crops an 'Image' so that it is contained by
283+instance (Monad m, Reflex t) => HasDisplayRegion t (DisplayRegion t m) where
281−-- the given 'Region'.
284+ askRegion = DisplayRegion ask
282−withinImage
285+ localRegion f = DisplayRegion . local f . unDisplayRegion
286−withinImage (Region left top width height)
287− | width < 0 || height < 0 = withinImage (Region left top 0 0)
288− | otherwise = V.translate left top . V.crop width height
290−-- | Low-level widget combinator that runs a child 'VtyWidget' within
287+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (DisplayRegion t m)
291−-- a given region and context. This widget filters and modifies the input
288+deriving instance NotReady t m => NotReady t (DisplayRegion t m)
292−-- that the child widget receives such that:
289+deriving instance PerformEvent t m => PerformEvent t (DisplayRegion t m)
293−-- * unfocused widgets receive no key events
290+deriving instance PostBuild t m => PostBuild t (DisplayRegion t m)
294−-- * mouse inputs outside the region are ignored
291+deriving instance TriggerEvent t m => TriggerEvent t (DisplayRegion t m)
295−-- * mouse inputs inside the region have their coordinates translated such
292+instance HasImageWriter t m => HasImageWriter t (DisplayRegion t m)
296−-- that (0,0) is the top-left corner of the region
293+instance HasFocusReader t m => HasFocusReader t (DisplayRegion t m)
298− :: (Reflex t, Monad m, MonadNodeId m)
300− -> Dynamic t Bool -- ^ Whether the widget should be focused when the parent is.
303−pane dr foc child = VtyWidget $ do
305− let reg = currentRegion dr
306− let ctx' = VtyWidgetCtx
307− { _vtyWidgetCtx_input = leftmost -- TODO: think about this leftmost more.
309− attachWith (\(r,f) e -> filterInput r f e)
310− (liftA2 (,) reg (current foc))
311− (_vtyWidgetCtx_input ctx)
313− , _vtyWidgetCtx_focus = liftA2 (&&) (_vtyWidgetCtx_focus ctx) foc
314− , _vtyWidgetCtx_width = _dynRegion_width dr
315− , _vtyWidgetCtx_height = _dynRegion_height dr
317− (result, images) <- lift . lift $ runVtyWidget ctx' child
318− let images' = liftA2 (\r is -> map (withinImage r) is) reg images
322− filterInput :: Region -> Bool -> VtyEvent -> Maybe VtyEvent
323− filterInput (Region l t w h) focused e = case e of
324− V.EvKey _ _ | not focused -> Nothing
325− V.EvMouseDown x y btn m -> mouse (\u v -> V.EvMouseDown u v btn m) x y
326− V.EvMouseUp x y btn -> mouse (\u v -> V.EvMouseUp u v btn) x y
333− , y >= t + h ] = Nothing
335− Just (con (x - l) (y - t))
337−-- | Information about a drag operation
339− { _drag_from :: (Int, Int) -- ^ Where the drag began
340− , _drag_to :: (Int, Int) -- ^ Where the mouse currently is
341− , _drag_button :: V.Button -- ^ Which mouse button is dragging
342− , _drag_modifiers :: [V.Modifier] -- ^ What modifiers are held
343− , _drag_end :: Bool -- ^ Whether the drag ended (the mouse button was released)
345− deriving (Eq, Ord, Show)
347−-- | Converts raw vty mouse drag events into an event stream of 'Drag's
349− :: (Reflex t, MonadFix m, MonadHold t m)
351− -> VtyWidget t m (Event t Drag)
354− let f :: Maybe Drag -> V.Event -> Maybe Drag
356− V.EvMouseDown x y btn' mods
357− | btn == btn' -> Just $ Drag (x,y) (x,y) btn' mods False
358− | otherwise -> Nothing
360− f (Just (Drag from _ _ mods end)) = \case
361− V.EvMouseDown x y btn' mods'
362− | end -> Just $ Drag (x,y) (x,y) btn' mods' False
363− | btn == btn' -> Just $ Drag from (x,y) btn mods' False
364− | otherwise -> Nothing -- Ignore other buttons.
365− V.EvMouseUp x y (Just btn')
367− | btn == btn' -> Just $ Drag from (x,y) btn mods True
368− | otherwise -> Nothing
369− V.EvMouseUp x y Nothing -- Terminal doesn't specify mouse up button,
370− -- assume it's the right one.
372− | otherwise -> Just $ Drag from (x,y) btn mods True
374− rec let newDrag = attachWithMaybe f (current dragD) inp
375− dragD <- holdDyn Nothing $ Just <$> newDrag
376− return (fmapMaybe id $ updated dragD)
378−-- | Mouse down events for a particular mouse button
380− :: (Reflex t, Monad m)
382− -> VtyWidget t m (Event t MouseDown)
385− return $ fforMaybe i $ \case
386− V.EvMouseDown x y btn' mods -> if btn == btn'
387− then Just $ MouseDown btn' (x, y) mods
391−-- | Mouse up events for a particular mouse button
295+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (DisplayRegion t m) where
392−mouseUp
296+ runWithReplace (DisplayRegion a) e = DisplayRegion $ runWithReplace a $ fmap unDisplayRegion e
393− :: (Reflex t, Monad m)
297+ traverseIntMapWithKeyWithAdjust f m e = DisplayRegion $ traverseIntMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
394− => VtyWidget t m (Event t MouseUp)
298+ traverseDMapWithKeyWithAdjust f m e = DisplayRegion $ traverseDMapWithKeyWithAdjust (\k v -> unDisplayRegion $ f k v) m e
395−mouseUp = do
299+ traverseDMapWithKeyWithAdjustWithMove f m e = DisplayRegion $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unDisplayRegion $ f k v) m e
397− return $ fforMaybe i $ \case
398− V.EvMouseUp x y btn' -> Just $ MouseUp btn' (x, y)
401−-- | Information about a mouse down event
301+instance MonadTrans (DisplayRegion t) where
402−data MouseDown = MouseDown
302+ lift = DisplayRegion . lift
403− { _mouseDown_button :: V.Button
404− , _mouseDown_coordinates :: (Int, Int)
405− , _mouseDown_modifiers :: [V.Modifier]
407− deriving (Eq, Ord, Show)
409−-- | Information about a mouse up event
304+instance MFunctor (DisplayRegion t) where
410−data MouseUp = MouseUp
305+ hoist f = DisplayRegion . hoist f . unDisplayRegion
411− { _mouseUp_button :: Maybe V.Button
412− , _mouseUp_coordinates :: (Int, Int)
414− deriving (Eq, Ord, Show)
416−-- | Type synonym for a key and modifier combination
307+instance MonadNodeId m => MonadNodeId (DisplayRegion t m)
417−type KeyCombo = (V.Key, [V.Modifier])
419−-- | Emits an event that fires on a particular key press (without modifiers)
309+-- | Run a 'DisplayRegion' action with a given 'Region'
420−key :: (Monad m, Reflex t) => V.Key -> VtyWidget t m (Event t KeyCombo)
310+runDisplayRegion
421−key = keyCombos . Set.singleton . (,[])
311+ :: (Reflex t, Monad m)
313+ -> DisplayRegion t m a
315+runDisplayRegion r = flip runReaderT r . unDisplayRegion
423−-- | Emits an event that fires on particular key presses (without modifiers)
317+-- * Getting focus state
424−keys :: (Monad m, Reflex t) => [V.Key] -> VtyWidget t m (Event t KeyCombo)
425−keys = keyCombos . Set.fromList . fmap (,[])
427−-- | Emit an event that fires whenever any of the provided key combinations occur
319+-- | A class for things that can dynamically gain and lose focus
429− :: (Reflex t, Monad m)
320+class (Reflex t, Monad m) => HasFocusReader t m | m -> t where
430− => Set KeyCombo
321+ focus :: m (Dynamic t Bool)
431− -> VtyWidget t m (Event t KeyCombo)
322+ default focus :: (f m' ~ m, Monad m', MonadTrans f, HasFocusReader t m') => m (Dynamic t Bool)
432−keyCombos ks = do
323+ focus = lift focus
433− i <- input
324+ localFocus :: (Dynamic t Bool -> Dynamic t Bool) -> m a -> m a
434− return $ fforMaybe i $ \case
325+ default localFocus :: (f m' ~ m, Monad m', MFunctor f, HasFocusReader t m') => (Dynamic t Bool -> Dynamic t Bool) -> m a -> m a
435− V.EvKey k m -> if Set.member (k, m) ks
326+ localFocus f = hoist (localFocus f)
436− then Just (k, m)
327+
437− else Nothing
328+instance HasFocusReader t m => HasFocusReader t (ReaderT x m)
438− _ -> Nothing
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 }
440−-- | A plain split of the available space into vertically stacked panes.
348+instance (Monad m, Reflex t) => HasFocusReader t (FocusReader t m) where
441−-- No visual separator is built in here.
349+ focus = FocusReader ask
442−splitV :: (Reflex t, Monad m, MonadNodeId m)
350+ localFocus f = FocusReader . local f . unFocusReader
443− => Dynamic t (Int -> Int)
444− -- ^ Function used to determine size of first pane based on available size
445− -> Dynamic t (Bool, Bool)
446− -- ^ How to focus the two sub-panes, given that we are focused.
448− -- ^ Widget for first pane
450− -- ^ Widget for second pane
451− -> VtyWidget t m (a,b)
452−splitV sizeFunD focD wA wB = do
455− let regA = DynRegion
456− { _dynRegion_left = pure 0
457− , _dynRegion_top = pure 0
458− , _dynRegion_width = dw
459− , _dynRegion_height = sizeFunD <*> dh
462− { _dynRegion_left = pure 0
463− , _dynRegion_top = _dynRegion_height regA
464− , _dynRegion_width = dw
465− , _dynRegion_height = liftA2 (-) dh (_dynRegion_height regA)
467− ra <- pane regA (fst <$> focD) wA
468− rb <- pane regB (snd <$> focD) wB
471−-- | A split of the available space into two parts with a draggable separator.
472−-- Starts with half the space allocated to each, and the first pane has focus.
473−-- Clicking in a pane switches focus.
474−splitVDrag :: (Reflex t, MonadFix m, MonadHold t m, MonadNodeId m)
478− -> VtyWidget t m (a,b)
479−splitVDrag wS wA wB = do
482− h0 <- sample $ current dh -- TODO
483− dragE <- drag V.BLeft
484− let splitter0 = h0 `div` 2
485− rec splitterCheckpoint <- holdDyn splitter0 $ leftmost [fst <$> ffilter snd dragSplitter, resizeSplitter]
486− splitterPos <- holdDyn splitter0 $ leftmost [fst <$> dragSplitter, resizeSplitter]
487− splitterFrac <- holdDyn ((1::Double) / 2) $ ffor (attach (current dh) (fst <$> dragSplitter)) $ \(h, x) ->
488− fromIntegral x / (max 1 (fromIntegral h))
489− let dragSplitter = fforMaybe (attach (current splitterCheckpoint) dragE) $
490− \(splitterY, Drag (_, fromY) (_, toY) _ _ end) ->
491− if splitterY == fromY then Just (toY, end) else Nothing
492− regA = DynRegion 0 0 dw splitterPos
493− regS = DynRegion 0 splitterPos dw 1
494− regB = DynRegion 0 (splitterPos + 1) dw (dh - splitterPos - 1)
495− resizeSplitter = ffor (attach (current splitterFrac) (updated dh)) $
496− \(frac, h) -> round (frac * fromIntegral h)
497− focA <- holdDyn True $ leftmost
501− (mA, rA) <- pane regA focA $ withMouseDown wA
502− pane regS (pure False) wS
503− (mB, rB) <- pane regB (not <$> focA) $ withMouseDown wB
506− withMouseDown x = do
507− m <- mouseDown V.BLeft
511−-- | Fill the background with a particular character.
512−fill :: (Reflex t, Monad m) => Char -> VtyWidget t m ()
516− let fillImg = current $ liftA2 (\w h -> [V.charFill V.defAttr c w h]) dw dh
519−-- | Fill the background with the bottom
520−hRule :: (Reflex t, Monad m) => BoxStyle -> VtyWidget t m ()
521−hRule boxStyle = fill (_boxStyle_s boxStyle)
523−-- | Defines a set of symbols to use to draw the outlines of boxes
524−-- C.f. https://en.wikipedia.org/wiki/Box-drawing_character
525−data BoxStyle = BoxStyle
526− { _boxStyle_nw :: Char
527− , _boxStyle_n :: Char
528− , _boxStyle_ne :: Char
529− , _boxStyle_e :: Char
530− , _boxStyle_se :: Char
531− , _boxStyle_s :: Char
532− , _boxStyle_sw :: Char
533− , _boxStyle_w :: Char
536−instance Default BoxStyle where
352+deriving instance MonadReflexCreateTrigger t m => MonadReflexCreateTrigger t (FocusReader t m)
537− def = singleBoxStyle
353+deriving instance NotReady t m => NotReady t (FocusReader t m)
538−
354+deriving instance PerformEvent t m => PerformEvent t (FocusReader t m)
539−-- | A box style that uses hyphens and pipe characters. Doesn't handle
355+deriving instance PostBuild t m => PostBuild t (FocusReader t m)
540−-- corners very well.
356+deriving instance TriggerEvent t m => TriggerEvent t (FocusReader t m)
541−hyphenBoxStyle :: BoxStyle
357+instance HasImageWriter t m => HasImageWriter t (FocusReader t m)
542−hyphenBoxStyle = BoxStyle '-' '-' '-' '|' '-' '-' '-' '|'
544−-- | A single line box style
545−singleBoxStyle :: BoxStyle
546−singleBoxStyle = BoxStyle '┌' '─' '┐' '│' '┘' '─' '└' '│'
548−-- | A thick single line box style
549−thickBoxStyle :: BoxStyle
550−thickBoxStyle = BoxStyle '┏' '━' '┓' '┃' '┛' '━' '┗' '┃'
552−-- | A double line box style
553−doubleBoxStyle :: BoxStyle
554−doubleBoxStyle = BoxStyle '╔' '═' '╗' '║' '╝' '═' '╚' '║'
556−-- | A single line box style with rounded corners
557−roundedBoxStyle :: BoxStyle
558−roundedBoxStyle = BoxStyle '╭' '─' '╮' '│' '╯' '─' '╰' '│'
560−-- | Draws a box in the provided style and a child widget inside of that box
561−box :: (Monad m, Reflex t, MonadNodeId m)
562− => Behavior t BoxStyle
565−box boxStyle child = do
568− let boxReg = DynRegion (pure 0) (pure 0) dw dh
569− innerReg = DynRegion (pure 1) (pure 1) (subtract 2 <$> dw) (subtract 2 <$> dh)
570− tellImages (boxImages <$> boxStyle <*> currentRegion boxReg)
571− tellImages (fmap (\r -> [regionBlankImage r]) (currentRegion innerReg))
572− pane innerReg (pure True) child
574− boxImages :: BoxStyle -> Region -> [Image]
575− boxImages style (Region left top width height) =
576− let right = left + width - 1
577− bottom = top + height - 1
579− [ withinImage (Region (left + 1) top (width - 2) 1) $
580− V.charFill V.defAttr (_boxStyle_n style) (width - 2) 1
581− , withinImage (Region right (top + 1) 1 (height - 2)) $
582− V.charFill V.defAttr (_boxStyle_e style) 1 (height - 2)
583− , withinImage (Region (left + 1) bottom (width - 2) 1) $
584− V.charFill V.defAttr (_boxStyle_s style) (width - 2) 1
585− , withinImage (Region left (top + 1) 1 (height - 2)) $
586− V.charFill V.defAttr (_boxStyle_w style) 1 (height - 2)
589− [ withinImage (Region left top 1 1) $
590− V.char V.defAttr (_boxStyle_nw style)
591− , withinImage (Region right top 1 1) $
592− V.char V.defAttr (_boxStyle_ne style)
593− , withinImage (Region right bottom 1 1) $
594− V.char V.defAttr (_boxStyle_se style)
595− , withinImage (Region left bottom 1 1) $
596− V.char V.defAttr (_boxStyle_sw style)
598− in sides ++ if width > 1 && height > 1 then corners else []
600−-- | A box whose style is static
602− :: (Reflex t, Monad m, MonadNodeId m)
606−boxStatic = box . pure
608−-- | Configuration options for displaying "rich" text
609−data RichTextConfig t = RichTextConfig
610− { _richTextConfig_attributes :: Behavior t V.Attr
613−instance Reflex t => Default (RichTextConfig t) where
359+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (FocusReader t m) where
614− def = RichTextConfig $ pure V.defAttr
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
616−-- | A widget that displays text with custom time-varying attributes
365+instance MonadTrans (FocusReader t) where
617−richText
366+ lift = FocusReader . lift
618− :: (Reflex t, Monad m)
367+
619− => RichTextConfig t
368+instance MFunctor (FocusReader t) where
620− -> Behavior t Text
369+ hoist f = FocusReader . hoist f . unFocusReader
621− -> VtyWidget t m ()
370+
622−richText cfg t = do
371+instance MonadNodeId m => MonadNodeId (FocusReader t m)
624− let img = (\w a s -> [wrapText w a s])
626− <*> _richTextConfig_attributes cfg
630− wrapText maxWidth attrs = V.vertCat
631− . concatMap (fmap (V.string attrs . T.unpack) . TZ.wrapWithOffset maxWidth 0)
634−-- | Renders text, wrapped to the container width
373+-- | Run a 'FocusReader' action with the given focus value
635−text
374+runFocusReader
636 :: (Reflex t, Monad m)
375 :: (Reflex t, Monad m)
637− => Behavior t Text
376+ => Dynamic t Bool
638− -> VtyWidget t m ()
377+ -> FocusReader t m a
639−text = richText def
378+ -> m a
640−
379+runFocusReader b = flip runReaderT b . unFocusReader
641−-- | Renders any behavior whose value can be converted to
644− :: (Reflex t, Monad m, Show a)
647−display a = text $ T.pack . show <$> a
649−data Constraint = Constraint_Fixed Int
650− | Constraint_Min Int
651− deriving (Show, Read, Eq, Ord)
653−-- | Compute the size of each widget "@k@" based on the total set of 'Constraint's
381+-- * "Image" output
657− -> Map k (a, Constraint)
659−computeSizes available constraints =
660− let minTotal = sum $ ffor (Map.elems constraints) $ \case
661− (_, Constraint_Fixed n) -> n
662− (_, Constraint_Min n) -> n
663− leftover = max 0 (available - minTotal)
664− numStretch = Map.size $ Map.filter (isMin . snd) constraints
665− szStretch = floor $ leftover % (max numStretch 1)
666− adjustment = max 0 $ available - minTotal - szStretch * numStretch
667− in snd $ Map.mapAccum (\adj (a, c) -> case c of
668− Constraint_Fixed n -> (adj, (a, n))
669− Constraint_Min n -> (0, (a, n + szStretch + adj))) adjustment constraints
671− isMin (Constraint_Min _) = True
674−computeEdges :: (Ord k) => Map k (a, Int) -> Map k (a, (Int, Int))
383+-- | A class for widgets that can produce images to draw to the display
675−computeEdges = fst . Map.foldlWithKey' (\(m, offset) k (a, sz) ->
384+class (Reflex t, Monad m) => HasImageWriter t m | m -> t where
676− (Map.insert k (a, (offset, sz)) m, sz + offset)) (Map.empty, 0)
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
678−blank :: Monad m => VtyWidget t m ()
413+instance MonadTrans (ImageWriter t) where
679−blank = return ()
414+ lift = ImageWriter . lift
681−-- | The main-axis orientation of a 'StackWidget' widget
416+instance MFunctor (ImageWriter t) where
682−data Orientation = Orientation_Column
417+ hoist f = ImageWriter . (hoist f) . unImageWriter
684− deriving (Show, Read, Eq, Ord)
686−data LayoutSegment = LayoutSegment
419+instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (ImageWriter t m) where
687− { _layoutSegment_offset :: Int
420+ runWithReplace (ImageWriter a) e = ImageWriter $ runWithReplace a $ fmap unImageWriter e
688− , _layoutSegment_size :: Int
421+ traverseIntMapWithKeyWithAdjust f m e = ImageWriter $ traverseIntMapWithKeyWithAdjust (\k v -> unImageWriter $ f k v) m e
689− }
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
691−data LayoutCtx t = LayoutCtx
425+instance HasImageWriter t m => HasImageWriter t (ReaderT x m)
692− { _layoutCtx_regions :: Dynamic t (Map NodeId LayoutSegment)
426+instance HasImageWriter t m => HasImageWriter t (BehaviorWriterT t x m)
693− , _layoutCtx_focusDemux :: Demux t (Maybe NodeId)
427+instance HasImageWriter t m => HasImageWriter t (DynamicWriterT t x m)
694− , _layoutCtx_orientation :: Dynamic t Orientation
428+instance HasImageWriter t m => HasImageWriter t (EventWriterT t x m)
695− }
429+instance HasImageWriter t m => HasImageWriter t (NodeIdT m)
697−newtype Layout t m a = Layout
431+instance (Monad m, Reflex t) => HasImageWriter t (ImageWriter t m) where
698− { unLayout :: EventWriterT t (First NodeId)
432+ tellImages = ImageWriter . tellBehavior
699− (DynamicWriterT t (Endo [(NodeId, (Bool, Constraint))])
433+ mapImages f (ImageWriter x) = ImageWriter $ do
700− (ReaderT (LayoutCtx t)
434+ (a, images) <- lift $ runBehaviorWriterT x
701− (VtyWidget t m))) a
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 }
702− } deriving
472+ deriving
703 ( Functor
473 ( Functor
704 , Applicative
474 , Applicative
706 , MonadHold t
477 , MonadHold t
707 , MonadSample t
480 , MonadSample t
712− , MonadReflexCreateTrigger t
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
717−instance MonadTrans (Layout t) where
500+instance MonadTrans (ThemeReader t) where
718− lift x = Layout $ lift $ lift $ lift $ lift x
501+ lift = ThemeReader . lift
720−instance (Adjustable t m, MonadFix m, MonadHold t m) => Adjustable t (Layout t m) where
503+instance MFunctor (ThemeReader t) where
721− runWithReplace (Layout a) e = Layout $ runWithReplace a $ fmap unLayout e
504+ hoist f = ThemeReader . hoist f . unThemeReader
722− traverseIntMapWithKeyWithAdjust f m e = Layout $ traverseIntMapWithKeyWithAdjust (\k v -> unLayout $ f k v) m e
505+
723− traverseDMapWithKeyWithAdjust f m e = Layout $ traverseDMapWithKeyWithAdjust (\k v -> unLayout $ f k v) m e
506+instance MonadNodeId m => MonadNodeId (ThemeReader t m)
724− traverseDMapWithKeyWithAdjustWithMove f m e = Layout $ traverseDMapWithKeyWithAdjustWithMove (\k v -> unLayout $ f k v) m e
727− :: (MonadFix m, MonadHold t m, PostBuild t m, Monad m, MonadNodeId m)
728− => Dynamic t Orientation
733−runLayout ddir focus0 focusShift (Layout child) = do
736− let main = ffor3 ddir dw dh $ \d w h -> case d of
737− Orientation_Column -> h
738− Orientation_Row -> w
740− rec ((a, focusReq), queriesEndo) <- runReaderT (runDynamicWriterT $ runEventWriterT child) $ LayoutCtx solutionMap focusDemux ddir
741− let queries = flip appEndo [] <$> queriesEndo
742− solution = ffor2 main queries $ \sz qs -> Map.fromList
748− . zip [0::Integer ..]
750− solutionMap = ffor solution $ \ss -> ffor ss $ \(offset, sz) -> LayoutSegment
751− { _layoutSegment_offset = offset
752− , _layoutSegment_size = sz
754− focusable = fmap (Bimap.fromList . zip [0..]) $
755− ffor queries $ \qs -> fforMaybe qs $ \(nodeId, (f, _)) ->
756− if f then Just nodeId else Nothing
758− :: (Bimap Int NodeId, (Int, Maybe NodeId))
759− -> Either Int NodeId
760− -> (Int, Maybe NodeId)
761− adjustFocus (fm, (cur, _)) (Left shift) =
762− let ix = (cur + shift) `mod` (max 1 $ Bimap.size fm)
763− in (ix, Bimap.lookup ix fm)
764− adjustFocus (fm, (cur, _)) (Right goto) =
765− let ix = fromMaybe cur $ Bimap.lookupR goto fm
767− focusChange = attachWith
769− (current $ (,) <$> focusable <*> focussed)
770− $ leftmost [Left <$> focusShift, Left 0 <$ pb, Right . getFirst <$> focusReq]
771− -- A pair (Int, Maybe NodeId) which represents the index
772− -- that we're trying to focus, and the node that actually gets
773− -- focused (at that index) if it exists
774− focussed <- holdDyn (focus0, Nothing) focusChange
775− let focusDemux = demux $ snd <$> focussed
779− :: (Reflex t, Monad m, MonadNodeId m)
780− => Dynamic t Constraint
782− -> VtyWidget t m (Event t x, a)
784−tile con focusable child = do
785− nodeId <- getNextNodeId
786− Layout $ tellDyn $ ffor2 con focusable $ \c f -> Endo ((nodeId, (f, c)):)
787− seg <- Layout $ asks $
788− fmap (Map.findWithDefault (LayoutSegment 0 0) nodeId) . _layoutCtx_regions
792− let cross = join $ ffor o $ \case
793− Orientation_Column -> dw
794− Orientation_Row -> dh
796− { _dynRegion_top = ffor2 seg o $ \s -> \case
797− Orientation_Column -> _layoutSegment_offset s
798− Orientation_Row -> 0
799− , _dynRegion_left = ffor2 seg o $ \s -> \case
800− Orientation_Column -> 0
801− Orientation_Row -> _layoutSegment_offset s
802− , _dynRegion_width = ffor3 seg cross o $ \s c -> \case
803− Orientation_Column -> c
804− Orientation_Row -> _layoutSegment_size s
805− , _dynRegion_height = ffor3 seg cross o $ \s c -> \case
806− Orientation_Column -> _layoutSegment_size s
807− Orientation_Row -> c
809− focussed <- Layout $ asks _layoutCtx_focusDemux
810− (focusReq, a) <- Layout $ lift $ lift $ lift $
811− pane reg (demuxed focussed $ Just nodeId) $ child
812− Layout $ tellEvent $ First nodeId <$ focusReq
815−data TileConfig t = TileConfig
816− { _tileConfig_constraint :: Dynamic t Constraint
817− , _tileConfig_focusable :: Dynamic t Bool
818− , _tileConfig_clickable :: Behavior t Bool
821−instance Reflex t => Default (TileConfig t) where
508+-- | Run a 'ThemeReader' action with the given focus value
822− def = TileConfig (pure $ Constraint_Min 0) (pure True) (pure True)
509+runThemeReader
825− :: (Reflex t, Monad m, MonadNodeId m)
829−fixed sz = tile (Constraint_Fixed <$> sz) (pure True) . clickable
832− :: (Reflex t, Monad m, MonadNodeId m)
835−stretch = tile (Constraint_Min <$> 0) (pure True) . clickable
838− :: (MonadFix m, MonadHold t m, PostBuild t m, MonadNodeId m)
842− nav <- tabNavigation
843− runLayout (pure Orientation_Column) 0 nav child
846− :: (MonadFix m, MonadHold t m, PostBuild t m, MonadNodeId m)
850− nav <- tabNavigation
851− runLayout (pure Orientation_Column) 0 nav child
853−tabNavigation :: (Reflex t, Monad m) => VtyWidget t m (Event t Int)
855− fwd <- fmap (const 1) <$> key (V.KChar '\t')
856− back <- fmap (const (-1)) <$> key V.KBackTab
857− return $ leftmost [fwd, back]
860 :: (Reflex t, Monad m)
510 :: (Reflex t, Monad m)
861− => VtyWidget t m a
511+ => Behavior t V.Attr
862− -> VtyWidget t m (Event t (), a)
512+ -> ThemeReader t m a
863−clickable child = do
513+ -> m a
864− click <- mouseDown V.BLeft
514+runThemeReader b = flip runReaderT b . unThemeReader
517+-- ** Manipulating images
519+-- | Translates and crops an 'Image' so that it is contained by
520+-- the given 'Region'.
525+withinImage (Region left top width height)
526+ | width < 0 || height < 0 = withinImage (Region left top 0 0)
527+ | otherwise = V.translate left top . V.crop width height
529+-- | Crop a behavior of images to a behavior of regions. See 'withinImage'.
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 ()
866− return (() <$ click, a)
561+blank = return ()
868−askOrientation :: Monad m => Layout t m (Dynamic t Orientation)
869−askOrientation = Layout $ asks _layoutCtx_orientation