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module Chelleport where
import Chelleport.AppShell (Action (AppAction, SysQuit), DrawContext (ctxWindow), setupAppShell)
import Chelleport.Draw (colorLightGray, colorWhite, renderText)
import Chelleport.KeySequence (eventToKeycode, generateKeyCells, isValidKey, nextChars, toKeyChar)
import Control.Monad (forM_, unless, void)
import Data.IORef (modifyIORef', newIORef, readIORef)
import Data.List (isPrefixOf)
import Data.Text (splitOn)
import qualified Data.Text as Text
import qualified SDL
import Unsafe.Coerce (unsafeCoerce)
data State = State
{ stateCells :: [[[Char]]],
stateKeySequence :: [Char]
}
data AppAction = FilterSequence SDL.Keycode | SetupGrid
open :: IO ()
open = setupAppShell initialState update eventToAction render
padded :: Int -> a -> [a] -> [a]
padded 0 _ ls = ls
padded n x ls
| length ls > n = ls
| otherwise = padded (n - 1) x (ls ++ [x])
initialState :: DrawContext -> IO State
initialState _ctx = do
let cells = generateKeyCells (rows, columns) hintKeys
pure $ State {stateCells = cells, stateKeySequence = []}
where
rows = 16
columns = 16
hintKeys = "ABCDEFGIMNOPRSTUVWXYZ"
render :: State -> DrawContext -> IO ()
render state ctx = do
(SDL.V2 width height) <- SDL.get $ SDL.windowSize $ ctxWindow ctx
let rows = stateCells state
let wcell = width `div` unsafeCoerce (length $ head rows)
let hcell = height `div` unsafeCoerce (length rows)
forM_ (zip [0 ..] rows) $ \(rowIndex, row) -> do
forM_ (zip [0 ..] row) $ \(colIndex, cell) -> do
let w = colIndex * wcell
let h = rowIndex * hcell
let keySequence = stateKeySequence state
let (matched, remaining) =
if keySequence `isPrefixOf` cell
then splitAt (length keySequence) cell
else ("", cell)
widthRef <- newIORef 0
unless (null matched) $ do
let pos = w
(textWidth, _h) <- renderText ctx (SDL.V2 pos h) colorLightGray $ Text.pack matched
modifyIORef' widthRef (const textWidth)
unless (null remaining) $ do
prevTextWidth <- readIORef widthRef
let pos = w + prevTextWidth
void $ renderText ctx (SDL.V2 pos h) colorWhite $ Text.pack remaining
update :: State -> DrawContext -> AppAction -> IO State
update state _ctx SetupGrid = pure state
update state _ctx (FilterSequence key) =
case validChars >>= (\chars -> (,chars) <$> toKeyChar key) of
Just (keyChar, validChars')
| keyChar `elem` validChars' ->
pure state {stateKeySequence = stateKeySequence state ++ [keyChar]}
_ -> pure state
where
validChars = nextChars (stateKeySequence state) (stateCells state)
eventToAction :: State -> SDL.Event -> Maybe (Action AppAction)
eventToAction _state event =
case SDL.eventPayload event of
-- SDL.WindowShownEvent _ -> Just $ AppAction SetupGrid
SDL.QuitEvent -> Just SysQuit
SDL.KeyboardEvent ev
| isKeyPressWith ev SDL.KeycodeQ -> Just SysQuit
| isKeyPressWith ev SDL.KeycodeEscape -> Just SysQuit
| isKeyPress ev && isValidKey (eventToKeycode ev) ->
Just $ AppAction $ FilterSequence $ eventToKeycode ev
_ -> Nothing
isKeyPress :: SDL.KeyboardEventData -> Bool
isKeyPress keyboardEvent =
SDL.keyboardEventKeyMotion keyboardEvent == SDL.Pressed
isKeyPressWith :: SDL.KeyboardEventData -> SDL.Keycode -> Bool
isKeyPressWith keyboardEvent keyCode =
isKeyPress keyboardEvent && SDL.keysymKeycode (SDL.keyboardEventKeysym keyboardEvent) == keyCode
|
