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module Chelleport.View (render) where
import Chelleport.Draw
import Chelleport.Types
import Control.Monad (forM_, unless, void)
import Data.IORef (modifyIORef', newIORef, readIORef)
import Data.List (isPrefixOf)
import qualified Data.Text as Text
import Foreign.C (CInt)
import SDL (($=))
import qualified SDL
import Unsafe.Coerce (unsafeCoerce)
isEmpty :: [a] -> Bool
isEmpty = null
render :: State -> DrawContext -> IO ()
render state ctx = do
renderGridLines state ctx
(SDL.V2 width height) <- SDL.get $ SDL.windowSize $ ctxWindow ctx
let grid = stateCells state
let wcell = width `div` unsafeCoerce (length $ head grid)
let hcell = height `div` unsafeCoerce (length grid)
forM_ (zip [0 ..] grid) $ \(rowIndex, row) -> do
let py = rowIndex * hcell
forM_ (zip [0 ..] row) $ \(colIndex, cell) -> do
let px = colIndex * wcell
renderKeySequence ctx (stateKeySequence state) cell (px, py)
renderKeySequence :: DrawContext -> KeySequence -> Cell -> (CInt, CInt) -> IO ()
renderKeySequence ctx keySequence cell (px, py) = do
let (matched, remaining)
| keySequence `isPrefixOf` cell = splitAt (length keySequence) cell
| otherwise = ("", cell)
let textColor
| isEmpty keySequence = colorWhite
| not $ isEmpty matched = colorAccent
| otherwise = colorGray
widthRef <- newIORef 0
unless (isEmpty matched) $ do
(textWidth, _h) <- drawText ctx (SDL.V2 px py) colorLightGray $ Text.pack matched
modifyIORef' widthRef (const textWidth)
unless (isEmpty remaining) $ do
prevTextWidth <- readIORef widthRef
let pos = px + prevTextWidth
void $ drawText ctx (SDL.V2 pos py) textColor $ Text.pack remaining
renderGridLines :: State -> DrawContext -> IO ()
renderGridLines state ctx = do
(SDL.V2 width height) <- SDL.get $ SDL.windowSize $ ctxWindow ctx
let grid = stateCells state
let wcell = width `div` unsafeCoerce (length $ head grid)
let hcell = height `div` unsafeCoerce (length grid)
SDL.rendererDrawColor (ctxRenderer ctx) $= colorGridLines
let rows = unsafeCoerce $ length grid
let columns = unsafeCoerce $ length $ head grid
forM_ [0 .. rows] $ \rowIndex -> do
drawHorizontalLine ctx $ rowIndex * hcell
forM_ [0 .. columns] $ \colIndex -> do
drawVerticalLine ctx $ colIndex * wcell
SDL.rendererDrawColor (ctxRenderer ctx) $= colorAxisLines
drawHorizontalLine ctx (rows * hcell `div` 2)
drawVerticalLine ctx (columns * wcell `div` 2)
|
