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module TextViewport.Viewport.Position where
import TextViewport.Render.RenderedBuffer (RenderedBuffer)
import TextViewport.Render.RenderedBuffer qualified as RenderedBuffer
import TextViewport.Render.RenderedLine qualified as RenderedLine
import TextViewport.Viewport.Viewport (Viewport)
import TextViewport.Viewport.Viewport qualified as Viewport
lookupPosition
:: Int
-> Int
-> Viewport
-> RenderedBuffer
-> Maybe (Int, Int)
lookupPosition x y vp rb =
let allLines = RenderedBuffer.flatten rb
idx = Viewport.vpOffset vp + y
in case drop idx allLines of
(rl:_) ->
let charIx = RenderedLine.rlCharStart rl + x
in Just (RenderedLine.rlItemIx rl, charIx)
[] -> Nothing
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