52 lines
1.6 KiB
Elm
52 lines
1.6 KiB
Elm
-- These are nicely curated inputs from the keyboard. See the
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-- [Keyboard.Raw library](/docs/Signal/KeyboardRaw.elm) for a
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-- lower-level interface that will let you define more complicated behavior.
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module Keyboard where
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import Native.Keyboard as N
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type KeyCode = Int
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-- A signal of records indicating which arrow keys are pressed.
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--
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-- `{ x = 0, y = 0 }` when pressing no arrows.
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-- `{ x =-1, y = 0 }` when pressing the left arrow.
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-- `{ x = 1, y = 1 }` when pressing the up and right arrows.
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-- `{ x = 0, y =-1 }` when pressing the down, left, and right arrows.
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arrows : Signal { x:Int, y:Int }
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arrows = N.directions 38 40 37 39
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-- Just like the arrows signal, but this uses keys w, a, s, and d,
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-- which are common controls for many computer games.
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wasd : Signal { x:Int, y:Int }
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wasd = N.directions 87 83 65 68
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-- Custom key directions so that you can support different locales.
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-- The plan is to have a locale independent version of this function
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-- that uses the physical location of keys, but I don't know how to do it.
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directions : KeyCode -> KeyCode -> KeyCode -> KeyCode -> Signal { x:Int, y:Int }
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-- Whether an arbitrary key is pressed.
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isDown : KeyCode -> Signal Bool
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-- Whether the shift key is pressed.
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shift : Signal Bool
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shift = N.isDown 16
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-- Whether the control key is pressed.
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ctrl : Signal Bool
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ctrl = N.isDown 17
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-- Whether the space key is pressed.
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space : Signal Bool
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space = N.isDown 32
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-- Whether the enter key is pressed.
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enter : Signal Bool
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enter = N.isDown 13
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-- List of keys that are currently down.
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keysDown : Signal [KeyCode]
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-- The latest key that has been pressed.
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lastKey : Signal KeyCode
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