commit 4ba7b8ec517c095eba6c742f2e1ecdbaafb92a2e
from: James Cook <falsifian@falsifian.org>
date: Mon Jan 17 22:12:08 2022 UTC

Suppress default keyboard handlers.

commit - 388ebd57548f5437bef752b02a095eafe1afa9aa
commit + 4ba7b8ec517c095eba6c742f2e1ecdbaafb92a2e
blob - b91fc2a4262b55c619ae046d2e475f7324c30256
blob + e8ab39124bd0030966bca2f9105917694a3182c7
--- src/S3D/WebUI.idr
+++ src/S3D/WebUI.idr
@@ -46,13 +46,15 @@ getGl2Context canvas =
 
 handleKeyDown : IORef UIState -> Event -> JSIO ()
 handleKeyDown stateRef event =
-  do keyboardEvent <- unMaybe "cast keyboard event" $ pure (safeCast event)
+  do preventDefault event
+     keyboardEvent <- unMaybe "cast keyboard event" $ pure (safeCast event)
      theKey <- Web.Raw.UIEvents.KeyboardEvent.key keyboardEvent
      modifyIORef stateRef $ { keysDown $= insert theKey }
 
 handleKeyUp : IORef UIState -> Event -> JSIO ()
 handleKeyUp stateRef event =
-  do keyboardEvent <- unMaybe "cast keyboard event" $ pure (safeCast event)
+  do preventDefault event
+     keyboardEvent <- unMaybe "cast keyboard event" $ pure (safeCast event)
      theKey <- Web.Raw.UIEvents.KeyboardEvent.key keyboardEvent
      modifyIORef stateRef $ { keysDown $= delete theKey }