Extend GridSelect navigation

Ignore-this: f2d279b8e46e6eaf3477fdc5cf77be63
Add moveNext and movePrev, which move selection to next/previous item.

darcs-hash:20110515154246-c5067-e117b3d5753e868963b36a10d2e17ccc427a97b7.gz

1 files changed, 26 insertions, 1 deletions

diff --git a/XMonad/Actions/GridSelect.hs b/XMonad/Actions/GridSelect.hs
index d9413e0..d0d14db 100644
--- a/XMonad/Actions/GridSelect.hs
+++ b/XMonad/Actions/GridSelect.hs
@@ -60,6 +60,7 @@ module XMonad.Actions.GridSelect (
     -- * Navigation Components
     setPos,
     move,
+    moveNext, movePrev,
     select,
     cancel,
     transformSearchString
@@ -404,6 +405,30 @@ move (dx,dy) = do
       newPos = (x+dx,y+dy)
   setPos newPos
 
+moveNext :: TwoD a ()
+moveNext = do
+  position <- gets td_curpos
+  elems <- gets td_elementmap
+  let n = length elems
+      m = case findIndex (\p -> fst p == position) elems of
+               Nothing -> Nothing
+               Just k | k == n-1 -> Just 0
+                      | otherwise -> Just (k+1)
+  whenJust m $ \i ->
+      setPos (fst $ elems !! i)
+
+movePrev :: TwoD a ()
+movePrev = do
+  position <- gets td_curpos
+  elems <- gets td_elementmap
+  let n = length elems
+      m = case findIndex (\p -> fst p == position) elems of
+               Nothing -> Nothing
+               Just 0  -> Just (n-1)
+               Just k  -> Just (k-1)
+  whenJust m $ \i ->
+      setPos (fst $ elems !! i)
+
 -- | Apply a transformation function the current search string
 transformSearchString :: (String -> String) -> TwoD a ()
 transformSearchString f = do
@@ -661,4 +686,4 @@ gridselectWorkspace :: GSConfig WorkspaceId ->
                           (WorkspaceId -> WindowSet -> WindowSet) -> X ()
 gridselectWorkspace conf viewFunc = withWindowSet $ \ws -> do
     let wss = map W.tag $ W.hidden ws ++ map W.workspace (W.current ws : W.visible ws)
-    gridselect conf (zip wss wss) >>= flip whenJust (windows . viewFunc)
\ No newline at end of file
+    gridselect conf (zip wss wss) >>= flip whenJust (windows . viewFunc)