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|
{- Event handlers for Lazymail
-
- Copyright 2013 Raúl Benencia <rul@kalgan.cc>
-
- Licensed under the GNU GPL version 3 or higher
-}
module Handlers where
import Control.Monad.State
import Maildir
import State
import Types (LazymailCurses)
previousMode :: Mode -> LazymailCurses ()
previousMode IndexMode = (=<<) put $ get >>= \st -> return st { mode = MaildirMode }
previousMode EmailMode = (=<<) put $ get >>= \st -> return st { mode = IndexMode }
previousMode MaildirMode = (=<<) put $ get >>= \st -> return st { exitRequested = True }
changeMode IndexMode = (=<<) put $ get >>= \st -> return st { mode = EmailMode }
changeMode EmailMode = return ()
changeMode MaildirMode = do
st <- get
selectedEmails' <- liftIO $ do
let md = (selectedMD . maildirState) $ st
getMaildirEmails md
let indexState' = (indexState st) {
selectedEmails = selectedEmails'
, currentInLen = length selectedEmails'
, scrollBufferIn = scrollCrop (scrollRowIn . indexState $ st) (screenRows st) selectedEmails'
}
put $ st { mode = IndexMode, indexState = indexState' }
incSelectedRow IndexMode = do
st <- get
let inSt = indexState st
if (selectedRowIn inSt) > (div (screenRows st) 2)
then do
let scrollRowIn' = scrollRowIn inSt + 1
let scrollBufferIn' = scrollCrop scrollRowIn' (screenRows st) $ selectedEmails inSt
let inSt' = inSt { scrollRowIn = scrollRowIn', scrollBufferIn = scrollBufferIn' }
put st { indexState = inSt' }
else put $ incrementSelectedRow st
incSelectedRow _ = (=<<) put $ get >>= \st -> return $ incrementSelectedRow st
decSelectedRow IndexMode = do
st <- get
let inSt = indexState st
if (scrollRowIn inSt) > 0
then do
let scrollRowIn' = scrollRowIn inSt - 1
let scrollBufferIn' = scrollCrop scrollRowIn' (screenRows st) $ selectedEmails inSt
let inSt' = inSt { scrollRowIn = scrollRowIn', scrollBufferIn = scrollBufferIn' }
put st { indexState = inSt' }
else put $ decrementSelectedRow st
decSelectedRow _ = (=<<) put $ get >>= \st -> return $ decrementSelectedRow st
{- Given a list, it returns the elements that will be in the next screen refresh
- TODO: find a better name -}
scrollCrop top rows xs = take rows $ drop top xs
|
