Implement message window

src/Zenith/CLI.hs

@@ -3,11 +3,10 @@
 module Zenith.CLI where
 
 import Control.Monad (void)
-import Control.Monad.State (modify)
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
 import qualified Graphics.Vty as V
-import Lens.Micro ((^.))
+import Lens.Micro ((&), (.~), (^.), set)
 import Lens.Micro.Mtl
 import Lens.Micro.TH
 
@@ -20,9 +19,12 @@ import qualified Brick.Widgets.Border as B
 import Brick.Widgets.Border.Style (unicode)
 import qualified Brick.Widgets.Center as C
 import Brick.Widgets.Core
-  ( (<+>)
+  ( Padding(..)
+  , (<+>)
+  , (<=>)
   , hLimit
   , joinBorders
+  , padRight
   , str
   , vBox
   , vLimit
@@ -40,10 +42,11 @@ data Name
   deriving (Eq, Show, Ord)
 
 data State = State
-  { _network :: String
-  , _wallets :: L.List Name String
-  , _addresses :: L.List Name String
-  , _transactions :: L.List Name String
+  { _network :: !String
+  , _wallets :: !(L.List Name String)
+  , _addresses :: !(L.List Name String)
+  , _transactions :: !(L.List Name String)
+  , _msg :: !String
   } deriving (Show)
 
 makeLenses ''State
@@ -57,7 +60,8 @@ drawUI s = [ui s]
       withBorderStyle unicode $
       B.borderWithLabel (str $ "Zenith - " <> s ^. network) $
       (C.center (listBox "Addresses" (s ^. addresses)) <+>
-       B.vBorder <+> C.center (listBox "Transactions" (s ^. transactions)))
+       B.vBorder <+> C.center (listBox "Transactions" (s ^. transactions))) <=>
+      msgBox (s ^. msg)
     listBox :: String -> L.List Name String -> Widget Name
     listBox titleLabel l =
       C.vCenter $
@@ -68,6 +72,10 @@ drawUI s = [ui s]
         , str " "
         , C.hCenter $ str "Select "
         ]
+    msgBox :: String -> Widget Name
+    msgBox m =
+      vBox
+        [B.hBorderWithLabel (str "Messages"), hLimit 70 $ padRight Max $ str m]
 
 listDrawElement :: (Show a) => Bool -> a -> Widget Name
 listDrawElement sel a =
@@ -84,6 +92,7 @@ initialState =
     (L.list WList (Vec.fromList ["wall1"]) 1)
     (L.list AList (Vec.fromList ["addr1", "addr2"]) 1)
     (L.list TList (Vec.fromList ["tx1", "tx2", "tx3"]) 1)
+    "Start up Ok!"
 
 customAttr :: A.AttrName
 customAttr = L.listSelectedAttr <> A.attrName "custom"
@@ -92,7 +101,14 @@ appEvent :: BT.BrickEvent Name e -> BT.EventM Name State ()
 appEvent (BT.VtyEvent e) =
   case e of
     V.EvKey V.KEsc [] -> M.halt
+    V.EvKey (V.KChar 'c') [] -> printMsg "You pressed C!"
+    V.EvKey (V.KChar 's') [] -> printMsg "You pressed S!"
     ev -> BT.zoom addresses $ L.handleListEvent ev
+  where
+    printMsg :: String -> BT.EventM Name State ()
+    printMsg s = BT.modify $ updateMsg s
+    updateMsg :: String -> State -> State
+    updateMsg = set msg
 
 theMap :: A.AttrMap
 theMap =