fix tab bar

main.fs

@@ -97,6 +97,7 @@ S" you feel like throwing some stuff into the pool." set-message
 
 : unlock-detector
 	100 devices can-afford? detector-unlocked @ 0= and if
+		S" Somebody is tinkering with some devices. Says they can build a metal detector. " set-message
 		-1 detector-unlocked ! then ;
 		
 \ the word unlock tests to see if any unlock conditions are matched, and unlocks them if they are.
@@ -168,7 +169,8 @@ S" you feel like throwing some stuff into the pool." set-message
 \ the word buy-detector buys the metal detector!
 : buy-detector
 	400 devices can-afford? if
-		1 screens +! then ;
+		1 screens +! then
+		page ;
 
 \ DEBUGGING STUFF
 
@@ -193,6 +195,14 @@ S" you feel like throwing some stuff into the pool." set-message
 
 \ END DEBUGGING STUFF
 
+\ move screen moves forward/back x screens.
+: move-screen ( x -- )
+	screen @ + dup dup
+	 0 >= swap screens @ <= and if
+		page
+		screen !
+	else drop then ;
+	
 \ the word devices-input contains the input cases specifically for the device counter screen.
 : devices-input
 	case
@@ -207,6 +217,8 @@ S" you feel like throwing some stuff into the pool." set-message
     	screen @ 0= if devices-input then 
         [char] q of exit-game endof
         [char] D of debug-console endof
+        [char] > of 1 move-screen endof
+        [char] < of -1 move-screen endof
     endcase then ;
  
 \ inc-y increments the y coordinate being drawn at.
@@ -307,7 +319,7 @@ S" you feel like throwing some stuff into the pool." set-message
 
 \ draw-screen redraws the devices screen, but only if there's been a change.
 \ ( x y -- )
-: draw-devices-screen  any-change? if draw-message draw-devices draw-blank draw-actions clear-xy clear-all else clear-xy then ;
+: draw-devices-screen draw-message draw-devices draw-blank draw-actions ;
 \ : draw-screen clear-all ;
 
 \ TODO draw the garden, this is a stub
@@ -321,7 +333,13 @@ S" you feel like throwing some stuff into the pool." set-message
 	endcase ;
 	
 \ main game loop
-: game-loop  begin wait-tick game-tick handle-input 1 1 draw-tab-bar draw-blank draw-screen 0 until ;
+: game-loop  
+	begin 
+		wait-tick game-tick handle-input 
+		any-change? if
+			 1 1 draw-tab-bar draw-blank draw-screen clear-xy clear-all
+		then 
+	0 until ;
 
 \ for use in the debugging shell
 : restart page game-loop ;