; wheel up/down check
; use AutoHotKey v1.1.24.05

#SingleInstance, Force
#InstallMouseHook

appliname=wheelupdown_check_01
appliver=0.0.1
wtitle=%appliname% %appliver%

; GUI settings

; Gui, +Owner +AlwaysOnTop +Resize -SysMenu -MinimizeBox -MaximizeBox -Disabled -Caption -Border +ToolWindow
Gui, +Owner +AlwaysOnTop +Resize -MinimizeBox -MaximizeBox
Gui, Color, 336699
Gui, Font, CFFFFFF S26 W700 Q2, Arial
Gui, Add, Text, Vkeystext, Alt+Q ... Exit
Gui, Show, NoActivate, %wtitle%
; GuiControl, , keystext,
WinSet, Transparent, 220, %wtitle%

cwheeldown = 0
cwheelup = 0
check_cwheeldown = 0
check_cwheelup = 0

ks=WheelDown WheelUp Space Up Down Left Right BS
keyslist := Object()
nowstate := Object()
oldstate := Object()
Loop, Parse, ks, %A_Space%
{
  k=%A_LoopField%
  v=%k%
  keyslist.Insert(k, v)
  nowstate.Insert(k, 0)
  oldstate.Insert(k, 0)
}

Loop, 
{
  For k, v in keyslist
  {
    n := nowstate[k]
    oldstate[k] := n
    nowstate[k] := 0
    If k=WheelDown
    {
      If cwheeldown<>%check_cwheeldown%
      {
        check_cwheeldown := cwheeldown
        nowstate[k] := 1
      }
    }
    Else If k=WheelUp
    {
      If cwheelup<>%check_cwheelup%
      {
        check_cwheelup := cwheelup
        nowstate[k] := 1
      }
    }
    Else
    {
        nowstate[k] := GetKeyState(k)
    }
  }
  
  keys=
  For k, v in keyslist
  {
    If (nowstate[k] + oldstate[k])=1
      If nowstate[k]<>0
        keys=%keys% %k%
  }
  keys := Trim(keys, " ")
  
  If keys<>
    GuiControl, , keystext, %keys%
  
  Sleep, 16
}

EXIT:
GuiClose:
  ExitApp

~*WheelDown::
  cwheeldown += 1
  return
  
~*WheelUp::
  cwheelup += 1
  return

~!Q Up::
  ; Alt + Q ... Exit
  Goto, EXIT