Display mouse and key presses on screen - above mouse pointer while typing (support multiple actions), then fade into top right corner

## KeypressOSD.ahk
; KeypressOSD.ahk

;----------------------------------------------------------
; KeypressOSD_stacked v1.00
; Author    : peter.hozak@gmail.com
; Date      :  2015-04-21
; Tested on : Windows 8/AutoHotkey 1.1.19.03
; Thanks    : KeypressOSD by tmplinshi - http://ahkscript.org/boards/viewtopic.php?f=6&t=225
;             HotShow.ahk by RaptorX - http://www.autohotkey.com/board/topic/51641-hotshow-10-osd-hotkeys-for-video-tutorials/
; TODO: icons from https://openclipart.org/detail/216312/mouse-right-click
;----------------------------------------------------------

#SingleInstance force
#NoEnv
SetBatchLines, -1
ListLines, Off
CoordMode, Mouse, Screen

; Settings
transN        := 60    ; 0=transparent, 255=opaque
ShowSingleKey := True  ; display A-Z, Enter and other keys pressed without modifier (Ctr, Alt, ...)
DisplayTime   := 1000  ; time to fade, in milliseconds

; Create GUI
Gui, +AlwaysOnTop -Caption +Owner +LastFound +E0x20
Gui, Margin, 0, 0
Gui, Color, Black
Gui, Font, cWhite s30 bold, Arial
Gui, Add, Text, vHotkeyText Center y50
WinSet, Transparent, %transN%
Winset, AlwaysOnTop, On
SetTimer, ShowHotkey, 100

; Create hotkey
Loop, 95
    Hotkey, % "~*" Chr(A_Index + 31), Display
Loop, 24 ; F1-F24
    Hotkey, % "~*F" A_Index, Display
Loop, 10 ; Numpad0 - Numpad9
    Hotkey, % "~*Numpad" A_Index - 1, Display
Hotkey, ~*LButton, Display
Hotkey, ~*RButton, Display
Hotkey, ~*MButton, Display
Otherkeys := "NumpadDiv|NumpadMult|NumpadAdd|NumpadSub|Tab|Enter|Esc|BackSpace|Del|Insert|Home|End|PgUp|PgDn|Up|Down|Left|Right|ScrollLock|CapsLock|NumLock|Pause"
Loop, parse, Otherkeys, |
    Hotkey, % "~*" A_LoopField, Display
return

; Display
;
PreviousKey := ""
Display:
    If (A_ThisHotkey = "")
        Return
    mods   := "Ctrl|Shift|Alt|LWin|RWin"
    prefix := ""
    Loop, Parse, mods, |
        if GetKeyState(A_LoopField)
            prefix .= A_LoopField "+"
    if (!prefix && !ShowSingleKey)
        return
    key := PreviousKey prefix SubStr(A_ThisHotkey, 3)
    PreviousKey := key " "
    if (key = " ")
        key := "Space"
    LastHotkeyPressedTime := A_TickCount
Return

; Show Gui element with the hotkeys, move with mouse and fade into transparency
ShowHotkey:
    prev_X := -999
    prev_Y := -999
    prev_LastHotkeyPressedTime := "999"
    Gui, +LastFound
    Loop {
        Elapsed := A_TickCount - LastHotkeyPressedTime
        Faded := 1 - Elapsed/DisplayTime
        if (prev_LastHotkeyPressedTime != LastHotkeyPressedTime) {
            WinSet, Transparent, % transN
        } else if (Faded > 0.1) {
            WinSet, Transparent, % transN * Faded
        }
        MouseGetPos, X, Y
        if (prev_LastHotkeyPressedTime != LastHotkeyPressedTime or (((abs(prev_X - X) > 1 or abs(prev_Y - Y) > 1) or Faded < 0) and PreviousKey != "")) {
            text_w := StrLen(key) * 20 + 50
            if (Faded < 0.1) {
                adjusted_X := A_ScreenWidth - text_w
                adjusted_Y := 0
                WinSet, Transparent, % 50
                PreviousKey :=
            } else {
                adjusted_X := X - text_w / 2 - 5
                adjusted_Y := Y - 55
            }
            GuiControl,, HotkeyText, %key%
            GuiControl, Move, HotkeyText, +AlwaysOnTop w%text_w%
            WinSet, Region, 0-0 W%text_w% H50 R50-50
            Gui, Show, NoActivate x%adjusted_X% y%adjusted_Y% w%text_w%
            prev_X := X
            prev_Y := Y
            prev_LastHotkeyPressedTime := LastHotkeyPressedTime
        }
        Sleep, 20
    }
Return