; Autohotkey script "Toggle Mouse sensitivity"
;=================================================================================
SlowMouseSpeed      := 1
NormalMouseSpeed    := true ; State of Mouse pointer speed
UserMouseSpeed      := 0    ; Speed sensed before slow down
MouseThreshold1     := 6
MouseThreshold2     := 10
MouseEnhance        := 1

SPI_GETMOUSESPEED   := 0x70
SPI_SETMOUSESPEED   := 0x71
SPI_SETMOUSE        := 0x04

;=================================================================================
*F17::   toggleMouseSpeed()

;=================================================================================
toggleMouseSpeed() {
    global
    ; SET LOW SPEED
    if( NormalMouseSpeed )
    {
        ; SENSE BEFORE
        DllCall("SystemParametersInfo", UInt,SPI_GETMOUSESPEED, UInt,0, UIntP,prevSpeed, UInt,0)

        ; Temporarily reduces the mouse cursor's speed.
        ; Retrieve the current speed so that it can be restored later
        DllCall("SystemParametersInfo", UInt,SPI_GETMOUSESPEED, UInt,0, UIntP,UserMouseSpeed, UInt,0)
        ; Slow down mouse speed
        DllCall("SystemParametersInfo", UInt,SPI_SETMOUSESPEED, UInt,0, UInt,SlowMouseSpeed, UInt,0)

        ; SENSE AFTER
        DllCall("SystemParametersInfo", UInt,SPI_GETMOUSESPEED, UInt,0, UIntP,currentSpeed, UInt,0)
        ToolTip, Mouse slow: %currentSpeed%/20

        ; REMEMBER CURRENT STATE
        NormalMouseSpeed := false
    }
    ; RESTORE SPEED
    else {
        ; SENSE BEFORE
        DllCall("SystemParametersInfo", UInt,SPI_GETMOUSESPEED, UInt,0, UIntP,prevSpeed, UInt,0)

        ; Restore the original speed.
        DllCall("SystemParametersInfo", UInt, SPI_SETMOUSESPEED, UInt,0, UInt,UserMouseSpeed, UInt,0)

        ; Restore the original speed acceleration thresholds and speed
        VarSetCapacity(MySet, 32, 0)
        InsertInteger(MouseThreshold1, MySet, 0)
        InsertInteger(MouseThreshold2, MySet, 4)
        InsertInteger(MouseEnhance   , MySet, 8)
        DllCall("SystemParametersInfo", UInt,SPI_SETMOUSE, UInt,0, Str,MySet, UInt,1)

        ; SENSE AFTER
        DllCall("SystemParametersInfo", UInt,SPI_GETMOUSESPEED, UInt,0, UIntP,currentSpeed, UInt,0)
        ToolTip, Mouse restored: %currentSpeed%/20

        ; REMEMBER CURRENT STATE
        NormalMouseSpeed := true
    }
    SetTimer, RemoveToolTip, 1000
}
;=================================================================================
InsertInteger(pInteger, ByRef pDest, pOffset = 0, pSize = 4) {
    ; Copy each byte in the integer into the structure as raw binary data.
    Loop %pSize%
    DllCall("RtlFillMemory", "UInt",&pDest + pOffset + A_Index-1, "UInt", 1, "UChar", pInteger >> 8*(A_Index-1) & 0xFF)
}
;=================================================================================
RemoveToolTip:
SetTimer, RemoveToolTip, Off
ToolTip
return

;=================================================================================