Surface Pen (SP4版)頂按鈕自定 by AHK

Surface Pen (SP4版)的頂按鈕(top button)可用AutoHotKey(AHK)重新定義功能。
網路上有人找到對應的AHK key symbol，所以可以輕鬆重定。
請見：http://www.mobile01.com/topicdetail.php?f=163&t=4655109&p=1#58663460

我以桌面版PowerPoint為例，寫了一個script，它可以按一下頂按鈕，
讓筆在PowerPoint的Presentation mode中切換劃筆與雷射筆。連按兩下，換下一張slide。長按一下，換上一張slide。PowerPoint以外的程式則維持原功能。script如下：

; Redefine Surface Pen (SP4) top button for PowerPoint Presentation mode.

; Initialized global variables.
class gv {
        static penMode := 0
}

; Single click for switching between pens.
#F20::
        ; Programs except PowerPoint.
        If !WinActive("ahk_exe POWERPNT.exe") {
                Send, #{F20}
                Return
        }
        ; Switch to Laser Pen.
        If (gv.penMode == 0) {
                Send, ^l
                gv.penMode := 1
        }
        ; Switch to Pen.
        Else {
                ; Sleep for a while before sending ^p.
                ; Otherwise, sometime PowerPoint goes back one page.
                ; I don't know why.
                Sleep, 50
                Send, ^p
                gv.penMode := 0
        }
        Return

; Double clicks for next slide.
#F19::
        ; Programs except PowerPoint.
        If !WinActive("ahk_exe POWERPNT.exe") {
                Send, #{F19}
                Return
        }
        Send, {Right}
        Return

; Long press for previous slide.
#F18::
        ; Programs except PowerPoint.
        If !WinActive("ahk_exe POWERPNT.exe") {
                Send, #{F18}
                Return
        }
        Send, {Left}
        Return