DDL（dropdownlist）选择穿透难题的解决方案，高手请进，新手勿进！！

问题：新建GUI界面，添加DDL后，点击DDL弹出下来菜单后，点击菜单后，如果这时候菜单下有别的控件，神奇的事情发生了！被遮挡的控件可以响应点击！如下例子：

#NoEnv
#SingleInstance force

Gui, +AlwaysOnTop +E0x08000000
Gui Add, DDL, w55, option 1||option 2|option 3
Gui Add, Picture, w55 h30 +Border hwndPic gtest,
Gui Show, AutoSize NoActivate, DDL Click Problem
return

test:
MsgBox, 262144,, % A_ThisLabel, 1
return

mouseIsOverControl(__controlID) {
    MouseGetPos,,,, __outputVarControl, 2
return (__outputVarControl = __controlID)
}

#If mouseIsOverControl(Pic)
~LButton::ToolTip, test
return

解决方案：替换 MouseGetPos为controlgetpos

如下：

#NoEnv
#Warn
#SingleInstance force
; Windows 8.1 64 bit
; Autohotkey v1.1.27.07 32-bit Unicode


Gui, +AlwaysOnTop +E0x08000000
Gui Add, DDL, w85 hwndCID, option 1||option 2|option 3
listHwnd := GUIDropDownList_listGetHwnd(CID) ; retrieve the list HWND and and store it in 'listHwnd'
Gui Add, Picture, w65 h30 +Border hwndPic gtest,
Gui Show, AutoSize NoActivate, DDL Click Problem
return

test:
MsgBox, 262144,, % A_ThisLabel, 1
return


#If (isControlVisible(listHwnd) && mouseisoverControl(listHwnd))
~LButton::
GuiControlGet, var,, % CID
ToolTip, % var, 0, 0
SendInput, {Alt Down}{Esc}{ALt Up}
return
#If

GUIDropDownList_listGetHwnd(__hwnd) { ; https://autohotkey.com/boards/viewtopic.php?f=5&p=187310#post_content187289
	VarSetCapacity(COMBOBOXINFO, (cbCOMBOBOXINFO:=(A_PtrSize == 8) ? 64 : 52), 0), NumPut(cbCOMBOBOXINFO, COMBOBOXINFO, 0, "UInt")
return (DllCall("GetComboBoxInfo", "Ptr", __hwnd, "Ptr", &COMBOBOXINFO)) ? NumGet(COMBOBOXINFO, cbCOMBOBOXINFO - A_PtrSize, "Ptr") : null
}
isControlVisible(__controlID) {
static WS_VISIBLE := "0x10000000"
	ControlGet, __style, Style,,, % "ahk_id " . __controlID
return (__style & WS_VISIBLE)
} ; https://autohotkey.com/board/topic/1555-determine-if-a-window-is-visible/

mouseIsOverControl(__controlHwnd) {
__coordMode := A_CoordModeMouse ; A_CoordModeMouse contains the current setting of CoordMode, Mouse
CoordMode, Mouse, Window
MouseGetPos, __mousex, __mousey
ControlGetPos, __x, __y, __w, __h,, % "ahk_id " . __controlHwnd
CoordMode, Mouse, % __coordMode ; restore CoordMode, Mouse to its previous setting
return (Between(__x, __x+__w, __mousex) && Between(__y, __y+__h, __mousey)) ; is the mouse over the control?
}
Between(__lowerBound, __upperBound, __var) { ; simple function wrapper for the if between... syntax
If __var between %__lowerBound% and %__upperBound%
	return true
return false
}