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;; DoubleClick function
;; ============================================================================
;; DoubleClick returns true if a double click has been performed.
;; To use the function, call it whenever the user clicks. The function returns
;; true if two calls in a row meet the requirements for a double click.
;; Function definition -> library
;; ----------------------------------------------------------------------------
DoubleClick()
{
;; A bunch of global variables are needed to determine whether a double click
;; has been performed:
global DoubleClickClicked
global DoubleClickPriorX
global DoubleClickPriorY
global DoubleClickLast
;; The DoubleClickClicked variable should be set to false in the beginning of
;; the script: -> init
DoubleClickClicked := false
;; We'll continue the definition of the function. -> library
;; The maximum double click area (x * y) and time (in milliseconds) are
;; retrieved from Windows:
SysGet, SM_CXDOUBLECLK, 36
SysGet, SM_CYDOUBLECLK, 37
max := DllCall("User32\GetDoubleClickTime")
;; The current absolute position of the mouse is retrieved:
tmp := A_CoordModeMouse
CoordMode, Mouse, Screen
MouseGetPos, x, y
CoordMode, Mouse, %tmp%
;; The DoubleClickClicked variable, if true, signifies that a first click has
;; already been performed. If false, a double click has not been initiated.
;; If a click has not already been performed, then this is the first click.
;; The first click should be allowed to pass through, but the function takes
;; note of the click and sets the global variables against which to compare
;; the next click:
if (not DoubleClickClicked)
{
DoubleClickPriorX := x
DoubleClickPriorY := y
DoubleClickLast := A_TickCount
DoubleClickClicked := true
return false
}
;; At this point, the function has been called for the second time, signifying
;; a second click. Now, it checks whether the two clicks meet the operating
;; system's requirements for a double click; if not, then this click is treated
;; as yet another first click:
if (A_TickCount - DoubleClickLast > max
|| abs(x - DoubleClickPriorX) > SM_CXDOUBLECLK
|| abs(y - DoubleClickPriorY) > SM_CYDOUBLECLK)
{
DoubleClickPriorX := x
DoubleClickPriorY := y
DoubleClickLast := A_TickCount
DoubleClickClicked := true
return false
}
;; At this point, a double click has successfully been performed. The variable
;; signifying a first click is reset to false, and the function returns true:
DoubleClickClicked := false
return true
}
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