From 1f460f7ebc10c2f8bb66ae684498f49187eab9bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Fri, 23 Oct 2020 01:44:02 +0200
Subject: first commit

---
 tt.doubleclick.ahk | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 tt.doubleclick.ahk

(limited to 'tt.doubleclick.ahk')

diff --git a/tt.doubleclick.ahk b/tt.doubleclick.ahk
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+;; DoubleClick function
+;; ============================================================================
+
+;; DoubleClick returns true if a double click has been performed. The first
+;; click in the double click is allowed to pass through, but the second click
+;; is prevented.
+
+;; 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
+;; ----------------------------------------------------------------------------
+
+;; The 'alternate' argument, if set to true, signifies a right click:
+
+DoubleClick(alternate := false)
+{
+  
+;; 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)
+  {
+    if (alternate)
+      SendInput, {Click, right}
+    else
+      SendInput, {Click}
+    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)
+  {
+    if (alternate)
+      SendInput, {Click, right}
+    else
+      SendInput, {Click}
+    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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