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Example of Intercepting WM_MOVING to restrict area the window can be moved to ;Autoit v3.3.14.5 Limit Form Move Example-- Bilgus 2018 #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> #include <WinAPISysWin.au3> ;_WinAPI_DefWindowProc() Global $g_hGUI, $g_idLimit Global $g_aWindowLimits = [15, 10, @DesktopWidth / 2, @DesktopHeight / 2] ; Min X, Min Y, Max X, Max Y GUIRegisterMsg($WM_MOVING, WM_MOVING) ;Register a callback function for $WM_MOVING Example() Func Example() ; Create a GUI with various controls. $g_hGUI = GUICreate("Example") $g_idLimit = GUICtrlCreateCheckbox("Limit Drag", 10, 370, 85, 25) Local $idOK = GUICtrlCreateButton("OK", 310, 370, 85, 25) ; Display the GUI. GUISetState(@SW_SHOW, $g_hGUI) ; Loop until the user exits. While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE, $idOK ExitLoop EndSwitch WEnd ; Delete the previous GUI and all controls. GUIDelete($g_hGUI) EndFunc ;==>Example Func WM_MOVING($hWnd, $iMsg, $wParam, $lParam) If $hWnd = $g_hGUI Then Local $bLimited = False ;Current rect is passed in lParam Local $tRect = DllStructCreate($tagRect, $lParam) ; (IS NOT X, Y, W, H) => (IS X, Y, X+W, Y+H) Local $iLeft = DllStructGetData($tRect, 1) Local $iTop = DllStructGetData($tRect, 2) Local $iRight = DllStructGetData($tRect, 3) Local $iBottom = DllStructGetData($tRect, 4) Local $iWidth, $iHeight ;Check left and right of window against imposed limits If $iLeft < $g_aWindowLimits[0] Then $iWidth = $iRight - $iLeft ;Calculate Original Width $iLeft = $g_aWindowLimits[0] $iRight = $iLeft + $iWidth ;Have to keep our same Width $bLimited = True ElseIf $iRight > $g_aWindowLimits[2] Then $iWidth = $iRight - $iLeft ;Calculate Original Width $iRight = $g_aWindowLimits[2] $iLeft = $iRight - $iWidth ;Have to keep our same Width $bLimited = True EndIf ;Check top and bottom of window against imposed limits If $iTop < $g_aWindowLimits[1] Then $iHeight = $iBottom - $iTop ;Calculate Original Height $iTop = $g_aWindowLimits[1] $iBottom = $iTop + $iHeight ;Have to keep our same Height $bLimited = True ElseIf $iBottom > $g_aWindowLimits[3] Then $iHeight = $iBottom - $iTop ;Calculate Original Height $iBottom = $g_aWindowLimits[3] $iTop = $iBottom - $iHeight ;Have to keep our same Height $bLimited = True EndIf If $bLimited And BitAND(GUICtrlRead($g_idLimit), $GUI_CHECKED) Then ;Limit happened -- Pass new Values Back to WndProc DllStructSetData($tRect, 1, $iLeft) DllStructSetData($tRect, 2, $iTop) DllStructSetData($tRect, 3, $iRight) DllStructSetData($tRect, 4, $iBottom) _WinAPI_DefWindowProc($hWnd, $iMsg, $wParam, $lParam);Pass new Rect on to default window procedure Return 1 ; True EndIf EndIf Return $GUI_RUNDEFMSG ;Default Handler EndFunc ;==>WM_MOVING