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Following script shows a parent GUI with a child GUI initialized as MDICHILD. #include <Constants.au3> #include <GUIConstantsEx.au3> #include <GuiReBar.au3> #include <GuiScrollBars.au3> #include <GuiToolbar.au3> #include <ScreenCapture.au3> #include <ScrollBarConstants.au3> #include <WindowsConstants.au3> _GDIPlus_Startup() Global Enum $idNew = 1000, $idOpen, $idSave, $idHelper Global Const $iImageW = @DesktopWidth, $iImageH = @DesktopHeight Global Const $hBMP_ScreenCapture = _ScreenCapture_Capture("", 0, 0, $iImageW, $iImageH, False) Global Const $hBitmap = _GDIPlus_BitmapCreateFromHBITMAP($hBMP_ScreenCapture) Sleep(50) Global Const $iW = 1500, $iH = 700, $SC_DRAGMOVE = 0xF012 Global Const $hGUI = GUICreate("Move child GUI within GUI", $iW, $iH) Global Const $hToolbar = _GUICtrlToolbar_Create($hGUI) Global Const $hReBar = _GUICtrlRebar_Create($hGUI, BitOR($CCS_TOP, $RBS_VARHEIGHT, $RBS_AUTOSIZE, $RBS_BANDBORDERS)) Global Const $height_delta = 37 Global Const $idPic = GUICtrlCreatePic("", 0, $height_delta + 2, $iW, $iH) Global $hBitmap_tmp, $hHBitmap_tmp $hBitmap_tmp = _GDIPlus_BitmapCreateFromScan0($iW, $iH) Global $hGfx_Context = _GDIPlus_ImageGetGraphicsContext($hBitmap_tmp) _GUICtrlToolbar_AddBitmap($hToolbar, 1, -1, $IDB_STD_LARGE_COLOR) _GUICtrlToolbar_AddButton($hToolbar, $idNew, $STD_FILENEW) _GUICtrlToolbar_AddButton($hToolbar, $idOpen, $STD_FILEOPEN) _GUICtrlToolbar_AddButton($hToolbar, $idSave, $STD_FILESAVE) _GUICtrlToolbar_AddButtonSep($hToolbar) _GUICtrlToolbar_AddButton($hToolbar, $idHelper, $STD_HELP) _GUICtrlRebar_AddToolBarBand($hReBar, $hToolbar, "", 0) Global Const $iVSscroll = _WinAPI_GetSystemMetrics(2) Global Const $iHSscroll = _WinAPI_GetSystemMetrics(3) Global Const $iYCaption = _WinAPI_GetSystemMetrics(4) Global Const $iYFixedFrame = _WinAPI_GetSystemMetrics(8) Global Const $iXFixedFrame = _WinAPI_GetSystemMetrics(7) Global Const $iMetricsSumX = $iVSscroll + $iXFixedFrame * 2 Global Const $iMetricsSumY = $iHSscroll + $iYCaption + $iYFixedFrame _GUIScrollBars_Init($hGUI) _GUIScrollBars_SetScrollInfoMin($hGUI, $SB_HORZ, 0) _GUIScrollBars_SetScrollInfoMax($hGUI, $SB_HORZ, $iImageW - $iW + 61 + $iMetricsSumX) _GUIScrollBars_SetScrollInfoMin($hGUI, $SB_VERT, 0) _GUIScrollBars_SetScrollInfoMax($hGUI, $SB_VERT, $iImageH - $iH + $iMetricsSumY + $height_delta - 1) GUISetState(@SW_SHOW, $hGUI) Global Const $STM_SETIMAGE = 0x0172 _WinAPI_DeleteObject(GUICtrlSendMsg($idPic, $STM_SETIMAGE, $IMAGE_BITMAP, $hBMP_ScreenCapture)) Global $IE_offset_x = 0, $IE_offset_y = 0 DrawImage($hGfx_Context, $hBitmap, $IE_offset_x, $IE_offset_y, $iW, $iH) GUIRegisterMsg($WM_HSCROLL, "WM_HSCROLL_IE") GUIRegisterMsg($WM_VSCROLL, "WM_VSCROLL_IE") Global $iPosX_Crop = 0, $iPosY_Crop = 0, $iW_crop = 200, $iH_crop = 200, $bMove_Crop = True Global $hGUI_IE_Crop = GUICreate("", $iW_crop, $iH_crop, $iPosX_Crop, $iPosY_Crop) GUISetStyle(BitOR($WS_BORDER, $WS_POPUP), $WS_EX_MDICHILD) _WinAPI_SetParent($hGUI_IE_Crop, $hGUI) WinSetTrans($hGUI_IE_Crop, "", 0xA0) Global $iLable_CropMove = GUICtrlCreateLabel("", 0, 0, $iW_crop, $iH_crop, -1, $GUI_WS_EX_PARENTDRAG) GUISetState(@SW_SHOW, $hGUI_IE_Crop) GUIRegisterMsg($WM_MOVE, "WM_MOVE_IE_GUI_Crop") ;~ GUIRegisterMsg($WM_LBUTTONDOWN, "_WM_LBUTTONDOWN") Do Switch GUIGetMsg() Case $GUI_EVENT_CLOSE ExitLoop EndSwitch Until False GUIRegisterMsg($WM_HSCROLL, "") GUIRegisterMsg($WM_VSCROLL, "") GUIRegisterMsg($WM_MOVE, "") GUIRegisterMsg($WM_LBUTTONDOWN, "") _WinAPI_DeleteObject($hBMP_ScreenCapture) _GDIPlus_BitmapDispose($hBitmap_tmp) _GDIPlus_BitmapDispose($hBitmap) _GDIPlus_GraphicsDispose($hGfx_Context) _GDIPlus_Shutdown() Exit Func WM_HSCROLL_IE($hWnd, $iMsg, $wParam, $lParam) #forceref $iMsg, $lParam Local $Min, $Max, $Page, $TrackPos ; Get all the horizontal scroll bar information Local $tSCROLLINFO_X = _GUIScrollBars_GetScrollInfoEx($hWnd, $SB_HORZ) $Min = DllStructGetData($tSCROLLINFO_X, "nMin") $Max = DllStructGetData($tSCROLLINFO_X, "nMax") $Page = DllStructGetData($tSCROLLINFO_X, "nPage") ; Save the position for comparison later on $IE_offset_x = DllStructGetData($tSCROLLINFO_X, "nPos") $TrackPos = DllStructGetData($tSCROLLINFO_X, "nTrackPos") #forceref $Min, $Max Local $nScrollCode = BitAND($wParam, 0x0000FFFF) Switch $nScrollCode Case $SB_LINELEFT ; user clicked left arrow DllStructSetData($tSCROLLINFO_X, "nPos", $IE_offset_x - 1) Case $SB_LINERIGHT ; user clicked right arrow DllStructSetData($tSCROLLINFO_X, "nPos", $IE_offset_x + 1) Case $SB_PAGELEFT ; user clicked the scroll bar shaft left of the scroll box DllStructSetData($tSCROLLINFO_X, "nPos", $IE_offset_x - $Page) Case $SB_PAGERIGHT ; user clicked the scroll bar shaft right of the scroll box DllStructSetData($tSCROLLINFO_X, "nPos", $IE_offset_x + $Page) Case $SB_THUMBTRACK ; user dragged the scroll box DllStructSetData($tSCROLLINFO_X, "nPos", $TrackPos) EndSwitch DllStructSetData($tSCROLLINFO_X, "fMask", $SIF_POS) _GUIScrollBars_SetScrollInfo($hWnd, $SB_HORZ, $tSCROLLINFO_X) $IE_offset_x = DllStructGetData($tSCROLLINFO_X, "nPos") DrawImage($hGfx_Context, $hBitmap, $IE_offset_x, $IE_offset_y, $iW, $iH) $hHBitmap_tmp = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hBitmap_tmp) _WinAPI_DeleteObject(GUICtrlSendMsg($idPic, $STM_SETIMAGE, $IMAGE_BITMAP, $hHBitmap_tmp)) _WinAPI_DeleteObject($hHBitmap_tmp) $bMove_Crop = False ConsoleWrite($iPosX_Crop & ", " & $iPosY_Crop & " / " & $IE_offset_x & ", " & $IE_offset_y & @CRLF) WinMove($hGUI_IE_Crop, "", -$IE_offset_x + $iPosX_Crop, -$IE_offset_y + $iPosY_Crop) ;~ DllCall("user32.dll", "bool", "MoveWindow", "hwnd", $hGUI_IE_Crop, "int", -$IE_offset_x + $iPosX_Crop, "int", -$IE_offset_y + $iPosY_Crop, "int", $iW_crop, "int", $iH_crop, "bool", True) $bMove_Crop = True Return "GUI_RUNDEFMSG" EndFunc ;==>WM_HSCROLL_IE Func WM_VSCROLL_IE($hWnd, $iMsg, $wParam, $lParam) #forceref $iMsg, $lParam Local $Min, $Max, $Page, $TrackPos ;~ ; Get all the horizontal scroll bar information Local $tSCROLLINFO_Y = _GUIScrollBars_GetScrollInfoEx($hWnd, $SB_VERT) $Min = DllStructGetData($tSCROLLINFO_Y, "nMin") $Max = DllStructGetData($tSCROLLINFO_Y, "nMax") $Page = DllStructGetData($tSCROLLINFO_Y, "nPage") ; Save the position for comparison later on $IE_offset_y = DllStructGetData($tSCROLLINFO_Y, "nPos") $TrackPos = DllStructGetData($tSCROLLINFO_Y, "nTrackPos") #forceref $Min, $Max Local $nScrollCode = BitAND($wParam, 0x0000FFFF) Switch $nScrollCode Case $SB_LINELEFT ; user clicked left arrow DllStructSetData($tSCROLLINFO_Y, "nPos", $IE_offset_y - 1) Case $SB_LINERIGHT ; user clicked right arrow DllStructSetData($tSCROLLINFO_Y, "nPos", $IE_offset_y + 1) Case $SB_PAGELEFT ; user clicked the scroll bar shaft left of the scroll box DllStructSetData($tSCROLLINFO_Y, "nPos", $IE_offset_y - $Page) Case $SB_PAGERIGHT ; user clicked the scroll bar shaft right of the scroll box DllStructSetData($tSCROLLINFO_Y, "nPos", $IE_offset_y + $Page) Case $SB_THUMBTRACK ; user dragged the scroll box DllStructSetData($tSCROLLINFO_Y, "nPos", $TrackPos) EndSwitch DllStructSetData($tSCROLLINFO_Y, "fMask", $SIF_POS) _GUIScrollBars_SetScrollInfo($hWnd, $SB_VERT, $tSCROLLINFO_Y) $IE_offset_y = DllStructGetData($tSCROLLINFO_Y, "nPos") DrawImage($hGfx_Context, $hBitmap, $IE_offset_x, $IE_offset_y, $iW, $iH) $bMove_Crop = False ConsoleWrite($iPosX_Crop & ", " & $iPosY_Crop & " / " & $IE_offset_x & ", " & $IE_offset_y & @CRLF) WinMove($hGUI_IE_Crop, "", -$IE_offset_x + $iPosX_Crop, -$IE_offset_y + $iPosY_Crop) ;~ DllCall("user32.dll", "bool", "MoveWindow", "hwnd", $hGUI_IE_Crop, "int", -$IE_offset_x + $iPosX_Crop, "int", -$IE_offset_y + $iPosY_Crop, "int", $iW_crop, "int", $iH_crop, "bool", True) $bMove_Crop = True Return "GUI_RUNDEFMSG" EndFunc ;==>WM_VSCROLL_IE Func _WM_LBUTTONDOWN($hWnd, $iMsg, $wParam, $lParam) _SendMessage($hGUI_IE_Crop, $WM_SYSCOMMAND, $SC_DRAGMOVE, 0) EndFunc ;==>_WM_LBUTTONDOWN Func WM_MOVE_IE_GUI_Crop($hWnd, $iMsg, $wParam, $lParam) #forceref $iMsg, $wParam If $hWnd = $hGUI_IE_Crop And $bMove_Crop Then $iPosX_Crop = _WinAPI_LoWord($lParam) $iPosY_Crop = _WinAPI_HiWord($lParam) EndIf Return "GUI_RUNDEFMSG" EndFunc ;==>WM_MOVE_IE_GUI_Crop Func WM_SIZE_IE_GUI_Crop($hWnd, $iMsg, $wParam, $lParam) Return $GUI_RUNDEFMSG EndFunc ;==>WM_SIZE_IE_GUI_Crop Func DrawImage($hGfx_Context, $hBitmap, $IE_offset_x, $IE_offset_y, $iW, $iH) _GDIPlus_GraphicsDrawImageRectRect($hGfx_Context, $hBitmap, $IE_offset_x, $IE_offset_y, $iW, $iH, 0, 0, $iW, $iH) $hHBitmap_tmp = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hBitmap_tmp) _WinAPI_DeleteObject(GUICtrlSendMsg($idPic, $STM_SETIMAGE, $IMAGE_BITMAP, $hHBitmap_tmp)) _WinAPI_DeleteObject($hHBitmap_tmp) EndFunc My problem: if you move the child window at left upper corner to another place and move either H or V scrollbar the child GUI will be moved properly. BUT if you have scrolled the scrollbars to the right bottom of the image and move the child GUI to that corner, too then the child GUI jumps if you click on one of the scrollbars. Is there something that I didn't consider?