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  • #1

    Center common dialog on dual display

    I usualy use either SetWindowPos or MoveWindow to center a common dialog from a dialog hook procedure (during the %WM_NOTIFY message), and everything works fine except when trying to center on the second monitor in dual display mode.

    Do you have any suggestion that will work to center a common dialog on the second display?

    ...
    Patrice Terrier
    www.zapsolution.com
    www.objreader.com
    Addons: GDImage.DLL 32/64-bit (Graphic library), WinLIFT.DLL 32/64-bit (Skin Engine).
    Tags: None
  • #2
    I once started working on a solution to this one--until the caffeine hit
    and I realized that any display on a second monitor would occur only if
    the user chose to display something on a monitor other than the primary.
    So I just centered dialogs on the window, not the monitor (with shifting
    into view if the window had been shoved partly off screen). I've pretty
    much stayed with this approach ever since.

    Of course, if you're working on display of something that spans
    monitors, this issue is more complicated. Is that what you're doing?

    Comment

    • #3
      Patrice, since you are one that usually shares and do not ask often, I can kinda see what you mean when wanting to "Center On Screen"

      In this case do you mean to center across screens? or center depending on the screen that the dialog is shown?
      I assume the latter and from my limited experience centering usually caters to center on monitor (but does not take into account if the user has more than one monitor)
      Engineer's Motto: If it aint broke take it apart and fix it

      "If at 1st you don't succeed... call it version 1.0"

      "Half of Programming is coding"....."The other 90% is DEBUGGING"

      "Document my code????" .... "WHYYY??? do you think they call it CODE? "

      Comment

      • #4
        Cliff, Greg,

        See my post there:
        http://www.powerbasic.com/support/pb...ad.php?t=34949

        I was in the hope than, since i posted the same question one year ago, things could have evolved and somebody found an answer.

        Here is the code i am using , it works well with a one single monitor, but fails on the second monitor in dual display.

        Code:
        ' Dialog hook procedure, for centering the dialog and
' increasing height of filetype combo (to avoid tiny scrollbuttons)
FUNCTION zDlgHookProc(BYVAL hWnd&, BYVAL Msg&, BYVAL wParam&, BYVAL lParam&) AS LONG

    LOCAL rw AS RECT, rc AS RECT, ofnPtr AS OFNOTIFY PTR, zTxt AS ASCIIZ * %MAX_PATH
    LOCAL lp    AS POINTAPI

    STATIC hWndPreview&, SquareSize&

    SELECT CASE LONG Msg&

    CASE %WM_NOTIFY
         ofnPtr = lParam&
         SELECT CASE LONG @ofnPtr.hdr.Code

         CASE %CDN_INITDONE

              hParent& = GetParent(hWnd&)

              hSysListView& = GetDlgItem(hParent&, %lst1)

              CALL GetWindowRect(hSysListView&, rw)
              lp.X = rw.nLeft: lp.Y = rw.nTop: CALL ScreenToClient(hParent&, lp) ' 11-03-2003
              yPos& = lp.Y
              SquareSize& = rw.nBottom - rw.nTop
              IF GetSystemMetrics(%SM_CXSCREEN) < 801 THEN
                 SquareSize& = MIN&(150, SquareSize&)
              END IF

              CALL GetClientRect(hParent&, rc)       ' Get dialog pos. and size
              xPos& = rc.nRight                      ' New width

              Style& = %WS_CHILD OR %WS_VISIBLE ' OR %WS_BORDER
              StyleEx& = %WS_EX_STATICEDGE
              hWndPreview& = CreateWindowEx(StyleEx&, $GDImageClassName, _
                                 "", _               ' Optional full path name to picture
                                 Style&, _
                                 xPos&, yPos&, SquareSize&, SquareSize&, _
                                 hParent&, _
                                 %NULL, _
                                 zInstance,_
                                 BYVAL 0)                 ' creation parameters
              CALL ZI_SetProperty(hWndPreview&, %ZI_GradientTop, GetSysColor(%COLOR_BTNSHADOW))
              CALL ZI_SetProperty(hWndPreview&, %ZI_GradientBottom, GetSysColor(%COLOR_BTNSHADOW))
              CALL ZI_SetProperty(hWndPreview&, %ZI_FitToWindow, %ZI_QualityDefault)

            ' Set new size and center dialog in program window
              CALL GetWindowRect(GetParent(hParent&), rc)     ' Get program pos. and size
              W& = rc.nRight  - rc.nLeft
              H& = rc.nBottom - rc.nTop
              x& = rc.nLeft + (W& \ 2)                        ' Relative Center x&
              y& = rc.nTop  + (H& \ 2)                        ' Relative Center y&

              CALL GetWindowRect(hParent&, rc)                ' Get dialog pos. and size
              W& = rc.nRight  - rc.nLeft + SquareSize& + 7    ' New width
              H& = rc.nBottom - rc.nTop                       ' Same height
              x& = x& - (W& \ 2)                              ' Centered in program
              y& = y& - (H& \ 2)

'              hDC& = GetDC(0)                                 ' Make sure it's on screen
'              IF x& < 0 THEN x& = 0
'              IF x& + W& > GetDeviceCaps(hDC&, %HORZRES) THEN x& = GetDeviceCaps(hDC&, %HORZRES) - W&
'              IF y& < 0 THEN y& = 0
'              IF y& + H& > GetDeviceCaps(hDC&, %VERTRES) THEN y& = GetDeviceCaps(hDC&, %VERTRES) - H&
'              ReleaseDC 0, hDC&

              CALL SetWindowPos(hParent&, hParent&, x&, y&, W&, H&, %SWP_NOZORDER) ' Resize and center
              'CALL MoveWindow(hParent&, x&, y&, W&, H&, 0) ' Resize and center

            ' INCREASE HEIGHT OF DROPPED LIST IN FILETYPE COMBO (AUTO-ADJUSTS TO ITEM COUNT)
              hftCombo& = GetDlgItem(hParent&, %cmb1)         ' handle, Filetype combo
              IF hftCombo& THEN                               ' if we get handle
                 CALL GetClientRect(hftCombo&, rc)            ' get combo's width and set new height
                 CALL SetWindowPos(hftCombo&, %NULL, 0, 0, rc.nRight, 200, %SWP_NOMOVE OR %SWP_NOZORDER)
              END IF

              FUNCTION = 1: EXIT FUNCTION

         CASE %CDN_SELCHANGE ' Triggered when the selection changes in the file listbox
              picFileName$ = SPACE$(%MAX_PATH)
              df& = Sendmessage(@ofnPtr.hdr.hwndFrom, %CDM_GETFILEPATH, LEN(picFileName$), STRPTR(picFileName$))
              IF df& > 0 THEN
                 picFileName$ = LEFT$(picFileName$, df& - 1)
                 So& = INSTR(-1, picFileName$, $Dot)
                 IF So& THEN
                    ImgType$ = UCASE$(MID$(picFileName$, So&)) + $Dot
                    ImageType& = INSTR($GDIPLUSEXT, ImgType$)
                    IF ImageType& THEN

                       NewImage& = zLoadImageFromFile((picFileName$), bmW&, bmH&, 0)
                       IF zSetGdipImageHandle(hWndPreview&, NewImage&) THEN CALL ZI_UpdateWindow(hWndPreview&, %TRUE)

                    END IF
                 END IF
'
              END IF
              picFileName$ = ""

         CASE %CDN_TYPECHANGE
            ' Standard Save dialog blindly adds new extension, this changes it properly instead
              IF @[email protected] < 5 THEN             ' ignore last one, *.*
                 hftCombo& = GetDlgItem(GetParent(hWnd&), %cmb1)  ' handle, File type combo
                 IF zOsVersion < 500 THEN ID& = %edt1 ELSE ID& = %cmb13
                 hftEdit&  = GetDlgItem(GetParent(hWnd&), ID&)    ' handle, File name text field
                 CALL GetWindowText(hftEdit&, zTxt, SIZEOF(zTxt)) ' get name in text field
                 IF LEN(zTxt) THEN                                ' if we have something
                    lRes& = INSTR(-1, zTxt, $Dot)                 ' look for prefix (file type part)
                    IF lRes& THEN zTxt = LEFT$(zTxt, lRes& - 1)   ' if success, remove prefix
                    SELECT CASE LONG @[email protected]  ' compare selection against combo list
                    CASE 1: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 1)) ' ".png"                  ' and add matching prefix
                    CASE 2: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 2)) ' ".jpg"
                    CASE 3: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 3)) ' ".bmp"
                    CASE 4: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 4)) ' ".tif"
                    CASE 5: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 5)) ' ".gif"
                    CASE 6: zTxt = zTxt + $Dot + LCASE$(PARSE$(cfgStr$(40), 6)) ' ".zmi"
                    END SELECT
                    CALL SetWindowText(hftEdit&, zTxt)            ' set corrected name to text field
                END IF
             END IF
         END SELECT

    CASE %WM_DESTROY ' Destroy what we have created to avoid nasty memory leaks

    END SELECT

END FUNCTION
        Patrice Terrier
        www.zapsolution.com
        www.objreader.com
        Addons: GDImage.DLL 32/64-bit (Graphic library), WinLIFT.DLL 32/64-bit (Skin Engine).

        Comment

        • #5
          I am too busy to create a demo, but the following is a partial text of an email
          I sent to a user of Phoenix.

          For example, to get the monitor your control is on and its 'workarea'
          Code:
              hMonitor = MonitorFromWindow(hWnd, %MONITOR_DEFAULTTONEAREST)
    IF GetMonitorRect(hMonitor, %MONITOR_AREA OR %MONITOR_SCREEN, trcWork) THEN
          Some useful Urls(ordered most to least helpful)

          http://www.flounder.com/virtual_screen_coordinates.htm
          http://msdn.microsoft.com/en-us/library/ms534610.aspx
          http://www.vbaccelerator.com/home/Vb...rs/article.asp
          http://support.microsoft.com/kb/194578

          Code:
          '-----------------------------------------------------------------------------------
' BEGIN ROUTINES FOR WORKING WITH MULTIPLE MONITORS
'-----------------------------------------------------------------------------------

%MONITOR_AREA       = &H0000??          ' use monitor entire area
%MONITOR_WORKAREA   = &H0002??          ' use monitor work area

%MONITOR_SCREEN     = &H0008??          ' screen coordinates
%MONITOR_VIRTUAL    = &H0010??          ' virtual coordinates

TYPE MONITORDATA
  hMonitor    AS DWORD
  trcWork     AS RECT
  trcMonitor  AS RECT
  fPrimary    AS LONG
END TYPE

TYPE MONITORS
  cMonitors   AS LONG
  xMap        AS INTEGER
  yMap        AS INTEGER
  ptmd        AS MONITORDATA PTR
END TYPE

'----------------------------------------------------------------------
'
' FUNCTION: CopyData(LONG, LONG, LONG)
' PURPOSE:  Copies data for source to destination.
' NOTES:
' RETURNS:
'
'----------------------------------------------------------------------

FUNCTION CopyData ALIAS "CopyData" _
  ( _
    BYVAL lpSrc   AS LONG, _  ' Address of structure to copy from
    BYVAL lpDest  AS LONG, _  ' Address of structure to copy to
    BYVAL cblCopy AS LONG _   ' Count of bytes to copy
  ) EXPORT        AS LONG

  ! cld                             ; read/write forward
  ! mov ecx, cblCopy                ; put count of bytes to copy in counter
  ! mov esi, lpSrc                  ; put source address in source index
  ! mov edi, lpDest                 ; put destination address in destination index
  ! rep movsb                       ; repeat move byte from esi to edi until ecx is zero

END FUNCTION

' Dual-monitor system example.
' (The number of monitors is immaterial)
' scr  = screen coordinates
' virt = virtual coordinates
'
'  scr(-1280,0) virt(0,0)    scr(0,0) virt(1280,0)    scr(1920,0) virt(3200,0)
'            |                        |                        |
'            +------------------------+------------------------+
'            |  /|\                   |  /|\                   |
'            |   |                    |   |                    |
'            |   |                    |   |                    |
'            |<---------1280--------->|<---------1920--------->|
'            |   |                    |   |                    |
'            |   |                    |   |                    |
'            | 1024                   | 1200    primary        |
'            |   |                    |   |                    |
'            |   |                    |   |                    |
'            |   |                    |   |                    |
'            +------------------------|   |                    |
'            |                        |  \|/                   |
'            +------------------------+------------------------+
'                                                  scr(1920,1200) virt(3200,1200)

'----------------------------------------------------------------------
'
' PROCEDURE: HeapSortMonitors
'	PURPOSE:   Sorts a monitor table in ascending order using HeapSort.
'            The entries are sorted on the x or y coordinate of the
'            upper left corner of the trcWork member.
'            The table MUST be zero-based.
'
'----------------------------------------------------------------------

SUB HeapSortMonitors ALIAS "HeapSortMonitors" _
  ( _
  BYVAL ptmd  AS MONITORDATA PTR, _
  BYVAL N     AS LONG, _
  BYVAL fVert AS LONG _
  ) EXPORT

  LOCAL tmd   AS MONITORDATA
  LOCAL I     AS LONG
  LOCAL J     AS LONG
  LOCAL L     AS LONG
  LOCAL IR    AS LONG

  IF N <= 1 THEN EXIT SUB

  ' Skip heaps with size 1
  L  = N \ 2
  IR = N - 1

  DO
    IF L > 0 THEN
      DECR L
      CopyData VARPTR(@ptmd[L]), VARPTR(tmd), SIZEOF(tmd)
    ELSE
      CopyData VARPTR(@ptmd[IR]), VARPTR(tmd), SIZEOF(tmd)
      CopyData VARPTR(@ptmd[0]), VARPTR(@ptmd[IR]), SIZEOF(tmd)
      DECR IR
      IF IR = 0 THEN
        CopyData VARPTR(tmd), VARPTR(@ptmd[0]), SIZEOF(tmd)
        EXIT SUB
      END IF
    END IF
    I = L
    J = L + L + 1

    WHILE J <= IR
      IF J < IR THEN
        IF fVert THEN
          IF @ptmd[J].trcWork.nTop < @ptmd[J + 1].trcWork.nTop THEN
            INCR J
          END IF
        ELSE
          IF @ptmd[J].trcWork.nLeft < @ptmd[J + 1].trcWork.nLeft THEN
            INCR J
          END IF
        END IF
      END IF
      IF fVert THEN
        IF tmd.trcWork.nTop < @ptmd[J].trcWork.nTop THEN
          CopyData VARPTR(@ptmd[J]), VARPTR(@ptmd[I]), SIZEOF(tmd)
          I = J
          J = J + J + 1
        ELSE
          J = IR + 1
        END IF
      ELSE
        IF tmd.trcWork.nLeft < @ptmd[J].trcWork.nLeft THEN
          CopyData VARPTR(@ptmd[J]), VARPTR(@ptmd[I]), SIZEOF(tmd)
          I = J
          J = J + J + 1
        ELSE
          J = IR + 1
        END IF
      END IF
    WEND

    CopyData VARPTR(tmd), VARPTR(@ptmd[I]), SIZEOF(tmd)
  LOOP

END SUB

'-------------------------------------------------------------------------------
'
' PROCEDURE: MonitorCountEnumProc
' PURPOSE:
' RETURN:
'
'-------------------------------------------------------------------------------

FUNCTION MonitorCountEnumProc _
  ( _
  BYVAL hMonitor  AS DWORD, _ ' handle to display monitor
  BYVAL hDC       AS DWORD, _ ' handle to monitor DC
        trc       AS RECT, _  ' monitor intersection rectangle
  BYVAL lParam    AS LONG _   ' application-defined value
  ) AS LONG

  LOCAL plCount   AS LONG PTR

  plCount = lParam

  INCR @plCount


  FUNCTION = %TRUE


END FUNCTION

'-------------------------------------------------------------------------------
'
' PROCEDURE: GetDisplayMonitorCount
' PURPOSE:
' RETURN:
'
'-------------------------------------------------------------------------------

FUNCTION GetDisplayMonitorCount() AS LONG

  LOCAL cMonitors   AS LONG

  EnumDisplayMonitors %NULL, BYVAL %NULL, BYVAL CODEPTR(MonitorCountEnumProc), VARPTR(cMonitors)

  FUNCTION = cMonitors

END FUNCTION

'-------------------------------------------------------------------------------
'
' PROCEDURE: MonitorEnumProc
' PURPOSE:
' RETURN:
'
'-------------------------------------------------------------------------------

FUNCTION MonitorEnumProc _
  ( _
  BYVAL hMonitor  AS DWORD, _ ' handle to display monitor
  BYVAL hDC       AS DWORD, _ ' handle to monitor DC
        trc       AS RECT, _  ' monitor intersection rectangle
  BYVAL lParam    AS LONG _   ' application-defined value
  ) AS LONG

  LOCAL tmi       AS MONITORINFO
  LOCAL iMonitor  AS LONG

  tmi.cbSize = SIZEOF(tmi)
  IF GetMonitorInfo(hMonitor, tmi) THEN
    iMonitor = gtmonitors.cMonitors
    [email protected][iMonitor].hMonitor   = hMonitor
    [email protected][iMonitor].trcWork    = tmi.rcWork
    [email protected][iMonitor].trcMonitor = tmi.rcMonitor
    [email protected][iMonitor].fPrimary   = (tmi.dwFlags AND %MONITORINFOF_PRIMARY)
    INCR gtmonitors.cMonitors
    FUNCTION = %TRUE
  ELSE
    FUNCTION = %FALSE
  END IF

END FUNCTION

'-------------------------------------------------------------------------------
'
' PROCEDURE: GetDisplayMonitors
' PURPOSE:
' RETURN:
'
'-------------------------------------------------------------------------------

FUNCTION GetDisplayMonitors() AS LONG

  LOCAL cMonitors     AS LONG
  LOCAL iMonitor      AS LONG
  LOCAL fNotSupported AS LONG
  LOCAL lRet          AS LONG

  IF gtmonitors.ptmd THEN
    HeapFree GetProcessHeap(), 0, gtmonitors.ptmd
  END IF
  cMonitors = GetDisplayMonitorCount()

  IF cMonitors = 0 THEN
    fNotSupported = -1
    cMonitors = 1
  END IF

  gtmonitors.ptmd = HeapAlloc(GetProcessHeap(), %HEAP_ZERO_MEMORY, cMonitors * SIZEOF([email protected]))
  IF gtmonitors.ptmd THEN
    IF fNotSupported THEN
      gtmonitors.cMonitors = 1
      [email protected][0].hMonitor           = %NULL
      [email protected][0].trcMonitor.nLeft   = 0
      [email protected][0].trcMonitor.nTop    = 0
      [email protected][0].trcMonitor.nRight  = GetSystemMetrics(%SM_CXSCREEN)
      [email protected][0].trcMonitor.nBottom = GetSystemMetrics(%SM_CYSCREEN)
      lRet = SystemParametersInfo(%SPI_GETWORKAREA, SIZEOF([email protected][0].trcWork), BYVAL VARPTR([email protected][0].trcWork), 0)
      IF lRet = 0 THEN
        [email protected][0].trcWork = [email protected][0].trcMonitor
      END IF
      [email protected][0].fPrimary = -1
    ELSE
      gtmonitors.cMonitors = 0
      EnumDisplayMonitors %NULL, BYVAL %NULL, BYVAL CODEPTR(MonitorEnumProc), 0
    END IF
    iMonitor = 0

    WHILE iMonitor < gtmonitors.cMonitors
      IF [email protected][iMonitor].fPrimary THEN
        ' To convert
        ' xScreen  = xVirtual - xMap
        ' xVirtual = xScreen + xMap
        gtmonitors.xMap = [email protected][iMonitor].trcWork.nLeft
        gtmonitors.yMap = [email protected][iMonitor].trcWork.nTop
        EXIT LOOP
      END IF
      INCR iMonitor
    WEND

  END IF

END FUNCTION

'-------------------------------------------------------------------------------
'
' PROCEDURE: GetMonitorRect
' PURPOSE:
' RETURN:    Nonzero on success, zero on failure.
'
'-------------------------------------------------------------------------------

FUNCTION GetMonitorRect _
  ( _
  BYVAL hMonitor  AS DWORD, _ ' [in]
  BYVAL dwFlags   AS DWORD, _ ' [in]
        trc       AS RECT _   ' [out]
  ) AS LONG

  LOCAL iMonitor  AS LONG
  LOCAL lRet      AS LONG

  iMonitor = 0

  WHILE iMonitor < gtmonitors.cMonitors
    IF [email protected][iMonitor].hMonitor = hMonitor THEN
      ' To convert
      ' xScreen  = xVirtual - xMap
      ' xVirtual = xScreen + xMap
      IF (dwFlags AND %MONITOR_WORKAREA) THEN
        trc.nLeft   = [email protected][iMonitor].trcWork.nLeft
        trc.nTop    = [email protected][iMonitor].trcWork.nTop
        trc.nRight  = [email protected][iMonitor].trcWork.nRight
        trc.nBottom = [email protected][iMonitor].trcWork.nBottom
      ELSE
        trc.nLeft   = [email protected][iMonitor].trcMonitor.nLeft
        trc.nTop    = [email protected][iMonitor].trcMonitor.nTop
        trc.nRight  = [email protected][iMonitor].trcMonitor.nRight
        trc.nBottom = [email protected][iMonitor].trcMonitor.nBottom
      END IF
      IF (dwFlags AND %MONITOR_SCREEN) THEN
        trc.nLeft   = trc.nLeft   - gtmonitors.xMap
        trc.nTop    = trc.nTop    - gtmonitors.yMap
        trc.nRight  = trc.nRight  - gtmonitors.xMap
        trc.nBottom = trc.nBottom - gtmonitors.yMap
      END IF
      lRet = %TRUE
      EXIT LOOP
    END IF
    INCR iMonitor
  WEND

  FUNCTION = lRet

END FUNCTION

'-----------------------------------------------------------------------------------
' END ROUTINES FOR WORKING WITH MULTIPLE MONITORS
'-----------------------------------------------------------------------------------

GLOBAL gtmonitors             AS MONITORS

  ' This should be called in control InitXXX procedure or during WM_CREATE.
  ' It should also be called in response to WM_DISPLAYCHANGE
  ' WM_DISPLAYCHANGE needs to be forwarded to control
  GetDisplayMonitors
          Dominic Mitchell
          Phoenix Visual Designer
          http://www.phnxthunder.com

          Comment

          • #6
            Dominic,

            All i have tryed to change the location of a common Open/Save file dialog on my second monitor display failed, using either MoveWindow or SetWindowPos.

            I even tryed to change the location from another thread, without success.

            Thank you anyway.
            Last edited by Patrice Terrier; 11 Nov 2008, 07:26 AM.
            Patrice Terrier
            www.zapsolution.com
            www.objreader.com
            Addons: GDImage.DLL 32/64-bit (Graphic library), WinLIFT.DLL 32/64-bit (Skin Engine).

            Comment

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