Re: Quick: Center CHOOSECOLOR Dialog

From:

"John Carson" <jcarson_n_o_sp_am_@netspace.net.au>

Newsgroups:

microsoft.public.vc.language

Date:

Wed, 14 Jun 2006 02:55:03 +1000

Message-ID:

<#9CRpowjGHA.1320@TK2MSFTNGP04.phx.gbl>

"DHarray" <info@floriangilles.de> wrote in message
news:%23NMHnGwjGHA.4636@TK2MSFTNGP04.phx.gbl

Hello,

How to center a common dialog on the screen (c++, non mfc)? It's a
"choose color" dialog from the common dialogs of windows.

I can't find any parameter which do this.

Thanks

You can have a "hook" window procedure that centers the dialog when it
processes WM_INITDIALOG.

1. Add CC_ENABLEHOOK to the Flags field of the CHOOSECOLOR structure.

2. Define a window procedure like:

UINT_PTR CALLBACK CCHookProc(HWND hdlg,
    UINT message,
    WPARAM wParam,
    LPARAM lParam
)
{
     if(message == WM_INITDIALOG)
     {
          RECT workspaceRect, windowRect;
          int leftedge, topedge;

          GetWindowRect(hdlg, &windowRect);
          SystemParametersInfo(SPI_GETWORKAREA, 0, &workspaceRect, 0);
          leftedge = ((workspaceRect.right - workspaceRect.left)
                                 - (windowRect.right - windowRect.left))/2;
          topedge = ((workspaceRect.bottom - workspaceRect.top)
                                 - (windowRect.bottom - windowRect.top))/2;

          SetWindowPos(hdlg, 0, leftedge, topedge, 0, 0,
                                        SWP_NOSIZE | SWP_NOZORDER);

          return TRUE;
     }
     return FALSE;
}

3. Set the lpfnHook field of the CHOOSECOLOR structure to equal CCHookProc.

--
John Carson