/*
 * dialog.c - Handles the Windows 3.1 common dialogs.
 *
 * Created by Microsoft Corporation.
 * (c) Copyright Microsoft Corp. 1990 - 1992  All Rights Reserved
 */

//--- INCLUDES ---

#include <windows.h>                   //- WINDOWS
#include <ole.h>                       //- OLE

#include "global.h"                    //- global 
#include "demorc.h"		               //- String table constants 
#include "register.h"		            //- Class registration library
#include "utility.h"
#include "dialog.h"
#include "object.h"

//--- GLOBALS ---
                                       //- strings used with commdlg
char        szDefExtension[CBMESSAGEMAX];
char        szFilterSpec[CBFILTERMAX];
char        szInsertFilter[CBFILTERMAX];
char        szLastDir[CBPATHMAX];
OPENFILENAME OFN;
HWND        hwndProp = NULL;
HWND        hRetry;

/***************************************************************************
 * OfnInit() 
 * Initializes the standard file dialog OFN structure.
 **************************************************************************/

void FAR OfnInit(                      //- ENTRY:
   HANDLE         hInst                //- instance handle
){                                     //- LOCAL:
   LPSTR          lpstr;               //- string pointer

   LoadString(hInst, IDS_FILTER, szFilterSpec, CBMESSAGEMAX);
   LoadString(hInst, IDS_EXTENSION, szDefExtension, CBMESSAGEMAX);

   OFN.lStructSize    = sizeof(OPENFILENAME);
   OFN.hInstance      = hInst;
   OFN.nMaxCustFilter = CBFILTERMAX;
   OFN.nMaxFile       = CBPATHMAX;
   OFN.lCustData      = NULL;
   OFN.lpfnHook       = NULL;
   OFN.lpTemplateName = NULL;
   OFN.lpstrFileTitle = NULL;
                                       //- Construct the filter string 
                                       //- for the Open and Save dialogs 
   lpstr = (LPSTR)szFilterSpec;
   lstrcat(lpstr, " (*.");
   lstrcat(lpstr, szDefExtension);
   lstrcat(lpstr, ")");
   lpstr += lstrlen(lpstr) + 1;

   lstrcpy(lpstr, "*.");
   lstrcat(lpstr, szDefExtension);
   lpstr += lstrlen(lpstr) + 1;
   *lpstr = 0;

   RegMakeFilterSpec(NULL, NULL, (LPSTR)szInsertFilter);

}

/***************************************************************************
 * OfnGetName() 
 *
 * Calls the standard file dialogs to get a file name
 **************************************************************************/

BOOL FAR OfnGetName(                   //- ENTRY:
   HWND           hwnd,                //- parent window handle
   LPSTR          szFileName,          //- File name
   WORD           msg                  //- operation
){                                     //- LOCAL:
   BOOL           frc;                 //- return flag
   char           szCaption[CBMESSAGEMAX];//- dialog caption

   OFN.hwndOwner       = hwnd;               //- window
   OFN.nFilterIndex    = 1;
   OFN.lpstrInitialDir = (LPSTR)szLastDir;
   OFN.Flags           = OFN_HIDEREADONLY;

   switch (msg)                        //- message
   {                                   
      case IDM_OPEN:                   //- open file
         Normalize(szFileName);
         OFN.lpstrDefExt = (LPSTR)szDefExtension;
         OFN.lpstrFile   = (LPSTR)szFileName;
         OFN.lpstrFilter = (LPSTR)szFilterSpec;
         LoadString(hInst, IDS_OPENFILE, szCaption, CBMESSAGEMAX);
         OFN.lpstrTitle  = (LPSTR)szCaption;
         OFN.Flags       |= OFN_FILEMUSTEXIST;
         return GetOpenFileName((LPOPENFILENAME)&OFN);
         break;

      case IDM_SAVEAS:                 //- save as file
         Normalize(szFileName);
         OFN.lpstrDefExt = (LPSTR)szDefExtension;
         OFN.lpstrFile   = (LPSTR)szFileName;
         OFN.lpstrFilter = (LPSTR)szFilterSpec;
         LoadString(hInst, IDS_SAVEFILE, szCaption, CBMESSAGEMAX);
         OFN.lpstrTitle  = (LPSTR)szCaption;
         OFN.Flags       |= OFN_PATHMUSTEXIST;
         return GetSaveFileName((LPOPENFILENAME)&OFN);
         break;
                                       
      case IDM_INSERTFILE:             //- insert file
         OFN.lpstrDefExt = NULL;
         OFN.lpstrFile   = (LPSTR)szFileName;
         OFN.lpstrFilter = (LPSTR)szInsertFilter;
         LoadString(hInst, IDS_INSERTFILE, szCaption, CBMESSAGEMAX);
         OFN.lpstrTitle  = (LPSTR)szCaption;
         OFN.Flags      |= OFN_FILEMUSTEXIST;
         frc             = GetOpenFileName((LPOPENFILENAME)&OFN);
         AddExtension(&OFN);
         return frc;
         break;

      default:                         //- default
         break;
   }

}

/***************************************************************************
 * OfnGetNewLinkName() - Sets up the "Change Link..." dialog box
 *
 * returns LPSTR - fully qualified filename  
 **************************************************************************/

LPSTR FAR OfnGetNewLinkName(           //- ENTRY:
   HWND           hwnd,                //- calling window or dialog
   LPSTR          lpstrData            //- link data
){                                     //- LOCAL:
   LPSTR          lpReturn = NULL;     //- return string
   LPSTR          lpstrFile = NULL;    //- non-qualified file name   
   LPSTR          lpstrPath = NULL;    //- pathname
   LPSTR          lpstrTemp = NULL;    //- work string
   char           szDocFile[CBPATHMAX];//- document name
   char           szDocPath[CBPATHMAX];//- document path name
   char           szServerFilter[CBPATHMAX]; 
   char           szCaption[CBMESSAGEMAX];

                                       //- Figure out the link's path 
                                       //- name and file name 
   lpstrTemp = lpstrData;
   while (*lpstrTemp++);
   lpstrPath = lpstrFile = lpstrTemp;

   while (*(lpstrTemp = AnsiNext(lpstrTemp)))
      if (*lpstrTemp == '\\')
         lpstrFile = lpstrTemp + 1;
                                        //- Copy the document name
   lstrcpy(szDocFile, lpstrFile);
   *(lpstrFile - 1) = 0;
                                          //- Copy the path name 
   lstrcpy(szDocPath, ((lpstrPath != lpstrFile) ? lpstrPath : ""));
   if (lpstrPath != lpstrFile)           //- Restore the backslash
      *(lpstrFile - 1) = '\\';
   while (*lpstrFile != '.' && *lpstrFile)//- Get the extension 
	lpstrFile++;
                                          //- Make a filter that respects 
                                          //- the link's class name 
   OFN.hwndOwner       = hwnd;
   OFN.nFilterIndex    = RegMakeFilterSpec(lpstrData, lpstrFile, szServerFilter);
   OFN.lpstrDefExt     = NULL;
   OFN.lpstrFile       = (LPSTR)szDocFile;
   OFN.lpstrFilter     = (LPSTR)szServerFilter;
   OFN.lpstrInitialDir = (LPSTR)szDocPath;
   LoadString(hInst, IDS_CHANGELINK, szCaption, CBMESSAGEMAX);
   OFN.lpstrTitle     = (LPSTR)szCaption;
   OFN.lpstrCustomFilter = NULL;
   OFN.Flags          = OFN_HIDEREADONLY | OFN_FILEMUSTEXIST;

                                           //- If we get a file... */
   if (GetOpenFileName((LPOPENFILENAME)&OFN)) 
   {
      if (!(lpReturn = GlobalLock(GlobalAlloc(LHND, CBPATHMAX))))
         goto Error;

      AddExtension(&OFN);
      lstrcpy(lpReturn, szDocFile);

      OFN.lpstrInitialDir = (LPSTR)szLastDir;
   }

   return lpReturn;                    //- SUCCESS return

Error:                                 //- ERROR Tag

   return NULL;                        //- ERROR return
   
}

/***************************************************************************
 * Normalize()  
 * Removes the path specification from the file name.
 *
 * Note:  It isn't possible to get "<drive>:<filename>" as input because
 *        the path received will always be fully qualified.
 **************************************************************************/

void Normalize(                        //- ENTRY:
   LPSTR          lpstrFile            //- file name
){                                     //- LOCAL:
   LPSTR          lpstrBackslash = NULL;//- back slash
   LPSTR          lpstrTemp = lpstrFile;//- file name

   while (*lpstrTemp) 
   {
      if (*lpstrTemp == '\\')
         lpstrBackslash = lpstrTemp;

      lpstrTemp = AnsiNext(lpstrTemp);
   }
   if (lpstrBackslash)
      lstrcpy(lpstrFile, lpstrBackslash + 1);

}

/***************************************************************************
 * AddExtension() 
 *
 * Adds the extension corresponding to the filter dropdown.
 **************************************************************************/

void AddExtension(                     //- ENTRY:
   LPOPENFILENAME lpOFN                //- open file structure
){

   if (lpOFN->nFileExtension == (WORD)lstrlen(lpOFN->lpstrFile) 
         && lpOFN->nFilterIndex) 
   {
      LPSTR   lpstrFilter = (LPSTR)lpOFN->lpstrFilter;

      while (*lpstrFilter && --lpOFN->nFilterIndex) 
      {
         while (*lpstrFilter++) ;
         while (*lpstrFilter++) ;
      }
                                       //- If we got to the filter, 
      if (*lpstrFilter)                //- retrieve the extension 
      {
         while (*lpstrFilter++) ;
         lpstrFilter++;
                                       //- Copy the extension 
         if (lpstrFilter[1] != '*')
            lstrcat(lpOFN->lpstrFile, lpstrFilter);
      }
   }

}
/****************************************************************************
 *  fnInsertNew()
 *
 *  Dialog procedure for the Insert New dialog.
 *
 *  Returns int - TRUE if message processed, FALSE otherwise
 ***************************************************************************/

BOOL FAR PASCAL fnInsertNew(           //- ENTRY:
   HWND           hDlg,                //- standard dialog box paramters
   unsigned       msg, 
   WORD           wParam, 
   LONG           lParam               //- (LPSTR) class name
){                                     //- LOCAL:
   HWND           hwndList;            //- handle to listbox 
   static LPSTR   lpClassName;         //- classname for return value
   
   hwndList = GetDlgItem(hDlg, IDD_LISTBOX);

   switch (msg) 
   {
      case WM_INITDIALOG:
         if (!RegGetClassNames(hwndList))
            EndDialog(hDlg, IDCANCEL);

         lpClassName = (LPSTR)lParam;
         SetFocus(hwndList);
         SendMessage(hwndList, LB_SETCURSEL, 0, 0L);
         return (FALSE);

      case WM_COMMAND:
         switch (wParam) 
         {
            case IDD_LISTBOX:
               if (HIWORD(lParam) != LBN_DBLCLK)
               break;

            case IDOK:
               if (!RegCopyClassName(hwndList, lpClassName))
                  wParam = IDCANCEL;

            case IDCANCEL:
               EndDialog(hDlg, wParam);
               break;
         }
         break;
   }
   return FALSE;              

}

/***************************************************************************
 * LinkProperties();
 *
 * Manage the link properties dialog box.
 **************************************************************************/

void FAR LinkProperties()             
{                                      //- LOCAL
   FARPROC        lpfnProperties;      //- Properties

   lpfnProperties   = MakeProcInstance(fnProperties, hInst);
   DialogBox (
      hInst, 
      MAKEINTRESOURCE(DTPROP), 
      hwndFrame, 
      lpfnProperties 
   );
   FreeProcInstance(lpfnProperties);

}

/***************************************************************************
 * fnProperties()
 *
 * Dialog procedure for link properties. The Links dialog allows the user to
 * change the link options, edit/play the object, cancel the link as 
 * well change links.
 *
 *	returns BOOL - TRUE if processed, FALSE otherwise
 **************************************************************************/

BOOL FAR PASCAL fnProperties(          //- ENTRY:
   HWND           hDlg,                //- standard dialog box parameters
   unsigned       msg,                       
   WORD           wParam, 
   LONG           lParam               //- (HWND) child window with focus
){                                     //- LOCAL:
  static APPITEMPTR *pLinks;           //- pointer to links (associated windows)
  static int      nLinks;              //- number of links
  static HWND     hwndList;            //- handle to listbox window 
  static BOOL     fTry;

   switch (msg) 
   {
	   case WM_INITDIALOG: 
         hwndProp = hDlg;
         hwndList = GetDlgItem(hDlg, IDD_LINKNAME);
         if (!(InitLinkDlg(hDlg, &nLinks, hwndList, &pLinks)))
            EndDialog(hDlg, TRUE);
         UpdateLinkButtons(hDlg,nLinks,hwndList,pLinks);
         break;

      case WM_COMMAND: 
      {
         switch (wParam) 
         {
           case IDD_CHANGE:            //- change links
               BLOCK_BUSY(fTry);
               if (ChangeLinks(hDlg,nLinks,hwndList,pLinks))
                  DisplayUpdate(nLinks,hwndList,pLinks, FALSE);
               return TRUE;

           case IDD_FREEZE:            //- cancel links
               BLOCK_BUSY(fTry);
               CancelLinks(hDlg,nLinks,hwndList,pLinks);
               UpdateLinkButtons(hDlg,nLinks,hwndList,pLinks);
               return TRUE;

           case IDD_UPDATE:            //- update links
               BLOCK_BUSY(fTry);
               DisplayUpdate(nLinks,hwndList,pLinks,TRUE);
               UpdateLinkButtons(hDlg,nLinks,hwndList,pLinks);
               return TRUE;

            case IDD_AUTO:
            case IDD_MANUAL:           //- change link update options
               BLOCK_BUSY(fTry);
               if (!SendMessage(GetDlgItem(hDlg,wParam),BM_GETCHECK, 0, 0L))
               {
                  CheckRadioButton(hDlg, IDD_AUTO ,IDD_MANUAL ,wParam);
                  ChangeUpdateOptions(hDlg,nLinks,hwndList,pLinks, 
                     (wParam == IDD_AUTO ? oleupdate_always : oleupdate_oncall));
                  UpdateLinkButtons(hDlg,nLinks,hwndList,pLinks);
               }
               return TRUE;

           case IDD_LINKNAME:          
               if (HIWORD(lParam) == LBN_SELCHANGE)
                  UpdateLinkButtons(hDlg,nLinks,hwndList,pLinks);
               return TRUE;

            case IDCANCEL:
               BLOCK_BUSY(fTry);
               UndoObjects();
               END_PROP_DLG(hDlg,pLinks);
               return TRUE;  

            case IDOK:
               BLOCK_BUSY(fTry);
               DelUndoObjects(FALSE);
               END_PROP_DLG(hDlg,pLinks);
               return TRUE;  
         }  
      }
   }   
   return FALSE;
}


/****************************************************************************
 * InitLinkDlg();
 *
 * Initialize the list box of links.
 ***************************************************************************/

static BOOL InitLinkDlg (              //- ENTRY:
   HWND           hDlg,                //- dialog box handle
   int            *nLinks,             //- pointer to number of links
   HWND           hwndList,            //- listbox handle
   APPITEMPTR     **pLinks             //- list of window handles of links 
){                                     //- LOCAL
   APPITEMPTR     pItem;               //- application item pointer
   LPSTR          lpstrData = NULL;    //- pointer to link data
   char           szFull[CBMESSAGEMAX * 4];//- list box entry string
   char           pLinkData[OBJECT_LINK_MAX];//- holder of link data
   BOOL           fSelect = FALSE;     //- item selected flag
   HANDLE         hWork;               //- working memory handle
   APPITEMPTR     pTop;                //- pointer to the top object

   if (!(*pLinks = (APPITEMPTR *)LocalLock(LocalAlloc(LHND,sizeof(APPITEMPTR)*10))))
   {  
      ErrorMessage(E_FAILED_TO_ALLOC); 
      return NULL;
   }   
   *nLinks = 0;
                                       //- set tabs
   SendMessage(hwndList,WM_SETREDRAW,FALSE,0L);
                                       //- enumerate child windows
   for (pTop = pItem = GetTopItem(); pItem; pItem = GetNextItem(pItem))
   {
      if (pItem->otObject == OT_LINK && pItem->fVisible) 
      {
         *(*pLinks + *nLinks) = pItem; 
         if (!((*nLinks += 1)%10))
         {                             //- add blocks of ten
            hWork = LocalHandle((WORD)*pLinks);
            LocalUnlock(hWork);
            if (!(hWork = LocalReAlloc(hWork,(*nLinks+10)*sizeof(APPITEMPTR),NULL)))
            {
               ErrorMessage(E_FAILED_TO_ALLOC);
               return FALSE;           //- ERROR return
            }
            *pLinks = (APPITEMPTR *)LocalLock(hWork);
         }

         if (pTop == pItem)
            fSelect = TRUE;

         if (!ObjGetData(pItem, pLinkData))
            continue;
                                       //- make listbox entry
         MakeListBoxString(pLinkData, szFull, pItem->uoObject);
                                       //- add listbox entry
         SendMessage(hwndList, LB_ADDSTRING, 0, (LONG)(LPSTR)szFull);
      }
   }

   if (fSelect)
      SendMessage(hwndList, LB_SETSEL, 1, 0L);
   
   SendMessage(hwndList,WM_SETREDRAW,TRUE,0L);
   UpdateWindow(hwndList);            

   return TRUE;                        //- SUCCESS return
                                       
}

/****************************************************************************
 * MakeListBoxString()
 *
 * build an listbox entry string
 ***************************************************************************/

static void MakeListBoxString(         //- ENTRY:
   LPSTR          lpLinkData,          //- pointer to link data
   LPSTR          lpBoxData,           //- return string
   OLEOPT_UPDATE  oleopt_update        //- OLE update option
){                                     //- LOCAL:
   char           szType[CBMESSAGEMAX];//- holds update option string
   LPSTR          lpTemp;              //- working string pointer
   int            i;                   //- index
   
                                       //- get classname
   RegGetClassId(lpBoxData, lpLinkData);
   lstrcat(lpBoxData, " - ");           //- ads tab
      
   while (*lpLinkData++);              //- skip to document name

   lpTemp = lpLinkData;
   while (*lpTemp)                     //- copy document name;
   {                                   //- strip drive an directory
      if (*lpTemp == '\\' || *lpTemp == ':')
         lpLinkData = lpTemp + 1;
      lpTemp = AnsiNext(lpTemp);
   }
   lstrcat(lpBoxData, lpLinkData);
   lstrcat(lpBoxData, " - ");
 
   while (*lpLinkData++);              //- copy item data
   lstrcat(lpBoxData, lpLinkData);
   lstrcat(lpBoxData, " - ");
                                       //- add update option string
   switch (oleopt_update)
   {
      case oleupdate_always: i = SZAUTO; break;
      case oleupdate_oncall: i = SZMANUAL; break;
      default: i = SZFROZEN;
   }
   LoadString(hInst, i, szType, CBMESSAGEMAX);
   lstrcat(lpBoxData, szType);

}                                      //- SUCCESS return

/***************************************************************************
 * UpdateLinkButtons()
 *
 * Keep link buttons active as appropriate.  This routine is called after
 * a selection is made so the buttons reflect the selected items.
 **************************************************************************/

static void UpdateLinkButtons(         //- ENTRY:
   HWND           hDlg,                //- dialog box handle
   int            nLinks,              //- number of links
   HWND           hwndList,            //- listbox handle
   APPITEMPTR     *pLinks              //- pointer to link's window handles
){                                     //- LOCAL:
   ATOM           aCurName=0;          //- atom of current doc
   BOOL           fChangeLink = TRUE;  //- enable/disable changelink button
   int            iAuto,iManual,i;     //- count of manual and auto links
   APPITEMPTR     pItem;               //- application item pointer
   int            iStatic;

   iStatic = iAuto = iManual = 0;

   for (i = 0; i < nLinks; i++)        //- enum selected links    
   {
      if (SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         if (pItem->otObject == OT_STATIC)
            iStatic++;
         else
         {
            switch(pItem->uoObject) 
            {                          //- count number of manual and 
               case oleupdate_always:  //- automatic links selected
                  iAuto++;
                  break;
               case oleupdate_oncall:
                  iManual++;
                  break;
            }
                                       //- check if all selected links are
            if (!aCurName)             //- linked to same file
               aCurName = pItem->aLinkName;
            else if (aCurName != pItem->aLinkName)
               fChangeLink = FALSE;
         }
      }
   }

   if (!(iAuto || iManual || iStatic)  //- if no links disable all buttons
      || (!iAuto && !iManual && iStatic))
   {
      EnableWindow(GetDlgItem(hDlg, IDD_FREEZE), FALSE );
      EnableWindow(GetDlgItem(hDlg, IDD_CHANGE), FALSE );
      EnableWindow(GetDlgItem(hDlg, IDD_UPDATE), FALSE );
      CheckDlgButton(hDlg, IDD_AUTO, FALSE);
      EnableWindow(GetDlgItem(hDlg, IDD_AUTO),FALSE);
      CheckDlgButton(hDlg, IDD_MANUAL, FALSE);
      EnableWindow(GetDlgItem(hDlg, IDD_MANUAL),FALSE);
   }
   else
   { 
      EnableWindow(GetDlgItem(hDlg, IDD_UPDATE), TRUE );
      EnableWindow(GetDlgItem(hDlg, IDD_FREEZE), TRUE );

      if (iAuto && iManual || !(iAuto || iManual))
      {                                //- Set update buttons 
         CheckDlgButton(hDlg, IDD_AUTO, FALSE);
         EnableWindow(GetDlgItem(hDlg, IDD_AUTO),FALSE);
         CheckDlgButton(hDlg, IDD_MANUAL, FALSE);
         EnableWindow(GetDlgItem(hDlg, IDD_MANUAL),FALSE);
      }
      else 
      {
         EnableWindow(GetDlgItem(hDlg, IDD_MANUAL), TRUE);
         EnableWindow(GetDlgItem(hDlg, IDD_AUTO), TRUE);
         if (iAuto)
         {  
            CheckDlgButton(hDlg, IDD_AUTO, TRUE);
            CheckDlgButton(hDlg, IDD_MANUAL, FALSE);
         }
         else
         {
            CheckDlgButton(hDlg, IDD_AUTO, FALSE);
            CheckDlgButton(hDlg, IDD_MANUAL, TRUE);
         }
      }
   } 

   EnableWindow(GetDlgItem(hDlg, IDD_CHANGE),fChangeLink && aCurName);

}

/****************************************************************************
 * ChangeLinks()
 *
 * This routine changes the linked data if the user chooses a new file to
 * replace the old document data portion of the linked date.  The routine
 * does nothing if the user cancels.
 *
 * returns TRUE - if data changed FALSE if user cancel or err.
 ***************************************************************************/

static BOOL ChangeLinks(               //- ENTRY:
   HWND           hDlg,                //- dialog handle
   int            nLinks,              //- number of links in listbox
   HWND           hwndList,            //- listbox
   APPITEMPTR     *pLinks              //- list of application link handles
){                                     //- LOCAL
   int            i;                   //- general index
   HANDLE         hWork;               //- work
   APPITEMPTR     pItem;               //- application item
   LPSTR          lpNewDoc = NULL;     //- new document
   ATOM           aOldDoc;             //- atom of old doc. name
   ATOM           aCurDoc = NULL;      //- atom of change-to doc. name
   BOOL           fMessage = FALSE;    //- error message flag
   LPSTR          lpLinkData;          //- pointer to link data
   
   lpLinkData = NULL;
                                       //- This loop finds all selected links
   for (i = 0; i < nLinks; i++)        //- and updates them
   {
      if (SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         CHECK_IF_STATIC(pItem);

         pItem->lpLinkData = lpLinkData;
         if (!ObjGetData(pItem,NULL))
            continue;

         if (!lpNewDoc)
         {
            if (!(lpNewDoc = OfnGetNewLinkName(hDlg, pItem->lpLinkData)))
              return FALSE;            //- ERROR jump
            aOldDoc = pItem->aLinkName;
            aCurDoc = AddAtom(lpNewDoc);
            SendMessage(hwndList,WM_SETREDRAW,FALSE,0L);
         }

         ObjSaveUndo(pItem);  
         ObjChangeLinkData(pItem,lpNewDoc);
         pItem->aLinkName = aCurDoc;
         lpLinkData = pItem->lpLinkData;

         CHANGE_LISTBOX_STRING(hwndList, i, pItem, pItem->lpLinkData);

         pItem->lpLinkData = NULL;
      }
   }                                   

   /*************************************************************************
   * now deal with non-selected links and look for a match...
   *************************************************************************/

                                       //- this loop finds non-selected links
   for (i = 0; i < nLinks; i++)        //- and asks the user to update these?
   {
      if (!SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         if (pItem->otObject == OT_STATIC)
            continue;
         
         if (!ObjGetData(pItem,NULL))
            continue;

         if (pItem->aLinkName == aOldDoc)
         {
            if (!fMessage)
            {
               char szMessage[2*CBMESSAGEMAX+3*CBPATHMAX];
               char szRename[2*CBMESSAGEMAX];
               char szOldDoc[CBMESSAGEMAX];
               LPSTR pOldDoc;
            
               GetAtomName(aOldDoc,szOldDoc,CBMESSAGEMAX);
               pOldDoc =(LPSTR)UnqualifyPath(szOldDoc); 
               LoadString(hInst, IDS_RENAME, szRename, 2*CBMESSAGEMAX);
               wsprintf(
                     szMessage,
                     szRename,
                     pOldDoc,
                     (LPSTR)UnqualifyPath(szFileName),
                     pOldDoc
               );

               if (MessageBox(hDlg, szMessage, 
                  szAppName, MB_YESNO | MB_ICONEXCLAMATION) == IDNO) 
                  break;
               fMessage = TRUE;
            }

            ObjSaveUndo(pItem);  
            ObjChangeLinkData(pItem,lpNewDoc);
            CHANGE_LISTBOX_STRING(hwndList, i, pItem, pItem->lpLinkData);
  
            pItem->aLinkName = aCurDoc;
         }
      }
   } 

   if(lpNewDoc)
   {
      hWork = (HANDLE)GlobalHandle(HIWORD(lpNewDoc));
      GlobalUnlock(hWork);
      GlobalFree(hWork);
   }

   if (lpLinkData)
      FreeLinkData(lpLinkData);

   SendMessage(hwndList,WM_SETREDRAW,TRUE,0L);
   InvalidateRect(hwndList,NULL,TRUE);
   UpdateWindow(hwndList);

   WaitForAllObjects();

   if (aCurDoc)
      DeleteAtom(aCurDoc);

   return(TRUE);
}

/****************************************************************************
 * DisplayUpdate()
 *
 * Get the most up to date rendering information and show it.  
 ***************************************************************************/

static void DisplayUpdate(             //- ENTRY:
   int            nLinks,              //- number of links in listbox
   HWND           hwndList,            //- listbox
   APPITEMPTR     *pLinks,             //- list of application link handles
   BOOL           fSaveUndo            //- save undo objects
){                                     //- LOCAL:
   int            i;                   //- index
   APPITEMPTR     pItem;               //- temporary item pointer
 

   for (i = 0; i < nLinks; i++) 
      if (SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         CHECK_IF_STATIC(pItem);
         if (fSaveUndo)
            ObjSaveUndo(pItem);
         Error(OleUpdate(pItem->lpObject));
      }

   WaitForAllObjects();

}

/****************************************************************************
 * UndoObjects()
 *
 * Bring objects back to their original state.
 ***************************************************************************/

static void UndoObjects()
{                                     
   APPITEMPTR     pItem;               //- application item pointer
                                       //- enum objects
   for (pItem = GetTopItem(); pItem; pItem = GetNextItem(pItem))
      if (pItem->lpObjectUndo) 
         ObjUndo(pItem);
   
   WaitForAllObjects();

}


/****************************************************************************
 * DelUndoObjects()
 *
 * remove all objects created for undo operation.
 ***************************************************************************/

static void DelUndoObjects(            //- ENTRY:
   BOOL           fPrompt              //- prompt user?
){                                     //- LOCAL:
   APPITEMPTR     pItem;               //- application item pointer
   BOOL           fPrompted = FALSE;   //- prompted user?
 
   for (pItem = GetTopItem(); pItem; pItem = GetNextItem(pItem))
   {
      if (pItem->lpObjectUndo) 
      {
         if (fPrompt && !fPrompted)    //- prompt user in activation case
         {
            char szPrompt[CBMESSAGEMAX];

            LoadString(hInst, IDS_SAVE_CHANGES, szPrompt, CBMESSAGEMAX);

            if (MessageBox(hwndFrame, szPrompt, 
                  szAppName, MB_YESNO | MB_ICONEXCLAMATION) == IDNO)
            {
               UndoObjects(); 
               return;                 //- user canceled operation
            }
            fPrompted = TRUE;
         }
        ObjDelUndo(pItem);             //- delete udo object
      }
   }

   WaitForAllObjects();

}                                      //- SUCCESS return

/****************************************************************************
 * CancelLinks()
 ***************************************************************************/

static void CancelLinks(               //- ENTRY:
   HWND           hDlg,                //- calling dialog
   int            nLinks,              //- number of links in listbox
   HWND           hwndList,            //- listbox
   APPITEMPTR     *pLinks              //- list of application link handles
){                                     //- LOCAL:
   APPITEMPTR     pItem;               //- application item pointer
   int            i;                   //- index
   char           pLinkData[OBJECT_LINK_MAX];//- holder of link data

   SendMessage(hwndList,WM_SETREDRAW,FALSE,0L);
   for (i = 0; i < nLinks; i++) 
      if (SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         CHECK_IF_STATIC(pItem);
         ObjGetData(pItem,pLinkData);
         ObjSaveUndo(pItem);
         ObjFreeze(pItem);

         CHANGE_LISTBOX_STRING(hwndList, i, pItem, pLinkData);
      }

   SendMessage(hwndList,WM_SETREDRAW,TRUE,0L);
   InvalidateRect(hwndList,NULL,TRUE);
   UpdateWindow(hwndList);

}
         

/****************************************************************************
 * ChangeUpdateOptions()
 *
 * Change the update options for all selected objects.
 ***************************************************************************/

static void ChangeUpdateOptions(       //- ENTRY:
   HWND           hDlg,                //- calling dialog
   int            nLinks,              //- number of links in listbox
   HWND           hwndList,            //- listbox
   APPITEMPTR     *pLinks,             //- list of application link handles
   OLEOPT_UPDATE  lUpdate              //- update option
){                                     //- LOCAL:
   APPITEMPTR     pItem;               //- application item
   int            i;                   //- index
   char           pLinkData[OBJECT_LINK_MAX];

   SendMessage(hwndList,WM_SETREDRAW,FALSE,0L);
   
   for (i = 0; i < nLinks; i++)        //- enum selected objects
   {
      if (SendMessage(hwndList, LB_GETSEL, i, 0L))
      {
         pItem = *(pLinks+i);
         CHECK_IF_STATIC(pItem);
         ObjGetData(pItem,pLinkData);
         ObjSaveUndo(pItem);
         if (Error(OleSetLinkUpdateOptions(pItem->lpObject,lUpdate)))
            continue;
         pItem->uoObject = lUpdate;

         CHANGE_LISTBOX_STRING(hwndList, i, pItem, pLinkData);
      }
   }

   SendMessage(hwndList,WM_SETREDRAW,TRUE,0L);
   InvalidateRect(hwndList,NULL,TRUE);
   UpdateWindow(hwndList);
   WaitForAllObjects();

}
/****************************************************************************
 * InvalidLink()
 *
 * Deal with letting the user know that the program has inadvertently come
 * across an invalid link.
 * 
 * Global fPropBoxActive - flag to determine whether or not the link dialog 
 *                         box is active.  If it is not active we give the
 *                         user an opportunity to enter the links property
 *                         dialog directly from here.
 ***************************************************************************/

void FAR InvalidLink()
{   

   if (!hwndProp)
   {
      FARPROC lpfnInvalidLink=NULL;

      lpfnInvalidLink = MakeProcInstance(fnInvalidLink, hInst);
      DialogBox(hInst, "InvalidLink", hwndFrame, lpfnInvalidLink);
      FreeProcInstance(lpfnInvalidLink);
   }
   else
      ErrorMessage(E_FAILED_TO_CONNECT);

}

/****************************************************************************
 *  fnABout()
 *
 *  About box dialog box procedure.
 ***************************************************************************/

BOOL FAR PASCAL fnInvalidLink(        //- ENTRY: 
   HWND           hDlg,                //- standard windows dialog box
   unsigned       message, 
   WORD           wParam, 
   LONG           lParam 
){

   switch (message) 
   {
      case WM_INITDIALOG:
         return (TRUE);

      case WM_COMMAND:
         if (wParam == IDD_CHANGE)
            LinkProperties();   
         EndDialog(hDlg, TRUE);
         return (TRUE);
    }
    return (FALSE);

}

/****************************************************************************
 *  AboutBox()
 *
 *  Show the About Box dialog.
 ***************************************************************************/

void FAR AboutBox()            
{     
   FARPROC lpfnProcAbout=NULL;

   lpfnProcAbout = MakeProcInstance(fnAbout, hInst);
   DialogBox(hInst, "AboutBox", hwndFrame, lpfnProcAbout);
   FreeProcInstance(lpfnProcAbout);

}

/****************************************************************************
 *  fnABout()
 *
 *  About box dialog box procedure.
 ***************************************************************************/

BOOL FAR PASCAL fnAbout(               //- ENTRY: 
   HWND           hDlg,                //- standard windows dialog box
   unsigned       message, 
   WORD           wParam, 
   LONG           lParam 
){

   switch (message) 
   {
      case WM_INITDIALOG:
         return (TRUE);

      case WM_COMMAND:
         if (wParam == IDOK || wParam == IDCANCEL) 
         {
            EndDialog(hDlg, TRUE);
            return (TRUE);
         }
         break;
    }
    return (FALSE);

}


 
/***************************************************************************
 * RetryMessage()
 *
 * give the user the chance to abort when a server is in retry case.
 *
 * Returns BOOL - TRUE if user chooses to cancel
 **************************************************************************/

void FAR RetryMessage (                //- ENTRY:
   APPITEMPTR     paItem,              //- application item pointer
   LONG           lParam
){ 
   RETRYPTR    pRetry;
   LONG	      objectType;
   HANDLE	   hData;
   static char szServerName[KEYNAMESIZE];
   HWND        hwnd;                   //- window handle
   FARPROC     lpfn;                   //- pointer to far

   if (IsWindow(hwndProp))
      hwnd = hwndProp;
   else if (IsWindow(hwndFrame))
      hwnd = hwndFrame; 
   else
      return;                          //- should not happen
                                       //- get the busy servers name
   lstrcpy(szServerName, "server application");

   if (paItem)
   {
      if (!paItem->aServer)
      {
         OleQueryType(paItem->lpObject, &objectType );
         if (OLE_OK == OleGetData(paItem->lpObject, (objectType == OT_LINK ? vcfLink : vcfOwnerLink), &hData ))
         {
            RegGetClassId(szServerName, GlobalLock(hData));
            paItem->aServer = AddAtom(szServerName);
            GlobalUnlock( hData );
         }  
      }
      else
         GetAtomName(paItem->aServer,szServerName,KEYNAMESIZE);
         
   }

   hData = LocalAlloc(LHND,sizeof(RETRYSTRUCT));
   if(!(pRetry = (RETRYPTR)LocalLock(hData)))
     return;

   pRetry->lpserver = (LPSTR)szServerName;
   pRetry->bCancel  = (BOOL)(lParam & RD_CANCEL);
   pRetry->paItem   = paItem;

   lpfn = MakeProcInstance(fnRetry,hInst);
   DialogBoxParam(hInst, "RetryBox", hwnd, lpfn, (LPARAM)MAKELONG(pRetry,0));
   FreeProcInstance((FARPROC)lpfn);

   LocalUnlock(hData);
   LocalFree(hData);

   hRetry = NULL;

}

/****************************************************************************
 *  fnRetry()
 *
 * Retry message box nothing to tricky; however, when a server becomes 
 * unbusy a message is posted to automatically get rid of this dialog.
 * I send a no.
 ***************************************************************************/

BOOL FAR PASCAL fnRetry(               //- ENTRY
   HWND hDlg,                          //- standard dialog entry
   WORD message, 
   WORD wParam, 
   DWORD lParam
){
   static RETRYPTR   pRetry;

   switch (message) 
   {
      case WM_COMMAND:
         switch (wParam) 
         {
               case IDD_SWITCH:
			         DefWindowProc( hDlg, WM_SYSCOMMAND, SC_TASKLIST, NULL);
                  break;

               case IDCANCEL:
                  if (pRetry->paItem)
                     pRetry->paItem->fRetry = FALSE;
                  EndDialog(hDlg, TRUE);
                  return TRUE;

               default:
                   break;
         }
         break;

      case WM_INITDIALOG:
      {
          char       szBuffer[CBMESSAGEMAX];
          char       szText[2*CBMESSAGEMAX];
          
          pRetry = (RETRYPTR)lParam;
          hRetry = hDlg;
       
          LoadString(hInst, IDS_RETRY_TEXT1, szBuffer, CBMESSAGEMAX);
          wsprintf(szText, szBuffer, pRetry->lpserver);
          SetWindowText (GetDlgItem(hDlg, IDD_RETRY_TEXT1), szText);

          LoadString(hInst, IDS_RETRY_TEXT2, szBuffer, CBMESSAGEMAX);
          wsprintf(szText, szBuffer, pRetry->lpserver);
          SetWindowText (GetDlgItem(hDlg, IDD_RETRY_TEXT2), szText);
       
          EnableWindow (GetDlgItem(hDlg, IDCANCEL), pRetry->bCancel);

          return TRUE; 
      }
       
      default:
           break;
   }

   return FALSE;
}