/*
 * Property Sheets
 *
 * Copyright 1998 Francis Beaudet
 * Copyright 1999 Thuy Nguyen
 *
 * TODO:
 *   - Tab order
 *   - Unicode property sheets
 */

#include <string.h>
#include "winbase.h"
#include "commctrl.h"
#include "prsht.h"
#include "dialog.h"
#include "win.h"
#include "winnls.h"
#include "comctl32.h"
#include "debugtools.h"
#include "heap.h"


/******************************************************************************
 * Data structures
 */
typedef struct
{
  WORD dlgVer;
  WORD signature;
  DWORD helpID;
  DWORD exStyle;
  DWORD style;
} MyDLGTEMPLATEEX;

typedef struct tagPropPageInfo
{
  HPROPSHEETPAGE hpage; /* to keep track of pages not passed to PropertySheet */
  HWND hwndPage;
  BOOL isDirty;
  LPCWSTR pszText;
  BOOL hasHelp;
  BOOL useCallback;
  BOOL hasIcon;
} PropPageInfo;

typedef struct tagPropSheetInfo
{
  HWND hwnd;
  PROPSHEETHEADERA ppshheader;
  LPSTR strPropertiesFor;
  int nPages;
  int active_page;
  BOOL isModeless;
  BOOL hasHelp;
  BOOL hasApply;
  BOOL useCallback;
  BOOL restartWindows;
  BOOL rebootSystem;
  BOOL activeValid;
  PropPageInfo* proppage;
  int x;
  int y;
  int width;
  int height;
  HIMAGELIST hImageList;
} PropSheetInfo;

typedef struct
{
  int x;
  int y;
} PADDING_INFO;

/******************************************************************************
 * Defines and global variables
 */

const char * PropSheetInfoStr = "PropertySheetInfo";

#define MAX_CAPTION_LENGTH 255
#define MAX_TABTEXT_LENGTH 255
#define MAX_BUTTONTEXT_LENGTH 64

/******************************************************************************
 * Prototypes
 */
static BOOL PROPSHEET_CreateDialog(PropSheetInfo* psInfo);
static BOOL PROPSHEET_SizeMismatch(HWND hwndDlg, PropSheetInfo* psInfo);
static BOOL PROPSHEET_AdjustSize(HWND hwndDlg, PropSheetInfo* psInfo);
static BOOL PROPSHEET_AdjustButtons(HWND hwndParent, PropSheetInfo* psInfo);
static BOOL PROPSHEET_CollectSheetInfo(LPCPROPSHEETHEADERA lppsh,
                                       PropSheetInfo * psInfo);
static BOOL PROPSHEET_CollectPageInfo(LPCPROPSHEETPAGEA lppsp,
                                      PropSheetInfo * psInfo,
                                      int index);
static BOOL PROPSHEET_CreateTabControl(HWND hwndParent,
                                       PropSheetInfo * psInfo);
static int PROPSHEET_CreatePage(HWND hwndParent, int index,
                                const PropSheetInfo * psInfo,
                                LPCPROPSHEETPAGEA ppshpage);
static BOOL PROPSHEET_ShowPage(HWND hwndDlg, int index, PropSheetInfo * psInfo);
static PADDING_INFO PROPSHEET_GetPaddingInfo(HWND hwndDlg);
static BOOL PROPSHEET_Back(HWND hwndDlg);
static BOOL PROPSHEET_Next(HWND hwndDlg);
static BOOL PROPSHEET_Finish(HWND hwndDlg);
static BOOL PROPSHEET_Apply(HWND hwndDlg, LPARAM lParam);
static void PROPSHEET_Cancel(HWND hwndDlg, LPARAM lParam);
static void PROPSHEET_Help(HWND hwndDlg);
static void PROPSHEET_Changed(HWND hwndDlg, HWND hwndDirtyPage);
static void PROPSHEET_UnChanged(HWND hwndDlg, HWND hwndCleanPage);
static void PROPSHEET_PressButton(HWND hwndDlg, int buttonID);
static void PROPSHEET_SetFinishTextA(HWND hwndDlg, LPCSTR lpszText);
static void PROPSHEET_SetTitleA(HWND hwndDlg, DWORD dwStyle, LPCSTR lpszText);
static BOOL PROPSHEET_CanSetCurSel(HWND hwndDlg);
static BOOL PROPSHEET_SetCurSel(HWND hwndDlg,
                                int index,
                                HPROPSHEETPAGE hpage);
static LRESULT PROPSHEET_QuerySiblings(HWND hwndDlg,
                                       WPARAM wParam, LPARAM lParam);
static BOOL PROPSHEET_AddPage(HWND hwndDlg,
                              HPROPSHEETPAGE hpage);

static BOOL PROPSHEET_RemovePage(HWND hwndDlg,
                                 int index,
                                 HPROPSHEETPAGE hpage);
static void PROPSHEET_CleanUp();
static int PROPSHEET_GetPageIndex(HPROPSHEETPAGE hpage, PropSheetInfo* psInfo);
static void PROPSHEET_SetWizButtons(HWND hwndDlg, DWORD dwFlags);
static PADDING_INFO PROPSHEET_GetPaddingInfoWizard(HWND hwndDlg, const PropSheetInfo* psInfo);
static BOOL PROPSHEET_IsDialogMessage(HWND hwnd, LPMSG lpMsg);
static INT PROPSHEET_DoDialogBox( HWND hwnd, HWND owner);

BOOL WINAPI
PROPSHEET_DialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

DEFAULT_DEBUG_CHANNEL(propsheet)

/******************************************************************************
 *            PROPSHEET_CollectSheetInfo
 *
 * Collect relevant data.
 */
static BOOL PROPSHEET_CollectSheetInfo(LPCPROPSHEETHEADERA lppsh,
                                       PropSheetInfo * psInfo)
{
  DWORD dwSize = min(lppsh->dwSize,sizeof(PROPSHEETHEADERA));
  DWORD dwFlags = lppsh->dwFlags;

  psInfo->hasHelp = dwFlags & PSH_HASHELP;
  psInfo->hasApply = !(dwFlags & PSH_NOAPPLYNOW);
  psInfo->useCallback = dwFlags & PSH_USECALLBACK;
  psInfo->isModeless = dwFlags & PSH_MODELESS;

  memcpy(&psInfo->ppshheader,lppsh,dwSize);

  if (HIWORD(lppsh->pszCaption))
     psInfo->ppshheader.pszCaption = HEAP_strdupA( GetProcessHeap(),
                                                 0, lppsh->pszCaption );

  psInfo->nPages = lppsh->nPages;

  if (dwFlags & PSH_USEPSTARTPAGE)
  {
    TRACE("PSH_USEPSTARTPAGE is on");
    psInfo->active_page = 0;
  }
  else
    psInfo->active_page = lppsh->u2.nStartPage;

  if (psInfo->active_page < 0 || psInfo->active_page >= psInfo->nPages)
     psInfo->active_page = 0;

  psInfo->restartWindows = FALSE;
  psInfo->rebootSystem = FALSE;
  psInfo->hImageList = 0;
  psInfo->activeValid = FALSE;

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_CollectPageInfo
 *
 * Collect property sheet data.
 * With code taken from DIALOG_ParseTemplate32.
 */
BOOL PROPSHEET_CollectPageInfo(LPCPROPSHEETPAGEA lppsp,
                               PropSheetInfo * psInfo,
                               int index)
{
  DLGTEMPLATE* pTemplate;
  const WORD*  p;
  DWORD dwFlags;
  int width, height;

  psInfo->proppage[index].hpage = (HPROPSHEETPAGE)lppsp;
  psInfo->proppage[index].hwndPage = 0;
  psInfo->proppage[index].isDirty = FALSE;

  /*
   * Process property page flags.
   */
  dwFlags = lppsp->dwFlags;
  psInfo->proppage[index].useCallback = dwFlags & PSP_USECALLBACK;
  psInfo->proppage[index].hasHelp = dwFlags & PSP_HASHELP;
  psInfo->proppage[index].hasIcon = dwFlags & (PSP_USEHICON | PSP_USEICONID);

  /* as soon as we have a page with the help flag, set the sheet flag on */
  if (psInfo->proppage[index].hasHelp)
    psInfo->hasHelp = TRUE;

  /*
   * Process page template.
   */
  if (dwFlags & PSP_DLGINDIRECT)
    pTemplate = (DLGTEMPLATE*)lppsp->u.pResource;
  else
  {
    HRSRC hResource = FindResourceA(lppsp->hInstance,
                                    lppsp->u.pszTemplate,
                                    RT_DIALOGA);
    HGLOBAL hTemplate = LoadResource(lppsp->hInstance,
                                     hResource);
    pTemplate = (LPDLGTEMPLATEA)LockResource(hTemplate);
  }

  /*
   * Extract the size of the page and the caption.
   */
  if (!pTemplate)
      return FALSE;

  p = (const WORD *)pTemplate;

  if (((MyDLGTEMPLATEEX*)pTemplate)->signature == 0xFFFF)
  {
    /* DIALOGEX template */

    p++;       /* dlgVer    */
    p++;       /* signature */
    p += 2;    /* help ID   */
    p += 2;    /* ext style */
    p += 2;    /* style     */
  }
  else
  {
    /* DIALOG template */

    p += 2;    /* style     */
    p += 2;    /* ext style */
  }

  p++;    /* nb items */
  p++;    /*   x      */
  p++;    /*   y      */
  width  = (WORD)*p; p++;
  height = (WORD)*p; p++;

  /* remember the largest width and height */
  if (width > psInfo->width)
    psInfo->width = width;

  if (height > psInfo->height)
    psInfo->height = height;

  /* menu */
  switch ((WORD)*p)
  {
    case 0x0000:
      p++;
      break;
    case 0xffff:
      p += 2;
      break;
    default:
      p += lstrlenW( (LPCWSTR)p ) + 1;
      break;
  } 

  /* class */
  switch ((WORD)*p)
  {
    case 0x0000:
      p++;
      break;
    case 0xffff:
      p += 2;
      break;
    default:
      p += lstrlenW( (LPCWSTR)p ) + 1;
      break;
  }

  /* Extract the caption */
  psInfo->proppage[index].pszText = (LPCWSTR)p;
  TRACE("Tab %d %s\n",index,debugstr_w((LPCWSTR)p));
  p += lstrlenW((LPCWSTR)p) + 1;

  if (dwFlags & PSP_USETITLE)
  {
    if ( !HIWORD( lppsp->pszTitle ) )
    {
      char szTitle[256];
      
      if ( !LoadStringA( lppsp->hInstance, (UINT) lppsp->pszTitle, szTitle, 256 ) )
	return FALSE;
      
      psInfo->proppage[index].pszText = HEAP_strdupAtoW( GetProcessHeap(),
							 0, szTitle );
    }
    else
      psInfo->proppage[index].pszText = HEAP_strdupAtoW(GetProcessHeap(),
							0,
							lppsp->pszTitle);
  }

  /*
   * Build the image list for icons
   */
  if ((dwFlags & PSP_USEHICON) || (dwFlags & PSP_USEICONID)) 
  {
    HICON hIcon;
    int icon_cx = GetSystemMetrics(SM_CXSMICON);
    int icon_cy = GetSystemMetrics(SM_CYSMICON);

    if (dwFlags & PSP_USEICONID)
      hIcon = LoadImageA(lppsp->hInstance, lppsp->u2.pszIcon, IMAGE_ICON, 
                         icon_cx, icon_cy, LR_DEFAULTCOLOR);
    else
      hIcon = lppsp->u2.hIcon;

    if ( hIcon )
    {
      if (psInfo->hImageList == 0 )
	psInfo->hImageList = ImageList_Create(icon_cx, icon_cy, ILC_COLOR, 1, 1);

      ImageList_AddIcon(psInfo->hImageList, hIcon);
    }

  }

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_DoDialogBox
 *
 * Copied from windows/dialog.c:DIALOG_DoDialogBox
 */
static INT PROPSHEET_DoDialogBox( HWND hwnd, HWND owner)
{
   WND * wndPtr;
   DIALOGINFO * dlgInfo;
   MSG msg;
   INT retval;

     /* Owner must be a top-level window */
   owner = WIN_GetTopParent( owner );
   if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return -1;
   dlgInfo = (DIALOGINFO *)wndPtr->wExtra;

   if (!(dlgInfo->flags & DF_END)) /* was EndDialog called in WM_INITDIALOG ? */
   {
       EnableWindow( owner, FALSE );
       ShowWindow( hwnd, SW_SHOW );
       while (GetMessageA(&msg, 0, 0, 0))
       {
           if (!PROPSHEET_IsDialogMessage( hwnd, &msg))
           {
               TranslateMessage( &msg );
               DispatchMessageA( &msg );
           }
           if (dlgInfo->flags & DF_END) break;
       }
       EnableWindow( owner, TRUE );
   }
   retval = dlgInfo->idResult; 
   WIN_ReleaseWndPtr(wndPtr);
   DestroyWindow( hwnd );
   return retval;
}


/******************************************************************************
 *            PROPSHEET_CreateDialog
 *
 * Creates the actual property sheet.
 */
BOOL PROPSHEET_CreateDialog(PropSheetInfo* psInfo)
{
  LRESULT ret;
  LPCVOID template;
  LPVOID temp = 0;
  HRSRC hRes;
  DWORD resSize;
  WORD resID = IDD_PROPSHEET;

  if (psInfo->ppshheader.dwFlags & PSH_WIZARD)
    resID = IDD_WIZARD;

  if(!(hRes = FindResourceA(COMCTL32_hModule,
                            MAKEINTRESOURCEA(resID),
                            RT_DIALOGA)))
    return FALSE;

  if(!(template = (LPVOID)LoadResource(COMCTL32_hModule, hRes)))
    return FALSE;

  /*
   * Make a copy of the dialog template.
   */
  resSize = SizeofResource(COMCTL32_hModule, hRes);

  temp = COMCTL32_Alloc(resSize);

  if (!temp)
    return FALSE;

  memcpy(temp, template, resSize);

  if (psInfo->useCallback)
    (*(psInfo->ppshheader.pfnCallback))(0, PSCB_PRECREATE, (LPARAM)temp);

  ret = CreateDialogIndirectParamA(psInfo->ppshheader.hInstance,
                                     (LPDLGTEMPLATEA) temp,
                                     psInfo->ppshheader.hwndParent,
                                     (DLGPROC) PROPSHEET_DialogProc,
                                     (LPARAM)psInfo);

  if (!(psInfo->ppshheader.dwFlags & PSH_MODELESS))
     ret = PROPSHEET_DoDialogBox((HWND)ret, psInfo->ppshheader.hwndParent);
 
  COMCTL32_Free(temp);

  return ret;
}

/******************************************************************************
 *            PROPSHEET_SizeMismatch
 * 
 *     Verify that the tab control and the "largest" property sheet page dlg. template
 *     match in size.
 */
static BOOL PROPSHEET_SizeMismatch(HWND hwndDlg, PropSheetInfo* psInfo)
{
  HWND hwndTabCtrl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  RECT rcOrigTab, rcPage;

  /*
   * Original tab size.
   */
  GetClientRect(hwndTabCtrl, &rcOrigTab);
  TRACE("orig tab %d %d %d %d\n", rcOrigTab.left, rcOrigTab.top,
        rcOrigTab.right, rcOrigTab.bottom);

  /*
   * Biggest page size.
   */
  rcPage.left   = psInfo->x;
  rcPage.top    = psInfo->y;
  rcPage.right  = psInfo->width;
  rcPage.bottom = psInfo->height;

  MapDialogRect(hwndDlg, &rcPage);
  TRACE("biggest page %d %d %d %d\n", rcPage.left, rcPage.top,
        rcPage.right, rcPage.bottom);

  if ( (rcPage.right - rcPage.left) != (rcOrigTab.right - rcOrigTab.left) )
    return TRUE;
  if ( (rcPage.bottom - rcPage.top) != (rcOrigTab.bottom - rcOrigTab.top) )
    return TRUE;

  return FALSE;
}

/******************************************************************************
 *            PROPSHEET_IsTooSmallWizard
 *
 * Verify that the default property sheet is big enough.
 */
static BOOL PROPSHEET_IsTooSmallWizard(HWND hwndDlg, PropSheetInfo* psInfo)
{
  RECT rcSheetRect, rcPage, rcLine, rcSheetClient;
  HWND hwndLine = GetDlgItem(hwndDlg, IDC_SUNKEN_LINE);
  PADDING_INFO padding = PROPSHEET_GetPaddingInfoWizard(hwndDlg, psInfo);

  GetClientRect(hwndDlg, &rcSheetClient);
  GetWindowRect(hwndDlg, &rcSheetRect);
  GetWindowRect(hwndLine, &rcLine);

  /* Remove the space below the sunken line */
  rcSheetClient.bottom -= (rcSheetRect.bottom - rcLine.top);

  /* Remove the buffer zone all around the edge */
  rcSheetClient.bottom -= (padding.y * 2);
  rcSheetClient.right -= (padding.x * 2);

  /*
   * Biggest page size.
   */
  rcPage.left   = psInfo->x;
  rcPage.top    = psInfo->y;
  rcPage.right  = psInfo->width;
  rcPage.bottom = psInfo->height;

  MapDialogRect(hwndDlg, &rcPage);
  TRACE("biggest page %d %d %d %d\n", rcPage.left, rcPage.top,
        rcPage.right, rcPage.bottom);

  if (rcPage.right > rcSheetClient.right)
    return TRUE;

  if (rcPage.bottom > rcSheetClient.bottom)
    return TRUE;

  return FALSE;
}

/******************************************************************************
 *            PROPSHEET_AdjustSize
 *
 * Resizes the property sheet and the tab control to fit the largest page.
 */
static BOOL PROPSHEET_AdjustSize(HWND hwndDlg, PropSheetInfo* psInfo)
{
  HWND hwndTabCtrl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  HWND hwndButton = GetDlgItem(hwndDlg, IDOK);
  RECT rc,tabRect;
  int tabOffsetX, tabOffsetY, buttonHeight;
  PADDING_INFO padding = PROPSHEET_GetPaddingInfo(hwndDlg);
  WND * wndPtr = WIN_FindWndPtr( hwndDlg );
  DIALOGINFO * dlgInfo = (DIALOGINFO *)wndPtr->wExtra;

  /* Get the height of buttons */
  GetClientRect(hwndButton, &rc);
  buttonHeight = rc.bottom;

  /*
   * Biggest page size.
   */
  rc.left   = psInfo->x;
  rc.top    = psInfo->y;
  rc.right  = psInfo->width;
  rc.bottom = psInfo->height;

  MapDialogRect(hwndDlg, &rc);

  /*
   * Resize the tab control.
   */
  GetClientRect(hwndTabCtrl,&tabRect);

  SendMessageA(hwndTabCtrl, TCM_ADJUSTRECT, FALSE, (LPARAM)&tabRect);

  if ((rc.bottom - rc.top) < (tabRect.bottom - tabRect.top))
  {
      rc.bottom = rc.top + tabRect.bottom - tabRect.top;
      psInfo->height = MulDiv((rc.bottom - rc.top),8,dlgInfo->yBaseUnit);
  }
  
  if ((rc.right - rc.left) < (tabRect.right - tabRect.left))
  {
      rc.right = rc.left + tabRect.right - tabRect.left;
      psInfo->width  = MulDiv((rc.right - rc.left),4,dlgInfo->xBaseUnit);
  }

  SendMessageA(hwndTabCtrl, TCM_ADJUSTRECT, TRUE, (LPARAM)&rc);

  tabOffsetX = -(rc.left);
  tabOffsetY = -(rc.top);

  rc.right -= rc.left;
  rc.bottom -= rc.top;
  SetWindowPos(hwndTabCtrl, 0, 0, 0, rc.right, rc.bottom,
               SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);

  GetClientRect(hwndTabCtrl, &rc);

  TRACE("tab client rc %d %d %d %d\n",
        rc.left, rc.top, rc.right, rc.bottom);

  rc.right += ((padding.x * 2) + tabOffsetX);
  rc.bottom += (buttonHeight + (3 * padding.y) + tabOffsetY);

  /*
   * Resize the property sheet.
   */
  SetWindowPos(hwndDlg, 0, 0, 0, rc.right, rc.bottom,
               SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);

  WIN_ReleaseWndPtr(wndPtr);
  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_AdjustSizeWizard
 *
 * Resizes the property sheet to fit the largest page.
 */
static BOOL PROPSHEET_AdjustSizeWizard(HWND hwndDlg, PropSheetInfo* psInfo)
{
  HWND hwndButton = GetDlgItem(hwndDlg, IDCANCEL);
  HWND hwndLine = GetDlgItem(hwndDlg, IDC_SUNKEN_LINE);
  HWND hwndTabCtrl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  RECT rc,tabRect;
  int buttonHeight, lineHeight;
  PADDING_INFO padding = PROPSHEET_GetPaddingInfoWizard(hwndDlg, psInfo);
  WND * wndPtr = WIN_FindWndPtr( hwndDlg );
  DIALOGINFO * dlgInfo = (DIALOGINFO *)wndPtr->wExtra;

  /* Get the height of buttons */
  GetClientRect(hwndButton, &rc);
  buttonHeight = rc.bottom;

  GetClientRect(hwndLine, &rc);
  lineHeight = rc.bottom;

  /*
   * Biggest page size.
   */
  rc.left   = psInfo->x;
  rc.top    = psInfo->y;
  rc.right  = psInfo->width;
  rc.bottom = psInfo->height;

  MapDialogRect(hwndDlg, &rc);

  GetClientRect(hwndTabCtrl,&tabRect);

  if ((rc.bottom - rc.top) < (tabRect.bottom - tabRect.top))
  {
      rc.bottom = rc.top + tabRect.bottom - tabRect.top;
      psInfo->height = MulDiv((rc.bottom - rc.top), 8, dlgInfo->yBaseUnit);
  }
  
  if ((rc.right - rc.left) < (tabRect.right - tabRect.left))
  {
      rc.right = rc.left + tabRect.right - tabRect.left;
      psInfo->width  = MulDiv((rc.right - rc.left), 4, dlgInfo->xBaseUnit);
  }

  TRACE("Biggest page %d %d %d %d\n", rc.left, rc.top, rc.right, rc.bottom);

  /* Make room */
  rc.right += (padding.x * 2);
  rc.bottom += (buttonHeight + (5 * padding.y) + lineHeight);

  /*
   * Resize the property sheet.
   */
  SetWindowPos(hwndDlg, 0, 0, 0, rc.right, rc.bottom,
               SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);

  WIN_ReleaseWndPtr(wndPtr);
  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_AdjustButtons
 *
 * Adjusts the buttons' positions.
 */
static BOOL PROPSHEET_AdjustButtons(HWND hwndParent, PropSheetInfo* psInfo)
{
  HWND hwndButton = GetDlgItem(hwndParent, IDOK);
  RECT rcSheet;
  int x, y;
  int num_buttons = 2;
  int buttonWidth, buttonHeight;
  PADDING_INFO padding = PROPSHEET_GetPaddingInfo(hwndParent);

  if (psInfo->hasApply)
    num_buttons++;

  if (psInfo->hasHelp)
    num_buttons++;

  /*
   * Obtain the size of the buttons.
   */
  GetClientRect(hwndButton, &rcSheet);
  buttonWidth = rcSheet.right;
  buttonHeight = rcSheet.bottom;

  /*
   * Get the size of the property sheet.
   */ 
  GetClientRect(hwndParent, &rcSheet);

  /* 
   * All buttons will be at this y coordinate.
   */
  y = rcSheet.bottom - (padding.y + buttonHeight);

  /*
   * Position OK button.
   */
  hwndButton = GetDlgItem(hwndParent, IDOK);

  x = rcSheet.right - ((padding.x + buttonWidth) * num_buttons);

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  /*
   * Position Cancel button.
   */
  hwndButton = GetDlgItem(hwndParent, IDCANCEL);

  x = rcSheet.right - ((padding.x + buttonWidth) * (num_buttons - 1));

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  /*
   * Position Apply button.
   */
  hwndButton = GetDlgItem(hwndParent, IDC_APPLY_BUTTON);

  if (psInfo->hasApply)
  {
    if (psInfo->hasHelp)
      x = rcSheet.right - ((padding.x + buttonWidth) * 2);
    else
      x = rcSheet.right - (padding.x + buttonWidth);
  
    SetWindowPos(hwndButton, 0, x, y, 0, 0,
                 SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

    EnableWindow(hwndButton, FALSE);
  }
  else
    ShowWindow(hwndButton, SW_HIDE);

  /*
   * Position Help button.
   */
  hwndButton = GetDlgItem(hwndParent, IDHELP);

  if (psInfo->hasHelp)
  {
    x = rcSheet.right - (padding.x + buttonWidth);
  
    SetWindowPos(hwndButton, 0, x, y, 0, 0,
                 SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
  }
  else
    ShowWindow(hwndButton, SW_HIDE);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_AdjustButtonsWizard
 *
 * Adjusts the buttons' positions.
 */
static BOOL PROPSHEET_AdjustButtonsWizard(HWND hwndParent,
                                          PropSheetInfo* psInfo)
{
  HWND hwndButton = GetDlgItem(hwndParent, IDCANCEL);
  HWND hwndLine = GetDlgItem(hwndParent, IDC_SUNKEN_LINE);
  RECT rcSheet;
  int x, y;
  int num_buttons = 3;
  int buttonWidth, buttonHeight, lineHeight, lineWidth;
  PADDING_INFO padding = PROPSHEET_GetPaddingInfoWizard(hwndParent, psInfo);

  if (psInfo->hasHelp)
    num_buttons++;

  /*
   * Obtain the size of the buttons.
   */
  GetClientRect(hwndButton, &rcSheet);
  buttonWidth = rcSheet.right;
  buttonHeight = rcSheet.bottom;

  GetClientRect(hwndLine, &rcSheet);
  lineHeight = rcSheet.bottom;

  /*
   * Get the size of the property sheet.
   */
  GetClientRect(hwndParent, &rcSheet);

  /*
   * All buttons will be at this y coordinate.
   */
  y = rcSheet.bottom - (padding.y + buttonHeight);

  /*
   * Position the Next and the Finish buttons.
   */
  hwndButton = GetDlgItem(hwndParent, IDC_NEXT_BUTTON);

  x = rcSheet.right - ((padding.x + buttonWidth) * (num_buttons - 1));

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  hwndButton = GetDlgItem(hwndParent, IDC_FINISH_BUTTON);

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  ShowWindow(hwndButton, SW_HIDE);

  /*
   * Position the Back button.
   */
  hwndButton = GetDlgItem(hwndParent, IDC_BACK_BUTTON);

  x -= buttonWidth;

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  /*
   * Position the Cancel button.
   */
  hwndButton = GetDlgItem(hwndParent, IDCANCEL);

  x = rcSheet.right - ((padding.x + buttonWidth) * (num_buttons - 2));

  SetWindowPos(hwndButton, 0, x, y, 0, 0,
               SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);

  /*
   * Position Help button.
   */
  hwndButton = GetDlgItem(hwndParent, IDHELP);

  if (psInfo->hasHelp)
  {
    x = rcSheet.right - (padding.x + buttonWidth);

    SetWindowPos(hwndButton, 0, x, y, 0, 0,
                 SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
  }
  else
    ShowWindow(hwndButton, SW_HIDE);

  /*
   * Position and resize the sunken line.
   */
  x = padding.x;
  y = rcSheet.bottom - ((padding.y * 2) + buttonHeight + lineHeight);

  GetClientRect(hwndParent, &rcSheet);
  lineWidth = rcSheet.right - (padding.x * 2);

  SetWindowPos(hwndLine, 0, x, y, lineWidth, 2,
               SWP_NOZORDER | SWP_NOACTIVATE);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_GetPaddingInfo
 *
 * Returns the layout information.
 */
static PADDING_INFO PROPSHEET_GetPaddingInfo(HWND hwndDlg)
{
  HWND hwndTab = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  RECT rcTab;
  POINT tl;
  PADDING_INFO padding;

  GetWindowRect(hwndTab, &rcTab);

  tl.x = rcTab.left;
  tl.y = rcTab.top;

  ScreenToClient(hwndDlg, &tl);

  padding.x = tl.x;
  padding.y = tl.y;

  return padding;
}

/******************************************************************************
 *            PROPSHEET_GetPaddingInfoWizard
 *
 * Returns the layout information.
 * Vertical spacing is the distance between the line and the buttons.
 * Do NOT use the Help button to gather padding information when it isn't mapped
 * (PSH_HASHELP), as app writers aren't forced to supply correct coordinates
 * for it in this case !
 * FIXME: I'm not sure about any other coordinate problems with these evil
 * buttons. Fix it in case additional problems appear or maybe calculate
 * a padding in a completely different way, as this is somewhat messy.
 */
static PADDING_INFO PROPSHEET_GetPaddingInfoWizard(HWND hwndDlg, const PropSheetInfo*
 psInfo)
{
  PADDING_INFO padding;
  RECT rc;
  HWND hwndControl;
  INT idButton;
  POINT ptButton, ptLine;

  if (psInfo->hasHelp)
  {
	idButton = IDHELP;
  }
  else
  {
    if (psInfo->ppshheader.dwFlags & PSH_WIZARD)
    {
	idButton = IDC_NEXT_BUTTON;
    }
    else
    {
	/* hopefully this is ok */
	idButton = IDCANCEL;
    }
  }
  
  hwndControl = GetDlgItem(hwndDlg, idButton);
  GetWindowRect(hwndControl, &rc);

  ptButton.x = rc.left;
  ptButton.y = rc.top;

  ScreenToClient(hwndDlg, &ptButton);

  /* Line */
  hwndControl = GetDlgItem(hwndDlg, IDC_SUNKEN_LINE);
  GetWindowRect(hwndControl, &rc);

  ptLine.x = 0;
  ptLine.y = rc.bottom;

  ScreenToClient(hwndDlg, &ptLine);

  padding.y = ptButton.y - ptLine.y;

  if (padding.y < 0)
	  ERR("padding negative ! Please report this !\n");

  /* this is most probably not correct, but the best we have now */
  padding.x = padding.y;
  return padding;
}

/******************************************************************************
 *            PROPSHEET_CreateTabControl
 *
 * Insert the tabs in the tab control.
 */
static BOOL PROPSHEET_CreateTabControl(HWND hwndParent,
                                       PropSheetInfo * psInfo)
{
  HWND hwndTabCtrl = GetDlgItem(hwndParent, IDC_TABCONTROL);
  TCITEMA item;
  int i, nTabs;
  int iImage = 0;
  char tabtext[MAX_TABTEXT_LENGTH] = "Tab text";

  item.mask = TCIF_TEXT;
  item.pszText = tabtext;
  item.cchTextMax = MAX_TABTEXT_LENGTH;

  nTabs = psInfo->nPages;

  /*
   * Set the image list for icons.
   */
  if (psInfo->hImageList)
  {
    SendMessageA(hwndTabCtrl, TCM_SETIMAGELIST, 0, (LPARAM)psInfo->hImageList);
  }

  for (i = 0; i < nTabs; i++)
  {
    if ( psInfo->proppage[i].hasIcon )
    {
      item.mask |= TCIF_IMAGE;
      item.iImage = iImage++;
    }
    else
    {
      item.mask &= ~TCIF_IMAGE;
    }

    WideCharToMultiByte(CP_ACP, 0,
                        (LPCWSTR)psInfo->proppage[i].pszText,
                        -1, tabtext, MAX_TABTEXT_LENGTH, NULL, NULL);

    SendMessageA(hwndTabCtrl, TCM_INSERTITEMA, (WPARAM)i, (LPARAM)&item);
  }

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_CreatePage
 *
 * Creates a page.
 */
static int PROPSHEET_CreatePage(HWND hwndParent,
                                int index,
                                const PropSheetInfo * psInfo,
                                LPCPROPSHEETPAGEA ppshpage)
{
  DLGTEMPLATE* pTemplate;
  HWND hwndPage;
  RECT rc;
  PropPageInfo* ppInfo = psInfo->proppage;
  PADDING_INFO padding;
  UINT pageWidth,pageHeight;

  TRACE("index %d\n", index);

  if (ppshpage->dwFlags & PSP_DLGINDIRECT)
    pTemplate = (DLGTEMPLATE*)ppshpage->u.pResource;
  else
  {
    HRSRC hResource = FindResourceA(ppshpage->hInstance,
                                    ppshpage->u.pszTemplate,
                                    RT_DIALOGA);
    HGLOBAL hTemplate = LoadResource(ppshpage->hInstance, hResource);
    pTemplate = (LPDLGTEMPLATEA)LockResource(hTemplate);
  }

  if (((MyDLGTEMPLATEEX*)pTemplate)->signature == 0xFFFF)
  {
    ((MyDLGTEMPLATEEX*)pTemplate)->style |= WS_CHILD | DS_CONTROL;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~DS_MODALFRAME;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~WS_CAPTION;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~WS_SYSMENU;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~WS_POPUP;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~WS_DISABLED;
    ((MyDLGTEMPLATEEX*)pTemplate)->style &= ~WS_VISIBLE;
  }
  else
  {
    pTemplate->style |= WS_CHILD | DS_CONTROL;
    pTemplate->style &= ~DS_MODALFRAME;
    pTemplate->style &= ~WS_CAPTION;
    pTemplate->style &= ~WS_SYSMENU;
    pTemplate->style &= ~WS_POPUP;
    pTemplate->style &= ~WS_DISABLED;
    pTemplate->style &= ~WS_VISIBLE;
  }

  if (psInfo->proppage[index].useCallback)
    (*(ppshpage->pfnCallback))(hwndParent,
                               PSPCB_CREATE,
                               (LPPROPSHEETPAGEA)ppshpage);

  hwndPage = CreateDialogIndirectParamA(ppshpage->hInstance,
					pTemplate,
					hwndParent,
					ppshpage->pfnDlgProc,
					(LPARAM)ppshpage);

  ppInfo[index].hwndPage = hwndPage;

  rc.left = psInfo->x;
  rc.top = psInfo->y;
  rc.right = psInfo->width;
  rc.bottom = psInfo->height;

  MapDialogRect(hwndParent, &rc);

  pageWidth = rc.right - rc.left;
  pageHeight = rc.bottom - rc.top;

  if (psInfo->ppshheader.dwFlags & PSH_WIZARD)
    padding = PROPSHEET_GetPaddingInfoWizard(hwndParent, psInfo);
  else
  {
    /*
     * Ask the Tab control to fit this page in.
     */

    HWND hwndTabCtrl = GetDlgItem(hwndParent, IDC_TABCONTROL);
    SendMessageA(hwndTabCtrl, TCM_ADJUSTRECT, FALSE, (LPARAM)&rc);
    padding = PROPSHEET_GetPaddingInfo(hwndParent);
  }

  SetWindowPos(hwndPage, HWND_TOP,
               rc.left + padding.x,
               rc.top + padding.y,
               pageWidth, pageHeight, 0);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_ShowPage
 *
 * Displays or creates the specified page.
 */
static BOOL PROPSHEET_ShowPage(HWND hwndDlg, int index, PropSheetInfo * psInfo)
{
  if (index == psInfo->active_page)
    {
      if (GetTopWindow(hwndDlg) != psInfo->proppage[index].hwndPage)
          SetWindowPos(psInfo->proppage[index].hwndPage, HWND_TOP, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);
    return TRUE;
    }

  if (psInfo->proppage[index].hwndPage == 0)
  {
     LPCPROPSHEETPAGEA ppshpage;
     PSHNOTIFY psn;

     ppshpage = (LPCPROPSHEETPAGEA)psInfo->proppage[index].hpage;
     PROPSHEET_CreatePage(hwndDlg, index, psInfo, ppshpage);

     psn.hdr.hwndFrom = hwndDlg;
     psn.hdr.code     = PSN_SETACTIVE;
     psn.hdr.idFrom   = 0;
     psn.lParam       = 0;

     /* Send the notification before showing the page. */
     SendMessageA(psInfo->proppage[index].hwndPage,
                  WM_NOTIFY, 0, (LPARAM) &psn);

     /*
      * TODO: check return value. 
      */
  }

  if (psInfo->active_page != -1)
     ShowWindow(psInfo->proppage[psInfo->active_page].hwndPage, SW_HIDE);

  ShowWindow(psInfo->proppage[index].hwndPage, SW_SHOW);

  if (!(psInfo->ppshheader.dwFlags & PSH_WIZARD))
  {
     HWND hwndTabCtrl;

     /* Synchronize current selection with tab control */
     hwndTabCtrl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
     SendMessageA(hwndTabCtrl, TCM_SETCURSEL, index, 0);
  }

  psInfo->active_page = index;
  psInfo->activeValid = TRUE;

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_Back
 */
static BOOL PROPSHEET_Back(HWND hwndDlg)
{
  BOOL res;
  PSHNOTIFY psn;
  HWND hwndPage;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if (psInfo->active_page < 0)
     return FALSE;

  psn.hdr.code     = PSN_WIZBACK;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 
  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;

  if (SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn) == -1)
    return FALSE;

  if (psInfo->active_page > 0)
  {
     res = PROPSHEET_CanSetCurSel(hwndDlg);
     if(res != FALSE)
     {
       res = PROPSHEET_SetCurSel(hwndDlg, psInfo->active_page - 1, 0);
     }
  }

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_Next
 */
static BOOL PROPSHEET_Next(HWND hwndDlg)
{
  PSHNOTIFY psn;
  HWND hwndPage;
  LRESULT msgResult = 0;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if (psInfo->active_page < 0)
     return FALSE;

  psn.hdr.code     = PSN_WIZNEXT;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 
  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;

  msgResult = SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);

  TRACE("msg result %ld\n", msgResult);

  if (msgResult == -1)
    return FALSE;

  if(PROPSHEET_CanSetCurSel(hwndDlg) != FALSE)
  {
    PROPSHEET_SetCurSel(hwndDlg, psInfo->active_page + 1, 0);
  }

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_Finish
 */
static BOOL PROPSHEET_Finish(HWND hwndDlg)
{
  PSHNOTIFY psn;
  HWND hwndPage;
  LRESULT msgResult = 0;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if (psInfo->active_page < 0)
     return FALSE;

  psn.hdr.code     = PSN_WIZFINISH;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 
  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;

  msgResult = SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);

  TRACE("msg result %ld\n", msgResult);

  if (msgResult != 0)
    return FALSE;

  if (psInfo->isModeless)
    psInfo->activeValid = FALSE;
  else
    EndDialog(hwndDlg, TRUE);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_Apply
 */
static BOOL PROPSHEET_Apply(HWND hwndDlg, LPARAM lParam)
{
  int i;
  HWND hwndPage;
  PSHNOTIFY psn;
  LRESULT msgResult;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if (psInfo->active_page < 0)
     return FALSE;

  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 

  /*
   * Send PSN_KILLACTIVE to the current page.
   */
  psn.hdr.code = PSN_KILLACTIVE;

  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;

  if (SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn) != FALSE)
    return FALSE;

  /*
   * Send PSN_APPLY to all pages.
   */
  psn.hdr.code = PSN_APPLY;
  psn.lParam   = lParam;
 
  for (i = 0; i < psInfo->nPages; i++)
  {
    hwndPage = psInfo->proppage[i].hwndPage;
    if (hwndPage)
    {
       msgResult = SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);
       if (msgResult == PSNRET_INVALID_NOCHANGEPAGE)
          return FALSE;
    }
  }

  if(lParam)
  {
     psInfo->activeValid = FALSE;
  }
  else if(psInfo->active_page >= 0)
  {
     psn.hdr.code = PSN_SETACTIVE;
     psn.lParam   = 0;
     hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;
     SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);
  }

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_Cancel
 */
static void PROPSHEET_Cancel(HWND hwndDlg, LPARAM lParam)
{
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);
  HWND hwndPage;
  PSHNOTIFY psn;
  int i;

  if (psInfo->active_page < 0)
     return;

  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;
  psn.hdr.code     = PSN_QUERYCANCEL;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 
  if (SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn))
    return;

  psn.hdr.code = PSN_RESET;
  psn.lParam   = lParam;
 
  for (i = 0; i < psInfo->nPages; i++)
  {
    hwndPage = psInfo->proppage[i].hwndPage;

    if (hwndPage)
       SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);
  }

  if (psInfo->isModeless)
  {
     /* makes PSM_GETCURRENTPAGEHWND return NULL */
     psInfo->activeValid = FALSE;
  }
  else
    EndDialog(hwndDlg, FALSE);
}

/******************************************************************************
 *            PROPSHEET_Help
 */
static void PROPSHEET_Help(HWND hwndDlg)
{
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);
  HWND hwndPage;
  PSHNOTIFY psn;

  if (psInfo->active_page < 0)
     return;

  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;
  psn.hdr.code     = PSN_HELP;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;
 
  SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);
}

/******************************************************************************
 *            PROPSHEET_Changed
 */
static void PROPSHEET_Changed(HWND hwndDlg, HWND hwndDirtyPage)
{
  int i;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if (!psInfo) return;
  /*
   * Set the dirty flag of this page.
   */
  for (i = 0; i < psInfo->nPages; i++)
  {
    if (psInfo->proppage[i].hwndPage == hwndDirtyPage)
      psInfo->proppage[i].isDirty = TRUE;
  }

  /*
   * Enable the Apply button.
   */
  if (psInfo->hasApply)
  {
    HWND hwndApplyBtn = GetDlgItem(hwndDlg, IDC_APPLY_BUTTON);

    EnableWindow(hwndApplyBtn, TRUE);
  }
}

/******************************************************************************
 *            PROPSHEET_UnChanged
 */
static void PROPSHEET_UnChanged(HWND hwndDlg, HWND hwndCleanPage)
{
  int i;
  BOOL noPageDirty = TRUE;
  HWND hwndApplyBtn = GetDlgItem(hwndDlg, IDC_APPLY_BUTTON);
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  if ( !psInfo ) return;
  for (i = 0; i < psInfo->nPages; i++)
  {
    /* set the specified page as clean */
    if (psInfo->proppage[i].hwndPage == hwndCleanPage)
      psInfo->proppage[i].isDirty = FALSE;

    /* look to see if there's any dirty pages */
    if (psInfo->proppage[i].isDirty)
      noPageDirty = FALSE;
  }

  /*
   * Disable Apply button.
   */
  if (noPageDirty)
    EnableWindow(hwndApplyBtn, FALSE);
}

/******************************************************************************
 *            PROPSHEET_PressButton
 */
static void PROPSHEET_PressButton(HWND hwndDlg, int buttonID)
{
  switch (buttonID)
  {
    case PSBTN_APPLYNOW:
      SendMessageA(hwndDlg, WM_COMMAND, IDC_APPLY_BUTTON, 0);
      break;
    case PSBTN_BACK:
      PROPSHEET_Back(hwndDlg);
      break;
    case PSBTN_CANCEL:
      SendMessageA(hwndDlg, WM_COMMAND, IDCANCEL, 0);
      break;
    case PSBTN_FINISH:
      PROPSHEET_Finish(hwndDlg);
      break;
    case PSBTN_HELP:
      SendMessageA(hwndDlg, WM_COMMAND, IDHELP, 0);
      break;
    case PSBTN_NEXT:
      PROPSHEET_Next(hwndDlg);
      break;
    case PSBTN_OK:
      SendMessageA(hwndDlg, WM_COMMAND, IDOK, 0);
      break;
    default:
      FIXME("Invalid button index %d\n", buttonID);
  }
}


/*************************************************************************
 * BOOL PROPSHEET_CanSetCurSel [Internal] 
 *
 * Test weither the current page can be changed by sending a PSN_KILLACTIVE
 *
 * PARAMS
 *     hwndDlg        [I] handle to a Dialog hWnd
 *
 * RETURNS
 *     TRUE if Current Selection can change
 *
 * NOTES
 */
static BOOL PROPSHEET_CanSetCurSel(HWND hwndDlg)
{
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);
  HWND hwndPage;
  PSHNOTIFY psn;

  if (!psInfo)
     return FALSE;

  if (psInfo->active_page < 0)
     return TRUE;

  /*
   * Notify the current page.
   */
  hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;
  psn.hdr.code     = PSN_KILLACTIVE;
  psn.hdr.hwndFrom = hwndDlg;
  psn.hdr.idFrom   = 0;
  psn.lParam       = 0;

  return !SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);
}

/******************************************************************************
 *            PROPSHEET_SetCurSel
 */
static BOOL PROPSHEET_SetCurSel(HWND hwndDlg,
                                int index,
                                HPROPSHEETPAGE hpage)
{
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);
  HWND hwndPage;
  HWND hwndHelp  = GetDlgItem(hwndDlg, IDHELP);

  /* hpage takes precedence over index */
  if (hpage != NULL)
    index = PROPSHEET_GetPageIndex(hpage, psInfo);

  if (index < 0 || index >= psInfo->nPages)
  {
    TRACE("Could not find page to select!\n");
    return FALSE;
  }

  hwndPage = psInfo->proppage[index].hwndPage;

  /*
   * Notify the new page if it's already created.
   * If not it will get created and notified in PROPSHEET_ShowPage.
   */
  if (hwndPage)
  {
    int result;
    PSHNOTIFY psn;

    psn.hdr.code     = PSN_SETACTIVE;
    psn.hdr.hwndFrom = hwndDlg;
    psn.hdr.idFrom   = 0;
    psn.lParam       = 0;

    result = SendMessageA(hwndPage, WM_NOTIFY, 0, (LPARAM) &psn);

    /*
     * TODO: check return value. 
     */
  }

  /*
   * Display the new page.
   */
  PROPSHEET_ShowPage(hwndDlg, index, psInfo);

  if (psInfo->proppage[index].hasHelp)
    EnableWindow(hwndHelp, TRUE);
  else
    EnableWindow(hwndHelp, FALSE);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_SetTitleA
 */
static void PROPSHEET_SetTitleA(HWND hwndDlg, DWORD dwStyle, LPCSTR lpszText)
{
  PropSheetInfo*	psInfo = (PropSheetInfo*) GetPropA(hwndDlg, PropSheetInfoStr);
  char 				szTitle[256];

  if (HIWORD(lpszText) == 0) {
    if (!LoadStringA(psInfo->ppshheader.hInstance, 
                     LOWORD(lpszText), szTitle, sizeof(szTitle)-1))
      return;
    lpszText = szTitle;
  }
  if (dwStyle & PSH_PROPTITLE)
  {
    char* dest;
    int lentitle = strlen(lpszText);
    int lenprop  = strlen(psInfo->strPropertiesFor);

    dest = COMCTL32_Alloc(lentitle + lenprop + 1);
    strcpy(dest, psInfo->strPropertiesFor);
    strcat(dest, lpszText);

    SetWindowTextA(hwndDlg, dest);
    COMCTL32_Free(dest);
  }
  else
    SetWindowTextA(hwndDlg, lpszText);
}

/******************************************************************************
 *            PROPSHEET_SetFinishTextA
 */
static void PROPSHEET_SetFinishTextA(HWND hwndDlg, LPCSTR lpszText)
{
  HWND hwndButton = GetDlgItem(hwndDlg, IDC_FINISH_BUTTON);

  /* Set text, show and enable the Finish button */
  SetWindowTextA(hwndButton, lpszText);
  ShowWindow(hwndButton, SW_SHOW);
  EnableWindow(hwndButton, TRUE);

  /* Make it default pushbutton */
  SendMessageA(hwndDlg, DM_SETDEFID, IDC_FINISH_BUTTON, 0);

  /* Hide Back button */
  hwndButton = GetDlgItem(hwndDlg, IDC_BACK_BUTTON);
  ShowWindow(hwndButton, SW_HIDE);

  /* Hide Next button */
  hwndButton = GetDlgItem(hwndDlg, IDC_NEXT_BUTTON);
  ShowWindow(hwndButton, SW_HIDE);
}

/******************************************************************************
 *            PROPSHEET_QuerySiblings
 */
static LRESULT PROPSHEET_QuerySiblings(HWND hwndDlg,
                                       WPARAM wParam, LPARAM lParam)
{
  int i = 0;
  HWND hwndPage;
  LRESULT msgResult = 0;
  PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                    PropSheetInfoStr);

  while ((i < psInfo->nPages) && (msgResult == 0))
  {
    hwndPage = psInfo->proppage[i].hwndPage;
    msgResult = SendMessageA(hwndPage, PSM_QUERYSIBLINGS, wParam, lParam);
    i++;
  }

  return msgResult;
}


/******************************************************************************
 *            PROPSHEET_AddPage
 */
static BOOL PROPSHEET_AddPage(HWND hwndDlg,
                              HPROPSHEETPAGE hpage)
{
  PropSheetInfo * psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                     PropSheetInfoStr);
  HWND hwndTabControl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  TCITEMA item;
  char tabtext[MAX_TABTEXT_LENGTH] = "Tab text";
  LPCPROPSHEETPAGEA ppsp = (LPCPROPSHEETPAGEA)hpage;

  /*
   * Allocate and fill in a new PropPageInfo entry.
   */
  psInfo->proppage = (PropPageInfo*) COMCTL32_ReAlloc(psInfo->proppage,
                                                      sizeof(PropPageInfo) *
                                                      (psInfo->nPages + 1));
  if (!PROPSHEET_CollectPageInfo(ppsp, psInfo, psInfo->nPages))
      return FALSE;

  psInfo->proppage[psInfo->nPages].hpage = hpage;

  if (ppsp->dwFlags & PSP_PREMATURE)
  {
     /* Create the page but don't show it */
     PROPSHEET_CreatePage(hwndDlg, psInfo->nPages, psInfo, ppsp);
  }

  /*
   * Add a new tab to the tab control.
   */
  item.mask = TCIF_TEXT;
  item.pszText = tabtext;
  item.cchTextMax = MAX_TABTEXT_LENGTH;

  WideCharToMultiByte(CP_ACP, 0,
                      (LPCWSTR)psInfo->proppage[psInfo->nPages].pszText,
                      -1, tabtext, MAX_TABTEXT_LENGTH, NULL, NULL);

  SendMessageA(hwndTabControl, TCM_INSERTITEMA, psInfo->nPages + 1,
               (LPARAM)&item);

  psInfo->nPages++;

  /* If it is the only page - show it */
  if(psInfo->nPages == 1)
     PROPSHEET_ShowPage(hwndDlg, 0, psInfo);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_RemovePage
 */
static BOOL PROPSHEET_RemovePage(HWND hwndDlg,
                                 int index,
                                 HPROPSHEETPAGE hpage)
{
  PropSheetInfo * psInfo = (PropSheetInfo*) GetPropA(hwndDlg,
                                                     PropSheetInfoStr);
  HWND hwndTabControl = GetDlgItem(hwndDlg, IDC_TABCONTROL);
  PropPageInfo* oldPages;

  if (!psInfo) {
    return FALSE;
  }
  oldPages = psInfo->proppage;
  /*
   * hpage takes precedence over index.
   */
  if (hpage != 0)
  {
    index = PROPSHEET_GetPageIndex(hpage, psInfo);
  }

  /* Make sure that index is within range */
  if (index < 0 || index >= psInfo->nPages)
  {
      TRACE("Could not find page to remove!\n");
      return FALSE;
  }

  TRACE("total pages %d removing page %d active page %d\n",
        psInfo->nPages, index, psInfo->active_page);
  /*
   * Check if we're removing the active page.
   */
  if (index == psInfo->active_page)
  {
    if (psInfo->nPages > 1)
    {
      if (index > 0)
      {
        /* activate previous page  */
        PROPSHEET_ShowPage(hwndDlg, index - 1, psInfo);
      }
      else
      {
        /* activate the next page */
        PROPSHEET_ShowPage(hwndDlg, index + 1, psInfo);
        psInfo->active_page = index;
      }
    }
    else
    {
      psInfo->active_page = -1;
      if (!psInfo->isModeless)
      {
         EndDialog(hwndDlg, FALSE);
         return TRUE;
      }
    }
  }
  else if (index < psInfo->active_page)
    psInfo->active_page--;

  /* Destroy page dialog window */
  DestroyWindow(psInfo->proppage[index].hwndPage);

  /* Free page resources */
  if(psInfo->proppage[index].hpage)
  {
     PROPSHEETPAGEA* psp = (PROPSHEETPAGEA*)psInfo->proppage[index].hpage;

     if ((psp->dwFlags & PSP_USETITLE) && psInfo->proppage[index].pszText)
        HeapFree(GetProcessHeap(), 0, (LPVOID)psInfo->proppage[index].pszText);

     DestroyPropertySheetPage(psInfo->proppage[index].hpage);
  }
 
  /* Remove the tab */
  SendMessageA(hwndTabControl, TCM_DELETEITEM, index, 0);

  psInfo->nPages--;
  psInfo->proppage = COMCTL32_Alloc(sizeof(PropPageInfo) * psInfo->nPages);

  if (index > 0)  
    memcpy(&psInfo->proppage[0], &oldPages[0], index * sizeof(PropPageInfo));

  if (index < psInfo->nPages)
    memcpy(&psInfo->proppage[index], &oldPages[index + 1],
           (psInfo->nPages - index) * sizeof(PropPageInfo));

  COMCTL32_Free(oldPages);

  return FALSE;
}

/******************************************************************************
 *            PROPSHEET_SetWizButtons
 *
 * This code will work if (and assumes that) the Next button is on top of the
 * Finish button. ie. Finish comes after Next in the Z order.
 * This means make sure the dialog template reflects this.
 *
 */
static void PROPSHEET_SetWizButtons(HWND hwndDlg, DWORD dwFlags)
{
  HWND hwndBack   = GetDlgItem(hwndDlg, IDC_BACK_BUTTON);
  HWND hwndNext   = GetDlgItem(hwndDlg, IDC_NEXT_BUTTON);
  HWND hwndFinish = GetDlgItem(hwndDlg, IDC_FINISH_BUTTON);

  TRACE("%ld\n", dwFlags);

  EnableWindow(hwndBack, FALSE);
  EnableWindow(hwndNext, FALSE);
  EnableWindow(hwndFinish, FALSE);

  if (dwFlags & PSWIZB_BACK)
    EnableWindow(hwndBack, TRUE);

  if (dwFlags & PSWIZB_NEXT)
  {
    /* Hide the Finish button */
    ShowWindow(hwndFinish, SW_HIDE);

    /* Show and enable the Next button */
    ShowWindow(hwndNext, SW_SHOW);
    EnableWindow(hwndNext, TRUE);

    /* Set the Next button as the default pushbutton  */
    SendMessageA(hwndDlg, DM_SETDEFID, IDC_NEXT_BUTTON, 0);
  }

  if ((dwFlags & PSWIZB_FINISH) || (dwFlags & PSWIZB_DISABLEDFINISH))
  {
    /* Hide the Next button */
    ShowWindow(hwndNext, SW_HIDE);

    /* Show the Finish button */
    ShowWindow(hwndFinish, SW_SHOW);

    if (dwFlags & PSWIZB_FINISH)
      EnableWindow(hwndFinish, TRUE);

    /* Set the Finish button as the default pushbutton  */
    SendMessageA(hwndDlg, DM_SETDEFID, IDC_FINISH_BUTTON, 0);
  }
}

/******************************************************************************
 *            PROPSHEET_GetPageIndex
 *
 * Given a HPROPSHEETPAGE, returns the index of the corresponding page from
 * the array of PropPageInfo.
 */
static int PROPSHEET_GetPageIndex(HPROPSHEETPAGE hpage, PropSheetInfo* psInfo)
{
  BOOL found = FALSE;
  int index = 0;

  while ((index < psInfo->nPages) && (found == FALSE))
  {
    if (psInfo->proppage[index].hpage == hpage)
      found = TRUE;
    else
      index++;
  }

  if (found == FALSE)
    index = -1;

  return index;
}

/******************************************************************************
 *            PROPSHEET_CleanUp
 */
static void PROPSHEET_CleanUp(HWND hwndDlg)
{
  int i;
  PropSheetInfo* psInfo = (PropSheetInfo*) RemovePropA(hwndDlg,
                                                       PropSheetInfoStr);

  TRACE("\n");
  if (HIWORD(psInfo->ppshheader.pszCaption))
      HeapFree(GetProcessHeap(), 0, (LPVOID)psInfo->ppshheader.pszCaption);

  for (i = 0; i < psInfo->nPages; i++)
  {
     PROPSHEETPAGEA* psp = (PROPSHEETPAGEA*)psInfo->proppage[i].hpage;

     if(psInfo->proppage[i].hwndPage)
        DestroyWindow(psInfo->proppage[i].hwndPage);

     if(psp)
     {
        if ((psp->dwFlags & PSP_USETITLE) && psInfo->proppage[i].pszText)
           HeapFree(GetProcessHeap(), 0, (LPVOID)psInfo->proppage[i].pszText);

        DestroyPropertySheetPage(psInfo->proppage[i].hpage);
     }
  }

  COMCTL32_Free(psInfo->proppage);
  COMCTL32_Free(psInfo->strPropertiesFor);
  ImageList_Destroy(psInfo->hImageList);

  GlobalFree((HGLOBAL)psInfo);
}

/******************************************************************************
 *            PropertySheetA   (COMCTL32.84)(COMCTL32.83)
 */
INT WINAPI PropertySheetA(LPCPROPSHEETHEADERA lppsh)
{
  int bRet = 0;
  PropSheetInfo* psInfo = (PropSheetInfo*) GlobalAlloc(GPTR,
                                                       sizeof(PropSheetInfo));
  int i, n;
  BYTE* pByte;

  PROPSHEET_CollectSheetInfo(lppsh, psInfo);

  psInfo->proppage = (PropPageInfo*) COMCTL32_Alloc(sizeof(PropPageInfo) *
                                                    lppsh->nPages);
  pByte = (BYTE*) psInfo->ppshheader.u3.ppsp;

  for (n = i = 0; i < lppsh->nPages; i++, n++)
  {
    if (!(lppsh->dwFlags & PSH_PROPSHEETPAGE))
      psInfo->proppage[n].hpage = psInfo->ppshheader.u3.phpage[i];
    else
    {
       psInfo->proppage[n].hpage = CreatePropertySheetPageA((LPCPROPSHEETPAGEA)pByte);
       pByte += ((LPPROPSHEETPAGEA)pByte)->dwSize;
    }

    if (!PROPSHEET_CollectPageInfo((LPCPROPSHEETPAGEA)psInfo->proppage[n].hpage,
                               psInfo, n))
    {
	if (lppsh->dwFlags & PSH_PROPSHEETPAGE)
	    DestroyPropertySheetPage(psInfo->proppage[n].hpage);
	n--;
	psInfo->nPages--;
    }
  }

  bRet = PROPSHEET_CreateDialog(psInfo);

  return bRet;
}

/******************************************************************************
 *            PropertySheetW   (COMCTL32.85)
 */
INT WINAPI PropertySheetW(LPCPROPSHEETHEADERW propertySheetHeader)
{
    FIXME("(%p): stub\n", propertySheetHeader);

    return -1;
}

/******************************************************************************
 *            CreatePropertySheetPageA   (COMCTL32.19)(COMCTL32.18)
 */
HPROPSHEETPAGE WINAPI CreatePropertySheetPageA(
                          LPCPROPSHEETPAGEA lpPropSheetPage)
{
  PROPSHEETPAGEA* ppsp = COMCTL32_Alloc(sizeof(PROPSHEETPAGEA));

  *ppsp = *lpPropSheetPage;

  if ( !(ppsp->dwFlags & PSP_DLGINDIRECT) && HIWORD( ppsp->u.pszTemplate ) )
    ppsp->u.pszTemplate = HEAP_strdupA( GetProcessHeap(), 0, lpPropSheetPage->u.pszTemplate );

  if ( (ppsp->dwFlags & PSP_USEICONID) && HIWORD( ppsp->u2.pszIcon ) )
      ppsp->u2.pszIcon = HEAP_strdupA( GetProcessHeap(), 0, lpPropSheetPage->u2.pszIcon );
       

  if ((ppsp->dwFlags & PSP_USETITLE) && HIWORD( ppsp->pszTitle ))
      ppsp->pszTitle = HEAP_strdupA( GetProcessHeap(), 0, lpPropSheetPage->pszTitle );
  else if ( !(ppsp->dwFlags & PSP_USETITLE) )
      ppsp->pszTitle = NULL;

  return (HPROPSHEETPAGE)ppsp;
}

/******************************************************************************
 *            CreatePropertySheetPageW   (COMCTL32.20)
 */
HPROPSHEETPAGE WINAPI CreatePropertySheetPageW(LPCPROPSHEETPAGEW lpPropSheetPage)
{
    FIXME("(%p): stub\n", lpPropSheetPage);

    return 0;
}

/******************************************************************************
 *            DestroyPropertySheetPage   (COMCTL32.24)
 */
BOOL WINAPI DestroyPropertySheetPage(HPROPSHEETPAGE hPropPage)
{
  PROPSHEETPAGEA *psp = (PROPSHEETPAGEA *)hPropPage;

  if (!psp)
     return FALSE;

  if ( !(psp->dwFlags & PSP_DLGINDIRECT) && HIWORD( psp->u.pszTemplate ) )
     HeapFree(GetProcessHeap(), 0, (LPVOID)psp->u.pszTemplate);

  if ( (psp->dwFlags & PSP_USEICONID) && HIWORD( psp->u2.pszIcon ) )
     HeapFree(GetProcessHeap(), 0, (LPVOID)psp->u2.pszIcon);

  if ((psp->dwFlags & PSP_USETITLE) && HIWORD( psp->pszTitle ))
      HeapFree(GetProcessHeap(), 0, (LPVOID)psp->pszTitle);

  COMCTL32_Free(hPropPage);

  return TRUE;
}

/******************************************************************************
 *            PROPSHEET_IsDialogMessage
 */
static BOOL PROPSHEET_IsDialogMessage(HWND hwnd, LPMSG lpMsg)
{
   PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwnd, PropSheetInfoStr);

   if (!psInfo || (hwnd != lpMsg->hwnd && !IsChild(hwnd, lpMsg->hwnd)))
      return FALSE;

   if (lpMsg->message == WM_KEYDOWN && (GetKeyState(VK_CONTROL) & 0x8000))
   {
      int new_page = 0;
      INT dlgCode = SendMessageA(lpMsg->hwnd, WM_GETDLGCODE, 0, (LPARAM)lpMsg);

      if (!(dlgCode & DLGC_WANTMESSAGE))
      {
         switch (lpMsg->wParam)
         {
            case VK_TAB:
               if (GetKeyState(VK_SHIFT) & 0x8000)
                   new_page = -1;
                else
                   new_page = 1;
               break;

            case VK_NEXT:   new_page = 1;  break;
            case VK_PRIOR:  new_page = -1; break;
         }
      }

      if (new_page)
      {
         if (PROPSHEET_CanSetCurSel(hwnd) != FALSE)
         {
            new_page += psInfo->active_page;

            if (new_page < 0)
               new_page = psInfo->nPages - 1;
            else if (new_page >= psInfo->nPages)
               new_page = 0;

            PROPSHEET_SetCurSel(hwnd, new_page, 0);
         }

         return TRUE;
      }
   }

   return IsDialogMessageA(hwnd, lpMsg);
}

/******************************************************************************
 *            PROPSHEET_DialogProc
 */
BOOL WINAPI
PROPSHEET_DialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  switch (uMsg)
  {
    case WM_INITDIALOG:
    {
      PropSheetInfo* psInfo = (PropSheetInfo*) lParam;
      char* strCaption = (char*)COMCTL32_Alloc(MAX_CAPTION_LENGTH);
      HWND hwndTabCtrl = GetDlgItem(hwnd, IDC_TABCONTROL);
      LPCPROPSHEETPAGEA ppshpage;
      int idx;

      SetPropA(hwnd, PropSheetInfoStr, (HANDLE)psInfo);

      /*
       * psInfo->hwnd is not being used by WINE code - it exists 
       * for compatibility with "real" Windoze. The same about 
       * SetWindowLong - WINE is only using the PropSheetInfoStr
       * property.
       */
      psInfo->hwnd = hwnd;
      SetWindowLongA(hwnd,DWL_USER,(LONG)psInfo);

      /*
       * Small icon in the title bar.
       */
      if ((psInfo->ppshheader.dwFlags & PSH_USEICONID) ||
          (psInfo->ppshheader.dwFlags & PSH_USEHICON))
      {
        HICON hIcon;
        int icon_cx = GetSystemMetrics(SM_CXSMICON);
        int icon_cy = GetSystemMetrics(SM_CYSMICON);

        if (psInfo->ppshheader.dwFlags & PSH_USEICONID)
          hIcon = LoadImageA(psInfo->ppshheader.hInstance,
                             psInfo->ppshheader.u.pszIcon,
                             IMAGE_ICON,
                             icon_cx, icon_cy,
                             LR_DEFAULTCOLOR);
        else
          hIcon = psInfo->ppshheader.u.hIcon;

        SendMessageA(hwnd, WM_SETICON, 0, hIcon);
      }
      
      if (psInfo->ppshheader.dwFlags & PSH_USEHICON)
        SendMessageA(hwnd, WM_SETICON, 0, psInfo->ppshheader.u.hIcon);

      psInfo->strPropertiesFor = strCaption;

      GetWindowTextA(hwnd, psInfo->strPropertiesFor, MAX_CAPTION_LENGTH);

      PROPSHEET_CreateTabControl(hwnd, psInfo);

      if (psInfo->ppshheader.dwFlags & PSH_WIZARD)
      {
        if (PROPSHEET_IsTooSmallWizard(hwnd, psInfo))
        {
          PROPSHEET_AdjustSizeWizard(hwnd, psInfo);
          PROPSHEET_AdjustButtonsWizard(hwnd, psInfo);
        }
      }
      else
      {
        if (PROPSHEET_SizeMismatch(hwnd, psInfo))
        {
          PROPSHEET_AdjustSize(hwnd, psInfo);
          PROPSHEET_AdjustButtons(hwnd, psInfo);
        }
      }

      if (psInfo->useCallback) 
             (*(psInfo->ppshheader.pfnCallback))(hwnd, 
					      PSCB_INITIALIZED, (LPARAM)0); 

      idx = psInfo->active_page;
      ppshpage = (LPCPROPSHEETPAGEA)psInfo->proppage[idx].hpage;
      psInfo->active_page = -1;
 
      PROPSHEET_SetCurSel(hwnd, idx, psInfo->proppage[idx].hpage);

      if (!(psInfo->ppshheader.dwFlags & PSH_WIZARD))
        SendMessageA(hwndTabCtrl, TCM_SETCURSEL, psInfo->active_page, 0);

      if (!HIWORD(psInfo->ppshheader.pszCaption) &&
              psInfo->ppshheader.hInstance)
      {
         char szText[256];

         if (LoadStringA(psInfo->ppshheader.hInstance, 
                 (UINT)psInfo->ppshheader.pszCaption, szText, 255))
            PROPSHEET_SetTitleA(hwnd, psInfo->ppshheader.dwFlags, szText);
      }
      else
      {
         PROPSHEET_SetTitleA(hwnd, psInfo->ppshheader.dwFlags,
                         psInfo->ppshheader.pszCaption);
      }

      return TRUE;
    }

    case WM_DESTROY:
      PROPSHEET_CleanUp(hwnd);
      return TRUE;

    case WM_CLOSE:
      PROPSHEET_Cancel(hwnd, 1);
      return TRUE;

    case WM_COMMAND:
    {
      WORD wID = LOWORD(wParam);

      switch (wID)
      {
        case IDOK:
        case IDC_APPLY_BUTTON:
        {
          HWND hwndApplyBtn = GetDlgItem(hwnd, IDC_APPLY_BUTTON);

          if (PROPSHEET_Apply(hwnd, wID == IDOK ? 1: 0) == FALSE)
            break;

          if (wID == IDOK)
          {
            PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwnd,
                                                            PropSheetInfoStr);
            int result = TRUE;

            if (psInfo->restartWindows)
              result = ID_PSRESTARTWINDOWS;

            /* reboot system takes precedence over restart windows */
            if (psInfo->rebootSystem)
              result = ID_PSREBOOTSYSTEM;

            if (psInfo->isModeless)
              psInfo->activeValid = FALSE;
            else
              EndDialog(hwnd, result);
          }
          else
             EnableWindow(hwndApplyBtn, FALSE);

          break;
        }

        case IDC_BACK_BUTTON:
          PROPSHEET_Back(hwnd);
          break;

        case IDC_NEXT_BUTTON:
          PROPSHEET_Next(hwnd);
          break;

        case IDC_FINISH_BUTTON:
          PROPSHEET_Finish(hwnd);
          break;

        case IDCANCEL:
          PROPSHEET_Cancel(hwnd, 0);
          break;

        case IDHELP:
          PROPSHEET_Help(hwnd);
          break;
      }

      return TRUE;
    }

    case WM_NOTIFY:
    {
      NMHDR* pnmh = (LPNMHDR) lParam;

      if (pnmh->code == TCN_SELCHANGE)
      {
        int index = SendMessageA(pnmh->hwndFrom, TCM_GETCURSEL, 0, 0);
        PROPSHEET_SetCurSel(hwnd, index, 0);
      }

      if(pnmh->code == TCN_SELCHANGING)
      {
        BOOL bRet = PROPSHEET_CanSetCurSel(hwnd);
        SetWindowLongA(hwnd, DWL_MSGRESULT, !bRet);
        return TRUE;
      }


      return 0;
    }

    case PSM_GETCURRENTPAGEHWND:
    {
      PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwnd,
                                                        PropSheetInfoStr);
      HWND hwndPage = 0;

      if (psInfo->activeValid && psInfo->active_page != -1)
        hwndPage = psInfo->proppage[psInfo->active_page].hwndPage;

      SetWindowLongA(hwnd, DWL_MSGRESULT, hwndPage);

      return TRUE;
    }

    case PSM_CHANGED:
      PROPSHEET_Changed(hwnd, (HWND)wParam);
      return TRUE;

    case PSM_UNCHANGED:
      PROPSHEET_UnChanged(hwnd, (HWND)wParam);
      return TRUE;

    case PSM_GETTABCONTROL:
    {
      HWND hwndTabCtrl = GetDlgItem(hwnd, IDC_TABCONTROL);

      SetWindowLongA(hwnd, DWL_MSGRESULT, hwndTabCtrl);

      return TRUE;
    }

    case PSM_SETCURSEL:
    {
      BOOL msgResult;

      msgResult = PROPSHEET_CanSetCurSel(hwnd);
      if(msgResult != FALSE)
      {
        msgResult = PROPSHEET_SetCurSel(hwnd,
                                       (int)wParam,
                                       (HPROPSHEETPAGE)lParam);
      }

      SetWindowLongA(hwnd, DWL_MSGRESULT, msgResult);

      return TRUE;
    }

    case PSM_CANCELTOCLOSE:
    {
      char buf[MAX_BUTTONTEXT_LENGTH];
      HWND hwndOK = GetDlgItem(hwnd, IDOK);
      HWND hwndCancel = GetDlgItem(hwnd, IDCANCEL);

      EnableWindow(hwndCancel, FALSE);
      if (LoadStringA(COMCTL32_hModule, IDS_CLOSE, buf, sizeof(buf)))
         SetWindowTextA(hwndOK, buf);
 
      return FALSE;
    }

    case PSM_RESTARTWINDOWS:
    {
      PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwnd,
                                                        PropSheetInfoStr);

      psInfo->restartWindows = TRUE;
      return TRUE;
    }

    case PSM_REBOOTSYSTEM:
    {
      PropSheetInfo* psInfo = (PropSheetInfo*) GetPropA(hwnd, 
                                                        PropSheetInfoStr);

      psInfo->rebootSystem = TRUE;
      return TRUE;
    }

    case PSM_SETTITLEA:
      PROPSHEET_SetTitleA(hwnd, (DWORD) wParam, (LPCSTR) lParam);
      return TRUE;

    case PSM_APPLY:
    {
      BOOL msgResult = PROPSHEET_Apply(hwnd, 0);

      SetWindowLongA(hwnd, DWL_MSGRESULT, msgResult);

      return TRUE;
    }

    case PSM_QUERYSIBLINGS:
    {
      LRESULT msgResult = PROPSHEET_QuerySiblings(hwnd, wParam, lParam);

      SetWindowLongA(hwnd, DWL_MSGRESULT, msgResult);

      return TRUE;
    }

    case PSM_ADDPAGE:
    {
      /*
       * Note: MSVC++ 6.0 documentation says that PSM_ADDPAGE does not have
       *       a return value. This is not true. PSM_ADDPAGE returns TRUE
       *       on success or FALSE otherwise, as specified on MSDN Online.
       *       Also see the MFC code for
       *       CPropertySheet::AddPage(CPropertyPage* pPage).
       */

      BOOL msgResult = PROPSHEET_AddPage(hwnd, (HPROPSHEETPAGE)lParam);

      SetWindowLongA(hwnd, DWL_MSGRESULT, msgResult);

      return TRUE;
    }

    case PSM_REMOVEPAGE:
      PROPSHEET_RemovePage(hwnd, (int)wParam, (HPROPSHEETPAGE)lParam);
      return TRUE;

    case PSM_ISDIALOGMESSAGE:
    {
       BOOL msgResult = PROPSHEET_IsDialogMessage(hwnd, (LPMSG)lParam);
       SetWindowLongA(hwnd, DWL_MSGRESULT, msgResult);
       return TRUE;
    }

    case PSM_PRESSBUTTON:
      PROPSHEET_PressButton(hwnd, (int)wParam);
      return TRUE;

    case PSM_SETFINISHTEXTA:
      PROPSHEET_SetFinishTextA(hwnd, (LPCSTR) lParam);        
      return TRUE;

    case PSM_SETWIZBUTTONS:
      PROPSHEET_SetWizButtons(hwnd, (DWORD)lParam);
      return TRUE;

    case PSM_SETTITLEW:
        FIXME("Unimplemented msg PSM_SETTITLE32W\n");
        return 0;
    case PSM_SETCURSELID:
        FIXME("Unimplemented msg PSM_SETCURSELID\n");
        return 0;
    case PSM_SETFINISHTEXTW:
        FIXME("Unimplemented msg PSM_SETFINISHTEXT32W\n");
        return 0;

    default:
      return FALSE;
  }
}