source: trunk/src/comctl32/tab.cpp@ 4777

/* $Id: tab.cpp,v 1.4 2000-05-22 17:25:11 cbratschi Exp $ */
/*
 * Tab control
 *
 * Copyright 1998 Anders Carlsson
 * Copyright 1999 Alex Priem <alexp@sci.kun.nl>
 * Copyright 1999 Francis Beaudet
 * Copyright 1999 Achim Hasenmueller
 * Copyright 1999 Christoph Bratschi
 *
 * TODO:
 *  Image list support
 *  Multiline support
 */

/* inconsistent: report! */
/*
 - Corel WINE 20000513 level
 - (WINE 991212 level)
*/

#include <string.h>

#include "winbase.h"
#include "commctrl.h"
#include "ccbase.h"
#include "tab.h"
#include "comctl32.h"


/******************************************************************************
 * Positioning constants
 */
#define SELECTED_TAB_OFFSET     2
#define HORIZONTAL_ITEM_PADDING 5
#define VERTICAL_ITEM_PADDING   3
#define ROUND_CORNER_SIZE       2
#define FOCUS_RECT_HOFFSET      2
#define FOCUS_RECT_VOFFSET      1
#define DISPLAY_AREA_PADDINGX   5
#define DISPLAY_AREA_PADDINGY   5
#define CONTROL_BORDER_SIZEX    2
#define CONTROL_BORDER_SIZEY    2
#define BUTTON_SPACINGX         10
#define DEFAULT_TAB_WIDTH       96

#define TAB_GetInfoPtr(hwnd) ((TAB_INFO*)getInfoPtr(hwnd))

/******************************************************************************
 * Hot-tracking timer constants
 */
#define TAB_HOTTRACK_TIMER            1
#define TAB_HOTTRACK_TIMER_INTERVAL   100   /* milliseconds */

/******************************************************************************
 * Prototypes
 */
static void TAB_Refresh (HWND hwnd, HDC hdc);
static void TAB_InvalidateTabArea(HWND      hwnd, TAB_INFO* infoPtr);
static void TAB_EnsureSelectionVisible(HWND hwnd, TAB_INFO* infoPtr);
static void TAB_DrawItem(HWND hwnd, HDC hdc, INT iItem);
static void TAB_DrawItemInterior(HWND hwnd, HDC hdc, INT iItem, RECT* drawRect);

static VOID
TAB_RelayEvent (HWND hwndTip, HWND hwndMsg, UINT uMsg,
            WPARAM wParam, LPARAM lParam)
{
    MSG msg;

    msg.hwnd = hwndMsg;
    msg.message = uMsg;
    msg.wParam = wParam;
    msg.lParam = lParam;
    msg.time = GetMessageTime ();
    msg.pt.x = LOWORD(GetMessagePos ());
    msg.pt.y = HIWORD(GetMessagePos ());

    SendMessageA (hwndTip, TTM_RELAYEVENT, 0, (LPARAM)&msg);
}

static LRESULT
TAB_GetCurSel (HWND hwnd)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

    return infoPtr->iSelected;
}

static LRESULT
TAB_GetCurFocus (HWND hwnd)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

    return infoPtr->uFocus;
}

static LRESULT
TAB_GetToolTips (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

    if (infoPtr == NULL) return 0;
    return infoPtr->hwndToolTip;
}


static LRESULT
TAB_SetCurSel (HWND hwnd,WPARAM wParam)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  INT iItem=(INT) wParam;
  INT prevItem;

  prevItem=-1;
  if ((iItem >= 0) && (iItem < infoPtr->uNumItem)) {
    prevItem=infoPtr->iSelected;
      infoPtr->iSelected=iItem;
      TAB_EnsureSelectionVisible(hwnd, infoPtr);
      TAB_InvalidateTabArea(hwnd, infoPtr);
  }
  return prevItem;
}

static LRESULT
TAB_SetCurFocus (HWND hwnd,WPARAM wParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  INT iItem=(INT) wParam;

  if ((iItem < 0) || (iItem >= infoPtr->uNumItem)) return 0;

  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BUTTONS)
  {
    //FIXME (tab,"Should set input focus\n");
  } else
  {
    if (infoPtr->iSelected != iItem || infoPtr->uFocus == -1)
    {
      infoPtr->uFocus = iItem;
      if (sendNotify(hwnd,TCN_SELCHANGING) != TRUE)
      {
        infoPtr->iSelected = iItem;
        sendNotify(hwnd,TCN_SELCHANGE);

        TAB_EnsureSelectionVisible(hwnd, infoPtr);
        TAB_InvalidateTabArea(hwnd, infoPtr);
      }
    }
  }
  return 0;
}

static LRESULT
TAB_SetToolTips (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

    if (infoPtr == NULL) return 0;
    infoPtr->hwndToolTip = (HWND)wParam;
    return 0;
}

/******************************************************************************
 * TAB_InternalGetItemRect
 *
 * This method will calculate the rectangle representing a given tab item in
 * client coordinates. This method takes scrolling into account.
 *
 * This method returns TRUE if the item is visible in the window and FALSE
 * if it is completely outside the client area.
 */
static BOOL TAB_InternalGetItemRect(
  HWND        hwnd,
  TAB_INFO*   infoPtr,
  INT         itemIndex,
  RECT*       itemRect,
  RECT*       selectedRect)
{
  RECT tmpItemRect,clientRect;
  LONG        lStyle  = GetWindowLongA(hwnd, GWL_STYLE);

  /*
   * Perform a sanity check and a trivial visibility check.
   */
  if ( (infoPtr->uNumItem <= 0) ||
       (itemIndex >= infoPtr->uNumItem) ||
       (!(lStyle &TCS_MULTILINE) && (itemIndex < infoPtr->leftmostVisible)) )
    return FALSE;

  /*
   * Avoid special cases in this procedure by assigning the "out"
   * parameters if the caller didn't supply them
   */
  if (itemRect==NULL)
    itemRect = &tmpItemRect;

  /*
   * Retrieve the unmodified item rect.
   */
  *itemRect = infoPtr->items[itemIndex].rect;

  /*
   * calculate the times bottom and top based on the row
   */
  GetClientRect(hwnd, &clientRect);

  if (lStyle & TCS_BOTTOM)
  {
    itemRect->bottom = clientRect.bottom -
                      SELECTED_TAB_OFFSET -
                      itemRect->top * (infoPtr->tabHeight - 2);

    itemRect->top = clientRect.bottom -
                   infoPtr->tabHeight -
                   itemRect->top * ( infoPtr->tabHeight - 2);
  }
  else
  {
    itemRect->bottom = clientRect.top +
                      infoPtr->tabHeight +
                      itemRect->top * (infoPtr->tabHeight - 2);
    itemRect->top = clientRect.top +
                   SELECTED_TAB_OFFSET+
                   itemRect->top * (infoPtr->tabHeight - 2);
 }

  /*
   * "scroll" it to make sure the item at the very left of the
   * tab control is the leftmost visible tab.
   */
  OffsetRect(itemRect,
             -infoPtr->items[infoPtr->leftmostVisible].rect.left,
             0);

  /*
   * Move the rectangle so the first item is slightly offset from
   * the left of the tab control.
   */
  OffsetRect(itemRect,
             SELECTED_TAB_OFFSET,
             0);


  /*
   * Now, calculate the position of the item as if it were selected.
   */
  if (selectedRect!=NULL)
  {
    CopyRect(selectedRect, itemRect);

    /*
     * The rectangle of a selected item is a bit wider.
     */
    InflateRect(selectedRect, SELECTED_TAB_OFFSET, 0);

    /*
     * If it also a bit higher.
     */
    if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
    {
      selectedRect->top    -=2; /* the border is thicker on the bottom */
      selectedRect->bottom +=SELECTED_TAB_OFFSET;
    }
    else
    {
      selectedRect->top   -=SELECTED_TAB_OFFSET;
      selectedRect->bottom+=1;
    }
  }

  return TRUE;
}

static BOOL TAB_GetItemRect(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  return TAB_InternalGetItemRect(hwnd, TAB_GetInfoPtr(hwnd), (INT)wParam,
                                 (LPRECT)lParam, (LPRECT)NULL);
}

/******************************************************************************
 * TAB_KeyUp
 *
 * This method is called to handle keyboard input
 */
static LRESULT TAB_KeyUp(
  HWND   hwnd,
  WPARAM keyCode)
{
  TAB_INFO* infoPtr = TAB_GetInfoPtr(hwnd);
  int       newItem = -1;

  switch (keyCode)
  {
    case VK_LEFT:
      newItem = infoPtr->uFocus-1;
      break;
    case VK_RIGHT:
      newItem = infoPtr->uFocus+1;
      break;
  }

  /*
   * If we changed to a valid item, change the selection
   */
  if ( (newItem >= 0) &&
       (newItem < infoPtr->uNumItem) &&
       (infoPtr->uFocus != newItem) )
  {
    if (!sendNotify(hwnd,TCN_SELCHANGING))
    {
      infoPtr->iSelected = newItem;
      infoPtr->uFocus    = newItem;
      sendNotify(hwnd,TCN_SELCHANGE);

      TAB_EnsureSelectionVisible(hwnd, infoPtr);
      TAB_InvalidateTabArea(hwnd, infoPtr);
    }
  }

  return 0;
}

/******************************************************************************
 * TAB_FocusChanging
 *
 * This method is called whenever the focus goes in or out of this control
 * it is used to update the visual state of the control.
 */
static LRESULT TAB_FocusChanging(
  HWND   hwnd,
  UINT   uMsg,
  WPARAM wParam,
  LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  RECT      selectedRect;
  BOOL      isVisible;

  /*
   * Get the rectangle for the item.
   */
  isVisible = TAB_InternalGetItemRect(hwnd,
                                      infoPtr,
                                      infoPtr->uFocus,
                                      NULL,
                                      &selectedRect);

  /*
   * If the rectangle is not completely invisible, invalidate that
   * portion of the window.
   */
  if (isVisible)
  {
    InvalidateRect(hwnd, &selectedRect, TRUE);
  }

  /*
   * Don't otherwise disturb normal behavior.
   */
  return DefWindowProcA (hwnd, uMsg, wParam, lParam);
}

static HWND TAB_InternalHitTest (
  HWND      hwnd,
  TAB_INFO* infoPtr,
  POINT     pt,
  UINT*     flags)

{
  RECT rect;
  int iCount;

  for (iCount = 0; iCount < infoPtr->uNumItem; iCount++)
  {
    TAB_InternalGetItemRect(hwnd,
                            infoPtr,
                            iCount,
                            &rect,
                            NULL);

    if (PtInRect (&rect, pt))
    {
      *flags = TCHT_ONITEM;
      return iCount;
    }
  }

  *flags=TCHT_NOWHERE;
  return -1;
}

static LRESULT
TAB_HitTest (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  LPTCHITTESTINFO lptest=(LPTCHITTESTINFO) lParam;

  return TAB_InternalHitTest (hwnd, infoPtr,lptest->pt,&lptest->flags);
}


static LRESULT
TAB_LButtonDown (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  POINT pt;
  INT newItem,dummy;

  if (infoPtr->hwndToolTip)
    TAB_RelayEvent (infoPtr->hwndToolTip, hwnd,
                    WM_LBUTTONDOWN, wParam, lParam);

  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_FOCUSONBUTTONDOWN ) {
    SetFocus (hwnd);
  }

  if (infoPtr->hwndToolTip)
    TAB_RelayEvent (infoPtr->hwndToolTip, hwnd,
                    WM_LBUTTONDOWN, wParam, lParam);

  pt.x = (INT)LOWORD(lParam);
  pt.y = (INT)HIWORD(lParam);

  newItem = TAB_InternalHitTest (hwnd, infoPtr, pt, (unsigned int*)&dummy);

//  TRACE("On Tab, item %d\n", newItem);

  if ( (newItem!=-1) &&
       (infoPtr->iSelected != newItem) )
  {
    if (sendNotify(hwnd,TCN_SELCHANGING) != TRUE)
    {
      infoPtr->iSelected = newItem;
      infoPtr->uFocus    = newItem;
      sendNotify(hwnd, TCN_SELCHANGE);

      TAB_EnsureSelectionVisible(hwnd, infoPtr);

      TAB_InvalidateTabArea(hwnd, infoPtr);
    }
  }
  return 0;
}

static LRESULT
TAB_LButtonUp (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  sendNotify(hwnd,NM_CLICK);

  return 0;
}

static LRESULT
TAB_RButtonDown (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  sendNotify(hwnd,NM_RCLICK);

  return 0;
}

/******************************************************************************
 * TAB_DrawLoneItemInterior
 *
 * This calls TAB_DrawItemInterior.  However, TAB_DrawItemInterior is normally
 * called by TAB_DrawItem which is normally called by TAB_Refresh which sets
 * up the device context and font.  This routine does the same setup but
 * only calls TAB_DrawItemInterior for the single specified item.
 */
static void
TAB_DrawLoneItemInterior(HWND hwnd, TAB_INFO* infoPtr, int iItem)
{
  HDC hdc = GetDC(hwnd);
  HFONT hOldFont = SelectObject(hdc, infoPtr->hFont);
  TAB_DrawItemInterior(hwnd, hdc, iItem, NULL);
  SelectObject(hdc, hOldFont);
  ReleaseDC(hwnd, hdc);
}

/******************************************************************************
 * TAB_HotTrackTimerProc
 *
 * When a mouse-move event causes a tab to be highlighted (hot-tracking), a
 * timer is setup so we can check if the mouse is moved out of our window.
 * (We don't get an event when the mouse leaves, the mouse-move events just
 * stop being delivered to our window and just start being delivered to
 * another window.)  This function is called when the timer triggers so
 * we can check if the mouse has left our window.  If so, we un-highlight
 * the hot-tracked tab.
 */
static VOID CALLBACK
TAB_HotTrackTimerProc
  (
  HWND hwnd,    // handle of window for timer messages
  UINT uMsg,    // WM_TIMER message
  UINT idEvent, // timer identifier
  DWORD dwTime  // current system time
  )
{
  TAB_INFO* infoPtr = TAB_GetInfoPtr(hwnd);

  if (infoPtr != NULL && infoPtr->iHotTracked >= 0)
  {
    POINT pt;

    /*
    ** If we can't get the cursor position, or if the cursor is outside our
    ** window, we un-highlight the hot-tracked tab.  Note that the cursor is
    ** "outside" even if it is within our bounding rect if another window
    ** overlaps.  Note also that the case where the cursor stayed within our
    ** window but has moved off the hot-tracked tab will be handled by the
    ** WM_MOUSEMOVE event.
    */
    if (!GetCursorPos(&pt) || WindowFromPoint(pt) != hwnd)
    {
      // Redraw iHotTracked to look normal
      INT iRedraw = infoPtr->iHotTracked;
      infoPtr->iHotTracked = -1;
      TAB_DrawLoneItemInterior(hwnd, infoPtr, iRedraw);

      // Kill this timer
      KillTimer(hwnd, TAB_HOTTRACK_TIMER);
    }
  }
}

/******************************************************************************
 * TAB_RecalcHotTrack
 *
 * If a tab control has the TCS_HOTTRACK style, then the tab under the mouse
 * should be highlighted.  This function determines which tab in a tab control,
 * if any, is under the mouse and records that information.  The caller may
 * supply output parameters to receive the item number of the tab item which
 * was highlighted but isn't any longer and of the tab item which is now
 * highlighted but wasn't previously.  The caller can use this information to
 * selectively redraw those tab items.
 *
 * If the caller has a mouse position, it can supply it through the pos
 * parameter.  For example, TAB_MouseMove does this.  Otherwise, the caller
 * supplies NULL and this function determines the current mouse position
 * itself.
 */
static void
TAB_RecalcHotTrack
  (
  HWND            hwnd,
  const LPARAM*   pos,
  int*            out_redrawLeave,
  int*            out_redrawEnter
  )
{
  TAB_INFO* infoPtr = TAB_GetInfoPtr(hwnd);

  int item = -1;


  if (out_redrawLeave != NULL)
    *out_redrawLeave = -1;
  if (out_redrawEnter != NULL)
    *out_redrawEnter = -1;

  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_HOTTRACK)
  {
    POINT pt;
    UINT  flags;

    if (pos == NULL)
    {
      GetCursorPos(&pt);
      ScreenToClient(hwnd, &pt);
    }
    else
    {
      pt.x = LOWORD(*pos);
      pt.y = HIWORD(*pos);
    }

    item = TAB_InternalHitTest(hwnd, infoPtr, pt, &flags);
  }

  if (item != infoPtr->iHotTracked)
  {
    if (infoPtr->iHotTracked >= 0)
    {
      // Mark currently hot-tracked to be redrawn to look normal
      if (out_redrawLeave != NULL)
        *out_redrawLeave = infoPtr->iHotTracked;

      if (item < 0)
      {
        // Kill timer which forces recheck of mouse pos
        KillTimer(hwnd, TAB_HOTTRACK_TIMER);
      }
    }
    else
    {
      // Start timer so we recheck mouse pos
      UINT timerID = SetTimer
        (
        hwnd,
        TAB_HOTTRACK_TIMER,
        TAB_HOTTRACK_TIMER_INTERVAL,
        TAB_HotTrackTimerProc
        );

      if (timerID == 0)
        return; /* Hot tracking not available */
    }

    infoPtr->iHotTracked = item;

    if (item >= 0)
    {
      // Mark new hot-tracked to be redrawn to look highlighted
      if (out_redrawEnter != NULL)
        *out_redrawEnter = item;
    }
  }
}

/******************************************************************************
 * TAB_MouseMove
 *
 * Handles the mouse-move event.  Updates tooltips.  Updates hot-tracking.
 */
static LRESULT
TAB_MouseMove (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  int redrawLeave;
  int redrawEnter;

  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

  if (infoPtr->hwndToolTip)
    TAB_RelayEvent (infoPtr->hwndToolTip, hwnd,
                    WM_LBUTTONDOWN, wParam, lParam);

  /* Determine which tab to highlight.  Redraw tabs which change highlight
  ** status. */
  TAB_RecalcHotTrack(hwnd, &lParam, &redrawLeave, &redrawEnter);

  if (redrawLeave != -1)
    TAB_DrawLoneItemInterior(hwnd, infoPtr, redrawLeave);
  if (redrawEnter != -1)
    TAB_DrawLoneItemInterior(hwnd, infoPtr, redrawEnter);

  return 0;
}

/******************************************************************************
 * TAB_AdjustRect
 *
 * Calculates the tab control's display area given the windows rectangle or
 * the window rectangle given the requested display rectangle.
 */
static LRESULT TAB_AdjustRect(
  HWND   hwnd,
  WPARAM fLarger,
  LPRECT prc)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

  if (fLarger)
  {
    /*
     * Go from display rectangle
     */

    /*
     * Add the height of the tabs.
     */
    if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
      prc->bottom += (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;
    else
      prc->top -= (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;

    /*
     * Inflate the rectangle for the padding
     */
    InflateRect(prc, DISPLAY_AREA_PADDINGX, DISPLAY_AREA_PADDINGY);

    /*
     * Inflate for the border
     */
    InflateRect(prc, CONTROL_BORDER_SIZEX, CONTROL_BORDER_SIZEX);
  }
  else
  {
    /*
     * Go from window rectangle.
     */

    /*
     * Deflate the rectangle for the border
     */
    InflateRect(prc, -CONTROL_BORDER_SIZEX, -CONTROL_BORDER_SIZEX);

    /*
     * Deflate the rectangle for the padding
     */
    InflateRect(prc, -DISPLAY_AREA_PADDINGX, -DISPLAY_AREA_PADDINGY);

    /*
     * Remove the height of the tabs.
     */
    if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
      prc->bottom -= (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;
    else
      prc->top += (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;

  }

  return 0;
}

/******************************************************************************
 * TAB_OnHScroll
 *
 * This method will handle the notification from the scroll control and
 * perform the scrolling operation on the tab control.
 */
static LRESULT TAB_OnHScroll(
  HWND    hwnd,
  int     nScrollCode,
  int     nPos,
  HWND    hwndScroll)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

  if(nScrollCode == SB_THUMBPOSITION && nPos != infoPtr->leftmostVisible)
  {
     if(nPos < infoPtr->leftmostVisible)
        infoPtr->leftmostVisible--;
     else
        infoPtr->leftmostVisible++;

     TAB_RecalcHotTrack(hwnd, NULL, NULL, NULL);
     TAB_InvalidateTabArea(hwnd, infoPtr);
     SendMessageA(infoPtr->hwndUpDown, UDM_SETPOS, 0,
                   MAKELONG(infoPtr->leftmostVisible, 0));
   }

   return 0;
}

/******************************************************************************
 * TAB_SetupScrolling
 *
 * This method will check the current scrolling state and make sure the
 * scrolling control is displayed (or not).
 */
static void TAB_SetupScrolling(
  HWND        hwnd,
  TAB_INFO*   infoPtr,
  const RECT* clientRect)
{
  INT maxRange = 0;

  if (infoPtr->needsScrolling)
  {
    RECT controlPos;
    INT vsize, tabwidth;

    /*
     * Calculate the position of the scroll control.
     */
    controlPos.right = clientRect->right;
    controlPos.left  = controlPos.right - 2*GetSystemMetrics(SM_CXHSCROLL);

    if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
    {
      controlPos.top    = clientRect->bottom - infoPtr->tabHeight;
      controlPos.bottom = controlPos.top + GetSystemMetrics(SM_CYHSCROLL);
    }
    else
    {
      controlPos.bottom = clientRect->top + infoPtr->tabHeight;
      controlPos.top    = controlPos.bottom - GetSystemMetrics(SM_CYHSCROLL);
    }

    /*
     * If we don't have a scroll control yet, we want to create one.
     * If we have one, we want to make sure it's positioned right.
     */
    if (infoPtr->hwndUpDown==0)
    {
      /*
       * I use a scrollbar since it seems to be more stable than the Updown
       * control.
       */
      infoPtr->hwndUpDown = CreateWindowA("msctls_updown32",
                                          "",
                                          WS_VISIBLE | WS_CHILD | UDS_HORZ,
                                          controlPos.left, controlPos.top,
                                          controlPos.right - controlPos.left,
                                          controlPos.bottom - controlPos.top,
                                          hwnd,
                                          (HMENU)NULL,
                                          (HINSTANCE)NULL,
                                          NULL);
    }
    else
    {
      SetWindowPos(infoPtr->hwndUpDown,
                   (HWND)NULL,
                   controlPos.left, controlPos.top,
                   controlPos.right - controlPos.left,
                   controlPos.bottom - controlPos.top,
                   SWP_SHOWWINDOW | SWP_NOZORDER);
    }

    /* Now calculate upper limit of the updown control range.
     * We do this by calculating how many tabs will be offscreen when the
     * last tab is visible.
     */
    if(infoPtr->uNumItem)
    {
       vsize = clientRect->right - (controlPos.right - controlPos.left + 1);
       maxRange = infoPtr->uNumItem;
       tabwidth = infoPtr->items[maxRange-1].rect.right;

       for(; maxRange > 0; maxRange--)
       {
          if(tabwidth - infoPtr->items[maxRange - 1].rect.left > vsize)
             break;
       }

       if(maxRange == infoPtr->uNumItem)
          maxRange--;
    }
  }
  else
  {
    /*
     * If we once had a scroll control... hide it.
     */
    if (infoPtr->hwndUpDown!=0)
    {
      ShowWindow(infoPtr->hwndUpDown, SW_HIDE);
    }
  }

  if (infoPtr->hwndUpDown)
     SendMessageA(infoPtr->hwndUpDown, UDM_SETRANGE32, 0, maxRange);
}

/******************************************************************************
 * TAB_SetItemBounds
 *
 * This method will calculate the position rectangles of all the items in the
 * control. The rectangle calculated starts at 0 for the first item in the
 * list and ignores scrolling and selection.
 * It also uses the current font to determine the height of the tab row and
 * it checks if all the tabs fit in the client area of the window. If they
 * dont, a scrolling control is added.
 */
static void TAB_SetItemBounds (HWND hwnd)
{
  TAB_INFO*   infoPtr = TAB_GetInfoPtr(hwnd);
  LONG        lStyle  = GetWindowLongA(hwnd, GWL_STYLE);
  TEXTMETRICA fontMetrics;
  INT         curItem;
  INT         curItemLeftPos;
  INT         curItemRowCount;
  HFONT       hFont, hOldFont;
  HDC         hdc;
  RECT        clientRect;
  SIZE        size;

  /*
   * We need to get text information so we need a DC and we need to select
   * a font.
   */
  hdc = GetDC(hwnd);

  hFont = infoPtr->hFont ? infoPtr->hFont : GetStockObject (SYSTEM_FONT);
  hOldFont = SelectObject (hdc, hFont);

  /*
   * We will base the rectangle calculations on the client rectangle
   * of the control.
   */
  GetClientRect(hwnd, &clientRect);

  /*
   * The leftmost item will be "0" aligned
   */
  curItemLeftPos = 0;
  curItemRowCount = 0;

  if (!(lStyle & TCS_FIXEDWIDTH) && !((lStyle & TCS_OWNERDRAWFIXED) && infoPtr->fSizeSet))
  {
    int item_height;
    int icon_height = 0;

    /*
     * Use the current font to determine the height of a tab.
     */
    GetTextMetricsA(hdc, &fontMetrics);

    /*
     * Get the icon height
     */
    if (infoPtr->himl)
      ImageList_GetIconSize(infoPtr->himl, 0, &icon_height);

    /*
     * Take the highest between font or icon
     */
    if (fontMetrics.tmHeight > icon_height)
      item_height = fontMetrics.tmHeight;
    else
      item_height = icon_height;

    /*
     * Make sure there is enough space for the letters + icon + growing the
     * selected item + extra space for the selected item.
     */
    infoPtr->tabHeight = item_height + 2*VERTICAL_ITEM_PADDING +
      SELECTED_TAB_OFFSET;
  }

  for (curItem = 0; curItem < infoPtr->uNumItem; curItem++)
  {
    /*
     * Set the leftmost position of the tab.
     */
    infoPtr->items[curItem].rect.left = curItemLeftPos;

    if ((lStyle & TCS_FIXEDWIDTH) || ((lStyle & TCS_OWNERDRAWFIXED) && infoPtr->fSizeSet))
    {
      infoPtr->items[curItem].rect.right = infoPtr->items[curItem].rect.left +
                                           infoPtr->tabWidth +
                                           2*HORIZONTAL_ITEM_PADDING;
    }
    else
    {
      int icon_width  = 0;
      int num = 2;

      /*
       * Calculate how wide the tab is depending on the text it contains
       */
      GetTextExtentPoint32W(hdc, infoPtr->items[curItem].pszText,
                            lstrlenW(infoPtr->items[curItem].pszText), &size);

      /*
       * Add the icon width
       */
      if (infoPtr->himl)
      {
        ImageList_GetIconSize(infoPtr->himl, &icon_width, 0);
        num++;
      }

      infoPtr->items[curItem].rect.right = infoPtr->items[curItem].rect.left +
                                           size.cx + icon_width +
                                           num*HORIZONTAL_ITEM_PADDING;
    }

    /*
     * Check if this is a multiline tab control and if so
     * check to see if we should wrap the tabs
     *
     * Because we are going to arange all these tabs evenly
     * really we are basically just counting rows at this point
     *
     */

    if ((lStyle & TCS_MULTILINE)&&
        (infoPtr->items[curItem].rect.right > clientRect.right))
    {
        infoPtr->items[curItem].rect.right -=
                                      infoPtr->items[curItem].rect.left;
        infoPtr->items[curItem].rect.left = 0;
        curItemRowCount ++;
    }

    infoPtr->items[curItem].rect.bottom = 0;
    infoPtr->items[curItem].rect.top = curItemRowCount;

//    TRACE("TextSize: %i\n ", size.cx);
//    TRACE("Rect: T %i, L %i, B %i, R %i\n",
//        infoPtr->items[curItem].rect.top,
//        infoPtr->items[curItem].rect.left,
//        infoPtr->items[curItem].rect.bottom,
//        infoPtr->items[curItem].rect.right);

    /*
     * The leftmost position of the next item is the rightmost position
     * of this one.
     */
    if (lStyle & TCS_BUTTONS)
      curItemLeftPos = infoPtr->items[curItem].rect.right + BUTTON_SPACINGX;
    else
      curItemLeftPos = infoPtr->items[curItem].rect.right;
  }

  if (!(lStyle & TCS_MULTILINE))
  {
    /*
     * Check if we need a scrolling control.
     */
    infoPtr->needsScrolling = (curItemLeftPos + (2*SELECTED_TAB_OFFSET) >
                               clientRect.right);

    /* Don't need scrolling, then update infoPtr->leftmostVisible */
    if(!infoPtr->needsScrolling)
      infoPtr->leftmostVisible = 0;

    TAB_SetupScrolling(hwnd, infoPtr, &clientRect);
  }

  /*
   * Set the number of rows
   */

  infoPtr->uNumRows = curItemRowCount;

   if ((lStyle & TCS_MULTILINE)&&(infoPtr->uNumItem > 0))
   {
      INT widthDiff,remainder;
      INT tabPerRow,remTab;
      INT iRow,iItm;
      INT iIndexStart=0,iIndexEnd=0, iCount=0;

      /*
       * Ok Microsoft trys to even out the rows. place the same
       * number of tabs in each row. So lets give that a shot
       *
       */

      tabPerRow = infoPtr->uNumItem / (infoPtr->uNumRows + 1);
      remTab = infoPtr->uNumItem % (infoPtr->uNumRows + 1);

      for (iItm=0,iRow=0,iCount=0,curItemLeftPos=0;
           iItm<infoPtr->uNumItem;
           iItm++,iCount++)
      {
          if (iCount >= ((iRow<remTab)?tabPerRow+1:tabPerRow))
          {
              iRow++;
              curItemLeftPos = 0;
              iCount = 0;
          }
          /*
           * normalize the current rect
           */
          infoPtr->items[iItm].rect.right -=
            infoPtr->items[iItm].rect.left;
          infoPtr->items[iItm].rect.left = 0;

          infoPtr->items[iItm].rect.top = iRow;
          infoPtr->items[iItm].rect.left +=curItemLeftPos;
          infoPtr->items[iItm].rect.right +=curItemLeftPos;
          if (lStyle & TCS_BUTTONS)
            curItemLeftPos = infoPtr->items[iItm].rect.right +
                             BUTTON_SPACINGX;
          else
            curItemLeftPos = infoPtr->items[iItm].rect.right;
      }

      /*
       * Justify the rows
       *
       */
      {
         while(iIndexStart < infoPtr->uNumItem)
        {
        /*
         * find the indexs of the row
         */
        for (iIndexEnd=iIndexStart;
             (iIndexEnd < infoPtr->uNumItem) &&
               (infoPtr->items[iIndexEnd].rect.top ==
                infoPtr->items[iIndexStart].rect.top) ;
            iIndexEnd++)
        /* intentionaly blank */;

        /*
         * we need to justify these tabs so they fill the whole given
         * client area
         *
         */
        widthDiff = clientRect.right - (2*SELECTED_TAB_OFFSET) -
                            infoPtr->items[iIndexEnd-1].rect.right;

        iCount = iIndexEnd-iIndexStart;

        if (iCount)
        {
           INT iIndex;
           remainder = widthDiff % iCount;
           widthDiff = widthDiff / iCount;
           for (iIndex=iIndexStart,iCount=0; iIndex < iIndexEnd;
                iIndex++,iCount++)
           {
              infoPtr->items[iIndex].rect.left +=iCount*widthDiff;
              infoPtr->items[iIndex].rect.right +=(iCount+1)*widthDiff;
           }
           infoPtr->items[iIndex-1].rect.right += remainder;
        }

        iIndexStart=iIndexEnd;
        }
      }
  }

  TAB_EnsureSelectionVisible(hwnd,infoPtr);
  TAB_RecalcHotTrack(hwnd, NULL, NULL, NULL);

  /*
   * Cleanup
   */
  SelectObject (hdc, hOldFont);
  ReleaseDC (hwnd, hdc);
}

/******************************************************************************
 * TAB_DrawItemInterior
 *
 * This method is used to draw the interior (text and icon) of a single tab
 * into the tab control.
 */
static void
TAB_DrawItemInterior
  (
  HWND        hwnd,
  HDC         hdc,
  INT         iItem,
  RECT*       drawRect
  )
{
  TAB_INFO* infoPtr = TAB_GetInfoPtr(hwnd);
  LONG      lStyle  = GetWindowLongA(hwnd, GWL_STYLE);

  RECT localRect;

  HPEN   htextPen   = GetSysColorPen (COLOR_BTNTEXT);
  HPEN   holdPen;
  INT    oldBkMode;

  if (drawRect == NULL)
  {
    BOOL isVisible;
    RECT itemRect;
    RECT selectedRect;

    /*
     * Get the rectangle for the item.
     */
    isVisible = TAB_InternalGetItemRect
      (
      hwnd,
      infoPtr,
      iItem,
      &itemRect,
      &selectedRect
      );
    if (!isVisible)
      return;

    /*
     * Make sure drawRect points to something valid; simplifies code.
     */
    drawRect = &localRect;

    /*
     * This logic copied from the part of TAB_DrawItem which draws
     * the tab background.  It's important to keep it in sync.  I
     * would have liked to avoid code duplication, but couldn't figure
     * out how without making spaghetti of TAB_DrawItem.
     */
    if (lStyle & TCS_BUTTONS)
    {
      *drawRect = itemRect;
      if (iItem == infoPtr->iSelected)
      {
        drawRect->right--;
        drawRect->bottom--;
      }
    }
    else
    {
      if (iItem == infoPtr->iSelected)
        *drawRect = selectedRect;
      else
        *drawRect = itemRect;
      drawRect->right--;
      drawRect->bottom--;
    }
  }

  /*
   * Text pen
   */
  holdPen = SelectObject(hdc, htextPen);

  oldBkMode = SetBkMode(hdc, TRANSPARENT);
  SetTextColor
    (
    hdc,
    GetSysColor
      (
      (iItem == infoPtr->iHotTracked) ? COLOR_HIGHLIGHT : COLOR_BTNTEXT
      )
    );

  /*
   * Deflate the rectangle to acount for the padding
   */
  InflateRect(drawRect, -HORIZONTAL_ITEM_PADDING, -VERTICAL_ITEM_PADDING);

  /*
   * if owner draw, tell the owner to draw
   */
  if ( (lStyle & TCS_OWNERDRAWFIXED) && GetParent(hwnd) )
  {
    DRAWITEMSTRUCT dis;
    UINT id;

    /*
     * get the control id
     */
    id = GetWindowLongA(hwnd,GWL_ID);

    /*
     * put together the DRAWITEMSTRUCT
     */
    dis.CtlType    = ODT_TAB;   
    dis.CtlID      = id;                
    dis.itemID     = iItem;             
    dis.itemAction = ODA_DRAWENTIRE;    
    if ( iItem == infoPtr->iSelected )
      dis.itemState = ODS_SELECTED;     
    else                                
      dis.itemState = 0;                
    dis.hwndItem = hwnd;                /* */
    dis.hDC      = hdc;         
    dis.rcItem   = *drawRect;           /* */
    dis.itemData = infoPtr->items[iItem].lParam;

    /*
     * send the draw message
     */
    SendMessageA( GetParent(hwnd), WM_DRAWITEM, (WPARAM)id, (LPARAM)&dis );
  }
  else
  {
    UINT uHorizAlign;

    /*
     * If not owner draw, then do the drawing ourselves.
     *
     * Draw the icon.
     */
    if (infoPtr->himl && (infoPtr->items[iItem].mask & TCIF_IMAGE))
    {
      INT cx;
      INT cy;

      ImageList_Draw
        (
        infoPtr->himl,
        infoPtr->items[iItem].iImage,
        hdc,
        drawRect->left,
        drawRect->top + 1,
        ILD_NORMAL
        );
      ImageList_GetIconSize(infoPtr->himl, &cx, &cy);
      drawRect->left += (cx + HORIZONTAL_ITEM_PADDING);
    }

    /*
     * Draw the text;
     */
    if (lStyle & TCS_RIGHTJUSTIFY)
      uHorizAlign = DT_CENTER;
    else
      uHorizAlign = DT_LEFT;

    DrawTextW
      (
      hdc,
      infoPtr->items[iItem].pszText,
      lstrlenW(infoPtr->items[iItem].pszText),
      drawRect,
      uHorizAlign | DT_SINGLELINE | DT_VCENTER
      );
  }

  /*
  * Cleanup
  */
  SetBkMode(hdc, oldBkMode);
  SelectObject(hdc, holdPen);
}

/******************************************************************************
 * TAB_DrawItem
 *
 * This method is used to draw a single tab into the tab control.
 */
static void TAB_DrawItem(
  HWND hwnd,
  HDC  hdc,
  INT  iItem)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  LONG      lStyle  = GetWindowLongA(hwnd, GWL_STYLE);
  RECT      itemRect;
  RECT      selectedRect;
  BOOL      isVisible;
  RECT      r;

  /*
   * Get the rectangle for the item.
   */
  isVisible = TAB_InternalGetItemRect(hwnd,
                                      infoPtr,
                                      iItem,
                                      &itemRect,
                                      &selectedRect);

  if (isVisible)
  {
    HBRUSH hbr       = CreateSolidBrush (GetSysColor(COLOR_BTNFACE));
    HPEN   hwPen     = GetSysColorPen (COLOR_3DHILIGHT);
    HPEN   hbPen     = GetSysColorPen (COLOR_BTNSHADOW);
    HPEN   hfocusPen = CreatePen(PS_DOT, 1, GetSysColor(COLOR_BTNTEXT));
    HPEN   holdPen;
    INT    oldBkMode;
    BOOL deleteBrush = TRUE;

    if (lStyle & TCS_BUTTONS)
    {
      /*
       * Get item rectangle.
       */
      r = itemRect;

      holdPen = SelectObject (hdc, hwPen);

      if (iItem == infoPtr->iSelected)
      {
        /*
         * Background color.
         */
        if (!((lStyle & TCS_OWNERDRAWFIXED) && infoPtr->fSizeSet))
        {
          COLORREF bk = GetSysColor(COLOR_3DHILIGHT);
          DeleteObject(hbr);
          hbr = GetSysColorBrush(COLOR_SCROLLBAR);
          SetTextColor(hdc, GetSysColor(COLOR_3DFACE));
          SetBkColor(hdc, bk);

          /* if COLOR_WINDOW happens to be the same as COLOR_3DHILIGHT
           * we better use 0x55aa bitmap brush to make scrollbar's background
           * look different from the window background.
           */
          if (bk == GetSysColor(COLOR_WINDOW))
              hbr = GetPattern55AABrush();

          deleteBrush = FALSE;
        }

        /*
         * Erase the background.
         */
        FillRect(hdc, &r, hbr);

        /*
         * Draw the tab now.
         * The rectangles calculated exclude the right and bottom
         * borders of the rectangle. To simply the following code, those
         * borders are shaved-off beforehand.
         */
        r.right--;
        r.bottom--;

        /* highlight */
        MoveToEx (hdc, r.left, r.bottom, NULL);
        LineTo   (hdc, r.right, r.bottom);
        LineTo   (hdc, r.right, r.top);

        /* shadow */
        SelectObject(hdc, hbPen);
        LineTo  (hdc, r.left, r.top);
        LineTo  (hdc, r.left, r.bottom);
      }
      else
      {
        /*
         * Erase the background.
         */
        FillRect(hdc, &r, hbr);

        /* highlight */
        MoveToEx (hdc, r.left, r.bottom, NULL);
        LineTo   (hdc, r.left, r.top);
        LineTo   (hdc, r.right, r.top);

        /* shadow */
        SelectObject(hdc, hbPen);
        LineTo  (hdc, r.right, r.bottom);
        LineTo  (hdc, r.left, r.bottom);
      }
    }
    else
    {
      /*
       * Background color.
       */
      DeleteObject(hbr);
      hbr = CreateSolidBrush(GetSysColor(COLOR_BTNFACE));

      /*
       * We draw a rectangle of different sizes depending on the selection
       * state.
       */
      if (iItem == infoPtr->iSelected)
        r = selectedRect;
      else
        r = itemRect;

      /*
       * Erase the background.
       * This is necessary when drawing the selected item since it is larger
       * than the others, it might overlap with stuff already drawn by the
       * other tabs
       */
      FillRect(hdc, &r, hbr);

      /*
       * Draw the tab now.
       * The rectangles calculated exclude the right and bottom
       * borders of the rectangle. To simply the following code, those
       * borders are shaved-off beforehand.
       */
      r.right--;
      r.bottom--;

      holdPen = SelectObject (hdc, hwPen);

      if (lStyle & TCS_BOTTOM)
      {
        /* highlight */
        MoveToEx (hdc, r.left, r.top, NULL);
        LineTo   (hdc, r.left, r.bottom - ROUND_CORNER_SIZE);
        LineTo   (hdc, r.left + ROUND_CORNER_SIZE, r.bottom);

        /* shadow */
        SelectObject(hdc, hbPen);
        LineTo  (hdc, r.right - ROUND_CORNER_SIZE, r.bottom);
        LineTo  (hdc, r.right, r.bottom - ROUND_CORNER_SIZE);
        LineTo  (hdc, r.right, r.top);
      }
      else
      {
        /* highlight */
        MoveToEx (hdc, r.left, r.bottom, NULL);
        LineTo   (hdc, r.left, r.top + ROUND_CORNER_SIZE);
        LineTo   (hdc, r.left + ROUND_CORNER_SIZE, r.top);
        LineTo   (hdc, r.right - ROUND_CORNER_SIZE, r.top);

        /* shadow */
        SelectObject(hdc, hbPen);
        LineTo (hdc, r.right,  r.top + ROUND_CORNER_SIZE);
        LineTo (hdc, r.right,  r.bottom);
      }
    }

    oldBkMode = SetBkMode(hdc, TRANSPARENT);

    /* This modifies r to be the text rectangle. */
    TAB_DrawItemInterior(hwnd, hdc, iItem, &r);

    /*
     * Draw the focus rectangle
     */
    if (((lStyle & TCS_FOCUSNEVER) == 0) &&
         (GetFocus() == hwnd) &&
         (iItem == infoPtr->uFocus) )
    {
      InflateRect(&r, FOCUS_RECT_HOFFSET, FOCUS_RECT_VOFFSET);

      SelectObject(hdc, hfocusPen);

      MoveToEx (hdc, r.left,    r.top, NULL);
      LineTo   (hdc, r.right-1, r.top);
      LineTo   (hdc, r.right-1, r.bottom -1);
      LineTo   (hdc, r.left,    r.bottom -1);
      LineTo   (hdc, r.left,    r.top);
    }

    /*
     * Cleanup
     */
    SetBkMode(hdc, oldBkMode);
    SelectObject(hdc, holdPen);
    DeleteObject(hfocusPen);
    if (deleteBrush) DeleteObject(hbr);
  }
}

/******************************************************************************
 * TAB_DrawBorder
 *
 * This method is used to draw the raised border around the tab control
 * "content" area.
 */
static void TAB_DrawBorder (HWND hwnd, HDC hdc)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  HPEN htmPen;
  HPEN hwPen  = GetSysColorPen (COLOR_3DHILIGHT);
  HPEN hbPen  = GetSysColorPen (COLOR_3DDKSHADOW);
  HPEN hShade = GetSysColorPen (COLOR_BTNSHADOW);
  RECT rect;

  GetClientRect (hwnd, &rect);

  /*
   * Adjust for the style
   */
  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
  {
    rect.bottom -= (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;
  }
  else
  {
    rect.top += (infoPtr->tabHeight - 2) * (infoPtr->uNumRows + 1) + 2;
  }

  /*
   * Shave-off the right and bottom margins (exluded in the
   * rect)
   */
  rect.right--;
  rect.bottom--;

  /* highlight */
  htmPen = SelectObject (hdc, hwPen);

  MoveToEx (hdc, rect.left, rect.bottom, NULL);
  LineTo (hdc, rect.left, rect.top);
  LineTo (hdc, rect.right, rect.top);

  /* Dark Shadow */
  SelectObject (hdc, hbPen);
  LineTo (hdc, rect.right, rect.bottom );
  LineTo (hdc, rect.left, rect.bottom);

  /* shade */
  SelectObject (hdc, hShade );
  MoveToEx (hdc, rect.right-1, rect.top, NULL);
  LineTo   (hdc, rect.right-1, rect.bottom-1);
  LineTo   (hdc, rect.left,    rect.bottom-1);

  SelectObject(hdc, htmPen);
}

/******************************************************************************
 * TAB_Refresh
 *
 * This method repaints the tab control..
 */
static void TAB_Refresh (HWND hwnd, HDC hdc)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  HFONT hOldFont;
  INT i;

  if (!infoPtr->DoRedraw)
    return;

  hOldFont = SelectObject (hdc, infoPtr->hFont);

  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BUTTONS)
  {
    for (i = 0; i < infoPtr->uNumItem; i++)
    {
        TAB_DrawItem (hwnd, hdc, i);
    }
  }
  else
  {
    /*
     * Draw all the non selected item first.
     */
    for (i = 0; i < infoPtr->uNumItem; i++)
    {
      if (i != infoPtr->iSelected)
        TAB_DrawItem (hwnd, hdc, i);
    }

    /*
     * Now, draw the border, draw it before the selected item
     * since the selected item overwrites part of the border.
     */
    TAB_DrawBorder (hwnd, hdc);

    /*
     * Then, draw the selected item
     */
    TAB_DrawItem (hwnd, hdc, infoPtr->iSelected);

    /*
     * If we haven't set the current focus yet, set it now.
     * Only happens when we first paint the tab controls.
     */
     if (infoPtr->uFocus == -1)
       TAB_SetCurFocus(hwnd, infoPtr->iSelected);
  }

  SelectObject (hdc, hOldFont);
}

static LRESULT
TAB_SetRedraw (HWND hwnd, WPARAM wParam)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

  infoPtr->DoRedraw=(BOOL) wParam;
  return 0;
}

static LRESULT TAB_EraseBackground(
  HWND hwnd,
  HDC  givenDC)
{
  HDC  hdc;
  RECT clientRect;

  HBRUSH brush = CreateSolidBrush(GetSysColor(COLOR_BTNFACE));

  hdc = givenDC ? givenDC : GetDC(hwnd);

  GetClientRect(hwnd, &clientRect);

  FillRect(hdc, &clientRect, brush);

  if (givenDC==0)
    ReleaseDC(hwnd, hdc);

  DeleteObject(brush);

  return 0;
}

/******************************************************************************
 * TAB_EnsureSelectionVisible
 *
 * This method will make sure that the current selection is completely
 * visible by scrolling until it is.
 */
static void TAB_EnsureSelectionVisible(
  HWND      hwnd,
  TAB_INFO* infoPtr)
{
  INT iSelected = infoPtr->iSelected;

  INT iOrigLeftmostVisible = infoPtr->leftmostVisible;

  /*
   * set the items row to the bottommost row or topmost row depending on
   * style
   */

  if (infoPtr->uNumRows > 0)
  {
      INT newselected=infoPtr->items[iSelected].rect.top;
      INT iTargetRow;
      LONG lStyle = GetWindowLongA(hwnd, GWL_STYLE);

      if (lStyle & TCS_BOTTOM)
          iTargetRow = 0;
      else
          iTargetRow = infoPtr->uNumRows;

      if (newselected != iTargetRow)
      {
         INT i;
         for (i=0; i < infoPtr->uNumItem; i++)
             if (infoPtr->items[i].rect.top == newselected )
                 infoPtr->items[i].rect.top = iTargetRow;
             else if (lStyle&TCS_BOTTOM)
                 {
                  if (infoPtr->items[i].rect.top < newselected)
                     infoPtr->items[i].rect.top+=1;
                 }
                 else
                 {
                   if (infoPtr->items[i].rect.top > newselected)
                     infoPtr->items[i].rect.top-=1;
                 }

        TAB_RecalcHotTrack(hwnd, NULL, NULL, NULL);
      }
  }

  /*
   * Do the trivial cases first.
   */
  if ( (!infoPtr->needsScrolling) ||
       (infoPtr->hwndUpDown==0) )
    return;

  if (infoPtr->leftmostVisible >= iSelected)
  {
    infoPtr->leftmostVisible = iSelected;
  }
  else
  {
     RECT r;
     INT  width, i;
     /*
      * Calculate the part of the client area that is visible.
      */
     GetClientRect(hwnd, &r);
     width = r.right;

     GetClientRect(infoPtr->hwndUpDown, &r);
     width -= r.right;

     if ((infoPtr->items[iSelected].rect.right -
          infoPtr->items[iSelected].rect.left) >= width )
     {
        /* Special case: width of selected item is greater than visible
         * part of control.
         */
        infoPtr->leftmostVisible = iSelected;
     }
     else
     {
        for (i = infoPtr->leftmostVisible; i < infoPtr->uNumItem; i++)
        {
           if ((infoPtr->items[iSelected].rect.right -
                infoPtr->items[i].rect.left) < width)
              break;
        }
        infoPtr->leftmostVisible = i;
     }
  }

  if (infoPtr->leftmostVisible != iOrigLeftmostVisible)
    TAB_RecalcHotTrack(hwnd, NULL, NULL, NULL);

  SendMessageA(infoPtr->hwndUpDown, UDM_SETPOS, 0,
               MAKELONG(infoPtr->leftmostVisible, 0));
}

/******************************************************************************
 * TAB_InvalidateTabArea
 *
 * This method will invalidate the portion of the control that contains the
 * tabs. It is called when the state of the control changes and needs
 * to be redisplayed
 */
static void TAB_InvalidateTabArea(
  HWND      hwnd,
  TAB_INFO* infoPtr)
{
  RECT clientRect;

  GetClientRect(hwnd, &clientRect);

  if (GetWindowLongA(hwnd, GWL_STYLE) & TCS_BOTTOM)
  {
    clientRect.top = clientRect.bottom - (infoPtr->tabHeight *
                                           (infoPtr->uNumRows + 1) + 3);
  }
  else
  {
    clientRect.bottom = clientRect.top + (infoPtr->tabHeight *
                                           (infoPtr->uNumRows + 1) + 1);
  }

  InvalidateRect(hwnd, &clientRect, TRUE);
}

static LRESULT
TAB_Paint (HWND hwnd, WPARAM wParam)
{
  HDC hdc;
  PAINTSTRUCT ps;

  hdc = wParam== 0 ? BeginPaint (hwnd, &ps) : (HDC)wParam;
  TAB_Refresh (hwnd, hdc);

  if(!wParam)
    EndPaint (hwnd, &ps);

  return 0;
}

static LRESULT TAB_InsertItemA (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  TCITEMA *pti;
  INT iItem, len;
  RECT rect;

  GetClientRect (hwnd, &rect);
//  TRACE(tab, "Rect: %x T %i, L %i, B %i, R %i\n", hwnd,
//        rect.top, rect.left, rect.bottom, rect.right);

  pti = (TCITEMA *)lParam;
  iItem = (INT)wParam;

  if (iItem < 0) return -1;
  if (iItem > infoPtr->uNumItem)
    iItem = infoPtr->uNumItem;

  if (infoPtr->uNumItem == 0) {
    infoPtr->items = (TAB_ITEM*)COMCTL32_Alloc (sizeof (TAB_ITEM));
    infoPtr->uNumItem++;
    infoPtr->iSelected = 0;
  }
  else {
    TAB_ITEM *oldItems = infoPtr->items;

    infoPtr->uNumItem++;
    infoPtr->items = (TAB_ITEM*)COMCTL32_Alloc (sizeof (TAB_ITEM) * infoPtr->uNumItem);

    /* pre insert copy */
    if (iItem > 0) {
      memcpy (&infoPtr->items[0], &oldItems[0],
              iItem * sizeof(TAB_ITEM));
    }

    /* post insert copy */
    if (iItem < infoPtr->uNumItem - 1) {
      memcpy (&infoPtr->items[iItem+1], &oldItems[iItem],
              (infoPtr->uNumItem - iItem - 1) * sizeof(TAB_ITEM));

    }

    if (iItem <= infoPtr->iSelected)
      infoPtr->iSelected++;

    COMCTL32_Free (oldItems);
  }

  infoPtr->items[iItem].mask = pti->mask;
  if (pti->mask & TCIF_TEXT) {
    len = lstrlenA (pti->pszText);
    infoPtr->items[iItem].pszText = (WCHAR*)COMCTL32_Alloc ((len+1)*sizeof(WCHAR));
    lstrcpyAtoW (infoPtr->items[iItem].pszText, pti->pszText);
    infoPtr->items[iItem].cchTextMax = pti->cchTextMax;
  }

  if (pti->mask & TCIF_IMAGE)
    infoPtr->items[iItem].iImage = pti->iImage;

  if (pti->mask & TCIF_PARAM)
    infoPtr->items[iItem].lParam = pti->lParam;

  TAB_SetItemBounds(hwnd);
  TAB_InvalidateTabArea(hwnd, infoPtr);

//  TRACE(tab, "[%04x]: added item %d '%s'\n",
//      hwnd, iItem, infoPtr->items[iItem].pszText);

  return iItem;
}

static LRESULT TAB_InsertItemW(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  TCITEMW *pti;
  INT iItem, len;
  RECT rect;

  GetClientRect (hwnd, &rect);
//  TRACE(tab, "Rect: %x T %i, L %i, B %i, R %i\n", hwnd,
//        rect.top, rect.left, rect.bottom, rect.right);

  pti = (TCITEMW*)lParam;
  iItem = (INT)wParam;

  if (iItem < 0) return -1;
  if (iItem > infoPtr->uNumItem)
    iItem = infoPtr->uNumItem;

  if (infoPtr->uNumItem == 0) {
    infoPtr->items = (TAB_ITEM*)COMCTL32_Alloc (sizeof (TAB_ITEM));
    infoPtr->uNumItem++;
  }
  else {
    TAB_ITEM *oldItems = infoPtr->items;

    infoPtr->uNumItem++;
    infoPtr->items = (TAB_ITEM*)COMCTL32_Alloc (sizeof (TAB_ITEM) * infoPtr->uNumItem);

    /* pre insert copy */
    if (iItem > 0) {
      memcpy (&infoPtr->items[0], &oldItems[0],
              iItem * sizeof(TAB_ITEM));
    }

    /* post insert copy */
    if (iItem < infoPtr->uNumItem - 1) {
      memcpy (&infoPtr->items[iItem+1], &oldItems[iItem],
              (infoPtr->uNumItem - iItem - 1) * sizeof(TAB_ITEM));

    }

    COMCTL32_Free (oldItems);
  }

  infoPtr->items[iItem].mask = pti->mask;
  if (pti->mask & TCIF_TEXT) {
    len = lstrlenW (pti->pszText);
    infoPtr->items[iItem].pszText = (WCHAR*)COMCTL32_Alloc ((len+1)*sizeof(WCHAR));
    lstrcpyW (infoPtr->items[iItem].pszText, pti->pszText);
    infoPtr->items[iItem].cchTextMax = pti->cchTextMax;
  }

  if (pti->mask & TCIF_IMAGE)
    infoPtr->items[iItem].iImage = pti->iImage;

  if (pti->mask & TCIF_PARAM)
    infoPtr->items[iItem].lParam = pti->lParam;

  TAB_SetItemBounds(hwnd);
  TAB_InvalidateTabArea(hwnd, infoPtr);

//  TRACE(tab, "[%04x]: added item %d '%s'\n",
//      hwnd, iItem, infoPtr->items[iItem].pszText);

  return iItem;
}

static LRESULT
TAB_SetItemSize (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  LONG lStyle = GetWindowLongA(hwnd, GWL_STYLE);
  LONG lResult = 0;

  if ((lStyle & TCS_FIXEDWIDTH) || (lStyle & TCS_OWNERDRAWFIXED))
  {
    lResult = MAKELONG(infoPtr->tabWidth, infoPtr->tabHeight);
    infoPtr->tabWidth = (INT)LOWORD(lParam);
    infoPtr->tabHeight = (INT)HIWORD(lParam);
  }

  infoPtr->fSizeSet = TRUE;

  return lResult;
}

static LRESULT
TAB_SetItemA (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  TCITEMA *tabItem;
  TAB_ITEM *wineItem;
  INT    iItem,len;

  iItem=(INT) wParam;
  tabItem=(LPTCITEMA ) lParam;
//  TRACE("%d %p\n",iItem, tabItem);
  if ((iItem<0) || (iItem>infoPtr->uNumItem)) return FALSE;

  wineItem=& infoPtr->items[iItem];

  if (tabItem->mask & TCIF_IMAGE)
    wineItem->iImage=tabItem->iImage;

  if (tabItem->mask & TCIF_PARAM)
    wineItem->lParam=tabItem->lParam;

//  if (tabItem->mask & TCIF_RTLREADING)
//    FIXME("TCIF_RTLREADING\n");

  if (tabItem->mask & TCIF_STATE)
    wineItem->dwState=tabItem->dwState;

  if (tabItem->mask & TCIF_TEXT) {
   len=lstrlenA (tabItem->pszText);
   if (len > wineItem->cchTextMax)
     wineItem->pszText = (WCHAR*)COMCTL32_ReAlloc(wineItem->pszText,(len+1)*sizeof(WCHAR));
   lstrcpyAtoW(wineItem->pszText,tabItem->pszText);
  }

  /*
   * Update and repaint tabs.
   */
  TAB_SetItemBounds(hwnd);
  TAB_InvalidateTabArea(hwnd,infoPtr);

  return TRUE;
}

static LRESULT TAB_SetItemW (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  TCITEMW *tabItem;
  TAB_ITEM *wineItem;
  INT    iItem,len;

  iItem=(INT) wParam;
  tabItem=(LPTCITEMW) lParam;
//  TRACE (tab,"%d %p\n",iItem, tabItem);
  if ((iItem<0) || (iItem>infoPtr->uNumItem)) return FALSE;

  wineItem=& infoPtr->items[iItem];

  if (tabItem->mask & TCIF_IMAGE)
    wineItem->iImage=tabItem->iImage;

  if (tabItem->mask & TCIF_PARAM)
    wineItem->lParam=tabItem->lParam;

//  if (tabItem->mask & TCIF_RTLREADING)
//    FIXME (tab,"TCIF_RTLREADING\n");

  if (tabItem->mask & TCIF_STATE)
    wineItem->dwState=tabItem->dwState;

  if (tabItem->mask & TCIF_TEXT) {
   len = lstrlenW (tabItem->pszText);
   if (len>wineItem->cchTextMax)
     wineItem->pszText = (WCHAR*)COMCTL32_ReAlloc (wineItem->pszText, (len+1)*sizeof(WCHAR));
   lstrcpyW (wineItem->pszText, tabItem->pszText);
  }

  return TRUE;
}

static LRESULT
TAB_GetItemCount (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
   TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

   return infoPtr->uNumItem;
}


static LRESULT
TAB_GetItemA (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
   TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
   TCITEMA *tabItem;
   TAB_ITEM *wineItem;
   INT    iItem;

  iItem=(INT) wParam;
  tabItem=(LPTCITEMA) lParam;
//  TRACE (tab,"\n");
  if ((iItem<0) || (iItem>=infoPtr->uNumItem)) return FALSE;

  wineItem=& infoPtr->items[iItem];

  if (tabItem->mask & TCIF_IMAGE)
    tabItem->iImage=wineItem->iImage;

  if (tabItem->mask & TCIF_PARAM)
    tabItem->lParam=wineItem->lParam;

//  if (tabItem->mask & TCIF_RTLREADING)
//    FIXME (tab, "TCIF_RTLREADING\n");

  if (tabItem->mask & TCIF_STATE)
    tabItem->dwState=wineItem->dwState;

  if (tabItem->mask & TCIF_TEXT)
   lstrcpynWtoA (tabItem->pszText, wineItem->pszText, tabItem->cchTextMax);

  return TRUE;
}

static LRESULT TAB_GetItemW (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
   TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
   TCITEMW *tabItem;
   TAB_ITEM *wineItem;
   INT    iItem;

  iItem=(INT) wParam;
  tabItem=(LPTCITEMW) lParam;
//  TRACE (tab,"\n");
  if ((iItem<0) || (iItem>infoPtr->uNumItem)) return FALSE;

  wineItem=& infoPtr->items[iItem];

  if (tabItem->mask & TCIF_IMAGE)
    tabItem->iImage=wineItem->iImage;

  if (tabItem->mask & TCIF_PARAM)
    tabItem->lParam=wineItem->lParam;

//  if (tabItem->mask & TCIF_RTLREADING)
//    FIXME (tab, "TCIF_RTLREADING\n");

  if (tabItem->mask & TCIF_STATE)
    tabItem->dwState=wineItem->dwState;

  if (tabItem->mask & TCIF_TEXT)
   lstrcpynW (tabItem->pszText, wineItem->pszText, tabItem->cchTextMax);

  return TRUE;
}

static LRESULT
TAB_DeleteItem (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  INT iItem = (INT) wParam;
  BOOL bResult = FALSE;

  if ((iItem >= 0) && (iItem < infoPtr->uNumItem))
  {
    TAB_ITEM *oldItems = infoPtr->items;

    infoPtr->uNumItem--;
    infoPtr->items = (TAB_ITEM*)COMCTL32_Alloc(sizeof (TAB_ITEM) * infoPtr->uNumItem);

    if (iItem > 0)
      memcpy(&infoPtr->items[0], &oldItems[0], iItem * sizeof(TAB_ITEM));

    if (iItem < infoPtr->uNumItem)
      memcpy(&infoPtr->items[iItem], &oldItems[iItem + 1],
              (infoPtr->uNumItem - iItem) * sizeof(TAB_ITEM));

    COMCTL32_Free (oldItems);

    /*
     * Readjust the selected index.
     */
    if ((iItem == infoPtr->iSelected) && (iItem > 0))
      infoPtr->iSelected--;

    if (iItem < infoPtr->iSelected)
      infoPtr->iSelected--;

    if (infoPtr->uNumItem == 0)
      infoPtr->iSelected = -1;

    /*
     * Reposition and repaint tabs.
     */
    TAB_SetItemBounds(hwnd);
    TAB_InvalidateTabArea(hwnd,infoPtr);

    bResult = TRUE;
  }

  return bResult;
}

static LRESULT
TAB_DeleteAllItems (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
   TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

  COMCTL32_Free (infoPtr->items);
  infoPtr->uNumItem = 0;
  infoPtr->iSelected = -1;
  if (infoPtr->iHotTracked >= 0)
    KillTimer(hwnd, TAB_HOTTRACK_TIMER);
  infoPtr->iHotTracked = -1;

  TAB_SetItemBounds(hwnd);
  TAB_InvalidateTabArea(hwnd,infoPtr);

  return TRUE;
}


static LRESULT
TAB_GetFont (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

//  TRACE (tab,"\n");
  return (LRESULT)infoPtr->hFont;
}

static LRESULT
TAB_SetFont (HWND hwnd, WPARAM wParam, LPARAM lParam)

{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

//  TRACE (tab,"%x %lx\n",wParam, lParam);

  infoPtr->hFont = (HFONT)wParam;

  TAB_SetItemBounds(hwnd);

  TAB_InvalidateTabArea(hwnd, infoPtr);

  return 0;
}


static LRESULT
TAB_GetImageList (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);

//  TRACE (tab,"\n");
  return (LRESULT)infoPtr->himl;
}

static LRESULT
TAB_SetImageList (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
    HIMAGELIST himlPrev;

//    TRACE (tab,"\n");
    himlPrev = infoPtr->himl;
    infoPtr->himl= (HIMAGELIST)lParam;
    return (LRESULT)himlPrev;
}


static LRESULT
TAB_Size (HWND hwnd, WPARAM wParam, LPARAM lParam)

{
/* I'm not really sure what the following code was meant to do.
   This is what it is doing:
   When WM_SIZE is sent with SIZE_RESTORED, the control
   gets positioned in the top left corner.

  RECT parent_rect;
  HWND parent;
  UINT uPosFlags,cx,cy;

  uPosFlags=0;
  if (!wParam) {
    parent = GetParent (hwnd);
    GetClientRect(parent, &parent_rect);
    cx=LOWORD (lParam);
    cy=HIWORD (lParam);
    if (GetWindowLongA(hwnd, GWL_STYLE) & CCS_NORESIZE)
        uPosFlags |= (SWP_NOSIZE | SWP_NOMOVE);

    SetWindowPos (hwnd, 0, parent_rect.left, parent_rect.top,
            cx, cy, uPosFlags | SWP_NOZORDER);
  } else {
//    FIXME (tab,"WM_SIZE flag %x %lx not handled\n", wParam, lParam);
  } */

  /*
   * Recompute the size/position of the tabs.
   */
  TAB_SetItemBounds (hwnd);

  /*
   * Force a repaint of the control.
   */
  InvalidateRect(hwnd, NULL, TRUE);

  return 0;
}


static LRESULT
TAB_Create (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr;
  TEXTMETRICA fontMetrics;
  HDC hdc;
  HFONT hOldFont;
  DWORD dwStyle;

  infoPtr = (TAB_INFO*)initControl(hwnd,sizeof(TAB_INFO));

  infoPtr->uNumItem        = 0;
  infoPtr->uNumRows        = 0;
  infoPtr->hFont           = 0;
  infoPtr->items           = 0;
  infoPtr->hcurArrow       = LoadCursorA (0, IDC_ARROWA);
  infoPtr->iSelected       = -1;
  infoPtr->iHotTracked     = -1;
  infoPtr->uFocus          = -1;
  infoPtr->hwndToolTip     = 0;
  infoPtr->DoRedraw        = TRUE;
  infoPtr->needsScrolling  = FALSE;
  infoPtr->hwndUpDown      = 0;
  infoPtr->leftmostVisible = 0;
  infoPtr->fSizeSet        = FALSE;

  /* The tab control always has the WS_CLIPSIBLINGS style. Even
     if you don't specify in CreateWindow. This is necesary in
     order for paint to work correctly. This follows windows behaviour. */
  dwStyle = GetWindowLongA(hwnd, GWL_STYLE);
  SetWindowLongA(hwnd, GWL_STYLE, dwStyle|WS_CLIPSIBLINGS);


  /* Create tooltip control */
  if (dwStyle & TCS_TOOLTIPS)
    infoPtr->hwndToolTip = createToolTip(hwnd,0,FALSE);

  /*
   * We need to get text information so we need a DC and we need to select
   * a font.
   */
  hdc = GetDC(hwnd);
  hOldFont = SelectObject (hdc, GetStockObject (SYSTEM_FONT));

  /*
   * Use the system font to determine the initial height of a tab.
   */
  GetTextMetricsA(hdc, &fontMetrics);

  /*
   * Make sure there is enough space for the letters + growing the
   * selected item + extra space for the selected item.
   */
  infoPtr->tabHeight = fontMetrics.tmHeight + 2*VERTICAL_ITEM_PADDING +
                       SELECTED_TAB_OFFSET;

  /*
   * Initialize the width of a tab.
   */
  infoPtr->tabWidth = DEFAULT_TAB_WIDTH;

  SelectObject (hdc, hOldFont);
  ReleaseDC(hwnd, hdc);

  return 0;
}

static LRESULT
TAB_Destroy (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
  TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
  INT iItem;

  if (infoPtr->items) {
    for (iItem = 0; iItem < infoPtr->uNumItem; iItem++) {
      if (infoPtr->items[iItem].pszText)
        COMCTL32_Free (infoPtr->items[iItem].pszText);
    }
    COMCTL32_Free (infoPtr->items);
  }

  if (infoPtr->iHotTracked >= 0)
    KillTimer(hwnd, TAB_HOTTRACK_TIMER);

  doneControl(hwnd);

  return 0;
}

static LRESULT TAB_StyleChanged(HWND hwnd,WPARAM wParam,LPARAM lParam)
{
  TAB_SetItemBounds (hwnd);
  InvalidateRect(hwnd, NULL, TRUE);

  return 0;
}

static LRESULT WINAPI
TAB_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  switch (uMsg)
  {
    case TCM_GETIMAGELIST:
      return TAB_GetImageList (hwnd, wParam, lParam);

    case TCM_SETIMAGELIST:
      return TAB_SetImageList (hwnd, wParam, lParam);

    case TCM_GETITEMCOUNT:
      return TAB_GetItemCount (hwnd, wParam, lParam);

    case TCM_GETITEMA:
      return TAB_GetItemA (hwnd, wParam, lParam);

    case TCM_GETITEMW:
      return TAB_GetItemW(hwnd,wParam,lParam);

    case TCM_SETITEMA:
      return TAB_SetItemA (hwnd, wParam, lParam);

    case TCM_SETITEMW:
      return TAB_SetItemW(hwnd,wParam,lParam);

    case TCM_DELETEITEM:
      return TAB_DeleteItem (hwnd, wParam, lParam);

    case TCM_DELETEALLITEMS:
     return TAB_DeleteAllItems (hwnd, wParam, lParam);

    case TCM_GETITEMRECT:
     return TAB_GetItemRect (hwnd, wParam, lParam);

    case TCM_GETCURSEL:
      return TAB_GetCurSel (hwnd);

    case TCM_HITTEST:
      return TAB_HitTest (hwnd, wParam, lParam);

    case TCM_SETCURSEL:
      return TAB_SetCurSel (hwnd, wParam);

    case TCM_INSERTITEMA:
      return TAB_InsertItemA(hwnd,wParam,lParam);

    case TCM_INSERTITEMW:
      return TAB_InsertItemW(hwnd,wParam,lParam);

    case TCM_SETITEMEXTRA:
//      FIXME (tab, "Unimplemented msg TCM_SETITEMEXTRA\n");
      return 0;

    case TCM_ADJUSTRECT:
      return TAB_AdjustRect (hwnd, (BOOL)wParam, (LPRECT)lParam);

    case TCM_SETITEMSIZE:
      return TAB_SetItemSize (hwnd, wParam, lParam);

    case TCM_REMOVEIMAGE:
//      FIXME (tab, "Unimplemented msg TCM_REMOVEIMAGE\n");
      return 0;

    case TCM_SETPADDING:
//      FIXME (tab, "Unimplemented msg TCM_SETPADDING\n");
      return 0;

    case TCM_GETROWCOUNT:
//      FIXME (tab, "Unimplemented msg TCM_GETROWCOUNT\n");
      return 0;

    case TCM_HIGHLIGHTITEM:
//      FIXME (tab, "Unimplemented msg TCM_HIGHLIGHTITEM\n");
      return 0;

    case TCM_GETTOOLTIPS:
      return TAB_GetToolTips (hwnd, wParam, lParam);

    case TCM_SETTOOLTIPS:
      return TAB_SetToolTips (hwnd, wParam, lParam);

    case TCM_GETCURFOCUS:
      return TAB_GetCurFocus (hwnd);

    case TCM_SETCURFOCUS:
      return TAB_SetCurFocus (hwnd, wParam);

    case TCM_SETMINTTABWIDTH:
//      FIXME (tab, "Unimplemented msg TCM_SETMINTTABWIDTH\n");
      return 0;

    case TCM_DESELECTALL:
//      FIXME (tab, "Unimplemented msg TCM_DESELECTALL\n");
      return 0;

    case TCM_GETEXTENDEDSTYLE:
//      FIXME (tab, "Unimplemented msg TCM_GETEXTENDEDSTYLE\n");
      return 0;

    case TCM_SETEXTENDEDSTYLE:
//      FIXME (tab, "Unimplemented msg TCM_SETEXTENDEDSTYLE\n");
      return 0;

    case WM_GETFONT:
      return TAB_GetFont (hwnd, wParam, lParam);

    case WM_SETFONT:
      return TAB_SetFont (hwnd, wParam, lParam);

    case WM_CREATE:
      return TAB_Create (hwnd, wParam, lParam);

    case WM_NCDESTROY:
      return TAB_Destroy (hwnd, wParam, lParam);

    case WM_GETDLGCODE:
      return DLGC_WANTARROWS | DLGC_WANTCHARS;

    case WM_LBUTTONDOWN:
      return TAB_LButtonDown (hwnd, wParam, lParam);

    case WM_LBUTTONUP:
      return TAB_LButtonUp (hwnd, wParam, lParam);

    case WM_RBUTTONDOWN:
      return TAB_RButtonDown (hwnd, wParam, lParam);

    case WM_MOUSEMOVE:
      return TAB_MouseMove (hwnd, wParam, lParam);

    case WM_ERASEBKGND:
      return TAB_EraseBackground (hwnd, (HDC)wParam);

    case WM_PAINT:
      return TAB_Paint (hwnd, wParam);

    case WM_SIZE:
      return TAB_Size (hwnd, wParam, lParam);

    case WM_SETREDRAW:
      return TAB_SetRedraw (hwnd, wParam);

    case WM_HSCROLL:
      return TAB_OnHScroll(hwnd, (int)LOWORD(wParam), (int)HIWORD(wParam), (HWND)lParam);

    case WM_STYLECHANGED:
      return TAB_StyleChanged(hwnd,wParam,lParam);

    case WM_KILLFOCUS:
    case WM_SETFOCUS:
      return TAB_FocusChanging(hwnd, uMsg, wParam, lParam);

    case WM_KEYUP:
      return TAB_KeyUp(hwnd, wParam);

    default:
//      if (uMsg >= WM_USER)
//      ERR (tab, "unknown msg %04x wp=%08x lp=%08lx\n",
//           uMsg, wParam, lParam);
      return defComCtl32ProcA (hwnd, uMsg, wParam, lParam);
  }

  return 0;
}


VOID TAB_Register(VOID)
{
  WNDCLASSA wndClass;

  ZeroMemory (&wndClass, sizeof(WNDCLASSA));
  wndClass.style         = CS_GLOBALCLASS | CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
  wndClass.lpfnWndProc   = (WNDPROC)TAB_WindowProc;
  wndClass.cbClsExtra    = 0;
  wndClass.cbWndExtra    = sizeof(TAB_INFO *);
  wndClass.hCursor       = LoadCursorA (0, IDC_ARROWA);
  wndClass.hbrBackground = (HBRUSH)NULL;
  wndClass.lpszClassName = WC_TABCONTROLA;

  RegisterClassA (&wndClass);
}


VOID TAB_Unregister(VOID)
{
  UnregisterClassA (WC_TABCONTROLA, (HINSTANCE)NULL);
}