text: /*
   * Trackbar control
   *
   * Copyright 1998, 1999 Eric Kohl
   * Copyright 1998, 1999 Alex Priem
   * Copyright 2002 Dimitrie O. Paun
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   *
   * NOTE
   * 
   * This code was audited for completeness against the documented features
   * of Comctl32.dll version 6.0 on Sep. 12, 2002, by Dimitrie O. Paun.
   * 
   * Unless otherwise noted, we believe this code to be complete, as per
   * the specification mentioned above.
   * If you discover missing features, or bugs, please note them below.
   * 
   */
  
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <math.h>
  
  #include "windef.h"
  #include "winbase.h"
  #include "wingdi.h"
  #include "winuser.h"
  #include "winnls.h"
  #include "commctrl.h"
  #include "uxtheme.h"
  #include "vssym32.h"
  #include "wine/debug.h"
  
  #include "comctl32.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(trackbar);
  
  typedef struct
  {
      HWND hwndSelf;
      DWORD dwStyle;
      LONG lRangeMin;
      LONG lRangeMax;
      LONG lLineSize;
      LONG lPageSize;
      LONG lSelMin;
      LONG lSelMax;
      LONG lPos;
      UINT uThumbLen;
      UINT uNumTics;
      UINT uTicFreq;
      HWND hwndNotify;
      HWND hwndToolTip;
      HWND hwndBuddyLA;
      HWND hwndBuddyRB;
      INT  fLocation;
      INT  flags;
      BOOL bUnicode;
      BOOL bFocussed;
      RECT rcChannel;
      RECT rcSelection;
      RECT rcThumb;
      LPLONG tics;
  } TRACKBAR_INFO;
  
  #define TB_REFRESH_TIMER	1
  #define TB_REFRESH_DELAY	500
  
  #define TOOLTIP_OFFSET		2     /* distance from ctrl edge to tooltip */
  
  #define TB_DEFAULTPAGESIZE	20
  
  /* Used by TRACKBAR_Refresh to find out which parts of the control
     need to be recalculated */
  
  #define TB_THUMBPOSCHANGED      1
  #define TB_THUMBSIZECHANGED     2
  #define TB_THUMBCHANGED 	(TB_THUMBPOSCHANGED | TB_THUMBSIZECHANGED)
  #define TB_SELECTIONCHANGED     4
  #define TB_DRAG_MODE            8     /* we're dragging the slider */
  #define TB_AUTO_PAGE_LEFT	16
  #define TB_AUTO_PAGE_RIGHT	32
  #define TB_AUTO_PAGE		(TB_AUTO_PAGE_LEFT | TB_AUTO_PAGE_RIGHT)
  #define TB_THUMB_HOT            64    /* mouse hovers above thumb */
  
  /* helper defines for TRACKBAR_DrawTic */
  #define TIC_EDGE                0x20
  #define TIC_SELECTIONMARKMAX    0x80
  #define TIC_SELECTIONMARKMIN    0x100
  #define TIC_SELECTIONMARK       (TIC_SELECTIONMARKMAX | TIC_SELECTIONMARKMIN)
  
  static const WCHAR themeClass[] = { 'T','r','a','c','k','b','a','r',0 };
  
  static inline int 
  notify_customdraw (const TRACKBAR_INFO *infoPtr, NMCUSTOMDRAW *pnmcd, int stage)
  {
      pnmcd->dwDrawStage = stage;
      return SendMessageW (infoPtr->hwndNotify, WM_NOTIFY, 
  		         pnmcd->hdr.idFrom, (LPARAM)pnmcd);
  }
  
  static LRESULT notify_hdr (const TRACKBAR_INFO *infoPtr, INT code, LPNMHDR pnmh)
  {
      LRESULT result;
      
      TRACE("(code=%d)\n", code);
  
      pnmh->hwndFrom = infoPtr->hwndSelf;
      pnmh->idFrom = GetWindowLongPtrW(infoPtr->hwndSelf, GWLP_ID);
      pnmh->code = code;
      result = SendMessageW(infoPtr->hwndNotify, WM_NOTIFY, pnmh->idFrom, (LPARAM)pnmh);
  
      TRACE("  <= %ld\n", result);
  
      return result;
  }
  
  static inline int notify (const TRACKBAR_INFO *infoPtr, INT code)
  {
      NMHDR nmh;
      return notify_hdr(infoPtr, code, &nmh);
  }
  
  static void notify_with_scroll (const TRACKBAR_INFO *infoPtr, UINT code)
  {
      UINT scroll = infoPtr->dwStyle & TBS_VERT ? WM_VSCROLL : WM_HSCROLL;
  
      TRACE("%x\n", code);
  
      SendMessageW (infoPtr->hwndNotify, scroll, code, (LPARAM)infoPtr->hwndSelf);
  }
  
  static void TRACKBAR_RecalculateTics (TRACKBAR_INFO *infoPtr)
  {
      int tic;
      unsigned nrTics, i;
  
      if (infoPtr->uTicFreq && infoPtr->lRangeMax >= infoPtr->lRangeMin) {
          nrTics=(infoPtr->lRangeMax - infoPtr->lRangeMin)/infoPtr->uTicFreq;
          /* don't add extra tic if there's no remainder */
          if (nrTics && ((infoPtr->lRangeMax - infoPtr->lRangeMin) % infoPtr->uTicFreq == 0))
            nrTics--;
      }
      else {
          Free (infoPtr->tics);
          infoPtr->tics = NULL;
          infoPtr->uNumTics = 0;
          return;
      }
  
      if (nrTics != infoPtr->uNumTics) {
      	infoPtr->tics=ReAlloc (infoPtr->tics,
                                          (nrTics+1)*sizeof (DWORD));
  	if (!infoPtr->tics) {
  	    infoPtr->uNumTics = 0;
  	    notify(infoPtr, NM_OUTOFMEMORY);
  	    return;
  	}
      	infoPtr->uNumTics = nrTics;
      }
  
      tic = infoPtr->lRangeMin + infoPtr->uTicFreq;
      for (i = 0; i < nrTics; i++, tic += infoPtr->uTicFreq)
          infoPtr->tics[i] = tic;
  }
  
  /* converts from physical (mouse) position to logical position
     (in range of trackbar) */
  
  static inline LONG
  TRACKBAR_ConvertPlaceToPosition (const TRACKBAR_INFO *infoPtr, int place)
  {
      double range, width, pos, offsetthumb;
  
      range = infoPtr->lRangeMax - infoPtr->lRangeMin;
      if (infoPtr->dwStyle & TBS_VERT) {
          offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
          width = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - (offsetthumb * 2) - 1;
          pos = (range*(place - infoPtr->rcChannel.top - offsetthumb)) / width;
      } else {
          offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
          width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - (offsetthumb * 2) - 1;
          pos = (range*(place - infoPtr->rcChannel.left - offsetthumb)) / width;
      }
      pos += infoPtr->lRangeMin;
      if (pos > infoPtr->lRangeMax)
          pos = infoPtr->lRangeMax;
      else if (pos < infoPtr->lRangeMin)
          pos = infoPtr->lRangeMin;
  
      TRACE("%.2f\n", pos);
      return (LONG)floor(pos + 0.5);
  }
  
  
  /* return: 0> prev, 0 none, >0 next */
  static LONG
  TRACKBAR_GetAutoPageDirection (const TRACKBAR_INFO *infoPtr, POINT clickPoint)
  {
      RECT pageRect;
  
      if (infoPtr->dwStyle & TBS_VERT) {
  	pageRect.top = infoPtr->rcChannel.top;
  	pageRect.bottom = infoPtr->rcChannel.bottom;
  	pageRect.left = infoPtr->rcThumb.left;
  	pageRect.right = infoPtr->rcThumb.right;
      } else {
  	pageRect.top = infoPtr->rcThumb.top;
  	pageRect.bottom = infoPtr->rcThumb.bottom;
  	pageRect.left = infoPtr->rcChannel.left;
  	pageRect.right = infoPtr->rcChannel.right;
      }
  
  
      if (PtInRect(&pageRect, clickPoint))
      {
  	int clickPlace = (infoPtr->dwStyle & TBS_VERT) ? clickPoint.y : clickPoint.x;
  
          LONG clickPos = TRACKBAR_ConvertPlaceToPosition(infoPtr, clickPlace);
  
  	return clickPos - infoPtr->lPos;
      }
  
      return 0;
  }
  
  static inline void
  TRACKBAR_PageDown (TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->lPos == infoPtr->lRangeMax) return;
  
      infoPtr->lPos += infoPtr->lPageSize;
      if (infoPtr->lPos > infoPtr->lRangeMax)
  	infoPtr->lPos = infoPtr->lRangeMax;
      notify_with_scroll (infoPtr, TB_PAGEDOWN);
  }
  
  
  static inline void
  TRACKBAR_PageUp (TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->lPos == infoPtr->lRangeMin) return;
  
      infoPtr->lPos -= infoPtr->lPageSize;
      if (infoPtr->lPos < infoPtr->lRangeMin)
          infoPtr->lPos = infoPtr->lRangeMin;
      notify_with_scroll (infoPtr, TB_PAGEUP);
  }
  
  static inline void TRACKBAR_LineUp(TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->lPos == infoPtr->lRangeMin) return;
      infoPtr->lPos -= infoPtr->lLineSize;
      if (infoPtr->lPos < infoPtr->lRangeMin)
          infoPtr->lPos = infoPtr->lRangeMin;
      notify_with_scroll (infoPtr, TB_LINEUP);
  }
  
  static inline void TRACKBAR_LineDown(TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->lPos == infoPtr->lRangeMax) return;
      infoPtr->lPos += infoPtr->lLineSize;
      if (infoPtr->lPos > infoPtr->lRangeMax)
          infoPtr->lPos = infoPtr->lRangeMax;
      notify_with_scroll (infoPtr, TB_LINEDOWN);
  }
  
  static void
  TRACKBAR_CalcChannel (TRACKBAR_INFO *infoPtr)
  {
      INT cyChannel, offsetthumb, offsetedge;
      RECT lpRect, *channel = & infoPtr->rcChannel;
  
      GetClientRect (infoPtr->hwndSelf, &lpRect);
  
      offsetthumb = infoPtr->uThumbLen / 4;
      offsetedge  = offsetthumb + 3;
      cyChannel   = (infoPtr->dwStyle & TBS_ENABLESELRANGE) ? offsetthumb*3 : 4;
      if (infoPtr->dwStyle & TBS_VERT) {
          channel->top    = lpRect.top + offsetedge;
          channel->bottom = lpRect.bottom - offsetedge;
          if (infoPtr->dwStyle & TBS_ENABLESELRANGE)
              channel->left = lpRect.left + ((infoPtr->uThumbLen - cyChannel + 2) / 2);
          else
              channel->left = lpRect.left + (infoPtr->uThumbLen / 2) - 1;
          if (infoPtr->dwStyle & TBS_BOTH) {
              if (infoPtr->dwStyle & TBS_NOTICKS)
                  channel->left += 1;
              else
                  channel->left += 9;
          }
          else if (infoPtr->dwStyle & TBS_TOP) {
              if (infoPtr->dwStyle & TBS_NOTICKS)
                  channel->left += 2;
              else
                  channel->left += 10;
          }
          channel->right = channel->left + cyChannel;
      } else {
          channel->left = lpRect.left + offsetedge;
          channel->right = lpRect.right - offsetedge;
          if (infoPtr->dwStyle & TBS_ENABLESELRANGE)
              channel->top = lpRect.top + ((infoPtr->uThumbLen - cyChannel + 2) / 2);
          else
              channel->top = lpRect.top + (infoPtr->uThumbLen / 2) - 1;
          if (infoPtr->dwStyle & TBS_BOTH) {
              if (infoPtr->dwStyle & TBS_NOTICKS)
                  channel->top += 1;
              else
                  channel->top += 9;
          }
          else if (infoPtr->dwStyle & TBS_TOP) {
              if (infoPtr->dwStyle & TBS_NOTICKS)
                  channel->top += 2;
              else
                  channel->top += 10;
          }
          channel->bottom   = channel->top + cyChannel;
      }
  }
  
  static void
  TRACKBAR_CalcThumb (const TRACKBAR_INFO *infoPtr, LONG lPos, RECT *thumb)
  {
      int range, width, height, thumbwidth;
      RECT lpRect;
  
      range = infoPtr->lRangeMax - infoPtr->lRangeMin;
      thumbwidth = (infoPtr->uThumbLen / 2) | 1;
  
      if (!range) range = 1;
  
      GetClientRect(infoPtr->hwndSelf, &lpRect);
      if (infoPtr->dwStyle & TBS_VERT)
      {
      	height = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - thumbwidth;
  
          if ((infoPtr->dwStyle & (TBS_BOTH | TBS_LEFT)) && !(infoPtr->dwStyle & TBS_NOTICKS))
              thumb->left = 10;
          else
              thumb->left = 2;
          thumb->right = thumb->left + infoPtr->uThumbLen;
          thumb->top = infoPtr->rcChannel.top +
                       (height*(lPos - infoPtr->lRangeMin))/range;
          thumb->bottom = thumb->top + thumbwidth;
      }
      else
      {
      	width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - thumbwidth;
  
          thumb->left = infoPtr->rcChannel.left +
                        (width*(lPos - infoPtr->lRangeMin))/range;
          thumb->right = thumb->left + thumbwidth;
          if ((infoPtr->dwStyle & (TBS_BOTH | TBS_TOP)) && !(infoPtr->dwStyle & TBS_NOTICKS))
              thumb->top = 10;
          else
              thumb->top = 2;
          thumb->bottom = thumb->top + infoPtr->uThumbLen;
      }
  }
  
  static inline void
  TRACKBAR_UpdateThumb (TRACKBAR_INFO *infoPtr)
  {
      TRACKBAR_CalcThumb(infoPtr, infoPtr->lPos, &infoPtr->rcThumb);
  }
  
  static inline void
  TRACKBAR_InvalidateAll (const TRACKBAR_INFO *infoPtr)
  {
      InvalidateRect(infoPtr->hwndSelf, NULL, FALSE);
  }
  
  static void
  TRACKBAR_InvalidateThumb (const TRACKBAR_INFO *infoPtr, LONG thumbPos)
  {
      RECT rcThumb;
  
      TRACKBAR_CalcThumb(infoPtr, thumbPos, &rcThumb);
      InflateRect(&rcThumb, 1, 1);
      InvalidateRect(infoPtr->hwndSelf, &rcThumb, FALSE);
  }
  
  static inline void
  TRACKBAR_InvalidateThumbMove (const TRACKBAR_INFO *infoPtr, LONG oldPos, LONG newPos)
  {
      TRACKBAR_InvalidateThumb (infoPtr, oldPos);
      if (newPos != oldPos)
          TRACKBAR_InvalidateThumb (infoPtr, newPos);
  }
  
  static inline BOOL
  TRACKBAR_HasSelection (const TRACKBAR_INFO *infoPtr)
  {
      return infoPtr->lSelMin != infoPtr->lSelMax;
  }
  
  static void
  TRACKBAR_CalcSelection (TRACKBAR_INFO *infoPtr)
  {
      RECT *selection = &infoPtr->rcSelection;
      int range = infoPtr->lRangeMax - infoPtr->lRangeMin;
      int offsetthumb, height, width;
  
      if (range <= 0) {
          SetRectEmpty (selection);
      } else {
          if (infoPtr->dwStyle & TBS_VERT) {
              offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
              height = infoPtr->rcChannel.bottom - infoPtr->rcChannel.top - offsetthumb*2;
              selection->top    = infoPtr->rcChannel.top + offsetthumb +
                  (height*infoPtr->lSelMin)/range;
              selection->bottom = infoPtr->rcChannel.top + offsetthumb +
                  (height*infoPtr->lSelMax)/range;
              selection->left   = infoPtr->rcChannel.left + 3;
              selection->right  = infoPtr->rcChannel.right - 3;
          } else {
              offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
              width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - offsetthumb*2;
              selection->left   = infoPtr->rcChannel.left + offsetthumb +
                  (width*infoPtr->lSelMin)/range;
              selection->right  = infoPtr->rcChannel.left + offsetthumb +
                  (width*infoPtr->lSelMax)/range;
              selection->top    = infoPtr->rcChannel.top + 3;
              selection->bottom = infoPtr->rcChannel.bottom - 3;
          }
      }
  
      TRACE("selection[%s]\n", wine_dbgstr_rect(selection));
  }
  
  static BOOL
  TRACKBAR_AutoPage (TRACKBAR_INFO *infoPtr, POINT clickPoint)
  {
      LONG dir = TRACKBAR_GetAutoPageDirection(infoPtr, clickPoint);
      LONG prevPos = infoPtr->lPos;
  
      TRACE("clickPoint=%s, dir=%d\n", wine_dbgstr_point(&clickPoint), dir);
  
      if (dir > 0 && (infoPtr->flags & TB_AUTO_PAGE_RIGHT))
  	TRACKBAR_PageDown(infoPtr);
      else if (dir < 0 && (infoPtr->flags & TB_AUTO_PAGE_LEFT))
  	TRACKBAR_PageUp(infoPtr);
      else return FALSE;
  
      TRACKBAR_UpdateThumb (infoPtr);
      TRACKBAR_InvalidateThumbMove (infoPtr, prevPos, infoPtr->lPos);
  
      return TRUE;
  }
  
  /* Trackbar drawing code. I like my spaghetti done milanese.  */
  
  static void
  TRACKBAR_DrawChannel (const TRACKBAR_INFO *infoPtr, HDC hdc)
  {
      RECT rcChannel = infoPtr->rcChannel;
      HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
  
      if (theme)
      {
          DrawThemeBackground (theme, hdc, 
              (infoPtr->dwStyle & TBS_VERT) ?
                  TKP_TRACKVERT : TKP_TRACK, TKS_NORMAL, &rcChannel, 0);
      }
      else
      {
          DrawEdge (hdc, &rcChannel, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
          if (infoPtr->dwStyle & TBS_ENABLESELRANGE) {		 /* fill the channel */
              FillRect (hdc, &rcChannel, GetStockObject(WHITE_BRUSH));
              if (TRACKBAR_HasSelection(infoPtr))
                  FillRect (hdc, &infoPtr->rcSelection, GetSysColorBrush(COLOR_HIGHLIGHT));
          }
      }
  }
  
  static void
  TRACKBAR_DrawOneTic (const TRACKBAR_INFO *infoPtr, HDC hdc, LONG ticPos, int flags)
  {
      int x, y, ox, oy, range, side, indent = 0, len = 3;
      int offsetthumb;
      RECT rcTics;
  
      if (flags & TBS_VERT) {
          offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
          SetRect(&rcTics, infoPtr->rcThumb.left - 2, infoPtr->rcChannel.top + offsetthumb,
                  infoPtr->rcThumb.right + 2, infoPtr->rcChannel.bottom - offsetthumb - 1);
      } else {
          offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
          SetRect(&rcTics, infoPtr->rcChannel.left + offsetthumb, infoPtr->rcThumb.top - 2,
                  infoPtr->rcChannel.right - offsetthumb - 1, infoPtr->rcThumb.bottom + 2);
      }
  
      if (flags & (TBS_TOP | TBS_LEFT)) {
  	x = rcTics.left;
  	y = rcTics.top;
  	side = -1;
      } else {
    	x = rcTics.right;
    	y = rcTics.bottom;
  	side = 1;
      }
  
      range = infoPtr->lRangeMax - infoPtr->lRangeMin;
      if (range <= 0)
        range = 1; /* to avoid division by zero */
  
      if (flags & TIC_SELECTIONMARK) {
    	indent = (flags & TIC_SELECTIONMARKMIN) ? -1 : 1;
      } else if (flags & TIC_EDGE) {
  	len++;
      }
  
      if (flags & TBS_VERT) {
  	int height = rcTics.bottom - rcTics.top;
  	y = rcTics.top + (height*(ticPos - infoPtr->lRangeMin))/range;
      } else {
          int width = rcTics.right - rcTics.left;
          x = rcTics.left + (width*(ticPos - infoPtr->lRangeMin))/range;
      }
  
      ox = x;
      oy = y;
      MoveToEx(hdc, x, y, 0);
      if (flags & TBS_VERT) x += len * side;
      else y += len * side;
      LineTo(hdc, x, y);
  	    
      if (flags & TIC_SELECTIONMARK) {
  	if (flags & TBS_VERT) {
  	    x -= side;
  	} else {
  	    y -= side;
  	}
  	MoveToEx(hdc, x, y, 0);
  	if (flags & TBS_VERT) {
  	    y += 2 * indent;
  	} else {
  	    x += 2 * indent;
  	}
  	
  	LineTo(hdc, x, y);
  	LineTo(hdc, ox, oy);
      }
  }
  
  
  static inline void
  TRACKBAR_DrawTic (const TRACKBAR_INFO *infoPtr, HDC hdc, LONG ticPos, int flags)
  {
      if ((flags & (TBS_LEFT | TBS_TOP)) || (flags & TBS_BOTH))
          TRACKBAR_DrawOneTic (infoPtr, hdc, ticPos, flags | TBS_LEFT);
  
      if (!(flags & (TBS_LEFT | TBS_TOP)) || (flags & TBS_BOTH))
          TRACKBAR_DrawOneTic (infoPtr, hdc, ticPos, flags & ~TBS_LEFT);
  }
  
  static void
  TRACKBAR_DrawTics (const TRACKBAR_INFO *infoPtr, HDC hdc)
  {
      unsigned int i;
      int ticFlags = infoPtr->dwStyle & 0x0f;
      LOGPEN ticPen = { PS_SOLID, {1, 0}, GetSysColor (COLOR_3DDKSHADOW) };
      HPEN hOldPen, hTicPen;
      HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
      
      if (theme)
      {
          int part = (infoPtr->dwStyle & TBS_VERT) ? TKP_TICSVERT : TKP_TICS;
          GetThemeColor (theme, part, TSS_NORMAL, TMT_COLOR, &ticPen.lopnColor);
      }
      /* create the pen to draw the tics with */
      hTicPen = CreatePenIndirect(&ticPen);
      hOldPen = hTicPen ? SelectObject(hdc, hTicPen) : 0;
  
      /* actually draw the tics */
      for (i=0; i<infoPtr->uNumTics; i++)
          TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->tics[i], ticFlags);
  
      TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lRangeMin, ticFlags | TIC_EDGE);
      TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lRangeMax, ticFlags | TIC_EDGE);
  
      if ((infoPtr->dwStyle & TBS_ENABLESELRANGE) && TRACKBAR_HasSelection(infoPtr)) {
          TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lSelMin,
                            ticFlags | TIC_SELECTIONMARKMIN);
          TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lSelMax,
                            ticFlags | TIC_SELECTIONMARKMAX);
      }
      
      /* clean up the pen, if we created one */
      if (hTicPen) {
  	SelectObject(hdc, hOldPen);
  	DeleteObject(hTicPen);
      }
  }
  
  static int
  TRACKBAR_FillThumb (const TRACKBAR_INFO *infoPtr, HDC hdc, HBRUSH hbrush)
  {
      const RECT *thumb = &infoPtr->rcThumb;
      POINT points[6];
      int PointDepth;
      HBRUSH oldbr;
  
      if (infoPtr->dwStyle & TBS_BOTH)
      {
          FillRect(hdc, thumb, hbrush);
          return 0;
      }
  
      if (infoPtr->dwStyle & TBS_VERT)
      {
          PointDepth = (thumb->bottom - thumb->top) / 2;
          if (infoPtr->dwStyle & TBS_LEFT)
          {
              points[0].x = thumb->right-1;
              points[0].y = thumb->top;
              points[1].x = thumb->right-1;
              points[1].y = thumb->bottom-1;
              points[2].x = thumb->left + PointDepth;
              points[2].y = thumb->bottom-1;
              points[3].x = thumb->left;
              points[3].y = thumb->top + PointDepth;
              points[4].x = thumb->left + PointDepth;
              points[4].y = thumb->top;
              points[5].x = points[0].x;
              points[5].y = points[0].y;
          }
          else
          {
              points[0].x = thumb->right;
              points[0].y = thumb->top + PointDepth;
              points[1].x = thumb->right - PointDepth;
              points[1].y = thumb->bottom-1;
              points[2].x = thumb->left;
              points[2].y = thumb->bottom-1;
              points[3].x = thumb->left;
              points[3].y = thumb->top;
              points[4].x = thumb->right - PointDepth;
              points[4].y = thumb->top;
              points[5].x = points[0].x;
              points[5].y = points[0].y;
          }
      }
      else
      {
          PointDepth = (thumb->right - thumb->left) / 2;
          if (infoPtr->dwStyle & TBS_TOP)
          {
              points[0].x = thumb->left + PointDepth;
              points[0].y = thumb->top+1;
              points[1].x = thumb->right-1;
              points[1].y = thumb->top + PointDepth + 1;
              points[2].x = thumb->right-1;
              points[2].y = thumb->bottom-1;
              points[3].x = thumb->left;
              points[3].y = thumb->bottom-1;
              points[4].x = thumb->left;
              points[4].y = thumb->top + PointDepth + 1;
              points[5].x = points[0].x;
              points[5].y = points[0].y;
          }
          else
          {
              points[0].x = thumb->right-1;
              points[0].y = thumb->top;
              points[1].x = thumb->right-1;
              points[1].y = thumb->bottom - PointDepth - 1;
              points[2].x = thumb->left + PointDepth;
              points[2].y = thumb->bottom-1;
              points[3].x = thumb->left;
              points[3].y = thumb->bottom - PointDepth - 1;
              points[4].x = thumb->left;
              points[4].y = thumb->top;
              points[5].x = points[0].x;
              points[5].y = points[0].y;
          }
      }
  
      oldbr = SelectObject(hdc, hbrush);
      SetPolyFillMode(hdc, WINDING);
      Polygon(hdc, points, sizeof(points) / sizeof(points[0]));
      SelectObject(hdc, oldbr);
  
      return PointDepth;
  }
  
  static void
  TRACKBAR_DrawThumb (TRACKBAR_INFO *infoPtr, HDC hdc)
  {
      HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
      int PointDepth;
      HBRUSH brush;
  
      if (theme)
      {
          int partId;
          int stateId;
          if (infoPtr->dwStyle & TBS_BOTH)
              partId = (infoPtr->dwStyle & TBS_VERT) ? TKP_THUMBVERT : TKP_THUMB;
          else if (infoPtr->dwStyle & TBS_LEFT)
              partId = (infoPtr->dwStyle & TBS_VERT) ? TKP_THUMBLEFT : TKP_THUMBTOP;
          else
              partId = (infoPtr->dwStyle & TBS_VERT) ? TKP_THUMBRIGHT : TKP_THUMBBOTTOM;
              
          if (infoPtr->dwStyle & WS_DISABLED)
              stateId = TUS_DISABLED;
          else if (infoPtr->flags & TB_DRAG_MODE)
              stateId = TUS_PRESSED;
          else if (infoPtr->flags & TB_THUMB_HOT)
              stateId = TUS_HOT;
          else
              stateId = TUS_NORMAL;
          
          DrawThemeBackground (theme, hdc, partId, stateId, &infoPtr->rcThumb, NULL);
          
          return;
      }
  
      if (infoPtr->dwStyle & WS_DISABLED || infoPtr->flags & TB_DRAG_MODE)
      {
          if (comctl32_color.clr3dHilight == comctl32_color.clrWindow)
              brush = COMCTL32_hPattern55AABrush;
          else
              brush = GetSysColorBrush(COLOR_SCROLLBAR);
  
          SetTextColor(hdc, comctl32_color.clr3dFace);
          SetBkColor(hdc, comctl32_color.clr3dHilight);
      }
      else
          brush = GetSysColorBrush(COLOR_BTNFACE);
  
      PointDepth = TRACKBAR_FillThumb(infoPtr, hdc, brush);
  
      if (infoPtr->dwStyle & TBS_BOTH)
      {
         DrawEdge(hdc, &infoPtr->rcThumb, EDGE_RAISED, BF_RECT | BF_SOFT);
         return;
      }
      else
      {
          RECT thumb = infoPtr->rcThumb;
  
          if (infoPtr->dwStyle & TBS_VERT)
          {
            if (infoPtr->dwStyle & TBS_LEFT)
            {
              /* rectangular part */
              thumb.left += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_TOP | BF_RIGHT | BF_BOTTOM | BF_SOFT);
  
              /* light edge */
              thumb.left -= PointDepth;
              thumb.right = thumb.left + PointDepth;
              thumb.bottom = infoPtr->rcThumb.top + PointDepth + 1;
              thumb.top = infoPtr->rcThumb.top;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDTOPRIGHT | BF_SOFT);
  
              /* shadowed edge */
              thumb.top += PointDepth;
              thumb.bottom += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_SUNKEN, BF_DIAGONAL_ENDTOPLEFT | BF_SOFT);
              return;
            }
            else
            {
              /* rectangular part */
              thumb.right -= PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_TOP | BF_LEFT | BF_BOTTOM | BF_SOFT);
  
              /* light edge */
              thumb.left = thumb.right;
              thumb.right += PointDepth + 1;
              thumb.bottom = infoPtr->rcThumb.top + PointDepth + 1;
              thumb.top = infoPtr->rcThumb.top;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDTOPLEFT | BF_SOFT);
  
              /* shadowed edge */
              thumb.top += PointDepth;
              thumb.bottom += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDBOTTOMLEFT | BF_SOFT);
            }
          }
          else
          {
            if (infoPtr->dwStyle & TBS_TOP)
            {
              /* rectangular part */
              thumb.top += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_LEFT | BF_BOTTOM | BF_RIGHT | BF_SOFT);
  
              /* light edge */
              thumb.left = infoPtr->rcThumb.left;
              thumb.right = thumb.left + PointDepth;
              thumb.bottom = infoPtr->rcThumb.top + PointDepth + 1;
              thumb.top -= PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDTOPRIGHT | BF_SOFT);
  
              /* shadowed edge */
              thumb.left += PointDepth;
              thumb.right += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDBOTTOMRIGHT | BF_SOFT);
            }
            else
            {
              /* rectangular part */
              thumb.bottom -= PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_LEFT | BF_TOP | BF_RIGHT | BF_SOFT);
  
              /* light edge */
              thumb.left = infoPtr->rcThumb.left;
              thumb.right = thumb.left + PointDepth;
              thumb.top = infoPtr->rcThumb.bottom - PointDepth - 1;
              thumb.bottom += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDTOPLEFT | BF_SOFT);
  
              /* shadowed edge */
              thumb.left += PointDepth;
              thumb.right += PointDepth;
              DrawEdge(hdc, &thumb, EDGE_RAISED, BF_DIAGONAL_ENDBOTTOMLEFT | BF_SOFT);
            }
          }
      }
  }
  
  
  static inline void
  TRACKBAR_ActivateToolTip (const TRACKBAR_INFO *infoPtr, BOOL fShow)
  {
      TTTOOLINFOW ti;
  
      if (!infoPtr->hwndToolTip) return;
  
      ZeroMemory(&ti, sizeof(ti));
      ti.cbSize = sizeof(ti);
      ti.hwnd   = infoPtr->hwndSelf;
  
      SendMessageW (infoPtr->hwndToolTip, TTM_TRACKACTIVATE, fShow, (LPARAM)&ti);
  }
  
  
  static void
  TRACKBAR_UpdateToolTip (const TRACKBAR_INFO *infoPtr)
  {
      WCHAR buf[80];
      static const WCHAR fmt[] = { '%', 'l', 'd', 0 };
      TTTOOLINFOW ti;
      POINT pt;
      RECT rcClient;
      LRESULT size;
  
      if (!infoPtr->hwndToolTip) return;
  
      ZeroMemory(&ti, sizeof(ti));
      ti.cbSize = sizeof(ti);
      ti.hwnd   = infoPtr->hwndSelf;
      ti.uFlags = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;
  
      wsprintfW (buf, fmt, infoPtr->lPos);
      ti.lpszText = buf;
      SendMessageW (infoPtr->hwndToolTip, TTM_UPDATETIPTEXTW, 0, (LPARAM)&ti);
  
      GetClientRect (infoPtr->hwndSelf, &rcClient);
      size = SendMessageW (infoPtr->hwndToolTip, TTM_GETBUBBLESIZE, 0, (LPARAM)&ti);
      if (infoPtr->dwStyle & TBS_VERT) {
  	if (infoPtr->fLocation == TBTS_LEFT)
  	    pt.x = 0 - LOWORD(size) - TOOLTIP_OFFSET;
  	else
  	    pt.x = rcClient.right + TOOLTIP_OFFSET;
      	pt.y = (infoPtr->rcThumb.top + infoPtr->rcThumb.bottom - HIWORD(size))/2;
      } else {
  	if (infoPtr->fLocation == TBTS_TOP)
  	    pt.y = 0 - HIWORD(size) - TOOLTIP_OFFSET;
  	else
              pt.y = rcClient.bottom + TOOLTIP_OFFSET;
          pt.x = (infoPtr->rcThumb.left + infoPtr->rcThumb.right - LOWORD(size))/2;
      }
      ClientToScreen(infoPtr->hwndSelf, &pt);
  
      SendMessageW (infoPtr->hwndToolTip, TTM_TRACKPOSITION,
                    0, MAKELPARAM(pt.x, pt.y));
  }
  
  
  static void
  TRACKBAR_Refresh (TRACKBAR_INFO *infoPtr, HDC hdcDst)
  {
      RECT rcClient;
      HDC hdc;
      HBITMAP hOldBmp = 0, hOffScreenBmp = 0;
      NMCUSTOMDRAW nmcd;
      int gcdrf, icdrf;
  
      if (infoPtr->flags & TB_THUMBCHANGED) {
          TRACKBAR_UpdateThumb (infoPtr);
          if (infoPtr->flags & TB_THUMBSIZECHANGED)
              TRACKBAR_CalcChannel (infoPtr);
      }
      if (infoPtr->flags & TB_SELECTIONCHANGED)
          TRACKBAR_CalcSelection (infoPtr);
  
      if (infoPtr->flags & TB_DRAG_MODE)
          TRACKBAR_UpdateToolTip (infoPtr);
  
      infoPtr->flags &= ~ (TB_THUMBCHANGED | TB_SELECTIONCHANGED);
  
      GetClientRect (infoPtr->hwndSelf, &rcClient);
      
      /* try to render offscreen, if we fail, carrry onscreen */
      hdc = CreateCompatibleDC(hdcDst);
      if (hdc) {
          hOffScreenBmp = CreateCompatibleBitmap(hdcDst, rcClient.right, rcClient.bottom);
          if (hOffScreenBmp) {
  	    hOldBmp = SelectObject(hdc, hOffScreenBmp);
  	} else {
  	    DeleteObject(hdc);
  	    hdc = hdcDst;
  	}
      } else {
  	hdc = hdcDst;
      }
  
      ZeroMemory(&nmcd, sizeof(nmcd));
      nmcd.hdr.hwndFrom = infoPtr->hwndSelf;
      nmcd.hdr.idFrom = GetWindowLongPtrW (infoPtr->hwndSelf, GWLP_ID);
      nmcd.hdr.code = NM_CUSTOMDRAW;
      nmcd.hdc = hdc;
  
      /* start the paint cycle */
      nmcd.rc = rcClient;
      gcdrf = notify_customdraw(infoPtr, &nmcd, CDDS_PREPAINT);
      if (gcdrf & CDRF_SKIPDEFAULT) goto cleanup;
      
      /* Erase background */
      if (gcdrf == CDRF_DODEFAULT ||
          notify_customdraw(infoPtr, &nmcd, CDDS_PREERASE) != CDRF_SKIPDEFAULT) {
          if (GetWindowTheme (infoPtr->hwndSelf)) {
              DrawThemeParentBackground (infoPtr->hwndSelf, hdc, 0);
          }
          else {
              HBRUSH brush = (HBRUSH)SendMessageW(infoPtr->hwndNotify, WM_CTLCOLORSTATIC,
                      (WPARAM)hdc, (LPARAM)infoPtr->hwndSelf);
              FillRect (hdc, &rcClient, brush ? brush : GetSysColorBrush(COLOR_BTNFACE));
          }
          if (gcdrf != CDRF_DODEFAULT)
  	    notify_customdraw(infoPtr, &nmcd, CDDS_POSTERASE);
      }
      
      /* draw channel */
      if (gcdrf & CDRF_NOTIFYITEMDRAW) {
          nmcd.dwItemSpec = TBCD_CHANNEL;
  	nmcd.uItemState = CDIS_DEFAULT;
  	nmcd.rc = infoPtr->rcChannel;
  	icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
      } else icdrf = CDRF_DODEFAULT;
      if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
  	TRACKBAR_DrawChannel (infoPtr, hdc);
  	if (icdrf & CDRF_NOTIFYPOSTPAINT)
  	    notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
      }
  
  
      /* draw tics */
      if (!(infoPtr->dwStyle & TBS_NOTICKS)) {
      	if (gcdrf & CDRF_NOTIFYITEMDRAW) {
              nmcd.dwItemSpec = TBCD_TICS;
  	    nmcd.uItemState = CDIS_DEFAULT;
  	    nmcd.rc = rcClient;
  	    icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
          } else icdrf = CDRF_DODEFAULT;
  	if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
  	    TRACKBAR_DrawTics (infoPtr, hdc);
  	    if (icdrf & CDRF_NOTIFYPOSTPAINT)
  		notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
  	}
      }
      
      /* draw thumb */
      if (!(infoPtr->dwStyle & TBS_NOTHUMB)) {
  	if (gcdrf & CDRF_NOTIFYITEMDRAW) {
  	    nmcd.dwItemSpec = TBCD_THUMB;
  	    nmcd.uItemState = infoPtr->flags & TB_DRAG_MODE ? CDIS_HOT : CDIS_DEFAULT;
  	    nmcd.rc = infoPtr->rcThumb;
  	    icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
  	} else icdrf = CDRF_DODEFAULT;
  	if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
              TRACKBAR_DrawThumb(infoPtr, hdc);
  	    if (icdrf & CDRF_NOTIFYPOSTPAINT)
  		notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
  	}
      }
  
      /* draw focus rectangle */
      if (infoPtr->bFocussed) {
  	DrawFocusRect(hdc, &rcClient);
      }
  
      /* finish up the painting */
      if (gcdrf & CDRF_NOTIFYPOSTPAINT)
  	notify_customdraw(infoPtr, &nmcd, CDDS_POSTPAINT);
      
  cleanup:
      /* cleanup, if we rendered offscreen */
      if (hdc != hdcDst) {
  	BitBlt(hdcDst, 0, 0, rcClient.right, rcClient.bottom, hdc, 0, 0, SRCCOPY);
  	SelectObject(hdc, hOldBmp);
  	DeleteObject(hOffScreenBmp);
  	DeleteObject(hdc);
      }
  }
  
  
  static void
  TRACKBAR_AlignBuddies (const TRACKBAR_INFO *infoPtr)
  {
      HWND hwndParent = GetParent (infoPtr->hwndSelf);
      RECT rcSelf, rcBuddy;
      INT x, y;
  
      GetWindowRect (infoPtr->hwndSelf, &rcSelf);
      MapWindowPoints (HWND_DESKTOP, hwndParent, (LPPOINT)&rcSelf, 2);
  
      /* align buddy left or above */
      if (infoPtr->hwndBuddyLA) {
  	GetWindowRect (infoPtr->hwndBuddyLA, &rcBuddy);
  	MapWindowPoints (HWND_DESKTOP, hwndParent, (LPPOINT)&rcBuddy, 2);
  
  	if (infoPtr->dwStyle & TBS_VERT) {
  	    x = (infoPtr->rcChannel.right + infoPtr->rcChannel.left) / 2 -
  		(rcBuddy.right - rcBuddy.left) / 2 + rcSelf.left;
  	    y = rcSelf.top - (rcBuddy.bottom - rcBuddy.top);
  	}
  	else {
  	    x = rcSelf.left - (rcBuddy.right - rcBuddy.left);
  	    y = (infoPtr->rcChannel.bottom + infoPtr->rcChannel.top) / 2 -
  		(rcBuddy.bottom - rcBuddy.top) / 2 + rcSelf.top;
  	}
  
  	SetWindowPos (infoPtr->hwndBuddyLA, 0, x, y, 0, 0,
                        SWP_NOZORDER | SWP_NOSIZE);
      }
  
  
      /* align buddy right or below */
      if (infoPtr->hwndBuddyRB) {
  	GetWindowRect (infoPtr->hwndBuddyRB, &rcBuddy);
  	MapWindowPoints (HWND_DESKTOP, hwndParent, (LPPOINT)&rcBuddy, 2);
  
  	if (infoPtr->dwStyle & TBS_VERT) {
  	    x = (infoPtr->rcChannel.right + infoPtr->rcChannel.left) / 2 -
  		(rcBuddy.right - rcBuddy.left) / 2 + rcSelf.left;
  	    y = rcSelf.bottom;
  	}
  	else {
  	    x = rcSelf.right;
  	    y = (infoPtr->rcChannel.bottom + infoPtr->rcChannel.top) / 2 -
  		(rcBuddy.bottom - rcBuddy.top) / 2 + rcSelf.top;
  	}
  	SetWindowPos (infoPtr->hwndBuddyRB, 0, x, y, 0, 0,
                        SWP_NOZORDER | SWP_NOSIZE);
      }
  }
  
  
  static LRESULT
  TRACKBAR_ClearSel (TRACKBAR_INFO *infoPtr, BOOL fRedraw)
  {
      infoPtr->lSelMin = 0;
      infoPtr->lSelMax = 0;
      infoPtr->flags |= TB_SELECTIONCHANGED;
  
      if (fRedraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_ClearTics (TRACKBAR_INFO *infoPtr, BOOL fRedraw)
  {
      if (infoPtr->tics) {
          Free (infoPtr->tics);
          infoPtr->tics = NULL;
          infoPtr->uNumTics = 0;
      }
  
      if (fRedraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_GetChannelRect (const TRACKBAR_INFO *infoPtr, LPRECT lprc)
  {
      if (lprc == NULL) return 0;
  
      lprc->left   = infoPtr->rcChannel.left;
      lprc->right  = infoPtr->rcChannel.right;
      lprc->bottom = infoPtr->rcChannel.bottom;
      lprc->top    = infoPtr->rcChannel.top;
  
      return 0;
  }
  
  
  static inline LONG
  TRACKBAR_GetNumTics (const TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->dwStyle & TBS_NOTICKS) return 0;
  
      return infoPtr->uNumTics + 2;
  }
  
  
  static int comp_tics (const void *ap, const void *bp)
  {
      const DWORD a = *(const DWORD *)ap;
      const DWORD b = *(const DWORD *)bp;
  
      TRACE("(a=%d, b=%d)\n", a, b);
      if (a < b) return -1;
      if (a > b) return 1;
      return 0;
  }
  
  
  static inline LONG
  TRACKBAR_GetTic (const TRACKBAR_INFO *infoPtr, INT iTic)
  {
      if ((iTic < 0) || (iTic >= infoPtr->uNumTics) || !infoPtr->tics)
  	return -1;
  
      qsort(infoPtr->tics, infoPtr->uNumTics, sizeof(DWORD), comp_tics);
      return infoPtr->tics[iTic];
  }
  
  
  static inline LONG
  TRACKBAR_GetTicPos (const TRACKBAR_INFO *infoPtr, INT iTic)
  {
      LONG range, width, pos, tic;
      int offsetthumb;
  
      if ((iTic < 0) || (iTic >= infoPtr->uNumTics) || !infoPtr->tics)
  	return -1;
  
      tic   = TRACKBAR_GetTic (infoPtr, iTic);
      range = infoPtr->lRangeMax - infoPtr->lRangeMin;
      if (range <= 0) range = 1;
      offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
      width = infoPtr->rcChannel.right - infoPtr->rcChannel.left - offsetthumb*2;
      pos   = infoPtr->rcChannel.left + offsetthumb + (width * tic) / range;
  
      return pos;
  }
  
  
  static HWND
  TRACKBAR_SetBuddy (TRACKBAR_INFO *infoPtr, BOOL fLocation, HWND hwndBuddy)
  {
      HWND hwndTemp;
  
      if (fLocation) {
  	/* buddy is left or above */
  	hwndTemp = infoPtr->hwndBuddyLA;
  	infoPtr->hwndBuddyLA = hwndBuddy;
      }
      else {
          /* buddy is right or below */
          hwndTemp = infoPtr->hwndBuddyRB;
          infoPtr->hwndBuddyRB = hwndBuddy;
      }
  
      TRACKBAR_AlignBuddies (infoPtr);
  
      return hwndTemp;
  }
  
  
  static inline LONG
  TRACKBAR_SetLineSize (TRACKBAR_INFO *infoPtr, LONG lLineSize)
  {
      LONG lTemp = infoPtr->lLineSize;
  
      infoPtr->lLineSize = lLineSize;
  
      return lTemp;
  }
  
  
  static inline LONG
  TRACKBAR_SetPageSize (TRACKBAR_INFO *infoPtr, LONG lPageSize)
  {
      LONG lTemp = infoPtr->lPageSize;
  
      if (lPageSize != -1)
          infoPtr->lPageSize = lPageSize;
      else
          infoPtr->lPageSize = TB_DEFAULTPAGESIZE;
  
      return lTemp;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetPos (TRACKBAR_INFO *infoPtr, BOOL fPosition, LONG lPosition)
  {
      LONG oldPos = infoPtr->lPos;
      infoPtr->lPos = lPosition;
  
      if (infoPtr->lPos < infoPtr->lRangeMin)
  	infoPtr->lPos = infoPtr->lRangeMin;
  
      if (infoPtr->lPos > infoPtr->lRangeMax)
  	infoPtr->lPos = infoPtr->lRangeMax;
  
      if (fPosition && oldPos != lPosition)
      {
          TRACKBAR_UpdateThumb(infoPtr);
          TRACKBAR_InvalidateThumbMove(infoPtr, oldPos, lPosition);
      }
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetRange (TRACKBAR_INFO *infoPtr, BOOL redraw, LONG range)
  {
      BOOL changed = infoPtr->lRangeMin != (SHORT)LOWORD(range) ||
                     infoPtr->lRangeMax != (SHORT)HIWORD(range);
  
      infoPtr->lRangeMin = (SHORT)LOWORD(range);
      infoPtr->lRangeMax = (SHORT)HIWORD(range);
  
      /* clip position to new min/max limit */
      if (infoPtr->lPos < infoPtr->lRangeMin)
          infoPtr->lPos = infoPtr->lRangeMin;
  
      if (infoPtr->lPos > infoPtr->lRangeMax)
          infoPtr->lPos = infoPtr->lRangeMax;
  
      infoPtr->lPageSize = (infoPtr->lRangeMax - infoPtr->lRangeMin) / 5;
      if (infoPtr->lPageSize == 0) infoPtr->lPageSize = 1;
  
      if (changed) {
          if (infoPtr->dwStyle & TBS_AUTOTICKS)
              TRACKBAR_RecalculateTics (infoPtr);
          infoPtr->flags |= TB_THUMBPOSCHANGED;
      }
  
      if (redraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetRangeMax (TRACKBAR_INFO *infoPtr, BOOL redraw, LONG lMax)
  {
      BOOL changed = infoPtr->lRangeMax != lMax;
      LONG rightmost = max(lMax, infoPtr->lRangeMin);
  
      infoPtr->lRangeMax = lMax;
      if (infoPtr->lPos > rightmost) {
          infoPtr->lPos = rightmost;
          infoPtr->flags |= TB_THUMBPOSCHANGED;
      }
  
      infoPtr->lPageSize = (infoPtr->lRangeMax - infoPtr->lRangeMin) / 5;
      if (infoPtr->lPageSize == 0) infoPtr->lPageSize = 1;
  
      if (changed && (infoPtr->dwStyle & TBS_AUTOTICKS))
          TRACKBAR_RecalculateTics (infoPtr);
  
      if (redraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetRangeMin (TRACKBAR_INFO *infoPtr, BOOL redraw, LONG lMin)
  {
      BOOL changed = infoPtr->lRangeMin != lMin;
  
      infoPtr->lRangeMin = lMin;
      if (infoPtr->lPos < infoPtr->lRangeMin) {
          infoPtr->lPos = infoPtr->lRangeMin;
          infoPtr->flags |= TB_THUMBPOSCHANGED;
      }
  
      infoPtr->lPageSize = (infoPtr->lRangeMax - infoPtr->lRangeMin) / 5;
      if (infoPtr->lPageSize == 0) infoPtr->lPageSize = 1;
  
      if (changed && (infoPtr->dwStyle & TBS_AUTOTICKS))
          TRACKBAR_RecalculateTics (infoPtr);
  
      if (redraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetSel (TRACKBAR_INFO *infoPtr, BOOL fRedraw, LONG lSel)
  {
      if (!(infoPtr->dwStyle & TBS_ENABLESELRANGE)){
          infoPtr->lSelMin = 0;
          infoPtr->lSelMax = 0;
          return 0;
      }
  
      infoPtr->lSelMin = (SHORT)LOWORD(lSel);
      infoPtr->lSelMax = (SHORT)HIWORD(lSel);
      infoPtr->flags |= TB_SELECTIONCHANGED;
  
      if (infoPtr->lSelMin < infoPtr->lRangeMin)
          infoPtr->lSelMin = infoPtr->lRangeMin;
      if (infoPtr->lSelMax > infoPtr->lRangeMax)
          infoPtr->lSelMax = infoPtr->lRangeMax;
  
      if (fRedraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetSelEnd (TRACKBAR_INFO *infoPtr, BOOL fRedraw, LONG lEnd)
  {
      if (!(infoPtr->dwStyle & TBS_ENABLESELRANGE)){
          infoPtr->lSelMax = 0;
  	return 0;
      }
  
      infoPtr->lSelMax = lEnd;
      infoPtr->flags |= TB_SELECTIONCHANGED;
  
      if (infoPtr->lSelMax > infoPtr->lRangeMax)
          infoPtr->lSelMax = infoPtr->lRangeMax;
  
      if (fRedraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetSelStart (TRACKBAR_INFO *infoPtr, BOOL fRedraw, LONG lStart)
  {
      if (!(infoPtr->dwStyle & TBS_ENABLESELRANGE)){
          infoPtr->lSelMin = 0;
  	return 0;
      }
  
      infoPtr->lSelMin = lStart;
      infoPtr->flags  |=TB_SELECTIONCHANGED;
  
      if (infoPtr->lSelMin < infoPtr->lRangeMin)
          infoPtr->lSelMin = infoPtr->lRangeMin;
  
      if (fRedraw) TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetThumbLength (TRACKBAR_INFO *infoPtr, UINT iLength)
  {
      if (infoPtr->dwStyle & TBS_FIXEDLENGTH) {
          /* We're not supposed to check if it's really changed or not,
             just repaint in any case. */
          infoPtr->uThumbLen = iLength;
  	infoPtr->flags |= TB_THUMBSIZECHANGED;
  	TRACKBAR_InvalidateAll(infoPtr);
      }
  
      return 0;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetTic (TRACKBAR_INFO *infoPtr, LONG lPos)
  {
      if ((lPos < infoPtr->lRangeMin) || (lPos> infoPtr->lRangeMax))
          return FALSE;
  
      TRACE("lPos=%d\n", lPos);
  
      infoPtr->uNumTics++;
      infoPtr->tics=ReAlloc( infoPtr->tics,
                                      (infoPtr->uNumTics)*sizeof (DWORD));
      if (!infoPtr->tics) {
  	infoPtr->uNumTics = 0;
  	notify(infoPtr, NM_OUTOFMEMORY);
  	return FALSE;
      }
      infoPtr->tics[infoPtr->uNumTics-1] = lPos;
  
      TRACKBAR_InvalidateAll(infoPtr);
  
      return TRUE;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetTicFreq (TRACKBAR_INFO *infoPtr, WORD wFreq)
  {
      if (infoPtr->dwStyle & TBS_AUTOTICKS) {
          infoPtr->uTicFreq = wFreq;
  	TRACKBAR_RecalculateTics (infoPtr);
  	TRACKBAR_InvalidateAll(infoPtr);
      }
  
      TRACKBAR_UpdateThumb (infoPtr);
      return 0;
  }
  
  
  static inline INT
  TRACKBAR_SetTipSide (TRACKBAR_INFO *infoPtr, INT fLocation)
  {
      INT fTemp = infoPtr->fLocation;
  
      infoPtr->fLocation = fLocation;
  
      return fTemp;
  }
  
  
  static inline LRESULT
  TRACKBAR_SetToolTips (TRACKBAR_INFO *infoPtr, HWND hwndTT)
  {
      infoPtr->hwndToolTip = hwndTT;
  
      return 0;
  }
  
  
  static inline BOOL
  TRACKBAR_SetUnicodeFormat (TRACKBAR_INFO *infoPtr, BOOL fUnicode)
  {
      BOOL bTemp = infoPtr->bUnicode;
  
      infoPtr->bUnicode = fUnicode;
  
      return bTemp;
  }
  
  
  static LRESULT
  TRACKBAR_InitializeThumb (TRACKBAR_INFO *infoPtr)
  {
      RECT rect;
      int clientWidth, clientMetric;
  
      /* initial thumb length */
      clientMetric = (infoPtr->dwStyle & TBS_ENABLESELRANGE) ? 23 : 21;
      GetClientRect(infoPtr->hwndSelf,&rect);
      if (infoPtr->dwStyle & TBS_VERT) {
  	clientWidth = rect.right - rect.left;
      } else {
  	clientWidth = rect.bottom - rect.top;
      }
      if (clientWidth >= clientMetric)
          infoPtr->uThumbLen = clientMetric;
      else
          infoPtr->uThumbLen = clientWidth > 9 ? clientWidth - 6 : 4;
  
      TRACKBAR_CalcChannel (infoPtr);
      TRACKBAR_UpdateThumb (infoPtr);
      infoPtr->flags &= ~TB_SELECTIONCHANGED;
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_Create (HWND hwnd, const CREATESTRUCTW *lpcs)
  {
      TRACKBAR_INFO *infoPtr;
  
      infoPtr = Alloc (sizeof(TRACKBAR_INFO));
      if (!infoPtr) return -1;
      SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
  
      /* set default values */
      infoPtr->hwndSelf  = hwnd;
      infoPtr->dwStyle   = lpcs->style;
      infoPtr->lRangeMin = 0;
      infoPtr->lRangeMax = 100;
      infoPtr->lLineSize = 1;
      infoPtr->lPageSize = TB_DEFAULTPAGESIZE;
      infoPtr->lSelMin   = 0;
      infoPtr->lSelMax   = 0;
      infoPtr->lPos      = 0;
      infoPtr->fLocation = TBTS_TOP;
      infoPtr->uNumTics  = 0;    /* start and end tic are not included in count*/
      infoPtr->uTicFreq  = 1;
      infoPtr->tics      = NULL;
      infoPtr->hwndNotify= lpcs->hwndParent;
  
      TRACKBAR_InitializeThumb (infoPtr);
  
      /* Create tooltip control */
      if (infoPtr->dwStyle & TBS_TOOLTIPS) {
  
      	infoPtr->hwndToolTip =
              CreateWindowExW (0, TOOLTIPS_CLASSW, NULL, WS_POPUP,
                               CW_USEDEFAULT, CW_USEDEFAULT,
                               CW_USEDEFAULT, CW_USEDEFAULT,
                               hwnd, 0, 0, 0);
  
      	if (infoPtr->hwndToolTip) {
              TTTOOLINFOW ti;
              WCHAR wEmpty = 0;
              ZeroMemory (&ti, sizeof(ti));
              ti.cbSize   = sizeof(ti);
       	    ti.uFlags   = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;
  	    ti.hwnd     = hwnd;
              ti.lpszText = &wEmpty;
  
              SendMessageW (infoPtr->hwndToolTip, TTM_ADDTOOLW, 0, (LPARAM)&ti);
  	 }
      }
      
      OpenThemeData (hwnd, themeClass);
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_Destroy (TRACKBAR_INFO *infoPtr)
  {
      /* delete tooltip control */
      if (infoPtr->hwndToolTip)
      	DestroyWindow (infoPtr->hwndToolTip);
  
      Free (infoPtr->tics);
      infoPtr->tics = NULL;
  
      SetWindowLongPtrW (infoPtr->hwndSelf, 0, 0);
      CloseThemeData (GetWindowTheme (infoPtr->hwndSelf));
      Free (infoPtr);
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_KillFocus (TRACKBAR_INFO *infoPtr)
  {
      TRACE("\n");
      infoPtr->bFocussed = FALSE;
      TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  static LRESULT
  TRACKBAR_LButtonDown (TRACKBAR_INFO *infoPtr, INT x, INT y)
  {
      POINT clickPoint;
  
      clickPoint.x = x;
      clickPoint.y = y;
  
      SetFocus(infoPtr->hwndSelf);
  
      if (PtInRect(&infoPtr->rcThumb, clickPoint)) {
          infoPtr->flags |= TB_DRAG_MODE;
          SetCapture (infoPtr->hwndSelf);
  	TRACKBAR_UpdateToolTip (infoPtr);
  	TRACKBAR_ActivateToolTip (infoPtr, TRUE);
  	TRACKBAR_InvalidateThumb(infoPtr, infoPtr->lPos);
      } else {
  	LONG dir = TRACKBAR_GetAutoPageDirection(infoPtr, clickPoint);
  	if (dir == 0) return 0;
  	infoPtr->flags |= (dir < 0) ? TB_AUTO_PAGE_LEFT : TB_AUTO_PAGE_RIGHT;
  	TRACKBAR_AutoPage (infoPtr, clickPoint);
          SetCapture (infoPtr->hwndSelf);
          SetTimer(infoPtr->hwndSelf, TB_REFRESH_TIMER, TB_REFRESH_DELAY, 0);
      }
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_LButtonUp (TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->flags & TB_DRAG_MODE) {
          notify_with_scroll (infoPtr, TB_THUMBPOSITION | (infoPtr->lPos<<16));
          notify_with_scroll (infoPtr, TB_ENDTRACK);
          infoPtr->flags &= ~TB_DRAG_MODE;
          ReleaseCapture ();
  	notify(infoPtr, NM_RELEASEDCAPTURE);
          TRACKBAR_ActivateToolTip(infoPtr, FALSE);
  	TRACKBAR_InvalidateThumb(infoPtr, infoPtr->lPos);
      }
      if (infoPtr->flags & TB_AUTO_PAGE) {
  	KillTimer (infoPtr->hwndSelf, TB_REFRESH_TIMER);
          infoPtr->flags &= ~TB_AUTO_PAGE;
          notify_with_scroll (infoPtr, TB_ENDTRACK);
          ReleaseCapture ();
  	notify(infoPtr, NM_RELEASEDCAPTURE);
      }
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_CaptureChanged (const TRACKBAR_INFO *infoPtr)
  {
      notify_with_scroll (infoPtr, TB_ENDTRACK);
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_Paint (TRACKBAR_INFO *infoPtr, HDC hdc)
  {
      if (hdc) {
  	TRACKBAR_Refresh(infoPtr, hdc);
      } else {
  	PAINTSTRUCT ps;
      	hdc = BeginPaint (infoPtr->hwndSelf, &ps);
      	TRACKBAR_Refresh (infoPtr, hdc);
      	EndPaint (infoPtr->hwndSelf, &ps);
      }
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_SetFocus (TRACKBAR_INFO *infoPtr)
  {
      TRACE("\n");
      infoPtr->bFocussed = TRUE;
      TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_Size (TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->dwStyle & TBS_FIXEDLENGTH)
      {
          TRACKBAR_CalcChannel(infoPtr);
          TRACKBAR_UpdateThumb(infoPtr);
      }
      else
          TRACKBAR_InitializeThumb(infoPtr);
      TRACKBAR_AlignBuddies (infoPtr);
      TRACKBAR_InvalidateAll(infoPtr);
  
      return 0;
  }
  
  static LRESULT
  TRACKBAR_StyleChanged (TRACKBAR_INFO *infoPtr, WPARAM wStyleType,
                         const STYLESTRUCT *lpss)
  {
      if (wStyleType != GWL_STYLE) return 0;
  
      infoPtr->dwStyle = lpss->styleNew;
  
      return 0;
  }
  
  static LRESULT
  TRACKBAR_Timer (TRACKBAR_INFO *infoPtr)
  {
      if (infoPtr->flags & TB_AUTO_PAGE) {
  	POINT pt;
  	if (GetCursorPos(&pt))
  	    if (ScreenToClient(infoPtr->hwndSelf, &pt))
  		TRACKBAR_AutoPage(infoPtr, pt);
      }
      return 0;
  }
  
  
  /* update theme after a WM_THEMECHANGED message */
  static LRESULT theme_changed (const TRACKBAR_INFO* infoPtr)
  {
      HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
      CloseThemeData (theme);
      OpenThemeData (infoPtr->hwndSelf, themeClass);
      return 0;
  }
  
  
  static LRESULT
  TRACKBAR_MouseMove (TRACKBAR_INFO *infoPtr, INT x, INT y)
  {
      INT clickPlace = (infoPtr->dwStyle & TBS_VERT) ? y : x;
      LONG dragPos, oldPos = infoPtr->lPos;
  
      TRACE("(x=%d. y=%d)\n", x, y);
  
      if (infoPtr->flags & TB_AUTO_PAGE) {
  	POINT pt;
  	pt.x = x;
  	pt.y = y;
  	TRACKBAR_AutoPage (infoPtr, pt);
  	return TRUE;
      }
  
      if (!(infoPtr->flags & TB_DRAG_MODE)) 
      {
          if (GetWindowTheme (infoPtr->hwndSelf))
          {
              DWORD oldFlags = infoPtr->flags;
              POINT pt;
              pt.x = x;
              pt.y = y;
              if (PtInRect (&infoPtr->rcThumb, pt))
              {
                  TRACKMOUSEEVENT tme;
                  tme.cbSize = sizeof( tme );
                  tme.dwFlags = TME_LEAVE;
                  tme.hwndTrack = infoPtr->hwndSelf;
                  TrackMouseEvent( &tme );
                  infoPtr->flags |= TB_THUMB_HOT;
              }
              else
              {
                  TRACKMOUSEEVENT tme;
                  tme.cbSize = sizeof( tme );
                  tme.dwFlags = TME_CANCEL;
                  tme.hwndTrack = infoPtr->hwndSelf;
                  TrackMouseEvent( &tme );
                  infoPtr->flags &= ~TB_THUMB_HOT; 
              }
              if (oldFlags != infoPtr->flags) InvalidateRect (infoPtr->hwndSelf, &infoPtr->rcThumb, FALSE);
          }
          return TRUE;
      }
  
      dragPos = TRACKBAR_ConvertPlaceToPosition (infoPtr, clickPlace);
  
      if (dragPos == oldPos) return TRUE;
  
      infoPtr->lPos = dragPos;
      TRACKBAR_UpdateThumb (infoPtr);
  
      notify_with_scroll (infoPtr, TB_THUMBTRACK | (infoPtr->lPos<<16));
  
      TRACKBAR_InvalidateThumbMove(infoPtr, oldPos, dragPos);
      UpdateWindow (infoPtr->hwndSelf);
  
      return TRUE;
  }
  
  static BOOL
  TRACKBAR_KeyDown (TRACKBAR_INFO *infoPtr, INT nVirtKey)
  {
      BOOL downIsLeft = infoPtr->dwStyle & TBS_DOWNISLEFT;
      BOOL vert = infoPtr->dwStyle & TBS_VERT;
      LONG pos = infoPtr->lPos;
  
      TRACE("%x\n", nVirtKey);
  
      switch (nVirtKey) {
      case VK_UP:
  	if (!vert && downIsLeft) TRACKBAR_LineDown(infoPtr);
          else TRACKBAR_LineUp(infoPtr);
          break;
      case VK_LEFT:
          if (vert && downIsLeft) TRACKBAR_LineDown(infoPtr);
          else TRACKBAR_LineUp(infoPtr);
          break;
      case VK_DOWN:
  	if (!vert && downIsLeft) TRACKBAR_LineUp(infoPtr);
          else TRACKBAR_LineDown(infoPtr);
          break;
      case VK_RIGHT:
  	if (vert && downIsLeft) TRACKBAR_LineUp(infoPtr);
          else TRACKBAR_LineDown(infoPtr);
          break;
      case VK_NEXT:
  	if (!vert && downIsLeft) TRACKBAR_PageUp(infoPtr);
          else TRACKBAR_PageDown(infoPtr);
          break;
      case VK_PRIOR:
  	if (!vert && downIsLeft) TRACKBAR_PageDown(infoPtr);
          else TRACKBAR_PageUp(infoPtr);
          break;
      case VK_HOME:
          if (infoPtr->lPos == infoPtr->lRangeMin) return FALSE;
          infoPtr->lPos = infoPtr->lRangeMin;
          notify_with_scroll (infoPtr, TB_TOP);
          break;
      case VK_END:
          if (infoPtr->lPos == infoPtr->lRangeMax) return FALSE;
          infoPtr->lPos = infoPtr->lRangeMax;
          notify_with_scroll (infoPtr, TB_BOTTOM);
          break;
      }
  
      if (pos != infoPtr->lPos) {
  	TRACKBAR_UpdateThumb (infoPtr);
  	TRACKBAR_InvalidateThumbMove (infoPtr, pos, infoPtr->lPos);
      }
  
      return TRUE;
  }
  
  
  static inline BOOL
  TRACKBAR_KeyUp (const TRACKBAR_INFO *infoPtr, INT nVirtKey)
  {
      switch (nVirtKey) {
      case VK_LEFT:
      case VK_UP:
      case VK_RIGHT:
      case VK_DOWN:
      case VK_NEXT:
      case VK_PRIOR:
      case VK_HOME:
      case VK_END:
          notify_with_scroll (infoPtr, TB_ENDTRACK);
      }
      return TRUE;
  }
  
  
  static LRESULT
  TRACKBAR_Enable (TRACKBAR_INFO *infoPtr, BOOL enable)
  {
      if (enable)
          infoPtr->dwStyle &= ~WS_DISABLED;
      else
          infoPtr->dwStyle |= WS_DISABLED;
  
      InvalidateRect(infoPtr->hwndSelf, &infoPtr->rcThumb, TRUE);
  
      return 1;
  }
  
  static LRESULT WINAPI
  TRACKBAR_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
  {
      TRACKBAR_INFO *infoPtr = (TRACKBAR_INFO *)GetWindowLongPtrW (hwnd, 0);
  
      TRACE("hwnd=%p msg=%x wparam=%lx lparam=%lx\n", hwnd, uMsg, wParam, lParam);
  
      if (!infoPtr && (uMsg != WM_CREATE))
          return DefWindowProcW (hwnd, uMsg, wParam, lParam);
  
      switch (uMsg)
      {
      case TBM_CLEARSEL:
          return TRACKBAR_ClearSel (infoPtr, (BOOL)wParam);
  
      case TBM_CLEARTICS:
          return TRACKBAR_ClearTics (infoPtr, (BOOL)wParam);
  
      case TBM_GETBUDDY:
          return (LRESULT)(wParam ? infoPtr->hwndBuddyLA : infoPtr->hwndBuddyRB);
  
      case TBM_GETCHANNELRECT:
          return TRACKBAR_GetChannelRect (infoPtr, (LPRECT)lParam);
  
      case TBM_GETLINESIZE:
          return infoPtr->lLineSize;
  
      case TBM_GETNUMTICS:
          return TRACKBAR_GetNumTics (infoPtr);
  
      case TBM_GETPAGESIZE:
          return infoPtr->lPageSize;
  
      case TBM_GETPOS:
          return infoPtr->lPos;
  
      case TBM_GETPTICS:
          return (LRESULT)infoPtr->tics;
  
      case TBM_GETRANGEMAX:
          return infoPtr->lRangeMax;
  
      case TBM_GETRANGEMIN:
          return infoPtr->lRangeMin;
  
      case TBM_GETSELEND:
          return infoPtr->lSelMax;
  
      case TBM_GETSELSTART:
          return infoPtr->lSelMin;
  
      case TBM_GETTHUMBLENGTH:
          return infoPtr->uThumbLen;
  
      case TBM_GETTHUMBRECT:
  	return CopyRect((LPRECT)lParam, &infoPtr->rcThumb);
  
      case TBM_GETTIC:
          return TRACKBAR_GetTic (infoPtr, (INT)wParam);
  
      case TBM_GETTICPOS:
          return TRACKBAR_GetTicPos (infoPtr, (INT)wParam);
  
      case TBM_GETTOOLTIPS:
          return (LRESULT)infoPtr->hwndToolTip;
  
      case TBM_GETUNICODEFORMAT:
          return infoPtr->bUnicode;
  
      case TBM_SETBUDDY:
          return (LRESULT) TRACKBAR_SetBuddy(infoPtr, (BOOL)wParam, (HWND)lParam);
  
      case TBM_SETLINESIZE:
          return TRACKBAR_SetLineSize (infoPtr, (LONG)lParam);
  
      case TBM_SETPAGESIZE:
          return TRACKBAR_SetPageSize (infoPtr, (LONG)lParam);
  
      case TBM_SETPOS:
          return TRACKBAR_SetPos (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETRANGE:
          return TRACKBAR_SetRange (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETRANGEMAX:
          return TRACKBAR_SetRangeMax (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETRANGEMIN:
          return TRACKBAR_SetRangeMin (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETSEL:
          return TRACKBAR_SetSel (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETSELEND:
          return TRACKBAR_SetSelEnd (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETSELSTART:
          return TRACKBAR_SetSelStart (infoPtr, (BOOL)wParam, (LONG)lParam);
  
      case TBM_SETTHUMBLENGTH:
          return TRACKBAR_SetThumbLength (infoPtr, (UINT)wParam);
  
      case TBM_SETTIC:
          return TRACKBAR_SetTic (infoPtr, (LONG)lParam);
  
      case TBM_SETTICFREQ:
          return TRACKBAR_SetTicFreq (infoPtr, (WORD)wParam);
  
      case TBM_SETTIPSIDE:
          return TRACKBAR_SetTipSide (infoPtr, (INT)wParam);
  
      case TBM_SETTOOLTIPS:
          return TRACKBAR_SetToolTips (infoPtr, (HWND)wParam);
  
      case TBM_SETUNICODEFORMAT:
  	return TRACKBAR_SetUnicodeFormat (infoPtr, (BOOL)wParam);
  
  
      case WM_CAPTURECHANGED:
          if (hwnd == (HWND)lParam) return 0;
          return TRACKBAR_CaptureChanged (infoPtr);
  
      case WM_CREATE:
          return TRACKBAR_Create (hwnd, (LPCREATESTRUCTW)lParam);
  
      case WM_DESTROY:
          return TRACKBAR_Destroy (infoPtr);
  
      case WM_ENABLE:
          return TRACKBAR_Enable (infoPtr, (BOOL)wParam);
  
      case WM_ERASEBKGND:
  	return 0;
  
      case WM_GETDLGCODE:
          return DLGC_WANTARROWS;
  
      case WM_KEYDOWN:
          return TRACKBAR_KeyDown (infoPtr, (INT)wParam);
  
      case WM_KEYUP:
          return TRACKBAR_KeyUp (infoPtr, (INT)wParam);
  
      case WM_KILLFOCUS:
          return TRACKBAR_KillFocus (infoPtr);
  
      case WM_LBUTTONDOWN:
          return TRACKBAR_LButtonDown (infoPtr, (SHORT)LOWORD(lParam), (SHORT)HIWORD(lParam));
  
      case WM_LBUTTONUP:
          return TRACKBAR_LButtonUp (infoPtr);
  
      case WM_MOUSELEAVE:
          infoPtr->flags &= ~TB_THUMB_HOT; 
          InvalidateRect (infoPtr->hwndSelf, &infoPtr->rcThumb, FALSE);
          return 0;
      
      case WM_MOUSEMOVE:
          return TRACKBAR_MouseMove (infoPtr, (SHORT)LOWORD(lParam), (SHORT)HIWORD(lParam));
  
      case WM_PRINTCLIENT:
      case WM_PAINT:
          return TRACKBAR_Paint (infoPtr, (HDC)wParam);
  
      case WM_SETFOCUS:
          return TRACKBAR_SetFocus (infoPtr);
  
      case WM_SIZE:
          return TRACKBAR_Size (infoPtr);
  
      case WM_STYLECHANGED:
          return TRACKBAR_StyleChanged (infoPtr, wParam, (LPSTYLESTRUCT)lParam);
  
      case WM_THEMECHANGED:
          return theme_changed (infoPtr);
  
      case WM_TIMER:
  	return TRACKBAR_Timer (infoPtr);
  
      case WM_WININICHANGE:
          return TRACKBAR_InitializeThumb (infoPtr);
  
      default:
          if ((uMsg >= WM_USER) && (uMsg < WM_APP) && !COMCTL32_IsReflectedMessage(uMsg))
              ERR("unknown msg %04x wp=%08lx lp=%08lx\n", uMsg, wParam, lParam);
          return DefWindowProcW (hwnd, uMsg, wParam, lParam);
      }
  }
  
  
  void TRACKBAR_Register (void)
  {
      WNDCLASSW wndClass;
  
      ZeroMemory (&wndClass, sizeof(WNDCLASSW));
      wndClass.style         = CS_GLOBALCLASS;
      wndClass.lpfnWndProc   = TRACKBAR_WindowProc;
      wndClass.cbClsExtra    = 0;
      wndClass.cbWndExtra    = sizeof(TRACKBAR_INFO *);
      wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
      wndClass.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
      wndClass.lpszClassName = TRACKBAR_CLASSW;
  
      RegisterClassW (&wndClass);
  }
  
  
  void TRACKBAR_Unregister (void)
  {
      UnregisterClassW (TRACKBAR_CLASSW, NULL);
  }
  