git.oblomov.eu Git - wine/blob - controls/scroll.c

   1 /*
   2  * Scrollbar control
   3  *
   4  * Copyright 1993 Martin Ayotte
   5  * Copyright 1994, 1996 Alexandre Julliard
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "windef.h"
  23 #include "wingdi.h"
  24 #include "wine/winuser16.h"
  25 #include "controls.h"
  26 #include "win.h"
  27 #include "wine/debug.h"
  28 #include "user.h"
  29 #include "spy.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
  32
  33 typedef struct
  34 {
  35     INT   curVal;   /* Current scroll-bar value */
  36     INT   minVal;   /* Minimum scroll-bar value */
  37     INT   maxVal;   /* Maximum scroll-bar value */
  38     INT   page;     /* Page size of scroll bar (Win32) */
  39     UINT  flags;    /* EnableScrollBar flags */
  40 } SCROLLBAR_INFO;
  41
  42
  43 static HBITMAP hUpArrow;
  44 static HBITMAP hDnArrow;
  45 static HBITMAP hLfArrow;
  46 static HBITMAP hRgArrow;
  47 static HBITMAP hUpArrowD;
  48 static HBITMAP hDnArrowD;
  49 static HBITMAP hLfArrowD;
  50 static HBITMAP hRgArrowD;
  51 static HBITMAP hUpArrowI;
  52 static HBITMAP hDnArrowI;
  53 static HBITMAP hLfArrowI;
  54 static HBITMAP hRgArrowI;
  55
  56 #define TOP_ARROW(flags,pressed) \
  57    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  58 #define BOTTOM_ARROW(flags,pressed) \
  59    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  60 #define LEFT_ARROW(flags,pressed) \
  61    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  62 #define RIGHT_ARROW(flags,pressed) \
  63    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  64
  65
  66   /* Minimum size of the rectangle between the arrows */
  67 #define SCROLL_MIN_RECT  4
  68
  69   /* Minimum size of the thumb in pixels */
  70 #define SCROLL_MIN_THUMB 6
  71
  72   /* Overlap between arrows and thumb */
  73 #define SCROLL_ARROW_THUMB_OVERLAP ((TWEAK_WineLook == WIN31_LOOK) ? 1 : 0)
  74
  75   /* Delay (in ms) before first repetition when holding the button down */
  76 #define SCROLL_FIRST_DELAY   200
  77
  78   /* Delay (in ms) between scroll repetitions */
  79 #define SCROLL_REPEAT_DELAY  50
  80
  81   /* Scroll timer id */
  82 #define SCROLL_TIMER   0
  83
  84   /* Scroll-bar hit testing */
  85 enum SCROLL_HITTEST
  86 {
  87     SCROLL_NOWHERE,      /* Outside the scroll bar */
  88     SCROLL_TOP_ARROW,    /* Top or left arrow */
  89     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  90     SCROLL_THUMB,        /* Thumb rectangle */
  91     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  92     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  93 };
  94
  95  /* What to do after SCROLL_SetScrollInfo() */
  96 #define SA_SSI_HIDE             0x0001
  97 #define SA_SSI_SHOW             0x0002
  98 #define SA_SSI_REFRESH          0x0004
  99 #define SA_SSI_REPAINT_ARROWS   0x0008
 100
 101  /* Thumb-tracking info */
 102 static HWND SCROLL_TrackingWin = 0;
 103 static INT  SCROLL_TrackingBar = 0;
 104 static INT  SCROLL_TrackingPos = 0;
 105 static INT  SCROLL_TrackingVal = 0;
 106  /* Hit test code of the last button-down event */
 107 static enum SCROLL_HITTEST SCROLL_trackHitTest;
 108 static BOOL SCROLL_trackVertical;
 109
 110  /* Is the moving thumb being displayed? */
 111 static BOOL SCROLL_MovingThumb = FALSE;
 112
 113  /* Local functions */
 114 static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
 115                                     BOOL fShowH, BOOL fShowV );
 116 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
 117                                    const SCROLLINFO *info, INT *action );
 118 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 119                                     RECT *rect, INT arrowSize,
 120                                     INT thumbSize, INT thumbPos,
 121                                     UINT flags, BOOL vertical,
 122                                     BOOL top_selected, BOOL bottom_selected );
 123 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
 124
 125
 126 /*********************************************************************
 127  * scrollbar class descriptor
 128  */
 129 const struct builtin_class_descr SCROLL_builtin_class =
 130 {
 131     "ScrollBar",            /* name */
 132     CS_GLOBALCLASS | CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
 133     NULL,                   /* procA (winproc is Unicode only) */
 134     ScrollBarWndProc,       /* procW */
 135     sizeof(SCROLLBAR_INFO), /* extra */
 136     IDC_ARROWA,             /* cursor */
 137     0                       /* brush */
 138 };
 139
 140
 141 /***********************************************************************
 142  *           SCROLL_LoadBitmaps
 143  */
 144 static void SCROLL_LoadBitmaps(void)
 145 {
 146     hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
 147     hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
 148     hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
 149     hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
 150     hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
 151     hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
 152     hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
 153     hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
 154     hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
 155     hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
 156     hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
 157     hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
 158 }
 159
 160
 161 /***********************************************************************
 162  *           SCROLL_GetScrollInfo
 163  */
 164 static SCROLLBAR_INFO *SCROLL_GetScrollInfo( HWND hwnd, INT nBar )
 165 {
 166     SCROLLBAR_INFO *infoPtr;
 167     WND *wndPtr = WIN_FindWndPtr( hwnd );
 168
 169     if (!wndPtr) return NULL;
 170     switch(nBar)
 171     {
 172         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 173         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 174         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 175         default:
 176             WIN_ReleaseWndPtr( wndPtr );
 177             return NULL;
 178     }
 179
 180     if (!infoPtr)  /* Create the info structure if needed */
 181     {
 182         if ((infoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(SCROLLBAR_INFO) )))
 183         {
 184             infoPtr->minVal = infoPtr->curVal = infoPtr->page = 0;
 185             infoPtr->maxVal = 100;
 186             infoPtr->flags  = ESB_ENABLE_BOTH;
 187             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 188             else wndPtr->pVScroll = infoPtr;
 189         }
 190         if (!hUpArrow) SCROLL_LoadBitmaps();
 191     }
 192     WIN_ReleaseWndPtr( wndPtr );
 193     return infoPtr;
 194 }
 195
 196
 197 /***********************************************************************
 198  *           SCROLL_GetScrollBarRect
 199  *
 200  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 201  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 202  * 'arrowSize' returns the width or height of an arrow (depending on
 203  * the orientation of the scrollbar), 'thumbSize' returns the size of
 204  * the thumb, and 'thumbPos' returns the position of the thumb
 205  * relative to the left or to the top.
 206  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 207  */
 208 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 209                                        INT *arrowSize, INT *thumbSize,
 210                                        INT *thumbPos )
 211 {
 212     INT pixels;
 213     BOOL vertical;
 214     WND *wndPtr = WIN_FindWndPtr( hwnd );
 215
 216     switch(nBar)
 217     {
 218       case SB_HORZ:
 219         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 220         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 221         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 222         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 223         if(wndPtr->dwStyle & WS_BORDER) {
 224           lprect->left--;
 225           lprect->right++;
 226         } else if(wndPtr->dwStyle & WS_VSCROLL)
 227           lprect->right++;
 228         vertical = FALSE;
 229         break;
 230
 231       case SB_VERT:
 232         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 233         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 234         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 235         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 236         if(wndPtr->dwStyle & WS_BORDER) {
 237           lprect->top--;
 238           lprect->bottom++;
 239         } else if(wndPtr->dwStyle & WS_HSCROLL)
 240           lprect->bottom++;
 241         vertical = TRUE;
 242         break;
 243
 244       case SB_CTL:
 245         GetClientRect( hwnd, lprect );
 246         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 247         break;
 248
 249     default:
 250         WIN_ReleaseWndPtr(wndPtr);
 251         return FALSE;
 252     }
 253
 254     if (vertical) pixels = lprect->bottom - lprect->top;
 255     else pixels = lprect->right - lprect->left;
 256
 257     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 258     {
 259         if (pixels > SCROLL_MIN_RECT)
 260             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 261         else
 262             *arrowSize = 0;
 263         *thumbPos = *thumbSize = 0;
 264     }
 265     else
 266     {
 267         SCROLLBAR_INFO *info = SCROLL_GetScrollInfo( hwnd, nBar );
 268
 269         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 270         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 271
 272         if (info->page)
 273         {
 274             *thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
 275             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 276         }
 277         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 278
 279         if (((pixels -= *thumbSize ) < 0) ||
 280             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 281         {
 282             /* Rectangle too small or scrollbar disabled -> no thumb */
 283             *thumbPos = *thumbSize = 0;
 284         }
 285         else
 286         {
 287             INT max = info->maxVal - max( info->page-1, 0 );
 288             if (info->minVal >= max)
 289                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 290             else
 291                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 292                   + MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
 293         }
 294     }
 295     WIN_ReleaseWndPtr(wndPtr);
 296     return vertical;
 297 }
 298
 299
 300 /***********************************************************************
 301  *           SCROLL_GetThumbVal
 302  *
 303  * Compute the current scroll position based on the thumb position in pixels
 304  * from the top of the scroll-bar.
 305  */
 306 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 307                                   BOOL vertical, INT pos )
 308 {
 309     INT thumbSize;
 310     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 311
 312     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 313         return infoPtr->minVal;
 314
 315     if (infoPtr->page)
 316     {
 317         thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
 318         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 319     }
 320     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 321
 322     if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
 323
 324     pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 325     if (pos > pixels) pos = pixels;
 326
 327     if (!infoPtr->page) pos *= infoPtr->maxVal - infoPtr->minVal;
 328     else pos *= infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
 329     return infoPtr->minVal + ((pos + pixels / 2) / pixels);
 330 }
 331
 332 /***********************************************************************
 333  *           SCROLL_PtInRectEx
 334  */
 335 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 336 {
 337     RECT rect = *lpRect;
 338
 339     if (vertical)
 340     {
 341         rect.left -= lpRect->right - lpRect->left;
 342         rect.right += lpRect->right - lpRect->left;
 343     }
 344     else
 345     {
 346         rect.top -= lpRect->bottom - lpRect->top;
 347         rect.bottom += lpRect->bottom - lpRect->top;
 348     }
 349     return PtInRect( &rect, pt );
 350 }
 351
 352 /***********************************************************************
 353  *           SCROLL_ClipPos
 354  */
 355 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 356 {
 357     if( pt.x < lpRect->left )
 358         pt.x = lpRect->left;
 359     else
 360     if( pt.x > lpRect->right )
 361         pt.x = lpRect->right;
 362
 363     if( pt.y < lpRect->top )
 364         pt.y = lpRect->top;
 365     else
 366     if( pt.y > lpRect->bottom )
 367         pt.y = lpRect->bottom;
 368
 369     return pt;
 370 }
 371
 372
 373 /***********************************************************************
 374  *           SCROLL_HitTest
 375  *
 376  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 377  */
 378 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 379                                            POINT pt, BOOL bDragging )
 380 {
 381     INT arrowSize, thumbSize, thumbPos;
 382     RECT rect;
 383
 384     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 385                                            &arrowSize, &thumbSize, &thumbPos );
 386
 387     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 388          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 389
 390     if (vertical)
 391     {
 392         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 393         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 394         if (!thumbPos) return SCROLL_TOP_RECT;
 395         pt.y -= rect.top;
 396         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 397         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 398     }
 399     else  /* horizontal */
 400     {
 401         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 402         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 403         if (!thumbPos) return SCROLL_TOP_RECT;
 404         pt.x -= rect.left;
 405         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 406         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 407     }
 408     return SCROLL_THUMB;
 409 }
 410
 411
 412 /***********************************************************************
 413  *           SCROLL_DrawArrows
 414  *
 415  * Draw the scroll bar arrows.
 416  */
 417 static void SCROLL_DrawArrows_9x( HDC hdc, SCROLLBAR_INFO *infoPtr,
 418                                   RECT *rect, INT arrowSize, BOOL vertical,
 419                                   BOOL top_pressed, BOOL bottom_pressed )
 420 {
 421   RECT r;
 422
 423   r = *rect;
 424   if( vertical )
 425     r.bottom = r.top + arrowSize;
 426   else
 427     r.right = r.left + arrowSize;
 428
 429   DrawFrameControl( hdc, &r, DFC_SCROLL,
 430                     (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
 431                     | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 432                     | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );
 433
 434   r = *rect;
 435   if( vertical )
 436     r.top = r.bottom-arrowSize;
 437   else
 438     r.left = r.right-arrowSize;
 439
 440   DrawFrameControl( hdc, &r, DFC_SCROLL,
 441                     (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
 442                     | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 443                     | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
 444 }
 445
 446 static void SCROLL_DrawArrows_31( HDC hdc, SCROLLBAR_INFO *infoPtr,
 447                                   RECT *rect, INT arrowSize, BOOL vertical,
 448                                   BOOL top_pressed, BOOL bottom_pressed )
 449 {
 450     HDC hdcMem = CreateCompatibleDC( hdc );
 451     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 452                                     TOP_ARROW(infoPtr->flags, top_pressed)
 453                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 454
 455     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 456     StretchBlt( hdc, rect->left, rect->top,
 457                   vertical ? rect->right-rect->left : arrowSize,
 458                   vertical ? arrowSize : rect->bottom-rect->top,
 459                   hdcMem, 0, 0,
 460                   GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 461                   SRCCOPY );
 462
 463     SelectObject( hdcMem, vertical ?
 464                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 465                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 466     if (vertical)
 467         StretchBlt( hdc, rect->left, rect->bottom - arrowSize,
 468                       rect->right - rect->left, arrowSize,
 469                       hdcMem, 0, 0,
 470                       GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 471                       SRCCOPY );
 472     else
 473         StretchBlt( hdc, rect->right - arrowSize, rect->top,
 474                       arrowSize, rect->bottom - rect->top,
 475                       hdcMem, 0, 0,
 476                       GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
 477                       SRCCOPY );
 478     SelectObject( hdcMem, hbmpPrev );
 479     DeleteDC( hdcMem );
 480 }
 481
 482 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 483                                RECT *rect, INT arrowSize, BOOL vertical,
 484                                BOOL top_pressed, BOOL bottom_pressed )
 485 {
 486   if( TWEAK_WineLook == WIN31_LOOK )
 487     SCROLL_DrawArrows_31( hdc, infoPtr, rect, arrowSize,
 488                           vertical, top_pressed,bottom_pressed );
 489   else
 490     SCROLL_DrawArrows_9x( hdc, infoPtr, rect, arrowSize,
 491                           vertical, top_pressed,bottom_pressed );
 492 }
 493
 494
 495 /***********************************************************************
 496  *           SCROLL_DrawMovingThumb
 497  *
 498  * Draw the moving thumb rectangle.
 499  */
 500 static void SCROLL_DrawMovingThumb_31( HDC hdc, RECT *rect, BOOL vertical,
 501                                        INT arrowSize, INT thumbSize )
 502 {
 503     RECT r = *rect;
 504     if (vertical)
 505     {
 506         r.top += SCROLL_TrackingPos;
 507         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 508             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 509         if (r.top + thumbSize >
 510                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 511             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 512                                                                   - thumbSize;
 513         r.bottom = r.top + thumbSize;
 514     }
 515     else
 516     {
 517         r.left += SCROLL_TrackingPos;
 518         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 519             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 520         if (r.left + thumbSize >
 521                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 522             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 523                                                                   - thumbSize;
 524         r.right = r.left + thumbSize;
 525     }
 526
 527     DrawFocusRect( hdc, &r );
 528     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 529 }
 530
 531 static void SCROLL_DrawMovingThumb_9x( HDC hdc, RECT *rect, BOOL vertical,
 532                                        INT arrowSize, INT thumbSize )
 533 {
 534   INT pos = SCROLL_TrackingPos;
 535   INT max_size;
 536
 537   if( vertical )
 538     max_size = rect->bottom - rect->top;
 539   else
 540     max_size = rect->right - rect->left;
 541
 542   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 543
 544   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 545     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 546   else if( pos > max_size )
 547     pos = max_size;
 548
 549   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 550                           rect, arrowSize, thumbSize, pos,
 551                           0, vertical, FALSE, FALSE );
 552
 553   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 554 }
 555
 556 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 557                                     INT arrowSize, INT thumbSize )
 558 {
 559   if( TWEAK_WineLook == WIN31_LOOK )
 560     SCROLL_DrawMovingThumb_31( hdc, rect, vertical, arrowSize, thumbSize );
 561   else
 562     SCROLL_DrawMovingThumb_9x( hdc, rect, vertical, arrowSize, thumbSize );
 563 }
 564
 565 /***********************************************************************
 566  *           SCROLL_DrawInterior
 567  *
 568  * Draw the scroll bar interior (everything except the arrows).
 569  */
 570 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 571                                     RECT *rect, INT arrowSize,
 572                                     INT thumbSize, INT thumbPos,
 573                                     UINT flags, BOOL vertical,
 574                                     BOOL top_selected, BOOL bottom_selected )
 575 {
 576     RECT r;
 577     HPEN hSavePen;
 578     HBRUSH hSaveBrush,hBrush;
 579
 580     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 581      * The window-owned scrollbars need to call DEFWND_ControlColor
 582      * to correctly setup default scrollbar colors
 583      */
 584     if (nBar == SB_CTL)
 585     {
 586       hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 587                                      (WPARAM)hdc,(LPARAM)hwnd);
 588     }
 589     else
 590     {
 591       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 592     }
 593
 594     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 595     hSaveBrush = SelectObject( hdc, hBrush );
 596
 597     /* Calculate the scroll rectangle */
 598     r = *rect;
 599     if (vertical)
 600     {
 601         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 602         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 603     }
 604     else
 605     {
 606         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 607         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 608     }
 609
 610     /* Draw the scroll rectangles and thumb */
 611     if (!thumbPos)  /* No thumb to draw */
 612     {
 613         PatBlt( hdc, r.left, r.top,
 614                      r.right - r.left, r.bottom - r.top,
 615                      PATCOPY );
 616
 617         /* cleanup and return */
 618         SelectObject( hdc, hSavePen );
 619         SelectObject( hdc, hSaveBrush );
 620         return;
 621     }
 622
 623     if (vertical)
 624     {
 625         PatBlt( hdc, r.left, r.top,
 626                   r.right - r.left,
 627                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 628                   top_selected ? 0x0f0000 : PATCOPY );
 629         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 630         PatBlt( hdc, r.left, r.top + thumbSize,
 631                   r.right - r.left,
 632                   r.bottom - r.top - thumbSize,
 633                   bottom_selected ? 0x0f0000 : PATCOPY );
 634         r.bottom = r.top + thumbSize;
 635     }
 636     else  /* horizontal */
 637     {
 638         PatBlt( hdc, r.left, r.top,
 639                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 640                   r.bottom - r.top,
 641                   top_selected ? 0x0f0000 : PATCOPY );
 642         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 643         PatBlt( hdc, r.left + thumbSize, r.top,
 644                   r.right - r.left - thumbSize,
 645                   r.bottom - r.top,
 646                   bottom_selected ? 0x0f0000 : PATCOPY );
 647         r.right = r.left + thumbSize;
 648     }
 649
 650     /* Draw the thumb */
 651     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 652
 653     /* cleanup */
 654     SelectObject( hdc, hSavePen );
 655     SelectObject( hdc, hSaveBrush );
 656 }
 657
 658
 659 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 660                                  RECT *rect, INT arrowSize,
 661                                  INT thumbSize, INT thumbPos,
 662                                  UINT flags, BOOL vertical,
 663                                  BOOL top_selected, BOOL bottom_selected )
 664 {
 665     RECT r;
 666     HPEN hSavePen;
 667     HBRUSH hSaveBrush,hBrush;
 668     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 669
 670     if (Save_SCROLL_MovingThumb &&
 671         (SCROLL_TrackingWin == hwnd) &&
 672         (SCROLL_TrackingBar == nBar))
 673         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 674
 675       /* Select the correct brush and pen */
 676
 677     if (TWEAK_WineLook == WIN31_LOOK && (flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 678     {
 679         /* This ought to be the color of the parent window */
 680         hBrush = GetSysColorBrush(COLOR_WINDOW);
 681     }
 682     else
 683     {
 684         /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 685          * The window-owned scrollbars need to call DEFWND_ControlColor
 686          * to correctly setup default scrollbar colors
 687          */
 688         if (nBar == SB_CTL) {
 689             hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 690                                            (WPARAM)hdc,(LPARAM)hwnd);
 691         } else {
 692             hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 693         }
 694     }
 695     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 696     hSaveBrush = SelectObject( hdc, hBrush );
 697
 698       /* Calculate the scroll rectangle */
 699
 700     r = *rect;
 701     if (vertical)
 702     {
 703         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 704         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 705     }
 706     else
 707     {
 708         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 709         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 710     }
 711
 712       /* Draw the scroll bar frame */
 713
 714         /* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
 715     if (TWEAK_WineLook == WIN31_LOOK)
 716         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 717
 718       /* Draw the scroll rectangles and thumb */
 719
 720     if (!thumbPos)  /* No thumb to draw */
 721     {
 722         INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 0 : 1;
 723
 724         PatBlt( hdc, r.left+offset, r.top+offset,
 725                      r.right - r.left - 2*offset, r.bottom - r.top - 2*offset,
 726                      PATCOPY );
 727
 728         /* cleanup and return */
 729         SelectObject( hdc, hSavePen );
 730         SelectObject( hdc, hSaveBrush );
 731         return;
 732     }
 733
 734     if (vertical)
 735     {
 736         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 737
 738         PatBlt( hdc, r.left + offset, r.top + offset,
 739                   r.right - r.left - offset*2,
 740                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - offset,
 741                   top_selected ? 0x0f0000 : PATCOPY );
 742         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 743         PatBlt( hdc, r.left + offset, r.top + thumbSize,
 744                   r.right - r.left - offset*2,
 745                   r.bottom - r.top - thumbSize - offset,
 746                   bottom_selected ? 0x0f0000 : PATCOPY );
 747         r.bottom = r.top + thumbSize;
 748     }
 749     else  /* horizontal */
 750     {
 751         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 752
 753         PatBlt( hdc, r.left + offset, r.top + offset,
 754                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 755                   r.bottom - r.top - offset*2,
 756                   top_selected ? 0x0f0000 : PATCOPY );
 757         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 758         PatBlt( hdc, r.left + thumbSize, r.top + offset,
 759                   r.right - r.left - thumbSize - offset,
 760                   r.bottom - r.top - offset*2,
 761                   bottom_selected ? 0x0f0000 : PATCOPY );
 762         r.right = r.left + thumbSize;
 763     }
 764
 765       /* Draw the thumb */
 766
 767     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 768     if (TWEAK_WineLook == WIN31_LOOK)
 769     {
 770         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 771         r.top++, r.left++;
 772     }
 773     else
 774     {
 775         Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 776     }
 777     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 778
 779     if (Save_SCROLL_MovingThumb &&
 780         (SCROLL_TrackingWin == hwnd) &&
 781         (SCROLL_TrackingBar == nBar))
 782         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 783
 784     /* cleanup */
 785     SelectObject( hdc, hSavePen );
 786     SelectObject( hdc, hSaveBrush );
 787 }
 788
 789
 790 /***********************************************************************
 791  *           SCROLL_DrawScrollBar
 792  *
 793  * Redraw the whole scrollbar.
 794  */
 795 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 796                            BOOL arrows, BOOL interior )
 797 {
 798     INT arrowSize, thumbSize, thumbPos;
 799     RECT rect;
 800     BOOL vertical;
 801     WND *wndPtr = WIN_FindWndPtr( hwnd );
 802     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 803     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 804
 805     if (!wndPtr || !infoPtr ||
 806         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 807         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 808     if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
 809     hwnd = wndPtr->hwndSelf;  /* make it a full handle */
 810
 811     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 812                                         &arrowSize, &thumbSize, &thumbPos );
 813
 814     /* do not draw if the scrollbar rectangle is empty */
 815     if(IsRectEmpty(&rect))
 816       goto END;
 817
 818     if (Save_SCROLL_MovingThumb &&
 819         (SCROLL_TrackingWin == hwnd) &&
 820         (SCROLL_TrackingBar == nBar))
 821         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 822
 823       /* Draw the arrows */
 824
 825     if (arrows && arrowSize)
 826     {
 827         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 828             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 829                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 830                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 831         else
 832             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 833                                                                FALSE, FALSE );
 834     }
 835     if( interior )
 836         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 837                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 838
 839     if (Save_SCROLL_MovingThumb &&
 840         (SCROLL_TrackingWin == hwnd) &&
 841         (SCROLL_TrackingBar == nBar))
 842         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 843
 844     /* if scroll bar has focus, reposition the caret */
 845     if(hwnd==GetFocus() && (nBar==SB_CTL))
 846     {
 847         if (!vertical)
 848         {
 849             SetCaretPos(thumbPos+1, rect.top+1);
 850         }
 851         else
 852         {
 853             SetCaretPos(rect.top+1, thumbPos+1);
 854         }
 855     }
 856
 857 END:
 858     WIN_ReleaseWndPtr(wndPtr);
 859 }
 860
 861
 862 /***********************************************************************
 863  *           SCROLL_RefreshScrollBar
 864  *
 865  * Repaint the scroll bar interior after a SetScrollRange() or
 866  * SetScrollPos() call.
 867  */
 868 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 869                                      BOOL arrows, BOOL interior )
 870 {
 871     HDC hdc = GetDCEx( hwnd, 0,
 872                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 873     if (!hdc) return;
 874
 875     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 876     ReleaseDC( hwnd, hdc );
 877 }
 878
 879
 880 /***********************************************************************
 881  *           SCROLL_HandleKbdEvent
 882  *
 883  * Handle a keyboard event (only for SB_CTL scrollbars).
 884  */
 885 static void SCROLL_HandleKbdEvent( HWND hwnd, WPARAM wParam )
 886 {
 887     WPARAM msg;
 888
 889     switch(wParam)
 890     {
 891     case VK_PRIOR: msg = SB_PAGEUP; break;
 892     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 893     case VK_HOME:  msg = SB_TOP; break;
 894     case VK_END:   msg = SB_BOTTOM; break;
 895     case VK_UP:    msg = SB_LINEUP; break;
 896     case VK_DOWN:  msg = SB_LINEDOWN; break;
 897     default: return;
 898     }
 899     SendMessageW( GetParent(hwnd),
 900                   (GetWindowLongA( hwnd, GWL_STYLE ) & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 901                   msg, (LPARAM)hwnd );
 902 }
 903
 904
 905 /***********************************************************************
 906  *           SCROLL_HandleScrollEvent
 907  *
 908  * Handle a mouse or timer event for the scrollbar.
 909  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 910  * windows coordinates.
 911  */
 912 static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 913 {
 914       /* Previous mouse position for timer events */
 915     static POINT prevPt;
 916       /* Thumb position when tracking started. */
 917     static UINT trackThumbPos;
 918       /* Position in the scroll-bar of the last button-down event. */
 919     static INT lastClickPos;
 920       /* Position in the scroll-bar of the last mouse event. */
 921     static INT lastMousePos;
 922
 923     enum SCROLL_HITTEST hittest;
 924     HWND hwndOwner, hwndCtl;
 925     BOOL vertical;
 926     INT arrowSize, thumbSize, thumbPos;
 927     RECT rect;
 928     HDC hdc;
 929
 930     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 931     if (!infoPtr) return;
 932     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 933                   return;
 934
 935     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 936     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 937                                         &arrowSize, &thumbSize, &thumbPos );
 938     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 939     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 940
 941     switch(msg)
 942     {
 943       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 944           HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 945           SCROLL_trackVertical = vertical;
 946           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 947           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 948           lastMousePos  = lastClickPos;
 949           trackThumbPos = thumbPos;
 950           prevPt = pt;
 951           if (nBar == SB_CTL && (GetWindowLongA(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
 952           SetCapture( hwnd );
 953           break;
 954
 955       case WM_MOUSEMOVE:
 956           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 957           prevPt = pt;
 958           break;
 959
 960       case WM_LBUTTONUP:
 961           hittest = SCROLL_NOWHERE;
 962           ReleaseCapture();
 963           /* if scrollbar has focus, show back caret */
 964           if (hwnd==GetFocus()) ShowCaret(hwnd);
 965           break;
 966
 967       case WM_SYSTIMER:
 968           pt = prevPt;
 969           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 970           break;
 971
 972       default:
 973           return;  /* Should never happen */
 974     }
 975
 976     TRACE("Event: hwnd=%04x bar=%d msg=%s pt=%ld,%ld hit=%d\n",
 977           hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
 978
 979     switch(SCROLL_trackHitTest)
 980     {
 981     case SCROLL_NOWHERE:  /* No tracking in progress */
 982         break;
 983
 984     case SCROLL_TOP_ARROW:
 985         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 986                            (hittest == SCROLL_trackHitTest), FALSE );
 987         if (hittest == SCROLL_trackHitTest)
 988         {
 989             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 990             {
 991                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 992                                 SB_LINEUP, (LPARAM)hwndCtl );
 993             }
 994
 995             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 996                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 997                             (TIMERPROC)0 );
 998         }
 999         else KillSystemTimer( hwnd, SCROLL_TIMER );
1000         break;
1001
1002     case SCROLL_TOP_RECT:
1003         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1004                              thumbPos, infoPtr->flags, vertical,
1005                              (hittest == SCROLL_trackHitTest), FALSE );
1006         if (hittest == SCROLL_trackHitTest)
1007         {
1008             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1009             {
1010                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1011                                 SB_PAGEUP, (LPARAM)hwndCtl );
1012             }
1013             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1014                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1015                               (TIMERPROC)0 );
1016         }
1017         else KillSystemTimer( hwnd, SCROLL_TIMER );
1018         break;
1019
1020     case SCROLL_THUMB:
1021         if (msg == WM_LBUTTONDOWN)
1022         {
1023             SCROLL_TrackingWin = hwnd;
1024             SCROLL_TrackingBar = nBar;
1025             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
1026             if (!SCROLL_MovingThumb)
1027                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1028         }
1029         else if (msg == WM_LBUTTONUP)
1030         {
1031             if (SCROLL_MovingThumb)
1032                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1033             SCROLL_TrackingWin = 0;
1034             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1035                                  thumbPos, infoPtr->flags, vertical,
1036                                  FALSE, FALSE );
1037         }
1038         else  /* WM_MOUSEMOVE */
1039         {
1040             UINT pos;
1041
1042             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
1043             else
1044             {
1045                 pt = SCROLL_ClipPos( &rect, pt );
1046                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
1047             }
1048             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
1049             {
1050                 if (SCROLL_MovingThumb)
1051                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1052                                         arrowSize, thumbSize );
1053                 lastMousePos = pos;
1054                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
1055                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1056                                                          vertical,
1057                                                          SCROLL_TrackingPos );
1058                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1059                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
1060                                 (LPARAM)hwndCtl );
1061                 if (!SCROLL_MovingThumb)
1062                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1063                                         arrowSize, thumbSize );
1064             }
1065         }
1066         break;
1067
1068     case SCROLL_BOTTOM_RECT:
1069         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1070                              thumbPos, infoPtr->flags, vertical,
1071                              FALSE, (hittest == SCROLL_trackHitTest) );
1072         if (hittest == SCROLL_trackHitTest)
1073         {
1074             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1075             {
1076                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1077                                 SB_PAGEDOWN, (LPARAM)hwndCtl );
1078             }
1079             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1080                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1081                               (TIMERPROC)0 );
1082         }
1083         else KillSystemTimer( hwnd, SCROLL_TIMER );
1084         break;
1085
1086     case SCROLL_BOTTOM_ARROW:
1087         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1088                            FALSE, (hittest == SCROLL_trackHitTest) );
1089         if (hittest == SCROLL_trackHitTest)
1090         {
1091             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1092             {
1093                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1094                                 SB_LINEDOWN, (LPARAM)hwndCtl );
1095             }
1096
1097             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1098                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1099                             (TIMERPROC)0 );
1100         }
1101         else KillSystemTimer( hwnd, SCROLL_TIMER );
1102         break;
1103     }
1104
1105     if (msg == WM_LBUTTONDOWN)
1106     {
1107
1108         if (hittest == SCROLL_THUMB)
1109         {
1110             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1111                                  trackThumbPos + lastMousePos - lastClickPos );
1112             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1113                             MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
1114         }
1115     }
1116
1117     if (msg == WM_LBUTTONUP)
1118     {
1119         hittest = SCROLL_trackHitTest;
1120         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1121
1122         if (hittest == SCROLL_THUMB)
1123         {
1124             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1125                                  trackThumbPos + lastMousePos - lastClickPos );
1126             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1127                             MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
1128         }
1129         SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1130                           SB_ENDSCROLL, (LPARAM)hwndCtl );
1131     }
1132
1133     ReleaseDC( hwnd, hdc );
1134 }
1135
1136
1137 /***********************************************************************
1138  *           SCROLL_TrackScrollBar
1139  *
1140  * Track a mouse button press on a scroll-bar.
1141  * pt is in screen-coordinates for non-client scroll bars.
1142  */
1143 void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
1144 {
1145     MSG msg;
1146     INT xoffset = 0, yoffset = 0;
1147
1148     if (scrollbar != SB_CTL)
1149     {
1150         WND *wndPtr = WIN_GetPtr( hwnd );
1151         if (!wndPtr || wndPtr == WND_OTHER_PROCESS) return;
1152         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
1153         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
1154         WIN_ReleasePtr( wndPtr );
1155         ScreenToClient( hwnd, &pt );
1156         pt.x += xoffset;
1157         pt.y += yoffset;
1158     }
1159
1160     SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
1161
1162     do
1163     {
1164         if (!GetMessageW( &msg, 0, 0, 0 )) break;
1165         if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
1166         switch(msg.message)
1167         {
1168         case WM_LBUTTONUP:
1169         case WM_MOUSEMOVE:
1170         case WM_SYSTIMER:
1171             pt.x = LOWORD(msg.lParam) + xoffset;
1172             pt.y = HIWORD(msg.lParam) + yoffset;
1173             SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
1174             break;
1175         default:
1176             TranslateMessage( &msg );
1177             DispatchMessageW( &msg );
1178             break;
1179         }
1180         if (!IsWindow( hwnd ))
1181         {
1182             ReleaseCapture();
1183             break;
1184         }
1185     } while (msg.message != WM_LBUTTONUP);
1186 }
1187
1188
1189 /***********************************************************************
1190  *           ScrollBarWndProc
1191  */
1192 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
1193 {
1194     if (!IsWindow( hwnd )) return 0;
1195
1196     switch(message)
1197     {
1198     case WM_CREATE:
1199         {
1200             SCROLLBAR_INFO *infoPtr;
1201             CREATESTRUCTW *lpCreat = (CREATESTRUCTW *)lParam;
1202
1203             if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, SB_CTL ))) return -1;
1204             if (lpCreat->style & WS_DISABLED)
1205             {
1206                 TRACE("Created WS_DISABLED scrollbar\n");
1207                 infoPtr->flags = ESB_DISABLE_BOTH;
1208             }
1209
1210             if (lpCreat->style & SBS_SIZEBOX)
1211             {
1212                 FIXME("Unimplemented style SBS_SIZEBOX.\n" );
1213                 return 0;
1214             }
1215             if (lpCreat->style & SBS_VERT)
1216             {
1217                 if (lpCreat->style & SBS_LEFTALIGN)
1218                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
1219                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
1220                 else if (lpCreat->style & SBS_RIGHTALIGN)
1221                     MoveWindow( hwnd,
1222                                   lpCreat->x+lpCreat->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1223                                   lpCreat->y,
1224                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
1225             }
1226             else  /* SBS_HORZ */
1227             {
1228                 if (lpCreat->style & SBS_TOPALIGN)
1229                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
1230                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1231                 else if (lpCreat->style & SBS_BOTTOMALIGN)
1232                     MoveWindow( hwnd,
1233                                   lpCreat->x,
1234                                   lpCreat->y+lpCreat->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1235                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1236             }
1237         }
1238         if (!hUpArrow) SCROLL_LoadBitmaps();
1239         TRACE("ScrollBar creation, hwnd=%04x\n", hwnd );
1240         return 0;
1241
1242     case WM_ENABLE:
1243         {
1244             SCROLLBAR_INFO *infoPtr;
1245             if ((infoPtr = SCROLL_GetScrollInfo( hwnd, SB_CTL )))
1246             {
1247                 infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
1248                 SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
1249             }
1250         }
1251         return 0;
1252
1253     case WM_LBUTTONDOWN:
1254         {
1255             POINT pt;
1256             pt.x = SLOWORD(lParam);
1257             pt.y = SHIWORD(lParam);
1258             SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
1259         }
1260         break;
1261     case WM_LBUTTONUP:
1262     case WM_MOUSEMOVE:
1263     case WM_SYSTIMER:
1264         {
1265             POINT pt;
1266             pt.x = SLOWORD(lParam);
1267             pt.y = SHIWORD(lParam);
1268             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1269         }
1270         break;
1271
1272     /* if key event is received, the scrollbar has the focus */
1273     case WM_KEYDOWN:
1274         /* hide caret on first KEYDOWN to prevent flicker */
1275         if ((lParam & 0x40000000)==0)
1276             HideCaret(hwnd);
1277         SCROLL_HandleKbdEvent( hwnd, wParam );
1278         break;
1279
1280     case WM_KEYUP:
1281         ShowCaret(hwnd);
1282         break;
1283
1284     case WM_SETFOCUS:
1285         {
1286             /* Create a caret when a ScrollBar get focus */
1287             RECT rect;
1288             int arrowSize, thumbSize, thumbPos, vertical;
1289             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
1290                                                 &arrowSize, &thumbSize, &thumbPos );
1291             if (!vertical)
1292             {
1293                 CreateCaret(hwnd,1, thumbSize-2, rect.bottom-rect.top-2);
1294                 SetCaretPos(thumbPos+1, rect.top+1);
1295             }
1296             else
1297             {
1298                 CreateCaret(hwnd,1, rect.right-rect.left-2,thumbSize-2);
1299                 SetCaretPos(rect.top+1, thumbPos+1);
1300             }
1301             ShowCaret(hwnd);
1302         }
1303         break;
1304
1305     case WM_KILLFOCUS:
1306         {
1307             RECT rect;
1308             int arrowSize, thumbSize, thumbPos, vertical;
1309             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
1310             if (!vertical){
1311                 rect.left=thumbPos+1;
1312                 rect.right=rect.left+thumbSize;
1313             }
1314             else
1315             {
1316                 rect.top=thumbPos+1;
1317                 rect.bottom=rect.top+thumbSize;
1318             }
1319             HideCaret(hwnd);
1320             InvalidateRect(hwnd,&rect,0);
1321             DestroyCaret();
1322         }
1323         break;
1324
1325     case WM_ERASEBKGND:
1326          return 1;
1327
1328     case WM_GETDLGCODE:
1329          return DLGC_WANTARROWS; /* Windows returns this value */
1330
1331     case WM_PAINT:
1332         {
1333             PAINTSTRUCT ps;
1334             HDC hdc = BeginPaint( hwnd, &ps );
1335             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1336             EndPaint( hwnd, &ps );
1337         }
1338         break;
1339
1340     case SBM_SETPOS16:
1341     case SBM_SETPOS:
1342         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1343
1344     case SBM_GETPOS16:
1345     case SBM_GETPOS:
1346         return GetScrollPos( hwnd, SB_CTL );
1347
1348     case SBM_SETRANGE16:
1349         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
1350                           wParam  /* FIXME: Is this correct? */ );
1351         return 0;
1352
1353     case SBM_SETRANGE:
1354         {
1355             INT oldPos = GetScrollPos( hwnd, SB_CTL );
1356             SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
1357             if (oldPos != GetScrollPos( hwnd, SB_CTL )) return oldPos;
1358         }
1359         return 0;
1360
1361     case SBM_GETRANGE16:
1362         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
1363         return 0;
1364
1365     case SBM_GETRANGE:
1366         GetScrollRange( hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam );
1367         return 0;
1368
1369     case SBM_ENABLE_ARROWS16:
1370     case SBM_ENABLE_ARROWS:
1371         return EnableScrollBar( hwnd, SB_CTL, wParam );
1372
1373     case SBM_SETRANGEREDRAW:
1374         {
1375             INT oldPos = GetScrollPos( hwnd, SB_CTL );
1376             SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
1377             if (oldPos != GetScrollPos( hwnd, SB_CTL )) return oldPos;
1378         }
1379         return 0;
1380
1381     case SBM_SETSCROLLINFO:
1382         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1383
1384     case SBM_GETSCROLLINFO:
1385         return GetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam );
1386
1387     case 0x00e5:
1388     case 0x00e7:
1389     case 0x00e8:
1390     case 0x00eb:
1391     case 0x00ec:
1392     case 0x00ed:
1393     case 0x00ee:
1394     case 0x00ef:
1395         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1396                     message, wParam, lParam );
1397         break;
1398
1399     default:
1400         if (message >= WM_USER)
1401             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1402                          message, wParam, lParam );
1403         return DefWindowProcW( hwnd, message, wParam, lParam );
1404     }
1405     return 0;
1406 }
1407
1408
1409 /*************************************************************************
1410  *           SetScrollInfo   (USER32.@)
1411  * SetScrollInfo can be used to set the position, upper bound,
1412  * lower bound, and page size of a scrollbar control.
1413  *
1414  * RETURNS
1415  *    Scrollbar position
1416  *
1417  * NOTE
1418  *    For 100 lines of text to be displayed in a window of 25 lines,
1419  *  one would for instance use info->nMin=0, info->nMax=75
1420  *  (corresponding to the 76 different positions of the window on
1421  *  the text), and info->nPage=25.
1422  */
1423 INT WINAPI SetScrollInfo(
1424 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1425 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1426 const SCROLLINFO *info /* [in] Specifies what to change and new values */,
1427 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1428 {
1429     INT action;
1430     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1431
1432     if( action & SA_SSI_HIDE )
1433         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1434     else
1435     {
1436         if( action & SA_SSI_SHOW )
1437             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1438                 return retVal; /* SetWindowPos() already did the painting */
1439
1440         if( bRedraw && (action & SA_SSI_REFRESH))
1441             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1442         else if( action & SA_SSI_REPAINT_ARROWS )
1443             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1444     }
1445     return retVal;
1446 }
1447
1448 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1449                             const SCROLLINFO *info, INT *action  )
1450 {
1451     /* Update the scrollbar state and set action flags according to
1452      * what has to be done graphics wise. */
1453
1454     SCROLLBAR_INFO *infoPtr;
1455     UINT new_flags;
1456     BOOL bChangeParams = FALSE; /* don't show/hide scrollbar if params don't change */
1457
1458    *action = 0;
1459
1460     if (!(infoPtr = SCROLL_GetScrollInfo(hwnd, nBar))) return 0;
1461     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1462     if ((info->cbSize != sizeof(*info)) &&
1463         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1464
1465     if (TRACE_ON(scroll))
1466     {
1467         TRACE("hwnd=%04x bar=%d", hwnd, nBar);
1468         if (info->fMask & SIF_PAGE) DPRINTF( " page=%d", info->nPage );
1469         if (info->fMask & SIF_POS) DPRINTF( " pos=%d", info->nPos );
1470         if (info->fMask & SIF_RANGE) DPRINTF( " min=%d max=%d", info->nMin, info->nMax );
1471         DPRINTF("\n");
1472     }
1473
1474     /* Set the page size */
1475
1476     if (info->fMask & SIF_PAGE)
1477     {
1478         if( infoPtr->page != info->nPage )
1479         {
1480             infoPtr->page = info->nPage;
1481            *action |= SA_SSI_REFRESH;
1482            bChangeParams = TRUE;
1483         }
1484     }
1485
1486     /* Set the scroll pos */
1487
1488     if (info->fMask & SIF_POS)
1489     {
1490         if( infoPtr->curVal != info->nPos )
1491         {
1492             infoPtr->curVal = info->nPos;
1493            *action |= SA_SSI_REFRESH;
1494         }
1495     }
1496
1497     /* Set the scroll range */
1498
1499     if (info->fMask & SIF_RANGE)
1500     {
1501         /* Invalid range -> range is set to (0,0) */
1502         if ((info->nMin > info->nMax) ||
1503             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1504         {
1505             infoPtr->minVal = 0;
1506             infoPtr->maxVal = 0;
1507             bChangeParams = TRUE;
1508         }
1509         else
1510         {
1511             if( infoPtr->minVal != info->nMin ||
1512                 infoPtr->maxVal != info->nMax )
1513             {
1514                 *action |= SA_SSI_REFRESH;
1515                 infoPtr->minVal = info->nMin;
1516                 infoPtr->maxVal = info->nMax;
1517                 bChangeParams = TRUE;
1518             }
1519         }
1520     }
1521
1522     /* Make sure the page size is valid */
1523
1524     if (infoPtr->page < 0) infoPtr->page = 0;
1525     else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
1526         infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
1527
1528     /* Make sure the pos is inside the range */
1529
1530     if (infoPtr->curVal < infoPtr->minVal)
1531         infoPtr->curVal = infoPtr->minVal;
1532     else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1533         infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
1534
1535     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1536                  infoPtr->page, infoPtr->curVal,
1537                  infoPtr->minVal, infoPtr->maxVal );
1538
1539     /* don't change the scrollbar state if SetScrollInfo
1540      * is just called with SIF_DISABLENOSCROLL
1541      */
1542     if(!(info->fMask & SIF_ALL)) goto done;
1543
1544     /* Check if the scrollbar should be hidden or disabled */
1545
1546     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1547     {
1548         new_flags = infoPtr->flags;
1549         if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1550         {
1551             /* Hide or disable scroll-bar */
1552             if (info->fMask & SIF_DISABLENOSCROLL)
1553             {
1554                 new_flags = ESB_DISABLE_BOTH;
1555                *action |= SA_SSI_REFRESH;
1556             }
1557             else if ((nBar != SB_CTL) && bChangeParams)
1558             {
1559                 *action = SA_SSI_HIDE;
1560                 goto done;
1561             }
1562         }
1563         else  /* Show and enable scroll-bar */
1564         {
1565             new_flags = 0;
1566             if ((nBar != SB_CTL) && bChangeParams)
1567                 *action |= SA_SSI_SHOW;
1568         }
1569
1570         if (infoPtr->flags != new_flags) /* check arrow flags */
1571         {
1572             infoPtr->flags = new_flags;
1573            *action |= SA_SSI_REPAINT_ARROWS;
1574         }
1575     }
1576
1577 done:
1578     /* Return current position */
1579
1580     return infoPtr->curVal;
1581 }
1582
1583
1584 /*************************************************************************
1585  *           GetScrollInfo   (USER32.@)
1586  * GetScrollInfo can be used to retrieve the position, upper bound,
1587  * lower bound, and page size of a scrollbar control.
1588  *
1589  * RETURNS STD
1590  */
1591 BOOL WINAPI GetScrollInfo(
1592   HWND hwnd /* [in] Handle of window */ ,
1593   INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1594   LPSCROLLINFO info /* [in/out] (info.fMask [in] specifies which values are to retrieve) */)
1595 {
1596     SCROLLBAR_INFO *infoPtr;
1597
1598     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1599     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return FALSE;
1600     if ((info->cbSize != sizeof(*info)) &&
1601         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return FALSE;
1602
1603     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
1604     if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
1605     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1606         info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
1607     if (info->fMask & SIF_RANGE)
1608     {
1609         info->nMin = infoPtr->minVal;
1610         info->nMax = infoPtr->maxVal;
1611     }
1612     return (info->fMask & SIF_ALL) != 0;
1613 }
1614
1615
1616 /*************************************************************************
1617  *           SetScrollPos   (USER32.@)
1618  *
1619  * RETURNS
1620  *    Success: Scrollbar position
1621  *    Failure: 0
1622  *
1623  * REMARKS
1624  *    Note the ambiguity when 0 is returned.  Use GetLastError
1625  *    to make sure there was an error (and to know which one).
1626  */
1627 INT WINAPI SetScrollPos(
1628 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1629 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1630 INT nPos /* [in] New value */,
1631 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */ )
1632 {
1633     SCROLLINFO info;
1634     SCROLLBAR_INFO *infoPtr;
1635     INT oldPos;
1636
1637     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1638     oldPos      = infoPtr->curVal;
1639     info.cbSize = sizeof(info);
1640     info.nPos   = nPos;
1641     info.fMask  = SIF_POS;
1642     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1643     return oldPos;
1644 }
1645
1646
1647 /*************************************************************************
1648  *           GetScrollPos   (USER32.@)
1649  *
1650  * RETURNS
1651  *    Success: Current position
1652  *    Failure: 0
1653  *
1654  * REMARKS
1655  *    Note the ambiguity when 0 is returned.  Use GetLastError
1656  *    to make sure there was an error (and to know which one).
1657  */
1658 INT WINAPI GetScrollPos(
1659 HWND hwnd, /* [in] Handle of window */
1660 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1661 {
1662     SCROLLBAR_INFO *infoPtr;
1663
1664     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1665     return infoPtr->curVal;
1666 }
1667
1668
1669 /*************************************************************************
1670  *           SetScrollRange   (USER32.@)
1671  *
1672  * RETURNS STD
1673  */
1674 BOOL WINAPI SetScrollRange(
1675 HWND hwnd, /* [in] Handle of window whose scrollbar will be affected */
1676 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */
1677 INT minVal, /* [in] New minimum value */
1678 INT maxVal, /* [in] New maximum value */
1679 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1680 {
1681     SCROLLINFO info;
1682
1683     info.cbSize = sizeof(info);
1684     info.nMin   = minVal;
1685     info.nMax   = maxVal;
1686     info.fMask  = SIF_RANGE;
1687     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1688     return TRUE;
1689 }
1690
1691
1692 /*************************************************************************
1693  *           SCROLL_SetNCSbState
1694  *
1695  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1696  */
1697 INT SCROLL_SetNCSbState(HWND hwnd, int vMin, int vMax, int vPos,
1698                         int hMin, int hMax, int hPos)
1699 {
1700     INT vA, hA;
1701     SCROLLINFO vInfo, hInfo;
1702
1703     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1704     vInfo.nMin   = vMin;
1705     vInfo.nMax   = vMax;
1706     vInfo.nPos   = vPos;
1707     hInfo.nMin   = hMin;
1708     hInfo.nMax   = hMax;
1709     hInfo.nPos   = hPos;
1710     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1711
1712     SCROLL_SetScrollInfo( hwnd, SB_VERT, &vInfo, &vA );
1713     SCROLL_SetScrollInfo( hwnd, SB_HORZ, &hInfo, &hA );
1714
1715     if( !SCROLL_ShowScrollBar( hwnd, SB_BOTH,
1716                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1717     {
1718         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1719         if( vA & SA_SSI_REFRESH )
1720             SCROLL_RefreshScrollBar( hwnd, SB_VERT, FALSE, TRUE );
1721
1722         if( hA & SA_SSI_REFRESH )
1723             SCROLL_RefreshScrollBar( hwnd, SB_HORZ, FALSE, TRUE );
1724     }
1725     return 0;
1726 }
1727
1728
1729 /*************************************************************************
1730  *           GetScrollRange   (USER32.@)
1731  *
1732  * RETURNS STD
1733  */
1734 BOOL WINAPI GetScrollRange(
1735 HWND hwnd, /* [in] Handle of window */
1736 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */
1737 LPINT lpMin, /* [out] Where to store minimum value */
1738 LPINT lpMax /* [out] Where to store maximum value */)
1739 {
1740     SCROLLBAR_INFO *infoPtr;
1741
1742     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar )))
1743     {
1744         if (lpMin) lpMin = 0;
1745         if (lpMax) lpMax = 0;
1746         return FALSE;
1747     }
1748     if (lpMin) *lpMin = infoPtr->minVal;
1749     if (lpMax) *lpMax = infoPtr->maxVal;
1750     return TRUE;
1751 }
1752
1753
1754 /*************************************************************************
1755  *           SCROLL_ShowScrollBar()
1756  *
1757  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1758  */
1759 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1760                              BOOL fShowH, BOOL fShowV )
1761 {
1762     LONG style = GetWindowLongW( hwnd, GWL_STYLE );
1763
1764     TRACE("hwnd=%04x bar=%d horz=%d, vert=%d\n",
1765                     hwnd, nBar, fShowH, fShowV );
1766
1767     switch(nBar)
1768     {
1769     case SB_CTL:
1770         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1771         return TRUE;
1772
1773     case SB_BOTH:
1774     case SB_HORZ:
1775         if (fShowH)
1776         {
1777             fShowH = !(style & WS_HSCROLL);
1778             style |= WS_HSCROLL;
1779         }
1780         else  /* hide it */
1781         {
1782             fShowH = (style & WS_HSCROLL);
1783             style &= ~WS_HSCROLL;
1784         }
1785         if( nBar == SB_HORZ ) {
1786             fShowV = FALSE;
1787             break;
1788         }
1789         /* fall through */
1790
1791     case SB_VERT:
1792         if (fShowV)
1793         {
1794             fShowV = !(style & WS_VSCROLL);
1795             style |= WS_VSCROLL;
1796         }
1797         else  /* hide it */
1798         {
1799             fShowV = (style & WS_VSCROLL);
1800             style &= ~WS_VSCROLL;
1801         }
1802         if ( nBar == SB_VERT )
1803            fShowH = FALSE;
1804         break;
1805
1806     default:
1807         return FALSE;  /* Nothing to do! */
1808     }
1809
1810     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1811     {
1812         WIN_SetStyle( hwnd, style );
1813         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1814                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1815         return TRUE;
1816     }
1817     return FALSE; /* no frame changes */
1818 }
1819
1820
1821 /*************************************************************************
1822  *           ShowScrollBar   (USER32.@)
1823  *
1824  * RETURNS STD
1825  */
1826 BOOL WINAPI ShowScrollBar(
1827 HWND hwnd, /* [in] Handle of window whose scrollbar(s) will be affected   */
1828 INT nBar, /* [in] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1829 BOOL fShow /* [in] TRUE = show, FALSE = hide  */)
1830 {
1831     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1832                                       (nBar == SB_HORZ) ? 0 : fShow );
1833     return TRUE;
1834 }
1835
1836
1837 /*************************************************************************
1838  *           EnableScrollBar   (USER32.@)
1839  */
1840 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1841 {
1842     BOOL bFineWithMe;
1843     SCROLLBAR_INFO *infoPtr;
1844
1845     TRACE("%04x %d %d\n", hwnd, nBar, flags );
1846
1847     flags &= ESB_DISABLE_BOTH;
1848
1849     if (nBar == SB_BOTH)
1850     {
1851         if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, SB_VERT ))) return FALSE;
1852         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1853         {
1854             infoPtr->flags = flags;
1855             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1856         }
1857         nBar = SB_HORZ;
1858     }
1859     else
1860         bFineWithMe = TRUE;
1861
1862     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1863     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1864     infoPtr->flags = flags;
1865
1866     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1867     return TRUE;
1868 }