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
   8 #include "wine/winuser16.h"
   9 #include "scroll.h"
  10 #include "heap.h"
  11 #include "win.h"
  12 #include "debugtools.h"
  13 #include "tweak.h"
  14
  15 DEFAULT_DEBUG_CHANNEL(scroll)
  16
  17
  18 static HBITMAP hUpArrow = 0;
  19 static HBITMAP hDnArrow = 0;
  20 static HBITMAP hLfArrow = 0;
  21 static HBITMAP hRgArrow = 0;
  22 static HBITMAP hUpArrowD = 0;
  23 static HBITMAP hDnArrowD = 0;
  24 static HBITMAP hLfArrowD = 0;
  25 static HBITMAP hRgArrowD = 0;
  26 static HBITMAP hUpArrowI = 0;
  27 static HBITMAP hDnArrowI = 0;
  28 static HBITMAP hLfArrowI = 0;
  29 static HBITMAP hRgArrowI = 0;
  30
  31 #define TOP_ARROW(flags,pressed) \
  32    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  33 #define BOTTOM_ARROW(flags,pressed) \
  34    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  35 #define LEFT_ARROW(flags,pressed) \
  36    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  37 #define RIGHT_ARROW(flags,pressed) \
  38    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  39
  40
  41   /* Minimum size of the rectangle between the arrows */
  42 #define SCROLL_MIN_RECT  4
  43
  44   /* Minimum size of the thumb in pixels */
  45 #define SCROLL_MIN_THUMB 6
  46
  47   /* Overlap between arrows and thumb */
  48 #define SCROLL_ARROW_THUMB_OVERLAP 1
  49
  50   /* Delay (in ms) before first repetition when holding the button down */
  51 #define SCROLL_FIRST_DELAY   200
  52
  53   /* Delay (in ms) between scroll repetitions */
  54 #define SCROLL_REPEAT_DELAY  50
  55
  56   /* Scroll timer id */
  57 #define SCROLL_TIMER   0
  58
  59   /* Scroll-bar hit testing */
  60 enum SCROLL_HITTEST
  61 {
  62     SCROLL_NOWHERE,      /* Outside the scroll bar */
  63     SCROLL_TOP_ARROW,    /* Top or left arrow */
  64     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  65     SCROLL_THUMB,        /* Thumb rectangle */
  66     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  67     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  68 };
  69
  70  /* What to do after SCROLL_SetScrollInfo() */
  71 #define SA_SSI_HIDE             0x0001
  72 #define SA_SSI_SHOW             0x0002
  73 #define SA_SSI_REFRESH          0x0004
  74 #define SA_SSI_REPAINT_ARROWS   0x0008
  75
  76  /* Thumb-tracking info */
  77 static HWND SCROLL_TrackingWin = 0;
  78 static INT  SCROLL_TrackingBar = 0;
  79 static INT  SCROLL_TrackingPos = 0;
  80 static INT  SCROLL_TrackingVal = 0;
  81  /* Hit test code of the last button-down event */
  82 static enum SCROLL_HITTEST SCROLL_trackHitTest;
  83 static BOOL SCROLL_trackVertical;
  84
  85  /* Is the moving thumb being displayed? */
  86 static BOOL SCROLL_MovingThumb = FALSE;
  87
  88  /* Local functions */
  89 static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
  90                                     BOOL fShowH, BOOL fShowV );
  91 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
  92                                    const SCROLLINFO *info, INT *action );
  93
  94 /***********************************************************************
  95  *           SCROLL_LoadBitmaps
  96  */
  97 static void SCROLL_LoadBitmaps(void)
  98 {
  99     hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
 100     hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
 101     hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
 102     hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
 103     hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
 104     hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
 105     hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
 106     hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
 107     hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
 108     hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
 109     hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
 110     hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
 111 }
 112
 113
 114 /***********************************************************************
 115  *           SCROLL_GetPtrScrollInfo
 116  */
 117 static SCROLLBAR_INFO *SCROLL_GetPtrScrollInfo( WND* wndPtr, INT nBar )
 118 {
 119     SCROLLBAR_INFO *infoPtr;
 120
 121     if (!wndPtr) return NULL;
 122     switch(nBar)
 123     {
 124         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 125         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 126         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 127         default:      return NULL;
 128     }
 129
 130     if (!infoPtr)  /* Create the info structure if needed */
 131     {
 132         if ((infoPtr = HeapAlloc( SystemHeap, 0, sizeof(SCROLLBAR_INFO) )))
 133         {
 134             infoPtr->MinVal = infoPtr->CurVal = infoPtr->Page = 0;
 135             infoPtr->MaxVal = 100;
 136             infoPtr->flags  = ESB_ENABLE_BOTH;
 137             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 138             else wndPtr->pVScroll = infoPtr;
 139         }
 140         if (!hUpArrow) SCROLL_LoadBitmaps();
 141     }
 142     return infoPtr;
 143 }
 144
 145
 146 /***********************************************************************
 147  *           SCROLL_GetScrollInfo
 148  */
 149 static SCROLLBAR_INFO *SCROLL_GetScrollInfo( HWND hwnd, INT nBar )
 150 {
 151    SCROLLBAR_INFO *retvalue;
 152    WND *wndPtr = WIN_FindWndPtr( hwnd );
 153    retvalue = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 154    WIN_ReleaseWndPtr(wndPtr);
 155    return retvalue;
 156 }
 157
 158
 159 /***********************************************************************
 160  *           SCROLL_GetScrollBarRect
 161  *
 162  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 163  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 164  * 'arrowSize' returns the width or height of an arrow (depending on
 165  * the orientation of the scrollbar), 'thumbSize' returns the size of
 166  * the thumb, and 'thumbPos' returns the position of the thumb
 167  * relative to the left or to the top.
 168  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 169  */
 170 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 171                                        INT *arrowSize, INT *thumbSize,
 172                                        INT *thumbPos )
 173 {
 174     INT pixels;
 175     BOOL vertical;
 176     WND *wndPtr = WIN_FindWndPtr( hwnd );
 177
 178     switch(nBar)
 179     {
 180       case SB_HORZ:
 181         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 182         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 183         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 184         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 185         if(wndPtr->dwStyle & WS_BORDER) {
 186           lprect->left--;
 187           lprect->right++;
 188         } else if(wndPtr->dwStyle & WS_VSCROLL)
 189           lprect->right++;
 190         vertical = FALSE;
 191         break;
 192
 193       case SB_VERT:
 194         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 195         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 196         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 197         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 198         if(wndPtr->dwStyle & WS_BORDER) {
 199           lprect->top--;
 200           lprect->bottom++;
 201         } else if(wndPtr->dwStyle & WS_HSCROLL)
 202           lprect->bottom++;
 203         vertical = TRUE;
 204         break;
 205
 206       case SB_CTL:
 207         GetClientRect( hwnd, lprect );
 208         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 209         break;
 210
 211     default:
 212         WIN_ReleaseWndPtr(wndPtr);
 213         return FALSE;
 214     }
 215
 216     if (vertical) pixels = lprect->bottom - lprect->top;
 217     else pixels = lprect->right - lprect->left;
 218
 219     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 220     {
 221         if (pixels > SCROLL_MIN_RECT)
 222             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 223         else
 224             *arrowSize = 0;
 225         *thumbPos = *thumbSize = 0;
 226     }
 227     else
 228     {
 229         SCROLLBAR_INFO *info = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 230
 231         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 232         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 233
 234         if (info->Page)
 235         {
 236             *thumbSize = pixels * info->Page / (info->MaxVal-info->MinVal+1);
 237             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 238         }
 239         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 240
 241         if (((pixels -= *thumbSize ) < 0) ||
 242             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 243         {
 244             /* Rectangle too small or scrollbar disabled -> no thumb */
 245             *thumbPos = *thumbSize = 0;
 246         }
 247         else
 248         {
 249             INT max = info->MaxVal - MAX( info->Page-1, 0 );
 250             if (info->MinVal >= max)
 251                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 252             else
 253                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 254                  + pixels * (info->CurVal-info->MinVal) / (max - info->MinVal);
 255         }
 256     }
 257     WIN_ReleaseWndPtr(wndPtr);
 258     return vertical;
 259 }
 260
 261
 262 /***********************************************************************
 263  *           SCROLL_GetThumbVal
 264  *
 265  * Compute the current scroll position based on the thumb position in pixels
 266  * from the top of the scroll-bar.
 267  */
 268 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 269                                   BOOL vertical, INT pos )
 270 {
 271     INT thumbSize;
 272     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 273
 274     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 275         return infoPtr->MinVal;
 276
 277     if (infoPtr->Page)
 278     {
 279         thumbSize = pixels * infoPtr->Page/(infoPtr->MaxVal-infoPtr->MinVal+1);
 280         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 281     }
 282     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 283
 284     if ((pixels -= thumbSize) <= 0) return infoPtr->MinVal;
 285
 286     pos = MAX( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 287     if (pos > pixels) pos = pixels;
 288
 289     if (!infoPtr->Page) pos *= infoPtr->MaxVal - infoPtr->MinVal;
 290     else pos *= infoPtr->MaxVal - infoPtr->MinVal - infoPtr->Page + 1;
 291     return infoPtr->MinVal + ((pos + pixels / 2) / pixels);
 292 }
 293
 294 /***********************************************************************
 295  *           SCROLL_PtInRectEx
 296  */
 297 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 298 {
 299     RECT rect = *lpRect;
 300
 301     if (vertical)
 302     {
 303         rect.left -= lpRect->right - lpRect->left;
 304         rect.right += lpRect->right - lpRect->left;
 305     }
 306     else
 307     {
 308         rect.top -= lpRect->bottom - lpRect->top;
 309         rect.bottom += lpRect->bottom - lpRect->top;
 310     }
 311     return PtInRect( &rect, pt );
 312 }
 313
 314 /***********************************************************************
 315  *           SCROLL_ClipPos
 316  */
 317 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 318 {
 319     if( pt.x < lpRect->left )
 320         pt.x = lpRect->left;
 321     else
 322     if( pt.x > lpRect->right )
 323         pt.x = lpRect->right;
 324
 325     if( pt.y < lpRect->top )
 326         pt.y = lpRect->top;
 327     else
 328     if( pt.y > lpRect->bottom )
 329         pt.y = lpRect->bottom;
 330
 331     return pt;
 332 }
 333
 334
 335 /***********************************************************************
 336  *           SCROLL_HitTest
 337  *
 338  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 339  */
 340 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 341                                            POINT pt, BOOL bDragging )
 342 {
 343     INT arrowSize, thumbSize, thumbPos;
 344     RECT rect;
 345
 346     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 347                                            &arrowSize, &thumbSize, &thumbPos );
 348
 349     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 350          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 351
 352     if (vertical)
 353     {
 354         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 355         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 356         if (!thumbPos) return SCROLL_TOP_RECT;
 357         pt.y -= rect.top;
 358         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 359         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 360     }
 361     else  /* horizontal */
 362     {
 363         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 364         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 365         if (!thumbPos) return SCROLL_TOP_RECT;
 366         pt.x -= rect.left;
 367         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 368         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 369     }
 370     return SCROLL_THUMB;
 371 }
 372
 373
 374 /***********************************************************************
 375  *           SCROLL_DrawArrows
 376  *
 377  * Draw the scroll bar arrows.
 378  */
 379 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 380                                RECT *rect, INT arrowSize, BOOL vertical,
 381                                BOOL top_pressed, BOOL bottom_pressed )
 382 {
 383     HDC hdcMem = CreateCompatibleDC( hdc );
 384     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 385                                     TOP_ARROW(infoPtr->flags, top_pressed)
 386                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 387     INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 1 : 0;
 388
 389     if (offset) arrowSize--;
 390     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 391     StretchBlt( hdc, rect->left+offset, rect->top+offset,
 392                   vertical ? rect->right-(rect->left+offset) : arrowSize,
 393                   vertical ? arrowSize : rect->bottom-(rect->top+offset),
 394                   hdcMem, 0, 0,
 395                   GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 396                   SRCCOPY );
 397
 398     SelectObject( hdcMem, vertical ?
 399                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 400                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 401     if (vertical)
 402         StretchBlt( hdc, (rect->left+offset), rect->bottom - arrowSize,
 403                       rect->right - (rect->left+offset), arrowSize,
 404                       hdcMem, 0, 0,
 405                       GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 406                       SRCCOPY );
 407     else
 408         StretchBlt( hdc, rect->right - arrowSize, rect->top+offset,
 409                       arrowSize, rect->bottom - (rect->top+offset),
 410                       hdcMem, 0, 0,
 411                       GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
 412                       SRCCOPY );
 413     SelectObject( hdcMem, hbmpPrev );
 414     DeleteDC( hdcMem );
 415 }
 416
 417
 418 /***********************************************************************
 419  *           SCROLL_DrawMovingThumb
 420  *
 421  * Draw the moving thumb rectangle.
 422  */
 423 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 424                                     INT arrowSize, INT thumbSize )
 425 {
 426     RECT r = *rect;
 427     if (vertical)
 428     {
 429         r.top += SCROLL_TrackingPos;
 430         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 431             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 432         if (r.top + thumbSize >
 433                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 434             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 435                                                                   - thumbSize;
 436         r.bottom = r.top + thumbSize;
 437     }
 438     else
 439     {
 440         r.left += SCROLL_TrackingPos;
 441         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 442             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 443         if (r.left + thumbSize >
 444                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 445             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 446                                                                   - thumbSize;
 447         r.right = r.left + thumbSize;
 448     }
 449     DrawFocusRect( hdc, &r );
 450     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 451 }
 452
 453
 454 /***********************************************************************
 455  *           SCROLL_DrawInterior
 456  *
 457  * Draw the scroll bar interior (everything except the arrows).
 458  */
 459 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 460                                  RECT *rect, INT arrowSize,
 461                                  INT thumbSize, INT thumbPos,
 462                                  UINT flags, BOOL vertical,
 463                                  BOOL top_selected, BOOL bottom_selected )
 464 {
 465     RECT r;
 466     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 467
 468     if (Save_SCROLL_MovingThumb &&
 469         (SCROLL_TrackingWin == hwnd) &&
 470         (SCROLL_TrackingBar == nBar))
 471         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 472
 473       /* Select the correct brush and pen */
 474
 475     SelectObject( hdc, GetSysColorPen(COLOR_WINDOWFRAME) );
 476     if ((flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 477     {
 478           /* This ought to be the color of the parent window */
 479         SelectObject( hdc, GetSysColorBrush(COLOR_WINDOW) );
 480     }
 481     else
 482     {
 483         if (nBar == SB_CTL)  /* Only scrollbar controls send WM_CTLCOLOR */
 484         {
 485             HBRUSH hbrush = SendMessageA(GetParent(hwnd),
 486                                              WM_CTLCOLORSCROLLBAR, hdc, hwnd );
 487             SelectObject( hdc, hbrush );
 488         }
 489         else SelectObject( hdc, GetSysColorBrush(COLOR_SCROLLBAR) );
 490     }
 491
 492       /* Calculate the scroll rectangle */
 493
 494     r = *rect;
 495     if (vertical)
 496     {
 497         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 498         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 499     }
 500     else
 501     {
 502         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 503         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 504     }
 505
 506       /* Draw the scroll bar frame */
 507
 508         /* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
 509     if (TWEAK_WineLook == WIN31_LOOK)
 510         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 511
 512       /* Draw the scroll rectangles and thumb */
 513
 514     if (!thumbPos)  /* No thumb to draw */
 515     {
 516         PatBlt( hdc, r.left+1, r.top+1, r.right - r.left - 2,
 517                   r.bottom - r.top - 2, PATCOPY );
 518         return;
 519     }
 520
 521     if (vertical)
 522     {
 523         PatBlt( hdc, r.left + 1, r.top + 1,
 524                   r.right - r.left - 2,
 525                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - 1,
 526                   top_selected ? 0x0f0000 : PATCOPY );
 527         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 528         PatBlt( hdc, r.left + 1, r.top + thumbSize,
 529                   r.right - r.left - 2,
 530                   r.bottom - r.top - thumbSize - 1,
 531                   bottom_selected ? 0x0f0000 : PATCOPY );
 532         r.bottom = r.top + thumbSize;
 533     }
 534     else  /* horizontal */
 535     {
 536         PatBlt( hdc, r.left + 1, r.top + 1,
 537                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - 1,
 538                   r.bottom - r.top - 2,
 539                   top_selected ? 0x0f0000 : PATCOPY );
 540         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 541         PatBlt( hdc, r.left + thumbSize, r.top + 1,
 542                   r.right - r.left - thumbSize - 1,
 543                   r.bottom - r.top - 2,
 544                   bottom_selected ? 0x0f0000 : PATCOPY );
 545         r.right = r.left + thumbSize;
 546     }
 547
 548       /* Draw the thumb */
 549
 550     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 551     if (TWEAK_WineLook == WIN31_LOOK)
 552     {
 553         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 554         r.top++, r.left++;
 555     }
 556     else
 557     {
 558         r.top++, r.left++;
 559         r.bottom--; r.right--;
 560         Rectangle( hdc, r.left, r.top, r.right-1, r.bottom-1 );
 561     }
 562     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 563
 564     if (Save_SCROLL_MovingThumb &&
 565         (SCROLL_TrackingWin == hwnd) &&
 566         (SCROLL_TrackingBar == nBar))
 567         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 568 }
 569
 570
 571 /***********************************************************************
 572  *           SCROLL_DrawScrollBar
 573  *
 574  * Redraw the whole scrollbar.
 575  */
 576 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 577                            BOOL arrows, BOOL interior )
 578 {
 579     INT arrowSize, thumbSize, thumbPos;
 580     RECT rect;
 581     BOOL vertical;
 582     WND *wndPtr = WIN_FindWndPtr( hwnd );
 583     SCROLLBAR_INFO *infoPtr = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 584     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 585
 586     if (!wndPtr || !infoPtr ||
 587         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 588         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 589     if (!WIN_IsWindowDrawable( wndPtr, FALSE )) goto END;
 590
 591     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 592                                         &arrowSize, &thumbSize, &thumbPos );
 593
 594     if (Save_SCROLL_MovingThumb &&
 595         (SCROLL_TrackingWin == hwnd) &&
 596         (SCROLL_TrackingBar == nBar))
 597         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 598
 599       /* Draw the arrows */
 600
 601     if (arrows && arrowSize)
 602     {
 603         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 604             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 605                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 606                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 607         else
 608             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 609                                                                FALSE, FALSE );
 610     }
 611     if( interior )
 612         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 613                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 614
 615     if (Save_SCROLL_MovingThumb &&
 616         (SCROLL_TrackingWin == hwnd) &&
 617         (SCROLL_TrackingBar == nBar))
 618         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 619
 620 END:
 621     WIN_ReleaseWndPtr(wndPtr);
 622 }
 623
 624
 625 /***********************************************************************
 626  *           SCROLL_RefreshScrollBar
 627  *
 628  * Repaint the scroll bar interior after a SetScrollRange() or
 629  * SetScrollPos() call.
 630  */
 631 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 632                                      BOOL arrows, BOOL interior )
 633 {
 634     HDC hdc = GetDCEx( hwnd, 0,
 635                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 636     if (!hdc) return;
 637
 638     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 639     ReleaseDC( hwnd, hdc );
 640 }
 641
 642
 643 /***********************************************************************
 644  *           SCROLL_HandleKbdEvent
 645  *
 646  * Handle a keyboard event (only for SB_CTL scrollbars).
 647  */
 648 static void SCROLL_HandleKbdEvent( HWND hwnd, WPARAM wParam )
 649 {
 650     WND *wndPtr = WIN_FindWndPtr( hwnd );
 651     WPARAM msg;
 652
 653     switch(wParam)
 654     {
 655     case VK_PRIOR: msg = SB_PAGEUP; break;
 656     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 657     case VK_HOME:  msg = SB_TOP; break;
 658     case VK_END:   msg = SB_BOTTOM; break;
 659     case VK_UP:    msg = SB_LINEUP; break;
 660     case VK_DOWN:  msg = SB_LINEDOWN; break;
 661     default:
 662         WIN_ReleaseWndPtr(wndPtr);
 663         return;
 664     }
 665     SendMessageA( GetParent(hwnd),
 666                     (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 667                     msg, hwnd );
 668     WIN_ReleaseWndPtr(wndPtr);
 669 }
 670
 671
 672 /***********************************************************************
 673  *           SCROLL_HandleScrollEvent
 674  *
 675  * Handle a mouse or timer event for the scrollbar.
 676  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 677  * windows coordinates.
 678  */
 679 void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 680 {
 681       /* Previous mouse position for timer events */
 682     static POINT prevPt;
 683       /* Thumb position when tracking started. */
 684     static UINT trackThumbPos;
 685       /* Position in the scroll-bar of the last button-down event. */
 686     static INT lastClickPos;
 687       /* Position in the scroll-bar of the last mouse event. */
 688     static INT lastMousePos;
 689
 690     enum SCROLL_HITTEST hittest;
 691     HWND hwndOwner, hwndCtl;
 692     BOOL vertical;
 693     INT arrowSize, thumbSize, thumbPos;
 694     RECT rect;
 695     HDC hdc;
 696
 697     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 698     if (!infoPtr) return;
 699     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 700                   return;
 701
 702     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 703     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 704                                         &arrowSize, &thumbSize, &thumbPos );
 705     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 706     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 707
 708     switch(msg)
 709     {
 710       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 711           SCROLL_trackVertical = vertical;
 712           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 713           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 714           lastMousePos  = lastClickPos;
 715           trackThumbPos = thumbPos;
 716           prevPt = pt;
 717           SetCapture( hwnd );
 718           if (nBar == SB_CTL) SetFocus( hwnd );
 719           break;
 720
 721       case WM_MOUSEMOVE:
 722           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 723           prevPt = pt;
 724           break;
 725
 726       case WM_LBUTTONUP:
 727           hittest = SCROLL_NOWHERE;
 728           ReleaseCapture();
 729           break;
 730
 731       case WM_SYSTIMER:
 732           pt = prevPt;
 733           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 734           break;
 735
 736       default:
 737           return;  /* Should never happen */
 738     }
 739
 740     TRACE("Event: hwnd=%04x bar=%d msg=%x pt=%ld,%ld hit=%d\n",
 741                  hwnd, nBar, msg, pt.x, pt.y, hittest );
 742
 743     switch(SCROLL_trackHitTest)
 744     {
 745     case SCROLL_NOWHERE:  /* No tracking in progress */
 746         break;
 747
 748     case SCROLL_TOP_ARROW:
 749         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 750                            (hittest == SCROLL_trackHitTest), FALSE );
 751         if (hittest == SCROLL_trackHitTest)
 752         {
 753             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 754             {
 755                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 756                                 SB_LINEUP, hwndCtl );
 757                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 758                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 759                                   (TIMERPROC)0 );
 760             }
 761         }
 762         else KillSystemTimer( hwnd, SCROLL_TIMER );
 763         break;
 764
 765     case SCROLL_TOP_RECT:
 766         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 767                              thumbPos, infoPtr->flags, vertical,
 768                              (hittest == SCROLL_trackHitTest), FALSE );
 769         if (hittest == SCROLL_trackHitTest)
 770         {
 771             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 772             {
 773                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 774                                 SB_PAGEUP, hwndCtl );
 775                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 776                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 777                                   (TIMERPROC)0 );
 778             }
 779         }
 780         else KillSystemTimer( hwnd, SCROLL_TIMER );
 781         break;
 782
 783     case SCROLL_THUMB:
 784         if (msg == WM_LBUTTONDOWN)
 785         {
 786             SCROLL_TrackingWin = hwnd;
 787             SCROLL_TrackingBar = nBar;
 788             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
 789             if (!SCROLL_MovingThumb)
 790                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 791         }
 792         else if (msg == WM_LBUTTONUP)
 793         {
 794             if (SCROLL_MovingThumb)
 795                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 796             SCROLL_TrackingWin = 0;
 797             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 798                                  thumbPos, infoPtr->flags, vertical,
 799                                  FALSE, FALSE );
 800         }
 801         else  /* WM_MOUSEMOVE */
 802         {
 803             UINT pos;
 804
 805             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
 806             else
 807             {
 808                 pt = SCROLL_ClipPos( &rect, pt );
 809                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 810             }
 811             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
 812             {
 813                 if (SCROLL_MovingThumb)
 814                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 815                                         arrowSize, thumbSize );
 816                 lastMousePos = pos;
 817                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
 818                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
 819                                                          vertical,
 820                                                          SCROLL_TrackingPos );
 821                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 822                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
 823                                 hwndCtl );
 824                 if (!SCROLL_MovingThumb)
 825                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 826                                         arrowSize, thumbSize );
 827             }
 828         }
 829         break;
 830
 831     case SCROLL_BOTTOM_RECT:
 832         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 833                              thumbPos, infoPtr->flags, vertical,
 834                              FALSE, (hittest == SCROLL_trackHitTest) );
 835         if (hittest == SCROLL_trackHitTest)
 836         {
 837             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 838             {
 839                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 840                                 SB_PAGEDOWN, hwndCtl );
 841                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 842                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 843                                   (TIMERPROC)0 );
 844             }
 845         }
 846         else KillSystemTimer( hwnd, SCROLL_TIMER );
 847         break;
 848
 849     case SCROLL_BOTTOM_ARROW:
 850         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 851                            FALSE, (hittest == SCROLL_trackHitTest) );
 852         if (hittest == SCROLL_trackHitTest)
 853         {
 854             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 855             {
 856                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 857                                 SB_LINEDOWN, hwndCtl );
 858                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 859                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 860                                   (TIMERPROC)0 );
 861             }
 862         }
 863         else KillSystemTimer( hwnd, SCROLL_TIMER );
 864         break;
 865     }
 866
 867     if (msg == WM_LBUTTONUP)
 868     {
 869         hittest = SCROLL_trackHitTest;
 870         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
 871
 872         if (hittest == SCROLL_THUMB)
 873         {
 874             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 875                                  trackThumbPos + lastMousePos - lastClickPos );
 876             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 877                             MAKEWPARAM( SB_THUMBPOSITION, val ), hwndCtl );
 878         }
 879         else
 880             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 881                             SB_ENDSCROLL, hwndCtl );
 882     }
 883
 884     ReleaseDC( hwnd, hdc );
 885 }
 886
 887
 888 /***********************************************************************
 889  *           ScrollBarWndProc
 890  */
 891 LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam,
 892                                  LPARAM lParam )
 893 {
 894     switch(message)
 895     {
 896     case WM_CREATE:
 897         {
 898             CREATESTRUCTA *lpCreat = (CREATESTRUCTA *)lParam;
 899             if (lpCreat->style & SBS_SIZEBOX)
 900             {
 901                 FIXME("Unimplemented style SBS_SIZEBOX.\n" );
 902                 return 0;
 903             }
 904
 905             if (lpCreat->style & SBS_VERT)
 906             {
 907                 if (lpCreat->style & SBS_LEFTALIGN)
 908                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 909                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
 910                 else if (lpCreat->style & SBS_RIGHTALIGN)
 911                     MoveWindow( hwnd,
 912                                   lpCreat->x+lpCreat->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
 913                                   lpCreat->y,
 914                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
 915             }
 916             else  /* SBS_HORZ */
 917             {
 918                 if (lpCreat->style & SBS_TOPALIGN)
 919                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 920                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
 921                 else if (lpCreat->style & SBS_BOTTOMALIGN)
 922                     MoveWindow( hwnd,
 923                                   lpCreat->x,
 924                                   lpCreat->y+lpCreat->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
 925                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
 926             }
 927         }
 928         if (!hUpArrow) SCROLL_LoadBitmaps();
 929         TRACE("ScrollBar creation, hwnd=%04x\n", hwnd );
 930         return 0;
 931
 932     case WM_LBUTTONDOWN:
 933     case WM_LBUTTONUP:
 934     case WM_MOUSEMOVE:
 935     case WM_SYSTIMER:
 936         {
 937             POINT pt;
 938             CONV_POINT16TO32( (POINT16 *)&lParam, &pt );
 939             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
 940         }
 941         break;
 942
 943     case WM_KEYDOWN:
 944         SCROLL_HandleKbdEvent( hwnd, wParam );
 945         break;
 946
 947     case WM_ERASEBKGND:
 948          return 1;
 949
 950     case WM_GETDLGCODE:
 951          return DLGC_WANTARROWS; /* Windows returns this value */
 952
 953     case WM_PAINT:
 954         {
 955             PAINTSTRUCT ps;
 956             HDC hdc = BeginPaint( hwnd, &ps );
 957             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
 958             EndPaint( hwnd, &ps );
 959         }
 960         break;
 961
 962     case SBM_SETPOS16:
 963     case SBM_SETPOS:
 964         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
 965
 966     case SBM_GETPOS16:
 967     case SBM_GETPOS:
 968         return GetScrollPos( hwnd, SB_CTL );
 969
 970     case SBM_SETRANGE16:
 971         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
 972                           wParam  /* FIXME: Is this correct? */ );
 973         return 0;
 974
 975     case SBM_SETRANGE:
 976         SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
 977         return 0;  /* FIXME: return previous position */
 978
 979     case SBM_GETRANGE16:
 980         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
 981         return 0;
 982
 983     case SBM_GETRANGE:
 984         GetScrollRange( hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam );
 985         return 0;
 986
 987     case SBM_ENABLE_ARROWS16:
 988     case SBM_ENABLE_ARROWS:
 989         return EnableScrollBar( hwnd, SB_CTL, wParam );
 990
 991     case SBM_SETRANGEREDRAW:
 992         SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
 993         return 0;  /* FIXME: return previous position */
 994
 995     case SBM_SETSCROLLINFO:
 996         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
 997
 998     case SBM_GETSCROLLINFO:
 999         return GetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam );
1000
1001     case 0x00e5:
1002     case 0x00e7:
1003     case 0x00e8:
1004     case 0x00eb:
1005     case 0x00ec:
1006     case 0x00ed:
1007     case 0x00ee:
1008     case 0x00ef:
1009         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1010                     message, wParam, lParam );
1011         break;
1012
1013     default:
1014         if (message >= WM_USER)
1015             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1016                          message, wParam, lParam );
1017         return DefWindowProcA( hwnd, message, wParam, lParam );
1018     }
1019     return 0;
1020 }
1021
1022
1023 /*************************************************************************
1024  *           SetScrollInfo16   (USER.475)
1025  */
1026 INT16 WINAPI SetScrollInfo16( HWND16 hwnd, INT16 nBar, const SCROLLINFO *info,
1027                               BOOL16 bRedraw )
1028 {
1029     return (INT16)SetScrollInfo( hwnd, nBar, info, bRedraw );
1030 }
1031
1032
1033 /*************************************************************************
1034  *           SetScrollInfo32   (USER32.501)
1035  * SetScrollInfo32 can be used to set the position, upper bound,
1036  * lower bound, and page size of a scrollbar control.
1037  *
1038  * RETURNS
1039  *    Scrollbar position
1040  *
1041  * NOTE
1042  *    For 100 lines of text to be displayed in a window of 25 lines,
1043  *  one would for instance use info->nMin=0, info->nMax=75
1044  *  (corresponding to the 76 different positions of the window on
1045  *  the text), and info->nPage=25.
1046  */
1047 INT WINAPI SetScrollInfo(
1048 HWND hwnd /* [I] Handle of window whose scrollbar will be affected */,
1049 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1050 const SCROLLINFO *info /* [I] Specifies what to change and new values */,
1051 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
1052 {
1053     INT action;
1054     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1055
1056     if( action & SA_SSI_HIDE )
1057         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1058     else
1059     {
1060         if( action & SA_SSI_SHOW )
1061             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1062                 return retVal; /* SetWindowPos() already did the painting */
1063
1064         if( bRedraw && (action & SA_SSI_REFRESH))
1065             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1066         else if( action & SA_SSI_REPAINT_ARROWS )
1067             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1068     }
1069     return retVal;
1070 }
1071
1072 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1073                             const SCROLLINFO *info, INT *action  )
1074 {
1075     /* Update the scrollbar state and set action flags according to
1076      * what has to be done graphics wise. */
1077
1078     SCROLLBAR_INFO *infoPtr;
1079     UINT new_flags;
1080
1081     dbg_decl_str(scroll, 256);
1082
1083    *action = 0;
1084
1085     if (!(infoPtr = SCROLL_GetScrollInfo(hwnd, nBar))) return 0;
1086     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1087     if ((info->cbSize != sizeof(*info)) &&
1088         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1089
1090     /* Set the page size */
1091
1092     if (info->fMask & SIF_PAGE)
1093     {
1094         dsprintf(scroll, " page=%d", info->nPage );
1095         if( infoPtr->Page != info->nPage )
1096         {
1097             infoPtr->Page = info->nPage;
1098            *action |= SA_SSI_REFRESH;
1099         }
1100     }
1101
1102     /* Set the scroll pos */
1103
1104     if (info->fMask & SIF_POS)
1105     {
1106         dsprintf(scroll, " pos=%d", info->nPos );
1107         if( infoPtr->CurVal != info->nPos )
1108         {
1109             infoPtr->CurVal = info->nPos;
1110            *action |= SA_SSI_REFRESH;
1111         }
1112     }
1113
1114     /* Set the scroll range */
1115
1116     if (info->fMask & SIF_RANGE)
1117     {
1118         dsprintf(scroll, " min=%d max=%d", info->nMin, info->nMax );
1119
1120         /* Invalid range -> range is set to (0,0) */
1121         if ((info->nMin > info->nMax) ||
1122             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1123         {
1124             infoPtr->MinVal = 0;
1125             infoPtr->MaxVal = 0;
1126         }
1127         else
1128         {
1129             if( infoPtr->MinVal != info->nMin ||
1130                 infoPtr->MaxVal != info->nMax )
1131             {
1132                *action |= SA_SSI_REFRESH;
1133                 infoPtr->MinVal = info->nMin;
1134                 infoPtr->MaxVal = info->nMax;
1135             }
1136         }
1137     }
1138
1139     TRACE("hwnd=%04x bar=%d %s\n",
1140                     hwnd, nBar, dbg_str(scroll));
1141
1142     /* Make sure the page size is valid */
1143
1144     if (infoPtr->Page < 0) infoPtr->Page = 0;
1145     else if (infoPtr->Page > infoPtr->MaxVal - infoPtr->MinVal + 1 )
1146         infoPtr->Page = infoPtr->MaxVal - infoPtr->MinVal + 1;
1147
1148     /* Make sure the pos is inside the range */
1149
1150     if (infoPtr->CurVal < infoPtr->MinVal)
1151         infoPtr->CurVal = infoPtr->MinVal;
1152     else if (infoPtr->CurVal > infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 ))
1153         infoPtr->CurVal = infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 );
1154
1155     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1156                  infoPtr->Page, infoPtr->CurVal,
1157                  infoPtr->MinVal, infoPtr->MaxVal );
1158
1159     /* Check if the scrollbar should be hidden or disabled */
1160
1161     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1162     {
1163         new_flags = infoPtr->flags;
1164         if (infoPtr->MinVal >= infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 ))
1165         {
1166             /* Hide or disable scroll-bar */
1167             if (info->fMask & SIF_DISABLENOSCROLL)
1168             {
1169                 new_flags = ESB_DISABLE_BOTH;
1170                *action |= SA_SSI_REFRESH;
1171             }
1172             else if (nBar != SB_CTL)
1173             {
1174                 *action = SA_SSI_HIDE;
1175                 goto done;
1176             }
1177         }
1178         else  /* Show and enable scroll-bar */
1179         {
1180             new_flags = 0;
1181             if (nBar != SB_CTL)
1182                 *action |= SA_SSI_SHOW;
1183         }
1184
1185         if (infoPtr->flags != new_flags) /* check arrow flags */
1186         {
1187             infoPtr->flags = new_flags;
1188            *action |= SA_SSI_REPAINT_ARROWS;
1189         }
1190     }
1191
1192 done:
1193     /* Return current position */
1194
1195     return infoPtr->CurVal;
1196 }
1197
1198
1199 /*************************************************************************
1200  *           GetScrollInfo16   (USER.476)
1201  */
1202 BOOL16 WINAPI GetScrollInfo16( HWND16 hwnd, INT16 nBar, LPSCROLLINFO info )
1203 {
1204     return GetScrollInfo( hwnd, nBar, info );
1205 }
1206
1207
1208 /*************************************************************************
1209  *           GetScrollInfo32   (USER32.284)
1210  * GetScrollInfo32 can be used to retrieve the position, upper bound,
1211  * lower bound, and page size of a scrollbar control.
1212  *
1213  * RETURNS STD
1214  */
1215 BOOL WINAPI GetScrollInfo(
1216   HWND hwnd /* [I] Handle of window */ ,
1217   INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1218   LPSCROLLINFO info /* [IO] (info.fMask [I] specifies which values are to retrieve) */)
1219 {
1220     SCROLLBAR_INFO *infoPtr;
1221
1222     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1223     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return FALSE;
1224     if ((info->cbSize != sizeof(*info)) &&
1225         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return FALSE;
1226
1227     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->Page;
1228     if (info->fMask & SIF_POS) info->nPos = infoPtr->CurVal;
1229     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1230         info->nTrackPos = (SCROLL_TrackingWin==hwnd) ? SCROLL_TrackingVal : 0;
1231     if (info->fMask & SIF_RANGE)
1232     {
1233         info->nMin = infoPtr->MinVal;
1234         info->nMax = infoPtr->MaxVal;
1235     }
1236     return (info->fMask & SIF_ALL) != 0;
1237 }
1238
1239
1240 /*************************************************************************
1241  *           SetScrollPos16   (USER.62)
1242  */
1243 INT16 WINAPI SetScrollPos16( HWND16 hwnd, INT16 nBar, INT16 nPos,
1244                              BOOL16 bRedraw )
1245 {
1246     return (INT16)SetScrollPos( hwnd, nBar, nPos, bRedraw );
1247 }
1248
1249
1250 /*************************************************************************
1251  *           SetScrollPos32   (USER32.502)
1252  *
1253  * RETURNS
1254  *    Success: Scrollbar position
1255  *    Failure: 0
1256  *
1257  * REMARKS
1258  *    Note the ambiguity when 0 is returned.  Use GetLastError
1259  *    to make sure there was an error (and to know which one).
1260  */
1261 INT WINAPI SetScrollPos(
1262 HWND hwnd /* [I] Handle of window whose scrollbar will be affected */,
1263 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1264 INT nPos /* [I] New value */,
1265 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */ )
1266 {
1267     SCROLLINFO info;
1268     SCROLLBAR_INFO *infoPtr;
1269     INT oldPos;
1270
1271     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1272     oldPos      = infoPtr->CurVal;
1273     info.cbSize = sizeof(info);
1274     info.nPos   = nPos;
1275     info.fMask  = SIF_POS;
1276     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1277     return oldPos;
1278 }
1279
1280
1281 /*************************************************************************
1282  *           GetScrollPos16   (USER.63)
1283  */
1284 INT16 WINAPI GetScrollPos16( HWND16 hwnd, INT16 nBar )
1285 {
1286     return (INT16)GetScrollPos( hwnd, nBar );
1287 }
1288
1289
1290 /*************************************************************************
1291  *           GetScrollPos32   (USER32.285)
1292  *
1293  * RETURNS
1294  *    Success: Current position
1295  *    Failure: 0
1296  *
1297  * REMARKS
1298  *    Note the ambiguity when 0 is returned.  Use GetLastError
1299  *    to make sure there was an error (and to know which one).
1300  */
1301 INT WINAPI GetScrollPos(
1302 HWND hwnd, /* [I] Handle of window */
1303 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */)
1304 {
1305     SCROLLBAR_INFO *infoPtr;
1306
1307     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1308     return infoPtr->CurVal;
1309 }
1310
1311
1312 /*************************************************************************
1313  *           SetScrollRange16   (USER.64)
1314  */
1315 void WINAPI SetScrollRange16( HWND16 hwnd, INT16 nBar,
1316                               INT16 MinVal, INT16 MaxVal, BOOL16 bRedraw )
1317 {
1318     /* Invalid range -> range is set to (0,0) */
1319     if ((INT)MaxVal - (INT)MinVal > 0x7fff) MinVal = MaxVal = 0;
1320     SetScrollRange( hwnd, nBar, MinVal, MaxVal, bRedraw );
1321 }
1322
1323
1324 /*************************************************************************
1325  *           SetScrollRange32   (USER32.503)
1326  *
1327  * RETURNS STD
1328  */
1329 BOOL WINAPI SetScrollRange(
1330 HWND hwnd, /* [I] Handle of window whose scrollbar will be affected */
1331 INT nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */
1332 INT MinVal, /* [I] New minimum value */
1333 INT MaxVal, /* [I] New maximum value */
1334 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
1335 {
1336     SCROLLINFO info;
1337
1338     info.cbSize = sizeof(info);
1339     info.nMin   = MinVal;
1340     info.nMax   = MaxVal;
1341     info.fMask  = SIF_RANGE;
1342     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1343     return TRUE;
1344 }
1345
1346
1347 /*************************************************************************
1348  *           SCROLL_SetNCSbState
1349  *
1350  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1351  */
1352 INT SCROLL_SetNCSbState(WND* wndPtr, int vMin, int vMax, int vPos,
1353                                        int hMin, int hMax, int hPos)
1354 {
1355     INT vA, hA;
1356     SCROLLINFO vInfo, hInfo;
1357
1358     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1359     vInfo.nMin   = vMin;         hInfo.nMin   = hMin;
1360     vInfo.nMax   = vMax;         hInfo.nMax   = hMax;
1361     vInfo.nPos   = vPos;         hInfo.nPos   = hPos;
1362     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1363
1364     SCROLL_SetScrollInfo( wndPtr->hwndSelf, SB_VERT, &vInfo, &vA );
1365     SCROLL_SetScrollInfo( wndPtr->hwndSelf, SB_HORZ, &hInfo, &hA );
1366
1367     if( !SCROLL_ShowScrollBar( wndPtr->hwndSelf, SB_BOTH,
1368                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1369     {
1370         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1371         if( vA & SA_SSI_REFRESH )
1372             SCROLL_RefreshScrollBar( wndPtr->hwndSelf, SB_VERT, FALSE, TRUE );
1373
1374         if( hA & SA_SSI_REFRESH )
1375             SCROLL_RefreshScrollBar( wndPtr->hwndSelf, SB_HORZ, FALSE, TRUE );
1376     }
1377     return 0;
1378 }
1379
1380
1381 /*************************************************************************
1382  *           GetScrollRange16   (USER.65)
1383  */
1384 BOOL16 WINAPI GetScrollRange16( HWND16 hwnd, INT16 nBar,
1385                                 LPINT16 lpMin, LPINT16 lpMax)
1386 {
1387     INT min, max;
1388     BOOL16 ret = GetScrollRange( hwnd, nBar, &min, &max );
1389     if (lpMin) *lpMin = min;
1390     if (lpMax) *lpMax = max;
1391     return ret;
1392 }
1393
1394
1395 /*************************************************************************
1396  *           GetScrollRange32   (USER32.286)
1397  *
1398  * RETURNS STD
1399  */
1400 BOOL WINAPI GetScrollRange(
1401 HWND hwnd, /* [I] Handle of window */
1402 INT nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL  */
1403 LPINT lpMin, /* [O] Where to store minimum value */
1404 LPINT lpMax /* [O] Where to store maximum value */)
1405 {
1406     SCROLLBAR_INFO *infoPtr;
1407
1408     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar )))
1409     {
1410         if (lpMin) lpMin = 0;
1411         if (lpMax) lpMax = 0;
1412         return FALSE;
1413     }
1414     if (lpMin) *lpMin = infoPtr->MinVal;
1415     if (lpMax) *lpMax = infoPtr->MaxVal;
1416     return TRUE;
1417 }
1418
1419
1420 /*************************************************************************
1421  *           SCROLL_ShowScrollBar()
1422  *
1423  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1424  * NOTE: fShowV/fShowH must be zero when nBar is SB_HORZ/SB_VERT.
1425  */
1426 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1427                              BOOL fShowH, BOOL fShowV )
1428 {
1429     WND *wndPtr = WIN_FindWndPtr( hwnd );
1430     BOOL retvalue = FALSE;
1431
1432     if (!wndPtr) return FALSE;
1433     TRACE("hwnd=%04x bar=%d horz=%d, vert=%d\n",
1434                     hwnd, nBar, fShowH, fShowV );
1435
1436     switch(nBar)
1437     {
1438     case SB_CTL:
1439         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1440         retvalue = TRUE;
1441         goto END;
1442
1443     case SB_BOTH:
1444     case SB_HORZ:
1445         if (fShowH)
1446         {
1447             fShowH = !(wndPtr->dwStyle & WS_HSCROLL);
1448             wndPtr->dwStyle |= WS_HSCROLL;
1449         }
1450         else  /* hide it */
1451         {
1452             fShowH = (wndPtr->dwStyle & WS_HSCROLL);
1453             wndPtr->dwStyle &= ~WS_HSCROLL;
1454         }
1455         if( nBar == SB_HORZ ) break;
1456         /* fall through */
1457
1458     case SB_VERT:
1459         if (fShowV)
1460         {
1461             fShowV = !(wndPtr->dwStyle & WS_VSCROLL);
1462             wndPtr->dwStyle |= WS_VSCROLL;
1463         }
1464         else  /* hide it */
1465         {
1466             fShowV = (wndPtr->dwStyle & WS_VSCROLL);
1467             wndPtr->dwStyle &= ~WS_VSCROLL;
1468         }
1469         break;
1470
1471     default:
1472         retvalue = FALSE;  /* Nothing to do! */
1473         goto END;
1474     }
1475
1476     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1477     {
1478         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1479                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1480         retvalue = TRUE;
1481         goto END;
1482     }
1483
1484     retvalue = FALSE; /* no frame changes */
1485 END:
1486     WIN_ReleaseWndPtr(wndPtr);
1487     return retvalue;
1488 }
1489
1490
1491 /*************************************************************************
1492  *           ShowScrollBar16   (USER.267)
1493  */
1494 void WINAPI ShowScrollBar16( HWND16 hwnd, INT16 nBar, BOOL16 fShow )
1495 {
1496     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1497                                       (nBar == SB_HORZ) ? 0 : fShow );
1498 }
1499
1500
1501 /*************************************************************************
1502  *           ShowScrollBar32   (USER32.532)
1503  *
1504  * RETURNS STD
1505  */
1506 BOOL WINAPI ShowScrollBar(
1507 HWND hwnd, /* [I] Handle of window whose scrollbar(s) will be affected   */
1508 INT nBar, /* [I] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1509 BOOL fShow /* [I] TRUE = show, FALSE = hide  */)
1510 {
1511     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1512                                       (nBar == SB_HORZ) ? 0 : fShow );
1513     return TRUE;
1514 }
1515
1516
1517 /*************************************************************************
1518  *           EnableScrollBar16   (USER.482)
1519  */
1520 BOOL16 WINAPI EnableScrollBar16( HWND16 hwnd, INT16 nBar, UINT16 flags )
1521 {
1522     return EnableScrollBar( hwnd, nBar, flags );
1523 }
1524
1525
1526 /*************************************************************************
1527  *           EnableScrollBar32   (USER32.171)
1528  */
1529 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1530 {
1531     BOOL bFineWithMe;
1532     SCROLLBAR_INFO *infoPtr;
1533
1534     TRACE("%04x %d %d\n", hwnd, nBar, flags );
1535
1536     flags &= ESB_DISABLE_BOTH;
1537
1538     if (nBar == SB_BOTH)
1539     {
1540         if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, SB_VERT ))) return FALSE;
1541         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1542         {
1543             infoPtr->flags = flags;
1544             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1545         }
1546         nBar = SB_HORZ;
1547     }
1548     else
1549         bFineWithMe = TRUE;
1550
1551     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1552     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1553     infoPtr->flags = flags;
1554
1555     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1556     return TRUE;
1557 }