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 "message.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, *LPSCROLLBAR_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  *           SCROLL_ScrollInfoValid
 142  *
 143  *  Determine if the supplied SCROLLINFO struct is valid.
 144  */
 145 inline static BOOL SCROLL_ScrollInfoValid(
 146 LPSCROLLINFO info /* [in] The SCROLLINFO struct to be tested */)
 147 {
 148     return !(info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)
 149         || (info->cbSize != sizeof(*info)
 150             && info->cbSize != sizeof(*info) - sizeof(info->nTrackPos)));
 151 }
 152
 153
 154 /***********************************************************************
 155  *           SCROLL_LoadBitmaps
 156  */
 157 static void SCROLL_LoadBitmaps(void)
 158 {
 159     hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
 160     hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
 161     hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
 162     hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
 163     hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
 164     hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
 165     hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
 166     hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
 167     hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
 168     hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
 169     hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
 170     hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
 171 }
 172
 173
 174 /***********************************************************************
 175  *           SCROLL_GetScrollBarInfo
 176  */
 177 static SCROLLBAR_INFO *SCROLL_GetScrollBarInfo( HWND hwnd, INT nBar )
 178 {
 179     SCROLLBAR_INFO *infoPtr;
 180     WND *wndPtr = WIN_FindWndPtr( hwnd );
 181
 182     if (!wndPtr) return NULL;
 183     switch(nBar)
 184     {
 185         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 186         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 187         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 188         default:
 189             WIN_ReleaseWndPtr( wndPtr );
 190             return NULL;
 191     }
 192
 193     if (!infoPtr)  /* Create the info structure if needed */
 194     {
 195         if ((infoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(SCROLLBAR_INFO) )))
 196         {
 197             infoPtr->minVal = infoPtr->curVal = infoPtr->page = 0;
 198             infoPtr->maxVal = 100;
 199             infoPtr->flags  = ESB_ENABLE_BOTH;
 200             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 201             else wndPtr->pVScroll = infoPtr;
 202         }
 203         if (!hUpArrow) SCROLL_LoadBitmaps();
 204     }
 205     WIN_ReleaseWndPtr( wndPtr );
 206     return infoPtr;
 207 }
 208
 209
 210 /***********************************************************************
 211  *           SCROLL_GetScrollBarRect
 212  *
 213  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 214  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 215  * 'arrowSize' returns the width or height of an arrow (depending on
 216  * the orientation of the scrollbar), 'thumbSize' returns the size of
 217  * the thumb, and 'thumbPos' returns the position of the thumb
 218  * relative to the left or to the top.
 219  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 220  */
 221 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 222                                        INT *arrowSize, INT *thumbSize,
 223                                        INT *thumbPos )
 224 {
 225     INT pixels;
 226     BOOL vertical;
 227     WND *wndPtr = WIN_FindWndPtr( hwnd );
 228
 229     switch(nBar)
 230     {
 231       case SB_HORZ:
 232         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 233         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 234         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 235         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 236         if(wndPtr->dwStyle & WS_BORDER) {
 237           lprect->left--;
 238           lprect->right++;
 239         } else if(wndPtr->dwStyle & WS_VSCROLL)
 240           lprect->right++;
 241         vertical = FALSE;
 242         break;
 243
 244       case SB_VERT:
 245         if((wndPtr->dwExStyle & WS_EX_LEFTSCROLLBAR) != 0)
 246             lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - GetSystemMetrics(SM_CXVSCROLL);
 247         else
 248             lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 249         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 250         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 251         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 252         if(wndPtr->dwStyle & WS_BORDER) {
 253           lprect->top--;
 254           lprect->bottom++;
 255         } else if(wndPtr->dwStyle & WS_HSCROLL)
 256           lprect->bottom++;
 257         vertical = TRUE;
 258         break;
 259
 260       case SB_CTL:
 261         GetClientRect( hwnd, lprect );
 262         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 263         break;
 264
 265     default:
 266         WIN_ReleaseWndPtr(wndPtr);
 267         return FALSE;
 268     }
 269
 270     if (vertical) pixels = lprect->bottom - lprect->top;
 271     else pixels = lprect->right - lprect->left;
 272
 273     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 274     {
 275         if (pixels > SCROLL_MIN_RECT)
 276             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 277         else
 278             *arrowSize = 0;
 279         *thumbPos = *thumbSize = 0;
 280     }
 281     else
 282     {
 283         SCROLLBAR_INFO *info = SCROLL_GetScrollBarInfo( hwnd, nBar );
 284
 285         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 286         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 287
 288         if (info->page)
 289         {
 290             *thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
 291             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 292         }
 293         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 294
 295         if (((pixels -= *thumbSize ) < 0) ||
 296             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 297         {
 298             /* Rectangle too small or scrollbar disabled -> no thumb */
 299             *thumbPos = *thumbSize = 0;
 300         }
 301         else
 302         {
 303             INT max = info->maxVal - max( info->page-1, 0 );
 304             if (info->minVal >= max)
 305                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 306             else
 307                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 308                   + MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
 309         }
 310     }
 311     WIN_ReleaseWndPtr(wndPtr);
 312     return vertical;
 313 }
 314
 315
 316 /***********************************************************************
 317  *           SCROLL_GetThumbVal
 318  *
 319  * Compute the current scroll position based on the thumb position in pixels
 320  * from the top of the scroll-bar.
 321  */
 322 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 323                                   BOOL vertical, INT pos )
 324 {
 325     INT thumbSize;
 326     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 327
 328     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 329         return infoPtr->minVal;
 330
 331     if (infoPtr->page)
 332     {
 333         thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
 334         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 335     }
 336     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 337
 338     if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
 339
 340     pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 341     if (pos > pixels) pos = pixels;
 342
 343     if (!infoPtr->page) pos *= infoPtr->maxVal - infoPtr->minVal;
 344     else pos *= infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
 345     return infoPtr->minVal + ((pos + pixels / 2) / pixels);
 346 }
 347
 348 /***********************************************************************
 349  *           SCROLL_PtInRectEx
 350  */
 351 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 352 {
 353     RECT rect = *lpRect;
 354
 355     if (vertical)
 356     {
 357         rect.left -= lpRect->right - lpRect->left;
 358         rect.right += lpRect->right - lpRect->left;
 359     }
 360     else
 361     {
 362         rect.top -= lpRect->bottom - lpRect->top;
 363         rect.bottom += lpRect->bottom - lpRect->top;
 364     }
 365     return PtInRect( &rect, pt );
 366 }
 367
 368 /***********************************************************************
 369  *           SCROLL_ClipPos
 370  */
 371 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 372 {
 373     if( pt.x < lpRect->left )
 374         pt.x = lpRect->left;
 375     else
 376     if( pt.x > lpRect->right )
 377         pt.x = lpRect->right;
 378
 379     if( pt.y < lpRect->top )
 380         pt.y = lpRect->top;
 381     else
 382     if( pt.y > lpRect->bottom )
 383         pt.y = lpRect->bottom;
 384
 385     return pt;
 386 }
 387
 388
 389 /***********************************************************************
 390  *           SCROLL_HitTest
 391  *
 392  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 393  */
 394 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 395                                            POINT pt, BOOL bDragging )
 396 {
 397     INT arrowSize, thumbSize, thumbPos;
 398     RECT rect;
 399
 400     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 401                                            &arrowSize, &thumbSize, &thumbPos );
 402
 403     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 404          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 405
 406     if (vertical)
 407     {
 408         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 409         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 410         if (!thumbPos) return SCROLL_TOP_RECT;
 411         pt.y -= rect.top;
 412         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 413         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 414     }
 415     else  /* horizontal */
 416     {
 417         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 418         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 419         if (!thumbPos) return SCROLL_TOP_RECT;
 420         pt.x -= rect.left;
 421         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 422         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 423     }
 424     return SCROLL_THUMB;
 425 }
 426
 427
 428 /***********************************************************************
 429  *           SCROLL_DrawArrows
 430  *
 431  * Draw the scroll bar arrows.
 432  */
 433 static void SCROLL_DrawArrows_9x( HDC hdc, SCROLLBAR_INFO *infoPtr,
 434                                   RECT *rect, INT arrowSize, BOOL vertical,
 435                                   BOOL top_pressed, BOOL bottom_pressed )
 436 {
 437   RECT r;
 438
 439   r = *rect;
 440   if( vertical )
 441     r.bottom = r.top + arrowSize;
 442   else
 443     r.right = r.left + arrowSize;
 444
 445   DrawFrameControl( hdc, &r, DFC_SCROLL,
 446                     (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
 447                     | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 448                     | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );
 449
 450   r = *rect;
 451   if( vertical )
 452     r.top = r.bottom-arrowSize;
 453   else
 454     r.left = r.right-arrowSize;
 455
 456   DrawFrameControl( hdc, &r, DFC_SCROLL,
 457                     (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
 458                     | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 459                     | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
 460 }
 461
 462 static void SCROLL_DrawArrows_31( HDC hdc, SCROLLBAR_INFO *infoPtr,
 463                                   RECT *rect, INT arrowSize, BOOL vertical,
 464                                   BOOL top_pressed, BOOL bottom_pressed )
 465 {
 466     HDC hdcMem = CreateCompatibleDC( hdc );
 467     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 468                                     TOP_ARROW(infoPtr->flags, top_pressed)
 469                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 470
 471     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 472     StretchBlt( hdc, rect->left, rect->top,
 473                   vertical ? rect->right-rect->left : arrowSize,
 474                   vertical ? arrowSize : rect->bottom-rect->top,
 475                   hdcMem, 0, 0,
 476                   GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 477                   SRCCOPY );
 478
 479     SelectObject( hdcMem, vertical ?
 480                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 481                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 482     if (vertical)
 483         StretchBlt( hdc, rect->left, rect->bottom - arrowSize,
 484                       rect->right - rect->left, arrowSize,
 485                       hdcMem, 0, 0,
 486                       GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 487                       SRCCOPY );
 488     else
 489         StretchBlt( hdc, rect->right - arrowSize, rect->top,
 490                       arrowSize, rect->bottom - rect->top,
 491                       hdcMem, 0, 0,
 492                       GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
 493                       SRCCOPY );
 494     SelectObject( hdcMem, hbmpPrev );
 495     DeleteDC( hdcMem );
 496 }
 497
 498 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 499                                RECT *rect, INT arrowSize, BOOL vertical,
 500                                BOOL top_pressed, BOOL bottom_pressed )
 501 {
 502   if( TWEAK_WineLook == WIN31_LOOK )
 503     SCROLL_DrawArrows_31( hdc, infoPtr, rect, arrowSize,
 504                           vertical, top_pressed,bottom_pressed );
 505   else
 506     SCROLL_DrawArrows_9x( hdc, infoPtr, rect, arrowSize,
 507                           vertical, top_pressed,bottom_pressed );
 508 }
 509
 510
 511 /***********************************************************************
 512  *           SCROLL_DrawMovingThumb
 513  *
 514  * Draw the moving thumb rectangle.
 515  */
 516 static void SCROLL_DrawMovingThumb_31( HDC hdc, RECT *rect, BOOL vertical,
 517                                        INT arrowSize, INT thumbSize )
 518 {
 519     RECT r = *rect;
 520     if (vertical)
 521     {
 522         r.top += SCROLL_TrackingPos;
 523         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 524             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 525         if (r.top + thumbSize >
 526                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 527             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 528                                                                   - thumbSize;
 529         r.bottom = r.top + thumbSize;
 530     }
 531     else
 532     {
 533         r.left += SCROLL_TrackingPos;
 534         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 535             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 536         if (r.left + thumbSize >
 537                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 538             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 539                                                                   - thumbSize;
 540         r.right = r.left + thumbSize;
 541     }
 542
 543     DrawFocusRect( hdc, &r );
 544     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 545 }
 546
 547 static void SCROLL_DrawMovingThumb_9x( HDC hdc, RECT *rect, BOOL vertical,
 548                                        INT arrowSize, INT thumbSize )
 549 {
 550   INT pos = SCROLL_TrackingPos;
 551   INT max_size;
 552
 553   if( vertical )
 554     max_size = rect->bottom - rect->top;
 555   else
 556     max_size = rect->right - rect->left;
 557
 558   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 559
 560   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 561     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 562   else if( pos > max_size )
 563     pos = max_size;
 564
 565   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 566                           rect, arrowSize, thumbSize, pos,
 567                           0, vertical, FALSE, FALSE );
 568
 569   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 570 }
 571
 572 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 573                                     INT arrowSize, INT thumbSize )
 574 {
 575   if( TWEAK_WineLook == WIN31_LOOK )
 576     SCROLL_DrawMovingThumb_31( hdc, rect, vertical, arrowSize, thumbSize );
 577   else
 578     SCROLL_DrawMovingThumb_9x( hdc, rect, vertical, arrowSize, thumbSize );
 579 }
 580
 581 /***********************************************************************
 582  *           SCROLL_DrawInterior
 583  *
 584  * Draw the scroll bar interior (everything except the arrows).
 585  */
 586 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 587                                     RECT *rect, INT arrowSize,
 588                                     INT thumbSize, INT thumbPos,
 589                                     UINT flags, BOOL vertical,
 590                                     BOOL top_selected, BOOL bottom_selected )
 591 {
 592     RECT r;
 593     HPEN hSavePen;
 594     HBRUSH hSaveBrush,hBrush;
 595
 596     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 597      * The window-owned scrollbars need to call DEFWND_ControlColor
 598      * to correctly setup default scrollbar colors
 599      */
 600     if (nBar == SB_CTL)
 601     {
 602       hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 603                                      (WPARAM)hdc,(LPARAM)hwnd);
 604     }
 605     else
 606     {
 607       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 608     }
 609
 610     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 611     hSaveBrush = SelectObject( hdc, hBrush );
 612
 613     /* Calculate the scroll rectangle */
 614     r = *rect;
 615     if (vertical)
 616     {
 617         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 618         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 619     }
 620     else
 621     {
 622         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 623         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 624     }
 625
 626     /* Draw the scroll rectangles and thumb */
 627     if (!thumbPos)  /* No thumb to draw */
 628     {
 629         PatBlt( hdc, r.left, r.top,
 630                      r.right - r.left, r.bottom - r.top,
 631                      PATCOPY );
 632
 633         /* cleanup and return */
 634         SelectObject( hdc, hSavePen );
 635         SelectObject( hdc, hSaveBrush );
 636         return;
 637     }
 638
 639     if (vertical)
 640     {
 641         PatBlt( hdc, r.left, r.top,
 642                   r.right - r.left,
 643                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 644                   top_selected ? 0x0f0000 : PATCOPY );
 645         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 646         PatBlt( hdc, r.left, r.top + thumbSize,
 647                   r.right - r.left,
 648                   r.bottom - r.top - thumbSize,
 649                   bottom_selected ? 0x0f0000 : PATCOPY );
 650         r.bottom = r.top + thumbSize;
 651     }
 652     else  /* horizontal */
 653     {
 654         PatBlt( hdc, r.left, r.top,
 655                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 656                   r.bottom - r.top,
 657                   top_selected ? 0x0f0000 : PATCOPY );
 658         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 659         PatBlt( hdc, r.left + thumbSize, r.top,
 660                   r.right - r.left - thumbSize,
 661                   r.bottom - r.top,
 662                   bottom_selected ? 0x0f0000 : PATCOPY );
 663         r.right = r.left + thumbSize;
 664     }
 665
 666     /* Draw the thumb */
 667     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 668
 669     /* cleanup */
 670     SelectObject( hdc, hSavePen );
 671     SelectObject( hdc, hSaveBrush );
 672 }
 673
 674
 675 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 676                                  RECT *rect, INT arrowSize,
 677                                  INT thumbSize, INT thumbPos,
 678                                  UINT flags, BOOL vertical,
 679                                  BOOL top_selected, BOOL bottom_selected )
 680 {
 681     RECT r;
 682     HPEN hSavePen;
 683     HBRUSH hSaveBrush,hBrush;
 684     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 685
 686     if (Save_SCROLL_MovingThumb &&
 687         (SCROLL_TrackingWin == hwnd) &&
 688         (SCROLL_TrackingBar == nBar))
 689         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 690
 691       /* Select the correct brush and pen */
 692
 693     if (TWEAK_WineLook == WIN31_LOOK && (flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 694     {
 695         /* This ought to be the color of the parent window */
 696         hBrush = GetSysColorBrush(COLOR_WINDOW);
 697     }
 698     else
 699     {
 700         /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 701          * The window-owned scrollbars need to call DEFWND_ControlColor
 702          * to correctly setup default scrollbar colors
 703          */
 704         if (nBar == SB_CTL) {
 705             hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 706                                            (WPARAM)hdc,(LPARAM)hwnd);
 707         } else {
 708             hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 709         }
 710     }
 711     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 712     hSaveBrush = SelectObject( hdc, hBrush );
 713
 714       /* Calculate the scroll rectangle */
 715
 716     r = *rect;
 717     if (vertical)
 718     {
 719         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 720         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 721     }
 722     else
 723     {
 724         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 725         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 726     }
 727
 728       /* Draw the scroll bar frame */
 729
 730         /* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
 731     if (TWEAK_WineLook == WIN31_LOOK)
 732         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 733
 734       /* Draw the scroll rectangles and thumb */
 735
 736     if (!thumbPos)  /* No thumb to draw */
 737     {
 738         INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 0 : 1;
 739
 740         PatBlt( hdc, r.left+offset, r.top+offset,
 741                      r.right - r.left - 2*offset, r.bottom - r.top - 2*offset,
 742                      PATCOPY );
 743
 744         /* cleanup and return */
 745         SelectObject( hdc, hSavePen );
 746         SelectObject( hdc, hSaveBrush );
 747         return;
 748     }
 749
 750     if (vertical)
 751     {
 752         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 753
 754         PatBlt( hdc, r.left + offset, r.top + offset,
 755                   r.right - r.left - offset*2,
 756                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - offset,
 757                   top_selected ? 0x0f0000 : PATCOPY );
 758         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 759         PatBlt( hdc, r.left + offset, r.top + thumbSize,
 760                   r.right - r.left - offset*2,
 761                   r.bottom - r.top - thumbSize - offset,
 762                   bottom_selected ? 0x0f0000 : PATCOPY );
 763         r.bottom = r.top + thumbSize;
 764     }
 765     else  /* horizontal */
 766     {
 767         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 768
 769         PatBlt( hdc, r.left + offset, r.top + offset,
 770                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 771                   r.bottom - r.top - offset*2,
 772                   top_selected ? 0x0f0000 : PATCOPY );
 773         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 774         PatBlt( hdc, r.left + thumbSize, r.top + offset,
 775                   r.right - r.left - thumbSize - offset,
 776                   r.bottom - r.top - offset*2,
 777                   bottom_selected ? 0x0f0000 : PATCOPY );
 778         r.right = r.left + thumbSize;
 779     }
 780
 781       /* Draw the thumb */
 782
 783     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 784     if (TWEAK_WineLook == WIN31_LOOK)
 785     {
 786         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 787         r.top++, r.left++;
 788     }
 789     else
 790     {
 791         Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 792     }
 793     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 794
 795     if (Save_SCROLL_MovingThumb &&
 796         (SCROLL_TrackingWin == hwnd) &&
 797         (SCROLL_TrackingBar == nBar))
 798         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 799
 800     /* cleanup */
 801     SelectObject( hdc, hSavePen );
 802     SelectObject( hdc, hSaveBrush );
 803 }
 804
 805
 806 /***********************************************************************
 807  *           SCROLL_DrawScrollBar
 808  *
 809  * Redraw the whole scrollbar.
 810  */
 811 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 812                            BOOL arrows, BOOL interior )
 813 {
 814     INT arrowSize, thumbSize, thumbPos;
 815     RECT rect;
 816     BOOL vertical;
 817     WND *wndPtr = WIN_FindWndPtr( hwnd );
 818     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 819     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 820
 821     if (!wndPtr || !infoPtr ||
 822         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 823         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 824     if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
 825     hwnd = wndPtr->hwndSelf;  /* make it a full handle */
 826
 827     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 828                                         &arrowSize, &thumbSize, &thumbPos );
 829
 830     /* do not draw if the scrollbar rectangle is empty */
 831     if(IsRectEmpty(&rect))
 832       goto END;
 833
 834     if (Save_SCROLL_MovingThumb &&
 835         (SCROLL_TrackingWin == hwnd) &&
 836         (SCROLL_TrackingBar == nBar))
 837         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 838
 839       /* Draw the arrows */
 840
 841     if (arrows && arrowSize)
 842     {
 843         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 844             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 845                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 846                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 847         else
 848             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 849                                                                FALSE, FALSE );
 850     }
 851     if( interior )
 852         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 853                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 854
 855     if (Save_SCROLL_MovingThumb &&
 856         (SCROLL_TrackingWin == hwnd) &&
 857         (SCROLL_TrackingBar == nBar))
 858         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 859
 860     /* if scroll bar has focus, reposition the caret */
 861     if(hwnd==GetFocus() && (nBar==SB_CTL))
 862     {
 863         if (!vertical)
 864         {
 865             SetCaretPos(thumbPos+1, rect.top+1);
 866         }
 867         else
 868         {
 869             SetCaretPos(rect.top+1, thumbPos+1);
 870         }
 871     }
 872
 873 END:
 874     WIN_ReleaseWndPtr(wndPtr);
 875 }
 876
 877
 878 /***********************************************************************
 879  *           SCROLL_RefreshScrollBar
 880  *
 881  * Repaint the scroll bar interior after a SetScrollRange() or
 882  * SetScrollPos() call.
 883  */
 884 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 885                                      BOOL arrows, BOOL interior )
 886 {
 887     HDC hdc = GetDCEx( hwnd, 0,
 888                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 889     if (!hdc) return;
 890
 891     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 892     ReleaseDC( hwnd, hdc );
 893 }
 894
 895
 896 /***********************************************************************
 897  *           SCROLL_HandleKbdEvent
 898  *
 899  * Handle a keyboard event (only for SB_CTL scrollbars with focus).
 900  */
 901 static void SCROLL_HandleKbdEvent(
 902 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
 903 WPARAM wParam /* [in] Variable input including enable state */,
 904 LPARAM lParam /* [in] Variable input including input point */)
 905 {
 906     TRACE("hwnd=%p wParam=%d lParam=%ld\n", hwnd, wParam, lParam);
 907
 908     /* hide caret on first KEYDOWN to prevent flicker */
 909     if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
 910         HideCaret(hwnd);
 911
 912     switch(wParam)
 913     {
 914     case VK_PRIOR: wParam = SB_PAGEUP; break;
 915     case VK_NEXT:  wParam = SB_PAGEDOWN; break;
 916     case VK_HOME:  wParam = SB_TOP; break;
 917     case VK_END:   wParam = SB_BOTTOM; break;
 918     case VK_UP:    wParam = SB_LINEUP; break;
 919     case VK_DOWN:  wParam = SB_LINEDOWN; break;
 920     default: return;
 921     }
 922     SendMessageW(GetParent(hwnd),
 923         ((GetWindowLongA( hwnd, GWL_STYLE ) & SBS_VERT) ?
 924             WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
 925 }
 926
 927
 928 /***********************************************************************
 929  *           SCROLL_HandleScrollEvent
 930  *
 931  * Handle a mouse or timer event for the scrollbar.
 932  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 933  * windows coordinates.
 934  */
 935 static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 936 {
 937       /* Previous mouse position for timer events */
 938     static POINT prevPt;
 939       /* Thumb position when tracking started. */
 940     static UINT trackThumbPos;
 941       /* Position in the scroll-bar of the last button-down event. */
 942     static INT lastClickPos;
 943       /* Position in the scroll-bar of the last mouse event. */
 944     static INT lastMousePos;
 945
 946     enum SCROLL_HITTEST hittest;
 947     HWND hwndOwner, hwndCtl;
 948     BOOL vertical;
 949     INT arrowSize, thumbSize, thumbPos;
 950     RECT rect;
 951     HDC hdc;
 952
 953     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 954     if (!infoPtr) return;
 955     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 956                   return;
 957
 958     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 959     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 960                                         &arrowSize, &thumbSize, &thumbPos );
 961     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 962     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 963
 964     switch(msg)
 965     {
 966       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 967           HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 968           SCROLL_trackVertical = vertical;
 969           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 970           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 971           lastMousePos  = lastClickPos;
 972           trackThumbPos = thumbPos;
 973           prevPt = pt;
 974           if (nBar == SB_CTL && (GetWindowLongA(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
 975           SetCapture( hwnd );
 976           break;
 977
 978       case WM_MOUSEMOVE:
 979           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 980           prevPt = pt;
 981           break;
 982
 983       case WM_LBUTTONUP:
 984           hittest = SCROLL_NOWHERE;
 985           ReleaseCapture();
 986           /* if scrollbar has focus, show back caret */
 987           if (hwnd==GetFocus()) ShowCaret(hwnd);
 988           break;
 989
 990       case WM_SYSTIMER:
 991           pt = prevPt;
 992           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 993           break;
 994
 995       default:
 996           return;  /* Should never happen */
 997     }
 998
 999     TRACE("Event: hwnd=%p bar=%d msg=%s pt=%ld,%ld hit=%d\n",
1000           hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
1001
1002     switch(SCROLL_trackHitTest)
1003     {
1004     case SCROLL_NOWHERE:  /* No tracking in progress */
1005         break;
1006
1007     case SCROLL_TOP_ARROW:
1008         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1009                            (hittest == SCROLL_trackHitTest), FALSE );
1010         if (hittest == SCROLL_trackHitTest)
1011         {
1012             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1013             {
1014                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1015                                 SB_LINEUP, (LPARAM)hwndCtl );
1016             }
1017
1018             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1019                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1020                             (TIMERPROC)0 );
1021         }
1022         else KillSystemTimer( hwnd, SCROLL_TIMER );
1023         break;
1024
1025     case SCROLL_TOP_RECT:
1026         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1027                              thumbPos, infoPtr->flags, vertical,
1028                              (hittest == SCROLL_trackHitTest), FALSE );
1029         if (hittest == SCROLL_trackHitTest)
1030         {
1031             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1032             {
1033                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1034                                 SB_PAGEUP, (LPARAM)hwndCtl );
1035             }
1036             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1037                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1038                               (TIMERPROC)0 );
1039         }
1040         else KillSystemTimer( hwnd, SCROLL_TIMER );
1041         break;
1042
1043     case SCROLL_THUMB:
1044         if (msg == WM_LBUTTONDOWN)
1045         {
1046             SCROLL_TrackingWin = hwnd;
1047             SCROLL_TrackingBar = nBar;
1048             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
1049             SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1050                                                         vertical,
1051                                                         SCROLL_TrackingPos );
1052             if (!SCROLL_MovingThumb)
1053                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1054         }
1055         else if (msg == WM_LBUTTONUP)
1056         {
1057             if (SCROLL_MovingThumb)
1058                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1059             SCROLL_TrackingWin = 0;
1060             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1061                                  thumbPos, infoPtr->flags, vertical,
1062                                  FALSE, FALSE );
1063         }
1064         else  /* WM_MOUSEMOVE */
1065         {
1066             UINT pos;
1067
1068             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
1069             else
1070             {
1071                 pt = SCROLL_ClipPos( &rect, pt );
1072                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
1073             }
1074             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
1075             {
1076                 if (SCROLL_MovingThumb)
1077                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1078                                         arrowSize, thumbSize );
1079                 lastMousePos = pos;
1080                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
1081                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1082                                                          vertical,
1083                                                          SCROLL_TrackingPos );
1084                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1085                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
1086                                 (LPARAM)hwndCtl );
1087                 if (!SCROLL_MovingThumb)
1088                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1089                                         arrowSize, thumbSize );
1090             }
1091         }
1092         break;
1093
1094     case SCROLL_BOTTOM_RECT:
1095         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1096                              thumbPos, infoPtr->flags, vertical,
1097                              FALSE, (hittest == SCROLL_trackHitTest) );
1098         if (hittest == SCROLL_trackHitTest)
1099         {
1100             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1101             {
1102                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1103                                 SB_PAGEDOWN, (LPARAM)hwndCtl );
1104             }
1105             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1106                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1107                               (TIMERPROC)0 );
1108         }
1109         else KillSystemTimer( hwnd, SCROLL_TIMER );
1110         break;
1111
1112     case SCROLL_BOTTOM_ARROW:
1113         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1114                            FALSE, (hittest == SCROLL_trackHitTest) );
1115         if (hittest == SCROLL_trackHitTest)
1116         {
1117             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1118             {
1119                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1120                                 SB_LINEDOWN, (LPARAM)hwndCtl );
1121             }
1122
1123             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1124                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1125                             (TIMERPROC)0 );
1126         }
1127         else KillSystemTimer( hwnd, SCROLL_TIMER );
1128         break;
1129     }
1130
1131     if (msg == WM_LBUTTONDOWN)
1132     {
1133
1134         if (hittest == SCROLL_THUMB)
1135         {
1136             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1137                                  trackThumbPos + lastMousePos - lastClickPos );
1138             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1139                             MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
1140         }
1141     }
1142
1143     if (msg == WM_LBUTTONUP)
1144     {
1145         hittest = SCROLL_trackHitTest;
1146         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1147
1148         if (hittest == SCROLL_THUMB)
1149         {
1150             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1151                                  trackThumbPos + lastMousePos - lastClickPos );
1152             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1153                             MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
1154         }
1155         SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1156                           SB_ENDSCROLL, (LPARAM)hwndCtl );
1157     }
1158
1159     ReleaseDC( hwnd, hdc );
1160 }
1161
1162
1163 /***********************************************************************
1164  *           SCROLL_TrackScrollBar
1165  *
1166  * Track a mouse button press on a scroll-bar.
1167  * pt is in screen-coordinates for non-client scroll bars.
1168  */
1169 void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
1170 {
1171     MSG msg;
1172     INT xoffset = 0, yoffset = 0;
1173
1174     if (scrollbar != SB_CTL)
1175     {
1176         WND *wndPtr = WIN_GetPtr( hwnd );
1177         if (!wndPtr || wndPtr == WND_OTHER_PROCESS) return;
1178         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
1179         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
1180         WIN_ReleasePtr( wndPtr );
1181         ScreenToClient( hwnd, &pt );
1182         pt.x += xoffset;
1183         pt.y += yoffset;
1184     }
1185
1186     SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
1187
1188     do
1189     {
1190         if (!GetMessageW( &msg, 0, 0, 0 )) break;
1191         if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
1192         switch(msg.message)
1193         {
1194         case WM_LBUTTONUP:
1195         case WM_MOUSEMOVE:
1196         case WM_SYSTIMER:
1197             pt.x = LOWORD(msg.lParam) + xoffset;
1198             pt.y = HIWORD(msg.lParam) + yoffset;
1199             SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
1200             break;
1201         default:
1202             TranslateMessage( &msg );
1203             DispatchMessageW( &msg );
1204             break;
1205         }
1206         if (!IsWindow( hwnd ))
1207         {
1208             ReleaseCapture();
1209             break;
1210         }
1211     } while (msg.message != WM_LBUTTONUP);
1212 }
1213
1214
1215 /***********************************************************************
1216  *           SCROLL_CreateScrollBar
1217  *
1218  *  Create a scroll bar
1219  */
1220 static void SCROLL_CreateScrollBar(
1221 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1222 LPCREATESTRUCTW lpCreate /* [in] The style and place of the scroll bar */)
1223 {
1224     LPSCROLLBAR_INFO info = SCROLL_GetScrollBarInfo(hwnd, SB_CTL);
1225     if (!info) return;
1226
1227     TRACE("hwnd=%p lpCreate=%p\n", hwnd, lpCreate);
1228
1229     if (lpCreate->style & WS_DISABLED)
1230     {
1231         info->flags = ESB_DISABLE_BOTH;
1232         TRACE("Created WS_DISABLED scrollbar\n");
1233     }
1234
1235     if (lpCreate->style & SBS_VERT)
1236     {
1237         if (lpCreate->style & SBS_LEFTALIGN)
1238             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1239                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1240         else if (lpCreate->style & SBS_RIGHTALIGN)
1241             MoveWindow( hwnd,
1242                         lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1243                         lpCreate->y,
1244                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1245     }
1246     else  /* SBS_HORZ */
1247     {
1248         if (lpCreate->style & SBS_TOPALIGN)
1249             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1250                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1251         else if (lpCreate->style & SBS_BOTTOMALIGN)
1252             MoveWindow( hwnd,
1253                         lpCreate->x,
1254                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1255                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1256     }
1257 }
1258
1259
1260 /*************************************************************************
1261  *           SCROLL_GetScrollInfo
1262  *
1263  *  Internal helper for the API function
1264  */
1265 static BOOL SCROLL_GetScrollInfo(
1266 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1267 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1268 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1269 {
1270     LPSCROLLBAR_INFO infoPtr;
1271
1272     /* handle invalid data structure */
1273     if (!SCROLL_ScrollInfoValid(info)
1274         || !(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar)))
1275             return FALSE;
1276
1277     /* fill in the desired scroll info structure */
1278     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
1279     if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
1280     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1281         info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
1282     if (info->fMask & SIF_RANGE)
1283     {
1284         info->nMin = infoPtr->minVal;
1285         info->nMax = infoPtr->maxVal;
1286     }
1287
1288     return (info->fMask & SIF_ALL) != 0;
1289 }
1290
1291
1292 /*************************************************************************
1293  *           SCROLL_GetScrollPos
1294  *
1295  *  Internal helper for the API function
1296  */
1297 static INT SCROLL_GetScrollPos(
1298 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1299 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1300 {
1301     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1302     return infoPtr ? infoPtr->curVal: 0;
1303 }
1304
1305
1306 /*************************************************************************
1307  *           SCROLL_GetScrollRange
1308  *
1309  *  Internal helper for the API function
1310  *
1311  * RETURNS STD
1312  */
1313 static BOOL SCROLL_GetScrollRange(
1314 HWND hwnd, /* [in] Handle of window */
1315 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */
1316 LPINT lpMin, /* [out] Where to store minimum value */
1317 LPINT lpMax /* [out] Where to store maximum value */)
1318 {
1319     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1320
1321     if (lpMin) *lpMin = infoPtr ? infoPtr->minVal : 0;
1322     if (lpMax) *lpMax = infoPtr ? infoPtr->maxVal : 0;
1323
1324     return infoPtr ? TRUE : FALSE;
1325 }
1326
1327
1328
1329 /***********************************************************************
1330  *           ScrollBarWndProc
1331  */
1332 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
1333 {
1334     if (!IsWindow( hwnd )) return 0;
1335
1336     switch(message)
1337     {
1338     case WM_CREATE:
1339         SCROLL_CreateScrollBar(hwnd, (LPCREATESTRUCTW)lParam);
1340         if (!hUpArrow) SCROLL_LoadBitmaps();
1341         break;
1342
1343     case WM_ENABLE:
1344         {
1345             SCROLLBAR_INFO *infoPtr;
1346             if ((infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_CTL )))
1347             {
1348                 infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
1349                 SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
1350             }
1351         }
1352         return 0;
1353
1354     case WM_LBUTTONDOWN:
1355         {
1356             POINT pt;
1357             pt.x = SLOWORD(lParam);
1358             pt.y = SHIWORD(lParam);
1359             SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
1360         }
1361         break;
1362     case WM_LBUTTONUP:
1363     case WM_MOUSEMOVE:
1364     case WM_SYSTIMER:
1365         {
1366             POINT pt;
1367             pt.x = SLOWORD(lParam);
1368             pt.y = SHIWORD(lParam);
1369             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1370         }
1371         break;
1372
1373     case WM_KEYDOWN:
1374         SCROLL_HandleKbdEvent(hwnd, wParam, lParam);
1375         break;
1376
1377     case WM_KEYUP:
1378         ShowCaret(hwnd);
1379         break;
1380
1381     case WM_SETFOCUS:
1382         {
1383             /* Create a caret when a ScrollBar get focus */
1384             RECT rect;
1385             int arrowSize, thumbSize, thumbPos, vertical;
1386             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
1387                                                 &arrowSize, &thumbSize, &thumbPos );
1388             if (!vertical)
1389             {
1390                 CreateCaret(hwnd, (HBITMAP)1, thumbSize-2, rect.bottom-rect.top-2);
1391                 SetCaretPos(thumbPos+1, rect.top+1);
1392             }
1393             else
1394             {
1395                 CreateCaret(hwnd, (HBITMAP)1, rect.right-rect.left-2,thumbSize-2);
1396                 SetCaretPos(rect.top+1, thumbPos+1);
1397             }
1398             ShowCaret(hwnd);
1399         }
1400         break;
1401
1402     case WM_KILLFOCUS:
1403         {
1404             RECT rect;
1405             int arrowSize, thumbSize, thumbPos, vertical;
1406             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
1407             if (!vertical){
1408                 rect.left=thumbPos+1;
1409                 rect.right=rect.left+thumbSize;
1410             }
1411             else
1412             {
1413                 rect.top=thumbPos+1;
1414                 rect.bottom=rect.top+thumbSize;
1415             }
1416             HideCaret(hwnd);
1417             InvalidateRect(hwnd,&rect,0);
1418             DestroyCaret();
1419         }
1420         break;
1421
1422     case WM_ERASEBKGND:
1423          return 1;
1424
1425     case WM_GETDLGCODE:
1426          return DLGC_WANTARROWS; /* Windows returns this value */
1427
1428     case WM_PAINT:
1429         {
1430             PAINTSTRUCT ps;
1431             HDC hdc = BeginPaint( hwnd, &ps );
1432             if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEBOX)
1433                 FillRect( hdc, &ps.rcPaint, GetSysColorBrush(COLOR_SCROLLBAR) );
1434             else
1435                 SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1436             EndPaint( hwnd, &ps );
1437         }
1438         break;
1439
1440     case SBM_SETPOS16:
1441     case SBM_SETPOS:
1442         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1443
1444     case SBM_GETPOS16:
1445     case SBM_GETPOS:
1446        return SCROLL_GetScrollPos(hwnd, SB_CTL);
1447
1448     case SBM_SETRANGE16:
1449         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
1450                           wParam  /* FIXME: Is this correct? */ );
1451         return 0;
1452
1453     case SBM_SETRANGE:
1454         {
1455             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1456             SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
1457             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1458         }
1459         return 0;
1460
1461     case SBM_GETRANGE16:
1462         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
1463         return 0;
1464
1465     case SBM_GETRANGE:
1466         return SCROLL_GetScrollRange(hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam);
1467
1468     case SBM_ENABLE_ARROWS16:
1469     case SBM_ENABLE_ARROWS:
1470         return EnableScrollBar( hwnd, SB_CTL, wParam );
1471
1472     case SBM_SETRANGEREDRAW:
1473         {
1474             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1475             SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
1476             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1477         }
1478         return 0;
1479
1480     case SBM_SETSCROLLINFO:
1481         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1482
1483     case SBM_GETSCROLLINFO:
1484         return SCROLL_GetScrollInfo(hwnd, SB_CTL, (SCROLLINFO *)lParam);
1485
1486     case 0x00e5:
1487     case 0x00e7:
1488     case 0x00e8:
1489     case 0x00eb:
1490     case 0x00ec:
1491     case 0x00ed:
1492     case 0x00ee:
1493     case 0x00ef:
1494         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1495                     message, wParam, lParam );
1496         break;
1497
1498     default:
1499         if (message >= WM_USER)
1500             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1501                          message, wParam, lParam );
1502         return DefWindowProcW( hwnd, message, wParam, lParam );
1503     }
1504     return 0;
1505 }
1506
1507
1508 /*************************************************************************
1509  *           SetScrollInfo   (USER32.@)
1510  * SetScrollInfo can be used to set the position, upper bound,
1511  * lower bound, and page size of a scrollbar control.
1512  *
1513  * RETURNS
1514  *    Scrollbar position
1515  *
1516  * NOTE
1517  *    For 100 lines of text to be displayed in a window of 25 lines,
1518  *  one would for instance use info->nMin=0, info->nMax=75
1519  *  (corresponding to the 76 different positions of the window on
1520  *  the text), and info->nPage=25.
1521  */
1522 INT WINAPI SetScrollInfo(
1523 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1524 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1525 const SCROLLINFO *info /* [in] Specifies what to change and new values */,
1526 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1527 {
1528     INT action;
1529     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1530
1531     if( action & SA_SSI_HIDE )
1532         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1533     else
1534     {
1535         if( action & SA_SSI_SHOW )
1536             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1537                 return retVal; /* SetWindowPos() already did the painting */
1538
1539         if( bRedraw && (action & SA_SSI_REFRESH))
1540             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1541         else if( action & SA_SSI_REPAINT_ARROWS )
1542             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1543     }
1544     return retVal;
1545 }
1546
1547 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1548                             const SCROLLINFO *info, INT *action  )
1549 {
1550     /* Update the scrollbar state and set action flags according to
1551      * what has to be done graphics wise. */
1552
1553     SCROLLBAR_INFO *infoPtr;
1554     UINT new_flags;
1555     BOOL bChangeParams = FALSE; /* don't show/hide scrollbar if params don't change */
1556
1557    *action = 0;
1558
1559     if (!(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar))) return 0;
1560     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1561     if ((info->cbSize != sizeof(*info)) &&
1562         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1563
1564     if (TRACE_ON(scroll))
1565     {
1566         TRACE("hwnd=%p bar=%d", hwnd, nBar);
1567         if (info->fMask & SIF_PAGE) TRACE( " page=%d", info->nPage );
1568         if (info->fMask & SIF_POS) TRACE( " pos=%d", info->nPos );
1569         if (info->fMask & SIF_RANGE) TRACE( " min=%d max=%d", info->nMin, info->nMax );
1570         TRACE("\n");
1571     }
1572
1573     /* Set the page size */
1574
1575     if (info->fMask & SIF_PAGE)
1576     {
1577         if( infoPtr->page != info->nPage )
1578         {
1579             infoPtr->page = info->nPage;
1580            *action |= SA_SSI_REFRESH;
1581            bChangeParams = TRUE;
1582         }
1583     }
1584
1585     /* Set the scroll pos */
1586
1587     if (info->fMask & SIF_POS)
1588     {
1589         if( infoPtr->curVal != info->nPos )
1590         {
1591             infoPtr->curVal = info->nPos;
1592            *action |= SA_SSI_REFRESH;
1593         }
1594     }
1595
1596     /* Set the scroll range */
1597
1598     if (info->fMask & SIF_RANGE)
1599     {
1600         /* Invalid range -> range is set to (0,0) */
1601         if ((info->nMin > info->nMax) ||
1602             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1603         {
1604             infoPtr->minVal = 0;
1605             infoPtr->maxVal = 0;
1606             bChangeParams = TRUE;
1607         }
1608         else
1609         {
1610             if( infoPtr->minVal != info->nMin ||
1611                 infoPtr->maxVal != info->nMax )
1612             {
1613                 *action |= SA_SSI_REFRESH;
1614                 infoPtr->minVal = info->nMin;
1615                 infoPtr->maxVal = info->nMax;
1616                 bChangeParams = TRUE;
1617             }
1618         }
1619     }
1620
1621     /* Make sure the page size is valid */
1622
1623     if (infoPtr->page < 0) infoPtr->page = 0;
1624     else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
1625         infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
1626
1627     /* Make sure the pos is inside the range */
1628
1629     if (infoPtr->curVal < infoPtr->minVal)
1630         infoPtr->curVal = infoPtr->minVal;
1631     else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1632         infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
1633
1634     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1635                  infoPtr->page, infoPtr->curVal,
1636                  infoPtr->minVal, infoPtr->maxVal );
1637
1638     /* don't change the scrollbar state if SetScrollInfo
1639      * is just called with SIF_DISABLENOSCROLL
1640      */
1641     if(!(info->fMask & SIF_ALL)) goto done;
1642
1643     /* Check if the scrollbar should be hidden or disabled */
1644
1645     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1646     {
1647         new_flags = infoPtr->flags;
1648         if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1649         {
1650             /* Hide or disable scroll-bar */
1651             if (info->fMask & SIF_DISABLENOSCROLL)
1652             {
1653                 new_flags = ESB_DISABLE_BOTH;
1654                *action |= SA_SSI_REFRESH;
1655             }
1656             else if ((nBar != SB_CTL) && bChangeParams)
1657             {
1658                 *action = SA_SSI_HIDE;
1659                 goto done;
1660             }
1661         }
1662         else  /* Show and enable scroll-bar */
1663         {
1664             new_flags = 0;
1665             if ((nBar != SB_CTL) && bChangeParams)
1666                 *action |= SA_SSI_SHOW;
1667         }
1668
1669         if (infoPtr->flags != new_flags) /* check arrow flags */
1670         {
1671             infoPtr->flags = new_flags;
1672            *action |= SA_SSI_REPAINT_ARROWS;
1673         }
1674     }
1675
1676 done:
1677     /* Return current position */
1678
1679     return infoPtr->curVal;
1680 }
1681
1682
1683 /*************************************************************************
1684  *           GetScrollInfo   (USER32.@)
1685  *
1686  * GetScrollInfo can be used to retrieve the position, upper bound,
1687  * lower bound, and page size of a scrollbar control.
1688  *
1689  * RETURNS STD
1690  */
1691 BOOL WINAPI GetScrollInfo(
1692 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1693 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1694 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1695 {
1696     TRACE("hwnd=%p nBar=%d info=%p\n", hwnd, nBar, info);
1697
1698     /* Refer SB_CTL requests to the window */
1699     if (nBar == SB_CTL)
1700         return SendMessageA(hwnd, SBM_GETSCROLLINFO, (WPARAM)0, (LPARAM)info);
1701     else
1702         return SCROLL_GetScrollInfo(hwnd, nBar, info);
1703 }
1704
1705
1706 /*************************************************************************
1707  *           SetScrollPos   (USER32.@)
1708  *
1709  * RETURNS
1710  *    Success: Scrollbar position
1711  *    Failure: 0
1712  *
1713  * REMARKS
1714  *    Note the ambiguity when 0 is returned.  Use GetLastError
1715  *    to make sure there was an error (and to know which one).
1716  */
1717 INT WINAPI SetScrollPos(
1718 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1719 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1720 INT nPos /* [in] New value */,
1721 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */ )
1722 {
1723     SCROLLINFO info;
1724     SCROLLBAR_INFO *infoPtr;
1725     INT oldPos;
1726
1727     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return 0;
1728     oldPos      = infoPtr->curVal;
1729     info.cbSize = sizeof(info);
1730     info.nPos   = nPos;
1731     info.fMask  = SIF_POS;
1732     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1733     return oldPos;
1734 }
1735
1736
1737 /*************************************************************************
1738  *           GetScrollPos   (USER32.@)
1739  *
1740  * RETURNS
1741  *    Success: Current position
1742  *    Failure: 0
1743  *
1744  * REMARKS
1745  *    There is ambiguity when 0 is returned.  Use GetLastError
1746  *    to make sure there was an error (and to know which one).
1747  */
1748 INT WINAPI GetScrollPos(
1749 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1750 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1751 {
1752     TRACE("hwnd=%p nBar=%d\n", hwnd, nBar);
1753
1754     /* Refer SB_CTL requests to the window */
1755     if (nBar == SB_CTL)
1756         return SendMessageA(hwnd, SBM_GETPOS, (WPARAM)0, (LPARAM)0);
1757     else
1758         return SCROLL_GetScrollPos(hwnd, nBar);
1759 }
1760
1761
1762 /*************************************************************************
1763  *           SetScrollRange   (USER32.@)
1764  *
1765  * RETURNS STD
1766  */
1767 BOOL WINAPI SetScrollRange(
1768 HWND hwnd, /* [in] Handle of window whose scrollbar will be affected */
1769 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */
1770 INT minVal, /* [in] New minimum value */
1771 INT maxVal, /* [in] New maximum value */
1772 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1773 {
1774     SCROLLINFO info;
1775
1776     info.cbSize = sizeof(info);
1777     info.nMin   = minVal;
1778     info.nMax   = maxVal;
1779     info.fMask  = SIF_RANGE;
1780     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1781     return TRUE;
1782 }
1783
1784
1785 /*************************************************************************
1786  *           SCROLL_SetNCSbState
1787  *
1788  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1789  */
1790 INT SCROLL_SetNCSbState(HWND hwnd, int vMin, int vMax, int vPos,
1791                         int hMin, int hMax, int hPos)
1792 {
1793     INT vA, hA;
1794     SCROLLINFO vInfo, hInfo;
1795
1796     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1797     vInfo.nMin   = vMin;
1798     vInfo.nMax   = vMax;
1799     vInfo.nPos   = vPos;
1800     hInfo.nMin   = hMin;
1801     hInfo.nMax   = hMax;
1802     hInfo.nPos   = hPos;
1803     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1804
1805     SCROLL_SetScrollInfo( hwnd, SB_VERT, &vInfo, &vA );
1806     SCROLL_SetScrollInfo( hwnd, SB_HORZ, &hInfo, &hA );
1807
1808     if( !SCROLL_ShowScrollBar( hwnd, SB_BOTH,
1809                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1810     {
1811         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1812         if( vA & SA_SSI_REFRESH )
1813             SCROLL_RefreshScrollBar( hwnd, SB_VERT, FALSE, TRUE );
1814
1815         if( hA & SA_SSI_REFRESH )
1816             SCROLL_RefreshScrollBar( hwnd, SB_HORZ, FALSE, TRUE );
1817     }
1818     return 0;
1819 }
1820
1821
1822 /*************************************************************************
1823  *           GetScrollRange   (USER32.@)
1824  *
1825  * RETURNS STD
1826  */
1827 BOOL WINAPI GetScrollRange(
1828 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1829 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */,
1830 LPINT lpMin /* [out] Where to store minimum value */,
1831 LPINT lpMax /* [out] Where to store maximum value */)
1832 {
1833     TRACE("hwnd=%p nBar=%d lpMin=%p lpMax=%p\n", hwnd, nBar, lpMin, lpMax);
1834
1835     /* Refer SB_CTL requests to the window */
1836     if (nBar == SB_CTL)
1837         return SendMessageA(hwnd, SBM_GETRANGE, (WPARAM)lpMin, (LPARAM)lpMax);
1838     else
1839         return SCROLL_GetScrollRange(hwnd, nBar, lpMin, lpMax);
1840 }
1841
1842
1843 /*************************************************************************
1844  *           SCROLL_ShowScrollBar()
1845  *
1846  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1847  */
1848 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1849                              BOOL fShowH, BOOL fShowV )
1850 {
1851     LONG style = GetWindowLongW( hwnd, GWL_STYLE );
1852
1853     TRACE("hwnd=%p bar=%d horz=%d, vert=%d\n", hwnd, nBar, fShowH, fShowV );
1854
1855     switch(nBar)
1856     {
1857     case SB_CTL:
1858         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1859         return TRUE;
1860
1861     case SB_BOTH:
1862     case SB_HORZ:
1863         if (fShowH)
1864         {
1865             fShowH = !(style & WS_HSCROLL);
1866             style |= WS_HSCROLL;
1867         }
1868         else  /* hide it */
1869         {
1870             fShowH = (style & WS_HSCROLL);
1871             style &= ~WS_HSCROLL;
1872         }
1873         if( nBar == SB_HORZ ) {
1874             fShowV = FALSE;
1875             break;
1876         }
1877         /* fall through */
1878
1879     case SB_VERT:
1880         if (fShowV)
1881         {
1882             fShowV = !(style & WS_VSCROLL);
1883             style |= WS_VSCROLL;
1884         }
1885         else  /* hide it */
1886         {
1887             fShowV = (style & WS_VSCROLL);
1888             style &= ~WS_VSCROLL;
1889         }
1890         if ( nBar == SB_VERT )
1891            fShowH = FALSE;
1892         break;
1893
1894     default:
1895         return FALSE;  /* Nothing to do! */
1896     }
1897
1898     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1899     {
1900         WIN_SetStyle( hwnd, style );
1901         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1902                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1903         return TRUE;
1904     }
1905     return FALSE; /* no frame changes */
1906 }
1907
1908
1909 /*************************************************************************
1910  *           ShowScrollBar   (USER32.@)
1911  *
1912  * RETURNS STD
1913  */
1914 BOOL WINAPI ShowScrollBar(
1915 HWND hwnd, /* [in] Handle of window whose scrollbar(s) will be affected   */
1916 INT nBar, /* [in] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1917 BOOL fShow /* [in] TRUE = show, FALSE = hide  */)
1918 {
1919     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1920                                       (nBar == SB_HORZ) ? 0 : fShow );
1921     return TRUE;
1922 }
1923
1924
1925 /*************************************************************************
1926  *           EnableScrollBar   (USER32.@)
1927  */
1928 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1929 {
1930     BOOL bFineWithMe;
1931     SCROLLBAR_INFO *infoPtr;
1932
1933     TRACE("%p %d %d\n", hwnd, nBar, flags );
1934
1935     flags &= ESB_DISABLE_BOTH;
1936
1937     if (nBar == SB_BOTH)
1938     {
1939         if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_VERT ))) return FALSE;
1940         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1941         {
1942             infoPtr->flags = flags;
1943             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1944         }
1945         nBar = SB_HORZ;
1946     }
1947     else
1948         bFineWithMe = TRUE;
1949
1950     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return FALSE;
1951     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1952     infoPtr->flags = flags;
1953
1954     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1955     return TRUE;
1956 }