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 <stdarg.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "wingdi.h"
  27 #include "wine/winuser16.h"
  28 #include "controls.h"
  29 #include "win.h"
  30 #include "wine/debug.h"
  31 #include "user.h"
  32 #include "message.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
  35
  36 typedef struct
  37 {
  38     INT   curVal;   /* Current scroll-bar value */
  39     INT   minVal;   /* Minimum scroll-bar value */
  40     INT   maxVal;   /* Maximum scroll-bar value */
  41     INT   page;     /* Page size of scroll bar (Win32) */
  42     UINT  flags;    /* EnableScrollBar flags */
  43 } SCROLLBAR_INFO, *LPSCROLLBAR_INFO;
  44
  45
  46 static HBITMAP hUpArrow;
  47 static HBITMAP hDnArrow;
  48 static HBITMAP hLfArrow;
  49 static HBITMAP hRgArrow;
  50 static HBITMAP hUpArrowD;
  51 static HBITMAP hDnArrowD;
  52 static HBITMAP hLfArrowD;
  53 static HBITMAP hRgArrowD;
  54 static HBITMAP hUpArrowI;
  55 static HBITMAP hDnArrowI;
  56 static HBITMAP hLfArrowI;
  57 static HBITMAP hRgArrowI;
  58
  59 #define TOP_ARROW(flags,pressed) \
  60    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  61 #define BOTTOM_ARROW(flags,pressed) \
  62    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  63 #define LEFT_ARROW(flags,pressed) \
  64    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  65 #define RIGHT_ARROW(flags,pressed) \
  66    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  67
  68
  69   /* Minimum size of the rectangle between the arrows */
  70 #define SCROLL_MIN_RECT  4
  71
  72   /* Minimum size of the thumb in pixels */
  73 #define SCROLL_MIN_THUMB 6
  74
  75   /* Overlap between arrows and thumb */
  76 #define SCROLL_ARROW_THUMB_OVERLAP ((TWEAK_WineLook == WIN31_LOOK) ? 1 : 0)
  77
  78   /* Delay (in ms) before first repetition when holding the button down */
  79 #define SCROLL_FIRST_DELAY   200
  80
  81   /* Delay (in ms) between scroll repetitions */
  82 #define SCROLL_REPEAT_DELAY  50
  83
  84   /* Scroll timer id */
  85 #define SCROLL_TIMER   0
  86
  87   /* Scroll-bar hit testing */
  88 enum SCROLL_HITTEST
  89 {
  90     SCROLL_NOWHERE,      /* Outside the scroll bar */
  91     SCROLL_TOP_ARROW,    /* Top or left arrow */
  92     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  93     SCROLL_THUMB,        /* Thumb rectangle */
  94     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  95     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  96 };
  97
  98  /* What to do after SCROLL_SetScrollInfo() */
  99 #define SA_SSI_HIDE             0x0001
 100 #define SA_SSI_SHOW             0x0002
 101 #define SA_SSI_REFRESH          0x0004
 102 #define SA_SSI_REPAINT_ARROWS   0x0008
 103
 104  /* Thumb-tracking info */
 105 static HWND SCROLL_TrackingWin = 0;
 106 static INT  SCROLL_TrackingBar = 0;
 107 static INT  SCROLL_TrackingPos = 0;
 108 static INT  SCROLL_TrackingVal = 0;
 109  /* Hit test code of the last button-down event */
 110 static enum SCROLL_HITTEST SCROLL_trackHitTest;
 111 static BOOL SCROLL_trackVertical;
 112
 113  /* Is the moving thumb being displayed? */
 114 static BOOL SCROLL_MovingThumb = FALSE;
 115
 116  /* Local functions */
 117 static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
 118                                     BOOL fShowH, BOOL fShowV );
 119 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
 120                                    const SCROLLINFO *info, INT *action );
 121 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 122                                     RECT *rect, INT arrowSize,
 123                                     INT thumbSize, INT thumbPos,
 124                                     UINT flags, BOOL vertical,
 125                                     BOOL top_selected, BOOL bottom_selected );
 126 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
 127
 128
 129 /*********************************************************************
 130  * scrollbar class descriptor
 131  */
 132 const struct builtin_class_descr SCROLL_builtin_class =
 133 {
 134     "ScrollBar",            /* name */
 135     CS_GLOBALCLASS | CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
 136     NULL,                   /* procA (winproc is Unicode only) */
 137     ScrollBarWndProc,       /* procW */
 138     sizeof(SCROLLBAR_INFO), /* extra */
 139     IDC_ARROW,              /* cursor */
 140     0                       /* brush */
 141 };
 142
 143 /***********************************************************************
 144  *           SCROLL_ScrollInfoValid
 145  *
 146  *  Determine if the supplied SCROLLINFO struct is valid.
 147  */
 148 inline static BOOL SCROLL_ScrollInfoValid(
 149 LPSCROLLINFO info /* [in] The SCROLLINFO struct to be tested */)
 150 {
 151     return !(info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)
 152         || (info->cbSize != sizeof(*info)
 153             && info->cbSize != sizeof(*info) - sizeof(info->nTrackPos)));
 154 }
 155
 156
 157 /***********************************************************************
 158  *           SCROLL_LoadBitmaps
 159  */
 160 static void SCROLL_LoadBitmaps(void)
 161 {
 162     hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
 163     hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
 164     hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
 165     hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
 166     hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
 167     hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
 168     hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
 169     hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
 170     hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
 171     hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
 172     hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
 173     hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
 174 }
 175
 176
 177 /***********************************************************************
 178  *           SCROLL_GetScrollBarInfo
 179  */
 180 static SCROLLBAR_INFO *SCROLL_GetScrollBarInfo( HWND hwnd, INT nBar )
 181 {
 182     SCROLLBAR_INFO *infoPtr;
 183     WND *wndPtr = WIN_FindWndPtr( hwnd );
 184
 185     if (!wndPtr) return NULL;
 186     switch(nBar)
 187     {
 188         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 189         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 190         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 191         default:
 192             WIN_ReleaseWndPtr( wndPtr );
 193             return NULL;
 194     }
 195
 196     if (!infoPtr)  /* Create the info structure if needed */
 197     {
 198         if ((infoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(SCROLLBAR_INFO) )))
 199         {
 200             infoPtr->minVal = infoPtr->curVal = infoPtr->page = 0;
 201             infoPtr->maxVal = 100;
 202             infoPtr->flags  = ESB_ENABLE_BOTH;
 203             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 204             else wndPtr->pVScroll = infoPtr;
 205         }
 206         if (!hUpArrow) SCROLL_LoadBitmaps();
 207     }
 208     WIN_ReleaseWndPtr( wndPtr );
 209     return infoPtr;
 210 }
 211
 212
 213 /***********************************************************************
 214  *           SCROLL_GetScrollBarRect
 215  *
 216  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 217  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 218  * 'arrowSize' returns the width or height of an arrow (depending on
 219  * the orientation of the scrollbar), 'thumbSize' returns the size of
 220  * the thumb, and 'thumbPos' returns the position of the thumb
 221  * relative to the left or to the top.
 222  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 223  */
 224 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 225                                        INT *arrowSize, INT *thumbSize,
 226                                        INT *thumbPos )
 227 {
 228     INT pixels;
 229     BOOL vertical;
 230     WND *wndPtr = WIN_FindWndPtr( hwnd );
 231
 232     switch(nBar)
 233     {
 234       case SB_HORZ:
 235         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 236         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 237         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 238         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 239         if(wndPtr->dwStyle & WS_BORDER) {
 240           lprect->left--;
 241           lprect->right++;
 242         } else if(wndPtr->dwStyle & WS_VSCROLL)
 243           lprect->right++;
 244         vertical = FALSE;
 245         break;
 246
 247       case SB_VERT:
 248         if((wndPtr->dwExStyle & WS_EX_LEFTSCROLLBAR) != 0)
 249             lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - GetSystemMetrics(SM_CXVSCROLL);
 250         else
 251             lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 252         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 253         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 254         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 255         if(wndPtr->dwStyle & WS_BORDER) {
 256           lprect->top--;
 257           lprect->bottom++;
 258         } else if(wndPtr->dwStyle & WS_HSCROLL)
 259           lprect->bottom++;
 260         vertical = TRUE;
 261         break;
 262
 263       case SB_CTL:
 264         GetClientRect( hwnd, lprect );
 265         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 266         break;
 267
 268     default:
 269         WIN_ReleaseWndPtr(wndPtr);
 270         return FALSE;
 271     }
 272
 273     if (vertical) pixels = lprect->bottom - lprect->top;
 274     else pixels = lprect->right - lprect->left;
 275
 276     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 277     {
 278         if (pixels > SCROLL_MIN_RECT)
 279             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 280         else
 281             *arrowSize = 0;
 282         *thumbPos = *thumbSize = 0;
 283     }
 284     else
 285     {
 286         SCROLLBAR_INFO *info = SCROLL_GetScrollBarInfo( hwnd, nBar );
 287
 288         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 289         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 290
 291         if (info->page)
 292         {
 293             *thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
 294             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 295         }
 296         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 297
 298         if (((pixels -= *thumbSize ) < 0) ||
 299             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 300         {
 301             /* Rectangle too small or scrollbar disabled -> no thumb */
 302             *thumbPos = *thumbSize = 0;
 303         }
 304         else
 305         {
 306             INT max = info->maxVal - max( info->page-1, 0 );
 307             if (info->minVal >= max)
 308                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 309             else
 310                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 311                   + MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
 312         }
 313     }
 314     WIN_ReleaseWndPtr(wndPtr);
 315     return vertical;
 316 }
 317
 318
 319 /***********************************************************************
 320  *           SCROLL_GetThumbVal
 321  *
 322  * Compute the current scroll position based on the thumb position in pixels
 323  * from the top of the scroll-bar.
 324  */
 325 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 326                                   BOOL vertical, INT pos )
 327 {
 328     INT thumbSize;
 329     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 330
 331     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 332         return infoPtr->minVal;
 333
 334     if (infoPtr->page)
 335     {
 336         thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
 337         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 338     }
 339     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 340
 341     if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
 342
 343     pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 344     if (pos > pixels) pos = pixels;
 345
 346     if (!infoPtr->page) pos *= infoPtr->maxVal - infoPtr->minVal;
 347     else pos *= infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
 348     return infoPtr->minVal + ((pos + pixels / 2) / pixels);
 349 }
 350
 351 /***********************************************************************
 352  *           SCROLL_PtInRectEx
 353  */
 354 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 355 {
 356     RECT rect = *lpRect;
 357
 358     if (vertical)
 359     {
 360         rect.left -= lpRect->right - lpRect->left;
 361         rect.right += lpRect->right - lpRect->left;
 362     }
 363     else
 364     {
 365         rect.top -= lpRect->bottom - lpRect->top;
 366         rect.bottom += lpRect->bottom - lpRect->top;
 367     }
 368     return PtInRect( &rect, pt );
 369 }
 370
 371 /***********************************************************************
 372  *           SCROLL_ClipPos
 373  */
 374 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 375 {
 376     if( pt.x < lpRect->left )
 377         pt.x = lpRect->left;
 378     else
 379     if( pt.x > lpRect->right )
 380         pt.x = lpRect->right;
 381
 382     if( pt.y < lpRect->top )
 383         pt.y = lpRect->top;
 384     else
 385     if( pt.y > lpRect->bottom )
 386         pt.y = lpRect->bottom;
 387
 388     return pt;
 389 }
 390
 391
 392 /***********************************************************************
 393  *           SCROLL_HitTest
 394  *
 395  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 396  */
 397 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 398                                            POINT pt, BOOL bDragging )
 399 {
 400     INT arrowSize, thumbSize, thumbPos;
 401     RECT rect;
 402
 403     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 404                                            &arrowSize, &thumbSize, &thumbPos );
 405
 406     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 407          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 408
 409     if (vertical)
 410     {
 411         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 412         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 413         if (!thumbPos) return SCROLL_TOP_RECT;
 414         pt.y -= rect.top;
 415         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 416         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 417     }
 418     else  /* horizontal */
 419     {
 420         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 421         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 422         if (!thumbPos) return SCROLL_TOP_RECT;
 423         pt.x -= rect.left;
 424         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 425         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 426     }
 427     return SCROLL_THUMB;
 428 }
 429
 430
 431 /***********************************************************************
 432  *           SCROLL_DrawArrows
 433  *
 434  * Draw the scroll bar arrows.
 435  */
 436 static void SCROLL_DrawArrows_9x( HDC hdc, SCROLLBAR_INFO *infoPtr,
 437                                   RECT *rect, INT arrowSize, BOOL vertical,
 438                                   BOOL top_pressed, BOOL bottom_pressed )
 439 {
 440   RECT r;
 441
 442   r = *rect;
 443   if( vertical )
 444     r.bottom = r.top + arrowSize;
 445   else
 446     r.right = r.left + arrowSize;
 447
 448   DrawFrameControl( hdc, &r, DFC_SCROLL,
 449                     (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
 450                     | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 451                     | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );
 452
 453   r = *rect;
 454   if( vertical )
 455     r.top = r.bottom-arrowSize;
 456   else
 457     r.left = r.right-arrowSize;
 458
 459   DrawFrameControl( hdc, &r, DFC_SCROLL,
 460                     (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
 461                     | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 462                     | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
 463 }
 464
 465 static void SCROLL_DrawArrows_31( HDC hdc, SCROLLBAR_INFO *infoPtr,
 466                                   RECT *rect, INT arrowSize, BOOL vertical,
 467                                   BOOL top_pressed, BOOL bottom_pressed )
 468 {
 469     HDC hdcMem = CreateCompatibleDC( hdc );
 470     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 471                                     TOP_ARROW(infoPtr->flags, top_pressed)
 472                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 473
 474     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 475     StretchBlt( hdc, rect->left, rect->top,
 476                   vertical ? rect->right-rect->left : arrowSize,
 477                   vertical ? arrowSize : rect->bottom-rect->top,
 478                   hdcMem, 0, 0,
 479                   GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 480                   SRCCOPY );
 481
 482     SelectObject( hdcMem, vertical ?
 483                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 484                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 485     if (vertical)
 486         StretchBlt( hdc, rect->left, rect->bottom - arrowSize,
 487                       rect->right - rect->left, arrowSize,
 488                       hdcMem, 0, 0,
 489                       GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 490                       SRCCOPY );
 491     else
 492         StretchBlt( hdc, rect->right - arrowSize, rect->top,
 493                       arrowSize, rect->bottom - rect->top,
 494                       hdcMem, 0, 0,
 495                       GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
 496                       SRCCOPY );
 497     SelectObject( hdcMem, hbmpPrev );
 498     DeleteDC( hdcMem );
 499 }
 500
 501 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 502                                RECT *rect, INT arrowSize, BOOL vertical,
 503                                BOOL top_pressed, BOOL bottom_pressed )
 504 {
 505   if( TWEAK_WineLook == WIN31_LOOK )
 506     SCROLL_DrawArrows_31( hdc, infoPtr, rect, arrowSize,
 507                           vertical, top_pressed,bottom_pressed );
 508   else
 509     SCROLL_DrawArrows_9x( hdc, infoPtr, rect, arrowSize,
 510                           vertical, top_pressed,bottom_pressed );
 511 }
 512
 513
 514 /***********************************************************************
 515  *           SCROLL_DrawMovingThumb
 516  *
 517  * Draw the moving thumb rectangle.
 518  */
 519 static void SCROLL_DrawMovingThumb_31( HDC hdc, RECT *rect, BOOL vertical,
 520                                        INT arrowSize, INT thumbSize )
 521 {
 522     RECT r = *rect;
 523     if (vertical)
 524     {
 525         r.top += SCROLL_TrackingPos;
 526         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 527             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 528         if (r.top + thumbSize >
 529                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 530             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 531                                                                   - thumbSize;
 532         r.bottom = r.top + thumbSize;
 533     }
 534     else
 535     {
 536         r.left += SCROLL_TrackingPos;
 537         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 538             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 539         if (r.left + thumbSize >
 540                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 541             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 542                                                                   - thumbSize;
 543         r.right = r.left + thumbSize;
 544     }
 545
 546     DrawFocusRect( hdc, &r );
 547     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 548 }
 549
 550 static void SCROLL_DrawMovingThumb_9x( HDC hdc, RECT *rect, BOOL vertical,
 551                                        INT arrowSize, INT thumbSize )
 552 {
 553   INT pos = SCROLL_TrackingPos;
 554   INT max_size;
 555
 556   if( vertical )
 557     max_size = rect->bottom - rect->top;
 558   else
 559     max_size = rect->right - rect->left;
 560
 561   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 562
 563   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 564     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 565   else if( pos > max_size )
 566     pos = max_size;
 567
 568   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 569                           rect, arrowSize, thumbSize, pos,
 570                           0, vertical, FALSE, FALSE );
 571
 572   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 573 }
 574
 575 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 576                                     INT arrowSize, INT thumbSize )
 577 {
 578   if( TWEAK_WineLook == WIN31_LOOK )
 579     SCROLL_DrawMovingThumb_31( hdc, rect, vertical, arrowSize, thumbSize );
 580   else
 581     SCROLL_DrawMovingThumb_9x( hdc, rect, vertical, arrowSize, thumbSize );
 582 }
 583
 584 /***********************************************************************
 585  *           SCROLL_DrawInterior
 586  *
 587  * Draw the scroll bar interior (everything except the arrows).
 588  */
 589 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 590                                     RECT *rect, INT arrowSize,
 591                                     INT thumbSize, INT thumbPos,
 592                                     UINT flags, BOOL vertical,
 593                                     BOOL top_selected, BOOL bottom_selected )
 594 {
 595     RECT r;
 596     HPEN hSavePen;
 597     HBRUSH hSaveBrush,hBrush;
 598
 599     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 600      * The window-owned scrollbars need to call DEFWND_ControlColor
 601      * to correctly setup default scrollbar colors
 602      */
 603     if (nBar == SB_CTL)
 604     {
 605       hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 606                                      (WPARAM)hdc,(LPARAM)hwnd);
 607     }
 608     else
 609     {
 610       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 611     }
 612
 613     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 614     hSaveBrush = SelectObject( hdc, hBrush );
 615
 616     /* Calculate the scroll rectangle */
 617     r = *rect;
 618     if (vertical)
 619     {
 620         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 621         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 622     }
 623     else
 624     {
 625         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 626         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 627     }
 628
 629     /* Draw the scroll rectangles and thumb */
 630     if (!thumbPos)  /* No thumb to draw */
 631     {
 632         PatBlt( hdc, r.left, r.top,
 633                      r.right - r.left, r.bottom - r.top,
 634                      PATCOPY );
 635
 636         /* cleanup and return */
 637         SelectObject( hdc, hSavePen );
 638         SelectObject( hdc, hSaveBrush );
 639         return;
 640     }
 641
 642     if (vertical)
 643     {
 644         PatBlt( hdc, r.left, r.top,
 645                   r.right - r.left,
 646                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 647                   top_selected ? 0x0f0000 : PATCOPY );
 648         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 649         PatBlt( hdc, r.left, r.top + thumbSize,
 650                   r.right - r.left,
 651                   r.bottom - r.top - thumbSize,
 652                   bottom_selected ? 0x0f0000 : PATCOPY );
 653         r.bottom = r.top + thumbSize;
 654     }
 655     else  /* horizontal */
 656     {
 657         PatBlt( hdc, r.left, r.top,
 658                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 659                   r.bottom - r.top,
 660                   top_selected ? 0x0f0000 : PATCOPY );
 661         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 662         PatBlt( hdc, r.left + thumbSize, r.top,
 663                   r.right - r.left - thumbSize,
 664                   r.bottom - r.top,
 665                   bottom_selected ? 0x0f0000 : PATCOPY );
 666         r.right = r.left + thumbSize;
 667     }
 668
 669     /* Draw the thumb */
 670     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 671
 672     /* cleanup */
 673     SelectObject( hdc, hSavePen );
 674     SelectObject( hdc, hSaveBrush );
 675 }
 676
 677
 678 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 679                                  RECT *rect, INT arrowSize,
 680                                  INT thumbSize, INT thumbPos,
 681                                  UINT flags, BOOL vertical,
 682                                  BOOL top_selected, BOOL bottom_selected )
 683 {
 684     RECT r;
 685     HPEN hSavePen;
 686     HBRUSH hSaveBrush,hBrush;
 687     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 688
 689     if (Save_SCROLL_MovingThumb &&
 690         (SCROLL_TrackingWin == hwnd) &&
 691         (SCROLL_TrackingBar == nBar))
 692         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 693
 694       /* Select the correct brush and pen */
 695
 696     if (TWEAK_WineLook == WIN31_LOOK && (flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 697     {
 698         /* This ought to be the color of the parent window */
 699         hBrush = GetSysColorBrush(COLOR_WINDOW);
 700     }
 701     else
 702     {
 703         /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 704          * The window-owned scrollbars need to call DEFWND_ControlColor
 705          * to correctly setup default scrollbar colors
 706          */
 707         if (nBar == SB_CTL) {
 708             hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 709                                            (WPARAM)hdc,(LPARAM)hwnd);
 710         } else {
 711             hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 712         }
 713     }
 714     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 715     hSaveBrush = SelectObject( hdc, hBrush );
 716
 717       /* Calculate the scroll rectangle */
 718
 719     r = *rect;
 720     if (vertical)
 721     {
 722         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 723         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 724     }
 725     else
 726     {
 727         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 728         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 729     }
 730
 731       /* Draw the scroll bar frame */
 732
 733         /* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
 734     if (TWEAK_WineLook == WIN31_LOOK)
 735         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 736
 737       /* Draw the scroll rectangles and thumb */
 738
 739     if (!thumbPos)  /* No thumb to draw */
 740     {
 741         INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 0 : 1;
 742
 743         PatBlt( hdc, r.left+offset, r.top+offset,
 744                      r.right - r.left - 2*offset, r.bottom - r.top - 2*offset,
 745                      PATCOPY );
 746
 747         /* cleanup and return */
 748         SelectObject( hdc, hSavePen );
 749         SelectObject( hdc, hSaveBrush );
 750         return;
 751     }
 752
 753     if (vertical)
 754     {
 755         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 756
 757         PatBlt( hdc, r.left + offset, r.top + offset,
 758                   r.right - r.left - offset*2,
 759                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - offset,
 760                   top_selected ? 0x0f0000 : PATCOPY );
 761         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 762         PatBlt( hdc, r.left + offset, r.top + thumbSize,
 763                   r.right - r.left - offset*2,
 764                   r.bottom - r.top - thumbSize - offset,
 765                   bottom_selected ? 0x0f0000 : PATCOPY );
 766         r.bottom = r.top + thumbSize;
 767     }
 768     else  /* horizontal */
 769     {
 770         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 771
 772         PatBlt( hdc, r.left + offset, r.top + offset,
 773                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 774                   r.bottom - r.top - offset*2,
 775                   top_selected ? 0x0f0000 : PATCOPY );
 776         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 777         PatBlt( hdc, r.left + thumbSize, r.top + offset,
 778                   r.right - r.left - thumbSize - offset,
 779                   r.bottom - r.top - offset*2,
 780                   bottom_selected ? 0x0f0000 : PATCOPY );
 781         r.right = r.left + thumbSize;
 782     }
 783
 784       /* Draw the thumb */
 785
 786     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 787     if (TWEAK_WineLook == WIN31_LOOK)
 788     {
 789         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 790         r.top++, r.left++;
 791     }
 792     else
 793     {
 794         Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 795     }
 796     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 797
 798     if (Save_SCROLL_MovingThumb &&
 799         (SCROLL_TrackingWin == hwnd) &&
 800         (SCROLL_TrackingBar == nBar))
 801         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 802
 803     /* cleanup */
 804     SelectObject( hdc, hSavePen );
 805     SelectObject( hdc, hSaveBrush );
 806 }
 807
 808
 809 /***********************************************************************
 810  *           SCROLL_DrawScrollBar
 811  *
 812  * Redraw the whole scrollbar.
 813  */
 814 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 815                            BOOL arrows, BOOL interior )
 816 {
 817     INT arrowSize, thumbSize, thumbPos;
 818     RECT rect;
 819     BOOL vertical;
 820     WND *wndPtr = WIN_FindWndPtr( hwnd );
 821     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 822     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 823
 824     if (!wndPtr || !infoPtr ||
 825         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 826         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 827     if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
 828     hwnd = wndPtr->hwndSelf;  /* make it a full handle */
 829
 830     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 831                                         &arrowSize, &thumbSize, &thumbPos );
 832
 833     /* do not draw if the scrollbar rectangle is empty */
 834     if(IsRectEmpty(&rect))
 835       goto END;
 836
 837     if (Save_SCROLL_MovingThumb &&
 838         (SCROLL_TrackingWin == hwnd) &&
 839         (SCROLL_TrackingBar == nBar))
 840         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 841
 842       /* Draw the arrows */
 843
 844     if (arrows && arrowSize)
 845     {
 846         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 847             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 848                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 849                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 850         else
 851             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 852                                                                FALSE, FALSE );
 853     }
 854     if( interior )
 855         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 856                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 857
 858     if (Save_SCROLL_MovingThumb &&
 859         (SCROLL_TrackingWin == hwnd) &&
 860         (SCROLL_TrackingBar == nBar))
 861         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 862
 863     /* if scroll bar has focus, reposition the caret */
 864     if(hwnd==GetFocus() && (nBar==SB_CTL))
 865     {
 866         if (!vertical)
 867         {
 868             SetCaretPos(thumbPos+1, rect.top+1);
 869         }
 870         else
 871         {
 872             SetCaretPos(rect.top+1, thumbPos+1);
 873         }
 874     }
 875
 876 END:
 877     WIN_ReleaseWndPtr(wndPtr);
 878 }
 879
 880
 881 /***********************************************************************
 882  *           SCROLL_RefreshScrollBar
 883  *
 884  * Repaint the scroll bar interior after a SetScrollRange() or
 885  * SetScrollPos() call.
 886  */
 887 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 888                                      BOOL arrows, BOOL interior )
 889 {
 890     HDC hdc = GetDCEx( hwnd, 0,
 891                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 892     if (!hdc) return;
 893
 894     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 895     ReleaseDC( hwnd, hdc );
 896 }
 897
 898
 899 /***********************************************************************
 900  *           SCROLL_HandleKbdEvent
 901  *
 902  * Handle a keyboard event (only for SB_CTL scrollbars with focus).
 903  */
 904 static void SCROLL_HandleKbdEvent(
 905 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
 906 WPARAM wParam /* [in] Variable input including enable state */,
 907 LPARAM lParam /* [in] Variable input including input point */)
 908 {
 909     TRACE("hwnd=%p wParam=%d lParam=%ld\n", hwnd, wParam, lParam);
 910
 911     /* hide caret on first KEYDOWN to prevent flicker */
 912     if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
 913         HideCaret(hwnd);
 914
 915     switch(wParam)
 916     {
 917     case VK_PRIOR: wParam = SB_PAGEUP; break;
 918     case VK_NEXT:  wParam = SB_PAGEDOWN; break;
 919     case VK_HOME:  wParam = SB_TOP; break;
 920     case VK_END:   wParam = SB_BOTTOM; break;
 921     case VK_UP:    wParam = SB_LINEUP; break;
 922     case VK_DOWN:  wParam = SB_LINEDOWN; break;
 923     default: return;
 924     }
 925     SendMessageW(GetParent(hwnd),
 926         ((GetWindowLongA( hwnd, GWL_STYLE ) & SBS_VERT) ?
 927             WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
 928 }
 929
 930
 931 /***********************************************************************
 932  *           SCROLL_HandleScrollEvent
 933  *
 934  * Handle a mouse or timer event for the scrollbar.
 935  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 936  * windows coordinates.
 937  */
 938 static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 939 {
 940       /* Previous mouse position for timer events */
 941     static POINT prevPt;
 942       /* Thumb position when tracking started. */
 943     static UINT trackThumbPos;
 944       /* Position in the scroll-bar of the last button-down event. */
 945     static INT lastClickPos;
 946       /* Position in the scroll-bar of the last mouse event. */
 947     static INT lastMousePos;
 948
 949     enum SCROLL_HITTEST hittest;
 950     HWND hwndOwner, hwndCtl;
 951     BOOL vertical;
 952     INT arrowSize, thumbSize, thumbPos;
 953     RECT rect;
 954     HDC hdc;
 955
 956     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 957     if (!infoPtr) return;
 958     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 959                   return;
 960
 961     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 962     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 963                                         &arrowSize, &thumbSize, &thumbPos );
 964     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 965     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 966
 967     switch(msg)
 968     {
 969       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 970           HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 971           SCROLL_trackVertical = vertical;
 972           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 973           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 974           lastMousePos  = lastClickPos;
 975           trackThumbPos = thumbPos;
 976           prevPt = pt;
 977           if (nBar == SB_CTL && (GetWindowLongA(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
 978           SetCapture( hwnd );
 979           break;
 980
 981       case WM_MOUSEMOVE:
 982           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 983           prevPt = pt;
 984           break;
 985
 986       case WM_LBUTTONUP:
 987           hittest = SCROLL_NOWHERE;
 988           ReleaseCapture();
 989           /* if scrollbar has focus, show back caret */
 990           if (hwnd==GetFocus()) ShowCaret(hwnd);
 991           break;
 992
 993       case WM_SYSTIMER:
 994           pt = prevPt;
 995           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 996           break;
 997
 998       default:
 999           return;  /* Should never happen */
1000     }
1001
1002     TRACE("Event: hwnd=%p bar=%d msg=%s pt=%ld,%ld hit=%d\n",
1003           hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
1004
1005     switch(SCROLL_trackHitTest)
1006     {
1007     case SCROLL_NOWHERE:  /* No tracking in progress */
1008         break;
1009
1010     case SCROLL_TOP_ARROW:
1011         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1012                            (hittest == SCROLL_trackHitTest), FALSE );
1013         if (hittest == SCROLL_trackHitTest)
1014         {
1015             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1016             {
1017                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1018                                 SB_LINEUP, (LPARAM)hwndCtl );
1019             }
1020
1021             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1022                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1023                             (TIMERPROC)0 );
1024         }
1025         else KillSystemTimer( hwnd, SCROLL_TIMER );
1026         break;
1027
1028     case SCROLL_TOP_RECT:
1029         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1030                              thumbPos, infoPtr->flags, vertical,
1031                              (hittest == SCROLL_trackHitTest), FALSE );
1032         if (hittest == SCROLL_trackHitTest)
1033         {
1034             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1035             {
1036                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1037                                 SB_PAGEUP, (LPARAM)hwndCtl );
1038             }
1039             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1040                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1041                               (TIMERPROC)0 );
1042         }
1043         else KillSystemTimer( hwnd, SCROLL_TIMER );
1044         break;
1045
1046     case SCROLL_THUMB:
1047         if (msg == WM_LBUTTONDOWN)
1048         {
1049             SCROLL_TrackingWin = hwnd;
1050             SCROLL_TrackingBar = nBar;
1051             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
1052             SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1053                                                         vertical,
1054                                                         SCROLL_TrackingPos );
1055             if (!SCROLL_MovingThumb)
1056                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1057         }
1058         else if (msg == WM_LBUTTONUP)
1059         {
1060             if (SCROLL_MovingThumb)
1061                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
1062             SCROLL_TrackingWin = 0;
1063             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1064                                  thumbPos, infoPtr->flags, vertical,
1065                                  FALSE, FALSE );
1066         }
1067         else  /* WM_MOUSEMOVE */
1068         {
1069             UINT pos;
1070
1071             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
1072             else
1073             {
1074                 pt = SCROLL_ClipPos( &rect, pt );
1075                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
1076             }
1077             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
1078             {
1079                 if (SCROLL_MovingThumb)
1080                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1081                                         arrowSize, thumbSize );
1082                 lastMousePos = pos;
1083                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
1084                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1085                                                          vertical,
1086                                                          SCROLL_TrackingPos );
1087                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1088                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
1089                                 (LPARAM)hwndCtl );
1090                 if (!SCROLL_MovingThumb)
1091                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1092                                         arrowSize, thumbSize );
1093             }
1094         }
1095         break;
1096
1097     case SCROLL_BOTTOM_RECT:
1098         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1099                              thumbPos, infoPtr->flags, vertical,
1100                              FALSE, (hittest == SCROLL_trackHitTest) );
1101         if (hittest == SCROLL_trackHitTest)
1102         {
1103             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1104             {
1105                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1106                                 SB_PAGEDOWN, (LPARAM)hwndCtl );
1107             }
1108             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1109                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1110                               (TIMERPROC)0 );
1111         }
1112         else KillSystemTimer( hwnd, SCROLL_TIMER );
1113         break;
1114
1115     case SCROLL_BOTTOM_ARROW:
1116         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1117                            FALSE, (hittest == SCROLL_trackHitTest) );
1118         if (hittest == SCROLL_trackHitTest)
1119         {
1120             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1121             {
1122                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1123                                 SB_LINEDOWN, (LPARAM)hwndCtl );
1124             }
1125
1126             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1127                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1128                             (TIMERPROC)0 );
1129         }
1130         else KillSystemTimer( hwnd, SCROLL_TIMER );
1131         break;
1132     }
1133
1134     if (msg == WM_LBUTTONDOWN)
1135     {
1136
1137         if (hittest == SCROLL_THUMB)
1138         {
1139             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1140                                  trackThumbPos + lastMousePos - lastClickPos );
1141             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1142                             MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
1143         }
1144     }
1145
1146     if (msg == WM_LBUTTONUP)
1147     {
1148         hittest = SCROLL_trackHitTest;
1149         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1150
1151         if (hittest == SCROLL_THUMB)
1152         {
1153             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1154                                  trackThumbPos + lastMousePos - lastClickPos );
1155             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1156                             MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
1157         }
1158         SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1159                           SB_ENDSCROLL, (LPARAM)hwndCtl );
1160     }
1161
1162     ReleaseDC( hwnd, hdc );
1163 }
1164
1165
1166 /***********************************************************************
1167  *           SCROLL_TrackScrollBar
1168  *
1169  * Track a mouse button press on a scroll-bar.
1170  * pt is in screen-coordinates for non-client scroll bars.
1171  */
1172 void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
1173 {
1174     MSG msg;
1175     INT xoffset = 0, yoffset = 0;
1176
1177     if (scrollbar != SB_CTL)
1178     {
1179         WND *wndPtr = WIN_GetPtr( hwnd );
1180         if (!wndPtr || wndPtr == WND_OTHER_PROCESS) return;
1181         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
1182         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
1183         WIN_ReleasePtr( wndPtr );
1184         ScreenToClient( hwnd, &pt );
1185         pt.x += xoffset;
1186         pt.y += yoffset;
1187     }
1188
1189     SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
1190
1191     do
1192     {
1193         if (!GetMessageW( &msg, 0, 0, 0 )) break;
1194         if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
1195         switch(msg.message)
1196         {
1197         case WM_LBUTTONUP:
1198         case WM_MOUSEMOVE:
1199         case WM_SYSTIMER:
1200             pt.x = LOWORD(msg.lParam) + xoffset;
1201             pt.y = HIWORD(msg.lParam) + yoffset;
1202             SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
1203             break;
1204         default:
1205             TranslateMessage( &msg );
1206             DispatchMessageW( &msg );
1207             break;
1208         }
1209         if (!IsWindow( hwnd ))
1210         {
1211             ReleaseCapture();
1212             break;
1213         }
1214     } while (msg.message != WM_LBUTTONUP);
1215 }
1216
1217
1218 /***********************************************************************
1219  *           SCROLL_CreateScrollBar
1220  *
1221  *  Create a scroll bar
1222  */
1223 static void SCROLL_CreateScrollBar(
1224 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1225 LPCREATESTRUCTW lpCreate /* [in] The style and place of the scroll bar */)
1226 {
1227     LPSCROLLBAR_INFO info = SCROLL_GetScrollBarInfo(hwnd, SB_CTL);
1228     if (!info) return;
1229
1230     TRACE("hwnd=%p lpCreate=%p\n", hwnd, lpCreate);
1231
1232     if (lpCreate->style & WS_DISABLED)
1233     {
1234         info->flags = ESB_DISABLE_BOTH;
1235         TRACE("Created WS_DISABLED scrollbar\n");
1236     }
1237
1238     if (lpCreate->style & SBS_VERT)
1239     {
1240         if (lpCreate->style & SBS_LEFTALIGN)
1241             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1242                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1243         else if (lpCreate->style & SBS_RIGHTALIGN)
1244             MoveWindow( hwnd,
1245                         lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1246                         lpCreate->y,
1247                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1248     }
1249     else  /* SBS_HORZ */
1250     {
1251         if (lpCreate->style & SBS_TOPALIGN)
1252             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1253                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1254         else if (lpCreate->style & SBS_BOTTOMALIGN)
1255             MoveWindow( hwnd,
1256                         lpCreate->x,
1257                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1258                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1259     }
1260 }
1261
1262
1263 /*************************************************************************
1264  *           SCROLL_GetScrollInfo
1265  *
1266  *  Internal helper for the API function
1267  */
1268 static BOOL SCROLL_GetScrollInfo(
1269 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1270 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1271 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1272 {
1273     LPSCROLLBAR_INFO infoPtr;
1274
1275     /* handle invalid data structure */
1276     if (!SCROLL_ScrollInfoValid(info)
1277         || !(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar)))
1278             return FALSE;
1279
1280     /* fill in the desired scroll info structure */
1281     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
1282     if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
1283     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1284         info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
1285     if (info->fMask & SIF_RANGE)
1286     {
1287         info->nMin = infoPtr->minVal;
1288         info->nMax = infoPtr->maxVal;
1289     }
1290
1291     return (info->fMask & SIF_ALL) != 0;
1292 }
1293
1294
1295 /*************************************************************************
1296  *           SCROLL_GetScrollPos
1297  *
1298  *  Internal helper for the API function
1299  */
1300 static INT SCROLL_GetScrollPos(
1301 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1302 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1303 {
1304     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1305     return infoPtr ? infoPtr->curVal: 0;
1306 }
1307
1308
1309 /*************************************************************************
1310  *           SCROLL_GetScrollRange
1311  *
1312  *  Internal helper for the API function
1313  *
1314  * RETURNS STD
1315  */
1316 static BOOL SCROLL_GetScrollRange(
1317 HWND hwnd, /* [in] Handle of window */
1318 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */
1319 LPINT lpMin, /* [out] Where to store minimum value */
1320 LPINT lpMax /* [out] Where to store maximum value */)
1321 {
1322     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1323
1324     if (lpMin) *lpMin = infoPtr ? infoPtr->minVal : 0;
1325     if (lpMax) *lpMax = infoPtr ? infoPtr->maxVal : 0;
1326
1327     return infoPtr ? TRUE : FALSE;
1328 }
1329
1330
1331
1332 /***********************************************************************
1333  *           ScrollBarWndProc
1334  */
1335 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
1336 {
1337     if (!IsWindow( hwnd )) return 0;
1338
1339     switch(message)
1340     {
1341     case WM_CREATE:
1342         SCROLL_CreateScrollBar(hwnd, (LPCREATESTRUCTW)lParam);
1343         if (!hUpArrow) SCROLL_LoadBitmaps();
1344         break;
1345
1346     case WM_ENABLE:
1347         {
1348             SCROLLBAR_INFO *infoPtr;
1349             if ((infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_CTL )))
1350             {
1351                 infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
1352                 SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
1353             }
1354         }
1355         return 0;
1356
1357     case WM_LBUTTONDOWN:
1358         {
1359             POINT pt;
1360             pt.x = (short)LOWORD(lParam);
1361             pt.y = (short)HIWORD(lParam);
1362             SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
1363         }
1364         break;
1365     case WM_LBUTTONUP:
1366     case WM_MOUSEMOVE:
1367     case WM_SYSTIMER:
1368         {
1369             POINT pt;
1370             pt.x = (short)LOWORD(lParam);
1371             pt.y = (short)HIWORD(lParam);
1372             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1373         }
1374         break;
1375
1376     case WM_KEYDOWN:
1377         SCROLL_HandleKbdEvent(hwnd, wParam, lParam);
1378         break;
1379
1380     case WM_KEYUP:
1381         ShowCaret(hwnd);
1382         break;
1383
1384     case WM_SETFOCUS:
1385         {
1386             /* Create a caret when a ScrollBar get focus */
1387             RECT rect;
1388             int arrowSize, thumbSize, thumbPos, vertical;
1389             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
1390                                                 &arrowSize, &thumbSize, &thumbPos );
1391             if (!vertical)
1392             {
1393                 CreateCaret(hwnd, (HBITMAP)1, thumbSize-2, rect.bottom-rect.top-2);
1394                 SetCaretPos(thumbPos+1, rect.top+1);
1395             }
1396             else
1397             {
1398                 CreateCaret(hwnd, (HBITMAP)1, rect.right-rect.left-2,thumbSize-2);
1399                 SetCaretPos(rect.top+1, thumbPos+1);
1400             }
1401             ShowCaret(hwnd);
1402         }
1403         break;
1404
1405     case WM_KILLFOCUS:
1406         {
1407             RECT rect;
1408             int arrowSize, thumbSize, thumbPos, vertical;
1409             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
1410             if (!vertical){
1411                 rect.left=thumbPos+1;
1412                 rect.right=rect.left+thumbSize;
1413             }
1414             else
1415             {
1416                 rect.top=thumbPos+1;
1417                 rect.bottom=rect.top+thumbSize;
1418             }
1419             HideCaret(hwnd);
1420             InvalidateRect(hwnd,&rect,0);
1421             DestroyCaret();
1422         }
1423         break;
1424
1425     case WM_ERASEBKGND:
1426          return 1;
1427
1428     case WM_GETDLGCODE:
1429          return DLGC_WANTARROWS; /* Windows returns this value */
1430
1431     case WM_PAINT:
1432         {
1433             PAINTSTRUCT ps;
1434             HDC hdc = wParam ? (HDC)wParam : BeginPaint(hwnd, &ps);
1435             if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEBOX)
1436             {
1437                 RECT rc;
1438                 GetClientRect( hwnd, &rc );
1439                 FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
1440             }
1441             else
1442                 SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1443             if (!wParam) EndPaint(hwnd, &ps);
1444         }
1445         break;
1446
1447     case SBM_SETPOS16:
1448     case SBM_SETPOS:
1449         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1450
1451     case SBM_GETPOS16:
1452     case SBM_GETPOS:
1453        return SCROLL_GetScrollPos(hwnd, SB_CTL);
1454
1455     case SBM_SETRANGE16:
1456         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
1457                           wParam  /* FIXME: Is this correct? */ );
1458         return 0;
1459
1460     case SBM_SETRANGE:
1461         {
1462             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1463             SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
1464             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1465         }
1466         return 0;
1467
1468     case SBM_GETRANGE16:
1469         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
1470         return 0;
1471
1472     case SBM_GETRANGE:
1473         return SCROLL_GetScrollRange(hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam);
1474
1475     case SBM_ENABLE_ARROWS16:
1476     case SBM_ENABLE_ARROWS:
1477         return EnableScrollBar( hwnd, SB_CTL, wParam );
1478
1479     case SBM_SETRANGEREDRAW:
1480         {
1481             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1482             SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
1483             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1484         }
1485         return 0;
1486
1487     case SBM_SETSCROLLINFO:
1488         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1489
1490     case SBM_GETSCROLLINFO:
1491         return SCROLL_GetScrollInfo(hwnd, SB_CTL, (SCROLLINFO *)lParam);
1492
1493     case 0x00e5:
1494     case 0x00e7:
1495     case 0x00e8:
1496     case 0x00eb:
1497     case 0x00ec:
1498     case 0x00ed:
1499     case 0x00ee:
1500     case 0x00ef:
1501         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1502                     message, wParam, lParam );
1503         break;
1504
1505     default:
1506         if (message >= WM_USER)
1507             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1508                          message, wParam, lParam );
1509         return DefWindowProcW( hwnd, message, wParam, lParam );
1510     }
1511     return 0;
1512 }
1513
1514
1515 /*************************************************************************
1516  *           SetScrollInfo   (USER32.@)
1517  * SetScrollInfo can be used to set the position, upper bound,
1518  * lower bound, and page size of a scrollbar control.
1519  *
1520  * RETURNS
1521  *    Scrollbar position
1522  *
1523  * NOTE
1524  *    For 100 lines of text to be displayed in a window of 25 lines,
1525  *  one would for instance use info->nMin=0, info->nMax=75
1526  *  (corresponding to the 76 different positions of the window on
1527  *  the text), and info->nPage=25.
1528  */
1529 INT WINAPI SetScrollInfo(
1530 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1531 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1532 const SCROLLINFO *info /* [in] Specifies what to change and new values */,
1533 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1534 {
1535     INT action;
1536     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1537
1538     if( action & SA_SSI_HIDE )
1539         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1540     else
1541     {
1542         if( action & SA_SSI_SHOW )
1543             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1544                 return retVal; /* SetWindowPos() already did the painting */
1545
1546         if( bRedraw && (action & SA_SSI_REFRESH))
1547             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1548         else if( action & SA_SSI_REPAINT_ARROWS )
1549             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1550     }
1551     return retVal;
1552 }
1553
1554 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1555                             const SCROLLINFO *info, INT *action  )
1556 {
1557     /* Update the scrollbar state and set action flags according to
1558      * what has to be done graphics wise. */
1559
1560     SCROLLBAR_INFO *infoPtr;
1561     UINT new_flags;
1562     BOOL bChangeParams = FALSE; /* don't show/hide scrollbar if params don't change */
1563
1564    *action = 0;
1565
1566     if (!(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar))) return 0;
1567     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1568     if ((info->cbSize != sizeof(*info)) &&
1569         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1570
1571     if (TRACE_ON(scroll))
1572     {
1573         TRACE("hwnd=%p bar=%d", hwnd, nBar);
1574         if (info->fMask & SIF_PAGE) TRACE( " page=%d", info->nPage );
1575         if (info->fMask & SIF_POS) TRACE( " pos=%d", info->nPos );
1576         if (info->fMask & SIF_RANGE) TRACE( " min=%d max=%d", info->nMin, info->nMax );
1577         TRACE("\n");
1578     }
1579
1580     /* Set the page size */
1581
1582     if (info->fMask & SIF_PAGE)
1583     {
1584         if( infoPtr->page != info->nPage )
1585         {
1586             infoPtr->page = info->nPage;
1587            *action |= SA_SSI_REFRESH;
1588            bChangeParams = TRUE;
1589         }
1590     }
1591
1592     /* Set the scroll pos */
1593
1594     if (info->fMask & SIF_POS)
1595     {
1596         if( infoPtr->curVal != info->nPos )
1597         {
1598             infoPtr->curVal = info->nPos;
1599            *action |= SA_SSI_REFRESH;
1600         }
1601     }
1602
1603     /* Set the scroll range */
1604
1605     if (info->fMask & SIF_RANGE)
1606     {
1607         /* Invalid range -> range is set to (0,0) */
1608         if ((info->nMin > info->nMax) ||
1609             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1610         {
1611             infoPtr->minVal = 0;
1612             infoPtr->maxVal = 0;
1613             bChangeParams = TRUE;
1614         }
1615         else
1616         {
1617             if( infoPtr->minVal != info->nMin ||
1618                 infoPtr->maxVal != info->nMax )
1619             {
1620                 *action |= SA_SSI_REFRESH;
1621                 infoPtr->minVal = info->nMin;
1622                 infoPtr->maxVal = info->nMax;
1623                 bChangeParams = TRUE;
1624             }
1625         }
1626     }
1627
1628     /* Make sure the page size is valid */
1629
1630     if (infoPtr->page < 0) infoPtr->page = 0;
1631     else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
1632         infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
1633
1634     /* Make sure the pos is inside the range */
1635
1636     if (infoPtr->curVal < infoPtr->minVal)
1637         infoPtr->curVal = infoPtr->minVal;
1638     else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1639         infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
1640
1641     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1642                  infoPtr->page, infoPtr->curVal,
1643                  infoPtr->minVal, infoPtr->maxVal );
1644
1645     /* don't change the scrollbar state if SetScrollInfo
1646      * is just called with SIF_DISABLENOSCROLL
1647      */
1648     if(!(info->fMask & SIF_ALL)) goto done;
1649
1650     /* Check if the scrollbar should be hidden or disabled */
1651
1652     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1653     {
1654         new_flags = infoPtr->flags;
1655         if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1656         {
1657             /* Hide or disable scroll-bar */
1658             if (info->fMask & SIF_DISABLENOSCROLL)
1659             {
1660                 new_flags = ESB_DISABLE_BOTH;
1661                *action |= SA_SSI_REFRESH;
1662             }
1663             else if ((nBar != SB_CTL) && bChangeParams)
1664             {
1665                 *action = SA_SSI_HIDE;
1666                 goto done;
1667             }
1668         }
1669         else  /* Show and enable scroll-bar */
1670         {
1671             new_flags = 0;
1672             if ((nBar != SB_CTL) && bChangeParams)
1673                 *action |= SA_SSI_SHOW;
1674         }
1675
1676         if (infoPtr->flags != new_flags) /* check arrow flags */
1677         {
1678             infoPtr->flags = new_flags;
1679            *action |= SA_SSI_REPAINT_ARROWS;
1680         }
1681     }
1682
1683 done:
1684     /* Return current position */
1685
1686     return infoPtr->curVal;
1687 }
1688
1689
1690 /*************************************************************************
1691  *           GetScrollInfo   (USER32.@)
1692  *
1693  * GetScrollInfo can be used to retrieve the position, upper bound,
1694  * lower bound, and page size of a scrollbar control.
1695  *
1696  * RETURNS STD
1697  */
1698 BOOL WINAPI GetScrollInfo(
1699 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1700 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1701 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1702 {
1703     TRACE("hwnd=%p nBar=%d info=%p\n", hwnd, nBar, info);
1704
1705     /* Refer SB_CTL requests to the window */
1706     if (nBar == SB_CTL)
1707         return SendMessageA(hwnd, SBM_GETSCROLLINFO, (WPARAM)0, (LPARAM)info);
1708     else
1709         return SCROLL_GetScrollInfo(hwnd, nBar, info);
1710 }
1711
1712
1713 /*************************************************************************
1714  *           SetScrollPos   (USER32.@)
1715  *
1716  * RETURNS
1717  *    Success: Scrollbar position
1718  *    Failure: 0
1719  *
1720  * REMARKS
1721  *    Note the ambiguity when 0 is returned.  Use GetLastError
1722  *    to make sure there was an error (and to know which one).
1723  */
1724 INT WINAPI SetScrollPos(
1725 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1726 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1727 INT nPos /* [in] New value */,
1728 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */ )
1729 {
1730     SCROLLINFO info;
1731     SCROLLBAR_INFO *infoPtr;
1732     INT oldPos;
1733
1734     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return 0;
1735     oldPos      = infoPtr->curVal;
1736     info.cbSize = sizeof(info);
1737     info.nPos   = nPos;
1738     info.fMask  = SIF_POS;
1739     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1740     return oldPos;
1741 }
1742
1743
1744 /*************************************************************************
1745  *           GetScrollPos   (USER32.@)
1746  *
1747  * RETURNS
1748  *    Success: Current position
1749  *    Failure: 0
1750  *
1751  * REMARKS
1752  *    There is ambiguity when 0 is returned.  Use GetLastError
1753  *    to make sure there was an error (and to know which one).
1754  */
1755 INT WINAPI GetScrollPos(
1756 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1757 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1758 {
1759     TRACE("hwnd=%p nBar=%d\n", hwnd, nBar);
1760
1761     /* Refer SB_CTL requests to the window */
1762     if (nBar == SB_CTL)
1763         return SendMessageA(hwnd, SBM_GETPOS, (WPARAM)0, (LPARAM)0);
1764     else
1765         return SCROLL_GetScrollPos(hwnd, nBar);
1766 }
1767
1768
1769 /*************************************************************************
1770  *           SetScrollRange   (USER32.@)
1771  *
1772  * RETURNS STD
1773  */
1774 BOOL WINAPI SetScrollRange(
1775 HWND hwnd, /* [in] Handle of window whose scrollbar will be affected */
1776 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */
1777 INT minVal, /* [in] New minimum value */
1778 INT maxVal, /* [in] New maximum value */
1779 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1780 {
1781     SCROLLINFO info;
1782
1783     info.cbSize = sizeof(info);
1784     info.nMin   = minVal;
1785     info.nMax   = maxVal;
1786     info.fMask  = SIF_RANGE;
1787     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1788     return TRUE;
1789 }
1790
1791
1792 /*************************************************************************
1793  *           SCROLL_SetNCSbState
1794  *
1795  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1796  */
1797 INT SCROLL_SetNCSbState(HWND hwnd, int vMin, int vMax, int vPos,
1798                         int hMin, int hMax, int hPos)
1799 {
1800     INT vA, hA;
1801     SCROLLINFO vInfo, hInfo;
1802
1803     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1804     vInfo.nMin   = vMin;
1805     vInfo.nMax   = vMax;
1806     vInfo.nPos   = vPos;
1807     hInfo.nMin   = hMin;
1808     hInfo.nMax   = hMax;
1809     hInfo.nPos   = hPos;
1810     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1811
1812     SCROLL_SetScrollInfo( hwnd, SB_VERT, &vInfo, &vA );
1813     SCROLL_SetScrollInfo( hwnd, SB_HORZ, &hInfo, &hA );
1814
1815     if( !SCROLL_ShowScrollBar( hwnd, SB_BOTH,
1816                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1817     {
1818         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1819         if( vA & SA_SSI_REFRESH )
1820             SCROLL_RefreshScrollBar( hwnd, SB_VERT, FALSE, TRUE );
1821
1822         if( hA & SA_SSI_REFRESH )
1823             SCROLL_RefreshScrollBar( hwnd, SB_HORZ, FALSE, TRUE );
1824     }
1825     return 0;
1826 }
1827
1828
1829 /*************************************************************************
1830  *           GetScrollRange   (USER32.@)
1831  *
1832  * RETURNS STD
1833  */
1834 BOOL WINAPI GetScrollRange(
1835 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1836 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */,
1837 LPINT lpMin /* [out] Where to store minimum value */,
1838 LPINT lpMax /* [out] Where to store maximum value */)
1839 {
1840     TRACE("hwnd=%p nBar=%d lpMin=%p lpMax=%p\n", hwnd, nBar, lpMin, lpMax);
1841
1842     /* Refer SB_CTL requests to the window */
1843     if (nBar == SB_CTL)
1844         return SendMessageA(hwnd, SBM_GETRANGE, (WPARAM)lpMin, (LPARAM)lpMax);
1845     else
1846         return SCROLL_GetScrollRange(hwnd, nBar, lpMin, lpMax);
1847 }
1848
1849
1850 /*************************************************************************
1851  *           SCROLL_ShowScrollBar()
1852  *
1853  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1854  */
1855 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1856                              BOOL fShowH, BOOL fShowV )
1857 {
1858     LONG style = GetWindowLongW( hwnd, GWL_STYLE );
1859
1860     TRACE("hwnd=%p bar=%d horz=%d, vert=%d\n", hwnd, nBar, fShowH, fShowV );
1861
1862     switch(nBar)
1863     {
1864     case SB_CTL:
1865         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1866         return TRUE;
1867
1868     case SB_BOTH:
1869     case SB_HORZ:
1870         if (fShowH)
1871         {
1872             fShowH = !(style & WS_HSCROLL);
1873             style |= WS_HSCROLL;
1874         }
1875         else  /* hide it */
1876         {
1877             fShowH = (style & WS_HSCROLL);
1878             style &= ~WS_HSCROLL;
1879         }
1880         if( nBar == SB_HORZ ) {
1881             fShowV = FALSE;
1882             break;
1883         }
1884         /* fall through */
1885
1886     case SB_VERT:
1887         if (fShowV)
1888         {
1889             fShowV = !(style & WS_VSCROLL);
1890             style |= WS_VSCROLL;
1891         }
1892         else  /* hide it */
1893         {
1894             fShowV = (style & WS_VSCROLL);
1895             style &= ~WS_VSCROLL;
1896         }
1897         if ( nBar == SB_VERT )
1898            fShowH = FALSE;
1899         break;
1900
1901     default:
1902         return FALSE;  /* Nothing to do! */
1903     }
1904
1905     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1906     {
1907         WIN_SetStyle( hwnd, style );
1908         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1909                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1910         return TRUE;
1911     }
1912     return FALSE; /* no frame changes */
1913 }
1914
1915
1916 /*************************************************************************
1917  *           ShowScrollBar   (USER32.@)
1918  *
1919  * RETURNS STD
1920  */
1921 BOOL WINAPI ShowScrollBar(
1922 HWND hwnd, /* [in] Handle of window whose scrollbar(s) will be affected   */
1923 INT nBar, /* [in] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1924 BOOL fShow /* [in] TRUE = show, FALSE = hide  */)
1925 {
1926     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1927                                       (nBar == SB_HORZ) ? 0 : fShow );
1928     return TRUE;
1929 }
1930
1931
1932 /*************************************************************************
1933  *           EnableScrollBar   (USER32.@)
1934  */
1935 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1936 {
1937     BOOL bFineWithMe;
1938     SCROLLBAR_INFO *infoPtr;
1939
1940     TRACE("%p %d %d\n", hwnd, nBar, flags );
1941
1942     flags &= ESB_DISABLE_BOTH;
1943
1944     if (nBar == SB_BOTH)
1945     {
1946         if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_VERT ))) return FALSE;
1947         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1948         {
1949             infoPtr->flags = flags;
1950             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1951         }
1952         nBar = SB_HORZ;
1953     }
1954     else
1955         bFineWithMe = TRUE;
1956
1957     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return FALSE;
1958     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1959     infoPtr->flags = flags;
1960
1961     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1962     return TRUE;
1963 }