git.oblomov.eu Git - wine/blob - dlls/user/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  * NOTES
  22  *
  23  * This code was audited for completeness against the documented features
  24  * of Comctl32.dll version 6.0 on Oct. 8, 2004, by Dimitrie O. Paun.
  25  *
  26  * Unless otherwise noted, we believe this code to be complete, as per
  27  * the specification mentioned above.
  28  * If you discover missing features, or bugs, please note them below.
  29  *
  30  * TODO:
  31  *   - GetScrollBarInfo
  32  *   - SBM_GETSCROLLBARINFO
  33  *   - SCROLLBARINFO
  34  */
  35
  36 #include <stdarg.h>
  37
  38 #include "windef.h"
  39 #include "winbase.h"
  40 #include "wingdi.h"
  41 #include "wine/winuser16.h"
  42 #include "controls.h"
  43 #include "win.h"
  44 #include "wine/debug.h"
  45 #include "user_private.h"
  46 #include "message.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
  49
  50 typedef struct
  51 {
  52     INT   curVal;   /* Current scroll-bar value */
  53     INT   minVal;   /* Minimum scroll-bar value */
  54     INT   maxVal;   /* Maximum scroll-bar value */
  55     INT   page;     /* Page size of scroll bar (Win32) */
  56     UINT  flags;    /* EnableScrollBar flags */
  57 } SCROLLBAR_INFO, *LPSCROLLBAR_INFO;
  58
  59
  60   /* Minimum size of the rectangle between the arrows */
  61 #define SCROLL_MIN_RECT  4
  62
  63   /* Minimum size of the thumb in pixels */
  64 #define SCROLL_MIN_THUMB 6
  65
  66   /* Overlap between arrows and thumb */
  67 #define SCROLL_ARROW_THUMB_OVERLAP 0
  68
  69   /* Delay (in ms) before first repetition when holding the button down */
  70 #define SCROLL_FIRST_DELAY   200
  71
  72   /* Delay (in ms) between scroll repetitions */
  73 #define SCROLL_REPEAT_DELAY  50
  74
  75   /* Scroll timer id */
  76 #define SCROLL_TIMER   0
  77
  78   /* Scroll-bar hit testing */
  79 enum SCROLL_HITTEST
  80 {
  81     SCROLL_NOWHERE,      /* Outside the scroll bar */
  82     SCROLL_TOP_ARROW,    /* Top or left arrow */
  83     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  84     SCROLL_THUMB,        /* Thumb rectangle */
  85     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  86     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  87 };
  88
  89  /* What to do after SCROLL_SetScrollInfo() */
  90 #define SA_SSI_HIDE             0x0001
  91 #define SA_SSI_SHOW             0x0002
  92 #define SA_SSI_REFRESH          0x0004
  93 #define SA_SSI_REPAINT_ARROWS   0x0008
  94
  95  /* Thumb-tracking info */
  96 static HWND SCROLL_TrackingWin = 0;
  97 static INT  SCROLL_TrackingBar = 0;
  98 static INT  SCROLL_TrackingPos = 0;
  99 static INT  SCROLL_TrackingVal = 0;
 100  /* Hit test code of the last button-down event */
 101 static enum SCROLL_HITTEST SCROLL_trackHitTest;
 102 static BOOL SCROLL_trackVertical;
 103
 104  /* Is the moving thumb being displayed? */
 105 static BOOL SCROLL_MovingThumb = FALSE;
 106
 107  /* Local functions */
 108 static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
 109                                     BOOL fShowH, BOOL fShowV );
 110 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
 111                                  const SCROLLINFO *info, BOOL bRedraw );
 112 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 113                                     RECT *rect, INT arrowSize,
 114                                     INT thumbSize, INT thumbPos,
 115                                     UINT flags, BOOL vertical,
 116                                     BOOL top_selected, BOOL bottom_selected );
 117 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
 118
 119
 120 /*********************************************************************
 121  * scrollbar class descriptor
 122  */
 123 const struct builtin_class_descr SCROLL_builtin_class =
 124 {
 125     "ScrollBar",            /* name */
 126     CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
 127     NULL,                   /* procA (winproc is Unicode only) */
 128     ScrollBarWndProc,       /* procW */
 129     sizeof(SCROLLBAR_INFO), /* extra */
 130     IDC_ARROW,              /* cursor */
 131     0                       /* brush */
 132 };
 133
 134 /***********************************************************************
 135  *           SCROLL_ScrollInfoValid
 136  *
 137  *  Determine if the supplied SCROLLINFO struct is valid.
 138  */
 139 inline static BOOL SCROLL_ScrollInfoValid(
 140 LPSCROLLINFO info /* [in] The SCROLLINFO struct to be tested */)
 141 {
 142     return !(info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)
 143         || (info->cbSize != sizeof(*info)
 144             && info->cbSize != sizeof(*info) - sizeof(info->nTrackPos)));
 145 }
 146
 147
 148 /***********************************************************************
 149  *           SCROLL_GetScrollBarInfo
 150  */
 151 static SCROLLBAR_INFO *SCROLL_GetScrollBarInfo( HWND hwnd, INT nBar )
 152 {
 153     SCROLLBAR_INFO *infoPtr;
 154     WND *wndPtr = WIN_FindWndPtr( hwnd );
 155
 156     if (!wndPtr) return NULL;
 157     switch(nBar)
 158     {
 159         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 160         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 161         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 162         default:
 163             WIN_ReleaseWndPtr( wndPtr );
 164             return NULL;
 165     }
 166
 167     if (!infoPtr)  /* Create the info structure if needed */
 168     {
 169         if ((infoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(SCROLLBAR_INFO) )))
 170         {
 171             infoPtr->minVal = infoPtr->curVal = infoPtr->page = 0;
 172             infoPtr->maxVal = 100;
 173             infoPtr->flags  = ESB_ENABLE_BOTH;
 174             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 175             else wndPtr->pVScroll = infoPtr;
 176         }
 177     }
 178     WIN_ReleaseWndPtr( wndPtr );
 179     return infoPtr;
 180 }
 181
 182
 183 /***********************************************************************
 184  *           SCROLL_GetScrollBarRect
 185  *
 186  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 187  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 188  * 'arrowSize' returns the width or height of an arrow (depending on
 189  * the orientation of the scrollbar), 'thumbSize' returns the size of
 190  * the thumb, and 'thumbPos' returns the position of the thumb
 191  * relative to the left or to the top.
 192  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 193  */
 194 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 195                                      INT *arrowSize, INT *thumbSize,
 196                                      INT *thumbPos )
 197 {
 198     INT pixels;
 199     BOOL vertical;
 200     WND *wndPtr = WIN_FindWndPtr( hwnd );
 201
 202     switch(nBar)
 203     {
 204       case SB_HORZ:
 205         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 206         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 207         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 208         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 209         if(wndPtr->dwStyle & WS_BORDER) {
 210           lprect->left--;
 211           lprect->right++;
 212         } else if(wndPtr->dwStyle & WS_VSCROLL)
 213           lprect->right++;
 214         vertical = FALSE;
 215         break;
 216
 217       case SB_VERT:
 218         if((wndPtr->dwExStyle & WS_EX_LEFTSCROLLBAR) != 0)
 219             lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - GetSystemMetrics(SM_CXVSCROLL);
 220         else
 221             lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 222         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 223         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 224         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 225         if(wndPtr->dwStyle & WS_BORDER) {
 226           lprect->top--;
 227           lprect->bottom++;
 228         } else if(wndPtr->dwStyle & WS_HSCROLL)
 229           lprect->bottom++;
 230         vertical = TRUE;
 231         break;
 232
 233       case SB_CTL:
 234         GetClientRect( hwnd, lprect );
 235         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 236         break;
 237
 238     default:
 239         WIN_ReleaseWndPtr(wndPtr);
 240         return FALSE;
 241     }
 242
 243     if (vertical) pixels = lprect->bottom - lprect->top;
 244     else pixels = lprect->right - lprect->left;
 245
 246     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 247     {
 248         if (pixels > SCROLL_MIN_RECT)
 249             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 250         else
 251             *arrowSize = 0;
 252         *thumbPos = *thumbSize = 0;
 253     }
 254     else
 255     {
 256         SCROLLBAR_INFO *info = SCROLL_GetScrollBarInfo( hwnd, nBar );
 257
 258         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 259         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 260
 261         if (info->page)
 262         {
 263             *thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
 264             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 265         }
 266         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 267
 268         if (((pixels -= *thumbSize ) < 0) ||
 269             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 270         {
 271             /* Rectangle too small or scrollbar disabled -> no thumb */
 272             *thumbPos = *thumbSize = 0;
 273         }
 274         else
 275         {
 276             INT max = info->maxVal - max( info->page-1, 0 );
 277             if (info->minVal >= max)
 278                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 279             else
 280                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 281                   + MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
 282         }
 283     }
 284     WIN_ReleaseWndPtr(wndPtr);
 285     return vertical;
 286 }
 287
 288
 289 /***********************************************************************
 290  *           SCROLL_GetThumbVal
 291  *
 292  * Compute the current scroll position based on the thumb position in pixels
 293  * from the top of the scroll-bar.
 294  */
 295 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 296                                   BOOL vertical, INT pos )
 297 {
 298     INT thumbSize;
 299     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 300
 301     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 302         return infoPtr->minVal;
 303
 304     if (infoPtr->page)
 305     {
 306         thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
 307         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 308     }
 309     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 310
 311     if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
 312
 313     pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 314     if (pos > pixels) pos = pixels;
 315
 316     if (!infoPtr->page) pos *= infoPtr->maxVal - infoPtr->minVal;
 317     else pos *= infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
 318     return infoPtr->minVal + ((pos + pixels / 2) / pixels);
 319 }
 320
 321 /***********************************************************************
 322  *           SCROLL_PtInRectEx
 323  */
 324 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 325 {
 326     RECT rect = *lpRect;
 327
 328     if (vertical)
 329     {
 330         rect.left -= lpRect->right - lpRect->left;
 331         rect.right += lpRect->right - lpRect->left;
 332     }
 333     else
 334     {
 335         rect.top -= lpRect->bottom - lpRect->top;
 336         rect.bottom += lpRect->bottom - lpRect->top;
 337     }
 338     return PtInRect( &rect, pt );
 339 }
 340
 341 /***********************************************************************
 342  *           SCROLL_ClipPos
 343  */
 344 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 345 {
 346     if( pt.x < lpRect->left )
 347         pt.x = lpRect->left;
 348     else
 349     if( pt.x > lpRect->right )
 350         pt.x = lpRect->right;
 351
 352     if( pt.y < lpRect->top )
 353         pt.y = lpRect->top;
 354     else
 355     if( pt.y > lpRect->bottom )
 356         pt.y = lpRect->bottom;
 357
 358     return pt;
 359 }
 360
 361
 362 /***********************************************************************
 363  *           SCROLL_HitTest
 364  *
 365  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 366  */
 367 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 368                                            POINT pt, BOOL bDragging )
 369 {
 370     INT arrowSize, thumbSize, thumbPos;
 371     RECT rect;
 372
 373     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 374                                            &arrowSize, &thumbSize, &thumbPos );
 375
 376     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 377          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 378
 379     if (vertical)
 380     {
 381         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 382         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 383         if (!thumbPos) return SCROLL_TOP_RECT;
 384         pt.y -= rect.top;
 385         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 386         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 387     }
 388     else  /* horizontal */
 389     {
 390         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 391         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 392         if (!thumbPos) return SCROLL_TOP_RECT;
 393         pt.x -= rect.left;
 394         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 395         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 396     }
 397     return SCROLL_THUMB;
 398 }
 399
 400
 401 /***********************************************************************
 402  *           SCROLL_DrawArrows
 403  *
 404  * Draw the scroll bar arrows.
 405  */
 406 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 407                                RECT *rect, INT arrowSize, BOOL vertical,
 408                                BOOL top_pressed, BOOL bottom_pressed )
 409 {
 410   RECT r;
 411
 412   r = *rect;
 413   if( vertical )
 414     r.bottom = r.top + arrowSize;
 415   else
 416     r.right = r.left + arrowSize;
 417
 418   DrawFrameControl( hdc, &r, DFC_SCROLL,
 419                     (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
 420                     | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 421                     | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );
 422
 423   r = *rect;
 424   if( vertical )
 425     r.top = r.bottom-arrowSize;
 426   else
 427     r.left = r.right-arrowSize;
 428
 429   DrawFrameControl( hdc, &r, DFC_SCROLL,
 430                     (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
 431                     | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 432                     | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
 433 }
 434
 435 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 436                                     INT arrowSize, INT thumbSize )
 437 {
 438   INT pos = SCROLL_TrackingPos;
 439   INT max_size;
 440
 441   if( vertical )
 442     max_size = rect->bottom - rect->top;
 443   else
 444     max_size = rect->right - rect->left;
 445
 446   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 447
 448   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 449     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 450   else if( pos > max_size )
 451     pos = max_size;
 452
 453   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 454                           rect, arrowSize, thumbSize, pos,
 455                           0, vertical, FALSE, FALSE );
 456
 457   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 458 }
 459
 460 /***********************************************************************
 461  *           SCROLL_DrawInterior
 462  *
 463  * Draw the scroll bar interior (everything except the arrows).
 464  */
 465 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 466                                     RECT *rect, INT arrowSize,
 467                                     INT thumbSize, INT thumbPos,
 468                                     UINT flags, BOOL vertical,
 469                                     BOOL top_selected, BOOL bottom_selected )
 470 {
 471     RECT r;
 472     HPEN hSavePen;
 473     HBRUSH hSaveBrush,hBrush;
 474
 475     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 476      * The window-owned scrollbars need to call DEFWND_ControlColor
 477      * to correctly setup default scrollbar colors
 478      */
 479     if (nBar == SB_CTL)
 480     {
 481       hBrush = (HBRUSH)SendMessageW( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 482                                      (WPARAM)hdc,(LPARAM)hwnd);
 483     }
 484     else
 485     {
 486       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 487     }
 488
 489     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 490     hSaveBrush = SelectObject( hdc, hBrush );
 491
 492     /* Calculate the scroll rectangle */
 493     r = *rect;
 494     if (vertical)
 495     {
 496         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 497         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 498     }
 499     else
 500     {
 501         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 502         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 503     }
 504
 505     /* Draw the scroll rectangles and thumb */
 506     if (!thumbPos)  /* No thumb to draw */
 507     {
 508         PatBlt( hdc, r.left, r.top,
 509                      r.right - r.left, r.bottom - r.top,
 510                      PATCOPY );
 511
 512         /* cleanup and return */
 513         SelectObject( hdc, hSavePen );
 514         SelectObject( hdc, hSaveBrush );
 515         return;
 516     }
 517
 518     if (vertical)
 519     {
 520         PatBlt( hdc, r.left, r.top,
 521                   r.right - r.left,
 522                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 523                   top_selected ? 0x0f0000 : PATCOPY );
 524         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 525         PatBlt( hdc, r.left, r.top + thumbSize,
 526                   r.right - r.left,
 527                   r.bottom - r.top - thumbSize,
 528                   bottom_selected ? 0x0f0000 : PATCOPY );
 529         r.bottom = r.top + thumbSize;
 530     }
 531     else  /* horizontal */
 532     {
 533         PatBlt( hdc, r.left, r.top,
 534                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 535                   r.bottom - r.top,
 536                   top_selected ? 0x0f0000 : PATCOPY );
 537         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 538         PatBlt( hdc, r.left + thumbSize, r.top,
 539                   r.right - r.left - thumbSize,
 540                   r.bottom - r.top,
 541                   bottom_selected ? 0x0f0000 : PATCOPY );
 542         r.right = r.left + thumbSize;
 543     }
 544
 545     /* Draw the thumb */
 546     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 547
 548     /* cleanup */
 549     SelectObject( hdc, hSavePen );
 550     SelectObject( hdc, hSaveBrush );
 551 }
 552
 553
 554 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 555                                  RECT *rect, INT arrowSize,
 556                                  INT thumbSize, INT thumbPos,
 557                                  UINT flags, BOOL vertical,
 558                                  BOOL top_selected, BOOL bottom_selected )
 559 {
 560     RECT r;
 561     HPEN hSavePen;
 562     HBRUSH hSaveBrush,hBrush;
 563     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 564
 565     if (Save_SCROLL_MovingThumb &&
 566         (SCROLL_TrackingWin == hwnd) &&
 567         (SCROLL_TrackingBar == nBar))
 568         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 569
 570       /* Select the correct brush and pen */
 571
 572     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 573      * The window-owned scrollbars need to call DEFWND_ControlColor
 574      * to correctly setup default scrollbar colors
 575      */
 576     if (nBar == SB_CTL) {
 577         hBrush = (HBRUSH)SendMessageW( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 578                                        (WPARAM)hdc,(LPARAM)hwnd);
 579     } else {
 580         hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 581     }
 582     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 583     hSaveBrush = SelectObject( hdc, hBrush );
 584
 585       /* Calculate the scroll rectangle */
 586
 587     r = *rect;
 588     if (vertical)
 589     {
 590         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 591         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 592     }
 593     else
 594     {
 595         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 596         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 597     }
 598
 599       /* Draw the scroll bar frame */
 600
 601       /* Draw the scroll rectangles and thumb */
 602
 603     if (!thumbPos)  /* No thumb to draw */
 604     {
 605         PatBlt( hdc, r.left, r.top, r.right - r.left, r.bottom - r.top, PATCOPY );
 606
 607         /* cleanup and return */
 608         SelectObject( hdc, hSavePen );
 609         SelectObject( hdc, hSaveBrush );
 610         return;
 611     }
 612
 613     if (vertical)
 614     {
 615         PatBlt( hdc, r.left, r.top, r.right - r.left,
 616                 thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 617                 top_selected ? 0x0f0000 : PATCOPY );
 618         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 619         PatBlt( hdc, r.left, r.top + thumbSize, r.right - r.left,
 620                 r.bottom - r.top - thumbSize,
 621                 bottom_selected ? 0x0f0000 : PATCOPY );
 622         r.bottom = r.top + thumbSize;
 623     }
 624     else  /* horizontal */
 625     {
 626         PatBlt( hdc, r.left, r.top,
 627                 thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 628                 r.bottom - r.top, top_selected ? 0x0f0000 : PATCOPY );
 629         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 630         PatBlt( hdc, r.left + thumbSize, r.top, r.right - r.left - thumbSize,
 631                 r.bottom - r.top, bottom_selected ? 0x0f0000 : PATCOPY );
 632         r.right = r.left + thumbSize;
 633     }
 634
 635       /* Draw the thumb */
 636
 637     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 638     Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 639     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 640
 641     if (Save_SCROLL_MovingThumb &&
 642         (SCROLL_TrackingWin == hwnd) &&
 643         (SCROLL_TrackingBar == nBar))
 644         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 645
 646     /* cleanup */
 647     SelectObject( hdc, hSavePen );
 648     SelectObject( hdc, hSaveBrush );
 649 }
 650
 651
 652 /***********************************************************************
 653  *           SCROLL_DrawScrollBar
 654  *
 655  * Redraw the whole scrollbar.
 656  */
 657 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 658                            BOOL arrows, BOOL interior )
 659 {
 660     INT arrowSize, thumbSize, thumbPos;
 661     RECT rect;
 662     BOOL vertical;
 663     WND *wndPtr = WIN_FindWndPtr( hwnd );
 664     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 665     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 666
 667     if (!wndPtr || !infoPtr ||
 668         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 669         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 670     if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
 671     hwnd = wndPtr->hwndSelf;  /* make it a full handle */
 672
 673     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 674                                         &arrowSize, &thumbSize, &thumbPos );
 675
 676     /* do not draw if the scrollbar rectangle is empty */
 677     if(IsRectEmpty(&rect))
 678       goto END;
 679
 680     if (Save_SCROLL_MovingThumb &&
 681         (SCROLL_TrackingWin == hwnd) &&
 682         (SCROLL_TrackingBar == nBar))
 683         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 684
 685       /* Draw the arrows */
 686
 687     if (arrows && arrowSize)
 688     {
 689         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 690             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 691                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 692                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 693         else
 694             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 695                                                                FALSE, FALSE );
 696     }
 697     if( interior )
 698         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 699                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 700
 701     if (Save_SCROLL_MovingThumb &&
 702         (SCROLL_TrackingWin == hwnd) &&
 703         (SCROLL_TrackingBar == nBar))
 704         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 705
 706     /* if scroll bar has focus, reposition the caret */
 707     if(hwnd==GetFocus() && (nBar==SB_CTL))
 708     {
 709         if (!vertical)
 710         {
 711             SetCaretPos(thumbPos+1, rect.top+1);
 712         }
 713         else
 714         {
 715             SetCaretPos(rect.top+1, thumbPos+1);
 716         }
 717     }
 718
 719 END:
 720     WIN_ReleaseWndPtr(wndPtr);
 721 }
 722
 723 /***********************************************************************
 724  *           SCROLL_DrawSizeGrip
 725  *
 726  *  Draw the size grip.
 727  */
 728 static void SCROLL_DrawSizeGrip( HWND hwnd,  HDC hdc)
 729 {
 730     RECT rc;
 731
 732     GetClientRect( hwnd, &rc );
 733     FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
 734     rc.left = max( rc.left, rc.right - GetSystemMetrics(SM_CXVSCROLL) - 1 );
 735     rc.top  = max( rc.top, rc.bottom - GetSystemMetrics(SM_CYHSCROLL) - 1 );
 736     DrawFrameControl( hdc, &rc, DFC_SCROLL, DFCS_SCROLLSIZEGRIP );
 737 }
 738
 739
 740 /***********************************************************************
 741  *           SCROLL_RefreshScrollBar
 742  *
 743  * Repaint the scroll bar interior after a SetScrollRange() or
 744  * SetScrollPos() call.
 745  */
 746 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 747                                      BOOL arrows, BOOL interior )
 748 {
 749     HDC hdc = GetDCEx( hwnd, 0,
 750                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 751     if (!hdc) return;
 752
 753     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 754     ReleaseDC( hwnd, hdc );
 755 }
 756
 757
 758 /***********************************************************************
 759  *           SCROLL_HandleKbdEvent
 760  *
 761  * Handle a keyboard event (only for SB_CTL scrollbars with focus).
 762  *
 763  * PARAMS
 764  *    hwnd   [I] Handle of window with scrollbar(s)
 765  *    wParam [I] Variable input including enable state
 766  *    lParam [I] Variable input including input point
 767  */
 768 static void SCROLL_HandleKbdEvent(HWND hwnd, WPARAM wParam, LPARAM lParam)
 769 {
 770     TRACE("hwnd=%p wParam=%d lParam=%ld\n", hwnd, wParam, lParam);
 771
 772     /* hide caret on first KEYDOWN to prevent flicker */
 773     if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
 774         HideCaret(hwnd);
 775
 776     switch(wParam)
 777     {
 778     case VK_PRIOR: wParam = SB_PAGEUP; break;
 779     case VK_NEXT:  wParam = SB_PAGEDOWN; break;
 780     case VK_HOME:  wParam = SB_TOP; break;
 781     case VK_END:   wParam = SB_BOTTOM; break;
 782     case VK_UP:    wParam = SB_LINEUP; break;
 783     case VK_DOWN:  wParam = SB_LINEDOWN; break;
 784     default: return;
 785     }
 786     SendMessageW(GetParent(hwnd),
 787         ((GetWindowLongW( hwnd, GWL_STYLE ) & SBS_VERT) ?
 788             WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
 789 }
 790
 791
 792 /***********************************************************************
 793  *           SCROLL_HandleScrollEvent
 794  *
 795  * Handle a mouse or timer event for the scrollbar.
 796  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 797  * windows coordinates.
 798  */
 799 static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 800 {
 801       /* Previous mouse position for timer events */
 802     static POINT prevPt;
 803       /* Thumb position when tracking started. */
 804     static UINT trackThumbPos;
 805       /* Position in the scroll-bar of the last button-down event. */
 806     static INT lastClickPos;
 807       /* Position in the scroll-bar of the last mouse event. */
 808     static INT lastMousePos;
 809
 810     enum SCROLL_HITTEST hittest;
 811     HWND hwndOwner, hwndCtl;
 812     BOOL vertical;
 813     INT arrowSize, thumbSize, thumbPos;
 814     RECT rect;
 815     HDC hdc;
 816
 817     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 818     if (!infoPtr) return;
 819     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 820                   return;
 821
 822     if (nBar == SB_CTL && (GetWindowLongW( hwnd, GWL_STYLE ) & (SBS_SIZEGRIP | SBS_SIZEBOX)))
 823     {
 824         switch(msg)
 825         {
 826             case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 827                 HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 828                 SetCapture( hwnd );
 829                 prevPt = pt;
 830                 SCROLL_trackHitTest  = hittest = SCROLL_THUMB;
 831                 break;
 832             case WM_MOUSEMOVE:
 833                 GetClientRect(GetParent(GetParent(hwnd)),&rect);
 834                 prevPt = pt;
 835                 break;
 836             case WM_LBUTTONUP:
 837                 ReleaseCapture();
 838                 SCROLL_trackHitTest  = hittest = SCROLL_NOWHERE;
 839                 if (hwnd==GetFocus()) ShowCaret(hwnd);
 840                 break;
 841             case WM_SYSTIMER:
 842                 pt = prevPt;
 843                 break;
 844         }
 845         return;
 846     }
 847
 848     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 849     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 850                                         &arrowSize, &thumbSize, &thumbPos );
 851     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 852     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 853
 854     switch(msg)
 855     {
 856       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 857           HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 858           SCROLL_trackVertical = vertical;
 859           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 860           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 861           lastMousePos  = lastClickPos;
 862           trackThumbPos = thumbPos;
 863           prevPt = pt;
 864           if (nBar == SB_CTL && (GetWindowLongW(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
 865           SetCapture( hwnd );
 866           break;
 867
 868       case WM_MOUSEMOVE:
 869           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 870           prevPt = pt;
 871           break;
 872
 873       case WM_LBUTTONUP:
 874           hittest = SCROLL_NOWHERE;
 875           ReleaseCapture();
 876           /* if scrollbar has focus, show back caret */
 877           if (hwnd==GetFocus()) ShowCaret(hwnd);
 878           break;
 879
 880       case WM_SYSTIMER:
 881           pt = prevPt;
 882           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 883           break;
 884
 885       default:
 886           return;  /* Should never happen */
 887     }
 888
 889     TRACE("Event: hwnd=%p bar=%d msg=%s pt=%ld,%ld hit=%d\n",
 890           hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
 891
 892     switch(SCROLL_trackHitTest)
 893     {
 894     case SCROLL_NOWHERE:  /* No tracking in progress */
 895         break;
 896
 897     case SCROLL_TOP_ARROW:
 898         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 899                            (hittest == SCROLL_trackHitTest), FALSE );
 900         if (hittest == SCROLL_trackHitTest)
 901         {
 902             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 903             {
 904                 SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 905                                 SB_LINEUP, (LPARAM)hwndCtl );
 906             }
 907
 908             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 909                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 910                             (TIMERPROC)0 );
 911         }
 912         else KillSystemTimer( hwnd, SCROLL_TIMER );
 913         break;
 914
 915     case SCROLL_TOP_RECT:
 916         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 917                              thumbPos, infoPtr->flags, vertical,
 918                              (hittest == SCROLL_trackHitTest), FALSE );
 919         if (hittest == SCROLL_trackHitTest)
 920         {
 921             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 922             {
 923                 SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 924                                 SB_PAGEUP, (LPARAM)hwndCtl );
 925             }
 926             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 927                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 928                               (TIMERPROC)0 );
 929         }
 930         else KillSystemTimer( hwnd, SCROLL_TIMER );
 931         break;
 932
 933     case SCROLL_THUMB:
 934         if (msg == WM_LBUTTONDOWN)
 935         {
 936             SCROLL_TrackingWin = hwnd;
 937             SCROLL_TrackingBar = nBar;
 938             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
 939             SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
 940                                                         vertical,
 941                                                         SCROLL_TrackingPos );
 942             if (!SCROLL_MovingThumb)
 943                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 944         }
 945         else if (msg == WM_LBUTTONUP)
 946         {
 947             if (SCROLL_MovingThumb)
 948                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 949             SCROLL_TrackingWin = 0;
 950             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 951                                  thumbPos, infoPtr->flags, vertical,
 952                                  FALSE, FALSE );
 953         }
 954         else  /* WM_MOUSEMOVE */
 955         {
 956             UINT pos;
 957
 958             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
 959             else
 960             {
 961                 pt = SCROLL_ClipPos( &rect, pt );
 962                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 963             }
 964             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
 965             {
 966                 if (SCROLL_MovingThumb)
 967                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 968                                         arrowSize, thumbSize );
 969                 lastMousePos = pos;
 970                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
 971                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
 972                                                          vertical,
 973                                                          SCROLL_TrackingPos );
 974                 SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 975                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
 976                                 (LPARAM)hwndCtl );
 977                 if (!SCROLL_MovingThumb)
 978                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 979                                         arrowSize, thumbSize );
 980             }
 981         }
 982         break;
 983
 984     case SCROLL_BOTTOM_RECT:
 985         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 986                              thumbPos, infoPtr->flags, vertical,
 987                              FALSE, (hittest == SCROLL_trackHitTest) );
 988         if (hittest == SCROLL_trackHitTest)
 989         {
 990             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 991             {
 992                 SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 993                                 SB_PAGEDOWN, (LPARAM)hwndCtl );
 994             }
 995             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 996                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 997                               (TIMERPROC)0 );
 998         }
 999         else KillSystemTimer( hwnd, SCROLL_TIMER );
1000         break;
1001
1002     case SCROLL_BOTTOM_ARROW:
1003         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1004                            FALSE, (hittest == SCROLL_trackHitTest) );
1005         if (hittest == SCROLL_trackHitTest)
1006         {
1007             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1008             {
1009                 SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1010                                 SB_LINEDOWN, (LPARAM)hwndCtl );
1011             }
1012
1013             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1014                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1015                             (TIMERPROC)0 );
1016         }
1017         else KillSystemTimer( hwnd, SCROLL_TIMER );
1018         break;
1019     }
1020
1021     if (msg == WM_LBUTTONDOWN)
1022     {
1023
1024         if (hittest == SCROLL_THUMB)
1025         {
1026             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1027                                  trackThumbPos + lastMousePos - lastClickPos );
1028             SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1029                             MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
1030         }
1031     }
1032
1033     if (msg == WM_LBUTTONUP)
1034     {
1035         hittest = SCROLL_trackHitTest;
1036         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1037
1038         if (hittest == SCROLL_THUMB)
1039         {
1040             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1041                                  trackThumbPos + lastMousePos - lastClickPos );
1042             SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1043                             MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
1044         }
1045         SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1046                           SB_ENDSCROLL, (LPARAM)hwndCtl );
1047     }
1048
1049     ReleaseDC( hwnd, hdc );
1050 }
1051
1052
1053 /***********************************************************************
1054  *           SCROLL_TrackScrollBar
1055  *
1056  * Track a mouse button press on a scroll-bar.
1057  * pt is in screen-coordinates for non-client scroll bars.
1058  */
1059 void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
1060 {
1061     MSG msg;
1062     INT xoffset = 0, yoffset = 0;
1063
1064     if (scrollbar != SB_CTL)
1065     {
1066         WND *wndPtr = WIN_GetPtr( hwnd );
1067         if (!wndPtr || wndPtr == WND_OTHER_PROCESS) return;
1068         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
1069         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
1070         WIN_ReleasePtr( wndPtr );
1071         ScreenToClient( hwnd, &pt );
1072         pt.x += xoffset;
1073         pt.y += yoffset;
1074     }
1075
1076     SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
1077
1078     do
1079     {
1080         if (!GetMessageW( &msg, 0, 0, 0 )) break;
1081         if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
1082         switch(msg.message)
1083         {
1084         case WM_LBUTTONUP:
1085         case WM_MOUSEMOVE:
1086         case WM_SYSTIMER:
1087             pt.x = (short)LOWORD(msg.lParam) + xoffset;
1088             pt.y = (short)HIWORD(msg.lParam) + yoffset;
1089             SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
1090             break;
1091         default:
1092             TranslateMessage( &msg );
1093             DispatchMessageW( &msg );
1094             break;
1095         }
1096         if (!IsWindow( hwnd ))
1097         {
1098             ReleaseCapture();
1099             break;
1100         }
1101     } while (msg.message != WM_LBUTTONUP);
1102 }
1103
1104
1105 /***********************************************************************
1106  *           SCROLL_CreateScrollBar
1107  *
1108  * Create a scroll bar
1109  *
1110  * PARAMS
1111  *    hwnd     [I] Handle of window with scrollbar(s)
1112  *    lpCreate [I] The style and place of the scroll bar
1113  */
1114 static void SCROLL_CreateScrollBar(HWND hwnd, LPCREATESTRUCTW lpCreate)
1115 {
1116     LPSCROLLBAR_INFO info = SCROLL_GetScrollBarInfo(hwnd, SB_CTL);
1117     if (!info) return;
1118
1119     TRACE("hwnd=%p lpCreate=%p\n", hwnd, lpCreate);
1120
1121     if (lpCreate->style & WS_DISABLED)
1122     {
1123         info->flags = ESB_DISABLE_BOTH;
1124         TRACE("Created WS_DISABLED scrollbar\n");
1125     }
1126
1127
1128     if (lpCreate->style & (SBS_SIZEGRIP | SBS_SIZEBOX))
1129     {
1130         if (lpCreate->style & SBS_SIZEBOXTOPLEFTALIGN)
1131             MoveWindow( hwnd, lpCreate->x, lpCreate->y, GetSystemMetrics(SM_CXVSCROLL)+1,
1132                         GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1133         else if(lpCreate->style & SBS_SIZEBOXBOTTOMRIGHTALIGN)
1134             MoveWindow( hwnd, lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1135                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1136                         GetSystemMetrics(SM_CXVSCROLL)+1,
1137                         GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1138     }
1139     else if (lpCreate->style & SBS_VERT)
1140     {
1141         if (lpCreate->style & SBS_LEFTALIGN)
1142             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1143                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1144         else if (lpCreate->style & SBS_RIGHTALIGN)
1145             MoveWindow( hwnd,
1146                         lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1147                         lpCreate->y,
1148                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1149     }
1150     else  /* SBS_HORZ */
1151     {
1152         if (lpCreate->style & SBS_TOPALIGN)
1153             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1154                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1155         else if (lpCreate->style & SBS_BOTTOMALIGN)
1156             MoveWindow( hwnd,
1157                         lpCreate->x,
1158                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1159                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1160     }
1161 }
1162
1163
1164 /*************************************************************************
1165  *           SCROLL_GetScrollInfo
1166  *
1167  * Internal helper for the API function
1168  *
1169  * PARAMS
1170  *    hwnd [I]  Handle of window with scrollbar(s)
1171  *    nBar [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1172  *    info [IO] fMask specifies which values to retrieve
1173  */
1174 static BOOL SCROLL_GetScrollInfo(HWND hwnd, INT nBar, LPSCROLLINFO info)
1175 {
1176     LPSCROLLBAR_INFO infoPtr;
1177
1178     /* handle invalid data structure */
1179     if (!SCROLL_ScrollInfoValid(info)
1180         || !(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar)))
1181             return FALSE;
1182
1183     /* fill in the desired scroll info structure */
1184     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
1185     if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
1186     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1187         info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
1188     if (info->fMask & SIF_RANGE)
1189     {
1190         info->nMin = infoPtr->minVal;
1191         info->nMax = infoPtr->maxVal;
1192     }
1193
1194     return (info->fMask & SIF_ALL) != 0;
1195 }
1196
1197
1198 /*************************************************************************
1199  *           SCROLL_GetScrollPos
1200  *
1201  *  Internal helper for the API function
1202  *
1203  * PARAMS
1204  *    hwnd [I]  Handle of window with scrollbar(s)
1205  *    nBar [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1206  */
1207 static INT SCROLL_GetScrollPos(HWND hwnd, INT nBar)
1208 {
1209     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1210     return infoPtr ? infoPtr->curVal: 0;
1211 }
1212
1213
1214 /*************************************************************************
1215  *           SCROLL_GetScrollRange
1216  *
1217  *  Internal helper for the API function
1218  *
1219  * PARAMS
1220  *    hwnd  [I]  Handle of window with scrollbar(s)
1221  *    nBar  [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1222  *    lpMin [O]  Where to store minimum value
1223  *    lpMax [O]  Where to store maximum value
1224  *
1225  * RETURNS STD
1226  */
1227 static BOOL SCROLL_GetScrollRange(HWND hwnd, INT nBar, LPINT lpMin, LPINT lpMax)
1228 {
1229     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1230
1231     if (lpMin) *lpMin = infoPtr ? infoPtr->minVal : 0;
1232     if (lpMax) *lpMax = infoPtr ? infoPtr->maxVal : 0;
1233
1234     return TRUE;
1235 }
1236
1237
1238 /*************************************************************************
1239  *           SCROLL_SetScrollRange
1240  *
1241  * PARAMS
1242  *    hwnd  [I]  Handle of window with scrollbar(s)
1243  *    nBar  [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1244  *    lpMin [I]  Minimum value
1245  *    lpMax [I]  Maximum value
1246  *
1247  */
1248 static BOOL SCROLL_SetScrollRange(HWND hwnd, INT nBar, INT minVal, INT maxVal)
1249 {
1250     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1251
1252     TRACE("hwnd=%p nBar=%d min=%d max=%d\n", hwnd, nBar, minVal, maxVal);
1253
1254     if (infoPtr)
1255     {
1256         infoPtr->minVal = minVal;
1257         infoPtr->maxVal = maxVal;
1258     }
1259     return TRUE;
1260 }
1261
1262
1263 /***********************************************************************
1264  *           ScrollBarWndProc
1265  */
1266 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
1267 {
1268     if (!IsWindow( hwnd )) return 0;
1269
1270     switch(message)
1271     {
1272     case WM_CREATE:
1273         SCROLL_CreateScrollBar(hwnd, (LPCREATESTRUCTW)lParam);
1274         break;
1275
1276     case WM_ENABLE:
1277         {
1278             SCROLLBAR_INFO *infoPtr;
1279             if ((infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_CTL )))
1280             {
1281                 infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
1282                 SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
1283             }
1284         }
1285         return 0;
1286
1287     case WM_LBUTTONDBLCLK:
1288     case WM_LBUTTONDOWN:
1289         {
1290             POINT pt;
1291             pt.x = (short)LOWORD(lParam);
1292             pt.y = (short)HIWORD(lParam);
1293             SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
1294         }
1295         break;
1296     case WM_LBUTTONUP:
1297     case WM_MOUSEMOVE:
1298     case WM_SYSTIMER:
1299         {
1300             POINT pt;
1301             pt.x = (short)LOWORD(lParam);
1302             pt.y = (short)HIWORD(lParam);
1303             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1304         }
1305         break;
1306
1307     case WM_KEYDOWN:
1308         SCROLL_HandleKbdEvent(hwnd, wParam, lParam);
1309         break;
1310
1311     case WM_KEYUP:
1312         ShowCaret(hwnd);
1313         break;
1314
1315     case WM_SETFOCUS:
1316         {
1317             /* Create a caret when a ScrollBar get focus */
1318             RECT rect;
1319             int arrowSize, thumbSize, thumbPos, vertical;
1320             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
1321                                                 &arrowSize, &thumbSize, &thumbPos );
1322             if (!vertical)
1323             {
1324                 CreateCaret(hwnd, (HBITMAP)1, thumbSize-2, rect.bottom-rect.top-2);
1325                 SetCaretPos(thumbPos+1, rect.top+1);
1326             }
1327             else
1328             {
1329                 CreateCaret(hwnd, (HBITMAP)1, rect.right-rect.left-2,thumbSize-2);
1330                 SetCaretPos(rect.top+1, thumbPos+1);
1331             }
1332             ShowCaret(hwnd);
1333         }
1334         break;
1335
1336     case WM_KILLFOCUS:
1337         {
1338             RECT rect;
1339             int arrowSize, thumbSize, thumbPos, vertical;
1340             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
1341             if (!vertical){
1342                 rect.left=thumbPos+1;
1343                 rect.right=rect.left+thumbSize;
1344             }
1345             else
1346             {
1347                 rect.top=thumbPos+1;
1348                 rect.bottom=rect.top+thumbSize;
1349             }
1350             HideCaret(hwnd);
1351             InvalidateRect(hwnd,&rect,0);
1352             DestroyCaret();
1353         }
1354         break;
1355
1356     case WM_ERASEBKGND:
1357          return 1;
1358
1359     case WM_GETDLGCODE:
1360          return DLGC_WANTARROWS; /* Windows returns this value */
1361
1362     case WM_PAINT:
1363         {
1364             PAINTSTRUCT ps;
1365             HDC hdc = wParam ? (HDC)wParam : BeginPaint(hwnd, &ps);
1366             if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEGRIP)
1367             {
1368                 SCROLL_DrawSizeGrip( hwnd, hdc);
1369             }
1370             else if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEBOX)
1371             {
1372                 RECT rc;
1373                 GetClientRect( hwnd, &rc );
1374                 FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
1375             }
1376             else
1377                 SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1378             if (!wParam) EndPaint(hwnd, &ps);
1379         }
1380         break;
1381
1382     case SBM_SETPOS16:
1383     case SBM_SETPOS:
1384         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1385
1386     case SBM_GETPOS16:
1387     case SBM_GETPOS:
1388        return SCROLL_GetScrollPos(hwnd, SB_CTL);
1389
1390     case SBM_SETRANGE16:
1391         if (wParam) message = SBM_SETRANGEREDRAW;
1392         wParam = LOWORD(lParam);
1393         lParam = HIWORD(lParam);
1394         /* fall through */
1395     case SBM_SETRANGEREDRAW:
1396     case SBM_SETRANGE:
1397         {
1398             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1399             SCROLL_SetScrollRange( hwnd, SB_CTL, wParam, lParam );
1400             if (message == SBM_SETRANGEREDRAW)
1401                 SCROLL_RefreshScrollBar( hwnd, SB_CTL, TRUE, TRUE );
1402             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1403         }
1404         return 0;
1405
1406     case SBM_GETRANGE16:
1407     {
1408         INT min, max;
1409
1410         SCROLL_GetScrollRange(hwnd, SB_CTL, &min, &max);
1411         return MAKELRESULT(min, max);
1412     }
1413
1414     case SBM_GETRANGE:
1415         return SCROLL_GetScrollRange(hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam);
1416
1417     case SBM_ENABLE_ARROWS16:
1418     case SBM_ENABLE_ARROWS:
1419         return EnableScrollBar( hwnd, SB_CTL, wParam );
1420
1421     case SBM_SETSCROLLINFO:
1422         return SCROLL_SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1423
1424     case SBM_GETSCROLLINFO:
1425         return SCROLL_GetScrollInfo(hwnd, SB_CTL, (SCROLLINFO *)lParam);
1426
1427     case 0x00e5:
1428     case 0x00e7:
1429     case 0x00e8:
1430     case 0x00eb:
1431     case 0x00ec:
1432     case 0x00ed:
1433     case 0x00ee:
1434     case 0x00ef:
1435         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1436                     message, wParam, lParam );
1437         break;
1438
1439     default:
1440         if (message >= WM_USER)
1441             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1442                          message, wParam, lParam );
1443         return DefWindowProcW( hwnd, message, wParam, lParam );
1444     }
1445     return 0;
1446 }
1447
1448
1449 /*************************************************************************
1450  *           SetScrollInfo   (USER32.@)
1451  * SetScrollInfo can be used to set the position, upper bound,
1452  * lower bound, and page size of a scrollbar control.
1453  *
1454  * PARAMS
1455  *    hwnd    [I]  Handle of window with scrollbar(s)
1456  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1457  *    info    [I]  Specifies what to change and new values
1458  *    bRedraw [I]  Should scrollbar be redrawn afterwards?
1459  *
1460  * RETURNS
1461  *    Scrollbar position
1462  *
1463  * NOTE
1464  *    For 100 lines of text to be displayed in a window of 25 lines,
1465  *  one would for instance use info->nMin=0, info->nMax=75
1466  *  (corresponding to the 76 different positions of the window on
1467  *  the text), and info->nPage=25.
1468  */
1469 INT WINAPI SetScrollInfo(HWND hwnd, INT nBar, const SCROLLINFO *info, BOOL bRedraw)
1470 {
1471     TRACE("hwnd=%p nBar=%d info=%p, bRedraw=%d\n", hwnd, nBar, info, bRedraw);
1472
1473     /* Refer SB_CTL requests to the window */
1474     if (nBar == SB_CTL)
1475         return SendMessageW(hwnd, SBM_SETSCROLLINFO, bRedraw, (LPARAM)info);
1476     else
1477         return SCROLL_SetScrollInfo( hwnd, nBar, info, bRedraw );
1478 }
1479
1480 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar, const SCROLLINFO *info, BOOL bRedraw )
1481 {
1482     /* Update the scrollbar state and set action flags according to
1483      * what has to be done graphics wise. */
1484
1485     SCROLLBAR_INFO *infoPtr;
1486     UINT new_flags;
1487     BOOL bChangeParams = FALSE; /* don't show/hide scrollbar if params don't change */
1488     INT action = 0;
1489
1490     if (!(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar))) return 0;
1491     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1492     if ((info->cbSize != sizeof(*info)) &&
1493         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1494
1495     if (TRACE_ON(scroll))
1496     {
1497         TRACE("hwnd=%p bar=%d", hwnd, nBar);
1498         if (info->fMask & SIF_PAGE) TRACE( " page=%d", info->nPage );
1499         if (info->fMask & SIF_POS) TRACE( " pos=%d", info->nPos );
1500         if (info->fMask & SIF_RANGE) TRACE( " min=%d max=%d", info->nMin, info->nMax );
1501         TRACE("\n");
1502     }
1503
1504     /* Set the page size */
1505
1506     if (info->fMask & SIF_PAGE)
1507     {
1508         if( infoPtr->page != info->nPage )
1509         {
1510             infoPtr->page = info->nPage;
1511             action |= SA_SSI_REFRESH;
1512            bChangeParams = TRUE;
1513         }
1514     }
1515
1516     /* Set the scroll pos */
1517
1518     if (info->fMask & SIF_POS)
1519     {
1520         if( infoPtr->curVal != info->nPos )
1521         {
1522             infoPtr->curVal = info->nPos;
1523             action |= SA_SSI_REFRESH;
1524         }
1525     }
1526
1527     /* Set the scroll range */
1528
1529     if (info->fMask & SIF_RANGE)
1530     {
1531         /* Invalid range -> range is set to (0,0) */
1532         if ((info->nMin > info->nMax) ||
1533             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1534         {
1535             infoPtr->minVal = 0;
1536             infoPtr->maxVal = 0;
1537             bChangeParams = TRUE;
1538         }
1539         else
1540         {
1541             if( infoPtr->minVal != info->nMin ||
1542                 infoPtr->maxVal != info->nMax )
1543             {
1544                 action |= SA_SSI_REFRESH;
1545                 infoPtr->minVal = info->nMin;
1546                 infoPtr->maxVal = info->nMax;
1547                 bChangeParams = TRUE;
1548             }
1549         }
1550     }
1551
1552     /* Make sure the page size is valid */
1553
1554     if (infoPtr->page < 0) infoPtr->page = 0;
1555     else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
1556         infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
1557
1558     /* Make sure the pos is inside the range */
1559
1560     if (infoPtr->curVal < infoPtr->minVal)
1561         infoPtr->curVal = infoPtr->minVal;
1562     else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1563         infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
1564
1565     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1566                  infoPtr->page, infoPtr->curVal,
1567                  infoPtr->minVal, infoPtr->maxVal );
1568
1569     /* don't change the scrollbar state if SetScrollInfo
1570      * is just called with SIF_DISABLENOSCROLL
1571      */
1572     if(!(info->fMask & SIF_ALL)) goto done;
1573
1574     /* Check if the scrollbar should be hidden or disabled */
1575
1576     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1577     {
1578         new_flags = infoPtr->flags;
1579         if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1580         {
1581             /* Hide or disable scroll-bar */
1582             if (info->fMask & SIF_DISABLENOSCROLL)
1583             {
1584                 new_flags = ESB_DISABLE_BOTH;
1585                 action |= SA_SSI_REFRESH;
1586             }
1587             else if ((nBar != SB_CTL) && bChangeParams)
1588             {
1589                 action = SA_SSI_HIDE;
1590                 goto done;
1591             }
1592         }
1593         else  /* Show and enable scroll-bar */
1594         {
1595             new_flags = 0;
1596             if ((nBar != SB_CTL) && bChangeParams)
1597                 action |= SA_SSI_SHOW;
1598         }
1599
1600         if (infoPtr->flags != new_flags) /* check arrow flags */
1601         {
1602             infoPtr->flags = new_flags;
1603             action |= SA_SSI_REPAINT_ARROWS;
1604         }
1605     }
1606
1607 done:
1608     if( action & SA_SSI_HIDE )
1609         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1610     else
1611     {
1612         if( action & SA_SSI_SHOW )
1613             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1614                 return infoPtr->curVal; /* SetWindowPos() already did the painting */
1615
1616         if( bRedraw )
1617             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1618         else if( action & SA_SSI_REPAINT_ARROWS )
1619             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1620     }
1621
1622     /* Return current position */
1623     return infoPtr->curVal;
1624 }
1625
1626
1627 /*************************************************************************
1628  *           GetScrollInfo   (USER32.@)
1629  *
1630  * GetScrollInfo can be used to retrieve the position, upper bound,
1631  * lower bound, and page size of a scrollbar control.
1632  *
1633  * PARAMS
1634  *  hwnd [I]  Handle of window with scrollbar(s)
1635  *  nBar [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1636  *  info [IO] fMask specifies which values to retrieve
1637  *
1638  * RETURNS STD
1639  */
1640 BOOL WINAPI GetScrollInfo(HWND hwnd, INT nBar, LPSCROLLINFO info)
1641 {
1642     TRACE("hwnd=%p nBar=%d info=%p\n", hwnd, nBar, info);
1643
1644     /* Refer SB_CTL requests to the window */
1645     if (nBar == SB_CTL)
1646         SendMessageW(hwnd, SBM_GETSCROLLINFO, (WPARAM)0, (LPARAM)info);
1647     else
1648         SCROLL_GetScrollInfo(hwnd, nBar, info);
1649
1650     return TRUE;
1651 }
1652
1653
1654 /*************************************************************************
1655  *           SetScrollPos   (USER32.@)
1656  *
1657  * PARAMS
1658  *    hwnd    [I]  Handle of window with scrollbar(s)
1659  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1660  *    nPos    [I]  New value
1661  *    bRedraw [I]  Should scrollbar be redrawn afterwards?
1662  *
1663  * RETURNS
1664  *    Success: Scrollbar position
1665  *    Failure: 0
1666  *
1667  * REMARKS
1668  *    Note the ambiguity when 0 is returned.  Use GetLastError
1669  *    to make sure there was an error (and to know which one).
1670  */
1671 INT WINAPI SetScrollPos( HWND hwnd, INT nBar, INT nPos, BOOL bRedraw)
1672 {
1673     SCROLLINFO info;
1674     SCROLLBAR_INFO *infoPtr;
1675     INT oldPos;
1676
1677     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return 0;
1678     oldPos      = infoPtr->curVal;
1679     info.cbSize = sizeof(info);
1680     info.nPos   = nPos;
1681     info.fMask  = SIF_POS;
1682     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1683     return oldPos;
1684 }
1685
1686
1687 /*************************************************************************
1688  *           GetScrollPos   (USER32.@)
1689  *
1690  * PARAMS
1691  *    hwnd    [I]  Handle of window with scrollbar(s)
1692  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1693  *
1694  * RETURNS
1695  *    Success: Current position
1696  *    Failure: 0
1697  *
1698  * REMARKS
1699  *    There is ambiguity when 0 is returned.  Use GetLastError
1700  *    to make sure there was an error (and to know which one).
1701  */
1702 INT WINAPI GetScrollPos(HWND hwnd, INT nBar)
1703 {
1704     TRACE("hwnd=%p nBar=%d\n", hwnd, nBar);
1705
1706     /* Refer SB_CTL requests to the window */
1707     if (nBar == SB_CTL)
1708         return SendMessageW(hwnd, SBM_GETPOS, (WPARAM)0, (LPARAM)0);
1709     else
1710         return SCROLL_GetScrollPos(hwnd, nBar);
1711 }
1712
1713
1714 /*************************************************************************
1715  *           SetScrollRange   (USER32.@)
1716  *
1717  * PARAMS
1718  *    hwnd    [I]  Handle of window with scrollbar(s)
1719  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1720  *    minVal  [I]  New minimum value
1721  *    maxVal  [I]  New Maximum value
1722  *    bRedraw [I]  Should scrollbar be redrawn afterwards?
1723  *
1724  * RETURNS STD
1725  */
1726 BOOL WINAPI SetScrollRange(HWND hwnd, INT nBar, INT minVal, INT maxVal, BOOL bRedraw)
1727 {
1728     SCROLLINFO info;
1729
1730     TRACE("hwnd=%p nBar=%d min=%d max=%d, bRedraw=%d\n", hwnd, nBar, minVal, maxVal, bRedraw);
1731
1732     info.cbSize = sizeof(info);
1733     info.fMask  = SIF_RANGE;
1734     info.nMin   = minVal;
1735     info.nMax   = maxVal;
1736     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1737     return TRUE;
1738 }
1739
1740
1741 /*************************************************************************
1742  *           SCROLL_SetNCSbState
1743  *
1744  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1745  */
1746 INT SCROLL_SetNCSbState(HWND hwnd, int vMin, int vMax, int vPos,
1747                         int hMin, int hMax, int hPos)
1748 {
1749     SCROLLINFO vInfo, hInfo;
1750
1751     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1752     vInfo.nMin   = vMin;
1753     vInfo.nMax   = vMax;
1754     vInfo.nPos   = vPos;
1755     hInfo.nMin   = hMin;
1756     hInfo.nMax   = hMax;
1757     hInfo.nPos   = hPos;
1758     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1759
1760     SCROLL_SetScrollInfo( hwnd, SB_VERT, &vInfo, TRUE );
1761     SCROLL_SetScrollInfo( hwnd, SB_HORZ, &hInfo, TRUE );
1762
1763     return 0;
1764 }
1765
1766
1767 /*************************************************************************
1768  *           GetScrollRange   (USER32.@)
1769  *
1770  * PARAMS
1771  *    hwnd    [I]  Handle of window with scrollbar(s)
1772  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1773  *    lpMin   [O]  Where to store minimum value
1774  *    lpMax   [O]  Where to store maximum value
1775  *
1776  * RETURNS STD
1777  */
1778 BOOL WINAPI GetScrollRange(HWND hwnd, INT nBar, LPINT lpMin, LPINT lpMax)
1779 {
1780     TRACE("hwnd=%p nBar=%d lpMin=%p lpMax=%p\n", hwnd, nBar, lpMin, lpMax);
1781
1782     /* Refer SB_CTL requests to the window */
1783     if (nBar == SB_CTL)
1784         SendMessageW(hwnd, SBM_GETRANGE, (WPARAM)lpMin, (LPARAM)lpMax);
1785     else
1786         SCROLL_GetScrollRange(hwnd, nBar, lpMin, lpMax);
1787
1788     return TRUE;
1789 }
1790
1791
1792 /*************************************************************************
1793  *           SCROLL_ShowScrollBar()
1794  *
1795  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1796  */
1797 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1798                              BOOL fShowH, BOOL fShowV )
1799 {
1800     LONG style = GetWindowLongW( hwnd, GWL_STYLE );
1801
1802     TRACE("hwnd=%p bar=%d horz=%d, vert=%d\n", hwnd, nBar, fShowH, fShowV );
1803
1804     switch(nBar)
1805     {
1806     case SB_CTL:
1807         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1808         return TRUE;
1809
1810     case SB_BOTH:
1811     case SB_HORZ:
1812         if (fShowH)
1813         {
1814             fShowH = !(style & WS_HSCROLL);
1815             style |= WS_HSCROLL;
1816         }
1817         else  /* hide it */
1818         {
1819             fShowH = (style & WS_HSCROLL);
1820             style &= ~WS_HSCROLL;
1821         }
1822         if( nBar == SB_HORZ ) {
1823             fShowV = FALSE;
1824             break;
1825         }
1826         /* fall through */
1827
1828     case SB_VERT:
1829         if (fShowV)
1830         {
1831             fShowV = !(style & WS_VSCROLL);
1832             style |= WS_VSCROLL;
1833         }
1834         else  /* hide it */
1835         {
1836             fShowV = (style & WS_VSCROLL);
1837             style &= ~WS_VSCROLL;
1838         }
1839         if ( nBar == SB_VERT )
1840            fShowH = FALSE;
1841         break;
1842
1843     default:
1844         return FALSE;  /* Nothing to do! */
1845     }
1846
1847     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1848     {
1849         WIN_SetStyle( hwnd, style );
1850         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1851                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1852         return TRUE;
1853     }
1854     return FALSE; /* no frame changes */
1855 }
1856
1857
1858 /*************************************************************************
1859  *           ShowScrollBar   (USER32.@)
1860  *
1861  * PARAMS
1862  *    hwnd    [I]  Handle of window with scrollbar(s)
1863  *    nBar    [I]  One of SB_HORZ, SB_VERT, or SB_CTL
1864  *    fShow   [I]  TRUE = show, FALSE = hide
1865  *
1866  * RETURNS STD
1867  */
1868 BOOL WINAPI ShowScrollBar(HWND hwnd, INT nBar, BOOL fShow)
1869 {
1870     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1871                                       (nBar == SB_HORZ) ? 0 : fShow );
1872     return TRUE;
1873 }
1874
1875
1876 /*************************************************************************
1877  *           EnableScrollBar   (USER32.@)
1878  */
1879 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1880 {
1881     BOOL bFineWithMe;
1882     SCROLLBAR_INFO *infoPtr;
1883
1884     TRACE("%p %d %d\n", hwnd, nBar, flags );
1885
1886     flags &= ESB_DISABLE_BOTH;
1887
1888     if (nBar == SB_BOTH)
1889     {
1890         if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_VERT ))) return FALSE;
1891         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1892         {
1893             infoPtr->flags = flags;
1894             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1895         }
1896         nBar = SB_HORZ;
1897     }
1898     else
1899         bFineWithMe = TRUE;
1900
1901     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return FALSE;
1902     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1903     infoPtr->flags = flags;
1904
1905     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1906     return TRUE;
1907 }