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 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_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( 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_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 466                                     INT arrowSize, INT thumbSize )
 467 {
 468   INT pos = SCROLL_TrackingPos;
 469   INT max_size;
 470
 471   if( vertical )
 472     max_size = rect->bottom - rect->top;
 473   else
 474     max_size = rect->right - rect->left;
 475
 476   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 477
 478   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 479     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 480   else if( pos > max_size )
 481     pos = max_size;
 482
 483   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 484                           rect, arrowSize, thumbSize, pos,
 485                           0, vertical, FALSE, FALSE );
 486
 487   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 488 }
 489
 490 /***********************************************************************
 491  *           SCROLL_DrawInterior
 492  *
 493  * Draw the scroll bar interior (everything except the arrows).
 494  */
 495 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 496                                     RECT *rect, INT arrowSize,
 497                                     INT thumbSize, INT thumbPos,
 498                                     UINT flags, BOOL vertical,
 499                                     BOOL top_selected, BOOL bottom_selected )
 500 {
 501     RECT r;
 502     HPEN hSavePen;
 503     HBRUSH hSaveBrush,hBrush;
 504
 505     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 506      * The window-owned scrollbars need to call DEFWND_ControlColor
 507      * to correctly setup default scrollbar colors
 508      */
 509     if (nBar == SB_CTL)
 510     {
 511       hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 512                                      (WPARAM)hdc,(LPARAM)hwnd);
 513     }
 514     else
 515     {
 516       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 517     }
 518
 519     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 520     hSaveBrush = SelectObject( hdc, hBrush );
 521
 522     /* Calculate the scroll rectangle */
 523     r = *rect;
 524     if (vertical)
 525     {
 526         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 527         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 528     }
 529     else
 530     {
 531         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 532         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 533     }
 534
 535     /* Draw the scroll rectangles and thumb */
 536     if (!thumbPos)  /* No thumb to draw */
 537     {
 538         PatBlt( hdc, r.left, r.top,
 539                      r.right - r.left, r.bottom - r.top,
 540                      PATCOPY );
 541
 542         /* cleanup and return */
 543         SelectObject( hdc, hSavePen );
 544         SelectObject( hdc, hSaveBrush );
 545         return;
 546     }
 547
 548     if (vertical)
 549     {
 550         PatBlt( hdc, r.left, r.top,
 551                   r.right - r.left,
 552                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 553                   top_selected ? 0x0f0000 : PATCOPY );
 554         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 555         PatBlt( hdc, r.left, r.top + thumbSize,
 556                   r.right - r.left,
 557                   r.bottom - r.top - thumbSize,
 558                   bottom_selected ? 0x0f0000 : PATCOPY );
 559         r.bottom = r.top + thumbSize;
 560     }
 561     else  /* horizontal */
 562     {
 563         PatBlt( hdc, r.left, r.top,
 564                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 565                   r.bottom - r.top,
 566                   top_selected ? 0x0f0000 : PATCOPY );
 567         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 568         PatBlt( hdc, r.left + thumbSize, r.top,
 569                   r.right - r.left - thumbSize,
 570                   r.bottom - r.top,
 571                   bottom_selected ? 0x0f0000 : PATCOPY );
 572         r.right = r.left + thumbSize;
 573     }
 574
 575     /* Draw the thumb */
 576     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 577
 578     /* cleanup */
 579     SelectObject( hdc, hSavePen );
 580     SelectObject( hdc, hSaveBrush );
 581 }
 582
 583
 584 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 585                                  RECT *rect, INT arrowSize,
 586                                  INT thumbSize, INT thumbPos,
 587                                  UINT flags, BOOL vertical,
 588                                  BOOL top_selected, BOOL bottom_selected )
 589 {
 590     RECT r;
 591     HPEN hSavePen;
 592     HBRUSH hSaveBrush,hBrush;
 593     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 594
 595     if (Save_SCROLL_MovingThumb &&
 596         (SCROLL_TrackingWin == hwnd) &&
 597         (SCROLL_TrackingBar == nBar))
 598         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 599
 600       /* Select the correct brush and pen */
 601
 602     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 603      * The window-owned scrollbars need to call DEFWND_ControlColor
 604      * to correctly setup default scrollbar colors
 605      */
 606     if (nBar == SB_CTL) {
 607         hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 608                                        (WPARAM)hdc,(LPARAM)hwnd);
 609     } else {
 610         hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 611     }
 612     hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
 613     hSaveBrush = SelectObject( hdc, hBrush );
 614
 615       /* Calculate the scroll rectangle */
 616
 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 bar frame */
 630
 631       /* Draw the scroll rectangles and thumb */
 632
 633     if (!thumbPos)  /* No thumb to draw */
 634     {
 635         PatBlt( hdc, r.left, r.top, r.right - r.left, r.bottom - r.top, PATCOPY );
 636
 637         /* cleanup and return */
 638         SelectObject( hdc, hSavePen );
 639         SelectObject( hdc, hSaveBrush );
 640         return;
 641     }
 642
 643     if (vertical)
 644     {
 645         PatBlt( hdc, r.left, r.top, 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, r.right - r.left,
 650                 r.bottom - r.top - thumbSize,
 651                 bottom_selected ? 0x0f0000 : PATCOPY );
 652         r.bottom = r.top + thumbSize;
 653     }
 654     else  /* horizontal */
 655     {
 656         PatBlt( hdc, r.left, r.top,
 657                 thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 658                 r.bottom - r.top, top_selected ? 0x0f0000 : PATCOPY );
 659         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 660         PatBlt( hdc, r.left + thumbSize, r.top, r.right - r.left - thumbSize,
 661                 r.bottom - r.top, bottom_selected ? 0x0f0000 : PATCOPY );
 662         r.right = r.left + thumbSize;
 663     }
 664
 665       /* Draw the thumb */
 666
 667     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 668     Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 669     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 670
 671     if (Save_SCROLL_MovingThumb &&
 672         (SCROLL_TrackingWin == hwnd) &&
 673         (SCROLL_TrackingBar == nBar))
 674         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 675
 676     /* cleanup */
 677     SelectObject( hdc, hSavePen );
 678     SelectObject( hdc, hSaveBrush );
 679 }
 680
 681
 682 /***********************************************************************
 683  *           SCROLL_DrawScrollBar
 684  *
 685  * Redraw the whole scrollbar.
 686  */
 687 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 688                            BOOL arrows, BOOL interior )
 689 {
 690     INT arrowSize, thumbSize, thumbPos;
 691     RECT rect;
 692     BOOL vertical;
 693     WND *wndPtr = WIN_FindWndPtr( hwnd );
 694     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 695     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 696
 697     if (!wndPtr || !infoPtr ||
 698         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 699         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 700     if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
 701     hwnd = wndPtr->hwndSelf;  /* make it a full handle */
 702
 703     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 704                                         &arrowSize, &thumbSize, &thumbPos );
 705
 706     /* do not draw if the scrollbar rectangle is empty */
 707     if(IsRectEmpty(&rect))
 708       goto END;
 709
 710     if (Save_SCROLL_MovingThumb &&
 711         (SCROLL_TrackingWin == hwnd) &&
 712         (SCROLL_TrackingBar == nBar))
 713         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 714
 715       /* Draw the arrows */
 716
 717     if (arrows && arrowSize)
 718     {
 719         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 720             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 721                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 722                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 723         else
 724             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 725                                                                FALSE, FALSE );
 726     }
 727     if( interior )
 728         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 729                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 730
 731     if (Save_SCROLL_MovingThumb &&
 732         (SCROLL_TrackingWin == hwnd) &&
 733         (SCROLL_TrackingBar == nBar))
 734         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 735
 736     /* if scroll bar has focus, reposition the caret */
 737     if(hwnd==GetFocus() && (nBar==SB_CTL))
 738     {
 739         if (!vertical)
 740         {
 741             SetCaretPos(thumbPos+1, rect.top+1);
 742         }
 743         else
 744         {
 745             SetCaretPos(rect.top+1, thumbPos+1);
 746         }
 747     }
 748
 749 END:
 750     WIN_ReleaseWndPtr(wndPtr);
 751 }
 752
 753 /***********************************************************************
 754  *           SCROLL_DrawSizeGrip
 755  *
 756  *  Draw the size grip.
 757  */
 758 static void SCROLL_DrawSizeGrip( HWND hwnd,  HDC hdc)
 759 {
 760     RECT rc;
 761
 762     GetClientRect( hwnd, &rc );
 763     FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
 764     rc.left = max( rc.left, rc.right - GetSystemMetrics(SM_CXVSCROLL) - 1 );
 765     rc.top  = max( rc.top, rc.bottom - GetSystemMetrics(SM_CYHSCROLL) - 1 );
 766     DrawFrameControl( hdc, &rc, DFC_SCROLL, DFCS_SCROLLSIZEGRIP );
 767 }
 768
 769
 770 /***********************************************************************
 771  *           SCROLL_RefreshScrollBar
 772  *
 773  * Repaint the scroll bar interior after a SetScrollRange() or
 774  * SetScrollPos() call.
 775  */
 776 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 777                                      BOOL arrows, BOOL interior )
 778 {
 779     HDC hdc = GetDCEx( hwnd, 0,
 780                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 781     if (!hdc) return;
 782
 783     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 784     ReleaseDC( hwnd, hdc );
 785 }
 786
 787
 788 /***********************************************************************
 789  *           SCROLL_HandleKbdEvent
 790  *
 791  * Handle a keyboard event (only for SB_CTL scrollbars with focus).
 792  */
 793 static void SCROLL_HandleKbdEvent(
 794 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
 795 WPARAM wParam /* [in] Variable input including enable state */,
 796 LPARAM lParam /* [in] Variable input including input point */)
 797 {
 798     TRACE("hwnd=%p wParam=%d lParam=%ld\n", hwnd, wParam, lParam);
 799
 800     /* hide caret on first KEYDOWN to prevent flicker */
 801     if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
 802         HideCaret(hwnd);
 803
 804     switch(wParam)
 805     {
 806     case VK_PRIOR: wParam = SB_PAGEUP; break;
 807     case VK_NEXT:  wParam = SB_PAGEDOWN; break;
 808     case VK_HOME:  wParam = SB_TOP; break;
 809     case VK_END:   wParam = SB_BOTTOM; break;
 810     case VK_UP:    wParam = SB_LINEUP; break;
 811     case VK_DOWN:  wParam = SB_LINEDOWN; break;
 812     default: return;
 813     }
 814     SendMessageW(GetParent(hwnd),
 815         ((GetWindowLongA( hwnd, GWL_STYLE ) & SBS_VERT) ?
 816             WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
 817 }
 818
 819
 820 /***********************************************************************
 821  *           SCROLL_HandleScrollEvent
 822  *
 823  * Handle a mouse or timer event for the scrollbar.
 824  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 825  * windows coordinates.
 826  */
 827 static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 828 {
 829       /* Previous mouse position for timer events */
 830     static POINT prevPt;
 831       /* Thumb position when tracking started. */
 832     static UINT trackThumbPos;
 833       /* Position in the scroll-bar of the last button-down event. */
 834     static INT lastClickPos;
 835       /* Position in the scroll-bar of the last mouse event. */
 836     static INT lastMousePos;
 837
 838     enum SCROLL_HITTEST hittest;
 839     HWND hwndOwner, hwndCtl;
 840     BOOL vertical;
 841     INT arrowSize, thumbSize, thumbPos;
 842     RECT rect;
 843     HDC hdc;
 844
 845     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
 846     if (!infoPtr) return;
 847     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 848                   return;
 849
 850     if (nBar == SB_CTL && (GetWindowLongW( hwnd, GWL_STYLE ) & (SBS_SIZEGRIP | SBS_SIZEBOX)))
 851     {
 852         switch(msg)
 853         {
 854             case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 855                 HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 856                 SetCapture( hwnd );
 857                 prevPt = pt;
 858                 SCROLL_trackHitTest  = hittest = SCROLL_THUMB;
 859                 break;
 860             case WM_MOUSEMOVE:
 861                 GetClientRect(GetParent(GetParent(hwnd)),&rect);
 862                 prevPt = pt;
 863                 break;
 864             case WM_LBUTTONUP:
 865                 ReleaseCapture();
 866                 SCROLL_trackHitTest  = hittest = SCROLL_NOWHERE;
 867                 if (hwnd==GetFocus()) ShowCaret(hwnd);
 868                 break;
 869             case WM_SYSTIMER:
 870                 pt = prevPt;
 871                 break;
 872         }
 873         return;
 874     }
 875
 876     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 877     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 878                                         &arrowSize, &thumbSize, &thumbPos );
 879     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 880     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 881
 882     switch(msg)
 883     {
 884       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 885           HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
 886           SCROLL_trackVertical = vertical;
 887           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 888           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 889           lastMousePos  = lastClickPos;
 890           trackThumbPos = thumbPos;
 891           prevPt = pt;
 892           if (nBar == SB_CTL && (GetWindowLongA(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
 893           SetCapture( hwnd );
 894           break;
 895
 896       case WM_MOUSEMOVE:
 897           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 898           prevPt = pt;
 899           break;
 900
 901       case WM_LBUTTONUP:
 902           hittest = SCROLL_NOWHERE;
 903           ReleaseCapture();
 904           /* if scrollbar has focus, show back caret */
 905           if (hwnd==GetFocus()) ShowCaret(hwnd);
 906           break;
 907
 908       case WM_SYSTIMER:
 909           pt = prevPt;
 910           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 911           break;
 912
 913       default:
 914           return;  /* Should never happen */
 915     }
 916
 917     TRACE("Event: hwnd=%p bar=%d msg=%s pt=%ld,%ld hit=%d\n",
 918           hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
 919
 920     switch(SCROLL_trackHitTest)
 921     {
 922     case SCROLL_NOWHERE:  /* No tracking in progress */
 923         break;
 924
 925     case SCROLL_TOP_ARROW:
 926         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 927                            (hittest == SCROLL_trackHitTest), FALSE );
 928         if (hittest == SCROLL_trackHitTest)
 929         {
 930             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 931             {
 932                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 933                                 SB_LINEUP, (LPARAM)hwndCtl );
 934             }
 935
 936             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 937                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 938                             (TIMERPROC)0 );
 939         }
 940         else KillSystemTimer( hwnd, SCROLL_TIMER );
 941         break;
 942
 943     case SCROLL_TOP_RECT:
 944         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 945                              thumbPos, infoPtr->flags, vertical,
 946                              (hittest == SCROLL_trackHitTest), FALSE );
 947         if (hittest == SCROLL_trackHitTest)
 948         {
 949             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 950             {
 951                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 952                                 SB_PAGEUP, (LPARAM)hwndCtl );
 953             }
 954             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 955                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 956                               (TIMERPROC)0 );
 957         }
 958         else KillSystemTimer( hwnd, SCROLL_TIMER );
 959         break;
 960
 961     case SCROLL_THUMB:
 962         if (msg == WM_LBUTTONDOWN)
 963         {
 964             SCROLL_TrackingWin = hwnd;
 965             SCROLL_TrackingBar = nBar;
 966             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
 967             SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
 968                                                         vertical,
 969                                                         SCROLL_TrackingPos );
 970             if (!SCROLL_MovingThumb)
 971                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 972         }
 973         else if (msg == WM_LBUTTONUP)
 974         {
 975             if (SCROLL_MovingThumb)
 976                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 977             SCROLL_TrackingWin = 0;
 978             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 979                                  thumbPos, infoPtr->flags, vertical,
 980                                  FALSE, FALSE );
 981         }
 982         else  /* WM_MOUSEMOVE */
 983         {
 984             UINT pos;
 985
 986             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
 987             else
 988             {
 989                 pt = SCROLL_ClipPos( &rect, pt );
 990                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 991             }
 992             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
 993             {
 994                 if (SCROLL_MovingThumb)
 995                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 996                                         arrowSize, thumbSize );
 997                 lastMousePos = pos;
 998                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
 999                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1000                                                          vertical,
1001                                                          SCROLL_TrackingPos );
1002                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1003                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
1004                                 (LPARAM)hwndCtl );
1005                 if (!SCROLL_MovingThumb)
1006                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1007                                         arrowSize, thumbSize );
1008             }
1009         }
1010         break;
1011
1012     case SCROLL_BOTTOM_RECT:
1013         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1014                              thumbPos, infoPtr->flags, vertical,
1015                              FALSE, (hittest == SCROLL_trackHitTest) );
1016         if (hittest == SCROLL_trackHitTest)
1017         {
1018             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1019             {
1020                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1021                                 SB_PAGEDOWN, (LPARAM)hwndCtl );
1022             }
1023             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1024                               SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1025                               (TIMERPROC)0 );
1026         }
1027         else KillSystemTimer( hwnd, SCROLL_TIMER );
1028         break;
1029
1030     case SCROLL_BOTTOM_ARROW:
1031         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1032                            FALSE, (hittest == SCROLL_trackHitTest) );
1033         if (hittest == SCROLL_trackHitTest)
1034         {
1035             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1036             {
1037                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1038                                 SB_LINEDOWN, (LPARAM)hwndCtl );
1039             }
1040
1041             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1042                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1043                             (TIMERPROC)0 );
1044         }
1045         else KillSystemTimer( hwnd, SCROLL_TIMER );
1046         break;
1047     }
1048
1049     if (msg == WM_LBUTTONDOWN)
1050     {
1051
1052         if (hittest == SCROLL_THUMB)
1053         {
1054             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1055                                  trackThumbPos + lastMousePos - lastClickPos );
1056             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1057                             MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
1058         }
1059     }
1060
1061     if (msg == WM_LBUTTONUP)
1062     {
1063         hittest = SCROLL_trackHitTest;
1064         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1065
1066         if (hittest == SCROLL_THUMB)
1067         {
1068             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1069                                  trackThumbPos + lastMousePos - lastClickPos );
1070             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1071                             MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
1072         }
1073         SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1074                           SB_ENDSCROLL, (LPARAM)hwndCtl );
1075     }
1076
1077     ReleaseDC( hwnd, hdc );
1078 }
1079
1080
1081 /***********************************************************************
1082  *           SCROLL_TrackScrollBar
1083  *
1084  * Track a mouse button press on a scroll-bar.
1085  * pt is in screen-coordinates for non-client scroll bars.
1086  */
1087 void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
1088 {
1089     MSG msg;
1090     INT xoffset = 0, yoffset = 0;
1091
1092     if (scrollbar != SB_CTL)
1093     {
1094         WND *wndPtr = WIN_GetPtr( hwnd );
1095         if (!wndPtr || wndPtr == WND_OTHER_PROCESS) return;
1096         xoffset = wndPtr->rectClient.left - wndPtr->rectWindow.left;
1097         yoffset = wndPtr->rectClient.top - wndPtr->rectWindow.top;
1098         WIN_ReleasePtr( wndPtr );
1099         ScreenToClient( hwnd, &pt );
1100         pt.x += xoffset;
1101         pt.y += yoffset;
1102     }
1103
1104     SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
1105
1106     do
1107     {
1108         if (!GetMessageW( &msg, 0, 0, 0 )) break;
1109         if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
1110         switch(msg.message)
1111         {
1112         case WM_LBUTTONUP:
1113         case WM_MOUSEMOVE:
1114         case WM_SYSTIMER:
1115             pt.x = (short)LOWORD(msg.lParam) + xoffset;
1116             pt.y = (short)HIWORD(msg.lParam) + yoffset;
1117             SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
1118             break;
1119         default:
1120             TranslateMessage( &msg );
1121             DispatchMessageW( &msg );
1122             break;
1123         }
1124         if (!IsWindow( hwnd ))
1125         {
1126             ReleaseCapture();
1127             break;
1128         }
1129     } while (msg.message != WM_LBUTTONUP);
1130 }
1131
1132
1133 /***********************************************************************
1134  *           SCROLL_CreateScrollBar
1135  *
1136  *  Create a scroll bar
1137  */
1138 static void SCROLL_CreateScrollBar(
1139 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1140 LPCREATESTRUCTW lpCreate /* [in] The style and place of the scroll bar */)
1141 {
1142     LPSCROLLBAR_INFO info = SCROLL_GetScrollBarInfo(hwnd, SB_CTL);
1143     if (!info) return;
1144
1145     TRACE("hwnd=%p lpCreate=%p\n", hwnd, lpCreate);
1146
1147     if (lpCreate->style & WS_DISABLED)
1148     {
1149         info->flags = ESB_DISABLE_BOTH;
1150         TRACE("Created WS_DISABLED scrollbar\n");
1151     }
1152
1153
1154     if (lpCreate->style & (SBS_SIZEGRIP | SBS_SIZEBOX))
1155     {
1156         if (lpCreate->style & SBS_SIZEBOXTOPLEFTALIGN)
1157             MoveWindow( hwnd, lpCreate->x, lpCreate->y, GetSystemMetrics(SM_CXVSCROLL)+1,
1158                         GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1159         else if(lpCreate->style & SBS_SIZEBOXBOTTOMRIGHTALIGN)
1160             MoveWindow( hwnd, lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1161                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1162                         GetSystemMetrics(SM_CXVSCROLL)+1,
1163                         GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1164     }
1165     else if (lpCreate->style & SBS_VERT)
1166     {
1167         if (lpCreate->style & SBS_LEFTALIGN)
1168             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1169                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1170         else if (lpCreate->style & SBS_RIGHTALIGN)
1171             MoveWindow( hwnd,
1172                         lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1173                         lpCreate->y,
1174                         GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
1175     }
1176     else  /* SBS_HORZ */
1177     {
1178         if (lpCreate->style & SBS_TOPALIGN)
1179             MoveWindow( hwnd, lpCreate->x, lpCreate->y,
1180                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1181         else if (lpCreate->style & SBS_BOTTOMALIGN)
1182             MoveWindow( hwnd,
1183                         lpCreate->x,
1184                         lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1185                         lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1186     }
1187 }
1188
1189
1190 /*************************************************************************
1191  *           SCROLL_GetScrollInfo
1192  *
1193  *  Internal helper for the API function
1194  */
1195 static BOOL SCROLL_GetScrollInfo(
1196 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1197 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1198 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1199 {
1200     LPSCROLLBAR_INFO infoPtr;
1201
1202     /* handle invalid data structure */
1203     if (!SCROLL_ScrollInfoValid(info)
1204         || !(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar)))
1205             return FALSE;
1206
1207     /* fill in the desired scroll info structure */
1208     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
1209     if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
1210     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1211         info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
1212     if (info->fMask & SIF_RANGE)
1213     {
1214         info->nMin = infoPtr->minVal;
1215         info->nMax = infoPtr->maxVal;
1216     }
1217
1218     return (info->fMask & SIF_ALL) != 0;
1219 }
1220
1221
1222 /*************************************************************************
1223  *           SCROLL_GetScrollPos
1224  *
1225  *  Internal helper for the API function
1226  */
1227 static INT SCROLL_GetScrollPos(
1228 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1229 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1230 {
1231     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1232     return infoPtr ? infoPtr->curVal: 0;
1233 }
1234
1235
1236 /*************************************************************************
1237  *           SCROLL_GetScrollRange
1238  *
1239  *  Internal helper for the API function
1240  *
1241  * RETURNS STD
1242  */
1243 static BOOL SCROLL_GetScrollRange(
1244 HWND hwnd, /* [in] Handle of window */
1245 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */
1246 LPINT lpMin, /* [out] Where to store minimum value */
1247 LPINT lpMax /* [out] Where to store maximum value */)
1248 {
1249     LPSCROLLBAR_INFO infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar);
1250
1251     if (lpMin) *lpMin = infoPtr ? infoPtr->minVal : 0;
1252     if (lpMax) *lpMax = infoPtr ? infoPtr->maxVal : 0;
1253
1254     return infoPtr ? TRUE : FALSE;
1255 }
1256
1257
1258
1259 /***********************************************************************
1260  *           ScrollBarWndProc
1261  */
1262 static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
1263 {
1264     if (!IsWindow( hwnd )) return 0;
1265
1266     switch(message)
1267     {
1268     case WM_CREATE:
1269         SCROLL_CreateScrollBar(hwnd, (LPCREATESTRUCTW)lParam);
1270         if (!hUpArrow) SCROLL_LoadBitmaps();
1271         break;
1272
1273     case WM_ENABLE:
1274         {
1275             SCROLLBAR_INFO *infoPtr;
1276             if ((infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_CTL )))
1277             {
1278                 infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
1279                 SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
1280             }
1281         }
1282         return 0;
1283
1284     case WM_LBUTTONDBLCLK:
1285     case WM_LBUTTONDOWN:
1286         {
1287             POINT pt;
1288             pt.x = (short)LOWORD(lParam);
1289             pt.y = (short)HIWORD(lParam);
1290             SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
1291         }
1292         break;
1293     case WM_LBUTTONUP:
1294     case WM_MOUSEMOVE:
1295     case WM_SYSTIMER:
1296         {
1297             POINT pt;
1298             pt.x = (short)LOWORD(lParam);
1299             pt.y = (short)HIWORD(lParam);
1300             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1301         }
1302         break;
1303
1304     case WM_KEYDOWN:
1305         SCROLL_HandleKbdEvent(hwnd, wParam, lParam);
1306         break;
1307
1308     case WM_KEYUP:
1309         ShowCaret(hwnd);
1310         break;
1311
1312     case WM_SETFOCUS:
1313         {
1314             /* Create a caret when a ScrollBar get focus */
1315             RECT rect;
1316             int arrowSize, thumbSize, thumbPos, vertical;
1317             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
1318                                                 &arrowSize, &thumbSize, &thumbPos );
1319             if (!vertical)
1320             {
1321                 CreateCaret(hwnd, (HBITMAP)1, thumbSize-2, rect.bottom-rect.top-2);
1322                 SetCaretPos(thumbPos+1, rect.top+1);
1323             }
1324             else
1325             {
1326                 CreateCaret(hwnd, (HBITMAP)1, rect.right-rect.left-2,thumbSize-2);
1327                 SetCaretPos(rect.top+1, thumbPos+1);
1328             }
1329             ShowCaret(hwnd);
1330         }
1331         break;
1332
1333     case WM_KILLFOCUS:
1334         {
1335             RECT rect;
1336             int arrowSize, thumbSize, thumbPos, vertical;
1337             vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
1338             if (!vertical){
1339                 rect.left=thumbPos+1;
1340                 rect.right=rect.left+thumbSize;
1341             }
1342             else
1343             {
1344                 rect.top=thumbPos+1;
1345                 rect.bottom=rect.top+thumbSize;
1346             }
1347             HideCaret(hwnd);
1348             InvalidateRect(hwnd,&rect,0);
1349             DestroyCaret();
1350         }
1351         break;
1352
1353     case WM_ERASEBKGND:
1354          return 1;
1355
1356     case WM_GETDLGCODE:
1357          return DLGC_WANTARROWS; /* Windows returns this value */
1358
1359     case WM_PAINT:
1360         {
1361             PAINTSTRUCT ps;
1362             HDC hdc = wParam ? (HDC)wParam : BeginPaint(hwnd, &ps);
1363             if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEGRIP)
1364             {
1365                 SCROLL_DrawSizeGrip( hwnd, hdc);
1366             }
1367             else if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEBOX)
1368             {
1369                 RECT rc;
1370                 GetClientRect( hwnd, &rc );
1371                 FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
1372             }
1373             else
1374                 SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1375             if (!wParam) EndPaint(hwnd, &ps);
1376         }
1377         break;
1378
1379     case SBM_SETPOS16:
1380     case SBM_SETPOS:
1381         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1382
1383     case SBM_GETPOS16:
1384     case SBM_GETPOS:
1385        return SCROLL_GetScrollPos(hwnd, SB_CTL);
1386
1387     case SBM_SETRANGE16:
1388         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
1389                           wParam  /* FIXME: Is this correct? */ );
1390         return 0;
1391
1392     case SBM_SETRANGE:
1393         {
1394             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1395             SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
1396             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1397         }
1398         return 0;
1399
1400     case SBM_GETRANGE16:
1401         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
1402         return 0;
1403
1404     case SBM_GETRANGE:
1405         return SCROLL_GetScrollRange(hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam);
1406
1407     case SBM_ENABLE_ARROWS16:
1408     case SBM_ENABLE_ARROWS:
1409         return EnableScrollBar( hwnd, SB_CTL, wParam );
1410
1411     case SBM_SETRANGEREDRAW:
1412         {
1413             INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
1414             SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
1415             if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
1416         }
1417         return 0;
1418
1419     case SBM_SETSCROLLINFO:
1420         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1421
1422     case SBM_GETSCROLLINFO:
1423         return SCROLL_GetScrollInfo(hwnd, SB_CTL, (SCROLLINFO *)lParam);
1424
1425     case 0x00e5:
1426     case 0x00e7:
1427     case 0x00e8:
1428     case 0x00eb:
1429     case 0x00ec:
1430     case 0x00ed:
1431     case 0x00ee:
1432     case 0x00ef:
1433         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1434                     message, wParam, lParam );
1435         break;
1436
1437     default:
1438         if (message >= WM_USER)
1439             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1440                          message, wParam, lParam );
1441         return DefWindowProcW( hwnd, message, wParam, lParam );
1442     }
1443     return 0;
1444 }
1445
1446
1447 /*************************************************************************
1448  *           SetScrollInfo   (USER32.@)
1449  * SetScrollInfo can be used to set the position, upper bound,
1450  * lower bound, and page size of a scrollbar control.
1451  *
1452  * RETURNS
1453  *    Scrollbar position
1454  *
1455  * NOTE
1456  *    For 100 lines of text to be displayed in a window of 25 lines,
1457  *  one would for instance use info->nMin=0, info->nMax=75
1458  *  (corresponding to the 76 different positions of the window on
1459  *  the text), and info->nPage=25.
1460  */
1461 INT WINAPI SetScrollInfo(
1462 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1463 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1464 const SCROLLINFO *info /* [in] Specifies what to change and new values */,
1465 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1466 {
1467     INT action;
1468     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1469
1470     if( action & SA_SSI_HIDE )
1471         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1472     else
1473     {
1474         if( action & SA_SSI_SHOW )
1475             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1476                 return retVal; /* SetWindowPos() already did the painting */
1477
1478         if( bRedraw )
1479             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1480         else if( action & SA_SSI_REPAINT_ARROWS )
1481             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1482     }
1483     return retVal;
1484 }
1485
1486 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1487                             const SCROLLINFO *info, INT *action  )
1488 {
1489     /* Update the scrollbar state and set action flags according to
1490      * what has to be done graphics wise. */
1491
1492     SCROLLBAR_INFO *infoPtr;
1493     UINT new_flags;
1494     BOOL bChangeParams = FALSE; /* don't show/hide scrollbar if params don't change */
1495
1496    *action = 0;
1497
1498     if (!(infoPtr = SCROLL_GetScrollBarInfo(hwnd, nBar))) return 0;
1499     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1500     if ((info->cbSize != sizeof(*info)) &&
1501         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1502
1503     if (TRACE_ON(scroll))
1504     {
1505         TRACE("hwnd=%p bar=%d", hwnd, nBar);
1506         if (info->fMask & SIF_PAGE) TRACE( " page=%d", info->nPage );
1507         if (info->fMask & SIF_POS) TRACE( " pos=%d", info->nPos );
1508         if (info->fMask & SIF_RANGE) TRACE( " min=%d max=%d", info->nMin, info->nMax );
1509         TRACE("\n");
1510     }
1511
1512     /* Set the page size */
1513
1514     if (info->fMask & SIF_PAGE)
1515     {
1516         if( infoPtr->page != info->nPage )
1517         {
1518             infoPtr->page = info->nPage;
1519            *action |= SA_SSI_REFRESH;
1520            bChangeParams = TRUE;
1521         }
1522     }
1523
1524     /* Set the scroll pos */
1525
1526     if (info->fMask & SIF_POS)
1527     {
1528         if( infoPtr->curVal != info->nPos )
1529         {
1530             infoPtr->curVal = info->nPos;
1531            *action |= SA_SSI_REFRESH;
1532         }
1533     }
1534
1535     /* Set the scroll range */
1536
1537     if (info->fMask & SIF_RANGE)
1538     {
1539         /* Invalid range -> range is set to (0,0) */
1540         if ((info->nMin > info->nMax) ||
1541             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1542         {
1543             infoPtr->minVal = 0;
1544             infoPtr->maxVal = 0;
1545             bChangeParams = TRUE;
1546         }
1547         else
1548         {
1549             if( infoPtr->minVal != info->nMin ||
1550                 infoPtr->maxVal != info->nMax )
1551             {
1552                 *action |= SA_SSI_REFRESH;
1553                 infoPtr->minVal = info->nMin;
1554                 infoPtr->maxVal = info->nMax;
1555                 bChangeParams = TRUE;
1556             }
1557         }
1558     }
1559
1560     /* Make sure the page size is valid */
1561
1562     if (infoPtr->page < 0) infoPtr->page = 0;
1563     else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
1564         infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
1565
1566     /* Make sure the pos is inside the range */
1567
1568     if (infoPtr->curVal < infoPtr->minVal)
1569         infoPtr->curVal = infoPtr->minVal;
1570     else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1571         infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
1572
1573     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1574                  infoPtr->page, infoPtr->curVal,
1575                  infoPtr->minVal, infoPtr->maxVal );
1576
1577     /* don't change the scrollbar state if SetScrollInfo
1578      * is just called with SIF_DISABLENOSCROLL
1579      */
1580     if(!(info->fMask & SIF_ALL)) goto done;
1581
1582     /* Check if the scrollbar should be hidden or disabled */
1583
1584     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1585     {
1586         new_flags = infoPtr->flags;
1587         if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
1588         {
1589             /* Hide or disable scroll-bar */
1590             if (info->fMask & SIF_DISABLENOSCROLL)
1591             {
1592                 new_flags = ESB_DISABLE_BOTH;
1593                *action |= SA_SSI_REFRESH;
1594             }
1595             else if ((nBar != SB_CTL) && bChangeParams)
1596             {
1597                 *action = SA_SSI_HIDE;
1598                 goto done;
1599             }
1600         }
1601         else  /* Show and enable scroll-bar */
1602         {
1603             new_flags = 0;
1604             if ((nBar != SB_CTL) && bChangeParams)
1605                 *action |= SA_SSI_SHOW;
1606         }
1607
1608         if (infoPtr->flags != new_flags) /* check arrow flags */
1609         {
1610             infoPtr->flags = new_flags;
1611            *action |= SA_SSI_REPAINT_ARROWS;
1612         }
1613     }
1614
1615 done:
1616     /* Return current position */
1617
1618     return infoPtr->curVal;
1619 }
1620
1621
1622 /*************************************************************************
1623  *           GetScrollInfo   (USER32.@)
1624  *
1625  * GetScrollInfo can be used to retrieve the position, upper bound,
1626  * lower bound, and page size of a scrollbar control.
1627  *
1628  * RETURNS STD
1629  */
1630 BOOL WINAPI GetScrollInfo(
1631 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1632 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1633 LPSCROLLINFO info /* [in/out] (fMask specifies which values to retrieve) */)
1634 {
1635     TRACE("hwnd=%p nBar=%d info=%p\n", hwnd, nBar, info);
1636
1637     /* Refer SB_CTL requests to the window */
1638     if (nBar == SB_CTL)
1639         return SendMessageA(hwnd, SBM_GETSCROLLINFO, (WPARAM)0, (LPARAM)info);
1640     else
1641         return SCROLL_GetScrollInfo(hwnd, nBar, info);
1642 }
1643
1644
1645 /*************************************************************************
1646  *           SetScrollPos   (USER32.@)
1647  *
1648  * RETURNS
1649  *    Success: Scrollbar position
1650  *    Failure: 0
1651  *
1652  * REMARKS
1653  *    Note the ambiguity when 0 is returned.  Use GetLastError
1654  *    to make sure there was an error (and to know which one).
1655  */
1656 INT WINAPI SetScrollPos(
1657 HWND hwnd /* [in] Handle of window whose scrollbar will be affected */,
1658 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */,
1659 INT nPos /* [in] New value */,
1660 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */ )
1661 {
1662     SCROLLINFO info;
1663     SCROLLBAR_INFO *infoPtr;
1664     INT oldPos;
1665
1666     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return 0;
1667     oldPos      = infoPtr->curVal;
1668     info.cbSize = sizeof(info);
1669     info.nPos   = nPos;
1670     info.fMask  = SIF_POS;
1671     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1672     return oldPos;
1673 }
1674
1675
1676 /*************************************************************************
1677  *           GetScrollPos   (USER32.@)
1678  *
1679  * RETURNS
1680  *    Success: Current position
1681  *    Failure: 0
1682  *
1683  * REMARKS
1684  *    There is ambiguity when 0 is returned.  Use GetLastError
1685  *    to make sure there was an error (and to know which one).
1686  */
1687 INT WINAPI GetScrollPos(
1688 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1689 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */)
1690 {
1691     TRACE("hwnd=%p nBar=%d\n", hwnd, nBar);
1692
1693     /* Refer SB_CTL requests to the window */
1694     if (nBar == SB_CTL)
1695         return SendMessageA(hwnd, SBM_GETPOS, (WPARAM)0, (LPARAM)0);
1696     else
1697         return SCROLL_GetScrollPos(hwnd, nBar);
1698 }
1699
1700
1701 /*************************************************************************
1702  *           SetScrollRange   (USER32.@)
1703  *
1704  * RETURNS STD
1705  */
1706 BOOL WINAPI SetScrollRange(
1707 HWND hwnd, /* [in] Handle of window whose scrollbar will be affected */
1708 INT nBar, /* [in] One of SB_HORZ, SB_VERT, or SB_CTL */
1709 INT minVal, /* [in] New minimum value */
1710 INT maxVal, /* [in] New maximum value */
1711 BOOL bRedraw /* [in] Should scrollbar be redrawn afterwards ? */)
1712 {
1713     SCROLLINFO info;
1714
1715     info.cbSize = sizeof(info);
1716     info.nMin   = minVal;
1717     info.nMax   = maxVal;
1718     info.fMask  = SIF_RANGE;
1719     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1720     return TRUE;
1721 }
1722
1723
1724 /*************************************************************************
1725  *           SCROLL_SetNCSbState
1726  *
1727  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1728  */
1729 INT SCROLL_SetNCSbState(HWND hwnd, int vMin, int vMax, int vPos,
1730                         int hMin, int hMax, int hPos)
1731 {
1732     INT vA, hA;
1733     SCROLLINFO vInfo, hInfo;
1734
1735     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1736     vInfo.nMin   = vMin;
1737     vInfo.nMax   = vMax;
1738     vInfo.nPos   = vPos;
1739     hInfo.nMin   = hMin;
1740     hInfo.nMax   = hMax;
1741     hInfo.nPos   = hPos;
1742     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1743
1744     SCROLL_SetScrollInfo( hwnd, SB_VERT, &vInfo, &vA );
1745     SCROLL_SetScrollInfo( hwnd, SB_HORZ, &hInfo, &hA );
1746
1747     if( !SCROLL_ShowScrollBar( hwnd, SB_BOTH,
1748                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1749     {
1750         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1751         if( vA & SA_SSI_REFRESH )
1752             SCROLL_RefreshScrollBar( hwnd, SB_VERT, FALSE, TRUE );
1753
1754         if( hA & SA_SSI_REFRESH )
1755             SCROLL_RefreshScrollBar( hwnd, SB_HORZ, FALSE, TRUE );
1756     }
1757     return 0;
1758 }
1759
1760
1761 /*************************************************************************
1762  *           GetScrollRange   (USER32.@)
1763  *
1764  * RETURNS STD
1765  */
1766 BOOL WINAPI GetScrollRange(
1767 HWND hwnd /* [in] Handle of window with scrollbar(s) */,
1768 INT nBar /* [in] One of SB_HORZ, SB_VERT, or SB_CTL  */,
1769 LPINT lpMin /* [out] Where to store minimum value */,
1770 LPINT lpMax /* [out] Where to store maximum value */)
1771 {
1772     TRACE("hwnd=%p nBar=%d lpMin=%p lpMax=%p\n", hwnd, nBar, lpMin, lpMax);
1773
1774     /* Refer SB_CTL requests to the window */
1775     if (nBar == SB_CTL)
1776         return SendMessageA(hwnd, SBM_GETRANGE, (WPARAM)lpMin, (LPARAM)lpMax);
1777     else
1778         return SCROLL_GetScrollRange(hwnd, nBar, lpMin, lpMax);
1779 }
1780
1781
1782 /*************************************************************************
1783  *           SCROLL_ShowScrollBar()
1784  *
1785  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1786  */
1787 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1788                              BOOL fShowH, BOOL fShowV )
1789 {
1790     LONG style = GetWindowLongW( hwnd, GWL_STYLE );
1791
1792     TRACE("hwnd=%p bar=%d horz=%d, vert=%d\n", hwnd, nBar, fShowH, fShowV );
1793
1794     switch(nBar)
1795     {
1796     case SB_CTL:
1797         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1798         return TRUE;
1799
1800     case SB_BOTH:
1801     case SB_HORZ:
1802         if (fShowH)
1803         {
1804             fShowH = !(style & WS_HSCROLL);
1805             style |= WS_HSCROLL;
1806         }
1807         else  /* hide it */
1808         {
1809             fShowH = (style & WS_HSCROLL);
1810             style &= ~WS_HSCROLL;
1811         }
1812         if( nBar == SB_HORZ ) {
1813             fShowV = FALSE;
1814             break;
1815         }
1816         /* fall through */
1817
1818     case SB_VERT:
1819         if (fShowV)
1820         {
1821             fShowV = !(style & WS_VSCROLL);
1822             style |= WS_VSCROLL;
1823         }
1824         else  /* hide it */
1825         {
1826             fShowV = (style & WS_VSCROLL);
1827             style &= ~WS_VSCROLL;
1828         }
1829         if ( nBar == SB_VERT )
1830            fShowH = FALSE;
1831         break;
1832
1833     default:
1834         return FALSE;  /* Nothing to do! */
1835     }
1836
1837     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1838     {
1839         WIN_SetStyle( hwnd, style );
1840         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1841                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1842         return TRUE;
1843     }
1844     return FALSE; /* no frame changes */
1845 }
1846
1847
1848 /*************************************************************************
1849  *           ShowScrollBar   (USER32.@)
1850  *
1851  * RETURNS STD
1852  */
1853 BOOL WINAPI ShowScrollBar(
1854 HWND hwnd, /* [in] Handle of window whose scrollbar(s) will be affected   */
1855 INT nBar, /* [in] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1856 BOOL fShow /* [in] TRUE = show, FALSE = hide  */)
1857 {
1858     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1859                                       (nBar == SB_HORZ) ? 0 : fShow );
1860     return TRUE;
1861 }
1862
1863
1864 /*************************************************************************
1865  *           EnableScrollBar   (USER32.@)
1866  */
1867 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1868 {
1869     BOOL bFineWithMe;
1870     SCROLLBAR_INFO *infoPtr;
1871
1872     TRACE("%p %d %d\n", hwnd, nBar, flags );
1873
1874     flags &= ESB_DISABLE_BOTH;
1875
1876     if (nBar == SB_BOTH)
1877     {
1878         if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, SB_VERT ))) return FALSE;
1879         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1880         {
1881             infoPtr->flags = flags;
1882             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1883         }
1884         nBar = SB_HORZ;
1885     }
1886     else
1887         bFineWithMe = TRUE;
1888
1889     if (!(infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar ))) return FALSE;
1890     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1891     infoPtr->flags = flags;
1892
1893     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1894     return TRUE;
1895 }