git.oblomov.eu Git - wine/blob - controls/scroll.c

   1 /*
   2  * Scrollbar control
   3  *
   4  * Copyright 1993 Martin Ayotte
   5  * Copyright 1994, 1996 Alexandre Julliard
   6  */
   7
   8 #include <stdlib.h>
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include "windows.h"
  12 #include "sysmetrics.h"
  13 #include "scroll.h"
  14 #include "graphics.h"
  15 #include "heap.h"
  16 #include "win.h"
  17 #include "debug.h"
  18
  19
  20 static HBITMAP32 hUpArrow = 0;
  21 static HBITMAP32 hDnArrow = 0;
  22 static HBITMAP32 hLfArrow = 0;
  23 static HBITMAP32 hRgArrow = 0;
  24 static HBITMAP32 hUpArrowD = 0;
  25 static HBITMAP32 hDnArrowD = 0;
  26 static HBITMAP32 hLfArrowD = 0;
  27 static HBITMAP32 hRgArrowD = 0;
  28 static HBITMAP32 hUpArrowI = 0;
  29 static HBITMAP32 hDnArrowI = 0;
  30 static HBITMAP32 hLfArrowI = 0;
  31 static HBITMAP32 hRgArrowI = 0;
  32
  33 #define TOP_ARROW(flags,pressed) \
  34    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  35 #define BOTTOM_ARROW(flags,pressed) \
  36    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  37 #define LEFT_ARROW(flags,pressed) \
  38    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  39 #define RIGHT_ARROW(flags,pressed) \
  40    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  41
  42
  43   /* Minimum size of the rectangle between the arrows */
  44 #define SCROLL_MIN_RECT  4
  45
  46   /* Minimum size of the thumb in pixels */
  47 #define SCROLL_MIN_THUMB 6
  48
  49   /* Overlap between arrows and thumb */
  50 #define SCROLL_ARROW_THUMB_OVERLAP 1
  51
  52   /* Delay (in ms) before first repetition when holding the button down */
  53 #define SCROLL_FIRST_DELAY   200
  54
  55   /* Delay (in ms) between scroll repetitions */
  56 #define SCROLL_REPEAT_DELAY  50
  57
  58   /* Scroll timer id */
  59 #define SCROLL_TIMER   0
  60
  61   /* Scroll-bar hit testing */
  62 enum SCROLL_HITTEST
  63 {
  64     SCROLL_NOWHERE,      /* Outside the scroll bar */
  65     SCROLL_TOP_ARROW,    /* Top or left arrow */
  66     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  67     SCROLL_THUMB,        /* Thumb rectangle */
  68     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  69     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  70 };
  71
  72  /* Thumb-tracking info */
  73 static HWND32 SCROLL_TrackingWin = 0;
  74 static INT32  SCROLL_TrackingBar = 0;
  75 static INT32  SCROLL_TrackingPos = 0;
  76 static INT32  SCROLL_TrackingVal = 0;
  77
  78 /* Is the moving thumb being displayed? */
  79 static BOOL32 SCROLL_MovingThumb = FALSE;
  80
  81 /***********************************************************************
  82  *           SCROLL_LoadBitmaps
  83  */
  84 static void SCROLL_LoadBitmaps(void)
  85 {
  86     hUpArrow  = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_UPARROW) );
  87     hDnArrow  = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_DNARROW) );
  88     hLfArrow  = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_LFARROW) );
  89     hRgArrow  = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_RGARROW) );
  90     hUpArrowD = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_UPARROWD) );
  91     hDnArrowD = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_DNARROWD) );
  92     hLfArrowD = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_LFARROWD) );
  93     hRgArrowD = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_RGARROWD) );
  94     hUpArrowI = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_UPARROWI) );
  95     hDnArrowI = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_DNARROWI) );
  96     hLfArrowI = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_LFARROWI) );
  97     hRgArrowI = LoadBitmap32A( 0, MAKEINTRESOURCE32A(OBM_RGARROWI) );
  98 }
  99
 100
 101 /***********************************************************************
 102  *           SCROLL_GetPtrScrollInfo
 103  */
 104 static SCROLLBAR_INFO *SCROLL_GetPtrScrollInfo( WND* wndPtr, INT32 nBar )
 105 {
 106     SCROLLBAR_INFO *infoPtr;
 107
 108     if (!wndPtr) return NULL;
 109     switch(nBar)
 110     {
 111         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 112         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 113         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 114         default:      return NULL;
 115     }
 116
 117     if (!infoPtr)  /* Create the info structure if needed */
 118     {
 119         if ((infoPtr = HeapAlloc( SystemHeap, 0, sizeof(SCROLLBAR_INFO) )))
 120         {
 121             infoPtr->MinVal = infoPtr->CurVal = infoPtr->Page = 0;
 122             infoPtr->MaxVal = 100;
 123             infoPtr->flags  = ESB_ENABLE_BOTH;
 124             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 125             else wndPtr->pVScroll = infoPtr;
 126         }
 127         if (!hUpArrow) SCROLL_LoadBitmaps();
 128     }
 129     return infoPtr;
 130 }
 131
 132
 133 /***********************************************************************
 134  *           SCROLL_GetScrollInfo
 135  */
 136 static SCROLLBAR_INFO *SCROLL_GetScrollInfo( HWND32 hwnd, INT32 nBar )
 137 {
 138    WND *wndPtr = WIN_FindWndPtr( hwnd );
 139    return SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 140 }
 141
 142
 143 /***********************************************************************
 144  *           SCROLL_GetScrollBarRect
 145  *
 146  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 147  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 148  * 'arrowSize' returns the width or height of an arrow (depending on
 149  * the orientation of the scrollbar), 'thumbSize' returns the size of
 150  * the thumb, and 'thumbPos' returns the position of the thumb
 151  * relative to the left or to the top.
 152  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 153  */
 154 static BOOL32 SCROLL_GetScrollBarRect( HWND32 hwnd, INT32 nBar, RECT32 *lprect,
 155                                        INT32 *arrowSize, INT32 *thumbSize,
 156                                        INT32 *thumbPos )
 157 {
 158     INT32 pixels;
 159     BOOL32 vertical;
 160     WND *wndPtr = WIN_FindWndPtr( hwnd );
 161
 162     switch(nBar)
 163     {
 164       case SB_HORZ:
 165         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 166         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 167         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 168         lprect->bottom = lprect->top + SYSMETRICS_CYHSCROLL;
 169         if(wndPtr->dwStyle & WS_BORDER) {
 170           lprect->left--;
 171           lprect->right++;
 172         } else if(wndPtr->dwStyle & WS_VSCROLL)
 173           lprect->right++;
 174         vertical = FALSE;
 175         break;
 176
 177       case SB_VERT:
 178         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 179         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 180         lprect->right  = lprect->left + SYSMETRICS_CXVSCROLL;
 181         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 182         if(wndPtr->dwStyle & WS_BORDER) {
 183           lprect->top--;
 184           lprect->bottom++;
 185         } else if(wndPtr->dwStyle & WS_HSCROLL)
 186           lprect->bottom++;
 187         vertical = TRUE;
 188         break;
 189
 190       case SB_CTL:
 191         GetClientRect32( hwnd, lprect );
 192         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 193         break;
 194
 195     default:
 196         return FALSE;
 197     }
 198
 199     if (vertical) pixels = lprect->bottom - lprect->top;
 200     else pixels = lprect->right - lprect->left;
 201
 202     if (pixels <= 2*SYSMETRICS_CXVSCROLL + SCROLL_MIN_RECT)
 203     {
 204         if (pixels > SCROLL_MIN_RECT)
 205             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 206         else
 207             *arrowSize = 0;
 208         *thumbPos = *thumbSize = 0;
 209     }
 210     else
 211     {
 212         SCROLLBAR_INFO *info = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 213
 214         *arrowSize = SYSMETRICS_CXVSCROLL;
 215         pixels -= (2 * (SYSMETRICS_CXVSCROLL - SCROLL_ARROW_THUMB_OVERLAP));
 216
 217         if (info->Page)
 218         {
 219             *thumbSize = pixels * info->Page / (info->MaxVal-info->MinVal+1);
 220             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 221         }
 222         else *thumbSize = SYSMETRICS_CXVSCROLL;
 223
 224         if (((pixels -= *thumbSize ) < 0) ||
 225             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 226         {
 227             /* Rectangle too small or scrollbar disabled -> no thumb */
 228             *thumbPos = *thumbSize = 0;
 229         }
 230         else
 231         {
 232             INT32 max = info->MaxVal - MAX( info->Page-1, 0 );
 233             if (info->MinVal >= max)
 234                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 235             else
 236                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 237                  + pixels * (info->CurVal-info->MinVal) / (max - info->MinVal);
 238         }
 239     }
 240     return vertical;
 241 }
 242
 243
 244 /***********************************************************************
 245  *           SCROLL_GetThumbVal
 246  *
 247  * Compute the current scroll position based on the thumb position in pixels
 248  * from the top of the scroll-bar.
 249  */
 250 static UINT32 SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT32 *rect,
 251                                   BOOL32 vertical, INT32 pos )
 252 {
 253     INT32 thumbSize;
 254     INT32 pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 255
 256     if ((pixels -= 2*(SYSMETRICS_CXVSCROLL - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 257         return infoPtr->MinVal;
 258
 259     if (infoPtr->Page)
 260     {
 261         thumbSize = pixels * infoPtr->Page/(infoPtr->MaxVal-infoPtr->MinVal+1);
 262         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 263     }
 264     else thumbSize = SYSMETRICS_CXVSCROLL;
 265
 266     if ((pixels -= thumbSize) <= 0) return infoPtr->MinVal;
 267
 268     pos = MAX( 0, pos - (SYSMETRICS_CXVSCROLL - SCROLL_ARROW_THUMB_OVERLAP) );
 269     if (pos > pixels) pos = pixels;
 270
 271     if (!infoPtr->Page) pos *= infoPtr->MaxVal - infoPtr->MinVal;
 272     else pos *= infoPtr->MaxVal - infoPtr->MinVal - infoPtr->Page + 1;
 273     return infoPtr->MinVal + ((pos + pixels / 2) / pixels);
 274 }
 275
 276
 277 /***********************************************************************
 278  *           SCROLL_HitTest
 279  *
 280  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 281  */
 282 static enum SCROLL_HITTEST SCROLL_HitTest( HWND32 hwnd, INT32 nBar,
 283                                            POINT32 pt )
 284 {
 285     INT32 arrowSize, thumbSize, thumbPos;
 286     RECT32 rect;
 287
 288     BOOL32 vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 289                                            &arrowSize, &thumbSize, &thumbPos );
 290     if (!PtInRect32( &rect, pt )) return SCROLL_NOWHERE;
 291
 292     if (vertical)
 293     {
 294         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 295         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 296         if (!thumbPos) return SCROLL_TOP_RECT;
 297         pt.y -= rect.top;
 298         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 299         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 300         return SCROLL_THUMB;
 301     }
 302     else  /* horizontal */
 303     {
 304         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 305         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 306         if (!thumbPos) return SCROLL_TOP_RECT;
 307         pt.x -= rect.left;
 308         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 309         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 310         return SCROLL_THUMB;
 311     }
 312 }
 313
 314
 315 /***********************************************************************
 316  *           SCROLL_DrawArrows
 317  *
 318  * Draw the scroll bar arrows.
 319  */
 320 static void SCROLL_DrawArrows( HDC32 hdc, SCROLLBAR_INFO *infoPtr,
 321                                RECT32 *rect, INT32 arrowSize, BOOL32 vertical,
 322                                BOOL32 top_pressed, BOOL32 bottom_pressed )
 323 {
 324     HDC32 hdcMem = CreateCompatibleDC32( hdc );
 325     HBITMAP32 hbmpPrev = SelectObject32( hdcMem, vertical ?
 326                                     TOP_ARROW(infoPtr->flags, top_pressed)
 327                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 328     SetStretchBltMode32( hdc, STRETCH_DELETESCANS );
 329     StretchBlt32( hdc, rect->left, rect->top,
 330                   vertical ? rect->right-rect->left : arrowSize,
 331                   vertical ? arrowSize : rect->bottom-rect->top,
 332                   hdcMem, 0, 0,
 333                   SYSMETRICS_CXVSCROLL, SYSMETRICS_CYHSCROLL,
 334                   SRCCOPY );
 335
 336     SelectObject32( hdcMem, vertical ?
 337                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 338                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 339     if (vertical)
 340         StretchBlt32( hdc, rect->left, rect->bottom - arrowSize,
 341                       rect->right - rect->left, arrowSize,
 342                       hdcMem, 0, 0,
 343                       SYSMETRICS_CXVSCROLL, SYSMETRICS_CYHSCROLL,
 344                       SRCCOPY );
 345     else
 346         StretchBlt32( hdc, rect->right - arrowSize, rect->top,
 347                       arrowSize, rect->bottom - rect->top,
 348                       hdcMem, 0, 0,
 349                       SYSMETRICS_CXVSCROLL, SYSMETRICS_CYHSCROLL,
 350                       SRCCOPY );
 351     SelectObject32( hdcMem, hbmpPrev );
 352     DeleteDC32( hdcMem );
 353 }
 354
 355
 356 /***********************************************************************
 357  *           SCROLL_DrawMovingThumb
 358  *
 359  * Draw the moving thumb rectangle.
 360  */
 361 static void SCROLL_DrawMovingThumb( HDC32 hdc, RECT32 *rect, BOOL32 vertical,
 362                                     INT32 arrowSize, INT32 thumbSize )
 363 {
 364     RECT32 r = *rect;
 365     if (vertical)
 366     {
 367         r.top += SCROLL_TrackingPos;
 368         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 369             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 370         if (r.top + thumbSize >
 371                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 372             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 373                                                                   - thumbSize;
 374         r.bottom = r.top + thumbSize;
 375     }
 376     else
 377     {
 378         r.left += SCROLL_TrackingPos;
 379         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 380             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 381         if (r.left + thumbSize >
 382                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 383             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 384                                                                   - thumbSize;
 385         r.right = r.left + thumbSize;
 386     }
 387     DrawFocusRect32( hdc, &r );
 388     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 389 }
 390
 391
 392 /***********************************************************************
 393  *           SCROLL_DrawInterior
 394  *
 395  * Draw the scroll bar interior (everything except the arrows).
 396  */
 397 static void SCROLL_DrawInterior( HWND32 hwnd, HDC32 hdc, INT32 nBar,
 398                                  RECT32 *rect, INT32 arrowSize,
 399                                  INT32 thumbSize, INT32 thumbPos,
 400                                  UINT32 flags, BOOL32 vertical,
 401                                  BOOL32 top_selected, BOOL32 bottom_selected )
 402 {
 403     RECT32 r;
 404
 405       /* Select the correct brush and pen */
 406
 407     SelectObject32( hdc, GetSysColorPen32(COLOR_WINDOWFRAME) );
 408     if ((flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 409     {
 410           /* This ought to be the color of the parent window */
 411         SelectObject32( hdc, GetSysColorBrush32(COLOR_WINDOW) );
 412     }
 413     else
 414     {
 415         if (nBar == SB_CTL)  /* Only scrollbar controls send WM_CTLCOLOR */
 416         {
 417             HBRUSH32 hbrush = SendMessage32A(GetParent32(hwnd),
 418                                              WM_CTLCOLORSCROLLBAR, hdc, hwnd );
 419             SelectObject32( hdc, hbrush );
 420         }
 421         else SelectObject32( hdc, GetSysColorBrush32(COLOR_SCROLLBAR) );
 422     }
 423
 424       /* Calculate the scroll rectangle */
 425
 426     r = *rect;
 427     if (vertical)
 428     {
 429         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 430         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 431     }
 432     else
 433     {
 434         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 435         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 436     }
 437
 438       /* Draw the scroll bar frame */
 439
 440     GRAPH_DrawRectangle( hdc, r.left, r.top, r.right - r.left, r.bottom - r.top, 0);
 441
 442       /* Draw the scroll rectangles and thumb */
 443
 444     if (!thumbPos)  /* No thumb to draw */
 445     {
 446         PatBlt32( hdc, r.left+1, r.top+1, r.right - r.left - 2,
 447                   r.bottom - r.top - 2, PATCOPY );
 448         return;
 449     }
 450
 451     if (vertical)
 452     {
 453         PatBlt32( hdc, r.left + 1, r.top + 1,
 454                   r.right - r.left - 2,
 455                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - 1,
 456                   top_selected ? 0x0f0000 : PATCOPY );
 457         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 458         PatBlt32( hdc, r.left + 1, r.top + thumbSize,
 459                   r.right - r.left - 2,
 460                   r.bottom - r.top - thumbSize - 1,
 461                   bottom_selected ? 0x0f0000 : PATCOPY );
 462         r.bottom = r.top + thumbSize;
 463     }
 464     else  /* horizontal */
 465     {
 466         PatBlt32( hdc, r.left + 1, r.top + 1,
 467                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - 1,
 468                   r.bottom - r.top - 2,
 469                   top_selected ? 0x0f0000 : PATCOPY );
 470         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 471         PatBlt32( hdc, r.left + thumbSize, r.top + 1,
 472                   r.right - r.left - thumbSize - 1,
 473                   r.bottom - r.top - 2,
 474                   bottom_selected ? 0x0f0000 : PATCOPY );
 475         r.right = r.left + thumbSize;
 476     }
 477
 478       /* Draw the thumb */
 479
 480     SelectObject32( hdc, GetSysColorBrush32(COLOR_BTNFACE) );
 481     Rectangle32( hdc, r.left, r.top, r.right, r.bottom );
 482     InflateRect32( &r, -1, -1 );
 483     GRAPH_DrawReliefRect( hdc, &r, 1, 2, FALSE );
 484     if (SCROLL_MovingThumb &&
 485         (SCROLL_TrackingWin == hwnd) &&
 486         (SCROLL_TrackingBar == nBar))
 487     {
 488         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 489         SCROLL_MovingThumb = TRUE;
 490     }
 491 }
 492
 493
 494 /***********************************************************************
 495  *           SCROLL_DrawScrollBar
 496  *
 497  * Redraw the whole scrollbar.
 498  */
 499 void SCROLL_DrawScrollBar( HWND32 hwnd, HDC32 hdc, INT32 nBar, BOOL32 arrows )
 500 {
 501     INT32 arrowSize, thumbSize, thumbPos;
 502     RECT32 rect;
 503     BOOL32 vertical;
 504     WND *wndPtr = WIN_FindWndPtr( hwnd );
 505     SCROLLBAR_INFO *infoPtr = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 506
 507     if (!wndPtr || !infoPtr ||
 508         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 509         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) return;
 510
 511     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 512                                         &arrowSize, &thumbSize, &thumbPos );
 513
 514       /* Draw the arrows */
 515
 516     if (arrows && arrowSize) SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize,
 517                                                 vertical, FALSE, FALSE );
 518
 519     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 520                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 521 }
 522
 523
 524 /***********************************************************************
 525  *           SCROLL_RefreshScrollBar
 526  *
 527  * Repaint the scroll bar interior after a SetScrollRange() or
 528  * SetScrollPos() call.
 529  */
 530 static void SCROLL_RefreshScrollBar( HWND32 hwnd, INT32 nBar, BOOL32 arrows )
 531 {
 532     HDC32 hdc = GetDCEx32( hwnd, 0,
 533                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 534     if (!hdc) return;
 535     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows );
 536     ReleaseDC32( hwnd, hdc );
 537 }
 538
 539
 540 /***********************************************************************
 541  *           SCROLL_HandleKbdEvent
 542  *
 543  * Handle a keyboard event (only for SB_CTL scrollbars).
 544  */
 545 static void SCROLL_HandleKbdEvent( HWND32 hwnd, WPARAM32 wParam )
 546 {
 547     WND *wndPtr = WIN_FindWndPtr( hwnd );
 548     WPARAM32 msg;
 549
 550     switch(wParam)
 551     {
 552     case VK_PRIOR: msg = SB_PAGEUP; break;
 553     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 554     case VK_HOME:  msg = SB_TOP; break;
 555     case VK_END:   msg = SB_BOTTOM; break;
 556     case VK_UP:    msg = SB_LINEUP; break;
 557     case VK_DOWN:  msg = SB_LINEDOWN; break;
 558     default:
 559         return;
 560     }
 561     SendMessage32A( GetParent32(hwnd),
 562                     (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 563                     msg, hwnd );
 564 }
 565
 566
 567 /***********************************************************************
 568  *           SCROLL_HandleScrollEvent
 569  *
 570  * Handle a mouse or timer event for the scrollbar.
 571  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 572  * windows coordinates.
 573  */
 574 void SCROLL_HandleScrollEvent( HWND32 hwnd, INT32 nBar, UINT32 msg, POINT32 pt)
 575 {
 576       /* Previous mouse position for timer events */
 577     static POINT32 prevPt;
 578       /* Hit test code of the last button-down event */
 579     static enum SCROLL_HITTEST trackHitTest;
 580       /* Thumb position when tracking started. */
 581     static UINT32 trackThumbPos;
 582       /* Position in the scroll-bar of the last button-down event. */
 583     static INT32 lastClickPos;
 584       /* Position in the scroll-bar of the last mouse event. */
 585     static INT32 lastMousePos;
 586
 587     enum SCROLL_HITTEST hittest;
 588     HWND32 hwndOwner, hwndCtl;
 589     BOOL32 vertical;
 590     INT32 arrowSize, thumbSize, thumbPos;
 591     RECT32 rect;
 592     HDC32 hdc;
 593
 594     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 595     if (!infoPtr) return;
 596     if ((trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN)) return;
 597
 598     hdc = GetDCEx32( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 599     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 600                                         &arrowSize, &thumbSize, &thumbPos );
 601     hwndOwner = (nBar == SB_CTL) ? GetParent32(hwnd) : hwnd;
 602     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 603
 604     switch(msg)
 605     {
 606       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 607           trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt );
 608           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 609           lastMousePos  = lastClickPos;
 610           trackThumbPos = thumbPos;
 611           prevPt = pt;
 612           SetCapture32( hwnd );
 613           if (nBar == SB_CTL) SetFocus32( hwnd );
 614           break;
 615
 616       case WM_MOUSEMOVE:
 617           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 618           prevPt = pt;
 619           break;
 620
 621       case WM_LBUTTONUP:
 622           hittest = SCROLL_NOWHERE;
 623           ReleaseCapture();
 624           break;
 625
 626       case WM_SYSTIMER:
 627           pt = prevPt;
 628           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 629           break;
 630
 631       default:
 632           return;  /* Should never happen */
 633     }
 634
 635     TRACE(scroll, "Event: hwnd=%04x bar=%d msg=%x pt=%d,%d hit=%d\n",
 636                  hwnd, nBar, msg, pt.x, pt.y, hittest );
 637
 638     switch(trackHitTest)
 639     {
 640     case SCROLL_NOWHERE:  /* No tracking in progress */
 641         break;
 642
 643     case SCROLL_TOP_ARROW:
 644         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 645                            (hittest == trackHitTest), FALSE );
 646         if (hittest == trackHitTest)
 647         {
 648             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 649             {
 650                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 651                                 SB_LINEUP, hwndCtl );
 652                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 653                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 654                                   (TIMERPROC32)0 );
 655             }
 656         }
 657         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 658         break;
 659
 660     case SCROLL_TOP_RECT:
 661         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 662                              thumbPos, infoPtr->flags, vertical,
 663                              (hittest == trackHitTest), FALSE );
 664         if (hittest == trackHitTest)
 665         {
 666             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 667             {
 668                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 669                                 SB_PAGEUP, hwndCtl );
 670                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 671                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 672                                   (TIMERPROC32)0 );
 673             }
 674         }
 675         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 676         break;
 677
 678     case SCROLL_THUMB:
 679         if (msg == WM_LBUTTONDOWN)
 680         {
 681             SCROLL_TrackingWin = hwnd;
 682             SCROLL_TrackingBar = nBar;
 683             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
 684             SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 685         }
 686         else if (msg == WM_LBUTTONUP)
 687         {
 688             SCROLL_TrackingWin = 0;
 689             SCROLL_MovingThumb = FALSE;
 690             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 691                                  thumbPos, infoPtr->flags, vertical,
 692                                  FALSE, FALSE );
 693         }
 694         else  /* WM_MOUSEMOVE */
 695         {
 696             UINT32 pos;
 697
 698             if (!PtInRect32( &rect, pt )) pos = lastClickPos;
 699             else pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 700             if (pos != lastMousePos)
 701             {
 702                 SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 703                                         arrowSize, thumbSize );
 704                 lastMousePos = pos;
 705                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
 706                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
 707                                                          vertical,
 708                                                          SCROLL_TrackingPos );
 709                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 710                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
 711                                 hwndCtl );
 712                 SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 713                                         arrowSize, thumbSize );
 714             }
 715         }
 716         break;
 717
 718     case SCROLL_BOTTOM_RECT:
 719         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 720                              thumbPos, infoPtr->flags, vertical,
 721                              FALSE, (hittest == trackHitTest) );
 722         if (hittest == trackHitTest)
 723         {
 724             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 725             {
 726                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 727                                 SB_PAGEDOWN, hwndCtl );
 728                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 729                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 730                                   (TIMERPROC32)0 );
 731             }
 732         }
 733         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 734         break;
 735
 736     case SCROLL_BOTTOM_ARROW:
 737         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 738                            FALSE, (hittest == trackHitTest) );
 739         if (hittest == trackHitTest)
 740         {
 741             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 742             {
 743                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 744                                 SB_LINEDOWN, hwndCtl );
 745                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 746                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 747                                   (TIMERPROC32)0 );
 748             }
 749         }
 750         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 751         break;
 752     }
 753
 754     if (msg == WM_LBUTTONUP)
 755     {
 756         if (trackHitTest == SCROLL_THUMB)
 757         {
 758             UINT32 val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 759                                  trackThumbPos + lastMousePos - lastClickPos );
 760             SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 761                             MAKEWPARAM( SB_THUMBPOSITION, val ), hwndCtl );
 762         }
 763         else
 764             SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 765                             SB_ENDSCROLL, hwndCtl );
 766         trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
 767     }
 768
 769     ReleaseDC32( hwnd, hdc );
 770 }
 771
 772
 773 /***********************************************************************
 774  *           ScrollBarWndProc
 775  */
 776 LRESULT WINAPI ScrollBarWndProc( HWND32 hwnd, UINT32 message, WPARAM32 wParam,
 777                                  LPARAM lParam )
 778 {
 779     switch(message)
 780     {
 781     case WM_CREATE:
 782         {
 783             CREATESTRUCT32A *lpCreat = (CREATESTRUCT32A *)lParam;
 784             if (lpCreat->style & SBS_SIZEBOX)
 785             {
 786                 FIXME(scroll, "Unimplemented style SBS_SIZEBOX.\n" );
 787                 return 0;
 788             }
 789
 790             if (lpCreat->style & SBS_VERT)
 791             {
 792                 if (lpCreat->style & SBS_LEFTALIGN)
 793                     MoveWindow32( hwnd, lpCreat->x, lpCreat->y,
 794                                   SYSMETRICS_CXVSCROLL+1, lpCreat->cy, FALSE );
 795                 else if (lpCreat->style & SBS_RIGHTALIGN)
 796                     MoveWindow32( hwnd,
 797                                   lpCreat->x+lpCreat->cx-SYSMETRICS_CXVSCROLL-1,
 798                                   lpCreat->y,
 799                                   SYSMETRICS_CXVSCROLL+1, lpCreat->cy, FALSE );
 800             }
 801             else  /* SBS_HORZ */
 802             {
 803                 if (lpCreat->style & SBS_TOPALIGN)
 804                     MoveWindow32( hwnd, lpCreat->x, lpCreat->y,
 805                                   lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 806                 else if (lpCreat->style & SBS_BOTTOMALIGN)
 807                     MoveWindow32( hwnd,
 808                                   lpCreat->x,
 809                                   lpCreat->y+lpCreat->cy-SYSMETRICS_CYHSCROLL-1,
 810                                   lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 811             }
 812         }
 813         if (!hUpArrow) SCROLL_LoadBitmaps();
 814         TRACE(scroll, "ScrollBar creation, hwnd=%04x\n", hwnd );
 815         return 0;
 816
 817     case WM_LBUTTONDOWN:
 818     case WM_LBUTTONUP:
 819     case WM_MOUSEMOVE:
 820     case WM_SYSTIMER:
 821         {
 822             POINT32 pt;
 823             CONV_POINT16TO32( (POINT16 *)&lParam, &pt );
 824             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
 825         }
 826         break;
 827
 828     case WM_KEYDOWN:
 829         SCROLL_HandleKbdEvent( hwnd, wParam );
 830         break;
 831
 832     case WM_ERASEBKGND:
 833          return 1;
 834
 835     case WM_GETDLGCODE:
 836          return DLGC_WANTARROWS; /* Windows returns this value */
 837
 838     case WM_PAINT:
 839         {
 840             PAINTSTRUCT32 ps;
 841             HDC32 hdc = BeginPaint32( hwnd, &ps );
 842             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE );
 843             EndPaint32( hwnd, &ps );
 844         }
 845         break;
 846
 847     case SBM_SETPOS16:
 848     case SBM_SETPOS32:
 849         return SetScrollPos32( hwnd, SB_CTL, wParam, (BOOL32)lParam );
 850
 851     case SBM_GETPOS16:
 852     case SBM_GETPOS32:
 853         return GetScrollPos32( hwnd, SB_CTL );
 854
 855     case SBM_SETRANGE16:
 856         SetScrollRange32( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
 857                           wParam  /* FIXME: Is this correct? */ );
 858         return 0;
 859
 860     case SBM_SETRANGE32:
 861         SetScrollRange32( hwnd, SB_CTL, wParam, lParam, FALSE );
 862         return 0;  /* FIXME: return previous position */
 863
 864     case SBM_GETRANGE16:
 865         FIXME(scroll, "don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
 866         return 0;
 867
 868     case SBM_GETRANGE32:
 869         GetScrollRange32( hwnd, SB_CTL, (LPINT32)wParam, (LPINT32)lParam );
 870         return 0;
 871
 872     case SBM_ENABLE_ARROWS16:
 873     case SBM_ENABLE_ARROWS32:
 874         return EnableScrollBar32( hwnd, SB_CTL, wParam );
 875
 876     case SBM_SETRANGEREDRAW32:
 877         SetScrollRange32( hwnd, SB_CTL, wParam, lParam, TRUE );
 878         return 0;  /* FIXME: return previous position */
 879
 880     case SBM_SETSCROLLINFO32:
 881         return SetScrollInfo32( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
 882
 883     case SBM_GETSCROLLINFO32:
 884         return GetScrollInfo32( hwnd, SB_CTL, (SCROLLINFO *)lParam );
 885
 886     case 0x00e5:
 887     case 0x00e7:
 888     case 0x00e8:
 889     case 0x00eb:
 890     case 0x00ec:
 891     case 0x00ed:
 892     case 0x00ee:
 893     case 0x00ef:
 894         ERR(scroll, "unknown Win32 msg %04x wp=%08x lp=%08lx\n",
 895                     message, wParam, lParam );
 896         break;
 897
 898     default:
 899         if (message >= WM_USER)
 900             WARN(scroll, "unknown msg %04x wp=%04x lp=%08lx\n",
 901                          message, wParam, lParam );
 902         return DefWindowProc32A( hwnd, message, wParam, lParam );
 903     }
 904     return 0;
 905 }
 906
 907
 908 /*************************************************************************
 909  *           SetScrollInfo16   (USER.475)
 910  */
 911 INT16 WINAPI SetScrollInfo16( HWND16 hwnd, INT16 nBar, const SCROLLINFO *info,
 912                               BOOL16 bRedraw )
 913 {
 914     return (INT16)SetScrollInfo32( hwnd, nBar, info, bRedraw );
 915 }
 916
 917
 918 /*************************************************************************
 919  *           SetScrollInfo32   (USER32.501)
 920  * SetScrollInfo32 can be used to set the position, upper bound,
 921  * lower bound, and page size of a scrollbar control.
 922  *
 923  * RETURNS
 924  *    Scrollbar position
 925  *
 926  * NOTE
 927  *    For 100 lines of text to be displayed in a window of 25 lines,
 928  *  one would for instance use info->nMin=0, info->nMax=75
 929  *  (corresponding to the 76 different positions of the window on
 930  *  the text), and info->nPage=25.
 931  */
 932 INT32 WINAPI SetScrollInfo32(
 933 HWND32 hwnd /* [I] Handle of window whose scrollbar will be affected */,
 934 INT32 nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
 935 const SCROLLINFO *info /* [I] Specifies what to change and new values */,
 936 BOOL32 bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
 937 {
 938     SCROLLBAR_INFO *infoPtr;
 939     UINT32 new_flags;
 940     BOOL32 repaint_arrows = FALSE;
 941     dbg_decl_str(scroll, 256);
 942
 943     if (!(infoPtr = SCROLL_GetScrollInfo(hwnd, nBar))) return 0;
 944     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
 945     if ((info->cbSize != sizeof(*info)) &&
 946         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
 947
 948     /* Set the page size */
 949
 950     if (info->fMask & SIF_PAGE)
 951     {
 952         dsprintf(scroll, " page=%d", info->nPage );
 953         infoPtr->Page = info->nPage;
 954     }
 955
 956     /* Set the scroll pos */
 957
 958     if (info->fMask & SIF_POS)
 959     {
 960         dsprintf(scroll, " pos=%d", info->nPos );
 961         infoPtr->CurVal = info->nPos;
 962     }
 963
 964     /* Set the scroll range */
 965
 966     if (info->fMask & SIF_RANGE)
 967     {
 968         dsprintf(scroll, " min=%d max=%d", info->nMin, info->nMax );
 969
 970         /* Invalid range -> range is set to (0,0) */
 971         if ((info->nMin > info->nMax) ||
 972             ((UINT32)(info->nMax - info->nMin) >= 0x80000000))
 973         {
 974             infoPtr->MinVal = 0;
 975             infoPtr->MaxVal = 0;
 976         }
 977         else
 978         {
 979             infoPtr->MinVal = info->nMin;
 980             infoPtr->MaxVal = info->nMax;
 981         }
 982     }
 983
 984     TRACE(scroll, "hwnd=%04x bar=%d %s\n",
 985                     hwnd, nBar, dbg_str(scroll));
 986
 987     /* Make sure the page size is valid */
 988
 989     if (infoPtr->Page < 0) infoPtr->Page = 0;
 990     else if (infoPtr->Page > infoPtr->MaxVal - infoPtr->MinVal + 1 )
 991         infoPtr->Page = infoPtr->MaxVal - infoPtr->MinVal + 1;
 992
 993     /* Make sure the pos is inside the range */
 994
 995     if (infoPtr->CurVal < infoPtr->MinVal)
 996         infoPtr->CurVal = infoPtr->MinVal;
 997     else if (infoPtr->CurVal > infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 ))
 998         infoPtr->CurVal = infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 );
 999
1000     TRACE(scroll, "    new values: page=%d pos=%d min=%d max=%d\n",
1001                  infoPtr->Page, infoPtr->CurVal,
1002                  infoPtr->MinVal, infoPtr->MaxVal );
1003
1004     /* Check if the scrollbar should be hidden or disabled */
1005
1006     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1007     {
1008         new_flags = infoPtr->flags;
1009         if (infoPtr->MinVal >= infoPtr->MaxVal - MAX( infoPtr->Page-1, 0 ))
1010         {
1011             /* Hide or disable scroll-bar */
1012             if (info->fMask & SIF_DISABLENOSCROLL)
1013                 new_flags = ESB_DISABLE_BOTH;
1014             else if (nBar != SB_CTL)
1015             {
1016                 ShowScrollBar32( hwnd, nBar, FALSE );
1017                 bRedraw = FALSE;  /* No need to repaint anything */
1018             }
1019         }
1020         else  /* Show and enable scroll-bar */
1021         {
1022             new_flags = 0;
1023             if (nBar != SB_CTL) ShowScrollBar32( hwnd, nBar, TRUE );
1024         }
1025
1026         if (infoPtr->flags != new_flags)
1027         {
1028             infoPtr->flags = new_flags;
1029             repaint_arrows = TRUE;
1030         }
1031     }
1032
1033     if (bRedraw || repaint_arrows)
1034         SCROLL_RefreshScrollBar( hwnd, nBar, repaint_arrows );
1035
1036     /* Return current position */
1037
1038     return infoPtr->CurVal;
1039 }
1040
1041
1042 /*************************************************************************
1043  *           GetScrollInfo16   (USER.476)
1044  */
1045 BOOL16 WINAPI GetScrollInfo16( HWND16 hwnd, INT16 nBar, LPSCROLLINFO info )
1046 {
1047     return GetScrollInfo32( hwnd, nBar, info );
1048 }
1049
1050
1051 /*************************************************************************
1052  *           GetScrollInfo32   (USER32.284)
1053  * GetScrollInfo32 can be used to retrieve the position, upper bound,
1054  * lower bound, and page size of a scrollbar control.
1055  *
1056  * RETURNS STD
1057  */
1058 BOOL32 WINAPI GetScrollInfo32(
1059   HWND32 hwnd /* [I] Handle of window */ ,
1060   INT32 nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1061   LPSCROLLINFO info /* [IO] (info.fMask [I] specifies which values are to retrieve) */)
1062 {
1063     SCROLLBAR_INFO *infoPtr;
1064
1065     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1066     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return FALSE;
1067     if ((info->cbSize != sizeof(*info)) &&
1068         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return FALSE;
1069
1070     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->Page;
1071     if (info->fMask & SIF_POS) info->nPos = infoPtr->CurVal;
1072     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1073         info->nTrackPos = (SCROLL_TrackingWin==hwnd) ? SCROLL_TrackingVal : 0;
1074     if (info->fMask & SIF_RANGE)
1075     {
1076         info->nMin = infoPtr->MinVal;
1077         info->nMax = infoPtr->MaxVal;
1078     }
1079     return (info->fMask & SIF_ALL) != 0;
1080 }
1081
1082
1083 /*************************************************************************
1084  *           SetScrollPos16   (USER.62)
1085  */
1086 INT16 WINAPI SetScrollPos16( HWND16 hwnd, INT16 nBar, INT16 nPos,
1087                              BOOL16 bRedraw )
1088 {
1089     return (INT16)SetScrollPos32( hwnd, nBar, nPos, bRedraw );
1090 }
1091
1092
1093 /*************************************************************************
1094  *           SetScrollPos32   (USER32.502)
1095  *
1096  * RETURNS
1097  *    Success: Scrollbar position
1098  *    Failure: 0
1099  *
1100  * REMARKS
1101  *    Note the ambiguity when 0 is returned.  Use GetLastError
1102  *    to make sure there was an error (and to know which one).
1103  */
1104 INT32 WINAPI SetScrollPos32(
1105 HWND32 hwnd /* [I] Handle of window whose scrollbar will be affected */,
1106 INT32 nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1107 INT32 nPos /* [I] New value */,
1108 BOOL32 bRedraw /* [I] Should scrollbar be redrawn afterwards ? */ )
1109 {
1110     SCROLLINFO info;
1111     SCROLLBAR_INFO *infoPtr;
1112     INT32 oldPos;
1113
1114     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1115     oldPos      = infoPtr->CurVal;
1116     info.cbSize = sizeof(info);
1117     info.nPos   = nPos;
1118     info.fMask  = SIF_POS;
1119     SetScrollInfo32( hwnd, nBar, &info, bRedraw );
1120     return oldPos;
1121 }
1122
1123
1124 /*************************************************************************
1125  *           GetScrollPos16   (USER.63)
1126  */
1127 INT16 WINAPI GetScrollPos16( HWND16 hwnd, INT16 nBar )
1128 {
1129     return (INT16)GetScrollPos32( hwnd, nBar );
1130 }
1131
1132
1133 /*************************************************************************
1134  *           GetScrollPos32   (USER32.285)
1135  *
1136  * RETURNS
1137  *    Success: Current position
1138  *    Failure: 0
1139  *
1140  * REMARKS
1141  *    Note the ambiguity when 0 is returned.  Use GetLastError
1142  *    to make sure there was an error (and to know which one).
1143  */
1144 INT32 WINAPI GetScrollPos32(
1145 HWND32 hwnd, /* [I] Handle of window */
1146 INT32 nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */)
1147 {
1148     SCROLLBAR_INFO *infoPtr;
1149
1150     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1151     return infoPtr->CurVal;
1152 }
1153
1154
1155 /*************************************************************************
1156  *           SetScrollRange16   (USER.64)
1157  */
1158 void WINAPI SetScrollRange16( HWND16 hwnd, INT16 nBar,
1159                               INT16 MinVal, INT16 MaxVal, BOOL16 bRedraw )
1160 {
1161     /* Invalid range -> range is set to (0,0) */
1162     if ((INT32)MaxVal - (INT32)MinVal > 0x7fff) MinVal = MaxVal = 0;
1163     SetScrollRange32( hwnd, nBar, MinVal, MaxVal, bRedraw );
1164 }
1165
1166
1167 /*************************************************************************
1168  *           SetScrollRange32   (USER32.503)
1169  *
1170  * RETURNS STD
1171  */
1172 BOOL32 WINAPI SetScrollRange32(
1173 HWND32 hwnd, /* [I] Handle of window whose scrollbar will be affected */
1174 INT32 nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */
1175 INT32 MinVal, /* [I] New minimum value */
1176 INT32 MaxVal, /* [I] New maximum value */
1177 BOOL32 bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
1178 {
1179     SCROLLINFO info;
1180
1181     info.cbSize = sizeof(info);
1182     info.nMin   = MinVal;
1183     info.nMax   = MaxVal;
1184     info.fMask  = SIF_RANGE;
1185     SetScrollInfo32( hwnd, nBar, &info, bRedraw );
1186     return TRUE;
1187 }
1188
1189
1190 /*************************************************************************
1191  *           SCROLL_SetNCSbState
1192  *
1193  * This is for CalcChildScroll in windows/mdi.c
1194  */
1195 DWORD SCROLL_SetNCSbState(WND* wndPtr, int vMin, int vMax, int vPos,
1196                                        int hMin, int hMax, int hPos)
1197 {
1198   SCROLLBAR_INFO  *infoPtr = SCROLL_GetPtrScrollInfo(wndPtr, SB_VERT);
1199
1200   wndPtr->dwStyle |= (WS_VSCROLL | WS_HSCROLL);
1201
1202   if( vMin >= vMax )
1203     { vMin = vMax;
1204       wndPtr->dwStyle &= ~WS_VSCROLL; }
1205   if( vPos > vMax ) vPos = vMax; else if( vPos < vMin ) vPos = vMin;
1206   infoPtr->MinVal = vMin;
1207   infoPtr->MaxVal = vMax;
1208   infoPtr->CurVal = vPos;
1209
1210   infoPtr = SCROLL_GetPtrScrollInfo(wndPtr, SB_HORZ);
1211
1212   if( hMin >= hMax )
1213     { hMin = hMax;
1214       wndPtr->dwStyle &= ~WS_HSCROLL; }
1215   if( hPos > hMax ) hPos = hMax; else if( hPos < hMin ) hPos = hMin;
1216   infoPtr->MinVal = hMin;
1217   infoPtr->MaxVal = hMax;
1218   infoPtr->CurVal = hPos;
1219
1220   return wndPtr->dwStyle & (WS_VSCROLL | WS_HSCROLL);
1221 }
1222
1223
1224 /*************************************************************************
1225  *           GetScrollRange16   (USER.65)
1226  */
1227 BOOL16 WINAPI GetScrollRange16( HWND16 hwnd, INT16 nBar,
1228                                 LPINT16 lpMin, LPINT16 lpMax)
1229 {
1230     INT32 min, max;
1231     BOOL16 ret = GetScrollRange32( hwnd, nBar, &min, &max );
1232     if (lpMin) *lpMin = min;
1233     if (lpMax) *lpMax = max;
1234     return ret;
1235 }
1236
1237
1238 /*************************************************************************
1239  *           GetScrollRange32   (USER32.286)
1240  *
1241  * RETURNS STD
1242  */
1243 BOOL32 WINAPI GetScrollRange32(
1244 HWND32 hwnd, /* [I] Handle of window */
1245 INT32 nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL  */
1246 LPINT32 lpMin, /* [O] Where to store minimum value */
1247 LPINT32 lpMax /* [O] Where to store maximum value */)
1248 {
1249     SCROLLBAR_INFO *infoPtr;
1250
1251     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar )))
1252     {
1253         if (lpMin) lpMin = 0;
1254         if (lpMax) lpMax = 0;
1255         return FALSE;
1256     }
1257     if (lpMin) *lpMin = infoPtr->MinVal;
1258     if (lpMax) *lpMax = infoPtr->MaxVal;
1259     return TRUE;
1260 }
1261
1262
1263 /*************************************************************************
1264  *           ShowScrollBar16   (USER.267)
1265  */
1266 void WINAPI ShowScrollBar16( HWND16 hwnd, INT16 nBar, BOOL16 fShow )
1267 {
1268     ShowScrollBar32( hwnd, nBar, fShow );
1269 }
1270
1271
1272 /*************************************************************************
1273  *           ShowScrollBar32   (USER32.532)
1274  *
1275  * RETURNS STD
1276  */
1277 BOOL32 WINAPI ShowScrollBar32(
1278 HWND32 hwnd, /* [I] Handle of window whose scrollbar(s) will be affected   */
1279 INT32 nBar, /* [I] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1280 BOOL32 fShow /* [I] TRUE = show, FALSE = hide  */)
1281 {
1282     WND *wndPtr = WIN_FindWndPtr( hwnd );
1283
1284     if (!wndPtr) return FALSE;
1285     TRACE(scroll, "hwnd=%04x bar=%d on=%d\n",
1286                     hwnd, nBar, fShow );
1287
1288     switch(nBar)
1289     {
1290     case SB_CTL:
1291         ShowWindow32( hwnd, fShow ? SW_SHOW : SW_HIDE );
1292         return TRUE;
1293
1294     case SB_HORZ:
1295         if (fShow)
1296         {
1297             if (wndPtr->dwStyle & WS_HSCROLL) return TRUE;
1298             wndPtr->dwStyle |= WS_HSCROLL;
1299         }
1300         else  /* hide it */
1301         {
1302             if (!(wndPtr->dwStyle & WS_HSCROLL)) return TRUE;
1303             wndPtr->dwStyle &= ~WS_HSCROLL;
1304         }
1305         break;
1306
1307     case SB_VERT:
1308         if (fShow)
1309         {
1310             if (wndPtr->dwStyle & WS_VSCROLL) return TRUE;
1311             wndPtr->dwStyle |= WS_VSCROLL;
1312         }
1313         else  /* hide it */
1314         {
1315             if (!(wndPtr->dwStyle & WS_VSCROLL)) return TRUE;
1316             wndPtr->dwStyle &= ~WS_VSCROLL;
1317         }
1318         break;
1319
1320     case SB_BOTH:
1321         if (fShow)
1322         {
1323             if ((wndPtr->dwStyle & WS_HSCROLL)
1324                 && (wndPtr->dwStyle & WS_VSCROLL)) return TRUE;
1325             wndPtr->dwStyle |= WS_HSCROLL | WS_VSCROLL;
1326         }
1327         else  /* hide it */
1328         {
1329             if (!(wndPtr->dwStyle & WS_HSCROLL)
1330                 && !(wndPtr->dwStyle & WS_VSCROLL)) return TRUE;
1331             wndPtr->dwStyle &= ~(WS_HSCROLL | WS_VSCROLL);
1332         }
1333         break;
1334
1335     default:
1336         return TRUE;  /* Nothing to do! */
1337     }
1338     SetWindowPos32( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1339                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1340     return TRUE;
1341 }
1342
1343
1344 /*************************************************************************
1345  *           EnableScrollBar16   (USER.482)
1346  */
1347 BOOL16 WINAPI EnableScrollBar16( HWND16 hwnd, INT16 nBar, UINT16 flags )
1348 {
1349     return EnableScrollBar32( hwnd, nBar, flags );
1350 }
1351
1352
1353 /*************************************************************************
1354  *           EnableScrollBar32   (USER32.171)
1355  */
1356 BOOL32 WINAPI EnableScrollBar32( HWND32 hwnd, INT32 nBar, UINT32 flags )
1357 {
1358     SCROLLBAR_INFO *infoPtr;
1359
1360     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1361     TRACE(scroll, "%04x %d %d\n",
1362                     hwnd, nBar, flags );
1363     flags &= ESB_DISABLE_BOTH;
1364     if (infoPtr->flags == flags) return FALSE;
1365     infoPtr->flags = flags;
1366
1367     /* Redraw the whole scroll bar */
1368     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE );
1369     return TRUE;
1370 }