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 "windef.h"
   9 #include "wingdi.h"
  10 #include "wine/winuser16.h"
  11 #include "scroll.h"
  12 #include "heap.h"
  13 #include "win.h"
  14 #include "debugtools.h"
  15 #include "cache.h"
  16 #include "tweak.h"
  17
  18 DEFAULT_DEBUG_CHANNEL(scroll)
  19
  20
  21 static HBITMAP hUpArrow = 0;
  22 static HBITMAP hDnArrow = 0;
  23 static HBITMAP hLfArrow = 0;
  24 static HBITMAP hRgArrow = 0;
  25 static HBITMAP hUpArrowD = 0;
  26 static HBITMAP hDnArrowD = 0;
  27 static HBITMAP hLfArrowD = 0;
  28 static HBITMAP hRgArrowD = 0;
  29 static HBITMAP hUpArrowI = 0;
  30 static HBITMAP hDnArrowI = 0;
  31 static HBITMAP hLfArrowI = 0;
  32 static HBITMAP hRgArrowI = 0;
  33
  34 #define TOP_ARROW(flags,pressed) \
  35    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  36 #define BOTTOM_ARROW(flags,pressed) \
  37    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  38 #define LEFT_ARROW(flags,pressed) \
  39    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  40 #define RIGHT_ARROW(flags,pressed) \
  41    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  42
  43
  44   /* Minimum size of the rectangle between the arrows */
  45 #define SCROLL_MIN_RECT  4
  46
  47   /* Minimum size of the thumb in pixels */
  48 #define SCROLL_MIN_THUMB 6
  49
  50   /* Overlap between arrows and thumb */
  51 #define SCROLL_ARROW_THUMB_OVERLAP ((TWEAK_WineLook == WIN31_LOOK) ? 1 : 0)
  52
  53   /* Delay (in ms) before first repetition when holding the button down */
  54 #define SCROLL_FIRST_DELAY   200
  55
  56   /* Delay (in ms) between scroll repetitions */
  57 #define SCROLL_REPEAT_DELAY  50
  58
  59   /* Scroll timer id */
  60 #define SCROLL_TIMER   0
  61
  62   /* Scroll-bar hit testing */
  63 enum SCROLL_HITTEST
  64 {
  65     SCROLL_NOWHERE,      /* Outside the scroll bar */
  66     SCROLL_TOP_ARROW,    /* Top or left arrow */
  67     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  68     SCROLL_THUMB,        /* Thumb rectangle */
  69     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  70     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  71 };
  72
  73  /* What to do after SCROLL_SetScrollInfo() */
  74 #define SA_SSI_HIDE             0x0001
  75 #define SA_SSI_SHOW             0x0002
  76 #define SA_SSI_REFRESH          0x0004
  77 #define SA_SSI_REPAINT_ARROWS   0x0008
  78
  79  /* Thumb-tracking info */
  80 static HWND SCROLL_TrackingWin = 0;
  81 static INT  SCROLL_TrackingBar = 0;
  82 static INT  SCROLL_TrackingPos = 0;
  83 static INT  SCROLL_TrackingVal = 0;
  84  /* Hit test code of the last button-down event */
  85 static enum SCROLL_HITTEST SCROLL_trackHitTest;
  86 static BOOL SCROLL_trackVertical;
  87
  88  /* Is the moving thumb being displayed? */
  89 static BOOL SCROLL_MovingThumb = FALSE;
  90
  91  /* Local functions */
  92 static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
  93                                     BOOL fShowH, BOOL fShowV );
  94 static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
  95                                    const SCROLLINFO *info, INT *action );
  96 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
  97                                     RECT *rect, INT arrowSize,
  98                                     INT thumbSize, INT thumbPos,
  99                                     UINT flags, BOOL vertical,
 100                                     BOOL top_selected, BOOL bottom_selected );
 101
 102
 103 /***********************************************************************
 104  *           SCROLL_LoadBitmaps
 105  */
 106 static void SCROLL_LoadBitmaps(void)
 107 {
 108     hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
 109     hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
 110     hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
 111     hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
 112     hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
 113     hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
 114     hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
 115     hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
 116     hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
 117     hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
 118     hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
 119     hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
 120 }
 121
 122
 123 /***********************************************************************
 124  *           SCROLL_GetPtrScrollInfo
 125  */
 126 static SCROLLBAR_INFO *SCROLL_GetPtrScrollInfo( WND* wndPtr, INT nBar )
 127 {
 128     SCROLLBAR_INFO *infoPtr;
 129
 130     if (!wndPtr) return NULL;
 131     switch(nBar)
 132     {
 133         case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
 134         case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
 135         case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
 136         default:      return NULL;
 137     }
 138
 139     if (!infoPtr)  /* Create the info structure if needed */
 140     {
 141         if ((infoPtr = HeapAlloc( SystemHeap, 0, sizeof(SCROLLBAR_INFO) )))
 142         {
 143             infoPtr->MinVal = infoPtr->CurVal = infoPtr->Page = 0;
 144             infoPtr->MaxVal = 100;
 145             infoPtr->flags  = ESB_ENABLE_BOTH;
 146             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 147             else wndPtr->pVScroll = infoPtr;
 148         }
 149         if (!hUpArrow) SCROLL_LoadBitmaps();
 150     }
 151     return infoPtr;
 152 }
 153
 154
 155 /***********************************************************************
 156  *           SCROLL_GetScrollInfo
 157  */
 158 static SCROLLBAR_INFO *SCROLL_GetScrollInfo( HWND hwnd, INT nBar )
 159 {
 160    SCROLLBAR_INFO *retvalue;
 161    WND *wndPtr = WIN_FindWndPtr( hwnd );
 162    retvalue = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 163    WIN_ReleaseWndPtr(wndPtr);
 164    return retvalue;
 165 }
 166
 167
 168 /***********************************************************************
 169  *           SCROLL_GetScrollBarRect
 170  *
 171  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 172  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 173  * 'arrowSize' returns the width or height of an arrow (depending on
 174  * the orientation of the scrollbar), 'thumbSize' returns the size of
 175  * the thumb, and 'thumbPos' returns the position of the thumb
 176  * relative to the left or to the top.
 177  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 178  */
 179 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
 180                                        INT *arrowSize, INT *thumbSize,
 181                                        INT *thumbPos )
 182 {
 183     INT pixels;
 184     BOOL vertical;
 185     WND *wndPtr = WIN_FindWndPtr( hwnd );
 186
 187     switch(nBar)
 188     {
 189       case SB_HORZ:
 190         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 191         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 192         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 193         lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
 194         if(wndPtr->dwStyle & WS_BORDER) {
 195           lprect->left--;
 196           lprect->right++;
 197         } else if(wndPtr->dwStyle & WS_VSCROLL)
 198           lprect->right++;
 199         vertical = FALSE;
 200         break;
 201
 202       case SB_VERT:
 203         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 204         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 205         lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
 206         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 207         if(wndPtr->dwStyle & WS_BORDER) {
 208           lprect->top--;
 209           lprect->bottom++;
 210         } else if(wndPtr->dwStyle & WS_HSCROLL)
 211           lprect->bottom++;
 212         vertical = TRUE;
 213         break;
 214
 215       case SB_CTL:
 216         GetClientRect( hwnd, lprect );
 217         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 218         break;
 219
 220     default:
 221         WIN_ReleaseWndPtr(wndPtr);
 222         return FALSE;
 223     }
 224
 225     if (vertical) pixels = lprect->bottom - lprect->top;
 226     else pixels = lprect->right - lprect->left;
 227
 228     if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
 229     {
 230         if (pixels > SCROLL_MIN_RECT)
 231             *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 232         else
 233             *arrowSize = 0;
 234         *thumbPos = *thumbSize = 0;
 235     }
 236     else
 237     {
 238         SCROLLBAR_INFO *info = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 239
 240         *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
 241         pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
 242
 243         if (info->Page)
 244         {
 245             *thumbSize = pixels * info->Page / (info->MaxVal-info->MinVal+1);
 246             if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
 247         }
 248         else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 249
 250         if (((pixels -= *thumbSize ) < 0) ||
 251             ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
 252         {
 253             /* Rectangle too small or scrollbar disabled -> no thumb */
 254             *thumbPos = *thumbSize = 0;
 255         }
 256         else
 257         {
 258             INT max = info->MaxVal - max( info->Page-1, 0 );
 259             if (info->MinVal >= max)
 260                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 261             else
 262                 *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
 263                  + pixels * (info->CurVal-info->MinVal) / (max - info->MinVal);
 264         }
 265     }
 266     WIN_ReleaseWndPtr(wndPtr);
 267     return vertical;
 268 }
 269
 270
 271 /***********************************************************************
 272  *           SCROLL_GetThumbVal
 273  *
 274  * Compute the current scroll position based on the thumb position in pixels
 275  * from the top of the scroll-bar.
 276  */
 277 static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
 278                                   BOOL vertical, INT pos )
 279 {
 280     INT thumbSize;
 281     INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 282
 283     if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
 284         return infoPtr->MinVal;
 285
 286     if (infoPtr->Page)
 287     {
 288         thumbSize = pixels * infoPtr->Page/(infoPtr->MaxVal-infoPtr->MinVal+1);
 289         if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
 290     }
 291     else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
 292
 293     if ((pixels -= thumbSize) <= 0) return infoPtr->MinVal;
 294
 295     pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
 296     if (pos > pixels) pos = pixels;
 297
 298     if (!infoPtr->Page) pos *= infoPtr->MaxVal - infoPtr->MinVal;
 299     else pos *= infoPtr->MaxVal - infoPtr->MinVal - infoPtr->Page + 1;
 300     return infoPtr->MinVal + ((pos + pixels / 2) / pixels);
 301 }
 302
 303 /***********************************************************************
 304  *           SCROLL_PtInRectEx
 305  */
 306 static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
 307 {
 308     RECT rect = *lpRect;
 309
 310     if (vertical)
 311     {
 312         rect.left -= lpRect->right - lpRect->left;
 313         rect.right += lpRect->right - lpRect->left;
 314     }
 315     else
 316     {
 317         rect.top -= lpRect->bottom - lpRect->top;
 318         rect.bottom += lpRect->bottom - lpRect->top;
 319     }
 320     return PtInRect( &rect, pt );
 321 }
 322
 323 /***********************************************************************
 324  *           SCROLL_ClipPos
 325  */
 326 static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
 327 {
 328     if( pt.x < lpRect->left )
 329         pt.x = lpRect->left;
 330     else
 331     if( pt.x > lpRect->right )
 332         pt.x = lpRect->right;
 333
 334     if( pt.y < lpRect->top )
 335         pt.y = lpRect->top;
 336     else
 337     if( pt.y > lpRect->bottom )
 338         pt.y = lpRect->bottom;
 339
 340     return pt;
 341 }
 342
 343
 344 /***********************************************************************
 345  *           SCROLL_HitTest
 346  *
 347  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 348  */
 349 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
 350                                            POINT pt, BOOL bDragging )
 351 {
 352     INT arrowSize, thumbSize, thumbPos;
 353     RECT rect;
 354
 355     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 356                                            &arrowSize, &thumbSize, &thumbPos );
 357
 358     if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
 359          (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
 360
 361     if (vertical)
 362     {
 363         if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
 364         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 365         if (!thumbPos) return SCROLL_TOP_RECT;
 366         pt.y -= rect.top;
 367         if (pt.y < thumbPos) return SCROLL_TOP_RECT;
 368         if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 369     }
 370     else  /* horizontal */
 371     {
 372         if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
 373         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 374         if (!thumbPos) return SCROLL_TOP_RECT;
 375         pt.x -= rect.left;
 376         if (pt.x < thumbPos) return SCROLL_TOP_RECT;
 377         if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
 378     }
 379     return SCROLL_THUMB;
 380 }
 381
 382
 383 /***********************************************************************
 384  *           SCROLL_DrawArrows
 385  *
 386  * Draw the scroll bar arrows.
 387  */
 388 static void SCROLL_DrawArrows_9x( HDC hdc, SCROLLBAR_INFO *infoPtr,
 389                                   RECT *rect, INT arrowSize, BOOL vertical,
 390                                   BOOL top_pressed, BOOL bottom_pressed )
 391 {
 392   RECT r;
 393
 394   r = *rect;
 395   if( vertical )
 396     r.bottom = r.top + arrowSize;
 397   else
 398     r.right = r.left + arrowSize;
 399
 400   DrawFrameControl( hdc, &r, DFC_SCROLL,
 401                     (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
 402                     | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 403                     | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );
 404
 405   r = *rect;
 406   if( vertical )
 407     r.top = r.bottom-arrowSize;
 408   else
 409     r.left = r.right-arrowSize;
 410
 411   DrawFrameControl( hdc, &r, DFC_SCROLL,
 412                     (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
 413                     | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
 414                     | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
 415 }
 416
 417 static void SCROLL_DrawArrows_31( HDC hdc, SCROLLBAR_INFO *infoPtr,
 418                                   RECT *rect, INT arrowSize, BOOL vertical,
 419                                   BOOL top_pressed, BOOL bottom_pressed )
 420 {
 421     HDC hdcMem = CreateCompatibleDC( hdc );
 422     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 423                                     TOP_ARROW(infoPtr->flags, top_pressed)
 424                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 425
 426     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 427     StretchBlt( hdc, rect->left, rect->top,
 428                   vertical ? rect->right-rect->left : arrowSize,
 429                   vertical ? arrowSize : rect->bottom-rect->top,
 430                   hdcMem, 0, 0,
 431                   GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 432                   SRCCOPY );
 433
 434     SelectObject( hdcMem, vertical ?
 435                     BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 436                     : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 437     if (vertical)
 438         StretchBlt( hdc, rect->left, rect->bottom - arrowSize,
 439                       rect->right - rect->left, arrowSize,
 440                       hdcMem, 0, 0,
 441                       GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
 442                       SRCCOPY );
 443     else
 444         StretchBlt( hdc, rect->right - arrowSize, rect->top,
 445                       arrowSize, rect->bottom - rect->top,
 446                       hdcMem, 0, 0,
 447                       GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
 448                       SRCCOPY );
 449     SelectObject( hdcMem, hbmpPrev );
 450     DeleteDC( hdcMem );
 451 }
 452
 453 static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
 454                                RECT *rect, INT arrowSize, BOOL vertical,
 455                                BOOL top_pressed, BOOL bottom_pressed )
 456 {
 457   if( TWEAK_WineLook == WIN31_LOOK )
 458     SCROLL_DrawArrows_31( hdc, infoPtr, rect, arrowSize,
 459                           vertical, top_pressed,bottom_pressed );
 460   else
 461     SCROLL_DrawArrows_9x( hdc, infoPtr, rect, arrowSize,
 462                           vertical, top_pressed,bottom_pressed );
 463 }
 464
 465
 466 /***********************************************************************
 467  *           SCROLL_DrawMovingThumb
 468  *
 469  * Draw the moving thumb rectangle.
 470  */
 471 static void SCROLL_DrawMovingThumb_31( HDC hdc, RECT *rect, BOOL vertical,
 472                                        INT arrowSize, INT thumbSize )
 473 {
 474     RECT r = *rect;
 475     if (vertical)
 476     {
 477         r.top += SCROLL_TrackingPos;
 478         if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 479             r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 480         if (r.top + thumbSize >
 481                        rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 482             r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 483                                                                   - thumbSize;
 484         r.bottom = r.top + thumbSize;
 485     }
 486     else
 487     {
 488         r.left += SCROLL_TrackingPos;
 489         if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 490             r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 491         if (r.left + thumbSize >
 492                        rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
 493             r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
 494                                                                   - thumbSize;
 495         r.right = r.left + thumbSize;
 496     }
 497
 498     DrawFocusRect( hdc, &r );
 499     SCROLL_MovingThumb = !SCROLL_MovingThumb;
 500 }
 501
 502 static void SCROLL_DrawMovingThumb_9x( HDC hdc, RECT *rect, BOOL vertical,
 503                                        INT arrowSize, INT thumbSize )
 504 {
 505   INT pos = SCROLL_TrackingPos;
 506   INT max_size;
 507
 508   if( vertical )
 509     max_size = rect->bottom - rect->top;
 510   else
 511     max_size = rect->right - rect->left;
 512
 513   max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;
 514
 515   if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
 516     pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
 517   else if( pos > max_size )
 518     pos = max_size;
 519
 520   SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
 521                           rect, arrowSize, thumbSize, pos,
 522                           0, vertical, FALSE, FALSE );
 523
 524   SCROLL_MovingThumb = !SCROLL_MovingThumb;
 525 }
 526
 527 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 528                                     INT arrowSize, INT thumbSize )
 529 {
 530   if( TWEAK_WineLook == WIN31_LOOK )
 531     SCROLL_DrawMovingThumb_31( hdc, rect, vertical, arrowSize, thumbSize );
 532   else
 533     SCROLL_DrawMovingThumb_9x( hdc, rect, vertical, arrowSize, thumbSize );
 534 }
 535
 536 /***********************************************************************
 537  *           SCROLL_DrawInterior
 538  *
 539  * Draw the scroll bar interior (everything except the arrows).
 540  */
 541 static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
 542                                     RECT *rect, INT arrowSize,
 543                                     INT thumbSize, INT thumbPos,
 544                                     UINT flags, BOOL vertical,
 545                                     BOOL top_selected, BOOL bottom_selected )
 546 {
 547     RECT r;
 548     HPEN hSavePen;
 549     HBRUSH hSaveBrush,hBrush;
 550
 551     /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 552      * The window-owned scrollbars need to call DEFWND_ControlColor
 553      * to correctly setup default scrollbar colors
 554      */
 555     if (nBar == SB_CTL)
 556     {
 557       hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 558                                      (WPARAM)hdc,(LPARAM)hwnd);
 559     }
 560     else
 561     {
 562       hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 563     }
 564
 565     hSavePen = SelectObject( hdc, GetSysColorPen(COLOR_WINDOWFRAME) );
 566     hSaveBrush = SelectObject( hdc, hBrush );
 567
 568     /* Calculate the scroll rectangle */
 569     r = *rect;
 570     if (vertical)
 571     {
 572         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 573         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 574     }
 575     else
 576     {
 577         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 578         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 579     }
 580
 581     /* Draw the scroll rectangles and thumb */
 582     if (!thumbPos)  /* No thumb to draw */
 583     {
 584         PatBlt( hdc, r.left, r.top,
 585                      r.right - r.left, r.bottom - r.top,
 586                      PATCOPY );
 587
 588         /* cleanup and return */
 589         SelectObject( hdc, hSavePen );
 590         SelectObject( hdc, hSaveBrush );
 591         return;
 592     }
 593
 594     if (vertical)
 595     {
 596         PatBlt( hdc, r.left, r.top,
 597                   r.right - r.left,
 598                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 599                   top_selected ? 0x0f0000 : PATCOPY );
 600         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 601         PatBlt( hdc, r.left, r.top + thumbSize,
 602                   r.right - r.left,
 603                   r.bottom - r.top - thumbSize,
 604                   bottom_selected ? 0x0f0000 : PATCOPY );
 605         r.bottom = r.top + thumbSize;
 606     }
 607     else  /* horizontal */
 608     {
 609         PatBlt( hdc, r.left, r.top,
 610                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 611                   r.bottom - r.top,
 612                   top_selected ? 0x0f0000 : PATCOPY );
 613         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 614         PatBlt( hdc, r.left + thumbSize, r.top,
 615                   r.right - r.left - thumbSize,
 616                   r.bottom - r.top,
 617                   bottom_selected ? 0x0f0000 : PATCOPY );
 618         r.right = r.left + thumbSize;
 619     }
 620
 621     /* Draw the thumb */
 622     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );
 623
 624     /* cleanup */
 625     SelectObject( hdc, hSavePen );
 626     SelectObject( hdc, hSaveBrush );
 627 }
 628
 629
 630 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
 631                                  RECT *rect, INT arrowSize,
 632                                  INT thumbSize, INT thumbPos,
 633                                  UINT flags, BOOL vertical,
 634                                  BOOL top_selected, BOOL bottom_selected )
 635 {
 636     RECT r;
 637     HPEN hSavePen;
 638     HBRUSH hSaveBrush,hBrush;
 639     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 640
 641     if (Save_SCROLL_MovingThumb &&
 642         (SCROLL_TrackingWin == hwnd) &&
 643         (SCROLL_TrackingBar == nBar))
 644         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 645
 646       /* Select the correct brush and pen */
 647
 648     if (TWEAK_WineLook == WIN31_LOOK && (flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 649     {
 650         /* This ought to be the color of the parent window */
 651         if (TWEAK_WineLook == WIN31_LOOK) {
 652             hBrush = GetSysColorBrush(COLOR_WINDOW);
 653         } else {
 654             /* Under Win9x look & feel, scrollbars don't have a solid border.
 655              * To make scrollbar's background different from the window
 656              * background, we need to apply a gray 0x55aa pattern brush.
 657              * Otherwise it won't look good.
 658              */
 659             hBrush = CACHE_GetPattern55AABrush();
 660        }
 661     }
 662     else
 663     {
 664         /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
 665          * The window-owned scrollbars need to call DEFWND_ControlColor
 666          * to correctly setup default scrollbar colors
 667          */
 668         if (nBar == SB_CTL) {
 669             hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
 670                                            (WPARAM)hdc,(LPARAM)hwnd);
 671         } else {
 672             hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
 673         }
 674     }
 675     hSavePen = SelectObject( hdc, GetSysColorPen(COLOR_WINDOWFRAME) );
 676     hSaveBrush = SelectObject( hdc, hBrush );
 677
 678       /* Calculate the scroll rectangle */
 679
 680     r = *rect;
 681     if (vertical)
 682     {
 683         r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 684         r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 685     }
 686     else
 687     {
 688         r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
 689         r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 690     }
 691
 692       /* Draw the scroll bar frame */
 693
 694         /* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
 695     if (TWEAK_WineLook == WIN31_LOOK)
 696         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 697
 698       /* Draw the scroll rectangles and thumb */
 699
 700     if (!thumbPos)  /* No thumb to draw */
 701     {
 702         INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 0 : 1;
 703
 704         PatBlt( hdc, r.left+offset, r.top+offset,
 705                      r.right - r.left - 2*offset, r.bottom - r.top - 2*offset,
 706                      PATCOPY );
 707
 708         /* cleanup and return */
 709         SelectObject( hdc, hSavePen );
 710         SelectObject( hdc, hSaveBrush );
 711         return;
 712     }
 713
 714     if (vertical)
 715     {
 716         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 717
 718         PatBlt( hdc, r.left + offset, r.top + offset,
 719                   r.right - r.left - offset*2,
 720                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - offset,
 721                   top_selected ? 0x0f0000 : PATCOPY );
 722         r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 723         PatBlt( hdc, r.left + offset, r.top + thumbSize,
 724                   r.right - r.left - offset*2,
 725                   r.bottom - r.top - thumbSize - offset,
 726                   bottom_selected ? 0x0f0000 : PATCOPY );
 727         r.bottom = r.top + thumbSize;
 728     }
 729     else  /* horizontal */
 730     {
 731         INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;
 732
 733         PatBlt( hdc, r.left + offset, r.top + offset,
 734                   thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
 735                   r.bottom - r.top - offset*2,
 736                   top_selected ? 0x0f0000 : PATCOPY );
 737         r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
 738         PatBlt( hdc, r.left + thumbSize, r.top + offset,
 739                   r.right - r.left - thumbSize - offset,
 740                   r.bottom - r.top - offset*2,
 741                   bottom_selected ? 0x0f0000 : PATCOPY );
 742         r.right = r.left + thumbSize;
 743     }
 744
 745       /* Draw the thumb */
 746
 747     SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
 748     if (TWEAK_WineLook == WIN31_LOOK)
 749     {
 750         Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 751         r.top++, r.left++;
 752     }
 753     else
 754     {
 755         Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
 756     }
 757     DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
 758
 759     if (Save_SCROLL_MovingThumb &&
 760         (SCROLL_TrackingWin == hwnd) &&
 761         (SCROLL_TrackingBar == nBar))
 762         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
 763
 764     /* cleanup */
 765     SelectObject( hdc, hSavePen );
 766     SelectObject( hdc, hSaveBrush );
 767 }
 768
 769
 770 /***********************************************************************
 771  *           SCROLL_DrawScrollBar
 772  *
 773  * Redraw the whole scrollbar.
 774  */
 775 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
 776                            BOOL arrows, BOOL interior )
 777 {
 778     INT arrowSize, thumbSize, thumbPos;
 779     RECT rect;
 780     BOOL vertical;
 781     WND *wndPtr = WIN_FindWndPtr( hwnd );
 782     SCROLLBAR_INFO *infoPtr = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 783     BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
 784
 785     if (!wndPtr || !infoPtr ||
 786         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 787         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
 788     if (!WIN_IsWindowDrawable( wndPtr, FALSE )) goto END;
 789
 790     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 791                                         &arrowSize, &thumbSize, &thumbPos );
 792
 793     if (Save_SCROLL_MovingThumb &&
 794         (SCROLL_TrackingWin == hwnd) &&
 795         (SCROLL_TrackingBar == nBar))
 796         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 797
 798       /* Draw the arrows */
 799
 800     if (arrows && arrowSize)
 801     {
 802         if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
 803             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 804                                (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
 805                                (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
 806         else
 807             SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 808                                                                FALSE, FALSE );
 809     }
 810     if( interior )
 811         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 812                          thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
 813
 814     if (Save_SCROLL_MovingThumb &&
 815         (SCROLL_TrackingWin == hwnd) &&
 816         (SCROLL_TrackingBar == nBar))
 817         SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
 818
 819 END:
 820     WIN_ReleaseWndPtr(wndPtr);
 821 }
 822
 823
 824 /***********************************************************************
 825  *           SCROLL_RefreshScrollBar
 826  *
 827  * Repaint the scroll bar interior after a SetScrollRange() or
 828  * SetScrollPos() call.
 829  */
 830 static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
 831                                      BOOL arrows, BOOL interior )
 832 {
 833     HDC hdc = GetDCEx( hwnd, 0,
 834                            DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
 835     if (!hdc) return;
 836
 837     SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
 838     ReleaseDC( hwnd, hdc );
 839 }
 840
 841
 842 /***********************************************************************
 843  *           SCROLL_HandleKbdEvent
 844  *
 845  * Handle a keyboard event (only for SB_CTL scrollbars).
 846  */
 847 static void SCROLL_HandleKbdEvent( HWND hwnd, WPARAM wParam )
 848 {
 849     WND *wndPtr = WIN_FindWndPtr( hwnd );
 850     WPARAM msg;
 851
 852     switch(wParam)
 853     {
 854     case VK_PRIOR: msg = SB_PAGEUP; break;
 855     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 856     case VK_HOME:  msg = SB_TOP; break;
 857     case VK_END:   msg = SB_BOTTOM; break;
 858     case VK_UP:    msg = SB_LINEUP; break;
 859     case VK_DOWN:  msg = SB_LINEDOWN; break;
 860     default:
 861         WIN_ReleaseWndPtr(wndPtr);
 862         return;
 863     }
 864     SendMessageA( GetParent(hwnd),
 865                     (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 866                     msg, hwnd );
 867     WIN_ReleaseWndPtr(wndPtr);
 868 }
 869
 870
 871 /***********************************************************************
 872  *           SCROLL_HandleScrollEvent
 873  *
 874  * Handle a mouse or timer event for the scrollbar.
 875  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 876  * windows coordinates.
 877  */
 878 void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
 879 {
 880       /* Previous mouse position for timer events */
 881     static POINT prevPt;
 882       /* Thumb position when tracking started. */
 883     static UINT trackThumbPos;
 884       /* Position in the scroll-bar of the last button-down event. */
 885     static INT lastClickPos;
 886       /* Position in the scroll-bar of the last mouse event. */
 887     static INT lastMousePos;
 888
 889     enum SCROLL_HITTEST hittest;
 890     HWND hwndOwner, hwndCtl;
 891     BOOL vertical;
 892     INT arrowSize, thumbSize, thumbPos;
 893     RECT rect;
 894     HDC hdc;
 895
 896     SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 897     if (!infoPtr) return;
 898     if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
 899                   return;
 900
 901     hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
 902     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 903                                         &arrowSize, &thumbSize, &thumbPos );
 904     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 905     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 906
 907     switch(msg)
 908     {
 909       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 910           SCROLL_trackVertical = vertical;
 911           SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 912           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 913           lastMousePos  = lastClickPos;
 914           trackThumbPos = thumbPos;
 915           prevPt = pt;
 916           SetCapture( hwnd );
 917           if (nBar == SB_CTL) SetFocus( hwnd );
 918           break;
 919
 920       case WM_MOUSEMOVE:
 921           hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
 922           prevPt = pt;
 923           break;
 924
 925       case WM_LBUTTONUP:
 926           hittest = SCROLL_NOWHERE;
 927           ReleaseCapture();
 928           break;
 929
 930       case WM_SYSTIMER:
 931           pt = prevPt;
 932           hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
 933           break;
 934
 935       default:
 936           return;  /* Should never happen */
 937     }
 938
 939     TRACE("Event: hwnd=%04x bar=%d msg=%x pt=%ld,%ld hit=%d\n",
 940                  hwnd, nBar, msg, pt.x, pt.y, hittest );
 941
 942     switch(SCROLL_trackHitTest)
 943     {
 944     case SCROLL_NOWHERE:  /* No tracking in progress */
 945         break;
 946
 947     case SCROLL_TOP_ARROW:
 948         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 949                            (hittest == SCROLL_trackHitTest), FALSE );
 950         if (hittest == SCROLL_trackHitTest)
 951         {
 952             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 953             {
 954                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 955                                 SB_LINEUP, hwndCtl );
 956             }
 957
 958             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 959                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 960                             (TIMERPROC)0 );
 961         }
 962         else KillSystemTimer( hwnd, SCROLL_TIMER );
 963         break;
 964
 965     case SCROLL_TOP_RECT:
 966         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 967                              thumbPos, infoPtr->flags, vertical,
 968                              (hittest == SCROLL_trackHitTest), FALSE );
 969         if (hittest == SCROLL_trackHitTest)
 970         {
 971             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 972             {
 973                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 974                                 SB_PAGEUP, hwndCtl );
 975                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 976                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 977                                   (TIMERPROC)0 );
 978             }
 979         }
 980         else KillSystemTimer( hwnd, SCROLL_TIMER );
 981         break;
 982
 983     case SCROLL_THUMB:
 984         if (msg == WM_LBUTTONDOWN)
 985         {
 986             SCROLL_TrackingWin = hwnd;
 987             SCROLL_TrackingBar = nBar;
 988             SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
 989             if (!SCROLL_MovingThumb)
 990                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 991         }
 992         else if (msg == WM_LBUTTONUP)
 993         {
 994             if (SCROLL_MovingThumb)
 995                 SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
 996             SCROLL_TrackingWin = 0;
 997             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
 998                                  thumbPos, infoPtr->flags, vertical,
 999                                  FALSE, FALSE );
1000         }
1001         else  /* WM_MOUSEMOVE */
1002         {
1003             UINT pos;
1004
1005             if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
1006             else
1007             {
1008                 pt = SCROLL_ClipPos( &rect, pt );
1009                 pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
1010             }
1011             if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
1012             {
1013                 if (SCROLL_MovingThumb)
1014                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1015                                         arrowSize, thumbSize );
1016                 lastMousePos = pos;
1017                 SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
1018                 SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
1019                                                          vertical,
1020                                                          SCROLL_TrackingPos );
1021                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1022                                 MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
1023                                 hwndCtl );
1024                 if (!SCROLL_MovingThumb)
1025                     SCROLL_DrawMovingThumb( hdc, &rect, vertical,
1026                                         arrowSize, thumbSize );
1027             }
1028         }
1029         break;
1030
1031     case SCROLL_BOTTOM_RECT:
1032         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
1033                              thumbPos, infoPtr->flags, vertical,
1034                              FALSE, (hittest == SCROLL_trackHitTest) );
1035         if (hittest == SCROLL_trackHitTest)
1036         {
1037             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1038             {
1039                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1040                                 SB_PAGEDOWN, hwndCtl );
1041                 SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1042                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1043                                   (TIMERPROC)0 );
1044             }
1045         }
1046         else KillSystemTimer( hwnd, SCROLL_TIMER );
1047         break;
1048
1049     case SCROLL_BOTTOM_ARROW:
1050         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
1051                            FALSE, (hittest == SCROLL_trackHitTest) );
1052         if (hittest == SCROLL_trackHitTest)
1053         {
1054             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
1055             {
1056                 SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1057                                 SB_LINEDOWN, hwndCtl );
1058             }
1059
1060             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
1061                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
1062                             (TIMERPROC)0 );
1063         }
1064         else KillSystemTimer( hwnd, SCROLL_TIMER );
1065         break;
1066     }
1067
1068     if (msg == WM_LBUTTONUP)
1069     {
1070         hittest = SCROLL_trackHitTest;
1071         SCROLL_trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
1072
1073         if (hittest == SCROLL_THUMB)
1074         {
1075             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
1076                                  trackThumbPos + lastMousePos - lastClickPos );
1077             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1078                             MAKEWPARAM( SB_THUMBPOSITION, val ), hwndCtl );
1079         }
1080         else
1081             SendMessageA( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
1082                             SB_ENDSCROLL, hwndCtl );
1083     }
1084
1085     ReleaseDC( hwnd, hdc );
1086 }
1087
1088
1089 /***********************************************************************
1090  *           ScrollBarWndProc
1091  */
1092 LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT message, WPARAM wParam,
1093                                  LPARAM lParam )
1094 {
1095     switch(message)
1096     {
1097     case WM_CREATE:
1098         {
1099             CREATESTRUCTA *lpCreat = (CREATESTRUCTA *)lParam;
1100             if (lpCreat->style & SBS_SIZEBOX)
1101             {
1102                 FIXME("Unimplemented style SBS_SIZEBOX.\n" );
1103                 return 0;
1104             }
1105
1106             if (lpCreat->style & SBS_VERT)
1107             {
1108                 if (lpCreat->style & SBS_LEFTALIGN)
1109                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
1110                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
1111                 else if (lpCreat->style & SBS_RIGHTALIGN)
1112                     MoveWindow( hwnd,
1113                                   lpCreat->x+lpCreat->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
1114                                   lpCreat->y,
1115                                   GetSystemMetrics(SM_CXVSCROLL)+1, lpCreat->cy, FALSE );
1116             }
1117             else  /* SBS_HORZ */
1118             {
1119                 if (lpCreat->style & SBS_TOPALIGN)
1120                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
1121                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1122                 else if (lpCreat->style & SBS_BOTTOMALIGN)
1123                     MoveWindow( hwnd,
1124                                   lpCreat->x,
1125                                   lpCreat->y+lpCreat->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
1126                                   lpCreat->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
1127             }
1128         }
1129         if (!hUpArrow) SCROLL_LoadBitmaps();
1130         TRACE("ScrollBar creation, hwnd=%04x\n", hwnd );
1131         return 0;
1132
1133     case WM_LBUTTONDOWN:
1134     case WM_LBUTTONUP:
1135     case WM_MOUSEMOVE:
1136     case WM_SYSTIMER:
1137         {
1138             POINT pt;
1139             CONV_POINT16TO32( (POINT16 *)&lParam, &pt );
1140             SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
1141         }
1142         break;
1143
1144     case WM_KEYDOWN:
1145         SCROLL_HandleKbdEvent( hwnd, wParam );
1146         break;
1147
1148     case WM_ERASEBKGND:
1149          return 1;
1150
1151     case WM_GETDLGCODE:
1152          return DLGC_WANTARROWS; /* Windows returns this value */
1153
1154     case WM_PAINT:
1155         {
1156             PAINTSTRUCT ps;
1157             HDC hdc = BeginPaint( hwnd, &ps );
1158             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
1159             EndPaint( hwnd, &ps );
1160         }
1161         break;
1162
1163     case SBM_SETPOS16:
1164     case SBM_SETPOS:
1165         return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
1166
1167     case SBM_GETPOS16:
1168     case SBM_GETPOS:
1169         return GetScrollPos( hwnd, SB_CTL );
1170
1171     case SBM_SETRANGE16:
1172         SetScrollRange( hwnd, SB_CTL, LOWORD(lParam), HIWORD(lParam),
1173                           wParam  /* FIXME: Is this correct? */ );
1174         return 0;
1175
1176     case SBM_SETRANGE:
1177         SetScrollRange( hwnd, SB_CTL, wParam, lParam, FALSE );
1178         return 0;  /* FIXME: return previous position */
1179
1180     case SBM_GETRANGE16:
1181         FIXME("don't know how to handle SBM_GETRANGE16 (wp=%04x,lp=%08lx)\n", wParam, lParam );
1182         return 0;
1183
1184     case SBM_GETRANGE:
1185         GetScrollRange( hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam );
1186         return 0;
1187
1188     case SBM_ENABLE_ARROWS16:
1189     case SBM_ENABLE_ARROWS:
1190         return EnableScrollBar( hwnd, SB_CTL, wParam );
1191
1192     case SBM_SETRANGEREDRAW:
1193         SetScrollRange( hwnd, SB_CTL, wParam, lParam, TRUE );
1194         return 0;  /* FIXME: return previous position */
1195
1196     case SBM_SETSCROLLINFO:
1197         return SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
1198
1199     case SBM_GETSCROLLINFO:
1200         return GetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam );
1201
1202     case 0x00e5:
1203     case 0x00e7:
1204     case 0x00e8:
1205     case 0x00eb:
1206     case 0x00ec:
1207     case 0x00ed:
1208     case 0x00ee:
1209     case 0x00ef:
1210         ERR("unknown Win32 msg %04x wp=%08x lp=%08lx\n",
1211                     message, wParam, lParam );
1212         break;
1213
1214     default:
1215         if (message >= WM_USER)
1216             WARN("unknown msg %04x wp=%04x lp=%08lx\n",
1217                          message, wParam, lParam );
1218         return DefWindowProcA( hwnd, message, wParam, lParam );
1219     }
1220     return 0;
1221 }
1222
1223
1224 /*************************************************************************
1225  *           SetScrollInfo16   (USER.475)
1226  */
1227 INT16 WINAPI SetScrollInfo16( HWND16 hwnd, INT16 nBar, const SCROLLINFO *info,
1228                               BOOL16 bRedraw )
1229 {
1230     return (INT16)SetScrollInfo( hwnd, nBar, info, bRedraw );
1231 }
1232
1233
1234 /*************************************************************************
1235  *           SetScrollInfo   (USER32.501)
1236  * SetScrollInfo can be used to set the position, upper bound,
1237  * lower bound, and page size of a scrollbar control.
1238  *
1239  * RETURNS
1240  *    Scrollbar position
1241  *
1242  * NOTE
1243  *    For 100 lines of text to be displayed in a window of 25 lines,
1244  *  one would for instance use info->nMin=0, info->nMax=75
1245  *  (corresponding to the 76 different positions of the window on
1246  *  the text), and info->nPage=25.
1247  */
1248 INT WINAPI SetScrollInfo(
1249 HWND hwnd /* [I] Handle of window whose scrollbar will be affected */,
1250 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1251 const SCROLLINFO *info /* [I] Specifies what to change and new values */,
1252 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
1253 {
1254     INT action;
1255     INT retVal = SCROLL_SetScrollInfo( hwnd, nBar, info, &action );
1256
1257     if( action & SA_SSI_HIDE )
1258         SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
1259     else
1260     {
1261         if( action & SA_SSI_SHOW )
1262             if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
1263                 return retVal; /* SetWindowPos() already did the painting */
1264
1265         if( bRedraw && (action & SA_SSI_REFRESH))
1266             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1267         else if( action & SA_SSI_REPAINT_ARROWS )
1268             SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
1269     }
1270     return retVal;
1271 }
1272
1273 INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
1274                             const SCROLLINFO *info, INT *action  )
1275 {
1276     /* Update the scrollbar state and set action flags according to
1277      * what has to be done graphics wise. */
1278
1279     SCROLLBAR_INFO *infoPtr;
1280     UINT new_flags;
1281
1282    *action = 0;
1283
1284     if (!(infoPtr = SCROLL_GetScrollInfo(hwnd, nBar))) return 0;
1285     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return 0;
1286     if ((info->cbSize != sizeof(*info)) &&
1287         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return 0;
1288
1289     if (TRACE_ON(scroll))
1290     {
1291         DPRINTF( "hwnd=%04x bar=%d", hwnd, nBar);
1292         if (info->fMask & SIF_PAGE) DPRINTF( " page=%d", info->nPage );
1293         if (info->fMask & SIF_POS) DPRINTF( " pos=%d", info->nPos );
1294         if (info->fMask & SIF_RANGE) DPRINTF( " min=%d max=%d", info->nMin, info->nMax );
1295         DPRINTF("\n");
1296     }
1297
1298     /* Set the page size */
1299
1300     if (info->fMask & SIF_PAGE)
1301     {
1302         if( infoPtr->Page != info->nPage )
1303         {
1304             infoPtr->Page = info->nPage;
1305            *action |= SA_SSI_REFRESH;
1306         }
1307     }
1308
1309     /* Set the scroll pos */
1310
1311     if (info->fMask & SIF_POS)
1312     {
1313         if( infoPtr->CurVal != info->nPos )
1314         {
1315             infoPtr->CurVal = info->nPos;
1316            *action |= SA_SSI_REFRESH;
1317         }
1318     }
1319
1320     /* Set the scroll range */
1321
1322     if (info->fMask & SIF_RANGE)
1323     {
1324         /* Invalid range -> range is set to (0,0) */
1325         if ((info->nMin > info->nMax) ||
1326             ((UINT)(info->nMax - info->nMin) >= 0x80000000))
1327         {
1328             infoPtr->MinVal = 0;
1329             infoPtr->MaxVal = 0;
1330         }
1331         else
1332         {
1333             if( infoPtr->MinVal != info->nMin ||
1334                 infoPtr->MaxVal != info->nMax )
1335             {
1336                *action |= SA_SSI_REFRESH;
1337                 infoPtr->MinVal = info->nMin;
1338                 infoPtr->MaxVal = info->nMax;
1339             }
1340         }
1341     }
1342
1343     /* Make sure the page size is valid */
1344
1345     if (infoPtr->Page < 0) infoPtr->Page = 0;
1346     else if (infoPtr->Page > infoPtr->MaxVal - infoPtr->MinVal + 1 )
1347         infoPtr->Page = infoPtr->MaxVal - infoPtr->MinVal + 1;
1348
1349     /* Make sure the pos is inside the range */
1350
1351     if (infoPtr->CurVal < infoPtr->MinVal)
1352         infoPtr->CurVal = infoPtr->MinVal;
1353     else if (infoPtr->CurVal > infoPtr->MaxVal - max( infoPtr->Page-1, 0 ))
1354         infoPtr->CurVal = infoPtr->MaxVal - max( infoPtr->Page-1, 0 );
1355
1356     TRACE("    new values: page=%d pos=%d min=%d max=%d\n",
1357                  infoPtr->Page, infoPtr->CurVal,
1358                  infoPtr->MinVal, infoPtr->MaxVal );
1359
1360     /* don't change the scrollbar state if SetScrollInfo
1361      * is just called with SIF_DISABLENOSCROLL
1362      */
1363     if(!(info->fMask & SIF_ALL)) goto done;
1364
1365     /* Check if the scrollbar should be hidden or disabled */
1366
1367     if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
1368     {
1369         new_flags = infoPtr->flags;
1370         if (infoPtr->MinVal >= infoPtr->MaxVal - max( infoPtr->Page-1, 0 ))
1371         {
1372             /* Hide or disable scroll-bar */
1373             if (info->fMask & SIF_DISABLENOSCROLL)
1374             {
1375                 new_flags = ESB_DISABLE_BOTH;
1376                *action |= SA_SSI_REFRESH;
1377             }
1378             else if (nBar != SB_CTL)
1379             {
1380                 *action = SA_SSI_HIDE;
1381                 goto done;
1382             }
1383         }
1384         else  /* Show and enable scroll-bar */
1385         {
1386             new_flags = 0;
1387             if (nBar != SB_CTL)
1388                 *action |= SA_SSI_SHOW;
1389         }
1390
1391         if (infoPtr->flags != new_flags) /* check arrow flags */
1392         {
1393             infoPtr->flags = new_flags;
1394            *action |= SA_SSI_REPAINT_ARROWS;
1395         }
1396     }
1397
1398 done:
1399     /* Return current position */
1400
1401     return infoPtr->CurVal;
1402 }
1403
1404
1405 /*************************************************************************
1406  *           GetScrollInfo16   (USER.476)
1407  */
1408 BOOL16 WINAPI GetScrollInfo16( HWND16 hwnd, INT16 nBar, LPSCROLLINFO info )
1409 {
1410     return GetScrollInfo( hwnd, nBar, info );
1411 }
1412
1413
1414 /*************************************************************************
1415  *           GetScrollInfo   (USER32.284)
1416  * GetScrollInfo can be used to retrieve the position, upper bound,
1417  * lower bound, and page size of a scrollbar control.
1418  *
1419  * RETURNS STD
1420  */
1421 BOOL WINAPI GetScrollInfo(
1422   HWND hwnd /* [I] Handle of window */ ,
1423   INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1424   LPSCROLLINFO info /* [IO] (info.fMask [I] specifies which values are to retrieve) */)
1425 {
1426     SCROLLBAR_INFO *infoPtr;
1427
1428     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1429     if (info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)) return FALSE;
1430     if ((info->cbSize != sizeof(*info)) &&
1431         (info->cbSize != sizeof(*info)-sizeof(info->nTrackPos))) return FALSE;
1432
1433     if (info->fMask & SIF_PAGE) info->nPage = infoPtr->Page;
1434     if (info->fMask & SIF_POS) info->nPos = infoPtr->CurVal;
1435     if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
1436         info->nTrackPos = (SCROLL_TrackingWin==hwnd) ? SCROLL_TrackingVal : infoPtr->CurVal;
1437     if (info->fMask & SIF_RANGE)
1438     {
1439         info->nMin = infoPtr->MinVal;
1440         info->nMax = infoPtr->MaxVal;
1441     }
1442     return (info->fMask & SIF_ALL) != 0;
1443 }
1444
1445
1446 /*************************************************************************
1447  *           SetScrollPos16   (USER.62)
1448  */
1449 INT16 WINAPI SetScrollPos16( HWND16 hwnd, INT16 nBar, INT16 nPos,
1450                              BOOL16 bRedraw )
1451 {
1452     return (INT16)SetScrollPos( hwnd, nBar, nPos, bRedraw );
1453 }
1454
1455
1456 /*************************************************************************
1457  *           SetScrollPos   (USER32.502)
1458  *
1459  * RETURNS
1460  *    Success: Scrollbar position
1461  *    Failure: 0
1462  *
1463  * REMARKS
1464  *    Note the ambiguity when 0 is returned.  Use GetLastError
1465  *    to make sure there was an error (and to know which one).
1466  */
1467 INT WINAPI SetScrollPos(
1468 HWND hwnd /* [I] Handle of window whose scrollbar will be affected */,
1469 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */,
1470 INT nPos /* [I] New value */,
1471 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */ )
1472 {
1473     SCROLLINFO info;
1474     SCROLLBAR_INFO *infoPtr;
1475     INT oldPos;
1476
1477     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1478     oldPos      = infoPtr->CurVal;
1479     info.cbSize = sizeof(info);
1480     info.nPos   = nPos;
1481     info.fMask  = SIF_POS;
1482     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1483     return oldPos;
1484 }
1485
1486
1487 /*************************************************************************
1488  *           GetScrollPos16   (USER.63)
1489  */
1490 INT16 WINAPI GetScrollPos16( HWND16 hwnd, INT16 nBar )
1491 {
1492     return (INT16)GetScrollPos( hwnd, nBar );
1493 }
1494
1495
1496 /*************************************************************************
1497  *           GetScrollPos   (USER32.285)
1498  *
1499  * RETURNS
1500  *    Success: Current position
1501  *    Failure: 0
1502  *
1503  * REMARKS
1504  *    Note the ambiguity when 0 is returned.  Use GetLastError
1505  *    to make sure there was an error (and to know which one).
1506  */
1507 INT WINAPI GetScrollPos(
1508 HWND hwnd, /* [I] Handle of window */
1509 INT nBar /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */)
1510 {
1511     SCROLLBAR_INFO *infoPtr;
1512
1513     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
1514     return infoPtr->CurVal;
1515 }
1516
1517
1518 /*************************************************************************
1519  *           SetScrollRange16   (USER.64)
1520  */
1521 void WINAPI SetScrollRange16( HWND16 hwnd, INT16 nBar,
1522                               INT16 MinVal, INT16 MaxVal, BOOL16 bRedraw )
1523 {
1524     /* Invalid range -> range is set to (0,0) */
1525     if ((INT)MaxVal - (INT)MinVal > 0x7fff) MinVal = MaxVal = 0;
1526     SetScrollRange( hwnd, nBar, MinVal, MaxVal, bRedraw );
1527 }
1528
1529
1530 /*************************************************************************
1531  *           SetScrollRange   (USER32.503)
1532  *
1533  * RETURNS STD
1534  */
1535 BOOL WINAPI SetScrollRange(
1536 HWND hwnd, /* [I] Handle of window whose scrollbar will be affected */
1537 INT nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL */
1538 INT MinVal, /* [I] New minimum value */
1539 INT MaxVal, /* [I] New maximum value */
1540 BOOL bRedraw /* [I] Should scrollbar be redrawn afterwards ? */)
1541 {
1542     SCROLLINFO info;
1543
1544     info.cbSize = sizeof(info);
1545     info.nMin   = MinVal;
1546     info.nMax   = MaxVal;
1547     info.fMask  = SIF_RANGE;
1548     SetScrollInfo( hwnd, nBar, &info, bRedraw );
1549     return TRUE;
1550 }
1551
1552
1553 /*************************************************************************
1554  *           SCROLL_SetNCSbState
1555  *
1556  * Updates both scrollbars at the same time. Used by MDI CalcChildScroll().
1557  */
1558 INT SCROLL_SetNCSbState(WND* wndPtr, int vMin, int vMax, int vPos,
1559                                        int hMin, int hMax, int hPos)
1560 {
1561     INT vA, hA;
1562     SCROLLINFO vInfo, hInfo;
1563
1564     vInfo.cbSize = hInfo.cbSize = sizeof(SCROLLINFO);
1565     vInfo.nMin   = vMin;         hInfo.nMin   = hMin;
1566     vInfo.nMax   = vMax;         hInfo.nMax   = hMax;
1567     vInfo.nPos   = vPos;         hInfo.nPos   = hPos;
1568     vInfo.fMask  = hInfo.fMask = SIF_RANGE | SIF_POS;
1569
1570     SCROLL_SetScrollInfo( wndPtr->hwndSelf, SB_VERT, &vInfo, &vA );
1571     SCROLL_SetScrollInfo( wndPtr->hwndSelf, SB_HORZ, &hInfo, &hA );
1572
1573     if( !SCROLL_ShowScrollBar( wndPtr->hwndSelf, SB_BOTH,
1574                               (hA & SA_SSI_SHOW),(vA & SA_SSI_SHOW) ) )
1575     {
1576         /* SetWindowPos() wasn't called, just redraw the scrollbars if needed */
1577         if( vA & SA_SSI_REFRESH )
1578             SCROLL_RefreshScrollBar( wndPtr->hwndSelf, SB_VERT, FALSE, TRUE );
1579
1580         if( hA & SA_SSI_REFRESH )
1581             SCROLL_RefreshScrollBar( wndPtr->hwndSelf, SB_HORZ, FALSE, TRUE );
1582     }
1583     return 0;
1584 }
1585
1586
1587 /*************************************************************************
1588  *           GetScrollRange16   (USER.65)
1589  */
1590 BOOL16 WINAPI GetScrollRange16( HWND16 hwnd, INT16 nBar,
1591                                 LPINT16 lpMin, LPINT16 lpMax)
1592 {
1593     INT min, max;
1594     BOOL16 ret = GetScrollRange( hwnd, nBar, &min, &max );
1595     if (lpMin) *lpMin = min;
1596     if (lpMax) *lpMax = max;
1597     return ret;
1598 }
1599
1600
1601 /*************************************************************************
1602  *           GetScrollRange   (USER32.286)
1603  *
1604  * RETURNS STD
1605  */
1606 BOOL WINAPI GetScrollRange(
1607 HWND hwnd, /* [I] Handle of window */
1608 INT nBar, /* [I] One of SB_HORZ, SB_VERT, or SB_CTL  */
1609 LPINT lpMin, /* [O] Where to store minimum value */
1610 LPINT lpMax /* [O] Where to store maximum value */)
1611 {
1612     SCROLLBAR_INFO *infoPtr;
1613
1614     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar )))
1615     {
1616         if (lpMin) lpMin = 0;
1617         if (lpMax) lpMax = 0;
1618         return FALSE;
1619     }
1620     if (lpMin) *lpMin = infoPtr->MinVal;
1621     if (lpMax) *lpMax = infoPtr->MaxVal;
1622     return TRUE;
1623 }
1624
1625
1626 /*************************************************************************
1627  *           SCROLL_ShowScrollBar()
1628  *
1629  * Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
1630  */
1631 BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
1632                              BOOL fShowH, BOOL fShowV )
1633 {
1634     WND *wndPtr = WIN_FindWndPtr( hwnd );
1635     BOOL retvalue = FALSE;
1636
1637     if (!wndPtr) return FALSE;
1638     TRACE("hwnd=%04x bar=%d horz=%d, vert=%d\n",
1639                     hwnd, nBar, fShowH, fShowV );
1640
1641     switch(nBar)
1642     {
1643     case SB_CTL:
1644         ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
1645         retvalue = TRUE;
1646         goto END;
1647
1648     case SB_BOTH:
1649     case SB_HORZ:
1650         if (fShowH)
1651         {
1652             fShowH = !(wndPtr->dwStyle & WS_HSCROLL);
1653             wndPtr->dwStyle |= WS_HSCROLL;
1654         }
1655         else  /* hide it */
1656         {
1657             fShowH = (wndPtr->dwStyle & WS_HSCROLL);
1658             wndPtr->dwStyle &= ~WS_HSCROLL;
1659         }
1660         if( nBar == SB_HORZ ) {
1661             fShowV = FALSE;
1662             break;
1663         }
1664         /* fall through */
1665
1666     case SB_VERT:
1667         if (fShowV)
1668         {
1669             fShowV = !(wndPtr->dwStyle & WS_VSCROLL);
1670             wndPtr->dwStyle |= WS_VSCROLL;
1671         }
1672         else  /* hide it */
1673         {
1674             fShowV = (wndPtr->dwStyle & WS_VSCROLL);
1675             wndPtr->dwStyle &= ~WS_VSCROLL;
1676         }
1677         if ( nBar == SB_VERT )
1678            fShowH = FALSE;
1679         break;
1680
1681     default:
1682         retvalue = FALSE;  /* Nothing to do! */
1683         goto END;
1684     }
1685
1686     if( fShowH || fShowV ) /* frame has been changed, let the window redraw itself */
1687     {
1688         SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
1689                     | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
1690         retvalue = TRUE;
1691         goto END;
1692     }
1693
1694     retvalue = FALSE; /* no frame changes */
1695 END:
1696     WIN_ReleaseWndPtr(wndPtr);
1697     return retvalue;
1698 }
1699
1700
1701 /*************************************************************************
1702  *           ShowScrollBar16   (USER.267)
1703  */
1704 void WINAPI ShowScrollBar16( HWND16 hwnd, INT16 nBar, BOOL16 fShow )
1705 {
1706     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1707                                       (nBar == SB_HORZ) ? 0 : fShow );
1708 }
1709
1710
1711 /*************************************************************************
1712  *           ShowScrollBar   (USER32.532)
1713  *
1714  * RETURNS STD
1715  */
1716 BOOL WINAPI ShowScrollBar(
1717 HWND hwnd, /* [I] Handle of window whose scrollbar(s) will be affected   */
1718 INT nBar, /* [I] One of SB_HORZ, SB_VERT, SB_BOTH or SB_CTL */
1719 BOOL fShow /* [I] TRUE = show, FALSE = hide  */)
1720 {
1721     SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
1722                                       (nBar == SB_HORZ) ? 0 : fShow );
1723     return TRUE;
1724 }
1725
1726
1727 /*************************************************************************
1728  *           EnableScrollBar16   (USER.482)
1729  */
1730 BOOL16 WINAPI EnableScrollBar16( HWND16 hwnd, INT16 nBar, UINT16 flags )
1731 {
1732     return EnableScrollBar( hwnd, nBar, flags );
1733 }
1734
1735
1736 /*************************************************************************
1737  *           EnableScrollBar   (USER32.171)
1738  */
1739 BOOL WINAPI EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
1740 {
1741     BOOL bFineWithMe;
1742     SCROLLBAR_INFO *infoPtr;
1743
1744     TRACE("%04x %d %d\n", hwnd, nBar, flags );
1745
1746     flags &= ESB_DISABLE_BOTH;
1747
1748     if (nBar == SB_BOTH)
1749     {
1750         if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, SB_VERT ))) return FALSE;
1751         if (!(bFineWithMe = (infoPtr->flags == flags)) )
1752         {
1753             infoPtr->flags = flags;
1754             SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
1755         }
1756         nBar = SB_HORZ;
1757     }
1758     else
1759         bFineWithMe = TRUE;
1760
1761     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
1762     if (bFineWithMe && infoPtr->flags == flags) return FALSE;
1763     infoPtr->flags = flags;
1764
1765     SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
1766     return TRUE;
1767 }