controls/scroll.c

   1 /*
   2  * Interface code to SCROLLBAR widget
   3  *
   4  * Copyright  Martin Ayotte, 1993
   5  * Copyright  Alexandre Julliard, 1994
   6  *
   7  * Small fixes and implemented SB_THUMBPOSITION
   8  * by Peter Broadhurst, 940611
   9  */
  10
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #include "windows.h"
  16 #include "syscolor.h"
  17 #include "sysmetrics.h"
  18 #include "scroll.h"
  19 #include "user.h"
  20 #include "graphics.h"
  21 #include "win.h"
  22 #include "stddebug.h"
  23 /* #define DEBUG_SCROLL */
  24 #include "debug.h"
  25
  26
  27 static HBITMAP hUpArrow = 0;
  28 static HBITMAP hDnArrow = 0;
  29 static HBITMAP hLfArrow = 0;
  30 static HBITMAP hRgArrow = 0;
  31 static HBITMAP hUpArrowD = 0;
  32 static HBITMAP hDnArrowD = 0;
  33 static HBITMAP hLfArrowD = 0;
  34 static HBITMAP hRgArrowD = 0;
  35 static HBITMAP hUpArrowI = 0;
  36 static HBITMAP hDnArrowI = 0;
  37 static HBITMAP hLfArrowI = 0;
  38 static HBITMAP hRgArrowI = 0;
  39
  40 #define TOP_ARROW(flags,pressed) \
  41    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  42 #define BOTTOM_ARROW(flags,pressed) \
  43    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  44 #define LEFT_ARROW(flags,pressed) \
  45    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  46 #define RIGHT_ARROW(flags,pressed) \
  47    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  48
  49
  50   /* Minimum size of the rectangle between the arrows */
  51 #define SCROLL_MIN_RECT  4
  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  100
  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
  74 /***********************************************************************
  75  *           SCROLL_LoadBitmaps
  76  */
  77 static void SCROLL_LoadBitmaps(void)
  78 {
  79     hUpArrow  = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROW));
  80     hDnArrow  = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROW));
  81     hLfArrow  = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROW));
  82     hRgArrow  = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROW));
  83     hUpArrowD = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROWD));
  84     hDnArrowD = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROWD));
  85     hLfArrowD = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROWD));
  86     hRgArrowD = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROWD));
  87     hUpArrowI = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROWI));
  88     hDnArrowI = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROWI));
  89     hLfArrowI = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROWI));
  90     hRgArrowI = LoadBitmap((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROWI));
  91 }
  92
  93
  94 /***********************************************************************
  95  *           SCROLL_GetScrollInfo
  96  */
  97 static SCROLLINFO *SCROLL_GetScrollInfo( HWND hwnd, int nBar )
  98 {
  99     HANDLE handle;
 100     WND *wndPtr = WIN_FindWndPtr( hwnd );
 101
 102     if (!wndPtr) return NULL;
 103     switch(nBar)
 104     {
 105         case SB_HORZ: handle = wndPtr->hHScroll; break;
 106         case SB_VERT: handle = wndPtr->hVScroll; break;
 107         case SB_CTL:  return (SCROLLINFO *)wndPtr->wExtra;
 108         default:      return NULL;
 109     }
 110
 111     if (!handle)  /* Create the info structure if needed */
 112     {
 113         if ((handle = USER_HEAP_ALLOC( sizeof(SCROLLINFO) )))
 114         {
 115             SCROLLINFO *infoPtr = (SCROLLINFO *) USER_HEAP_LIN_ADDR( handle );
 116             infoPtr->MinVal = infoPtr->CurVal = 0;
 117             infoPtr->MaxVal = 100;
 118             infoPtr->flags  = ESB_ENABLE_BOTH;
 119             if (nBar == SB_HORZ) wndPtr->hHScroll = handle;
 120             else wndPtr->hVScroll = handle;
 121         }
 122         if (!hUpArrow) SCROLL_LoadBitmaps();
 123     }
 124     return (SCROLLINFO *) USER_HEAP_LIN_ADDR( handle );
 125 }
 126
 127
 128 /***********************************************************************
 129  *           SCROLL_GetScrollBarRect
 130  *
 131  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 132  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 133  * 'arrowSize' returns the width or height of an arrow (depending on the
 134  * orientation of the scrollbar), and 'thumbPos' returns the position of
 135  * the thumb relative to the left or to the top.
 136  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 137  */
 138 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, int nBar, RECT *lprect,
 139                                      WORD *arrowSize, WORD *thumbPos )
 140 {
 141     int pixels;
 142     BOOL vertical;
 143     WND *wndPtr = WIN_FindWndPtr( hwnd );
 144
 145     switch(nBar)
 146     {
 147       case SB_HORZ:
 148         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - 1;
 149         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 150         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left +1;
 151         lprect->bottom = lprect->top + SYSMETRICS_CYHSCROLL + 1;
 152         vertical = FALSE;
 153         break;
 154
 155       case SB_VERT:
 156         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 157         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top - 1;
 158         lprect->right  = lprect->left + SYSMETRICS_CXVSCROLL + 1;
 159         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top +1;
 160         vertical = TRUE;
 161         break;
 162
 163       case SB_CTL:
 164         GetClientRect( hwnd, lprect );
 165         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 166         break;
 167
 168     default:
 169         return FALSE;
 170     }
 171
 172     if (vertical) pixels = lprect->bottom - lprect->top;
 173     else pixels = lprect->right - lprect->left;
 174
 175     if (pixels > 2*SYSMETRICS_CXVSCROLL + SCROLL_MIN_RECT)
 176     {
 177         *arrowSize = SYSMETRICS_CXVSCROLL;
 178     }
 179     else if (pixels > SCROLL_MIN_RECT)
 180     {
 181         *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 182     }
 183     else *arrowSize = 0;
 184
 185     if ((pixels -= 3*SYSMETRICS_CXVSCROLL+1) > 0)
 186     {
 187         SCROLLINFO *info = SCROLL_GetScrollInfo( hwnd, nBar );
 188         if ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 189             *thumbPos = 0;
 190         else if (info->MinVal == info->MaxVal)
 191             *thumbPos = *arrowSize;
 192         else
 193             *thumbPos = *arrowSize + pixels * (info->CurVal - info->MinVal) /
 194                                               (info->MaxVal - info->MinVal);
 195     }
 196     else *thumbPos = 0;
 197     return vertical;
 198 }
 199
 200
 201 /***********************************************************************
 202  *           SCROLL_GetThumbVal
 203  *
 204  * Compute the current scroll position based on the thumb position in pixels
 205  * from the top of the scroll-bar.
 206  */
 207 static UINT SCROLL_GetThumbVal( SCROLLINFO *infoPtr, RECT *rect,
 208                                 BOOL vertical, WORD pos )
 209 {
 210     int pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 211     if ((pixels -= 3*SYSMETRICS_CXVSCROLL+1) <= 0) return infoPtr->MinVal;
 212     pos = max( 0, pos - SYSMETRICS_CXVSCROLL );
 213     if (pos > pixels) pos = pixels;
 214     dprintf_scroll(stddeb,"GetThumbVal: pos=%d ret=%d\n", pos,
 215                    (infoPtr->MinVal
 216             + (UINT)(((int)pos * (infoPtr->MaxVal-infoPtr->MinVal) + pixels/2)
 217                      / pixels)) );
 218     return (infoPtr->MinVal
 219             + (UINT)(((int)pos * (infoPtr->MaxVal-infoPtr->MinVal) + pixels/2)
 220                      / pixels));
 221 }
 222
 223
 224 /***********************************************************************
 225  *           SCROLL_HitTest
 226  *
 227  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 228  */
 229 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, int nBar, POINT pt )
 230 {
 231     WORD arrowSize, thumbPos;
 232     RECT rect;
 233
 234     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 235                                              &arrowSize, &thumbPos );
 236     if (!PtInRect( &rect, pt )) return SCROLL_NOWHERE;
 237
 238     if (vertical)
 239     {
 240         if (pt.y <= rect.top + arrowSize + 1) return SCROLL_TOP_ARROW;
 241         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 242         if (!thumbPos) return SCROLL_TOP_RECT;
 243         pt.y -= rect.top;
 244         if (pt.y < (INT)thumbPos) return SCROLL_TOP_RECT;
 245         if (pt.y > thumbPos+SYSMETRICS_CYHSCROLL) return SCROLL_BOTTOM_RECT;
 246         return SCROLL_THUMB;
 247     }
 248     else  /* horizontal */
 249     {
 250         if (pt.x <= rect.left + arrowSize) return SCROLL_TOP_ARROW;
 251         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 252         if (!thumbPos) return SCROLL_TOP_RECT;
 253         pt.x -= rect.left;
 254         if (pt.x < (INT)thumbPos) return SCROLL_TOP_RECT;
 255         if (pt.x > thumbPos+SYSMETRICS_CXVSCROLL) return SCROLL_BOTTOM_RECT;
 256         return SCROLL_THUMB;
 257     }
 258 }
 259
 260
 261 /***********************************************************************
 262  *           SCROLL_DrawArrows
 263  *
 264  * Draw the scroll bar arrows.
 265  */
 266 static void SCROLL_DrawArrows( HDC hdc, SCROLLINFO *infoPtr, RECT *rect,
 267                                WORD arrowSize, BOOL vertical,
 268                                BOOL top_pressed, BOOL bottom_pressed )
 269 {
 270     HDC hdcMem = CreateCompatibleDC( hdc );
 271     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 272                                     TOP_ARROW(infoPtr->flags, top_pressed)
 273                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 274     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 275     StretchBlt( hdc, rect->left, rect->top,
 276                 vertical ? rect->right-rect->left : arrowSize+1,
 277                 vertical ? arrowSize+1 : rect->bottom-rect->top,
 278                 hdcMem, 0, 0,
 279                 SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 280                 SRCCOPY );
 281
 282     SelectObject( hdcMem, vertical ?
 283                   BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 284                   : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 285     if (vertical)
 286         StretchBlt( hdc, rect->left, rect->bottom - arrowSize - 1,
 287                    rect->right - rect->left, arrowSize + 1,
 288                    hdcMem, 0, 0,
 289                    SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 290                    SRCCOPY );
 291     else
 292         StretchBlt( hdc, rect->right - arrowSize - 1, rect->top,
 293                    arrowSize + 1, rect->bottom - rect->top,
 294                    hdcMem, 0, 0,
 295                    SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 296                    SRCCOPY );
 297     SelectObject( hdcMem, hbmpPrev );
 298     DeleteDC( hdcMem );
 299 }
 300
 301
 302 /***********************************************************************
 303  *           SCROLL_DrawMovingThumb
 304  *
 305  * Draw the moving thumb rectangle.
 306  */
 307 static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
 308                                     WORD arrowSize, WORD thumbPos )
 309 {
 310     RECT r = *rect;
 311     if (vertical)
 312     {
 313         r.top += thumbPos;
 314         if (r.top < rect->top + arrowSize) r.top = rect->top + arrowSize;
 315         if (r.top + SYSMETRICS_CYHSCROLL >= rect->bottom - arrowSize)
 316             r.top = rect->bottom - arrowSize - SYSMETRICS_CYHSCROLL - 1;
 317         r.bottom = r.top + SYSMETRICS_CYHSCROLL + 1;
 318     }
 319     else
 320     {
 321         r.left += thumbPos;
 322         if (r.left < rect->left + arrowSize) r.left = rect->left + arrowSize;
 323         if (r.left + SYSMETRICS_CXVSCROLL >= rect->right - arrowSize)
 324             r.left = rect->right - arrowSize - SYSMETRICS_CXVSCROLL - 1;
 325         r.right = r.left + SYSMETRICS_CXVSCROLL + 1;
 326     }
 327     InflateRect( &r, -1, -1 );
 328     DrawFocusRect( hdc, &r );
 329 }
 330
 331
 332 /***********************************************************************
 333  *           SCROLL_DrawInterior
 334  *
 335  * Draw the scroll bar interior (everything except the arrows).
 336  */
 337 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, int nBar, RECT *rect,
 338                                  WORD arrowSize, WORD thumbPos, WORD flags,
 339                                  BOOL vertical, BOOL top_selected,
 340                                  BOOL bottom_selected )
 341 {
 342     RECT r;
 343     WND *wndPtr = WIN_FindWndPtr( hwnd );
 344     if (((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL))
 345         || ((nBar == SB_HORZ) && (!wndPtr->dwStyle & WS_HSCROLL))) return;
 346
 347       /* Select the correct brush and pen */
 348
 349     SelectObject( hdc, sysColorObjects.hpenWindowFrame );
 350     if ((flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 351     {
 352           /* This ought to be the color of the parent window */
 353         SelectObject( hdc, sysColorObjects.hbrushWindow );
 354     }
 355     else
 356     {
 357         if (nBar == SB_CTL)  /* Only scrollbar controls send WM_CTLCOLOR */
 358         {
 359             HBRUSH hbrush = SendMessage( GetParent(hwnd), WM_CTLCOLOR, hdc,
 360                                          MAKELONG(hwnd, CTLCOLOR_SCROLLBAR) );
 361             SelectObject( hdc, hbrush );
 362         }
 363         else SelectObject( hdc, sysColorObjects.hbrushScrollbar );
 364     }
 365
 366       /* Calculate the scroll rectangle */
 367
 368     r = *rect;
 369     if (vertical)
 370     {
 371         r.top    += arrowSize;
 372         r.bottom -= arrowSize;
 373     }
 374     else
 375     {
 376         r.left  += arrowSize;
 377         r.right -= arrowSize;
 378     }
 379
 380       /* Draw the scroll bar frame */
 381
 382     MoveTo( hdc, r.left, r.top );
 383     LineTo( hdc, r.right-1, r.top );
 384     LineTo( hdc, r.right-1, r.bottom-1 );
 385     LineTo( hdc, r.left, r.bottom-1 );
 386     LineTo( hdc, r.left, r.top );
 387
 388       /* Draw the scroll rectangles and thumb */
 389
 390     if (!thumbPos)  /* No thumb to draw */
 391     {
 392         PatBlt( hdc, r.left+1, r.top+1, r.right - r.left - 2,
 393                 r.bottom - r.top - 2, PATCOPY );
 394         return;
 395     }
 396
 397     if (vertical)
 398     {
 399         PatBlt( hdc, r.left + 1, r.top + 1,
 400                 r.right - r.left - 2,
 401                 thumbPos - arrowSize,
 402                 top_selected ? 0x0f0000 : PATCOPY );
 403         r.top += thumbPos - arrowSize;
 404         PatBlt( hdc, r.left + 1, r.top + SYSMETRICS_CYHSCROLL + 1,
 405                 r.right - r.left - 2,
 406                 r.bottom - r.top - SYSMETRICS_CYHSCROLL - 2,
 407                 bottom_selected ? 0x0f0000 : PATCOPY );
 408         r.bottom = r.top + SYSMETRICS_CYHSCROLL + 1;
 409     }
 410     else  /* horizontal */
 411     {
 412         PatBlt( hdc, r.left + 1, r.top + 1,
 413                 thumbPos - arrowSize,
 414                 r.bottom - r.top - 2,
 415                 top_selected ? 0x0f0000 : PATCOPY );
 416         r.left += thumbPos - arrowSize;
 417         PatBlt( hdc, r.left + SYSMETRICS_CYHSCROLL + 1, r.top + 1,
 418                 r.right - r.left - SYSMETRICS_CYHSCROLL - 2,
 419                 r.bottom - r.top - 2,
 420                 bottom_selected ? 0x0f0000 : PATCOPY );
 421         r.right = r.left + SYSMETRICS_CXVSCROLL + 1;
 422     }
 423
 424       /* Draw the thumb */
 425
 426     SelectObject( hdc, sysColorObjects.hbrushBtnFace );
 427     Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 428     InflateRect( &r, -1, -1 );
 429     GRAPH_DrawReliefRect( hdc, &r, 1, 2, FALSE );
 430 }
 431
 432
 433 /***********************************************************************
 434  *           SCROLL_DrawScrollBar
 435  *
 436  * Redraw the whole scrollbar.
 437  */
 438 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, int nBar )
 439 {
 440     WORD arrowSize, thumbPos;
 441     RECT rect;
 442     BOOL vertical;
 443
 444     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 445     if (!infoPtr) return;
 446     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 447                                         &arrowSize, &thumbPos );
 448       /* Draw the arrows */
 449
 450     if (arrowSize) SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize,
 451                                       vertical, FALSE, FALSE );
 452
 453     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 454                          infoPtr->flags, vertical, FALSE, FALSE );
 455 }
 456
 457
 458 /***********************************************************************
 459  *           SCROLL_RefreshScrollBar
 460  *
 461  * Repaint the scroll bar interior after a SetScrollRange() or
 462  * SetScrollPos() call.
 463  */
 464 static void SCROLL_RefreshScrollBar( HWND hwnd, int nBar )
 465 {
 466     WORD arrowSize, thumbPos;
 467     RECT rect;
 468     BOOL vertical;
 469     HDC hdc;
 470
 471     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 472     if (!infoPtr) return;
 473     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 474                                         &arrowSize, &thumbPos );
 475     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 476     if (!hdc) return;
 477     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 478                          infoPtr->flags, vertical, FALSE, FALSE );
 479     ReleaseDC( hwnd, hdc );
 480 }
 481
 482
 483 /***********************************************************************
 484  *           SCROLL_HandleKbdEvent
 485  *
 486  * Handle a keyboard event (only for SB_CTL scrollbars).
 487  */
 488 static void SCROLL_HandleKbdEvent( HWND hwnd, WORD wParam )
 489 {
 490     WND *wndPtr = WIN_FindWndPtr( hwnd );
 491     WORD msg;
 492
 493     switch(wParam)
 494     {
 495     case VK_PRIOR: msg = SB_PAGEUP; break;
 496     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 497     case VK_HOME:  msg = SB_TOP; break;
 498     case VK_END:   msg = SB_BOTTOM; break;
 499     case VK_UP:    msg = SB_LINEUP; break;
 500     case VK_DOWN:  msg = SB_LINEDOWN; break;
 501     default:
 502         return;
 503     }
 504     SendMessage( GetParent(hwnd),
 505                  (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 506                  msg, MAKELONG( 0, hwnd ));
 507 }
 508
 509
 510 /***********************************************************************
 511  *           SCROLL_HandleScrollEvent
 512  *
 513  * Handle a mouse or timer event for the scrollbar.
 514  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 515  * windows coordinates.
 516  */
 517 void SCROLL_HandleScrollEvent( HWND hwnd, int nBar, WORD msg, POINT pt )
 518 {
 519       /* Previous mouse position for timer events */
 520     static POINT prevPt;
 521       /* Hit test code of the last button-down event */
 522     static enum SCROLL_HITTEST trackHitTest;
 523       /* Thumb position when tracking started. */
 524     static UINT trackThumbPos;
 525       /* Position in the scroll-bar of the last button-down event. */
 526     static int lastClickPos;
 527       /* Position in the scroll-bar of the last mouse event. */
 528     static int lastMousePos;
 529
 530     enum SCROLL_HITTEST hittest;
 531     HWND hwndOwner, hwndCtl;
 532     BOOL vertical;
 533     WORD arrowSize, thumbPos;
 534     RECT rect;
 535     HDC hdc;
 536
 537     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 538     if (!infoPtr) return;
 539     if ((trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN)) return;
 540
 541     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 542     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 543                                         &arrowSize, &thumbPos );
 544     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 545     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 546
 547     switch(msg)
 548     {
 549       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 550           trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt );
 551           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 552           lastMousePos  = lastClickPos;
 553           trackThumbPos = thumbPos;
 554           prevPt = pt;
 555           SetCapture( hwnd );
 556           if (nBar == SB_CTL) SetFocus( hwnd );
 557           break;
 558
 559       case WM_MOUSEMOVE:
 560           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 561           prevPt = pt;
 562           break;
 563
 564       case WM_LBUTTONUP:
 565           hittest = SCROLL_NOWHERE;
 566           ReleaseCapture();
 567           break;
 568
 569       case WM_SYSTIMER:
 570           pt = prevPt;
 571           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 572           break;
 573
 574       default:
 575           return;  /* Should never happen */
 576     }
 577
 578     dprintf_scroll( stddeb, "ScrollBar Event: hwnd=%x bar=%d msg=%x pt=%d,%d hit=%d\n",
 579                     hwnd, nBar, msg, pt.x, pt.y, hittest );
 580
 581     switch(trackHitTest)
 582     {
 583     case SCROLL_NOWHERE:  /* No tracking in progress */
 584         break;
 585
 586     case SCROLL_TOP_ARROW:
 587         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 588                            (hittest == trackHitTest), FALSE );
 589         if (hittest == trackHitTest)
 590         {
 591             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 592                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 593                             (FARPROC)0 );
 594             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 595                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 596                              SB_LINEUP, MAKELONG( 0, hwndCtl ));
 597         }
 598         else KillSystemTimer( hwnd, SCROLL_TIMER );
 599         break;
 600
 601     case SCROLL_TOP_RECT:
 602         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 603                              infoPtr->flags, vertical,
 604                              (hittest == trackHitTest), FALSE );
 605         if (hittest == trackHitTest)
 606         {
 607             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 608                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 609                             (FARPROC)0 );
 610             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 611                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 612                              SB_PAGEUP, MAKELONG( 0, hwndCtl ));
 613         }
 614         else KillSystemTimer( hwnd, SCROLL_TIMER );
 615         break;
 616
 617     case SCROLL_THUMB:
 618         if (msg == WM_LBUTTONDOWN)
 619             SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 620                                  trackThumbPos + lastMousePos - lastClickPos );
 621         else if (msg == WM_LBUTTONUP)
 622             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 623                                  infoPtr->flags, vertical, FALSE, FALSE );
 624         else  /* WM_MOUSEMOVE */
 625         {
 626             UINT pos, val;
 627
 628             if (!PtInRect( &rect, pt )) pos = lastClickPos;
 629             else pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 630             if (pos != lastMousePos)
 631             {
 632                 SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 633                                  trackThumbPos + lastMousePos - lastClickPos );
 634                 SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 635                                        trackThumbPos + pos - lastClickPos );
 636                 lastMousePos = pos;
 637                 val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 638                                  trackThumbPos + lastMousePos - lastClickPos );
 639                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 640                              SB_THUMBTRACK, MAKELONG( val, hwndCtl ));
 641             }
 642         }
 643         break;
 644
 645     case SCROLL_BOTTOM_RECT:
 646         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 647                              infoPtr->flags, vertical,
 648                              FALSE, (hittest == trackHitTest) );
 649         if (hittest == trackHitTest)
 650         {
 651             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 652                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 653                             (FARPROC)0 );
 654             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 655                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 656                              SB_PAGEDOWN, MAKELONG( 0, hwndCtl ));
 657         }
 658         else KillSystemTimer( hwnd, SCROLL_TIMER );
 659         break;
 660
 661     case SCROLL_BOTTOM_ARROW:
 662         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 663                            FALSE, (hittest == trackHitTest) );
 664         if (hittest == trackHitTest)
 665         {
 666             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 667                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 668                             (FARPROC)0 );
 669             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 670                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 671                              SB_LINEDOWN, MAKELONG( 0, hwndCtl ));
 672         }
 673         else KillSystemTimer( hwnd, SCROLL_TIMER );
 674         break;
 675     }
 676
 677     if (msg == WM_LBUTTONUP)
 678     {
 679         if (trackHitTest == SCROLL_THUMB)
 680         {
 681             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 682                                  trackThumbPos + lastMousePos - lastClickPos );
 683             SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 684                          SB_THUMBPOSITION, MAKELONG( val, hwndCtl ) );
 685         }
 686         else
 687             SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 688                          SB_ENDSCROLL, MAKELONG( 0, hwndCtl ) );
 689         trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
 690     }
 691
 692     ReleaseDC( hwnd, hdc );
 693 }
 694
 695
 696 /***********************************************************************
 697  *           ScrollBarWndProc
 698  */
 699 LONG ScrollBarWndProc( HWND hwnd, WORD message, WORD wParam, LONG lParam )
 700 {
 701     switch(message)
 702     {
 703     case WM_CREATE:
 704         {
 705             CREATESTRUCT *lpCreat = (CREATESTRUCT *)PTR_SEG_TO_LIN(lParam);
 706             if (lpCreat->style & SBS_SIZEBOX)
 707             {
 708                 fprintf( stdnimp, "Unimplemented style SBS_SIZEBOX.\n" );
 709                 return -1;
 710             }
 711
 712             if (lpCreat->style & SBS_VERT)
 713             {
 714                 if (lpCreat->style & SBS_LEFTALIGN)
 715                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 716                                 SYSMETRICS_CXVSCROLL+1, lpCreat->cy, FALSE );
 717                 else if (lpCreat->style & SBS_RIGHTALIGN)
 718                     MoveWindow( hwnd,
 719                                 lpCreat->x+lpCreat->cx-SYSMETRICS_CXVSCROLL-1,
 720                                 lpCreat->y,
 721                                 SYSMETRICS_CXVSCROLL + 1, lpCreat->cy, FALSE );
 722             }
 723             else  /* SBS_HORZ */
 724             {
 725                 if (lpCreat->style & SBS_TOPALIGN)
 726                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 727                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 728                 else if (lpCreat->style & SBS_BOTTOMALIGN)
 729                     MoveWindow( hwnd,
 730                                 lpCreat->x,
 731                                 lpCreat->y+lpCreat->cy-SYSMETRICS_CYHSCROLL-1,
 732                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 733             }
 734         }
 735         if (!hUpArrow) SCROLL_LoadBitmaps();
 736         dprintf_scroll( stddeb, "ScrollBar creation, hwnd=%d\n", hwnd );
 737         return 0;
 738
 739     case WM_LBUTTONDOWN:
 740     case WM_LBUTTONUP:
 741     case WM_MOUSEMOVE:
 742     case WM_SYSTIMER:
 743         SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, MAKEPOINT(lParam) );
 744         break;
 745
 746     case WM_KEYDOWN:
 747         SCROLL_HandleKbdEvent( hwnd, wParam );
 748         break;
 749
 750     case WM_ERASEBKGND:
 751         break;
 752
 753     case WM_PAINT:
 754         {
 755             PAINTSTRUCT ps;
 756             HDC hdc = BeginPaint( hwnd, &ps );
 757             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL );
 758             EndPaint( hwnd, &ps );
 759         }
 760         break;
 761
 762     default:
 763         return DefWindowProc( hwnd, message, wParam, lParam );
 764     }
 765     return 0;
 766 }
 767
 768
 769 /*************************************************************************
 770  *           SetScrollPos   (USER.62)
 771  */
 772 int SetScrollPos( HWND hwnd, int nBar, int nPos, BOOL bRedraw )
 773 {
 774     SCROLLINFO *infoPtr;
 775     INT oldPos;
 776
 777     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 778
 779     dprintf_scroll( stddeb,"SetScrollPos min=%d max=%d pos=%d\n",
 780                     infoPtr->MinVal, infoPtr->MaxVal, nPos );
 781
 782     if (nPos < infoPtr->MinVal) nPos = infoPtr->MinVal;
 783     else if (nPos > infoPtr->MaxVal) nPos = infoPtr->MaxVal;
 784     oldPos = infoPtr->CurVal;
 785     infoPtr->CurVal = nPos;
 786     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 787     return oldPos;
 788 }
 789
 790
 791 /*************************************************************************
 792  *           GetScrollPos   (USER.63)
 793  */
 794 int GetScrollPos( HWND hwnd, int nBar )
 795 {
 796     SCROLLINFO *infoPtr;
 797
 798     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 799     return infoPtr->CurVal;
 800 }
 801
 802
 803 /*************************************************************************
 804  *           SetScrollRange   (USER.64)
 805  */
 806 void SetScrollRange(HWND hwnd, int nBar, int MinVal, int MaxVal, BOOL bRedraw)
 807 {
 808     SCROLLINFO *infoPtr;
 809
 810     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 811
 812     dprintf_scroll( stddeb,"SetScrollRange hwnd=%x bar=%d min=%d max=%d\n",
 813                     hwnd, nBar, MinVal, MaxVal );
 814
 815       /* Invalid range -> range is set to (0,0) */
 816     if ((MinVal > MaxVal) || ((long)MaxVal - MinVal > 32767L))
 817         MinVal = MaxVal = 0;
 818     if (infoPtr->CurVal < MinVal) infoPtr->CurVal = MinVal;
 819     else if (infoPtr->CurVal > MaxVal) infoPtr->CurVal = MaxVal;
 820     infoPtr->MinVal = MinVal;
 821     infoPtr->MaxVal = MaxVal;
 822
 823       /* Non-client scroll-bar is hidden if min==max */
 824     if (nBar != SB_CTL) ShowScrollBar( hwnd, nBar, (MinVal != MaxVal) );
 825     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 826 }
 827
 828
 829 /*************************************************************************
 830  *           GetScrollRange   (USER.65)
 831  */
 832 void GetScrollRange(HWND hwnd, int nBar, LPINT lpMin, LPINT lpMax)
 833 {
 834     SCROLLINFO *infoPtr;
 835
 836     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 837     if (lpMin) *lpMin = infoPtr->MinVal;
 838     if (lpMax) *lpMax = infoPtr->MaxVal;
 839 }
 840
 841
 842 /*************************************************************************
 843  *           ShowScrollBar   (USER.267)
 844  */
 845 void ShowScrollBar( HWND hwnd, WORD wBar, BOOL fShow )
 846 {
 847     WND *wndPtr = WIN_FindWndPtr( hwnd );
 848
 849     if (!wndPtr) return;
 850     dprintf_scroll( stddeb, "ShowScrollBar: hwnd=%x bar=%d on=%d\n", hwnd, wBar, fShow );
 851
 852     switch(wBar)
 853     {
 854     case SB_CTL:
 855         ShowWindow( hwnd, fShow ? SW_SHOW : SW_HIDE );
 856         return;
 857
 858     case SB_HORZ:
 859         if (fShow)
 860         {
 861             if (wndPtr->dwStyle & WS_HSCROLL) return;
 862             wndPtr->dwStyle |= WS_HSCROLL;
 863         }
 864         else  /* hide it */
 865         {
 866             if (!(wndPtr->dwStyle & WS_HSCROLL)) return;
 867             wndPtr->dwStyle &= ~WS_HSCROLL;
 868         }
 869         break;
 870
 871     case SB_VERT:
 872         if (fShow)
 873         {
 874             if (wndPtr->dwStyle & WS_VSCROLL) return;
 875             wndPtr->dwStyle |= WS_VSCROLL;
 876         }
 877         else  /* hide it */
 878         {
 879             if (!(wndPtr->dwStyle & WS_VSCROLL)) return;
 880             wndPtr->dwStyle &= ~WS_VSCROLL;
 881         }
 882         break;
 883
 884     case SB_BOTH:
 885         if (fShow)
 886         {
 887             if ((wndPtr->dwStyle & WS_HSCROLL)
 888                 && (wndPtr->dwStyle & WS_VSCROLL)) return;
 889             wndPtr->dwStyle |= WS_HSCROLL | WS_VSCROLL;
 890         }
 891         else  /* hide it */
 892         {
 893             if (!(wndPtr->dwStyle & WS_HSCROLL)
 894                 && !(wndPtr->dwStyle & WS_HSCROLL)) return;
 895             wndPtr->dwStyle &= ~(WS_HSCROLL | WS_VSCROLL);
 896         }
 897         break;
 898
 899     default:
 900         return;  /* Nothing to do! */
 901     }
 902     SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
 903                  | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
 904 }
 905
 906
 907 /*************************************************************************
 908  *           EnableScrollBar   (USER.482)
 909  */
 910 BOOL EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
 911 {
 912     SCROLLINFO *infoPtr;
 913     HDC hdc;
 914
 915     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
 916     dprintf_scroll( stddeb, "EnableScrollBar: %x %d %d\n", hwnd, nBar, flags );
 917     flags &= ESB_DISABLE_BOTH;
 918     if (infoPtr->flags == flags) return FALSE;
 919     infoPtr->flags = flags;
 920
 921       /* Redraw the whole scroll bar */
 922     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 923     SCROLL_DrawScrollBar( hwnd, hdc, nBar );
 924     ReleaseDC( hwnd, hdc );
 925     return TRUE;
 926 }