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