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
 344       /* Select the correct brush and pen */
 345
 346     SelectObject( hdc, sysColorObjects.hpenWindowFrame );
 347     if ((flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 348     {
 349           /* This ought to be the color of the parent window */
 350         SelectObject( hdc, sysColorObjects.hbrushWindow );
 351     }
 352     else
 353     {
 354         if (nBar == SB_CTL)  /* Only scrollbar controls send WM_CTLCOLOR */
 355         {
 356             HBRUSH hbrush = SendMessage( GetParent(hwnd), WM_CTLCOLOR, hdc,
 357                                          MAKELONG(hwnd, CTLCOLOR_SCROLLBAR) );
 358             SelectObject( hdc, hbrush );
 359         }
 360         else SelectObject( hdc, sysColorObjects.hbrushScrollbar );
 361     }
 362
 363       /* Calculate the scroll rectangle */
 364
 365     r = *rect;
 366     if (vertical)
 367     {
 368         r.top    += arrowSize;
 369         r.bottom -= arrowSize;
 370     }
 371     else
 372     {
 373         r.left  += arrowSize;
 374         r.right -= arrowSize;
 375     }
 376
 377       /* Draw the scroll bar frame */
 378
 379     MoveTo( hdc, r.left, r.top );
 380     LineTo( hdc, r.right-1, r.top );
 381     LineTo( hdc, r.right-1, r.bottom-1 );
 382     LineTo( hdc, r.left, r.bottom-1 );
 383     LineTo( hdc, r.left, r.top );
 384
 385       /* Draw the scroll rectangles and thumb */
 386
 387     if (!thumbPos)  /* No thumb to draw */
 388     {
 389         PatBlt( hdc, r.left+1, r.top+1, r.right - r.left - 2,
 390                 r.bottom - r.top - 2, PATCOPY );
 391         return;
 392     }
 393
 394     if (vertical)
 395     {
 396         PatBlt( hdc, r.left + 1, r.top + 1,
 397                 r.right - r.left - 2,
 398                 thumbPos - arrowSize,
 399                 top_selected ? 0x0f0000 : PATCOPY );
 400         r.top += thumbPos - arrowSize;
 401         PatBlt( hdc, r.left + 1, r.top + SYSMETRICS_CYHSCROLL + 1,
 402                 r.right - r.left - 2,
 403                 r.bottom - r.top - SYSMETRICS_CYHSCROLL - 2,
 404                 bottom_selected ? 0x0f0000 : PATCOPY );
 405         r.bottom = r.top + SYSMETRICS_CYHSCROLL + 1;
 406     }
 407     else  /* horizontal */
 408     {
 409         PatBlt( hdc, r.left + 1, r.top + 1,
 410                 thumbPos - arrowSize,
 411                 r.bottom - r.top - 2,
 412                 top_selected ? 0x0f0000 : PATCOPY );
 413         r.left += thumbPos - arrowSize;
 414         PatBlt( hdc, r.left + SYSMETRICS_CYHSCROLL + 1, r.top + 1,
 415                 r.right - r.left - SYSMETRICS_CYHSCROLL - 2,
 416                 r.bottom - r.top - 2,
 417                 bottom_selected ? 0x0f0000 : PATCOPY );
 418         r.right = r.left + SYSMETRICS_CXVSCROLL + 1;
 419     }
 420
 421       /* Draw the thumb */
 422
 423     SelectObject( hdc, sysColorObjects.hbrushBtnFace );
 424     Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 425     InflateRect( &r, -1, -1 );
 426     GRAPH_DrawReliefRect( hdc, &r, 1, 2, FALSE );
 427 }
 428
 429
 430 /***********************************************************************
 431  *           SCROLL_DrawScrollBar
 432  *
 433  * Redraw the whole scrollbar.
 434  */
 435 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, int nBar )
 436 {
 437     WORD arrowSize, thumbPos;
 438     RECT rect;
 439     BOOL vertical;
 440     WND *wndPtr = WIN_FindWndPtr( hwnd );
 441     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 442
 443     if (!wndPtr || !infoPtr ||
 444         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 445         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) return;
 446
 447     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 448                                         &arrowSize, &thumbPos );
 449       /* Draw the arrows */
 450
 451     if (arrowSize) SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize,
 452                                       vertical, FALSE, FALSE );
 453
 454     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 455                          infoPtr->flags, vertical, FALSE, FALSE );
 456 }
 457
 458
 459 /***********************************************************************
 460  *           SCROLL_RefreshScrollBar
 461  *
 462  * Repaint the scroll bar interior after a SetScrollRange() or
 463  * SetScrollPos() call.
 464  */
 465 static void SCROLL_RefreshScrollBar( HWND hwnd, int nBar )
 466 {
 467     WORD arrowSize, thumbPos;
 468     RECT rect;
 469     BOOL vertical;
 470     HDC hdc;
 471     WND *wndPtr = WIN_FindWndPtr( hwnd );
 472     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 473
 474     if (!wndPtr || !infoPtr ||
 475         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 476         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) return;
 477
 478     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 479                                         &arrowSize, &thumbPos );
 480     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 481     if (!hdc) return;
 482     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 483                          infoPtr->flags, vertical, FALSE, FALSE );
 484     ReleaseDC( hwnd, hdc );
 485 }
 486
 487
 488 /***********************************************************************
 489  *           SCROLL_HandleKbdEvent
 490  *
 491  * Handle a keyboard event (only for SB_CTL scrollbars).
 492  */
 493 static void SCROLL_HandleKbdEvent( HWND hwnd, WORD wParam )
 494 {
 495     WND *wndPtr = WIN_FindWndPtr( hwnd );
 496     WORD msg;
 497
 498     switch(wParam)
 499     {
 500     case VK_PRIOR: msg = SB_PAGEUP; break;
 501     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 502     case VK_HOME:  msg = SB_TOP; break;
 503     case VK_END:   msg = SB_BOTTOM; break;
 504     case VK_UP:    msg = SB_LINEUP; break;
 505     case VK_DOWN:  msg = SB_LINEDOWN; break;
 506     default:
 507         return;
 508     }
 509     SendMessage( GetParent(hwnd),
 510                  (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 511                  msg, MAKELONG( 0, hwnd ));
 512 }
 513
 514
 515 /***********************************************************************
 516  *           SCROLL_HandleScrollEvent
 517  *
 518  * Handle a mouse or timer event for the scrollbar.
 519  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 520  * windows coordinates.
 521  */
 522 void SCROLL_HandleScrollEvent( HWND hwnd, int nBar, WORD msg, POINT pt )
 523 {
 524       /* Previous mouse position for timer events */
 525     static POINT prevPt;
 526       /* Hit test code of the last button-down event */
 527     static enum SCROLL_HITTEST trackHitTest;
 528       /* Thumb position when tracking started. */
 529     static UINT trackThumbPos;
 530       /* Position in the scroll-bar of the last button-down event. */
 531     static int lastClickPos;
 532       /* Position in the scroll-bar of the last mouse event. */
 533     static int lastMousePos;
 534
 535     enum SCROLL_HITTEST hittest;
 536     HWND hwndOwner, hwndCtl;
 537     BOOL vertical;
 538     WORD arrowSize, thumbPos;
 539     RECT rect;
 540     HDC hdc;
 541
 542     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 543     if (!infoPtr) return;
 544     if ((trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN)) return;
 545
 546     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 547     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 548                                         &arrowSize, &thumbPos );
 549     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 550     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 551
 552     switch(msg)
 553     {
 554       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 555           trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt );
 556           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 557           lastMousePos  = lastClickPos;
 558           trackThumbPos = thumbPos;
 559           prevPt = pt;
 560           SetCapture( hwnd );
 561           if (nBar == SB_CTL) SetFocus( hwnd );
 562           break;
 563
 564       case WM_MOUSEMOVE:
 565           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 566           prevPt = pt;
 567           break;
 568
 569       case WM_LBUTTONUP:
 570           hittest = SCROLL_NOWHERE;
 571           ReleaseCapture();
 572           break;
 573
 574       case WM_SYSTIMER:
 575           pt = prevPt;
 576           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 577           break;
 578
 579       default:
 580           return;  /* Should never happen */
 581     }
 582
 583     dprintf_scroll( stddeb, "ScrollBar Event: hwnd=%x bar=%d msg=%x pt=%d,%d hit=%d\n",
 584                     hwnd, nBar, msg, pt.x, pt.y, hittest );
 585
 586     switch(trackHitTest)
 587     {
 588     case SCROLL_NOWHERE:  /* No tracking in progress */
 589         break;
 590
 591     case SCROLL_TOP_ARROW:
 592         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 593                            (hittest == trackHitTest), FALSE );
 594         if (hittest == trackHitTest)
 595         {
 596             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 597                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 598                             (FARPROC)0 );
 599             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 600                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 601                              SB_LINEUP, MAKELONG( 0, hwndCtl ));
 602         }
 603         else KillSystemTimer( hwnd, SCROLL_TIMER );
 604         break;
 605
 606     case SCROLL_TOP_RECT:
 607         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 608                              infoPtr->flags, vertical,
 609                              (hittest == trackHitTest), FALSE );
 610         if (hittest == trackHitTest)
 611         {
 612             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 613                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 614                             (FARPROC)0 );
 615             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 616                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 617                              SB_PAGEUP, MAKELONG( 0, hwndCtl ));
 618         }
 619         else KillSystemTimer( hwnd, SCROLL_TIMER );
 620         break;
 621
 622     case SCROLL_THUMB:
 623         if (msg == WM_LBUTTONDOWN)
 624             SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 625                                  trackThumbPos + lastMousePos - lastClickPos );
 626         else if (msg == WM_LBUTTONUP)
 627             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 628                                  infoPtr->flags, vertical, FALSE, FALSE );
 629         else  /* WM_MOUSEMOVE */
 630         {
 631             UINT pos, val;
 632
 633             if (!PtInRect( &rect, pt )) pos = lastClickPos;
 634             else pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 635             if (pos != lastMousePos)
 636             {
 637                 SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 638                                  trackThumbPos + lastMousePos - lastClickPos );
 639                 SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 640                                        trackThumbPos + pos - lastClickPos );
 641                 lastMousePos = pos;
 642                 val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 643                                  trackThumbPos + lastMousePos - lastClickPos );
 644                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 645                              SB_THUMBTRACK, MAKELONG( val, hwndCtl ));
 646             }
 647         }
 648         break;
 649
 650     case SCROLL_BOTTOM_RECT:
 651         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 652                              infoPtr->flags, vertical,
 653                              FALSE, (hittest == trackHitTest) );
 654         if (hittest == trackHitTest)
 655         {
 656             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 657                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 658                             (FARPROC)0 );
 659             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 660                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 661                              SB_PAGEDOWN, MAKELONG( 0, hwndCtl ));
 662         }
 663         else KillSystemTimer( hwnd, SCROLL_TIMER );
 664         break;
 665
 666     case SCROLL_BOTTOM_ARROW:
 667         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 668                            FALSE, (hittest == trackHitTest) );
 669         if (hittest == trackHitTest)
 670         {
 671             SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 672                             SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 673                             (FARPROC)0 );
 674             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 675                 SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 676                              SB_LINEDOWN, MAKELONG( 0, hwndCtl ));
 677         }
 678         else KillSystemTimer( hwnd, SCROLL_TIMER );
 679         break;
 680     }
 681
 682     if (msg == WM_LBUTTONUP)
 683     {
 684         if (trackHitTest == SCROLL_THUMB)
 685         {
 686             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 687                                  trackThumbPos + lastMousePos - lastClickPos );
 688             SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 689                          SB_THUMBPOSITION, MAKELONG( val, hwndCtl ) );
 690         }
 691         else
 692             SendMessage( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 693                          SB_ENDSCROLL, MAKELONG( 0, hwndCtl ) );
 694         trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
 695     }
 696
 697     ReleaseDC( hwnd, hdc );
 698 }
 699
 700
 701 /***********************************************************************
 702  *           ScrollBarWndProc
 703  */
 704 LONG ScrollBarWndProc( HWND hwnd, WORD message, WORD wParam, LONG lParam )
 705 {
 706     switch(message)
 707     {
 708     case WM_CREATE:
 709         {
 710             CREATESTRUCT *lpCreat = (CREATESTRUCT *)PTR_SEG_TO_LIN(lParam);
 711             if (lpCreat->style & SBS_SIZEBOX)
 712             {
 713                 fprintf( stdnimp, "Unimplemented style SBS_SIZEBOX.\n" );
 714                 return -1;
 715             }
 716
 717             if (lpCreat->style & SBS_VERT)
 718             {
 719                 if (lpCreat->style & SBS_LEFTALIGN)
 720                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 721                                 SYSMETRICS_CXVSCROLL+1, lpCreat->cy, FALSE );
 722                 else if (lpCreat->style & SBS_RIGHTALIGN)
 723                     MoveWindow( hwnd,
 724                                 lpCreat->x+lpCreat->cx-SYSMETRICS_CXVSCROLL-1,
 725                                 lpCreat->y,
 726                                 SYSMETRICS_CXVSCROLL + 1, lpCreat->cy, FALSE );
 727             }
 728             else  /* SBS_HORZ */
 729             {
 730                 if (lpCreat->style & SBS_TOPALIGN)
 731                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 732                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 733                 else if (lpCreat->style & SBS_BOTTOMALIGN)
 734                     MoveWindow( hwnd,
 735                                 lpCreat->x,
 736                                 lpCreat->y+lpCreat->cy-SYSMETRICS_CYHSCROLL-1,
 737                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 738             }
 739         }
 740         if (!hUpArrow) SCROLL_LoadBitmaps();
 741         dprintf_scroll( stddeb, "ScrollBar creation, hwnd=%d\n", hwnd );
 742         return 0;
 743
 744     case WM_LBUTTONDOWN:
 745     case WM_LBUTTONUP:
 746     case WM_MOUSEMOVE:
 747     case WM_SYSTIMER:
 748         SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, MAKEPOINT(lParam) );
 749         break;
 750
 751     case WM_KEYDOWN:
 752         SCROLL_HandleKbdEvent( hwnd, wParam );
 753         break;
 754
 755     case WM_ERASEBKGND:
 756         break;
 757
 758     case WM_PAINT:
 759         {
 760             PAINTSTRUCT ps;
 761             HDC hdc = BeginPaint( hwnd, &ps );
 762             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL );
 763             EndPaint( hwnd, &ps );
 764         }
 765         break;
 766
 767     default:
 768         return DefWindowProc( hwnd, message, wParam, lParam );
 769     }
 770     return 0;
 771 }
 772
 773
 774 /*************************************************************************
 775  *           SetScrollPos   (USER.62)
 776  */
 777 int SetScrollPos( HWND hwnd, int nBar, int nPos, BOOL bRedraw )
 778 {
 779     SCROLLINFO *infoPtr;
 780     INT oldPos;
 781
 782     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 783
 784     dprintf_scroll( stddeb,"SetScrollPos min=%d max=%d pos=%d\n",
 785                     infoPtr->MinVal, infoPtr->MaxVal, nPos );
 786
 787     if (nPos < infoPtr->MinVal) nPos = infoPtr->MinVal;
 788     else if (nPos > infoPtr->MaxVal) nPos = infoPtr->MaxVal;
 789     oldPos = infoPtr->CurVal;
 790     infoPtr->CurVal = nPos;
 791     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 792     return oldPos;
 793 }
 794
 795
 796 /*************************************************************************
 797  *           GetScrollPos   (USER.63)
 798  */
 799 int GetScrollPos( HWND hwnd, int nBar )
 800 {
 801     SCROLLINFO *infoPtr;
 802
 803     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 804     return infoPtr->CurVal;
 805 }
 806
 807
 808 /*************************************************************************
 809  *           SetScrollRange   (USER.64)
 810  */
 811 void SetScrollRange(HWND hwnd, int nBar, int MinVal, int MaxVal, BOOL bRedraw)
 812 {
 813     SCROLLINFO *infoPtr;
 814
 815     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 816
 817     dprintf_scroll( stddeb,"SetScrollRange hwnd=%x bar=%d min=%d max=%d\n",
 818                     hwnd, nBar, MinVal, MaxVal );
 819
 820       /* Invalid range -> range is set to (0,0) */
 821     if ((MinVal > MaxVal) || ((long)MaxVal - MinVal > 32767L))
 822         MinVal = MaxVal = 0;
 823     if (infoPtr->CurVal < MinVal) infoPtr->CurVal = MinVal;
 824     else if (infoPtr->CurVal > MaxVal) infoPtr->CurVal = MaxVal;
 825     infoPtr->MinVal = MinVal;
 826     infoPtr->MaxVal = MaxVal;
 827
 828       /* Non-client scroll-bar is hidden if min==max */
 829     if (nBar != SB_CTL) ShowScrollBar( hwnd, nBar, (MinVal != MaxVal) );
 830     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 831 }
 832
 833
 834 /*************************************************************************
 835  *           GetScrollRange   (USER.65)
 836  */
 837 void GetScrollRange(HWND hwnd, int nBar, LPINT lpMin, LPINT lpMax)
 838 {
 839     SCROLLINFO *infoPtr;
 840
 841     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 842     if (lpMin) *lpMin = infoPtr->MinVal;
 843     if (lpMax) *lpMax = infoPtr->MaxVal;
 844 }
 845
 846
 847 /*************************************************************************
 848  *           ShowScrollBar   (USER.267)
 849  */
 850 void ShowScrollBar( HWND hwnd, WORD wBar, BOOL fShow )
 851 {
 852     WND *wndPtr = WIN_FindWndPtr( hwnd );
 853
 854     if (!wndPtr) return;
 855     dprintf_scroll( stddeb, "ShowScrollBar: hwnd=%x bar=%d on=%d\n", hwnd, wBar, fShow );
 856
 857     switch(wBar)
 858     {
 859     case SB_CTL:
 860         ShowWindow( hwnd, fShow ? SW_SHOW : SW_HIDE );
 861         return;
 862
 863     case SB_HORZ:
 864         if (fShow)
 865         {
 866             if (wndPtr->dwStyle & WS_HSCROLL) return;
 867             wndPtr->dwStyle |= WS_HSCROLL;
 868         }
 869         else  /* hide it */
 870         {
 871             if (!(wndPtr->dwStyle & WS_HSCROLL)) return;
 872             wndPtr->dwStyle &= ~WS_HSCROLL;
 873         }
 874         break;
 875
 876     case SB_VERT:
 877         if (fShow)
 878         {
 879             if (wndPtr->dwStyle & WS_VSCROLL) return;
 880             wndPtr->dwStyle |= WS_VSCROLL;
 881         }
 882         else  /* hide it */
 883         {
 884             if (!(wndPtr->dwStyle & WS_VSCROLL)) return;
 885             wndPtr->dwStyle &= ~WS_VSCROLL;
 886         }
 887         break;
 888
 889     case SB_BOTH:
 890         if (fShow)
 891         {
 892             if ((wndPtr->dwStyle & WS_HSCROLL)
 893                 && (wndPtr->dwStyle & WS_VSCROLL)) return;
 894             wndPtr->dwStyle |= WS_HSCROLL | WS_VSCROLL;
 895         }
 896         else  /* hide it */
 897         {
 898             if (!(wndPtr->dwStyle & WS_HSCROLL)
 899                 && !(wndPtr->dwStyle & WS_HSCROLL)) return;
 900             wndPtr->dwStyle &= ~(WS_HSCROLL | WS_VSCROLL);
 901         }
 902         break;
 903
 904     default:
 905         return;  /* Nothing to do! */
 906     }
 907     SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
 908                  | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
 909 }
 910
 911
 912 /*************************************************************************
 913  *           EnableScrollBar   (USER.482)
 914  */
 915 BOOL EnableScrollBar( HWND hwnd, INT nBar, UINT flags )
 916 {
 917     SCROLLINFO *infoPtr;
 918     HDC hdc;
 919
 920     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
 921     dprintf_scroll( stddeb, "EnableScrollBar: %x %d %d\n", hwnd, nBar, flags );
 922     flags &= ESB_DISABLE_BOTH;
 923     if (infoPtr->flags == flags) return FALSE;
 924     infoPtr->flags = flags;
 925
 926       /* Redraw the whole scroll bar */
 927     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 928     SCROLL_DrawScrollBar( hwnd, hdc, nBar );
 929     ReleaseDC( hwnd, hdc );
 930     return TRUE;
 931 }