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 "graphics.h"
  20 #include "heap.h"
  21 #include "win.h"
  22 #include "stddebug.h"
  23 #include "debug.h"
  24
  25
  26 static HBITMAP hUpArrow = 0;
  27 static HBITMAP hDnArrow = 0;
  28 static HBITMAP hLfArrow = 0;
  29 static HBITMAP hRgArrow = 0;
  30 static HBITMAP hUpArrowD = 0;
  31 static HBITMAP hDnArrowD = 0;
  32 static HBITMAP hLfArrowD = 0;
  33 static HBITMAP hRgArrowD = 0;
  34 static HBITMAP hUpArrowI = 0;
  35 static HBITMAP hDnArrowI = 0;
  36 static HBITMAP hLfArrowI = 0;
  37 static HBITMAP hRgArrowI = 0;
  38
  39 #define TOP_ARROW(flags,pressed) \
  40    (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
  41 #define BOTTOM_ARROW(flags,pressed) \
  42    (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
  43 #define LEFT_ARROW(flags,pressed) \
  44    (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
  45 #define RIGHT_ARROW(flags,pressed) \
  46    (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))
  47
  48
  49   /* Minimum size of the rectangle between the arrows */
  50 #define SCROLL_MIN_RECT  4
  51
  52   /* Delay (in ms) before first repetition when holding the button down */
  53 #define SCROLL_FIRST_DELAY   200
  54
  55   /* Delay (in ms) between scroll repetitions */
  56 #define SCROLL_REPEAT_DELAY  100
  57
  58   /* Scroll timer id */
  59 #define SCROLL_TIMER   0
  60
  61   /* Scroll-bar hit testing */
  62 enum SCROLL_HITTEST
  63 {
  64     SCROLL_NOWHERE,      /* Outside the scroll bar */
  65     SCROLL_TOP_ARROW,    /* Top or left arrow */
  66     SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
  67     SCROLL_THUMB,        /* Thumb rectangle */
  68     SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
  69     SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
  70 };
  71
  72  /* Thumb-tracking info */
  73 static HWND hwndTracking = 0;
  74 static int nBarTracking = 0;
  75 static UINT uTrackingPos = 0;
  76
  77 /***********************************************************************
  78  *           SCROLL_LoadBitmaps
  79  */
  80 static void SCROLL_LoadBitmaps(void)
  81 {
  82     hUpArrow  = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROW));
  83     hDnArrow  = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROW));
  84     hLfArrow  = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROW));
  85     hRgArrow  = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROW));
  86     hUpArrowD = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROWD));
  87     hDnArrowD = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROWD));
  88     hLfArrowD = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROWD));
  89     hRgArrowD = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROWD));
  90     hUpArrowI = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_UPARROWI));
  91     hDnArrowI = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_DNARROWI));
  92     hLfArrowI = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_LFARROWI));
  93     hRgArrowI = LoadBitmap16((HINSTANCE)NULL, MAKEINTRESOURCE(OBM_RGARROWI));
  94 }
  95
  96
  97 /***********************************************************************
  98  *           SCROLL_GetPtrScrollInfo
  99  */
 100 static SCROLLINFO *SCROLL_GetPtrScrollInfo( WND* wndPtr, int nBar )
 101 {
 102     SCROLLINFO *infoPtr;
 103
 104     if (!wndPtr) return NULL;
 105     switch(nBar)
 106     {
 107         case SB_HORZ: infoPtr = (SCROLLINFO *)wndPtr->pHScroll; break;
 108         case SB_VERT: infoPtr = (SCROLLINFO *)wndPtr->pVScroll; break;
 109         case SB_CTL:  infoPtr = (SCROLLINFO *)wndPtr->wExtra; break;
 110         default:      return NULL;
 111     }
 112
 113     if (!infoPtr)  /* Create the info structure if needed */
 114     {
 115         if ((infoPtr = HeapAlloc( SystemHeap, 0, sizeof(SCROLLINFO) )))
 116         {
 117             infoPtr->MinVal = infoPtr->CurVal = 0;
 118             infoPtr->MaxVal = 100;
 119             infoPtr->flags  = ESB_ENABLE_BOTH;
 120             if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
 121             else wndPtr->pVScroll = infoPtr;
 122         }
 123         if (!hUpArrow) SCROLL_LoadBitmaps();
 124     }
 125     return infoPtr;
 126 }
 127
 128
 129 /***********************************************************************
 130  *           SCROLL_GetScrollInfo
 131  */
 132 static SCROLLINFO *SCROLL_GetScrollInfo( HWND hwnd, int nBar )
 133 {
 134    WND *wndPtr = WIN_FindWndPtr( hwnd );
 135    return SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 136 }
 137
 138
 139 /***********************************************************************
 140  *           SCROLL_GetScrollBarRect
 141  *
 142  * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 143  * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
 144  * 'arrowSize' returns the width or height of an arrow (depending on the
 145  * orientation of the scrollbar), and 'thumbPos' returns the position of
 146  * the thumb relative to the left or to the top.
 147  * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 148  */
 149 static BOOL SCROLL_GetScrollBarRect( HWND hwnd, int nBar, RECT16 *lprect,
 150                                      WORD *arrowSize, WORD *thumbPos )
 151 {
 152     int pixels;
 153     BOOL vertical;
 154     WND *wndPtr = WIN_FindWndPtr( hwnd );
 155
 156     switch(nBar)
 157     {
 158       case SB_HORZ:
 159         lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - 1;
 160         lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
 161         lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left +1;
 162         lprect->bottom = lprect->top + SYSMETRICS_CYHSCROLL + 1;
 163         vertical = FALSE;
 164         break;
 165
 166       case SB_VERT:
 167         lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
 168         lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top - 1;
 169         lprect->right  = lprect->left + SYSMETRICS_CXVSCROLL + 1;
 170         lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top +1;
 171         vertical = TRUE;
 172         break;
 173
 174       case SB_CTL:
 175         GetClientRect16( hwnd, lprect );
 176         vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
 177         break;
 178
 179     default:
 180         return FALSE;
 181     }
 182
 183     if (vertical) pixels = lprect->bottom - lprect->top;
 184     else pixels = lprect->right - lprect->left;
 185
 186     if (pixels > 2*SYSMETRICS_CXVSCROLL + SCROLL_MIN_RECT)
 187     {
 188         *arrowSize = SYSMETRICS_CXVSCROLL;
 189     }
 190     else if (pixels > SCROLL_MIN_RECT)
 191     {
 192         *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
 193     }
 194     else *arrowSize = 0;
 195
 196     if ((pixels -= 3*SYSMETRICS_CXVSCROLL+1) > 0)
 197     {
 198         SCROLLINFO *info = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 199         if ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 200             *thumbPos = 0;
 201         else if (info->MinVal == info->MaxVal)
 202             *thumbPos = *arrowSize;
 203         else
 204             *thumbPos = *arrowSize + pixels * (info->CurVal - info->MinVal) /
 205                                               (info->MaxVal - info->MinVal);
 206     }
 207     else *thumbPos = 0;
 208     return vertical;
 209 }
 210
 211
 212 /***********************************************************************
 213  *           SCROLL_GetThumbVal
 214  *
 215  * Compute the current scroll position based on the thumb position in pixels
 216  * from the top of the scroll-bar.
 217  */
 218 static UINT SCROLL_GetThumbVal( SCROLLINFO *infoPtr, RECT16 *rect,
 219                                 BOOL vertical, WORD pos )
 220 {
 221     int pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
 222     if ((pixels -= 3*SYSMETRICS_CXVSCROLL+1) <= 0) return infoPtr->MinVal;
 223     pos = MAX( 0, pos - SYSMETRICS_CXVSCROLL );
 224     if (pos > pixels) pos = pixels;
 225     dprintf_scroll(stddeb,"GetThumbVal: pos=%d ret=%d\n", pos,
 226                    (infoPtr->MinVal
 227             + (UINT)(((int)pos * (infoPtr->MaxVal-infoPtr->MinVal) + pixels/2)
 228                      / pixels)) );
 229     return (infoPtr->MinVal
 230             + (UINT)(((int)pos * (infoPtr->MaxVal-infoPtr->MinVal) + pixels/2)
 231                      / pixels));
 232 }
 233
 234
 235 /***********************************************************************
 236  *           SCROLL_HitTest
 237  *
 238  * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 239  */
 240 static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, int nBar, POINT16 pt )
 241 {
 242     WORD arrowSize, thumbPos;
 243     RECT16 rect;
 244
 245     BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 246                                              &arrowSize, &thumbPos );
 247     if (!PtInRect16( &rect, pt )) return SCROLL_NOWHERE;
 248
 249     if (vertical)
 250     {
 251         if (pt.y <= rect.top + arrowSize + 1) return SCROLL_TOP_ARROW;
 252         if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
 253         if (!thumbPos) return SCROLL_TOP_RECT;
 254         pt.y -= rect.top;
 255         if (pt.y < (INT)thumbPos) return SCROLL_TOP_RECT;
 256         if (pt.y > thumbPos+SYSMETRICS_CYHSCROLL) return SCROLL_BOTTOM_RECT;
 257         return SCROLL_THUMB;
 258     }
 259     else  /* horizontal */
 260     {
 261         if (pt.x <= rect.left + arrowSize) return SCROLL_TOP_ARROW;
 262         if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
 263         if (!thumbPos) return SCROLL_TOP_RECT;
 264         pt.x -= rect.left;
 265         if (pt.x < (INT)thumbPos) return SCROLL_TOP_RECT;
 266         if (pt.x > thumbPos+SYSMETRICS_CXVSCROLL) return SCROLL_BOTTOM_RECT;
 267         return SCROLL_THUMB;
 268     }
 269 }
 270
 271
 272 /***********************************************************************
 273  *           SCROLL_DrawArrows
 274  *
 275  * Draw the scroll bar arrows.
 276  */
 277 static void SCROLL_DrawArrows( HDC hdc, SCROLLINFO *infoPtr, RECT16 *rect,
 278                                WORD arrowSize, BOOL vertical,
 279                                BOOL top_pressed, BOOL bottom_pressed )
 280 {
 281     HDC hdcMem = CreateCompatibleDC( hdc );
 282     HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
 283                                     TOP_ARROW(infoPtr->flags, top_pressed)
 284                                     : LEFT_ARROW(infoPtr->flags, top_pressed));
 285     SetStretchBltMode( hdc, STRETCH_DELETESCANS );
 286     StretchBlt( hdc, rect->left, rect->top,
 287                 vertical ? rect->right-rect->left : arrowSize+1,
 288                 vertical ? arrowSize+1 : rect->bottom-rect->top,
 289                 hdcMem, 0, 0,
 290                 SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 291                 SRCCOPY );
 292
 293     SelectObject( hdcMem, vertical ?
 294                   BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
 295                   : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
 296     if (vertical)
 297         StretchBlt( hdc, rect->left, rect->bottom - arrowSize - 1,
 298                    rect->right - rect->left, arrowSize + 1,
 299                    hdcMem, 0, 0,
 300                    SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 301                    SRCCOPY );
 302     else
 303         StretchBlt( hdc, rect->right - arrowSize - 1, rect->top,
 304                    arrowSize + 1, rect->bottom - rect->top,
 305                    hdcMem, 0, 0,
 306                    SYSMETRICS_CXVSCROLL + 1, SYSMETRICS_CYHSCROLL + 1,
 307                    SRCCOPY );
 308     SelectObject( hdcMem, hbmpPrev );
 309     DeleteDC( hdcMem );
 310 }
 311
 312
 313 /***********************************************************************
 314  *           SCROLL_DrawMovingThumb
 315  *
 316  * Draw the moving thumb rectangle.
 317  */
 318 static void SCROLL_DrawMovingThumb( HDC hdc, RECT16 *rect, BOOL vertical,
 319                                     WORD arrowSize, WORD thumbPos )
 320 {
 321     RECT16 r = *rect;
 322     if (vertical)
 323     {
 324         r.top += thumbPos;
 325         if (r.top < rect->top + arrowSize) r.top = rect->top + arrowSize;
 326         if (r.top + SYSMETRICS_CYHSCROLL >= rect->bottom - arrowSize)
 327             r.top = rect->bottom - arrowSize - SYSMETRICS_CYHSCROLL - 1;
 328         r.bottom = r.top + SYSMETRICS_CYHSCROLL + 1;
 329     }
 330     else
 331     {
 332         r.left += thumbPos;
 333         if (r.left < rect->left + arrowSize) r.left = rect->left + arrowSize;
 334         if (r.left + SYSMETRICS_CXVSCROLL >= rect->right - arrowSize)
 335             r.left = rect->right - arrowSize - SYSMETRICS_CXVSCROLL - 1;
 336         r.right = r.left + SYSMETRICS_CXVSCROLL + 1;
 337     }
 338     InflateRect16( &r, -1, -1 );
 339     DrawFocusRect16( hdc, &r );
 340 }
 341
 342
 343 /***********************************************************************
 344  *           SCROLL_DrawInterior
 345  *
 346  * Draw the scroll bar interior (everything except the arrows).
 347  */
 348 static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, int nBar, RECT16 *rect,
 349                                  WORD arrowSize, WORD thumbPos, WORD flags,
 350                                  BOOL vertical, BOOL top_selected,
 351                                  BOOL bottom_selected )
 352 {
 353     RECT16 r;
 354
 355       /* Select the correct brush and pen */
 356
 357     SelectObject( hdc, sysColorObjects.hpenWindowFrame );
 358     if ((flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
 359     {
 360           /* This ought to be the color of the parent window */
 361         SelectObject( hdc, sysColorObjects.hbrushWindow );
 362     }
 363     else
 364     {
 365         if (nBar == SB_CTL)  /* Only scrollbar controls send WM_CTLCOLOR */
 366         {
 367             HBRUSH hbrush = SendMessage32A( GetParent(hwnd),
 368                                             WM_CTLCOLORSCROLLBAR, hdc, hwnd );
 369             SelectObject( hdc, hbrush );
 370         }
 371         else SelectObject( hdc, sysColorObjects.hbrushScrollbar );
 372     }
 373
 374       /* Calculate the scroll rectangle */
 375
 376     r = *rect;
 377     if (vertical)
 378     {
 379         r.top    += arrowSize;
 380         r.bottom -= arrowSize;
 381     }
 382     else
 383     {
 384         r.left  += arrowSize;
 385         r.right -= arrowSize;
 386     }
 387
 388       /* Draw the scroll bar frame */
 389
 390     MoveTo( hdc, r.left, r.top );
 391     LineTo( hdc, r.right-1, r.top );
 392     LineTo( hdc, r.right-1, r.bottom-1 );
 393     LineTo( hdc, r.left, r.bottom-1 );
 394     LineTo( hdc, r.left, r.top );
 395
 396       /* Draw the scroll rectangles and thumb */
 397
 398     if (!thumbPos)  /* No thumb to draw */
 399     {
 400         PatBlt( hdc, r.left+1, r.top+1, r.right - r.left - 2,
 401                 r.bottom - r.top - 2, PATCOPY );
 402         return;
 403     }
 404
 405     if (vertical)
 406     {
 407         PatBlt( hdc, r.left + 1, r.top + 1,
 408                 r.right - r.left - 2,
 409                 thumbPos - arrowSize,
 410                 top_selected ? 0x0f0000 : PATCOPY );
 411         r.top += thumbPos - arrowSize;
 412         PatBlt( hdc, r.left + 1, r.top + SYSMETRICS_CYHSCROLL + 1,
 413                 r.right - r.left - 2,
 414                 r.bottom - r.top - SYSMETRICS_CYHSCROLL - 2,
 415                 bottom_selected ? 0x0f0000 : PATCOPY );
 416         r.bottom = r.top + SYSMETRICS_CYHSCROLL + 1;
 417     }
 418     else  /* horizontal */
 419     {
 420         PatBlt( hdc, r.left + 1, r.top + 1,
 421                 thumbPos - arrowSize,
 422                 r.bottom - r.top - 2,
 423                 top_selected ? 0x0f0000 : PATCOPY );
 424         r.left += thumbPos - arrowSize;
 425         PatBlt( hdc, r.left + SYSMETRICS_CYHSCROLL + 1, r.top + 1,
 426                 r.right - r.left - SYSMETRICS_CYHSCROLL - 2,
 427                 r.bottom - r.top - 2,
 428                 bottom_selected ? 0x0f0000 : PATCOPY );
 429         r.right = r.left + SYSMETRICS_CXVSCROLL + 1;
 430     }
 431
 432       /* Draw the thumb */
 433
 434     SelectObject( hdc, sysColorObjects.hbrushBtnFace );
 435     Rectangle( hdc, r.left, r.top, r.right, r.bottom );
 436     InflateRect16( &r, -1, -1 );
 437     GRAPH_DrawReliefRect( hdc, &r, 1, 2, FALSE );
 438     if ((hwndTracking == hwnd) && (nBarTracking == nBar))
 439         SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, uTrackingPos);
 440 }
 441
 442
 443 /***********************************************************************
 444  *           SCROLL_DrawScrollBar
 445  *
 446  * Redraw the whole scrollbar.
 447  */
 448 void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, int nBar )
 449 {
 450     WORD arrowSize, thumbPos;
 451     RECT16 rect;
 452     BOOL vertical;
 453     WND *wndPtr = WIN_FindWndPtr( hwnd );
 454     SCROLLINFO *infoPtr = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 455
 456     if (!wndPtr || !infoPtr ||
 457         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 458         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) return;
 459
 460     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 461                                         &arrowSize, &thumbPos );
 462       /* Draw the arrows */
 463
 464     if (arrowSize) SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize,
 465                                       vertical, FALSE, FALSE );
 466
 467     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 468                          infoPtr->flags, vertical, FALSE, FALSE );
 469 }
 470
 471
 472 /***********************************************************************
 473  *           SCROLL_RefreshScrollBar
 474  *
 475  * Repaint the scroll bar interior after a SetScrollRange() or
 476  * SetScrollPos() call.
 477  */
 478 static void SCROLL_RefreshScrollBar( HWND hwnd, int nBar )
 479 {
 480     WORD arrowSize, thumbPos;
 481     RECT16 rect;
 482     BOOL vertical;
 483     HDC hdc;
 484     WND *wndPtr = WIN_FindWndPtr( hwnd );
 485     SCROLLINFO *infoPtr = SCROLL_GetPtrScrollInfo( wndPtr, nBar );
 486
 487     if (!wndPtr || !infoPtr ||
 488         ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
 489         ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) return;
 490
 491     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 492                                         &arrowSize, &thumbPos );
 493     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 494     if (!hdc) return;
 495     SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 496                          infoPtr->flags, vertical, FALSE, FALSE );
 497     ReleaseDC( hwnd, hdc );
 498 }
 499
 500
 501 /***********************************************************************
 502  *           SCROLL_HandleKbdEvent
 503  *
 504  * Handle a keyboard event (only for SB_CTL scrollbars).
 505  */
 506 static void SCROLL_HandleKbdEvent( HWND hwnd, WORD wParam )
 507 {
 508     WND *wndPtr = WIN_FindWndPtr( hwnd );
 509     WPARAM msg;
 510
 511     switch(wParam)
 512     {
 513     case VK_PRIOR: msg = SB_PAGEUP; break;
 514     case VK_NEXT:  msg = SB_PAGEDOWN; break;
 515     case VK_HOME:  msg = SB_TOP; break;
 516     case VK_END:   msg = SB_BOTTOM; break;
 517     case VK_UP:    msg = SB_LINEUP; break;
 518     case VK_DOWN:  msg = SB_LINEDOWN; break;
 519     default:
 520         return;
 521     }
 522     SendMessage32A( GetParent(hwnd),
 523                     (wndPtr->dwStyle & SBS_VERT) ? WM_VSCROLL : WM_HSCROLL,
 524                     msg, hwnd );
 525 }
 526
 527
 528 /***********************************************************************
 529  *           SCROLL_HandleScrollEvent
 530  *
 531  * Handle a mouse or timer event for the scrollbar.
 532  * 'pt' is the location of the mouse event in client (for SB_CTL) or
 533  * windows coordinates.
 534  */
 535 void SCROLL_HandleScrollEvent( HWND hwnd, int nBar, WORD msg, POINT16 pt )
 536 {
 537       /* Previous mouse position for timer events */
 538     static POINT16 prevPt;
 539       /* Hit test code of the last button-down event */
 540     static enum SCROLL_HITTEST trackHitTest;
 541       /* Thumb position when tracking started. */
 542     static UINT trackThumbPos;
 543       /* Position in the scroll-bar of the last button-down event. */
 544     static int lastClickPos;
 545       /* Position in the scroll-bar of the last mouse event. */
 546     static int lastMousePos;
 547
 548     enum SCROLL_HITTEST hittest;
 549     HWND hwndOwner, hwndCtl;
 550     BOOL vertical;
 551     WORD arrowSize, thumbPos;
 552     RECT16 rect;
 553     HDC hdc;
 554
 555     SCROLLINFO *infoPtr = SCROLL_GetScrollInfo( hwnd, nBar );
 556     if (!infoPtr) return;
 557     if ((trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN)) return;
 558
 559     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
 560     vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
 561                                         &arrowSize, &thumbPos );
 562     hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
 563     hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;
 564
 565     switch(msg)
 566     {
 567       case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
 568           trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt );
 569           lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 570           lastMousePos  = lastClickPos;
 571           trackThumbPos = thumbPos;
 572           prevPt = pt;
 573           SetCapture( hwnd );
 574           if (nBar == SB_CTL) SetFocus( hwnd );
 575           break;
 576
 577       case WM_MOUSEMOVE:
 578           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 579           prevPt = pt;
 580           break;
 581
 582       case WM_LBUTTONUP:
 583           hittest = SCROLL_NOWHERE;
 584           ReleaseCapture();
 585           break;
 586
 587       case WM_SYSTIMER:
 588           pt = prevPt;
 589           hittest = SCROLL_HitTest( hwnd, nBar, pt );
 590           break;
 591
 592       default:
 593           return;  /* Should never happen */
 594     }
 595
 596     dprintf_scroll( stddeb, "ScrollBar Event: hwnd=%04x bar=%d msg=%x pt=%d,%d hit=%d\n",
 597                     hwnd, nBar, msg, pt.x, pt.y, hittest );
 598
 599     switch(trackHitTest)
 600     {
 601     case SCROLL_NOWHERE:  /* No tracking in progress */
 602         break;
 603
 604     case SCROLL_TOP_ARROW:
 605         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 606                            (hittest == trackHitTest), FALSE );
 607         if (hittest == trackHitTest)
 608         {
 609             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 610             {
 611                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 612                                 SB_LINEUP, hwndCtl );
 613                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 614                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 615                                   (TIMERPROC32)0 );
 616             }
 617         }
 618         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 619         break;
 620
 621     case SCROLL_TOP_RECT:
 622         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 623                              infoPtr->flags, vertical,
 624                              (hittest == trackHitTest), FALSE );
 625         if (hittest == trackHitTest)
 626         {
 627             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 628             {
 629                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 630                                 SB_PAGEUP, hwndCtl );
 631                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 632                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 633                                   (TIMERPROC32)0 );
 634             }
 635         }
 636         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 637         break;
 638
 639     case SCROLL_THUMB:
 640         if (msg == WM_LBUTTONDOWN)
 641         {
 642             SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 643                                  trackThumbPos + lastMousePos - lastClickPos );
 644             hwndTracking = hwnd;
 645             nBarTracking = nBar;
 646         }
 647         else if (msg == WM_LBUTTONUP)
 648         {
 649             hwndTracking = 0;
 650             SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 651                                  infoPtr->flags, vertical, FALSE, FALSE );
 652         }
 653         else  /* WM_MOUSEMOVE */
 654         {
 655             UINT pos, val;
 656
 657             if (!PtInRect16( &rect, pt )) pos = lastClickPos;
 658             else pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
 659             if (pos != lastMousePos)
 660             {
 661                 SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize,
 662                                  trackThumbPos + lastMousePos - lastClickPos );
 663                 lastMousePos = pos;
 664                 val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 665                                  trackThumbPos + lastMousePos - lastClickPos );
 666                 /* Save tracking info */
 667                 uTrackingPos = trackThumbPos + pos - lastClickPos;
 668                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 669                                 MAKEWPARAM( SB_THUMBTRACK, val ), hwndCtl );
 670                 SCROLL_DrawMovingThumb( hdc, &rect, vertical,
 671                                         arrowSize, uTrackingPos );
 672             }
 673         }
 674         break;
 675
 676     case SCROLL_BOTTOM_RECT:
 677         SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbPos,
 678                              infoPtr->flags, vertical,
 679                              FALSE, (hittest == trackHitTest) );
 680         if (hittest == trackHitTest)
 681         {
 682             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 683             {
 684                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 685                                 SB_PAGEDOWN, hwndCtl );
 686                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 687                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 688                                   (TIMERPROC32)0 );
 689             }
 690         }
 691         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 692         break;
 693
 694     case SCROLL_BOTTOM_ARROW:
 695         SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
 696                            FALSE, (hittest == trackHitTest) );
 697         if (hittest == trackHitTest)
 698         {
 699             if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
 700             {
 701                 SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 702                                 SB_LINEDOWN, hwndCtl );
 703                 SetSystemTimer32( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
 704                                   SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
 705                                   (TIMERPROC32)0 );
 706             }
 707         }
 708         else KillSystemTimer32( hwnd, SCROLL_TIMER );
 709         break;
 710     }
 711
 712     if (msg == WM_LBUTTONUP)
 713     {
 714         if (trackHitTest == SCROLL_THUMB)
 715         {
 716             UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
 717                                  trackThumbPos + lastMousePos - lastClickPos );
 718             SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 719                             MAKEWPARAM( SB_THUMBPOSITION, val ), hwndCtl );
 720         }
 721         else
 722             SendMessage32A( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
 723                             SB_ENDSCROLL, hwndCtl );
 724         trackHitTest = SCROLL_NOWHERE;  /* Terminate tracking */
 725     }
 726
 727     ReleaseDC( hwnd, hdc );
 728 }
 729
 730
 731 /***********************************************************************
 732  *           ScrollBarWndProc
 733  */
 734 LONG ScrollBarWndProc( HWND hwnd, WORD message, WORD wParam, LONG lParam )
 735 {
 736     switch(message)
 737     {
 738     case WM_CREATE:
 739         {
 740             CREATESTRUCT16 *lpCreat = (CREATESTRUCT16 *)PTR_SEG_TO_LIN(lParam);
 741             if (lpCreat->style & SBS_SIZEBOX)
 742             {
 743                 fprintf( stdnimp, "Unimplemented style SBS_SIZEBOX.\n" );
 744                 return 0;  /* FIXME */
 745             }
 746
 747             if (lpCreat->style & SBS_VERT)
 748             {
 749                 if (lpCreat->style & SBS_LEFTALIGN)
 750                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 751                                 SYSMETRICS_CXVSCROLL+1, lpCreat->cy, FALSE );
 752                 else if (lpCreat->style & SBS_RIGHTALIGN)
 753                     MoveWindow( hwnd,
 754                                 lpCreat->x+lpCreat->cx-SYSMETRICS_CXVSCROLL-1,
 755                                 lpCreat->y,
 756                                 SYSMETRICS_CXVSCROLL + 1, lpCreat->cy, FALSE );
 757             }
 758             else  /* SBS_HORZ */
 759             {
 760                 if (lpCreat->style & SBS_TOPALIGN)
 761                     MoveWindow( hwnd, lpCreat->x, lpCreat->y,
 762                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 763                 else if (lpCreat->style & SBS_BOTTOMALIGN)
 764                     MoveWindow( hwnd,
 765                                 lpCreat->x,
 766                                 lpCreat->y+lpCreat->cy-SYSMETRICS_CYHSCROLL-1,
 767                                 lpCreat->cx, SYSMETRICS_CYHSCROLL+1, FALSE );
 768             }
 769         }
 770         if (!hUpArrow) SCROLL_LoadBitmaps();
 771         dprintf_scroll( stddeb, "ScrollBar creation, hwnd=%04x\n", hwnd );
 772         return 0;
 773
 774     case WM_LBUTTONDOWN:
 775     case WM_LBUTTONUP:
 776     case WM_MOUSEMOVE:
 777     case WM_SYSTIMER:
 778         SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, MAKEPOINT16(lParam) );
 779         break;
 780
 781     case WM_KEYDOWN:
 782         SCROLL_HandleKbdEvent( hwnd, wParam );
 783         break;
 784
 785     case WM_ERASEBKGND:
 786          return 1;
 787
 788     case WM_GETDLGCODE:
 789          return DLGC_WANTARROWS; /* Windows returns this value */
 790
 791     case WM_PAINT:
 792         {
 793             PAINTSTRUCT16 ps;
 794             HDC16 hdc = BeginPaint16( hwnd, &ps );
 795             SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL );
 796             EndPaint16( hwnd, &ps );
 797         }
 798         break;
 799
 800     case 0x400: /* SB_SETSCROLLPOS */
 801     case 0x401: /* SB_GETSCROLLPOS */
 802     case 0x402: /* SB_GETSCROLLRANGE */
 803     case 0x403: /* SB_ENABLE */
 804     case 0x404: /* SB_REDRAW */
 805         fprintf(stdnimp,"ScrollBarWndProc: undocumented message %04x, please report\n", message );
 806
 807     default:
 808         return DefWindowProc16( hwnd, message, wParam, lParam );
 809     }
 810     return 0;
 811 }
 812
 813
 814 /*************************************************************************
 815  *           SetScrollPos   (USER.62)
 816  */
 817 int SetScrollPos( HWND hwnd, int nBar, int nPos, BOOL bRedraw )
 818 {
 819     SCROLLINFO *infoPtr;
 820     INT oldPos;
 821
 822     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 823
 824     dprintf_scroll( stddeb,"SetScrollPos min=%d max=%d pos=%d\n",
 825                     infoPtr->MinVal, infoPtr->MaxVal, nPos );
 826
 827     if (nPos < infoPtr->MinVal) nPos = infoPtr->MinVal;
 828     else if (nPos > infoPtr->MaxVal) nPos = infoPtr->MaxVal;
 829     oldPos = infoPtr->CurVal;
 830     infoPtr->CurVal = nPos;
 831     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 832     return oldPos;
 833 }
 834
 835
 836 /*************************************************************************
 837  *           GetScrollPos   (USER.63)
 838  */
 839 int GetScrollPos( HWND hwnd, int nBar )
 840 {
 841     SCROLLINFO *infoPtr;
 842
 843     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return 0;
 844     return infoPtr->CurVal;
 845 }
 846
 847
 848 /*************************************************************************
 849  *           SetScrollRange   (USER.64)
 850  */
 851 void SetScrollRange(HWND hwnd, int nBar, int MinVal, int MaxVal, BOOL bRedraw)
 852 {
 853     SCROLLINFO *infoPtr;
 854
 855     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 856
 857     dprintf_scroll( stddeb,"SetScrollRange hwnd=%04x bar=%d min=%d max=%d\n",
 858                     hwnd, nBar, MinVal, MaxVal );
 859
 860       /* Invalid range -> range is set to (0,0) */
 861     if ((MinVal > MaxVal) || ((long)MaxVal - MinVal > 32767L))
 862         MinVal = MaxVal = 0;
 863     if (infoPtr->CurVal < MinVal) infoPtr->CurVal = MinVal;
 864     else if (infoPtr->CurVal > MaxVal) infoPtr->CurVal = MaxVal;
 865     infoPtr->MinVal = MinVal;
 866     infoPtr->MaxVal = MaxVal;
 867
 868       /* Non-client scroll-bar is hidden if min==max */
 869     if (nBar != SB_CTL) ShowScrollBar( hwnd, nBar, (MinVal != MaxVal) );
 870     if (bRedraw) SCROLL_RefreshScrollBar( hwnd, nBar );
 871 }
 872
 873 /*************************************************************************
 874  *           SCROLL_SetNCSbState
 875  *
 876  * This is for CalcChildScroll in windows/mdi.c
 877  */
 878 DWORD SCROLL_SetNCSbState(WND* wndPtr, int vMin, int vMax, int vPos,
 879                                        int hMin, int hMax, int hPos)
 880 {
 881   SCROLLINFO  *infoPtr = SCROLL_GetPtrScrollInfo(wndPtr, SB_VERT);
 882
 883   wndPtr->dwStyle |= (WS_VSCROLL | WS_HSCROLL);
 884
 885   if( vMin >= vMax )
 886     { vMin = vMax;
 887       wndPtr->dwStyle &= ~WS_VSCROLL; }
 888   if( vPos > vMax ) vPos = vMax; else if( vPos < vMin ) vPos = vMin;
 889   infoPtr->MinVal = vMin;
 890   infoPtr->MaxVal = vMax;
 891   infoPtr->CurVal = vPos;
 892
 893   infoPtr = SCROLL_GetPtrScrollInfo(wndPtr, SB_HORZ);
 894
 895   if( hMin >= hMax )
 896     { hMin = hMax;
 897       wndPtr->dwStyle &= ~WS_HSCROLL; }
 898   if( hPos > hMax ) hPos = hMax; else if( hPos < hMin ) hPos = hMin;
 899   infoPtr->MinVal = hMin;
 900   infoPtr->MaxVal = hMax;
 901   infoPtr->CurVal = hPos;
 902
 903   return wndPtr->dwStyle & (WS_VSCROLL | WS_HSCROLL);
 904 }
 905
 906 /*************************************************************************
 907  *           GetScrollRange   (USER.65)
 908  */
 909 void GetScrollRange(HWND hwnd, int nBar, LPINT16 lpMin, LPINT16 lpMax)
 910 {
 911     SCROLLINFO *infoPtr;
 912
 913     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return;
 914     if (lpMin) *lpMin = infoPtr->MinVal;
 915     if (lpMax) *lpMax = infoPtr->MaxVal;
 916 }
 917
 918
 919 /*************************************************************************
 920  *           ShowScrollBar   (USER.267)
 921  */
 922 void ShowScrollBar( HWND hwnd, WORD wBar, BOOL fShow )
 923 {
 924     WND *wndPtr = WIN_FindWndPtr( hwnd );
 925
 926     if (!wndPtr) return;
 927     dprintf_scroll( stddeb, "ShowScrollBar: hwnd=%04x bar=%d on=%d\n", hwnd, wBar, fShow );
 928
 929     switch(wBar)
 930     {
 931     case SB_CTL:
 932         ShowWindow( hwnd, fShow ? SW_SHOW : SW_HIDE );
 933         return;
 934
 935     case SB_HORZ:
 936         if (fShow)
 937         {
 938             if (wndPtr->dwStyle & WS_HSCROLL) return;
 939             wndPtr->dwStyle |= WS_HSCROLL;
 940         }
 941         else  /* hide it */
 942         {
 943             if (!(wndPtr->dwStyle & WS_HSCROLL)) return;
 944             wndPtr->dwStyle &= ~WS_HSCROLL;
 945         }
 946         break;
 947
 948     case SB_VERT:
 949         if (fShow)
 950         {
 951             if (wndPtr->dwStyle & WS_VSCROLL) return;
 952             wndPtr->dwStyle |= WS_VSCROLL;
 953         }
 954         else  /* hide it */
 955         {
 956             if (!(wndPtr->dwStyle & WS_VSCROLL)) return;
 957             wndPtr->dwStyle &= ~WS_VSCROLL;
 958         }
 959         break;
 960
 961     case SB_BOTH:
 962         if (fShow)
 963         {
 964             if ((wndPtr->dwStyle & WS_HSCROLL)
 965                 && (wndPtr->dwStyle & WS_VSCROLL)) return;
 966             wndPtr->dwStyle |= WS_HSCROLL | WS_VSCROLL;
 967         }
 968         else  /* hide it */
 969         {
 970             if (!(wndPtr->dwStyle & WS_HSCROLL)
 971                 && !(wndPtr->dwStyle & WS_HSCROLL)) return;
 972             wndPtr->dwStyle &= ~(WS_HSCROLL | WS_VSCROLL);
 973         }
 974         break;
 975
 976     default:
 977         return;  /* Nothing to do! */
 978     }
 979     SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
 980                  | SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
 981 }
 982
 983
 984 /*************************************************************************
 985  *           EnableScrollBar   (USER.482)
 986  */
 987 BOOL EnableScrollBar( HWND hwnd, UINT nBar, UINT flags )
 988 {
 989     SCROLLINFO *infoPtr;
 990     HDC hdc;
 991
 992     if (!(infoPtr = SCROLL_GetScrollInfo( hwnd, nBar ))) return FALSE;
 993     dprintf_scroll( stddeb, "EnableScrollBar: %04x %d %d\n", hwnd, nBar, flags );
 994     flags &= ESB_DISABLE_BOTH;
 995     if (infoPtr->flags == flags) return FALSE;
 996     infoPtr->flags = flags;
 997
 998       /* Redraw the whole scroll bar */
 999     hdc = (nBar == SB_CTL) ? GetDC(hwnd) : GetWindowDC(hwnd);
1000     SCROLL_DrawScrollBar( hwnd, hdc, nBar );
1001     ReleaseDC( hwnd, hdc );
1002     return TRUE;
1003 }