dlls/comctl32/pager.c

   1 /*
   2  * Pager control
   3  *
   4  * Copyright 1998, 1999 Eric Kohl
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * NOTES
  21  *
  22  * This code was audited for completeness against the documented features
  23  * of Comctl32.dll version 6.0 on Sep. 18, 2004, by Robert Shearman.
  24  *
  25  * Unless otherwise noted, we believe this code to be complete, as per
  26  * the specification mentioned above.
  27  * If you discover missing features or bugs please note them below.
  28  *
  29  * TODO:
  30  *    Implement repetitive button press.
  31  *    Adjust arrow size relative to size of button.
  32  *    Allow border size changes.
  33  *    Styles:
  34  *      PGS_DRAGNDROP
  35  *    Notifications:
  36  *      PGN_HOTITEMCHANGE
  37  *    Messages:
  38  *      WM_PRINT and/or WM_PRINTCLIENT
  39  *
  40  * TESTING:
  41  *    Tested primarily with the controlspy Pager application.
  42  *       Susan Farley (susan@codeweavers.com)
  43  *
  44  * IMPLEMENTATION NOTES:
  45  *    This control uses WM_NCPAINT instead of WM_PAINT to paint itself
  46  *    as we need to scroll a child window. In order to do this we move
  47  *    the child window in the control's client area, using the clipping
  48  *    region that is automatically set around the client area. As the
  49  *    entire client area now consists of the child window, we must
  50  *    allocate space (WM_NCCALCSIZE) for the buttons and draw them as
  51  *    a non-client area (WM_NCPAINT).
  52  *       Robert Shearman <rob@codeweavers.com>
  53  */
  54
  55 #include <stdarg.h>
  56 #include <string.h>
  57 #include "windef.h"
  58 #include "winbase.h"
  59 #include "wingdi.h"
  60 #include "winuser.h"
  61 #include "winnls.h"
  62 #include "commctrl.h"
  63 #include "comctl32.h"
  64 #include "wine/debug.h"
  65
  66 WINE_DEFAULT_DEBUG_CHANNEL(pager);
  67
  68 typedef struct
  69 {
  70     HWND   hwndSelf;   /* handle of the control wnd */
  71     HWND   hwndChild;  /* handle of the contained wnd */
  72     HWND   hwndNotify; /* handle of the parent wnd */
  73     DWORD  dwStyle;    /* styles for this control */
  74     COLORREF clrBk;    /* background color */
  75     INT    nBorder;    /* border size for the control */
  76     INT    nButtonSize;/* size of the pager btns */
  77     INT    nPos;       /* scroll position */
  78     INT    nWidth;     /* from child wnd's response to PGN_CALCSIZE */
  79     INT    nHeight;    /* from child wnd's response to PGN_CALCSIZE */
  80     BOOL   bForward;   /* forward WM_MOUSEMOVE msgs to the contained wnd */
  81     BOOL   bCapture;   /* we have captured the mouse  */
  82     INT    TLbtnState; /* state of top or left btn */
  83     INT    BRbtnState; /* state of bottom or right btn */
  84     INT    direction;  /* direction of the scroll, (e.g. PGF_SCROLLUP) */
  85 } PAGER_INFO;
  86
  87 #define TIMERID1         1
  88 #define TIMERID2         2
  89 #define INITIAL_DELAY    500
  90 #define REPEAT_DELAY     50
  91
  92 static void
  93 PAGER_GetButtonRects(const PAGER_INFO* infoPtr, RECT* prcTopLeft, RECT* prcBottomRight, BOOL bClientCoords)
  94 {
  95     RECT rcWindow;
  96     GetWindowRect (infoPtr->hwndSelf, &rcWindow);
  97
  98     if (bClientCoords)
  99         MapWindowPoints( 0, infoPtr->hwndSelf, (POINT *)&rcWindow, 2 );
 100     else
 101         OffsetRect(&rcWindow, -rcWindow.left, -rcWindow.top);
 102
 103     *prcTopLeft = *prcBottomRight = rcWindow;
 104     if (infoPtr->dwStyle & PGS_HORZ)
 105     {
 106         prcTopLeft->right = prcTopLeft->left + infoPtr->nButtonSize;
 107         prcBottomRight->left = prcBottomRight->right - infoPtr->nButtonSize;
 108     }
 109     else
 110     {
 111         prcTopLeft->bottom = prcTopLeft->top + infoPtr->nButtonSize;
 112         prcBottomRight->top = prcBottomRight->bottom - infoPtr->nButtonSize;
 113     }
 114 }
 115
 116 static void
 117 PAGER_DrawButton(HDC hdc, COLORREF clrBk, RECT rc,
 118                  BOOL horz, BOOL topLeft, INT btnState)
 119 {
 120     UINT flags;
 121
 122     TRACE("rc = %s, btnState = %d\n", wine_dbgstr_rect(&rc), btnState);
 123
 124     if (btnState == PGF_INVISIBLE)
 125         return;
 126
 127     if ((rc.right - rc.left <= 0) || (rc.bottom - rc.top <= 0))
 128         return;
 129
 130     if (horz)
 131         flags = topLeft ? DFCS_SCROLLLEFT : DFCS_SCROLLRIGHT;
 132     else
 133         flags = topLeft ? DFCS_SCROLLUP : DFCS_SCROLLDOWN;
 134
 135     switch (btnState)
 136     {
 137     case PGF_HOT:
 138         break;
 139     case PGF_NORMAL:
 140         flags |= DFCS_FLAT;
 141         break;
 142     case PGF_DEPRESSED:
 143         flags |= DFCS_PUSHED;
 144         break;
 145     case PGF_GRAYED:
 146         flags |= DFCS_INACTIVE | DFCS_FLAT;
 147         break;
 148     }
 149     DrawFrameControl( hdc, &rc, DFC_SCROLL, flags );
 150 }
 151
 152 /* << PAGER_GetDropTarget >> */
 153
 154 static inline LRESULT
 155 PAGER_ForwardMouse (PAGER_INFO* infoPtr, BOOL bFwd)
 156 {
 157     TRACE("[%p]\n", infoPtr->hwndSelf);
 158
 159     infoPtr->bForward = bFwd;
 160
 161     return 0;
 162 }
 163
 164 static inline LRESULT
 165 PAGER_GetButtonState (const PAGER_INFO* infoPtr, INT btn)
 166 {
 167     LRESULT btnState = PGF_INVISIBLE;
 168     TRACE("[%p]\n", infoPtr->hwndSelf);
 169
 170     if (btn == PGB_TOPORLEFT)
 171         btnState = infoPtr->TLbtnState;
 172     else if (btn == PGB_BOTTOMORRIGHT)
 173         btnState = infoPtr->BRbtnState;
 174
 175     return btnState;
 176 }
 177
 178
 179 static inline INT
 180 PAGER_GetPos(const PAGER_INFO *infoPtr)
 181 {
 182     TRACE("[%p] returns %d\n", infoPtr->hwndSelf, infoPtr->nPos);
 183     return infoPtr->nPos;
 184 }
 185
 186 static inline INT
 187 PAGER_GetButtonSize(const PAGER_INFO *infoPtr)
 188 {
 189     TRACE("[%p] returns %d\n", infoPtr->hwndSelf, infoPtr->nButtonSize);
 190     return infoPtr->nButtonSize;
 191 }
 192
 193 static inline INT
 194 PAGER_GetBorder(const PAGER_INFO *infoPtr)
 195 {
 196     TRACE("[%p] returns %d\n", infoPtr->hwndSelf, infoPtr->nBorder);
 197     return infoPtr->nBorder;
 198 }
 199
 200 static inline COLORREF
 201 PAGER_GetBkColor(const PAGER_INFO *infoPtr)
 202 {
 203     TRACE("[%p] returns %06x\n", infoPtr->hwndSelf, infoPtr->clrBk);
 204     return infoPtr->clrBk;
 205 }
 206
 207 static void
 208 PAGER_CalcSize( PAGER_INFO *infoPtr )
 209 {
 210     NMPGCALCSIZE nmpgcs;
 211     ZeroMemory (&nmpgcs, sizeof (NMPGCALCSIZE));
 212     nmpgcs.hdr.hwndFrom = infoPtr->hwndSelf;
 213     nmpgcs.hdr.idFrom   = GetWindowLongPtrW (infoPtr->hwndSelf, GWLP_ID);
 214     nmpgcs.hdr.code = PGN_CALCSIZE;
 215     nmpgcs.dwFlag = (infoPtr->dwStyle & PGS_HORZ) ? PGF_CALCWIDTH : PGF_CALCHEIGHT;
 216     nmpgcs.iWidth = infoPtr->nWidth;
 217     nmpgcs.iHeight = infoPtr->nHeight;
 218     SendMessageW (infoPtr->hwndNotify, WM_NOTIFY, nmpgcs.hdr.idFrom, (LPARAM)&nmpgcs);
 219
 220     if (infoPtr->dwStyle & PGS_HORZ)
 221         infoPtr->nWidth = nmpgcs.iWidth;
 222     else
 223         infoPtr->nHeight = nmpgcs.iHeight;
 224
 225     TRACE("[%p] PGN_CALCSIZE returns %dx%d\n", infoPtr->hwndSelf, nmpgcs.iWidth, nmpgcs.iHeight );
 226 }
 227
 228 static void
 229 PAGER_PositionChildWnd(PAGER_INFO* infoPtr)
 230 {
 231     if (infoPtr->hwndChild)
 232     {
 233         RECT rcClient;
 234         int nPos = infoPtr->nPos;
 235
 236         /* compensate for a grayed btn, which will soon become invisible */
 237         if (infoPtr->TLbtnState == PGF_GRAYED)
 238             nPos += infoPtr->nButtonSize;
 239
 240         GetClientRect(infoPtr->hwndSelf, &rcClient);
 241
 242         if (infoPtr->dwStyle & PGS_HORZ)
 243         {
 244             int wndSize = max(0, rcClient.right - rcClient.left);
 245             if (infoPtr->nWidth < wndSize)
 246                 infoPtr->nWidth = wndSize;
 247
 248             TRACE("[%p] SWP %dx%d at (%d,%d)\n", infoPtr->hwndSelf,
 249                          infoPtr->nWidth, infoPtr->nHeight,
 250                          -nPos, 0);
 251             SetWindowPos(infoPtr->hwndChild, 0,
 252                          -nPos, 0,
 253                          infoPtr->nWidth, infoPtr->nHeight,
 254                          SWP_NOZORDER);
 255         }
 256         else
 257         {
 258             int wndSize = max(0, rcClient.bottom - rcClient.top);
 259             if (infoPtr->nHeight < wndSize)
 260                 infoPtr->nHeight = wndSize;
 261
 262             TRACE("[%p] SWP %dx%d at (%d,%d)\n", infoPtr->hwndSelf,
 263                          infoPtr->nWidth, infoPtr->nHeight,
 264                          0, -nPos);
 265             SetWindowPos(infoPtr->hwndChild, 0,
 266                          0, -nPos,
 267                          infoPtr->nWidth, infoPtr->nHeight,
 268                          SWP_NOZORDER);
 269         }
 270
 271         InvalidateRect(infoPtr->hwndChild, NULL, TRUE);
 272     }
 273 }
 274
 275 static INT
 276 PAGER_GetScrollRange(PAGER_INFO* infoPtr)
 277 {
 278     INT scrollRange = 0;
 279
 280     if (infoPtr->hwndChild)
 281     {
 282         INT wndSize, childSize;
 283         RECT wndRect;
 284         GetWindowRect(infoPtr->hwndSelf, &wndRect);
 285
 286         PAGER_CalcSize(infoPtr);
 287         if (infoPtr->dwStyle & PGS_HORZ)
 288         {
 289             wndSize = wndRect.right - wndRect.left;
 290             childSize = infoPtr->nWidth;
 291         }
 292         else
 293         {
 294             wndSize = wndRect.bottom - wndRect.top;
 295             childSize = infoPtr->nHeight;
 296         }
 297
 298         TRACE("childSize = %d,  wndSize = %d\n", childSize, wndSize);
 299         if (childSize > wndSize)
 300             scrollRange = childSize - wndSize + infoPtr->nButtonSize;
 301     }
 302
 303     TRACE("[%p] returns %d\n", infoPtr->hwndSelf, scrollRange);
 304     return scrollRange;
 305 }
 306
 307 static void
 308 PAGER_UpdateBtns(PAGER_INFO *infoPtr, INT scrollRange, BOOL hideGrayBtns)
 309 {
 310     BOOL resizeClient;
 311     BOOL repaintBtns;
 312     INT oldTLbtnState = infoPtr->TLbtnState;
 313     INT oldBRbtnState = infoPtr->BRbtnState;
 314     POINT pt;
 315     RECT rcTopLeft, rcBottomRight;
 316
 317     /* get button rects */
 318     PAGER_GetButtonRects(infoPtr, &rcTopLeft, &rcBottomRight, TRUE);
 319
 320     GetCursorPos(&pt);
 321     ScreenToClient( infoPtr->hwndSelf, &pt );
 322
 323     /* update states based on scroll position */
 324     if (infoPtr->nPos > 0)
 325     {
 326         if (infoPtr->TLbtnState == PGF_INVISIBLE || infoPtr->TLbtnState == PGF_GRAYED)
 327             infoPtr->TLbtnState = PGF_NORMAL;
 328     }
 329     else if (!hideGrayBtns && PtInRect(&rcTopLeft, pt))
 330         infoPtr->TLbtnState = PGF_GRAYED;
 331     else
 332         infoPtr->TLbtnState = PGF_INVISIBLE;
 333
 334     if (scrollRange <= 0)
 335     {
 336         infoPtr->TLbtnState = PGF_INVISIBLE;
 337         infoPtr->BRbtnState = PGF_INVISIBLE;
 338     }
 339     else if (infoPtr->nPos < scrollRange)
 340     {
 341         if (infoPtr->BRbtnState == PGF_INVISIBLE || infoPtr->BRbtnState == PGF_GRAYED)
 342             infoPtr->BRbtnState = PGF_NORMAL;
 343     }
 344     else if (!hideGrayBtns && PtInRect(&rcBottomRight, pt))
 345         infoPtr->BRbtnState = PGF_GRAYED;
 346     else
 347         infoPtr->BRbtnState = PGF_INVISIBLE;
 348
 349     /* only need to resize when entering or leaving PGF_INVISIBLE state */
 350     resizeClient =
 351         ((oldTLbtnState == PGF_INVISIBLE) != (infoPtr->TLbtnState == PGF_INVISIBLE)) ||
 352         ((oldBRbtnState == PGF_INVISIBLE) != (infoPtr->BRbtnState == PGF_INVISIBLE));
 353     /* initiate NCCalcSize to resize client wnd if necessary */
 354     if (resizeClient)
 355         SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 356                      SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 357                      SWP_NOZORDER | SWP_NOACTIVATE);
 358
 359     /* repaint when changing any state */
 360     repaintBtns = (oldTLbtnState != infoPtr->TLbtnState) ||
 361                   (oldBRbtnState != infoPtr->BRbtnState);
 362     if (repaintBtns)
 363         SendMessageW(infoPtr->hwndSelf, WM_NCPAINT, 0, 0);
 364 }
 365
 366 static LRESULT
 367 PAGER_SetPos(PAGER_INFO* infoPtr, INT newPos, BOOL fromBtnPress)
 368 {
 369     INT scrollRange = PAGER_GetScrollRange(infoPtr);
 370     INT oldPos = infoPtr->nPos;
 371
 372     if ((scrollRange <= 0) || (newPos < 0))
 373         infoPtr->nPos = 0;
 374     else if (newPos > scrollRange)
 375         infoPtr->nPos = scrollRange;
 376     else
 377         infoPtr->nPos = newPos;
 378
 379     TRACE("[%p] pos=%d, oldpos=%d\n", infoPtr->hwndSelf, infoPtr->nPos, oldPos);
 380
 381     if (infoPtr->nPos != oldPos)
 382     {
 383         /* gray and restore btns, and if from WM_SETPOS, hide the gray btns */
 384         PAGER_UpdateBtns(infoPtr, scrollRange, !fromBtnPress);
 385         PAGER_PositionChildWnd(infoPtr);
 386     }
 387
 388     return 0;
 389 }
 390
 391 /******************************************************************
 392  * For the PGM_RECALCSIZE message (but not the other uses in      *
 393  * this module), the native control does only the following:      *
 394  *                                                                *
 395  *    if (some condition)                                         *
 396  *          PostMessageW(hwnd, EM_FMTLINES, 0, 0);                *
 397  *    return DefWindowProcW(hwnd, PGM_RECALCSIZE, 0, 0);          *
 398  *                                                                *
 399  * When we figure out what the "some condition" is we will        *
 400  * implement that for the message processing.                     *
 401  ******************************************************************/
 402
 403 static LRESULT
 404 PAGER_RecalcSize(PAGER_INFO *infoPtr)
 405 {
 406     TRACE("[%p]\n", infoPtr->hwndSelf);
 407
 408     if (infoPtr->hwndChild)
 409     {
 410         INT scrollRange = PAGER_GetScrollRange(infoPtr);
 411
 412         if (scrollRange <= 0)
 413         {
 414             infoPtr->nPos = -1;
 415             PAGER_SetPos(infoPtr, 0, FALSE);
 416         }
 417         else
 418             PAGER_PositionChildWnd(infoPtr);
 419     }
 420
 421     return 1;
 422 }
 423
 424
 425 static COLORREF
 426 PAGER_SetBkColor (PAGER_INFO* infoPtr, COLORREF clrBk)
 427 {
 428     COLORREF clrTemp = infoPtr->clrBk;
 429
 430     infoPtr->clrBk = clrBk;
 431     TRACE("[%p] %06x\n", infoPtr->hwndSelf, infoPtr->clrBk);
 432
 433     /* the native control seems to do things this way */
 434     SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 435                  SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 436                  SWP_NOZORDER | SWP_NOACTIVATE);
 437
 438     RedrawWindow(infoPtr->hwndSelf, 0, 0, RDW_ERASE | RDW_INVALIDATE);
 439
 440     return clrTemp;
 441 }
 442
 443
 444 static INT
 445 PAGER_SetBorder (PAGER_INFO* infoPtr, INT iBorder)
 446 {
 447     INT nTemp = infoPtr->nBorder;
 448
 449     infoPtr->nBorder = iBorder;
 450     TRACE("[%p] %d\n", infoPtr->hwndSelf, infoPtr->nBorder);
 451
 452     PAGER_RecalcSize(infoPtr);
 453
 454     return nTemp;
 455 }
 456
 457
 458 static INT
 459 PAGER_SetButtonSize (PAGER_INFO* infoPtr, INT iButtonSize)
 460 {
 461     INT nTemp = infoPtr->nButtonSize;
 462
 463     infoPtr->nButtonSize = iButtonSize;
 464     TRACE("[%p] %d\n", infoPtr->hwndSelf, infoPtr->nButtonSize);
 465
 466     PAGER_RecalcSize(infoPtr);
 467
 468     return nTemp;
 469 }
 470
 471
 472 static LRESULT
 473 PAGER_SetChild (PAGER_INFO* infoPtr, HWND hwndChild)
 474 {
 475     infoPtr->hwndChild = IsWindow (hwndChild) ? hwndChild : 0;
 476
 477     if (infoPtr->hwndChild)
 478     {
 479         TRACE("[%p] hwndChild=%p\n", infoPtr->hwndSelf, infoPtr->hwndChild);
 480
 481         SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 482                      SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
 483
 484         /* position child within the page scroller */
 485         SetWindowPos(infoPtr->hwndChild, HWND_TOP,
 486                      0,0,0,0,
 487                      SWP_SHOWWINDOW | SWP_NOSIZE);  /* native is 0 */
 488
 489         infoPtr->nPos = -1;
 490         PAGER_SetPos(infoPtr, 0, FALSE);
 491     }
 492
 493     return 0;
 494 }
 495
 496 static void
 497 PAGER_Scroll(PAGER_INFO* infoPtr, INT dir)
 498 {
 499     NMPGSCROLL nmpgScroll;
 500     RECT rcWnd;
 501
 502     if (infoPtr->hwndChild)
 503     {
 504         ZeroMemory (&nmpgScroll, sizeof (NMPGSCROLL));
 505         nmpgScroll.hdr.hwndFrom = infoPtr->hwndSelf;
 506         nmpgScroll.hdr.idFrom   = GetWindowLongPtrW (infoPtr->hwndSelf, GWLP_ID);
 507         nmpgScroll.hdr.code = PGN_SCROLL;
 508
 509         GetWindowRect(infoPtr->hwndSelf, &rcWnd);
 510         GetClientRect(infoPtr->hwndSelf, &nmpgScroll.rcParent);
 511         nmpgScroll.iXpos = nmpgScroll.iYpos = 0;
 512         nmpgScroll.iDir = dir;
 513
 514         if (infoPtr->dwStyle & PGS_HORZ)
 515         {
 516             nmpgScroll.iScroll = rcWnd.right - rcWnd.left;
 517             nmpgScroll.iXpos = infoPtr->nPos;
 518         }
 519         else
 520         {
 521             nmpgScroll.iScroll = rcWnd.bottom - rcWnd.top;
 522             nmpgScroll.iYpos = infoPtr->nPos;
 523         }
 524         nmpgScroll.iScroll -= 2*infoPtr->nButtonSize;
 525
 526         SendMessageW (infoPtr->hwndNotify, WM_NOTIFY, nmpgScroll.hdr.idFrom, (LPARAM)&nmpgScroll);
 527
 528         TRACE("[%p] PGN_SCROLL returns iScroll=%d\n", infoPtr->hwndSelf, nmpgScroll.iScroll);
 529
 530         if (nmpgScroll.iScroll > 0)
 531         {
 532             infoPtr->direction = dir;
 533
 534             if (dir == PGF_SCROLLLEFT || dir == PGF_SCROLLUP)
 535                 PAGER_SetPos(infoPtr, infoPtr->nPos - nmpgScroll.iScroll, TRUE);
 536             else
 537                 PAGER_SetPos(infoPtr, infoPtr->nPos + nmpgScroll.iScroll, TRUE);
 538         }
 539         else
 540             infoPtr->direction = -1;
 541     }
 542 }
 543
 544 static LRESULT
 545 PAGER_FmtLines(const PAGER_INFO *infoPtr)
 546 {
 547     /* initiate NCCalcSize to resize client wnd and get size */
 548     SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 549                  SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 550                  SWP_NOZORDER | SWP_NOACTIVATE);
 551
 552     SetWindowPos(infoPtr->hwndChild, 0,
 553                  0,0,infoPtr->nWidth,infoPtr->nHeight,
 554                  0);
 555
 556     return DefWindowProcW (infoPtr->hwndSelf, EM_FMTLINES, 0, 0);
 557 }
 558
 559 static LRESULT
 560 PAGER_Create (HWND hwnd, const CREATESTRUCTW *lpcs)
 561 {
 562     PAGER_INFO *infoPtr;
 563
 564     /* allocate memory for info structure */
 565     infoPtr = Alloc (sizeof(PAGER_INFO));
 566     if (!infoPtr) return -1;
 567     SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
 568
 569     /* set default settings */
 570     infoPtr->hwndSelf = hwnd;
 571     infoPtr->hwndChild = NULL;
 572     infoPtr->hwndNotify = lpcs->hwndParent;
 573     infoPtr->dwStyle = lpcs->style;
 574     infoPtr->clrBk = GetSysColor(COLOR_BTNFACE);
 575     infoPtr->nBorder = 0;
 576     infoPtr->nButtonSize = 12;
 577     infoPtr->nPos = 0;
 578     infoPtr->nWidth = 0;
 579     infoPtr->nHeight = 0;
 580     infoPtr->bForward = FALSE;
 581     infoPtr->bCapture = FALSE;
 582     infoPtr->TLbtnState = PGF_INVISIBLE;
 583     infoPtr->BRbtnState = PGF_INVISIBLE;
 584     infoPtr->direction = -1;
 585
 586     if (infoPtr->dwStyle & PGS_DRAGNDROP)
 587         FIXME("[%p] Drag and Drop style is not implemented yet.\n", infoPtr->hwndSelf);
 588
 589     return 0;
 590 }
 591
 592
 593 static LRESULT
 594 PAGER_Destroy (PAGER_INFO *infoPtr)
 595 {
 596     SetWindowLongPtrW (infoPtr->hwndSelf, 0, 0);
 597     Free (infoPtr);  /* free pager info data */
 598     return 0;
 599 }
 600
 601 static LRESULT
 602 PAGER_NCCalcSize(PAGER_INFO* infoPtr, WPARAM wParam, LPRECT lpRect)
 603 {
 604     RECT rcChild, rcWindow;
 605
 606     /*
 607      * lpRect points to a RECT struct.  On entry, the struct
 608      * contains the proposed wnd rectangle for the window.
 609      * On exit, the struct should contain the screen
 610      * coordinates of the corresponding window's client area.
 611      */
 612
 613     DefWindowProcW (infoPtr->hwndSelf, WM_NCCALCSIZE, wParam, (LPARAM)lpRect);
 614
 615     TRACE("orig rect=%s\n", wine_dbgstr_rect(lpRect));
 616
 617     GetWindowRect (infoPtr->hwndChild, &rcChild);
 618     MapWindowPoints (0, infoPtr->hwndSelf, (LPPOINT)&rcChild, 2); /* FIXME: RECT != 2 POINTS */
 619     GetWindowRect (infoPtr->hwndSelf, &rcWindow);
 620
 621     infoPtr->nWidth = lpRect->right - lpRect->left;
 622     infoPtr->nHeight = lpRect->bottom - lpRect->top;
 623     PAGER_CalcSize( infoPtr );
 624
 625     if (infoPtr->dwStyle & PGS_HORZ)
 626     {
 627         if (infoPtr->TLbtnState && (lpRect->left + infoPtr->nButtonSize < lpRect->right))
 628             lpRect->left += infoPtr->nButtonSize;
 629         if (infoPtr->BRbtnState && (lpRect->right - infoPtr->nButtonSize > lpRect->left))
 630             lpRect->right -= infoPtr->nButtonSize;
 631     }
 632     else
 633     {
 634         if (infoPtr->TLbtnState && (lpRect->top + infoPtr->nButtonSize < lpRect->bottom))
 635             lpRect->top += infoPtr->nButtonSize;
 636         if (infoPtr->BRbtnState && (lpRect->bottom - infoPtr->nButtonSize > lpRect->top))
 637             lpRect->bottom -= infoPtr->nButtonSize;
 638     }
 639
 640     TRACE("nPos=%d, nHeight=%d, window=%s\n", infoPtr->nPos, infoPtr->nHeight, wine_dbgstr_rect(&rcWindow));
 641     TRACE("[%p] client rect set to %s BtnState[%d,%d]\n", infoPtr->hwndSelf, wine_dbgstr_rect(lpRect),
 642           infoPtr->TLbtnState, infoPtr->BRbtnState);
 643
 644     return 0;
 645 }
 646
 647 static LRESULT
 648 PAGER_NCPaint (const PAGER_INFO* infoPtr, HRGN hRgn)
 649 {
 650     RECT rcBottomRight, rcTopLeft;
 651     HDC hdc;
 652
 653     if (infoPtr->dwStyle & WS_MINIMIZE)
 654         return 0;
 655
 656     DefWindowProcW (infoPtr->hwndSelf, WM_NCPAINT, (WPARAM)hRgn, 0);
 657
 658     if (!(hdc = GetDCEx (infoPtr->hwndSelf, 0, DCX_USESTYLE | DCX_WINDOW)))
 659         return 0;
 660
 661     PAGER_GetButtonRects(infoPtr, &rcTopLeft, &rcBottomRight, FALSE);
 662
 663     PAGER_DrawButton(hdc, infoPtr->clrBk, rcTopLeft,
 664                      infoPtr->dwStyle & PGS_HORZ, TRUE, infoPtr->TLbtnState);
 665     PAGER_DrawButton(hdc, infoPtr->clrBk, rcBottomRight,
 666                      infoPtr->dwStyle & PGS_HORZ, FALSE, infoPtr->BRbtnState);
 667
 668     ReleaseDC( infoPtr->hwndSelf, hdc );
 669     return 0;
 670 }
 671
 672 static INT
 673 PAGER_HitTest (const PAGER_INFO* infoPtr, const POINT * pt)
 674 {
 675     RECT clientRect, rcTopLeft, rcBottomRight;
 676     POINT ptWindow;
 677
 678     GetClientRect (infoPtr->hwndSelf, &clientRect);
 679
 680     if (PtInRect(&clientRect, *pt))
 681     {
 682         TRACE("child\n");
 683         return -1;
 684     }
 685
 686     ptWindow = *pt;
 687     PAGER_GetButtonRects(infoPtr, &rcTopLeft, &rcBottomRight, TRUE);
 688
 689     if ((infoPtr->TLbtnState != PGF_INVISIBLE) && PtInRect(&rcTopLeft, ptWindow))
 690     {
 691         TRACE("PGB_TOPORLEFT\n");
 692         return PGB_TOPORLEFT;
 693     }
 694     else if ((infoPtr->BRbtnState != PGF_INVISIBLE) && PtInRect(&rcBottomRight, ptWindow))
 695     {
 696         TRACE("PGB_BOTTOMORRIGHT\n");
 697         return PGB_BOTTOMORRIGHT;
 698     }
 699
 700     TRACE("nowhere\n");
 701     return -1;
 702 }
 703
 704 static LRESULT
 705 PAGER_NCHitTest (const PAGER_INFO* infoPtr, INT x, INT y)
 706 {
 707     POINT pt;
 708     INT nHit;
 709
 710     pt.x = x;
 711     pt.y = y;
 712
 713     ScreenToClient (infoPtr->hwndSelf, &pt);
 714     nHit = PAGER_HitTest(infoPtr, &pt);
 715
 716     return (nHit < 0) ? HTTRANSPARENT : HTCLIENT;
 717 }
 718
 719 static LRESULT
 720 PAGER_MouseMove (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 721 {
 722     POINT clpt, pt;
 723     RECT wnrect;
 724     BOOL topLeft = FALSE;
 725     INT btnstate = 0;
 726     INT hit;
 727     HDC hdc;
 728
 729     pt.x = x;
 730     pt.y = y;
 731
 732     TRACE("[%p] to (%d,%d)\n", infoPtr->hwndSelf, x, y);
 733     ClientToScreen(infoPtr->hwndSelf, &pt);
 734     GetWindowRect(infoPtr->hwndSelf, &wnrect);
 735     if (PtInRect(&wnrect, pt)) {
 736         RECT topleft, bottomright, *rect = NULL;
 737
 738         PAGER_GetButtonRects(infoPtr, &topleft, &bottomright, FALSE);
 739
 740         clpt = pt;
 741         MapWindowPoints(0, infoPtr->hwndSelf, &clpt, 1);
 742         hit = PAGER_HitTest(infoPtr, &clpt);
 743         if ((hit == PGB_TOPORLEFT) && (infoPtr->TLbtnState == PGF_NORMAL))
 744         {
 745             topLeft = TRUE;
 746             rect = &topleft;
 747             infoPtr->TLbtnState = PGF_HOT;
 748             btnstate = infoPtr->TLbtnState;
 749         }
 750         else if ((hit == PGB_BOTTOMORRIGHT) && (infoPtr->BRbtnState == PGF_NORMAL))
 751         {
 752             topLeft = FALSE;
 753             rect = &bottomright;
 754             infoPtr->BRbtnState = PGF_HOT;
 755             btnstate = infoPtr->BRbtnState;
 756         }
 757
 758         /* If in one of the buttons the capture and draw buttons */
 759         if (rect)
 760         {
 761             TRACE("[%p] draw btn (%s), Capture %s, style %08x\n",
 762                   infoPtr->hwndSelf, wine_dbgstr_rect(rect),
 763                   (infoPtr->bCapture) ? "TRUE" : "FALSE",
 764                   infoPtr->dwStyle);
 765             if (!infoPtr->bCapture)
 766             {
 767                 TRACE("[%p] SetCapture\n", infoPtr->hwndSelf);
 768                 SetCapture(infoPtr->hwndSelf);
 769                 infoPtr->bCapture = TRUE;
 770             }
 771             if (infoPtr->dwStyle & PGS_AUTOSCROLL)
 772                 SetTimer(infoPtr->hwndSelf, TIMERID1, 0x3e, 0);
 773             hdc = GetWindowDC(infoPtr->hwndSelf);
 774             /* OffsetRect(wnrect, 0 | 1, 0 | 1) */
 775             PAGER_DrawButton(hdc, infoPtr->clrBk, *rect,
 776                              infoPtr->dwStyle & PGS_HORZ, topLeft, btnstate);
 777             ReleaseDC(infoPtr->hwndSelf, hdc);
 778             return 0;
 779         }
 780     }
 781
 782     /* If we think we are captured, then do release */
 783     if (infoPtr->bCapture && (WindowFromPoint(pt) != infoPtr->hwndSelf))
 784     {
 785         NMHDR nmhdr;
 786
 787         infoPtr->bCapture = FALSE;
 788
 789         if (GetCapture() == infoPtr->hwndSelf)
 790         {
 791             ReleaseCapture();
 792
 793             if (infoPtr->TLbtnState == PGF_GRAYED)
 794             {
 795                 infoPtr->TLbtnState = PGF_INVISIBLE;
 796                 SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 797                              SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 798                              SWP_NOZORDER | SWP_NOACTIVATE);
 799             }
 800             else if (infoPtr->TLbtnState == PGF_HOT)
 801             {
 802                 infoPtr->TLbtnState = PGF_NORMAL;
 803                 /* FIXME: just invalidate button rect */
 804                 RedrawWindow(infoPtr->hwndSelf, NULL, NULL, RDW_FRAME | RDW_INVALIDATE);
 805             }
 806
 807             if (infoPtr->BRbtnState == PGF_GRAYED)
 808             {
 809                 infoPtr->BRbtnState = PGF_INVISIBLE;
 810                 SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 811                              SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 812                              SWP_NOZORDER | SWP_NOACTIVATE);
 813             }
 814             else if (infoPtr->BRbtnState == PGF_HOT)
 815             {
 816                 infoPtr->BRbtnState = PGF_NORMAL;
 817                 /* FIXME: just invalidate button rect */
 818                 RedrawWindow(infoPtr->hwndSelf, NULL, NULL, RDW_FRAME | RDW_INVALIDATE);
 819             }
 820
 821             /* Notify parent of released mouse capture */
 822                 memset(&nmhdr, 0, sizeof(NMHDR));
 823                 nmhdr.hwndFrom = infoPtr->hwndSelf;
 824                 nmhdr.idFrom   = GetWindowLongPtrW(infoPtr->hwndSelf, GWLP_ID);
 825                 nmhdr.code = NM_RELEASEDCAPTURE;
 826                 SendMessageW(infoPtr->hwndNotify, WM_NOTIFY, nmhdr.idFrom, (LPARAM)&nmhdr);
 827         }
 828         if (IsWindow(infoPtr->hwndSelf))
 829             KillTimer(infoPtr->hwndSelf, TIMERID1);
 830     }
 831     return 0;
 832 }
 833
 834 static LRESULT
 835 PAGER_LButtonDown (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 836 {
 837     BOOL repaintBtns = FALSE;
 838     POINT pt;
 839     INT hit;
 840
 841     pt.x = x;
 842     pt.y = y;
 843
 844     TRACE("[%p] at (%d,%d)\n", infoPtr->hwndSelf, x, y);
 845
 846     hit = PAGER_HitTest(infoPtr, &pt);
 847
 848     /* put btn in DEPRESSED state */
 849     if (hit == PGB_TOPORLEFT)
 850     {
 851         repaintBtns = infoPtr->TLbtnState != PGF_DEPRESSED;
 852         infoPtr->TLbtnState = PGF_DEPRESSED;
 853         SetTimer(infoPtr->hwndSelf, TIMERID1, INITIAL_DELAY, 0);
 854     }
 855     else if (hit == PGB_BOTTOMORRIGHT)
 856     {
 857         repaintBtns = infoPtr->BRbtnState != PGF_DEPRESSED;
 858         infoPtr->BRbtnState = PGF_DEPRESSED;
 859         SetTimer(infoPtr->hwndSelf, TIMERID1, INITIAL_DELAY, 0);
 860     }
 861
 862     if (repaintBtns)
 863         SendMessageW(infoPtr->hwndSelf, WM_NCPAINT, 0, 0);
 864
 865     switch(hit)
 866     {
 867     case PGB_TOPORLEFT:
 868         if (infoPtr->dwStyle & PGS_HORZ)
 869         {
 870             TRACE("[%p] PGF_SCROLLLEFT\n", infoPtr->hwndSelf);
 871             PAGER_Scroll(infoPtr, PGF_SCROLLLEFT);
 872         }
 873         else
 874         {
 875             TRACE("[%p] PGF_SCROLLUP\n", infoPtr->hwndSelf);
 876             PAGER_Scroll(infoPtr, PGF_SCROLLUP);
 877         }
 878         break;
 879     case PGB_BOTTOMORRIGHT:
 880         if (infoPtr->dwStyle & PGS_HORZ)
 881         {
 882             TRACE("[%p] PGF_SCROLLRIGHT\n", infoPtr->hwndSelf);
 883             PAGER_Scroll(infoPtr, PGF_SCROLLRIGHT);
 884         }
 885         else
 886         {
 887             TRACE("[%p] PGF_SCROLLDOWN\n", infoPtr->hwndSelf);
 888             PAGER_Scroll(infoPtr, PGF_SCROLLDOWN);
 889         }
 890         break;
 891     default:
 892         break;
 893     }
 894
 895     return 0;
 896 }
 897
 898 static LRESULT
 899 PAGER_LButtonUp (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 900 {
 901     TRACE("[%p]\n", infoPtr->hwndSelf);
 902
 903     KillTimer (infoPtr->hwndSelf, TIMERID1);
 904     KillTimer (infoPtr->hwndSelf, TIMERID2);
 905
 906     /* make PRESSED btns NORMAL but don't hide gray btns */
 907     if (infoPtr->TLbtnState & (PGF_HOT | PGF_DEPRESSED))
 908         infoPtr->TLbtnState = PGF_NORMAL;
 909     if (infoPtr->BRbtnState & (PGF_HOT | PGF_DEPRESSED))
 910         infoPtr->BRbtnState = PGF_NORMAL;
 911
 912     return 0;
 913 }
 914
 915 static LRESULT
 916 PAGER_Timer (PAGER_INFO* infoPtr, INT nTimerId)
 917 {
 918     INT dir;
 919
 920     /* if initial timer, kill it and start the repeat timer */
 921     if (nTimerId == TIMERID1) {
 922         if (infoPtr->TLbtnState == PGF_HOT)
 923             dir = (infoPtr->dwStyle & PGS_HORZ) ?
 924                 PGF_SCROLLLEFT : PGF_SCROLLUP;
 925         else
 926             dir = (infoPtr->dwStyle & PGS_HORZ) ?
 927                 PGF_SCROLLRIGHT : PGF_SCROLLDOWN;
 928         TRACE("[%p] TIMERID1: style=%08x, dir=%d\n",
 929               infoPtr->hwndSelf, infoPtr->dwStyle, dir);
 930         KillTimer(infoPtr->hwndSelf, TIMERID1);
 931         SetTimer(infoPtr->hwndSelf, TIMERID1, REPEAT_DELAY, 0);
 932         if (infoPtr->dwStyle & PGS_AUTOSCROLL) {
 933             PAGER_Scroll(infoPtr, dir);
 934             SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 935                          SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 936                          SWP_NOZORDER | SWP_NOACTIVATE);
 937         }
 938         return 0;
 939
 940     }
 941
 942     TRACE("[%p] TIMERID2: dir=%d\n", infoPtr->hwndSelf, infoPtr->direction);
 943     KillTimer(infoPtr->hwndSelf, TIMERID2);
 944     if (infoPtr->direction > 0) {
 945         PAGER_Scroll(infoPtr, infoPtr->direction);
 946         SetTimer(infoPtr->hwndSelf, TIMERID2, REPEAT_DELAY, 0);
 947     }
 948     return 0;
 949 }
 950
 951 static LRESULT
 952 PAGER_EraseBackground (const PAGER_INFO* infoPtr, HDC hdc)
 953 {
 954     POINT pt, ptorig;
 955     HWND parent;
 956     LRESULT ret;
 957
 958     pt.x = 0;
 959     pt.y = 0;
 960     parent = GetParent(infoPtr->hwndSelf);
 961     MapWindowPoints(infoPtr->hwndSelf, parent, &pt, 1);
 962     OffsetWindowOrgEx (hdc, pt.x, pt.y, &ptorig);
 963     ret = SendMessageW (parent, WM_ERASEBKGND, (WPARAM)hdc, 0);
 964     SetWindowOrgEx (hdc, ptorig.x, ptorig.y, 0);
 965
 966     return ret;
 967 }
 968
 969
 970 static LRESULT
 971 PAGER_Size (PAGER_INFO* infoPtr, INT type, INT x, INT y)
 972 {
 973     /* note that WM_SIZE is sent whenever NCCalcSize resizes the client wnd */
 974
 975     TRACE("[%p] %d,%d\n", infoPtr->hwndSelf, x, y);
 976
 977     if (infoPtr->dwStyle & PGS_HORZ)
 978         infoPtr->nHeight = y;
 979     else
 980         infoPtr->nWidth = x;
 981
 982     return PAGER_RecalcSize(infoPtr);
 983 }
 984
 985
 986 static LRESULT
 987 PAGER_StyleChanged(PAGER_INFO *infoPtr, WPARAM wStyleType, const STYLESTRUCT *lpss)
 988 {
 989     DWORD oldStyle = infoPtr->dwStyle;
 990
 991     TRACE("(styletype=%lx, styleOld=0x%08x, styleNew=0x%08x)\n",
 992           wStyleType, lpss->styleOld, lpss->styleNew);
 993
 994     if (wStyleType != GWL_STYLE) return 0;
 995
 996     infoPtr->dwStyle = lpss->styleNew;
 997
 998     if ((oldStyle ^ lpss->styleNew) & (PGS_HORZ | PGS_VERT))
 999     {
1000         PAGER_RecalcSize(infoPtr);
1001     }
1002
1003     return 0;
1004 }
1005
1006 static LRESULT WINAPI
1007 PAGER_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
1008 {
1009     PAGER_INFO *infoPtr = (PAGER_INFO *)GetWindowLongPtrW(hwnd, 0);
1010
1011     TRACE("(%p, %#x, %#lx, %#lx)\n", hwnd, uMsg, wParam, lParam);
1012
1013     if (!infoPtr && (uMsg != WM_CREATE))
1014         return DefWindowProcW (hwnd, uMsg, wParam, lParam);
1015
1016     switch (uMsg)
1017     {
1018         case EM_FMTLINES:
1019             return PAGER_FmtLines(infoPtr);
1020
1021         case PGM_FORWARDMOUSE:
1022             return PAGER_ForwardMouse (infoPtr, (BOOL)wParam);
1023
1024         case PGM_GETBKCOLOR:
1025             return PAGER_GetBkColor(infoPtr);
1026
1027         case PGM_GETBORDER:
1028             return PAGER_GetBorder(infoPtr);
1029
1030         case PGM_GETBUTTONSIZE:
1031             return PAGER_GetButtonSize(infoPtr);
1032
1033         case PGM_GETPOS:
1034             return PAGER_GetPos(infoPtr);
1035
1036         case PGM_GETBUTTONSTATE:
1037             return PAGER_GetButtonState (infoPtr, (INT)lParam);
1038
1039 /*      case PGM_GETDROPTARGET: */
1040
1041         case PGM_RECALCSIZE:
1042             return PAGER_RecalcSize(infoPtr);
1043
1044         case PGM_SETBKCOLOR:
1045             return PAGER_SetBkColor (infoPtr, (COLORREF)lParam);
1046
1047         case PGM_SETBORDER:
1048             return PAGER_SetBorder (infoPtr, (INT)lParam);
1049
1050         case PGM_SETBUTTONSIZE:
1051             return PAGER_SetButtonSize (infoPtr, (INT)lParam);
1052
1053         case PGM_SETCHILD:
1054             return PAGER_SetChild (infoPtr, (HWND)lParam);
1055
1056         case PGM_SETPOS:
1057             return PAGER_SetPos(infoPtr, (INT)lParam, FALSE);
1058
1059         case WM_CREATE:
1060             return PAGER_Create (hwnd, (LPCREATESTRUCTW)lParam);
1061
1062         case WM_DESTROY:
1063             return PAGER_Destroy (infoPtr);
1064
1065         case WM_SIZE:
1066             return PAGER_Size (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1067
1068         case WM_NCPAINT:
1069             return PAGER_NCPaint (infoPtr, (HRGN)wParam);
1070
1071         case WM_STYLECHANGED:
1072             return PAGER_StyleChanged(infoPtr, wParam, (LPSTYLESTRUCT)lParam);
1073
1074         case WM_NCCALCSIZE:
1075             return PAGER_NCCalcSize (infoPtr, wParam, (LPRECT)lParam);
1076
1077         case WM_NCHITTEST:
1078             return PAGER_NCHitTest (infoPtr, (short)LOWORD(lParam), (short)HIWORD(lParam));
1079
1080         case WM_MOUSEMOVE:
1081             if (infoPtr->bForward && infoPtr->hwndChild)
1082                 PostMessageW(infoPtr->hwndChild, WM_MOUSEMOVE, wParam, lParam);
1083             return PAGER_MouseMove (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1084
1085         case WM_LBUTTONDOWN:
1086             return PAGER_LButtonDown (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1087
1088         case WM_LBUTTONUP:
1089             return PAGER_LButtonUp (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1090
1091         case WM_ERASEBKGND:
1092             return PAGER_EraseBackground (infoPtr, (HDC)wParam);
1093
1094         case WM_TIMER:
1095             return PAGER_Timer (infoPtr, (INT)wParam);
1096
1097         case WM_NOTIFY:
1098         case WM_COMMAND:
1099             return SendMessageW (infoPtr->hwndNotify, uMsg, wParam, lParam);
1100
1101         default:
1102             return DefWindowProcW (hwnd, uMsg, wParam, lParam);
1103     }
1104 }
1105
1106
1107 VOID
1108 PAGER_Register (void)
1109 {
1110     WNDCLASSW wndClass;
1111
1112     ZeroMemory (&wndClass, sizeof(WNDCLASSW));
1113     wndClass.style         = CS_GLOBALCLASS;
1114     wndClass.lpfnWndProc   = PAGER_WindowProc;
1115     wndClass.cbClsExtra    = 0;
1116     wndClass.cbWndExtra    = sizeof(PAGER_INFO *);
1117     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1118     wndClass.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);
1119     wndClass.lpszClassName = WC_PAGESCROLLERW;
1120
1121     RegisterClassW (&wndClass);
1122 }
1123
1124
1125 VOID
1126 PAGER_Unregister (void)
1127 {
1128     UnregisterClassW (WC_PAGESCROLLERW, NULL);
1129 }