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 static LRESULT
 392 PAGER_WindowPosChanging(PAGER_INFO* infoPtr, WINDOWPOS *winpos)
 393 {
 394     if ((infoPtr->dwStyle & CCS_NORESIZE) && !(winpos->flags & SWP_NOSIZE))
 395     {
 396         /* don't let the app resize the nonscrollable dimension of a control
 397          * that was created with CCS_NORESIZE style
 398          * (i.e. height for a horizontal pager, or width for a vertical one) */
 399
 400         /* except if the current dimension is 0 and app is setting for
 401          * first time, then save amount as dimension. - GA 8/01 */
 402
 403         if (infoPtr->dwStyle & PGS_HORZ)
 404             if (!infoPtr->nHeight && winpos->cy)
 405                 infoPtr->nHeight = winpos->cy;
 406             else
 407                 winpos->cy = infoPtr->nHeight;
 408         else
 409             if (!infoPtr->nWidth && winpos->cx)
 410                 infoPtr->nWidth = winpos->cx;
 411             else
 412                 winpos->cx = infoPtr->nWidth;
 413         return 0;
 414     }
 415
 416     return DefWindowProcW (infoPtr->hwndSelf, WM_WINDOWPOSCHANGING, 0, (LPARAM)winpos);
 417 }
 418
 419 /******************************************************************
 420  * For the PGM_RECALCSIZE message (but not the other uses in      *
 421  * this module), the native control does only the following:      *
 422  *                                                                *
 423  *    if (some condition)                                         *
 424  *          PostMessageW(hwnd, EM_FMTLINES, 0, 0);                *
 425  *    return DefWindowProcW(hwnd, PGM_RECALCSIZE, 0, 0);          *
 426  *                                                                *
 427  * When we figure out what the "some condition" is we will        *
 428  * implement that for the message processing.                     *
 429  ******************************************************************/
 430
 431 static LRESULT
 432 PAGER_RecalcSize(PAGER_INFO *infoPtr)
 433 {
 434     TRACE("[%p]\n", infoPtr->hwndSelf);
 435
 436     if (infoPtr->hwndChild)
 437     {
 438         INT scrollRange = PAGER_GetScrollRange(infoPtr);
 439
 440         if (scrollRange <= 0)
 441         {
 442             infoPtr->nPos = -1;
 443             PAGER_SetPos(infoPtr, 0, FALSE);
 444         }
 445         else
 446             PAGER_PositionChildWnd(infoPtr);
 447     }
 448
 449     return 1;
 450 }
 451
 452
 453 static COLORREF
 454 PAGER_SetBkColor (PAGER_INFO* infoPtr, COLORREF clrBk)
 455 {
 456     COLORREF clrTemp = infoPtr->clrBk;
 457
 458     infoPtr->clrBk = clrBk;
 459     TRACE("[%p] %06x\n", infoPtr->hwndSelf, infoPtr->clrBk);
 460
 461     /* the native control seems to do things this way */
 462     SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 463                  SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 464                  SWP_NOZORDER | SWP_NOACTIVATE);
 465
 466     RedrawWindow(infoPtr->hwndSelf, 0, 0, RDW_ERASE | RDW_INVALIDATE);
 467
 468     return clrTemp;
 469 }
 470
 471
 472 static INT
 473 PAGER_SetBorder (PAGER_INFO* infoPtr, INT iBorder)
 474 {
 475     INT nTemp = infoPtr->nBorder;
 476
 477     infoPtr->nBorder = iBorder;
 478     TRACE("[%p] %d\n", infoPtr->hwndSelf, infoPtr->nBorder);
 479
 480     PAGER_RecalcSize(infoPtr);
 481
 482     return nTemp;
 483 }
 484
 485
 486 static INT
 487 PAGER_SetButtonSize (PAGER_INFO* infoPtr, INT iButtonSize)
 488 {
 489     INT nTemp = infoPtr->nButtonSize;
 490
 491     infoPtr->nButtonSize = iButtonSize;
 492     TRACE("[%p] %d\n", infoPtr->hwndSelf, infoPtr->nButtonSize);
 493
 494     PAGER_RecalcSize(infoPtr);
 495
 496     return nTemp;
 497 }
 498
 499
 500 static LRESULT
 501 PAGER_SetChild (PAGER_INFO* infoPtr, HWND hwndChild)
 502 {
 503     infoPtr->hwndChild = IsWindow (hwndChild) ? hwndChild : 0;
 504
 505     if (infoPtr->hwndChild)
 506     {
 507         TRACE("[%p] hwndChild=%p\n", infoPtr->hwndSelf, infoPtr->hwndChild);
 508
 509         SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 510                      SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE);
 511
 512         /* position child within the page scroller */
 513         SetWindowPos(infoPtr->hwndChild, HWND_TOP,
 514                      0,0,0,0,
 515                      SWP_SHOWWINDOW | SWP_NOSIZE);  /* native is 0 */
 516
 517         infoPtr->nPos = -1;
 518         PAGER_SetPos(infoPtr, 0, FALSE);
 519     }
 520
 521     return 0;
 522 }
 523
 524 static void
 525 PAGER_Scroll(PAGER_INFO* infoPtr, INT dir)
 526 {
 527     NMPGSCROLL nmpgScroll;
 528     RECT rcWnd;
 529
 530     if (infoPtr->hwndChild)
 531     {
 532         ZeroMemory (&nmpgScroll, sizeof (NMPGSCROLL));
 533         nmpgScroll.hdr.hwndFrom = infoPtr->hwndSelf;
 534         nmpgScroll.hdr.idFrom   = GetWindowLongPtrW (infoPtr->hwndSelf, GWLP_ID);
 535         nmpgScroll.hdr.code = PGN_SCROLL;
 536
 537         GetWindowRect(infoPtr->hwndSelf, &rcWnd);
 538         GetClientRect(infoPtr->hwndSelf, &nmpgScroll.rcParent);
 539         nmpgScroll.iXpos = nmpgScroll.iYpos = 0;
 540         nmpgScroll.iDir = dir;
 541
 542         if (infoPtr->dwStyle & PGS_HORZ)
 543         {
 544             nmpgScroll.iScroll = rcWnd.right - rcWnd.left;
 545             nmpgScroll.iXpos = infoPtr->nPos;
 546         }
 547         else
 548         {
 549             nmpgScroll.iScroll = rcWnd.bottom - rcWnd.top;
 550             nmpgScroll.iYpos = infoPtr->nPos;
 551         }
 552         nmpgScroll.iScroll -= 2*infoPtr->nButtonSize;
 553
 554         SendMessageW (infoPtr->hwndNotify, WM_NOTIFY, nmpgScroll.hdr.idFrom, (LPARAM)&nmpgScroll);
 555
 556         TRACE("[%p] PGN_SCROLL returns iScroll=%d\n", infoPtr->hwndSelf, nmpgScroll.iScroll);
 557
 558         if (nmpgScroll.iScroll > 0)
 559         {
 560             infoPtr->direction = dir;
 561
 562             if (dir == PGF_SCROLLLEFT || dir == PGF_SCROLLUP)
 563                 PAGER_SetPos(infoPtr, infoPtr->nPos - nmpgScroll.iScroll, TRUE);
 564             else
 565                 PAGER_SetPos(infoPtr, infoPtr->nPos + nmpgScroll.iScroll, TRUE);
 566         }
 567         else
 568             infoPtr->direction = -1;
 569     }
 570 }
 571
 572 static LRESULT
 573 PAGER_FmtLines(const PAGER_INFO *infoPtr)
 574 {
 575     /* initiate NCCalcSize to resize client wnd and get size */
 576     SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 577                  SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 578                  SWP_NOZORDER | SWP_NOACTIVATE);
 579
 580     SetWindowPos(infoPtr->hwndChild, 0,
 581                  0,0,infoPtr->nWidth,infoPtr->nHeight,
 582                  0);
 583
 584     return DefWindowProcW (infoPtr->hwndSelf, EM_FMTLINES, 0, 0);
 585 }
 586
 587 static LRESULT
 588 PAGER_Create (HWND hwnd, const CREATESTRUCTW *lpcs)
 589 {
 590     PAGER_INFO *infoPtr;
 591
 592     /* allocate memory for info structure */
 593     infoPtr = Alloc (sizeof(PAGER_INFO));
 594     if (!infoPtr) return -1;
 595     SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
 596
 597     /* set default settings */
 598     infoPtr->hwndSelf = hwnd;
 599     infoPtr->hwndChild = NULL;
 600     infoPtr->hwndNotify = lpcs->hwndParent;
 601     infoPtr->dwStyle = lpcs->style;
 602     infoPtr->clrBk = GetSysColor(COLOR_BTNFACE);
 603     infoPtr->nBorder = 0;
 604     infoPtr->nButtonSize = 12;
 605     infoPtr->nPos = 0;
 606     infoPtr->nWidth = 0;
 607     infoPtr->nHeight = 0;
 608     infoPtr->bForward = FALSE;
 609     infoPtr->bCapture = FALSE;
 610     infoPtr->TLbtnState = PGF_INVISIBLE;
 611     infoPtr->BRbtnState = PGF_INVISIBLE;
 612     infoPtr->direction = -1;
 613
 614     if (infoPtr->dwStyle & PGS_DRAGNDROP)
 615         FIXME("[%p] Drag and Drop style is not implemented yet.\n", infoPtr->hwndSelf);
 616
 617     return 0;
 618 }
 619
 620
 621 static LRESULT
 622 PAGER_Destroy (PAGER_INFO *infoPtr)
 623 {
 624     SetWindowLongPtrW (infoPtr->hwndSelf, 0, 0);
 625     Free (infoPtr);  /* free pager info data */
 626     return 0;
 627 }
 628
 629 static LRESULT
 630 PAGER_NCCalcSize(PAGER_INFO* infoPtr, WPARAM wParam, LPRECT lpRect)
 631 {
 632     RECT rcChild, rcWindow;
 633
 634     /*
 635      * lpRect points to a RECT struct.  On entry, the struct
 636      * contains the proposed wnd rectangle for the window.
 637      * On exit, the struct should contain the screen
 638      * coordinates of the corresponding window's client area.
 639      */
 640
 641     DefWindowProcW (infoPtr->hwndSelf, WM_NCCALCSIZE, wParam, (LPARAM)lpRect);
 642
 643     TRACE("orig rect=%s\n", wine_dbgstr_rect(lpRect));
 644
 645     GetWindowRect (infoPtr->hwndChild, &rcChild);
 646     MapWindowPoints (0, infoPtr->hwndSelf, (LPPOINT)&rcChild, 2); /* FIXME: RECT != 2 POINTS */
 647     GetWindowRect (infoPtr->hwndSelf, &rcWindow);
 648
 649     infoPtr->nWidth = lpRect->right - lpRect->left;
 650     infoPtr->nHeight = lpRect->bottom - lpRect->top;
 651     PAGER_CalcSize( infoPtr );
 652
 653     if (infoPtr->dwStyle & PGS_HORZ)
 654     {
 655         if (infoPtr->TLbtnState && (lpRect->left + infoPtr->nButtonSize < lpRect->right))
 656             lpRect->left += infoPtr->nButtonSize;
 657         if (infoPtr->BRbtnState && (lpRect->right - infoPtr->nButtonSize > lpRect->left))
 658             lpRect->right -= infoPtr->nButtonSize;
 659     }
 660     else
 661     {
 662         if (infoPtr->TLbtnState && (lpRect->top + infoPtr->nButtonSize < lpRect->bottom))
 663             lpRect->top += infoPtr->nButtonSize;
 664         if (infoPtr->BRbtnState && (lpRect->bottom - infoPtr->nButtonSize > lpRect->top))
 665             lpRect->bottom -= infoPtr->nButtonSize;
 666     }
 667
 668     TRACE("nPos=%d, nHeight=%d, window=%s\n", infoPtr->nPos, infoPtr->nHeight, wine_dbgstr_rect(&rcWindow));
 669     TRACE("[%p] client rect set to %s BtnState[%d,%d]\n", infoPtr->hwndSelf, wine_dbgstr_rect(lpRect),
 670           infoPtr->TLbtnState, infoPtr->BRbtnState);
 671
 672     return 0;
 673 }
 674
 675 static LRESULT
 676 PAGER_NCPaint (const PAGER_INFO* infoPtr, HRGN hRgn)
 677 {
 678     RECT rcBottomRight, rcTopLeft;
 679     HDC hdc;
 680
 681     if (infoPtr->dwStyle & WS_MINIMIZE)
 682         return 0;
 683
 684     DefWindowProcW (infoPtr->hwndSelf, WM_NCPAINT, (WPARAM)hRgn, 0);
 685
 686     if (!(hdc = GetDCEx (infoPtr->hwndSelf, 0, DCX_USESTYLE | DCX_WINDOW)))
 687         return 0;
 688
 689     PAGER_GetButtonRects(infoPtr, &rcTopLeft, &rcBottomRight, FALSE);
 690
 691     PAGER_DrawButton(hdc, infoPtr->clrBk, rcTopLeft,
 692                      infoPtr->dwStyle & PGS_HORZ, TRUE, infoPtr->TLbtnState);
 693     PAGER_DrawButton(hdc, infoPtr->clrBk, rcBottomRight,
 694                      infoPtr->dwStyle & PGS_HORZ, FALSE, infoPtr->BRbtnState);
 695
 696     ReleaseDC( infoPtr->hwndSelf, hdc );
 697     return 0;
 698 }
 699
 700 static INT
 701 PAGER_HitTest (const PAGER_INFO* infoPtr, const POINT * pt)
 702 {
 703     RECT clientRect, rcTopLeft, rcBottomRight;
 704     POINT ptWindow;
 705
 706     GetClientRect (infoPtr->hwndSelf, &clientRect);
 707
 708     if (PtInRect(&clientRect, *pt))
 709     {
 710         TRACE("child\n");
 711         return -1;
 712     }
 713
 714     ptWindow = *pt;
 715     PAGER_GetButtonRects(infoPtr, &rcTopLeft, &rcBottomRight, TRUE);
 716
 717     if ((infoPtr->TLbtnState != PGF_INVISIBLE) && PtInRect(&rcTopLeft, ptWindow))
 718     {
 719         TRACE("PGB_TOPORLEFT\n");
 720         return PGB_TOPORLEFT;
 721     }
 722     else if ((infoPtr->BRbtnState != PGF_INVISIBLE) && PtInRect(&rcBottomRight, ptWindow))
 723     {
 724         TRACE("PGB_BOTTOMORRIGHT\n");
 725         return PGB_BOTTOMORRIGHT;
 726     }
 727
 728     TRACE("nowhere\n");
 729     return -1;
 730 }
 731
 732 static LRESULT
 733 PAGER_NCHitTest (const PAGER_INFO* infoPtr, INT x, INT y)
 734 {
 735     POINT pt;
 736     INT nHit;
 737
 738     pt.x = x;
 739     pt.y = y;
 740
 741     ScreenToClient (infoPtr->hwndSelf, &pt);
 742     nHit = PAGER_HitTest(infoPtr, &pt);
 743
 744     return (nHit < 0) ? HTTRANSPARENT : HTCLIENT;
 745 }
 746
 747 static LRESULT
 748 PAGER_MouseMove (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 749 {
 750     POINT clpt, pt;
 751     RECT wnrect;
 752     BOOL topLeft = FALSE;
 753     INT btnstate = 0;
 754     INT hit;
 755     HDC hdc;
 756
 757     pt.x = x;
 758     pt.y = y;
 759
 760     TRACE("[%p] to (%d,%d)\n", infoPtr->hwndSelf, x, y);
 761     ClientToScreen(infoPtr->hwndSelf, &pt);
 762     GetWindowRect(infoPtr->hwndSelf, &wnrect);
 763     if (PtInRect(&wnrect, pt)) {
 764         RECT topleft, bottomright, *rect = NULL;
 765
 766         PAGER_GetButtonRects(infoPtr, &topleft, &bottomright, FALSE);
 767
 768         clpt = pt;
 769         MapWindowPoints(0, infoPtr->hwndSelf, &clpt, 1);
 770         hit = PAGER_HitTest(infoPtr, &clpt);
 771         if ((hit == PGB_TOPORLEFT) && (infoPtr->TLbtnState == PGF_NORMAL))
 772         {
 773             topLeft = TRUE;
 774             rect = &topleft;
 775             infoPtr->TLbtnState = PGF_HOT;
 776             btnstate = infoPtr->TLbtnState;
 777         }
 778         else if ((hit == PGB_BOTTOMORRIGHT) && (infoPtr->BRbtnState == PGF_NORMAL))
 779         {
 780             topLeft = FALSE;
 781             rect = &bottomright;
 782             infoPtr->BRbtnState = PGF_HOT;
 783             btnstate = infoPtr->BRbtnState;
 784         }
 785
 786         /* If in one of the buttons the capture and draw buttons */
 787         if (rect)
 788         {
 789             TRACE("[%p] draw btn (%s), Capture %s, style %08x\n",
 790                   infoPtr->hwndSelf, wine_dbgstr_rect(rect),
 791                   (infoPtr->bCapture) ? "TRUE" : "FALSE",
 792                   infoPtr->dwStyle);
 793             if (!infoPtr->bCapture)
 794             {
 795                 TRACE("[%p] SetCapture\n", infoPtr->hwndSelf);
 796                 SetCapture(infoPtr->hwndSelf);
 797                 infoPtr->bCapture = TRUE;
 798             }
 799             if (infoPtr->dwStyle & PGS_AUTOSCROLL)
 800                 SetTimer(infoPtr->hwndSelf, TIMERID1, 0x3e, 0);
 801             hdc = GetWindowDC(infoPtr->hwndSelf);
 802             /* OffsetRect(wnrect, 0 | 1, 0 | 1) */
 803             PAGER_DrawButton(hdc, infoPtr->clrBk, *rect,
 804                              infoPtr->dwStyle & PGS_HORZ, topLeft, btnstate);
 805             ReleaseDC(infoPtr->hwndSelf, hdc);
 806             return 0;
 807         }
 808     }
 809
 810     /* If we think we are captured, then do release */
 811     if (infoPtr->bCapture && (WindowFromPoint(pt) != infoPtr->hwndSelf))
 812     {
 813         NMHDR nmhdr;
 814
 815         infoPtr->bCapture = FALSE;
 816
 817         if (GetCapture() == infoPtr->hwndSelf)
 818         {
 819             ReleaseCapture();
 820
 821             if (infoPtr->TLbtnState == PGF_GRAYED)
 822             {
 823                 infoPtr->TLbtnState = PGF_INVISIBLE;
 824                 SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 825                              SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 826                              SWP_NOZORDER | SWP_NOACTIVATE);
 827             }
 828             else if (infoPtr->TLbtnState == PGF_HOT)
 829             {
 830                 infoPtr->TLbtnState = PGF_NORMAL;
 831                 /* FIXME: just invalidate button rect */
 832                 RedrawWindow(infoPtr->hwndSelf, NULL, NULL, RDW_FRAME | RDW_INVALIDATE);
 833             }
 834
 835             if (infoPtr->BRbtnState == PGF_GRAYED)
 836             {
 837                 infoPtr->BRbtnState = PGF_INVISIBLE;
 838                 SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 839                              SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 840                              SWP_NOZORDER | SWP_NOACTIVATE);
 841             }
 842             else if (infoPtr->BRbtnState == PGF_HOT)
 843             {
 844                 infoPtr->BRbtnState = PGF_NORMAL;
 845                 /* FIXME: just invalidate button rect */
 846                 RedrawWindow(infoPtr->hwndSelf, NULL, NULL, RDW_FRAME | RDW_INVALIDATE);
 847             }
 848
 849             /* Notify parent of released mouse capture */
 850                 memset(&nmhdr, 0, sizeof(NMHDR));
 851                 nmhdr.hwndFrom = infoPtr->hwndSelf;
 852                 nmhdr.idFrom   = GetWindowLongPtrW(infoPtr->hwndSelf, GWLP_ID);
 853                 nmhdr.code = NM_RELEASEDCAPTURE;
 854                 SendMessageW(infoPtr->hwndNotify, WM_NOTIFY, nmhdr.idFrom, (LPARAM)&nmhdr);
 855         }
 856         if (IsWindow(infoPtr->hwndSelf))
 857             KillTimer(infoPtr->hwndSelf, TIMERID1);
 858     }
 859     return 0;
 860 }
 861
 862 static LRESULT
 863 PAGER_LButtonDown (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 864 {
 865     BOOL repaintBtns = FALSE;
 866     POINT pt;
 867     INT hit;
 868
 869     pt.x = x;
 870     pt.y = y;
 871
 872     TRACE("[%p] at (%d,%d)\n", infoPtr->hwndSelf, x, y);
 873
 874     hit = PAGER_HitTest(infoPtr, &pt);
 875
 876     /* put btn in DEPRESSED state */
 877     if (hit == PGB_TOPORLEFT)
 878     {
 879         repaintBtns = infoPtr->TLbtnState != PGF_DEPRESSED;
 880         infoPtr->TLbtnState = PGF_DEPRESSED;
 881         SetTimer(infoPtr->hwndSelf, TIMERID1, INITIAL_DELAY, 0);
 882     }
 883     else if (hit == PGB_BOTTOMORRIGHT)
 884     {
 885         repaintBtns = infoPtr->BRbtnState != PGF_DEPRESSED;
 886         infoPtr->BRbtnState = PGF_DEPRESSED;
 887         SetTimer(infoPtr->hwndSelf, TIMERID1, INITIAL_DELAY, 0);
 888     }
 889
 890     if (repaintBtns)
 891         SendMessageW(infoPtr->hwndSelf, WM_NCPAINT, 0, 0);
 892
 893     switch(hit)
 894     {
 895     case PGB_TOPORLEFT:
 896         if (infoPtr->dwStyle & PGS_HORZ)
 897         {
 898             TRACE("[%p] PGF_SCROLLLEFT\n", infoPtr->hwndSelf);
 899             PAGER_Scroll(infoPtr, PGF_SCROLLLEFT);
 900         }
 901         else
 902         {
 903             TRACE("[%p] PGF_SCROLLUP\n", infoPtr->hwndSelf);
 904             PAGER_Scroll(infoPtr, PGF_SCROLLUP);
 905         }
 906         break;
 907     case PGB_BOTTOMORRIGHT:
 908         if (infoPtr->dwStyle & PGS_HORZ)
 909         {
 910             TRACE("[%p] PGF_SCROLLRIGHT\n", infoPtr->hwndSelf);
 911             PAGER_Scroll(infoPtr, PGF_SCROLLRIGHT);
 912         }
 913         else
 914         {
 915             TRACE("[%p] PGF_SCROLLDOWN\n", infoPtr->hwndSelf);
 916             PAGER_Scroll(infoPtr, PGF_SCROLLDOWN);
 917         }
 918         break;
 919     default:
 920         break;
 921     }
 922
 923     return 0;
 924 }
 925
 926 static LRESULT
 927 PAGER_LButtonUp (PAGER_INFO* infoPtr, INT keys, INT x, INT y)
 928 {
 929     TRACE("[%p]\n", infoPtr->hwndSelf);
 930
 931     KillTimer (infoPtr->hwndSelf, TIMERID1);
 932     KillTimer (infoPtr->hwndSelf, TIMERID2);
 933
 934     /* make PRESSED btns NORMAL but don't hide gray btns */
 935     if (infoPtr->TLbtnState & (PGF_HOT | PGF_DEPRESSED))
 936         infoPtr->TLbtnState = PGF_NORMAL;
 937     if (infoPtr->BRbtnState & (PGF_HOT | PGF_DEPRESSED))
 938         infoPtr->BRbtnState = PGF_NORMAL;
 939
 940     return 0;
 941 }
 942
 943 static LRESULT
 944 PAGER_Timer (PAGER_INFO* infoPtr, INT nTimerId)
 945 {
 946     INT dir;
 947
 948     /* if initial timer, kill it and start the repeat timer */
 949     if (nTimerId == TIMERID1) {
 950         if (infoPtr->TLbtnState == PGF_HOT)
 951             dir = (infoPtr->dwStyle & PGS_HORZ) ?
 952                 PGF_SCROLLLEFT : PGF_SCROLLUP;
 953         else
 954             dir = (infoPtr->dwStyle & PGS_HORZ) ?
 955                 PGF_SCROLLRIGHT : PGF_SCROLLDOWN;
 956         TRACE("[%p] TIMERID1: style=%08x, dir=%d\n",
 957               infoPtr->hwndSelf, infoPtr->dwStyle, dir);
 958         KillTimer(infoPtr->hwndSelf, TIMERID1);
 959         SetTimer(infoPtr->hwndSelf, TIMERID1, REPEAT_DELAY, 0);
 960         if (infoPtr->dwStyle & PGS_AUTOSCROLL) {
 961             PAGER_Scroll(infoPtr, dir);
 962             SetWindowPos(infoPtr->hwndSelf, 0, 0, 0, 0, 0,
 963                          SWP_FRAMECHANGED | SWP_NOSIZE | SWP_NOMOVE |
 964                          SWP_NOZORDER | SWP_NOACTIVATE);
 965         }
 966         return 0;
 967
 968     }
 969
 970     TRACE("[%p] TIMERID2: dir=%d\n", infoPtr->hwndSelf, infoPtr->direction);
 971     KillTimer(infoPtr->hwndSelf, TIMERID2);
 972     if (infoPtr->direction > 0) {
 973         PAGER_Scroll(infoPtr, infoPtr->direction);
 974         SetTimer(infoPtr->hwndSelf, TIMERID2, REPEAT_DELAY, 0);
 975     }
 976     return 0;
 977 }
 978
 979 static LRESULT
 980 PAGER_EraseBackground (const PAGER_INFO* infoPtr, HDC hdc)
 981 {
 982     POINT pt, ptorig;
 983     HWND parent;
 984     LRESULT ret;
 985
 986     pt.x = 0;
 987     pt.y = 0;
 988     parent = GetParent(infoPtr->hwndSelf);
 989     MapWindowPoints(infoPtr->hwndSelf, parent, &pt, 1);
 990     OffsetWindowOrgEx (hdc, pt.x, pt.y, &ptorig);
 991     ret = SendMessageW (parent, WM_ERASEBKGND, (WPARAM)hdc, 0);
 992     SetWindowOrgEx (hdc, ptorig.x, ptorig.y, 0);
 993
 994     return ret;
 995 }
 996
 997
 998 static LRESULT
 999 PAGER_Size (PAGER_INFO* infoPtr, INT type, INT x, INT y)
1000 {
1001     /* note that WM_SIZE is sent whenever NCCalcSize resizes the client wnd */
1002
1003     TRACE("[%p] %d,%d\n", infoPtr->hwndSelf, x, y);
1004
1005     if (infoPtr->dwStyle & PGS_HORZ)
1006         infoPtr->nHeight = y;
1007     else
1008         infoPtr->nWidth = x;
1009
1010     return PAGER_RecalcSize(infoPtr);
1011 }
1012
1013
1014 static LRESULT
1015 PAGER_StyleChanged(PAGER_INFO *infoPtr, WPARAM wStyleType, const STYLESTRUCT *lpss)
1016 {
1017     DWORD oldStyle = infoPtr->dwStyle;
1018
1019     TRACE("(styletype=%lx, styleOld=0x%08x, styleNew=0x%08x)\n",
1020           wStyleType, lpss->styleOld, lpss->styleNew);
1021
1022     if (wStyleType != GWL_STYLE) return 0;
1023
1024     infoPtr->dwStyle = lpss->styleNew;
1025
1026     if ((oldStyle ^ lpss->styleNew) & (PGS_HORZ | PGS_VERT))
1027     {
1028         PAGER_RecalcSize(infoPtr);
1029     }
1030
1031     return 0;
1032 }
1033
1034 static LRESULT WINAPI
1035 PAGER_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
1036 {
1037     PAGER_INFO *infoPtr = (PAGER_INFO *)GetWindowLongPtrW(hwnd, 0);
1038
1039     if (!infoPtr && (uMsg != WM_CREATE))
1040         return DefWindowProcW (hwnd, uMsg, wParam, lParam);
1041
1042     switch (uMsg)
1043     {
1044         case EM_FMTLINES:
1045             return PAGER_FmtLines(infoPtr);
1046
1047         case PGM_FORWARDMOUSE:
1048             return PAGER_ForwardMouse (infoPtr, (BOOL)wParam);
1049
1050         case PGM_GETBKCOLOR:
1051             return PAGER_GetBkColor(infoPtr);
1052
1053         case PGM_GETBORDER:
1054             return PAGER_GetBorder(infoPtr);
1055
1056         case PGM_GETBUTTONSIZE:
1057             return PAGER_GetButtonSize(infoPtr);
1058
1059         case PGM_GETPOS:
1060             return PAGER_GetPos(infoPtr);
1061
1062         case PGM_GETBUTTONSTATE:
1063             return PAGER_GetButtonState (infoPtr, (INT)lParam);
1064
1065 /*      case PGM_GETDROPTARGET: */
1066
1067         case PGM_RECALCSIZE:
1068             return PAGER_RecalcSize(infoPtr);
1069
1070         case PGM_SETBKCOLOR:
1071             return PAGER_SetBkColor (infoPtr, (COLORREF)lParam);
1072
1073         case PGM_SETBORDER:
1074             return PAGER_SetBorder (infoPtr, (INT)lParam);
1075
1076         case PGM_SETBUTTONSIZE:
1077             return PAGER_SetButtonSize (infoPtr, (INT)lParam);
1078
1079         case PGM_SETCHILD:
1080             return PAGER_SetChild (infoPtr, (HWND)lParam);
1081
1082         case PGM_SETPOS:
1083             return PAGER_SetPos(infoPtr, (INT)lParam, FALSE);
1084
1085         case WM_CREATE:
1086             return PAGER_Create (hwnd, (LPCREATESTRUCTW)lParam);
1087
1088         case WM_DESTROY:
1089             return PAGER_Destroy (infoPtr);
1090
1091         case WM_SIZE:
1092             return PAGER_Size (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1093
1094         case WM_NCPAINT:
1095             return PAGER_NCPaint (infoPtr, (HRGN)wParam);
1096
1097         case WM_WINDOWPOSCHANGING:
1098             return PAGER_WindowPosChanging (infoPtr, (WINDOWPOS*)lParam);
1099
1100         case WM_STYLECHANGED:
1101             return PAGER_StyleChanged(infoPtr, wParam, (LPSTYLESTRUCT)lParam);
1102
1103         case WM_NCCALCSIZE:
1104             return PAGER_NCCalcSize (infoPtr, wParam, (LPRECT)lParam);
1105
1106         case WM_NCHITTEST:
1107             return PAGER_NCHitTest (infoPtr, (short)LOWORD(lParam), (short)HIWORD(lParam));
1108
1109         case WM_MOUSEMOVE:
1110             if (infoPtr->bForward && infoPtr->hwndChild)
1111                 PostMessageW(infoPtr->hwndChild, WM_MOUSEMOVE, wParam, lParam);
1112             return PAGER_MouseMove (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1113
1114         case WM_LBUTTONDOWN:
1115             return PAGER_LButtonDown (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1116
1117         case WM_LBUTTONUP:
1118             return PAGER_LButtonUp (infoPtr, (INT)wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
1119
1120         case WM_ERASEBKGND:
1121             return PAGER_EraseBackground (infoPtr, (HDC)wParam);
1122
1123         case WM_TIMER:
1124             return PAGER_Timer (infoPtr, (INT)wParam);
1125
1126         case WM_NOTIFY:
1127         case WM_COMMAND:
1128             return SendMessageW (infoPtr->hwndNotify, uMsg, wParam, lParam);
1129
1130         default:
1131             return DefWindowProcW (hwnd, uMsg, wParam, lParam);
1132     }
1133 }
1134
1135
1136 VOID
1137 PAGER_Register (void)
1138 {
1139     WNDCLASSW wndClass;
1140
1141     ZeroMemory (&wndClass, sizeof(WNDCLASSW));
1142     wndClass.style         = CS_GLOBALCLASS;
1143     wndClass.lpfnWndProc   = PAGER_WindowProc;
1144     wndClass.cbClsExtra    = 0;
1145     wndClass.cbWndExtra    = sizeof(PAGER_INFO *);
1146     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1147     wndClass.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);
1148     wndClass.lpszClassName = WC_PAGESCROLLERW;
1149
1150     RegisterClassW (&wndClass);
1151 }
1152
1153
1154 VOID
1155 PAGER_Unregister (void)
1156 {
1157     UnregisterClassW (WC_PAGESCROLLERW, NULL);
1158 }