programs/regedit/hexedit.c

   1 /*
   2  * Hex Edit control
   3  *
   4  * Copyright 2005 Robert Shearman
   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  * TODO:
  21  * - Selection support
  22  * - Cut, copy and paste
  23  * - Mouse support
  24  */
  25
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <assert.h>
  30
  31 #include "windef.h"
  32 #include "winbase.h"
  33 #include "wingdi.h"
  34 #include "winuser.h"
  35 #include "winnls.h"
  36 #include "commctrl.h"
  37
  38 #include "main.h"
  39 #include "regproc.h"
  40
  41 /* spaces dividing hex and ASCII */
  42 #define DIV_SPACES 4
  43
  44 typedef struct tagHEXEDIT_INFO
  45 {
  46     HWND  hwndSelf;
  47     HFONT hFont;
  48     BOOL  bFocus : 1;
  49     BOOL  bFocusHex : 1; /* TRUE if focus is on hex, FALSE if focus on ASCII */
  50     BOOL  bInsert : 1; /* insert mode if TRUE, overwrite mode if FALSE */
  51     INT   nHeight; /* height of text */
  52     INT   nCaretPos; /* caret pos in nibbles */
  53     BYTE *pData;
  54     INT   cbData;
  55     INT   nBytesPerLine; /* bytes of hex to display per line of the control */
  56     INT   nScrollPos; /* first visible line */
  57 } HEXEDIT_INFO;
  58
  59 const WCHAR szHexEditClass[] = {'H','e','x','E','d','i','t',0};
  60
  61 static inline LRESULT HexEdit_SetFont (HEXEDIT_INFO *infoPtr, HFONT hFont, BOOL redraw);
  62
  63 static inline BYTE hexchar_to_byte(WCHAR ch)
  64 {
  65     if (ch >= '0' && ch <= '9')
  66         return ch - '0';
  67     else if (ch >= 'a' && ch <= 'f')
  68         return ch - 'a' + 10;
  69     else if (ch >= 'A' && ch <= 'F')
  70         return ch - 'A' + 10;
  71     else
  72         return -1;
  73 }
  74
  75 static LPWSTR HexEdit_GetLineText(BYTE *pData, LONG cbData, LONG pad)
  76 {
  77     static const WCHAR percent_02xW[] = {'%','0','2','X',' ',0};
  78
  79     WCHAR *lpszLine = heap_xalloc((cbData * 3 + pad * 3 + DIV_SPACES + cbData + 1) * sizeof(WCHAR));
  80     LONG i;
  81
  82     for (i = 0; i < cbData; i++)
  83         wsprintfW(lpszLine + i*3, percent_02xW, pData[i]);
  84     for (i = 0; i < pad * 3; i++)
  85         lpszLine[cbData * 3 + i] = ' ';
  86
  87     for (i = 0; i < DIV_SPACES; i++)
  88         lpszLine[cbData * 3 + pad * 3 + i] = ' ';
  89
  90     /* attempt an ASCII representation if the characters are printable,
  91      * otherwise display a '.' */
  92     for (i = 0; i < cbData; i++)
  93     {
  94         /* (C1_ALPHA|C1_BLANK|C1_PUNCT|C1_DIGIT|C1_LOWER|C1_UPPER) */
  95         if (isprint(pData[i]))
  96             lpszLine[cbData * 3 + pad * 3 + DIV_SPACES + i] = pData[i];
  97         else
  98             lpszLine[cbData * 3 + pad * 3 + DIV_SPACES + i] = '.';
  99     }
 100     lpszLine[cbData * 3 + pad * 3 + DIV_SPACES + cbData] = 0;
 101     return lpszLine;
 102 }
 103
 104 static void
 105 HexEdit_Paint(HEXEDIT_INFO *infoPtr)
 106 {
 107     PAINTSTRUCT ps;
 108     HDC hdc = BeginPaint(infoPtr->hwndSelf, &ps);
 109     INT nXStart, nYStart;
 110     COLORREF clrOldText;
 111     HFONT hOldFont;
 112     BYTE *pData;
 113     INT iMode;
 114     LONG lByteOffset = infoPtr->nScrollPos * infoPtr->nBytesPerLine;
 115
 116     /* Make a gap from the frame */
 117     nXStart = GetSystemMetrics(SM_CXBORDER);
 118     nYStart = GetSystemMetrics(SM_CYBORDER);
 119
 120     if (GetWindowLongW(infoPtr->hwndSelf, GWL_STYLE) & WS_DISABLED)
 121         clrOldText = SetTextColor(hdc, GetSysColor(COLOR_GRAYTEXT));
 122     else
 123         clrOldText = SetTextColor(hdc, GetSysColor(COLOR_WINDOWTEXT));
 124
 125     iMode = SetBkMode(hdc, TRANSPARENT);
 126     hOldFont = SelectObject(hdc, infoPtr->hFont);
 127
 128     for (pData = infoPtr->pData + lByteOffset; pData < infoPtr->pData + infoPtr->cbData; pData += infoPtr->nBytesPerLine)
 129     {
 130         LPWSTR lpszLine;
 131         LONG nLineLen = min((LONG)((infoPtr->pData + infoPtr->cbData) - pData),
 132             infoPtr->nBytesPerLine);
 133
 134         lpszLine = HexEdit_GetLineText(pData, nLineLen, infoPtr->nBytesPerLine - nLineLen);
 135
 136         /* FIXME: draw hex <-> ASCII mapping highlighted? */
 137         TextOutW(hdc, nXStart, nYStart, lpszLine, infoPtr->nBytesPerLine * 3 + DIV_SPACES + nLineLen);
 138
 139         nYStart += infoPtr->nHeight;
 140         heap_free(lpszLine);
 141     }
 142
 143     SelectObject(hdc, hOldFont);
 144     SetBkMode(hdc, iMode);
 145     SetTextColor(hdc, clrOldText);
 146
 147     EndPaint(infoPtr->hwndSelf, &ps);
 148 }
 149
 150 static void
 151 HexEdit_UpdateCaret(HEXEDIT_INFO *infoPtr)
 152 {
 153     HDC hdc;
 154     HFONT hOldFont;
 155     SIZE size;
 156     INT nCaretBytePos = infoPtr->nCaretPos/2;
 157     INT nByteLinePos = nCaretBytePos % infoPtr->nBytesPerLine;
 158     INT nLine = nCaretBytePos / infoPtr->nBytesPerLine;
 159     LONG nLineLen = min(infoPtr->cbData - nLine * infoPtr->nBytesPerLine, infoPtr->nBytesPerLine);
 160     LPWSTR lpszLine = HexEdit_GetLineText(infoPtr->pData + nLine * infoPtr->nBytesPerLine, nLineLen, infoPtr->nBytesPerLine - nLineLen);
 161     INT nCharOffset;
 162
 163     /* calculate offset of character caret is on in the line */
 164     if (infoPtr->bFocusHex)
 165         nCharOffset = nByteLinePos*3 + infoPtr->nCaretPos % 2;
 166     else
 167         nCharOffset = infoPtr->nBytesPerLine*3 + DIV_SPACES + nByteLinePos;
 168
 169     hdc = GetDC(infoPtr->hwndSelf);
 170     hOldFont = SelectObject(hdc, infoPtr->hFont);
 171
 172     GetTextExtentPoint32W(hdc, lpszLine, nCharOffset, &size);
 173
 174     SelectObject(hdc, hOldFont);
 175     ReleaseDC(infoPtr->hwndSelf, hdc);
 176
 177     if (!nLineLen) size.cx = 0;
 178
 179     heap_free(lpszLine);
 180
 181     SetCaretPos(
 182         GetSystemMetrics(SM_CXBORDER) + size.cx,
 183         GetSystemMetrics(SM_CYBORDER) + (nLine - infoPtr->nScrollPos) * infoPtr->nHeight);
 184 }
 185
 186 static void
 187 HexEdit_UpdateScrollbars(HEXEDIT_INFO *infoPtr)
 188 {
 189     RECT rcClient;
 190     INT nLines = infoPtr->cbData / infoPtr->nBytesPerLine;
 191     INT nVisibleLines;
 192     SCROLLINFO si;
 193
 194     GetClientRect(infoPtr->hwndSelf, &rcClient);
 195     InflateRect(&rcClient, -GetSystemMetrics(SM_CXBORDER), -GetSystemMetrics(SM_CYBORDER));
 196
 197     nVisibleLines = (rcClient.bottom - rcClient.top) / infoPtr->nHeight;
 198     si.cbSize = sizeof(si);
 199     si.fMask = SIF_RANGE | SIF_PAGE;
 200     si.nMin = 0;
 201     si.nMax = max(nLines - nVisibleLines, nLines);
 202     si.nPage = nVisibleLines;
 203     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, TRUE);
 204 }
 205
 206 static void
 207 HexEdit_EnsureVisible(HEXEDIT_INFO *infoPtr, INT nCaretPos)
 208 {
 209     INT nLine = nCaretPos / (2 * infoPtr->nBytesPerLine);
 210     SCROLLINFO si;
 211
 212     si.cbSize = sizeof(si);
 213     si.fMask  = SIF_POS | SIF_PAGE;
 214     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 215     if (nLine < si.nPos)
 216         si.nPos = nLine;
 217     else if (nLine >= si.nPos + si.nPage)
 218         si.nPos = nLine - si.nPage + 1;
 219     else
 220         return;
 221     si.fMask = SIF_POS;
 222
 223     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, FALSE);
 224     SendMessageW(infoPtr->hwndSelf, WM_VSCROLL, MAKELONG(SB_THUMBPOSITION, 0), 0);
 225 }
 226
 227
 228 static LRESULT
 229 HexEdit_SetData(HEXEDIT_INFO *infoPtr, INT cbData, const BYTE *pData)
 230 {
 231     heap_free(infoPtr->pData);
 232     infoPtr->cbData = 0;
 233
 234     infoPtr->pData = heap_xalloc(cbData);
 235     memcpy(infoPtr->pData, pData, cbData);
 236     infoPtr->cbData = cbData;
 237
 238     infoPtr->nCaretPos = 0;
 239     HexEdit_UpdateScrollbars(infoPtr);
 240     HexEdit_UpdateCaret(infoPtr);
 241     InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 242     return TRUE;
 243 }
 244
 245 static LRESULT
 246 HexEdit_GetData(HEXEDIT_INFO *infoPtr, INT cbData, BYTE *pData)
 247 {
 248     if (pData)
 249         memcpy(pData, infoPtr->pData, min(cbData, infoPtr->cbData));
 250     return infoPtr->cbData;
 251 }
 252
 253 static inline LRESULT
 254 HexEdit_Char (HEXEDIT_INFO *infoPtr, WCHAR ch)
 255 {
 256     INT nCaretBytePos = infoPtr->nCaretPos/2;
 257
 258     assert(nCaretBytePos >= 0);
 259
 260     /* backspace is special */
 261     if (ch == '\b')
 262     {
 263         if (infoPtr->nCaretPos == 0)
 264             return 0;
 265
 266         /* if at end of byte then delete the whole byte */
 267         if (infoPtr->bFocusHex && (infoPtr->nCaretPos % 2 == 0))
 268         {
 269             memmove(infoPtr->pData + nCaretBytePos - 1,
 270                     infoPtr->pData + nCaretBytePos,
 271                     infoPtr->cbData - nCaretBytePos);
 272             infoPtr->cbData--;
 273             infoPtr->nCaretPos -= 2; /* backtrack two nibble */
 274         }
 275         else /* blank upper nibble */
 276         {
 277             infoPtr->pData[nCaretBytePos] &= 0x0f;
 278             infoPtr->nCaretPos--; /* backtrack one nibble */
 279         }
 280     }
 281     else
 282     {
 283         if (infoPtr->bFocusHex && hexchar_to_byte(ch) == (BYTE)-1)
 284         {
 285             MessageBeep(MB_ICONWARNING);
 286             return 0;
 287         }
 288
 289         if ((infoPtr->bInsert && (infoPtr->nCaretPos % 2 == 0)) || (nCaretBytePos >= infoPtr->cbData))
 290         {
 291             /* make room for another byte */
 292             infoPtr->cbData++;
 293             infoPtr->pData = heap_xrealloc(infoPtr->pData, infoPtr->cbData + 1);
 294
 295             /* move everything after caret up one byte */
 296             memmove(infoPtr->pData + nCaretBytePos + 1,
 297                     infoPtr->pData + nCaretBytePos,
 298                     infoPtr->cbData - nCaretBytePos);
 299             /* zero new byte */
 300             infoPtr->pData[nCaretBytePos] = 0x0;
 301         }
 302
 303         /* overwrite a byte */
 304
 305         assert(nCaretBytePos < infoPtr->cbData);
 306
 307         if (infoPtr->bFocusHex)
 308         {
 309             BYTE orig_byte = infoPtr->pData[nCaretBytePos];
 310             BYTE digit = hexchar_to_byte(ch);
 311             if (infoPtr->nCaretPos % 2) /* set low nibble */
 312                 infoPtr->pData[nCaretBytePos] = (orig_byte & 0xf0) | digit;
 313             else /* set high nibble */
 314                 infoPtr->pData[nCaretBytePos] = (orig_byte & 0x0f) | digit << 4;
 315             infoPtr->nCaretPos++; /* advance one nibble */
 316         }
 317         else
 318         {
 319             infoPtr->pData[nCaretBytePos] = (BYTE)ch;
 320             infoPtr->nCaretPos += 2; /* advance two nibbles */
 321         }
 322     }
 323
 324     HexEdit_UpdateScrollbars(infoPtr);
 325     InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 326     HexEdit_UpdateCaret(infoPtr);
 327     HexEdit_EnsureVisible(infoPtr, infoPtr->nCaretPos);
 328     return 0;
 329 }
 330
 331 static inline LRESULT
 332 HexEdit_Create (HEXEDIT_INFO *infoPtr, LPCREATESTRUCTW lpcs)
 333 {
 334     HexEdit_SetFont(infoPtr, GetStockObject(SYSTEM_FONT), FALSE);
 335     HexEdit_UpdateScrollbars(infoPtr);
 336
 337     return 0;
 338 }
 339
 340
 341 static inline LRESULT
 342 HexEdit_Destroy (HEXEDIT_INFO *infoPtr)
 343 {
 344     HWND hwnd = infoPtr->hwndSelf;
 345     heap_free(infoPtr->pData);
 346     /* free info data */
 347     heap_free(infoPtr);
 348     SetWindowLongPtrW(hwnd, 0, 0);
 349     return 0;
 350 }
 351
 352
 353 static inline LRESULT
 354 HexEdit_EraseBackground (HEXEDIT_INFO *infoPtr, HDC hdc)
 355 {
 356     HBRUSH hBrush, hSolidBrush = NULL;
 357     RECT   rc;
 358
 359     if (GetWindowLongW(infoPtr->hwndSelf, GWL_STYLE) & WS_DISABLED)
 360         hBrush = hSolidBrush = CreateSolidBrush(GetSysColor(COLOR_BTNFACE));
 361     else
 362     {
 363         hBrush = (HBRUSH)SendMessageW(GetParent(infoPtr->hwndSelf), WM_CTLCOLOREDIT,
 364                                       (WPARAM)hdc, (LPARAM)infoPtr->hwndSelf);
 365         if (!hBrush)
 366             hBrush = hSolidBrush = CreateSolidBrush(GetSysColor(COLOR_WINDOW));
 367     }
 368
 369     GetClientRect (infoPtr->hwndSelf, &rc);
 370
 371     FillRect (hdc, &rc, hBrush);
 372
 373     if (hSolidBrush)
 374         DeleteObject(hSolidBrush);
 375
 376     return -1;
 377 }
 378
 379
 380 static inline LRESULT
 381 HexEdit_GetFont (HEXEDIT_INFO *infoPtr)
 382 {
 383     return (LRESULT)infoPtr->hFont;
 384 }
 385
 386 static inline LRESULT
 387 HexEdit_KeyDown (HEXEDIT_INFO *infoPtr, DWORD key, DWORD flags)
 388 {
 389     INT nInc = (infoPtr->bFocusHex) ? 1 : 2;
 390     SCROLLINFO si;
 391
 392     switch (key)
 393     {
 394     case VK_LEFT:
 395         infoPtr->nCaretPos -= nInc;
 396         if (infoPtr->nCaretPos < 0)
 397             infoPtr->nCaretPos = 0;
 398         break;
 399     case VK_RIGHT:
 400         infoPtr->nCaretPos += nInc;
 401         if (infoPtr->nCaretPos > infoPtr->cbData*2)
 402             infoPtr->nCaretPos = infoPtr->cbData*2;
 403         break;
 404     case VK_UP:
 405         if ((infoPtr->nCaretPos - infoPtr->nBytesPerLine*2) >= 0)
 406             infoPtr->nCaretPos -= infoPtr->nBytesPerLine*2;
 407         break;
 408     case VK_DOWN:
 409         if ((infoPtr->nCaretPos + infoPtr->nBytesPerLine*2) <= infoPtr->cbData*2)
 410             infoPtr->nCaretPos += infoPtr->nBytesPerLine*2;
 411         break;
 412     case VK_HOME:
 413         infoPtr->nCaretPos = 0;
 414         break;
 415     case VK_END:
 416         infoPtr->nCaretPos = infoPtr->cbData*2;
 417         break;
 418     case VK_PRIOR: /* page up */
 419         si.cbSize = sizeof(si);
 420         si.fMask = SIF_PAGE;
 421         GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 422         if ((infoPtr->nCaretPos - (INT)si.nPage*infoPtr->nBytesPerLine*2) >= 0)
 423             infoPtr->nCaretPos -= si.nPage*infoPtr->nBytesPerLine*2;
 424         else
 425             infoPtr->nCaretPos = 0;
 426         break;
 427     case VK_NEXT: /* page down */
 428         si.cbSize = sizeof(si);
 429         si.fMask = SIF_PAGE;
 430         GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 431         if ((infoPtr->nCaretPos + (INT)si.nPage*infoPtr->nBytesPerLine*2) <= infoPtr->cbData*2)
 432             infoPtr->nCaretPos += si.nPage*infoPtr->nBytesPerLine*2;
 433         else
 434             infoPtr->nCaretPos = infoPtr->cbData*2;
 435         break;
 436     default:
 437         return 0;
 438     }
 439
 440     HexEdit_UpdateCaret(infoPtr);
 441     HexEdit_EnsureVisible(infoPtr, infoPtr->nCaretPos);
 442
 443     return 0;
 444 }
 445
 446
 447 static inline LRESULT
 448 HexEdit_KillFocus (HEXEDIT_INFO *infoPtr, HWND receiveFocus)
 449 {
 450     infoPtr->bFocus = FALSE;
 451     DestroyCaret();
 452
 453     return 0;
 454 }
 455
 456
 457 static inline LRESULT
 458 HexEdit_LButtonDown (HEXEDIT_INFO *infoPtr)
 459 {
 460     SetFocus(infoPtr->hwndSelf);
 461
 462     /* FIXME: hittest and set caret */
 463
 464     return 0;
 465 }
 466
 467
 468 static inline LRESULT HexEdit_NCCreate (HWND hwnd, LPCREATESTRUCTW lpcs)
 469 {
 470     HEXEDIT_INFO *infoPtr;
 471     SetWindowLongW(hwnd, GWL_EXSTYLE,
 472                    lpcs->dwExStyle | WS_EX_CLIENTEDGE);
 473
 474     /* allocate memory for info structure */
 475     infoPtr = heap_xalloc(sizeof(HEXEDIT_INFO));
 476     memset(infoPtr, 0, sizeof(HEXEDIT_INFO));
 477     SetWindowLongPtrW(hwnd, 0, (DWORD_PTR)infoPtr);
 478
 479     /* initialize info structure */
 480     infoPtr->nCaretPos = 0;
 481     infoPtr->hwndSelf = hwnd;
 482     infoPtr->nBytesPerLine = 2;
 483     infoPtr->bFocusHex = TRUE;
 484     infoPtr->bInsert = TRUE;
 485
 486     return DefWindowProcW(infoPtr->hwndSelf, WM_NCCREATE, 0, (LPARAM)lpcs);
 487 }
 488
 489 static inline LRESULT
 490 HexEdit_SetFocus (HEXEDIT_INFO *infoPtr, HWND lostFocus)
 491 {
 492     infoPtr->bFocus = TRUE;
 493
 494     CreateCaret(infoPtr->hwndSelf, NULL, 1, infoPtr->nHeight);
 495     HexEdit_UpdateCaret(infoPtr);
 496     ShowCaret(infoPtr->hwndSelf);
 497
 498     return 0;
 499 }
 500
 501
 502 static inline LRESULT
 503 HexEdit_SetFont (HEXEDIT_INFO *infoPtr, HFONT hFont, BOOL redraw)
 504 {
 505     TEXTMETRICW tm;
 506     HDC hdc;
 507     HFONT hOldFont = NULL;
 508     LONG i;
 509     RECT rcClient;
 510
 511     infoPtr->hFont = hFont;
 512
 513     hdc = GetDC(infoPtr->hwndSelf);
 514     if (infoPtr->hFont)
 515         hOldFont = SelectObject(hdc, infoPtr->hFont);
 516
 517     GetTextMetricsW(hdc, &tm);
 518     infoPtr->nHeight = tm.tmHeight + tm.tmExternalLeading;
 519
 520     GetClientRect(infoPtr->hwndSelf, &rcClient);
 521
 522     for (i = 0; ; i++)
 523     {
 524         BYTE *pData = heap_xalloc(i);
 525         WCHAR *lpszLine;
 526         SIZE size;
 527
 528         memset(pData, 0, i);
 529         lpszLine = HexEdit_GetLineText(pData, i, 0);
 530         GetTextExtentPoint32W(hdc, lpszLine, lstrlenW(lpszLine), &size);
 531         heap_free(lpszLine);
 532         heap_free(pData);
 533         if (size.cx > (rcClient.right - rcClient.left))
 534         {
 535             infoPtr->nBytesPerLine = i - 1;
 536             break;
 537         }
 538     }
 539
 540     if (infoPtr->hFont)
 541         SelectObject(hdc, hOldFont);
 542     ReleaseDC (infoPtr->hwndSelf, hdc);
 543
 544     if (redraw)
 545         InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 546
 547     return 0;
 548 }
 549
 550 static inline LRESULT
 551 HexEdit_VScroll (HEXEDIT_INFO *infoPtr, INT action)
 552 {
 553     SCROLLINFO si;
 554
 555     /* get all scroll bar info */
 556     si.cbSize = sizeof(si);
 557     si.fMask  = SIF_ALL;
 558     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 559
 560     switch (LOWORD(action))
 561     {
 562     case SB_TOP: /* user pressed the home key */
 563         si.nPos = si.nMin;
 564         break;
 565
 566     case SB_BOTTOM: /* user pressed the end key */
 567         si.nPos = si.nMax;
 568         break;
 569
 570     case SB_LINEUP: /* user clicked the up arrow */
 571         si.nPos -= 1;
 572         break;
 573
 574     case SB_LINEDOWN: /* user clicked the down arrow */
 575         si.nPos += 1;
 576         break;
 577
 578     case SB_PAGEUP: /* user clicked the scroll bar above the scroll thumb */
 579         si.nPos -= si.nPage;
 580         break;
 581
 582     case SB_PAGEDOWN: /* user clicked the scroll bar below the scroll thumb */
 583         si.nPos += si.nPage;
 584         break;
 585
 586     case SB_THUMBTRACK: /* user dragged the scroll thumb */
 587         si.nPos = si.nTrackPos;
 588         break;
 589
 590     default:
 591         break;
 592     }
 593
 594     /* set the position and then retrieve it to let the system handle the
 595      * cases where the position is out of range */
 596     si.fMask = SIF_POS;
 597     SetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si, TRUE);
 598     GetScrollInfo(infoPtr->hwndSelf, SB_VERT, &si);
 599
 600     if (si.nPos != infoPtr->nScrollPos)
 601     {
 602         ScrollWindow(infoPtr->hwndSelf, 0, infoPtr->nHeight * (infoPtr->nScrollPos - si.nPos), NULL, NULL);
 603         infoPtr->nScrollPos = si.nPos;
 604         UpdateWindow(infoPtr->hwndSelf);
 605
 606         /* need to update caret position since it depends on the scroll position */
 607         HexEdit_UpdateCaret(infoPtr);
 608     }
 609     return 0;
 610 }
 611
 612
 613 static LRESULT WINAPI
 614 HexEdit_WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 615 {
 616     HEXEDIT_INFO *infoPtr = (HEXEDIT_INFO *)GetWindowLongPtrW(hwnd, 0);
 617
 618     if (!infoPtr && (uMsg != WM_NCCREATE))
 619         return DefWindowProcW(hwnd, uMsg, wParam, lParam);
 620
 621     switch (uMsg)
 622     {
 623         case HEM_SETDATA:
 624             return HexEdit_SetData (infoPtr, (INT)wParam, (const BYTE *)lParam);
 625
 626         case HEM_GETDATA:
 627             return HexEdit_GetData (infoPtr, (INT)wParam, (BYTE *)lParam);
 628
 629         case WM_CHAR:
 630             return HexEdit_Char (infoPtr, (WCHAR)wParam);
 631
 632         case WM_CREATE:
 633             return HexEdit_Create (infoPtr, (LPCREATESTRUCTW)lParam);
 634
 635         case WM_DESTROY:
 636             return HexEdit_Destroy (infoPtr);
 637
 638         case WM_ERASEBKGND:
 639             return HexEdit_EraseBackground (infoPtr, (HDC)wParam);
 640
 641         case WM_GETDLGCODE:
 642             return DLGC_WANTCHARS | DLGC_WANTARROWS;
 643
 644         case WM_GETFONT:
 645             return HexEdit_GetFont (infoPtr);
 646
 647         case WM_KEYDOWN:
 648             return HexEdit_KeyDown (infoPtr, wParam, lParam);
 649
 650         case WM_KILLFOCUS:
 651             return HexEdit_KillFocus (infoPtr, (HWND)wParam);
 652
 653         case WM_LBUTTONDOWN:
 654             return HexEdit_LButtonDown (infoPtr);
 655
 656         case WM_NCCREATE:
 657             return HexEdit_NCCreate (hwnd, (LPCREATESTRUCTW)lParam);
 658
 659         case WM_PAINT:
 660             HexEdit_Paint(infoPtr);
 661             return 0;
 662
 663         case WM_SETFOCUS:
 664             return HexEdit_SetFocus (infoPtr, (HWND)wParam);
 665
 666         case WM_SETFONT:
 667             return HexEdit_SetFont (infoPtr, (HFONT)wParam, LOWORD(lParam));
 668
 669         case WM_VSCROLL:
 670             return HexEdit_VScroll (infoPtr, (INT)wParam);
 671
 672         default:
 673             return DefWindowProcW(hwnd, uMsg, wParam, lParam);
 674     }
 675     return 0;
 676 }
 677
 678 void HexEdit_Register(void)
 679 {
 680     WNDCLASSW wndClass;
 681
 682     ZeroMemory(&wndClass, sizeof(WNDCLASSW));
 683     wndClass.style         = 0;
 684     wndClass.lpfnWndProc   = HexEdit_WindowProc;
 685     wndClass.cbClsExtra    = 0;
 686     wndClass.cbWndExtra    = sizeof(HEXEDIT_INFO *);
 687     wndClass.hCursor       = NULL;
 688     wndClass.hbrBackground = NULL;
 689     wndClass.lpszClassName = szHexEditClass;
 690
 691     RegisterClassW(&wndClass);
 692 }