dlls/shell32/autocomplete.c

   1 /*
   2  *      AutoComplete interfaces implementation.
   3  *
   4  *      Copyright 2004  Maxime Bellengé <maxime.bellenge@laposte.net>
   5  *      Copyright 2018  Gabriel Ivăncescu <gabrielopcode@gmail.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 /*
  23   TODO:
  24   - implement ACO_SEARCH style
  25   - implement ACO_RTLREADING style
  26   - implement ACO_WORD_FILTER style
  27  */
  28
  29 #include <stdarg.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #define COBJMACROS
  34
  35 #include "wine/debug.h"
  36 #include "windef.h"
  37 #include "winbase.h"
  38 #include "winreg.h"
  39 #include "shlwapi.h"
  40 #include "winerror.h"
  41 #include "objbase.h"
  42
  43 #include "pidl.h"
  44 #include "shlobj.h"
  45 #include "shldisp.h"
  46 #include "debughlp.h"
  47 #include "shell32_main.h"
  48
  49 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  50
  51 typedef struct
  52 {
  53     IAutoComplete2 IAutoComplete2_iface;
  54     IAutoCompleteDropDown IAutoCompleteDropDown_iface;
  55     LONG ref;
  56     BOOL initialized;
  57     BOOL enabled;
  58     UINT enum_strs_num;
  59     WCHAR **enum_strs;
  60     WCHAR **listbox_strs;
  61     HWND hwndEdit;
  62     HWND hwndListBox;
  63     HWND hwndListBoxOwner;
  64     WNDPROC wpOrigEditProc;
  65     WNDPROC wpOrigLBoxProc;
  66     WNDPROC wpOrigLBoxOwnerProc;
  67     WCHAR *txtbackup;
  68     WCHAR *quickComplete;
  69     IEnumString *enumstr;
  70     IACList *aclist;
  71     AUTOCOMPLETEOPTIONS options;
  72     WCHAR no_fwd_char;
  73 } IAutoCompleteImpl;
  74
  75 enum autoappend_flag
  76 {
  77     autoappend_flag_yes,
  78     autoappend_flag_no,
  79     autoappend_flag_displayempty
  80 };
  81
  82 enum prefix_filtering
  83 {
  84     prefix_filtering_none = 0,  /* no prefix filtering (raw search) */
  85     prefix_filtering_protocol,  /* filter common protocol (e.g. http://) */
  86     prefix_filtering_all        /* filter all common prefixes (protocol & www. ) */
  87 };
  88
  89 static const WCHAR autocomplete_propertyW[] = L"Wine Autocomplete control";
  90
  91 static inline IAutoCompleteImpl *impl_from_IAutoComplete2(IAutoComplete2 *iface)
  92 {
  93     return CONTAINING_RECORD(iface, IAutoCompleteImpl, IAutoComplete2_iface);
  94 }
  95
  96 static inline IAutoCompleteImpl *impl_from_IAutoCompleteDropDown(IAutoCompleteDropDown *iface)
  97 {
  98     return CONTAINING_RECORD(iface, IAutoCompleteImpl, IAutoCompleteDropDown_iface);
  99 }
 100
 101 static void set_text_and_selection(IAutoCompleteImpl *ac, HWND hwnd, WCHAR *text, WPARAM start, LPARAM end)
 102 {
 103     /* Send it directly to the edit control to match Windows behavior */
 104     WNDPROC proc = ac->wpOrigEditProc;
 105     if (CallWindowProcW(proc, hwnd, WM_SETTEXT, 0, (LPARAM)text))
 106         CallWindowProcW(proc, hwnd, EM_SETSEL, start, end);
 107 }
 108
 109 static inline WCHAR *filter_protocol(WCHAR *str)
 110 {
 111     if (!wcsncmp(str, L"http", 4))
 112     {
 113         str += 4;
 114         str += (*str == 's');    /* https */
 115         if (str[0] == ':' && str[1] == '/' && str[2] == '/')
 116             return str + 3;
 117     }
 118     return NULL;
 119 }
 120
 121 static inline WCHAR *filter_www(WCHAR *str)
 122 {
 123     if (!wcsncmp(str, L"www.", 4)) return str + 4;
 124     return NULL;
 125 }
 126
 127 /*
 128    Get the prefix filtering based on text, for example if text's prefix
 129    is a protocol, then we return none because we actually filter nothing
 130 */
 131 static enum prefix_filtering get_text_prefix_filtering(const WCHAR *text)
 132 {
 133     /* Convert to lowercase to perform case insensitive filtering,
 134        using the longest possible prefix as the size of the buffer */
 135     WCHAR buf[sizeof("https://")];
 136     UINT i;
 137
 138     for (i = 0; i < ARRAY_SIZE(buf) - 1 && text[i]; i++)
 139         buf[i] = towlower(text[i]);
 140     buf[i] = '\0';
 141
 142     if (filter_protocol(buf)) return prefix_filtering_none;
 143     if (filter_www(buf)) return prefix_filtering_protocol;
 144     return prefix_filtering_all;
 145 }
 146
 147 /*
 148    Filter the prefix of str based on the value of pfx_filter
 149    This is used in sorting, so it's more performance sensitive
 150 */
 151 static WCHAR *filter_str_prefix(WCHAR *str, enum prefix_filtering pfx_filter)
 152 {
 153     WCHAR *p = str;
 154
 155     if (pfx_filter == prefix_filtering_none) return str;
 156     if ((p = filter_protocol(str))) str = p;
 157
 158     if (pfx_filter == prefix_filtering_protocol) return str;
 159     if ((p = filter_www(str))) str = p;
 160
 161     return str;
 162 }
 163
 164 static inline int sort_strs_cmpfn_impl(WCHAR *a, WCHAR *b, enum prefix_filtering pfx_filter)
 165 {
 166     WCHAR *str1 = filter_str_prefix(a, pfx_filter);
 167     WCHAR *str2 = filter_str_prefix(b, pfx_filter);
 168     return wcsicmp(str1, str2);
 169 }
 170
 171 static int __cdecl sort_strs_cmpfn_none(const void *a, const void *b)
 172 {
 173     return sort_strs_cmpfn_impl(*(WCHAR* const*)a, *(WCHAR* const*)b, prefix_filtering_none);
 174 }
 175
 176 static int __cdecl sort_strs_cmpfn_protocol(const void *a, const void *b)
 177 {
 178     return sort_strs_cmpfn_impl(*(WCHAR* const*)a, *(WCHAR* const*)b, prefix_filtering_protocol);
 179 }
 180
 181 static int __cdecl sort_strs_cmpfn_all(const void *a, const void *b)
 182 {
 183     return sort_strs_cmpfn_impl(*(WCHAR* const*)a, *(WCHAR* const*)b, prefix_filtering_all);
 184 }
 185
 186 static int (* __cdecl sort_strs_cmpfn[])(const void*, const void*) =
 187 {
 188     sort_strs_cmpfn_none,
 189     sort_strs_cmpfn_protocol,
 190     sort_strs_cmpfn_all
 191 };
 192
 193 static void sort_strs(WCHAR **strs, UINT numstrs, enum prefix_filtering pfx_filter)
 194 {
 195     qsort(strs, numstrs, sizeof(*strs), sort_strs_cmpfn[pfx_filter]);
 196 }
 197
 198 /*
 199    Enumerate all of the strings and sort them in the internal list.
 200
 201    We don't free the enumerated strings (except on error) to avoid needless
 202    copies, until the next reset (or the object itself is destroyed)
 203 */
 204 static void enumerate_strings(IAutoCompleteImpl *ac, enum prefix_filtering pfx_filter)
 205 {
 206     UINT cur = 0, array_size = 1024;
 207     LPOLESTR *strs = NULL, *tmp;
 208     ULONG read;
 209
 210     do
 211     {
 212         if ((tmp = realloc(strs, array_size * sizeof(*strs))) == NULL)
 213             goto fail;
 214         strs = tmp;
 215
 216         do
 217         {
 218             if (FAILED(IEnumString_Next(ac->enumstr, array_size - cur, &strs[cur], &read)))
 219                 read = 0;
 220         } while (read != 0 && (cur += read) < array_size);
 221
 222         array_size *= 2;
 223     } while (read != 0);
 224
 225     /* Allocate even if there were zero strings enumerated, to mark it non-NULL */
 226     if ((tmp = realloc(strs, cur * sizeof(*strs))))
 227     {
 228         strs = tmp;
 229         if (cur > 0)
 230             sort_strs(strs, cur, pfx_filter);
 231
 232         ac->enum_strs = strs;
 233         ac->enum_strs_num = cur;
 234         return;
 235     }
 236
 237 fail:
 238     while (cur--)
 239         CoTaskMemFree(strs[cur]);
 240     free(strs);
 241 }
 242
 243 static UINT find_matching_enum_str(IAutoCompleteImpl *ac, UINT start, WCHAR *text,
 244                                    UINT len, enum prefix_filtering pfx_filter, int direction)
 245 {
 246     WCHAR **strs = ac->enum_strs;
 247     UINT index = ~0, a = start, b = ac->enum_strs_num;
 248     while (a < b)
 249     {
 250         UINT i = (a + b - 1) / 2;
 251         int cmp = wcsnicmp(text, filter_str_prefix(strs[i], pfx_filter), len);
 252         if (cmp == 0)
 253         {
 254             index = i;
 255             cmp   = direction;
 256         }
 257         if (cmp <= 0) b = i;
 258         else          a = i + 1;
 259     }
 260     return index;
 261 }
 262
 263 static void free_enum_strs(IAutoCompleteImpl *ac)
 264 {
 265     WCHAR **strs = ac->enum_strs;
 266     if (strs)
 267     {
 268         UINT i = ac->enum_strs_num;
 269         ac->enum_strs = NULL;
 270         while (i--)
 271             CoTaskMemFree(strs[i]);
 272         free(strs);
 273     }
 274 }
 275
 276 static void hide_listbox(IAutoCompleteImpl *ac, HWND hwnd, BOOL reset)
 277 {
 278     ShowWindow(ac->hwndListBoxOwner, SW_HIDE);
 279     SendMessageW(hwnd, LB_RESETCONTENT, 0, 0);
 280     if (reset) free_enum_strs(ac);
 281 }
 282
 283 static void show_listbox(IAutoCompleteImpl *ac)
 284 {
 285     RECT r;
 286     UINT cnt, width, height;
 287
 288     GetWindowRect(ac->hwndEdit, &r);
 289
 290     /* Windows XP displays 7 lines at most, then it uses a scroll bar */
 291     cnt    = SendMessageW(ac->hwndListBox, LB_GETCOUNT, 0, 0);
 292     height = SendMessageW(ac->hwndListBox, LB_GETITEMHEIGHT, 0, 0) * min(cnt + 1, 7);
 293     width = r.right - r.left;
 294
 295     SetWindowPos(ac->hwndListBoxOwner, HWND_TOP, r.left, r.bottom + 1, width, height,
 296                  SWP_SHOWWINDOW | SWP_NOACTIVATE);
 297 }
 298
 299 static void set_listbox_font(IAutoCompleteImpl *ac, HFONT font)
 300 {
 301     /* We have to calculate the item height manually due to owner-drawn */
 302     HFONT old_font = NULL;
 303     UINT height = 16;
 304     HDC hdc;
 305
 306     if ((hdc = GetDCEx(ac->hwndListBox, 0, DCX_CACHE)))
 307     {
 308         TEXTMETRICW metrics;
 309         if (font) old_font = SelectObject(hdc, font);
 310         if (GetTextMetricsW(hdc, &metrics))
 311             height = metrics.tmHeight;
 312         if (old_font) SelectObject(hdc, old_font);
 313         ReleaseDC(ac->hwndListBox, hdc);
 314     }
 315     SendMessageW(ac->hwndListBox, WM_SETFONT, (WPARAM)font, FALSE);
 316     SendMessageW(ac->hwndListBox, LB_SETITEMHEIGHT, 0, height);
 317 }
 318
 319 static BOOL draw_listbox_item(IAutoCompleteImpl *ac, DRAWITEMSTRUCT *info, UINT id)
 320 {
 321     COLORREF old_text, old_bk;
 322     HDC hdc = info->hDC;
 323     UINT state;
 324     WCHAR *str;
 325
 326     if (info->CtlType != ODT_LISTBOX || info->CtlID != id ||
 327         id != (UINT)GetWindowLongPtrW(ac->hwndListBox, GWLP_ID))
 328         return FALSE;
 329
 330     if ((INT)info->itemID < 0 || info->itemAction == ODA_FOCUS)
 331         return TRUE;
 332
 333     state = info->itemState;
 334     if (state & ODS_SELECTED)
 335     {
 336         old_bk = SetBkColor(hdc, GetSysColor(COLOR_HIGHLIGHT));
 337         old_text = SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT));
 338     }
 339
 340     str = ac->listbox_strs[info->itemID];
 341     ExtTextOutW(hdc, info->rcItem.left + 1, info->rcItem.top,
 342                 ETO_OPAQUE | ETO_CLIPPED, &info->rcItem, str,
 343                 lstrlenW(str), NULL);
 344
 345     if (state & ODS_SELECTED)
 346     {
 347         SetBkColor(hdc, old_bk);
 348         SetTextColor(hdc, old_text);
 349     }
 350     return TRUE;
 351 }
 352
 353 static size_t format_quick_complete(WCHAR *dst, const WCHAR *qc, const WCHAR *str, size_t str_len)
 354 {
 355     /* Replace the first %s directly without using snprintf, to avoid
 356        exploits since the format string can be retrieved from the registry */
 357     WCHAR *base = dst;
 358     UINT args = 0;
 359     while (*qc != '\0')
 360     {
 361         if (qc[0] == '%')
 362         {
 363             if (args < 1 && qc[1] == 's')
 364             {
 365                 memcpy(dst, str, str_len * sizeof(WCHAR));
 366                 dst += str_len;
 367                 qc += 2;
 368                 args++;
 369                 continue;
 370             }
 371             qc += (qc[1] == '%');
 372         }
 373         *dst++ = *qc++;
 374     }
 375     *dst = '\0';
 376     return dst - base;
 377 }
 378
 379 static BOOL select_item_with_return_key(IAutoCompleteImpl *ac, HWND hwnd)
 380 {
 381     WCHAR *text;
 382     HWND hwndListBox = ac->hwndListBox;
 383     if (!(ac->options & ACO_AUTOSUGGEST))
 384         return FALSE;
 385
 386     if (IsWindowVisible(ac->hwndListBoxOwner))
 387     {
 388         INT sel = SendMessageW(hwndListBox, LB_GETCURSEL, 0, 0);
 389         if (sel >= 0)
 390         {
 391             text = ac->listbox_strs[sel];
 392             set_text_and_selection(ac, hwnd, text, 0, lstrlenW(text));
 393             hide_listbox(ac, hwndListBox, TRUE);
 394             ac->no_fwd_char = '\r';  /* RETURN char */
 395             return TRUE;
 396         }
 397     }
 398     hide_listbox(ac, hwndListBox, TRUE);
 399     return FALSE;
 400 }
 401
 402 static LRESULT change_selection(IAutoCompleteImpl *ac, HWND hwnd, UINT key)
 403 {
 404     WCHAR *msg;
 405     UINT len;
 406
 407     INT count = SendMessageW(ac->hwndListBox, LB_GETCOUNT, 0, 0);
 408     INT sel = SendMessageW(ac->hwndListBox, LB_GETCURSEL, 0, 0);
 409     if (key == VK_PRIOR || key == VK_NEXT)
 410     {
 411         if (sel < 0)
 412             sel = (key == VK_PRIOR) ? count - 1 : 0;
 413         else
 414         {
 415             INT base = SendMessageW(ac->hwndListBox, LB_GETTOPINDEX, 0, 0);
 416             INT pgsz = SendMessageW(ac->hwndListBox, LB_GETLISTBOXINFO, 0, 0);
 417             pgsz = max(pgsz - 1, 1);
 418             if (key == VK_PRIOR)
 419             {
 420                 if (sel == 0)
 421                     sel = -1;
 422                 else
 423                 {
 424                     if (sel == base) base -= min(base, pgsz);
 425                     sel = base;
 426                 }
 427             }
 428             else
 429             {
 430                 if (sel == count - 1)
 431                     sel = -1;
 432                 else
 433                 {
 434                     base += pgsz;
 435                     if (sel >= base) base += pgsz;
 436                     sel = min(base, count - 1);
 437                 }
 438             }
 439         }
 440     }
 441     else if (key == VK_UP || (key == VK_TAB && (GetKeyState(VK_SHIFT) & 0x8000)))
 442         sel = ((sel - 1) < -1) ? count - 1 : sel - 1;
 443     else
 444         sel = ((sel + 1) >= count) ? -1 : sel + 1;
 445
 446     SendMessageW(ac->hwndListBox, LB_SETCURSEL, sel, 0);
 447
 448     msg = (sel >= 0) ? ac->listbox_strs[sel] : ac->txtbackup;
 449     len = lstrlenW(msg);
 450     set_text_and_selection(ac, hwnd, msg, len, len);
 451
 452     return 0;
 453 }
 454
 455 static BOOL do_aclist_expand(IAutoCompleteImpl *ac, WCHAR *txt, WCHAR *last_delim)
 456 {
 457     WCHAR c = last_delim[1];
 458
 459     free_enum_strs(ac);
 460     IEnumString_Reset(ac->enumstr);  /* call before expand */
 461
 462     last_delim[1] = '\0';
 463     IACList_Expand(ac->aclist, txt);
 464     last_delim[1] = c;
 465     return TRUE;
 466 }
 467
 468 static BOOL aclist_expand(IAutoCompleteImpl *ac, WCHAR *txt)
 469 {
 470     /* call IACList::Expand only when needed, if the
 471        new txt and old_txt require different expansions */
 472
 473     const WCHAR *old_txt = ac->txtbackup;
 474     WCHAR c, *p, *last_delim;
 475     size_t i = 0;
 476
 477     /* always expand if the enumerator was reset */
 478     if (!ac->enum_strs) old_txt = L"";
 479
 480     /* skip the shared prefix */
 481     while ((c = towlower(txt[i])) == towlower(old_txt[i]))
 482     {
 483         if (c == '\0') return FALSE;
 484         i++;
 485     }
 486
 487     /* they differ at this point, check for a delim further in txt */
 488     for (last_delim = NULL, p = &txt[i]; (p = wcspbrk(p, L"\\/")) != NULL; p++)
 489         last_delim = p;
 490     if (last_delim) return do_aclist_expand(ac, txt, last_delim);
 491
 492     /* txt has no delim after i, check for a delim further in old_txt */
 493     if (wcspbrk(&old_txt[i], L"\\/"))
 494     {
 495         /* scan backwards to find the first delim before txt[i] (if any) */
 496         while (i--)
 497             if (wcschr(L"\\/", txt[i]))
 498                 return do_aclist_expand(ac, txt, &txt[i]);
 499
 500         /* Windows doesn't expand without a delim, but it does reset */
 501         free_enum_strs(ac);
 502     }
 503
 504     return FALSE;
 505 }
 506
 507 static void autoappend_str(IAutoCompleteImpl *ac, WCHAR *text, UINT len, WCHAR *str, HWND hwnd)
 508 {
 509     DWORD sel_start;
 510     WCHAR *tmp;
 511     size_t size;
 512
 513     /* Don't auto-append unless the caret is at the end */
 514     SendMessageW(hwnd, EM_GETSEL, (WPARAM)&sel_start, 0);
 515     if (sel_start != len)
 516         return;
 517
 518     /* The character capitalization can be different,
 519        so merge text and str into a new string */
 520     size = len + lstrlenW(&str[len]) + 1;
 521
 522     if ((tmp = malloc(size * sizeof(*tmp))))
 523     {
 524         memcpy(tmp, text, len * sizeof(*tmp));
 525         memcpy(&tmp[len], &str[len], (size - len) * sizeof(*tmp));
 526     }
 527     else tmp = str;
 528
 529     set_text_and_selection(ac, hwnd, tmp, len, size - 1);
 530     if (tmp != str)
 531         free(tmp);
 532 }
 533
 534 static BOOL display_matching_strs(IAutoCompleteImpl *ac, WCHAR *text, UINT len,
 535                                   enum prefix_filtering pfx_filter, HWND hwnd,
 536                                   enum autoappend_flag flag)
 537 {
 538     /* Return FALSE if we need to hide the listbox */
 539     WCHAR **str = ac->enum_strs;
 540     UINT start, end;
 541     if (!str) return !(ac->options & ACO_AUTOSUGGEST);
 542
 543     /* Windows seems to disable autoappend if ACO_NOPREFIXFILTERING is set */
 544     if (!(ac->options & ACO_NOPREFIXFILTERING) && len)
 545     {
 546         start = find_matching_enum_str(ac, 0, text, len, pfx_filter, -1);
 547         if (start == ~0)
 548             return !(ac->options & ACO_AUTOSUGGEST);
 549
 550         if (flag == autoappend_flag_yes)
 551             autoappend_str(ac, text, len, filter_str_prefix(str[start], pfx_filter), hwnd);
 552         if (!(ac->options & ACO_AUTOSUGGEST))
 553             return TRUE;
 554
 555         /* Find the index beyond the last string that matches */
 556         end = find_matching_enum_str(ac, start + 1, text, len, pfx_filter, 1);
 557         end = (end == ~0 ? start : end) + 1;
 558     }
 559     else
 560     {
 561         if (!(ac->options & ACO_AUTOSUGGEST))
 562             return TRUE;
 563         start = 0;
 564         end = ac->enum_strs_num;
 565         if (end == 0)
 566             return FALSE;
 567     }
 568
 569     SendMessageW(ac->hwndListBox, WM_SETREDRAW, FALSE, 0);
 570     SendMessageW(ac->hwndListBox, LB_RESETCONTENT, 0, 0);
 571
 572     ac->listbox_strs = str + start;
 573     SendMessageW(ac->hwndListBox, LB_SETCOUNT, end - start, 0);
 574
 575     show_listbox(ac);
 576     SendMessageW(ac->hwndListBox, WM_SETREDRAW, TRUE, 0);
 577     return TRUE;
 578 }
 579
 580 static enum prefix_filtering setup_prefix_filtering(IAutoCompleteImpl *ac, const WCHAR *text)
 581 {
 582     enum prefix_filtering pfx_filter;
 583     if (!(ac->options & ACO_FILTERPREFIXES)) return prefix_filtering_none;
 584
 585     pfx_filter = get_text_prefix_filtering(text);
 586     if (!ac->enum_strs) return pfx_filter;
 587
 588     /* If the prefix filtering is different, re-sort the filtered strings */
 589     if (pfx_filter != get_text_prefix_filtering(ac->txtbackup))
 590         sort_strs(ac->enum_strs, ac->enum_strs_num, pfx_filter);
 591
 592     return pfx_filter;
 593 }
 594
 595 static void autocomplete_text(IAutoCompleteImpl *ac, HWND hwnd, enum autoappend_flag flag)
 596 {
 597     WCHAR *text;
 598     BOOL expanded = FALSE;
 599     enum prefix_filtering pfx_filter;
 600     UINT size, len = SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
 601
 602     if (flag != autoappend_flag_displayempty && len == 0)
 603     {
 604         if (ac->options & ACO_AUTOSUGGEST)
 605             hide_listbox(ac, ac->hwndListBox, FALSE);
 606         free_enum_strs(ac);
 607         return;
 608     }
 609
 610     size = len + 1;
 611     if (!(text = malloc(size * sizeof(WCHAR))))
 612     {
 613         /* Reset the listbox to prevent potential crash from ResetEnumerator */
 614         SendMessageW(ac->hwndListBox, LB_RESETCONTENT, 0, 0);
 615         return;
 616     }
 617     len = SendMessageW(hwnd, WM_GETTEXT, size, (LPARAM)text);
 618     if (len + 1 != size)
 619         text = realloc(text, (len + 1) * sizeof(WCHAR));
 620
 621     if (ac->aclist)
 622     {
 623         if (text[len - 1] == '\\' || text[len - 1] == '/')
 624             flag = autoappend_flag_no;
 625         expanded = aclist_expand(ac, text);
 626     }
 627     pfx_filter = setup_prefix_filtering(ac, text);
 628
 629     if (expanded || !ac->enum_strs)
 630     {
 631         if (!expanded) IEnumString_Reset(ac->enumstr);
 632         enumerate_strings(ac, pfx_filter);
 633     }
 634
 635     /* Set txtbackup to point to text itself (which must not be released),
 636        and it must be done here since aclist_expand uses it to track changes */
 637     free(ac->txtbackup);
 638     ac->txtbackup = text;
 639
 640     if (!display_matching_strs(ac, text, len, pfx_filter, hwnd, flag))
 641         hide_listbox(ac, ac->hwndListBox, FALSE);
 642 }
 643
 644 static void destroy_autocomplete_object(IAutoCompleteImpl *ac)
 645 {
 646     ac->hwndEdit = NULL;
 647     free_enum_strs(ac);
 648     if (ac->hwndListBoxOwner)
 649         DestroyWindow(ac->hwndListBoxOwner);
 650     IAutoComplete2_Release(&ac->IAutoComplete2_iface);
 651 }
 652
 653 /*
 654    Helper for ACEditSubclassProc
 655 */
 656 static LRESULT ACEditSubclassProc_KeyDown(IAutoCompleteImpl *ac, HWND hwnd, UINT uMsg,
 657                                           WPARAM wParam, LPARAM lParam)
 658 {
 659     switch (wParam)
 660     {
 661         case VK_ESCAPE:
 662             /* When pressing ESC, Windows hides the auto-suggest listbox, if visible */
 663             if ((ac->options & ACO_AUTOSUGGEST) && IsWindowVisible(ac->hwndListBoxOwner))
 664             {
 665                 hide_listbox(ac, ac->hwndListBox, FALSE);
 666                 ac->no_fwd_char = 0x1B;  /* ESC char */
 667                 return 0;
 668             }
 669             break;
 670         case VK_RETURN:
 671             /* If quickComplete is set and control is pressed, replace the string */
 672             if (ac->quickComplete && (GetKeyState(VK_CONTROL) & 0x8000))
 673             {
 674                 WCHAR *text, *buf;
 675                 size_t sz;
 676                 UINT len = SendMessageW(hwnd, WM_GETTEXTLENGTH, 0, 0);
 677                 ac->no_fwd_char = '\n';  /* CTRL+RETURN char */
 678
 679                 if (!(text = malloc((len + 1) * sizeof(WCHAR))))
 680                     return 0;
 681                 len = SendMessageW(hwnd, WM_GETTEXT, len + 1, (LPARAM)text);
 682                 sz = lstrlenW(ac->quickComplete) + 1 + len;
 683
 684                 if ((buf = malloc(sz * sizeof(WCHAR))))
 685                 {
 686                     len = format_quick_complete(buf, ac->quickComplete, text, len);
 687                     set_text_and_selection(ac, hwnd, buf, 0, len);
 688                     free(buf);
 689                 }
 690
 691                 if (ac->options & ACO_AUTOSUGGEST)
 692                     hide_listbox(ac, ac->hwndListBox, TRUE);
 693                 free(text);
 694                 return 0;
 695             }
 696
 697             if (select_item_with_return_key(ac, hwnd))
 698                 return 0;
 699             break;
 700         case VK_TAB:
 701             if ((ac->options & (ACO_AUTOSUGGEST | ACO_USETAB)) == (ACO_AUTOSUGGEST | ACO_USETAB)
 702                 && IsWindowVisible(ac->hwndListBoxOwner) && !(GetKeyState(VK_CONTROL) & 0x8000))
 703             {
 704                 ac->no_fwd_char = '\t';
 705                 return change_selection(ac, hwnd, wParam);
 706             }
 707             break;
 708         case VK_UP:
 709         case VK_DOWN:
 710         case VK_PRIOR:
 711         case VK_NEXT:
 712             /* Two cases here:
 713                - if the listbox is not visible and ACO_UPDOWNKEYDROPSLIST is
 714                  set, display it with all the entries, without selecting any
 715                - if the listbox is visible, change the selection
 716             */
 717             if (!(ac->options & ACO_AUTOSUGGEST))
 718                 break;
 719
 720             if (!IsWindowVisible(ac->hwndListBoxOwner))
 721             {
 722                 if (ac->options & ACO_UPDOWNKEYDROPSLIST)
 723                 {
 724                     autocomplete_text(ac, hwnd, autoappend_flag_displayempty);
 725                     return 0;
 726                 }
 727             }
 728             else
 729                 return change_selection(ac, hwnd, wParam);
 730             break;
 731         case VK_DELETE:
 732         {
 733             LRESULT ret = CallWindowProcW(ac->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 734             autocomplete_text(ac, hwnd, autoappend_flag_no);
 735             return ret;
 736         }
 737     }
 738     ac->no_fwd_char = '\0';
 739     return CallWindowProcW(ac->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 740 }
 741
 742 /*
 743   Window procedure for autocompletion
 744  */
 745 static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 746 {
 747     IAutoCompleteImpl *This = GetPropW(hwnd, autocomplete_propertyW);
 748     LRESULT ret;
 749
 750     if (!This->enabled) return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 751
 752     switch (uMsg)
 753     {
 754         case CB_SHOWDROPDOWN:
 755             if (This->options & ACO_AUTOSUGGEST)
 756                 hide_listbox(This, This->hwndListBox, TRUE);
 757             return 0;
 758         case WM_KILLFOCUS:
 759             if (This->options & ACO_AUTOSUGGEST)
 760             {
 761                 if (This->hwndListBoxOwner == (HWND)wParam ||
 762                     This->hwndListBoxOwner == GetAncestor((HWND)wParam, GA_PARENT))
 763                     break;
 764                 hide_listbox(This, This->hwndListBox, FALSE);
 765             }
 766
 767             /* Reset the enumerator if it's not visible anymore */
 768             if (!IsWindowVisible(hwnd)) free_enum_strs(This);
 769             break;
 770         case WM_WINDOWPOSCHANGED:
 771         {
 772             WINDOWPOS *pos = (WINDOWPOS*)lParam;
 773
 774             if ((pos->flags & (SWP_NOMOVE | SWP_NOSIZE)) != (SWP_NOMOVE | SWP_NOSIZE) &&
 775                 This->hwndListBoxOwner && IsWindowVisible(This->hwndListBoxOwner))
 776                 show_listbox(This);
 777             break;
 778         }
 779         case WM_KEYDOWN:
 780             return ACEditSubclassProc_KeyDown(This, hwnd, uMsg, wParam, lParam);
 781         case WM_CHAR:
 782         case WM_UNICHAR:
 783             if (wParam == This->no_fwd_char) return 0;
 784             This->no_fwd_char = '\0';
 785
 786             /* Don't autocomplete at all on most control characters */
 787             if (wParam < 32 && !(wParam >= '\b' && wParam <= '\r'))
 788                 break;
 789
 790             ret = CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 791             autocomplete_text(This, hwnd, (This->options & ACO_AUTOAPPEND) && wParam >= ' '
 792                                           ? autoappend_flag_yes : autoappend_flag_no);
 793             return ret;
 794         case WM_SETTEXT:
 795             if (This->options & ACO_AUTOSUGGEST)
 796                 hide_listbox(This, This->hwndListBox, TRUE);
 797             break;
 798         case WM_CUT:
 799         case WM_CLEAR:
 800         case WM_UNDO:
 801             ret = CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 802             autocomplete_text(This, hwnd, autoappend_flag_no);
 803             return ret;
 804         case WM_PASTE:
 805             ret = CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 806             autocomplete_text(This, hwnd, (This->options & ACO_AUTOAPPEND)
 807                                           ? autoappend_flag_yes : autoappend_flag_no);
 808             return ret;
 809         case WM_MOUSEWHEEL:
 810             if ((This->options & ACO_AUTOSUGGEST) && IsWindowVisible(This->hwndListBoxOwner))
 811                 return SendMessageW(This->hwndListBox, WM_MOUSEWHEEL, wParam, lParam);
 812             break;
 813         case WM_SETFONT:
 814             if (This->hwndListBox)
 815                 set_listbox_font(This, (HFONT)wParam);
 816             break;
 817         case WM_DESTROY:
 818         {
 819             WNDPROC proc = This->wpOrigEditProc;
 820
 821             SetWindowLongPtrW(hwnd, GWLP_WNDPROC, (LONG_PTR)proc);
 822             RemovePropW(hwnd, autocomplete_propertyW);
 823             destroy_autocomplete_object(This);
 824             return CallWindowProcW(proc, hwnd, uMsg, wParam, lParam);
 825         }
 826     }
 827     return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 828 }
 829
 830 static LRESULT APIENTRY ACLBoxSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 831 {
 832     IAutoCompleteImpl *This = (IAutoCompleteImpl *)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 833     WCHAR *msg;
 834     INT sel;
 835
 836     switch (uMsg) {
 837         case WM_MOUSEACTIVATE:
 838             return MA_NOACTIVATE;
 839         case WM_MOUSEMOVE:
 840             sel = SendMessageW(hwnd, LB_ITEMFROMPOINT, 0, lParam);
 841             SendMessageW(hwnd, LB_SETCURSEL, sel, 0);
 842             return 0;
 843         case WM_LBUTTONDOWN:
 844             sel = SendMessageW(hwnd, LB_GETCURSEL, 0, 0);
 845             if (sel < 0)
 846                 return 0;
 847             msg = This->listbox_strs[sel];
 848             set_text_and_selection(This, This->hwndEdit, msg, 0, lstrlenW(msg));
 849             hide_listbox(This, hwnd, TRUE);
 850             return 0;
 851     }
 852     return CallWindowProcW(This->wpOrigLBoxProc, hwnd, uMsg, wParam, lParam);
 853 }
 854
 855 static LRESULT APIENTRY ACLBoxOwnerSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 856 {
 857     IAutoCompleteImpl *This = (IAutoCompleteImpl*)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 858
 859     switch (uMsg)
 860     {
 861         case WM_MOUSEACTIVATE:
 862             return MA_NOACTIVATE;
 863         case WM_DRAWITEM:
 864             if (draw_listbox_item(This, (DRAWITEMSTRUCT*)lParam, wParam))
 865                 return TRUE;
 866             break;
 867         case WM_SIZE:
 868             SetWindowPos(This->hwndListBox, NULL, 0, 0, LOWORD(lParam), HIWORD(lParam),
 869                          SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER | SWP_DEFERERASE);
 870             break;
 871     }
 872     return CallWindowProcW(This->wpOrigLBoxOwnerProc, hwnd, uMsg, wParam, lParam);
 873 }
 874
 875 static void create_listbox(IAutoCompleteImpl *This)
 876 {
 877     This->hwndListBoxOwner = CreateWindowExW(WS_EX_NOACTIVATE, WC_STATICW, NULL,
 878                                              WS_BORDER | WS_POPUP | WS_CLIPCHILDREN,
 879                                              0, 0, 0, 0, NULL, NULL, shell32_hInstance, NULL);
 880     if (!This->hwndListBoxOwner)
 881     {
 882         This->options &= ~ACO_AUTOSUGGEST;
 883         return;
 884     }
 885
 886     /* FIXME : The listbox should be resizable with the mouse. WS_THICKFRAME looks ugly */
 887     This->hwndListBox = CreateWindowExW(WS_EX_NOACTIVATE, WC_LISTBOXW, NULL,
 888                                         WS_CHILD | WS_VISIBLE | WS_VSCROLL | LBS_NODATA | LBS_OWNERDRAWFIXED | LBS_NOINTEGRALHEIGHT,
 889                                         0, 0, 0, 0, This->hwndListBoxOwner, NULL, shell32_hInstance, NULL);
 890
 891     if (This->hwndListBox) {
 892         HFONT edit_font;
 893
 894         This->wpOrigLBoxProc = (WNDPROC) SetWindowLongPtrW( This->hwndListBox, GWLP_WNDPROC, (LONG_PTR) ACLBoxSubclassProc);
 895         SetWindowLongPtrW( This->hwndListBox, GWLP_USERDATA, (LONG_PTR)This);
 896
 897         This->wpOrigLBoxOwnerProc = (WNDPROC)SetWindowLongPtrW(This->hwndListBoxOwner, GWLP_WNDPROC, (LONG_PTR)ACLBoxOwnerSubclassProc);
 898         SetWindowLongPtrW(This->hwndListBoxOwner, GWLP_USERDATA, (LONG_PTR)This);
 899
 900         /* Use the same font as the edit control, as it gets destroyed before it anyway */
 901         edit_font = (HFONT)SendMessageW(This->hwndEdit, WM_GETFONT, 0, 0);
 902         if (edit_font)
 903             set_listbox_font(This, edit_font);
 904         return;
 905     }
 906
 907     DestroyWindow(This->hwndListBoxOwner);
 908     This->hwndListBoxOwner = NULL;
 909     This->options &= ~ACO_AUTOSUGGEST;
 910 }
 911
 912 /**************************************************************************
 913  *  AutoComplete_QueryInterface
 914  */
 915 static HRESULT WINAPI IAutoComplete2_fnQueryInterface(
 916     IAutoComplete2 * iface,
 917     REFIID riid,
 918     LPVOID *ppvObj)
 919 {
 920     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 921
 922     TRACE("(%p)->(IID:%s,%p)\n", This, shdebugstr_guid(riid), ppvObj);
 923     *ppvObj = NULL;
 924
 925     if (IsEqualIID(riid, &IID_IUnknown) ||
 926         IsEqualIID(riid, &IID_IAutoComplete) ||
 927         IsEqualIID(riid, &IID_IAutoComplete2))
 928     {
 929         *ppvObj = &This->IAutoComplete2_iface;
 930     }
 931     else if (IsEqualIID(riid, &IID_IAutoCompleteDropDown))
 932     {
 933         *ppvObj = &This->IAutoCompleteDropDown_iface;
 934     }
 935
 936     if (*ppvObj)
 937     {
 938         IUnknown_AddRef((IUnknown*)*ppvObj);
 939         TRACE("-- Interface: (%p)->(%p)\n", ppvObj, *ppvObj);
 940         return S_OK;
 941     }
 942     WARN("unsupported interface: %s\n", debugstr_guid(riid));
 943     return E_NOINTERFACE;
 944 }
 945
 946 /******************************************************************************
 947  * IAutoComplete2_fnAddRef
 948  */
 949 static ULONG WINAPI IAutoComplete2_fnAddRef(
 950         IAutoComplete2 * iface)
 951 {
 952     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 953     ULONG refCount = InterlockedIncrement(&This->ref);
 954
 955     TRACE("(%p)->(%lu)\n", This, refCount - 1);
 956
 957     return refCount;
 958 }
 959
 960 /******************************************************************************
 961  * IAutoComplete2_fnRelease
 962  */
 963 static ULONG WINAPI IAutoComplete2_fnRelease(
 964         IAutoComplete2 * iface)
 965 {
 966     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 967     ULONG refCount = InterlockedDecrement(&This->ref);
 968
 969     TRACE("(%p)->(%lu)\n", This, refCount + 1);
 970
 971     if (!refCount) {
 972         TRACE("destroying IAutoComplete(%p)\n", This);
 973         free(This->quickComplete);
 974         free(This->txtbackup);
 975         if (This->enumstr)
 976             IEnumString_Release(This->enumstr);
 977         if (This->aclist)
 978             IACList_Release(This->aclist);
 979         free(This);
 980     }
 981     return refCount;
 982 }
 983
 984 /******************************************************************************
 985  * IAutoComplete2_fnEnable
 986  */
 987 static HRESULT WINAPI IAutoComplete2_fnEnable(
 988     IAutoComplete2 * iface,
 989     BOOL fEnable)
 990 {
 991     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 992
 993     TRACE("(%p)->(%s)\n", This, (fEnable)?"true":"false");
 994
 995     This->enabled = fEnable;
 996
 997     return S_OK;
 998 }
 999
1000 /******************************************************************************
1001  * IAutoComplete2_fnInit
1002  */
1003 static HRESULT WINAPI IAutoComplete2_fnInit(
1004     IAutoComplete2 * iface,
1005     HWND hwndEdit,
1006     IUnknown *punkACL,
1007     LPCOLESTR pwzsRegKeyPath,
1008     LPCOLESTR pwszQuickComplete)
1009 {
1010     IAutoCompleteImpl *prev, *This = impl_from_IAutoComplete2(iface);
1011
1012     TRACE("(%p)->(%p, %p, %s, %s)\n",
1013           This, hwndEdit, punkACL, debugstr_w(pwzsRegKeyPath), debugstr_w(pwszQuickComplete));
1014
1015     if (This->options & ACO_SEARCH) FIXME(" ACO_SEARCH not supported\n");
1016     if (This->options & ACO_RTLREADING) FIXME(" ACO_RTLREADING not supported\n");
1017     if (This->options & ACO_WORD_FILTER) FIXME(" ACO_WORD_FILTER not supported\n");
1018
1019     if (!hwndEdit || !punkACL)
1020         return E_INVALIDARG;
1021
1022     if (This->initialized)
1023     {
1024         WARN("Autocompletion object is already initialized\n");
1025         /* This->hwndEdit is set to NULL when the edit window is destroyed. */
1026         return This->hwndEdit ? E_FAIL : E_UNEXPECTED;
1027     }
1028
1029     if (FAILED (IUnknown_QueryInterface (punkACL, &IID_IEnumString, (LPVOID*)&This->enumstr))) {
1030         WARN("No IEnumString interface\n");
1031         return E_NOINTERFACE;
1032     }
1033
1034     /* Prevent txtbackup from ever being NULL to simplify aclist_expand */
1035     if ((This->txtbackup = calloc(1, sizeof(WCHAR))) == NULL)
1036     {
1037         IEnumString_Release(This->enumstr);
1038         This->enumstr = NULL;
1039         return E_OUTOFMEMORY;
1040     }
1041
1042     if (FAILED (IUnknown_QueryInterface (punkACL, &IID_IACList, (LPVOID*)&This->aclist)))
1043         This->aclist = NULL;
1044
1045     This->initialized = TRUE;
1046     This->hwndEdit = hwndEdit;
1047
1048     /* If another AutoComplete object was previously assigned to this edit control,
1049        release it but keep the same callback on the control, to avoid an infinite
1050        recursive loop in ACEditSubclassProc while the property is set to this object */
1051     prev = GetPropW(hwndEdit, autocomplete_propertyW);
1052     SetPropW(hwndEdit, autocomplete_propertyW, This);
1053
1054     if (prev && prev->initialized) {
1055         This->wpOrigEditProc = prev->wpOrigEditProc;
1056         destroy_autocomplete_object(prev);
1057     }
1058     else
1059         This->wpOrigEditProc = (WNDPROC) SetWindowLongPtrW(hwndEdit, GWLP_WNDPROC, (LONG_PTR) ACEditSubclassProc);
1060
1061     /* Keep at least one reference to the object until the edit window is destroyed */
1062     IAutoComplete2_AddRef(&This->IAutoComplete2_iface);
1063
1064     if (This->options & ACO_AUTOSUGGEST)
1065         create_listbox(This);
1066
1067     if (pwzsRegKeyPath)
1068     {
1069         static const HKEY roots[] = { HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE };
1070         WCHAR *key, *value;
1071         DWORD type, sz;
1072         BYTE *qc;
1073         HKEY hKey;
1074         LSTATUS res;
1075         size_t len;
1076         UINT i;
1077
1078         /* pwszRegKeyPath contains the key as well as the value, so split it */
1079         value = wcsrchr(pwzsRegKeyPath, '\\');
1080         len = value - pwzsRegKeyPath;
1081
1082         if (value && (key = malloc((len + 1) * sizeof(*key))) != NULL)
1083         {
1084             memcpy(key, pwzsRegKeyPath, len * sizeof(*key));
1085             key[len] = '\0';
1086             value++;
1087
1088             for (i = 0; i < ARRAY_SIZE(roots); i++)
1089             {
1090                 if (RegOpenKeyExW(roots[i], key, 0, KEY_READ, &hKey) != ERROR_SUCCESS)
1091                     continue;
1092                 sz = MAX_PATH * sizeof(WCHAR);
1093
1094                 while ((qc = malloc(sz)) != NULL)
1095                 {
1096                     res = RegQueryValueExW(hKey, value, NULL, &type, qc, &sz);
1097                     if (res == ERROR_SUCCESS && type == REG_SZ)
1098                     {
1099                         This->quickComplete = realloc(qc, sz);
1100                         i = ARRAY_SIZE(roots);
1101                         break;
1102                     }
1103                     free(qc);
1104                     if (res != ERROR_MORE_DATA || type != REG_SZ)
1105                         break;
1106                 }
1107                 RegCloseKey(hKey);
1108             }
1109             free(key);
1110         }
1111     }
1112
1113     if (!This->quickComplete && pwszQuickComplete)
1114     {
1115         size_t len = lstrlenW(pwszQuickComplete)+1;
1116         if ((This->quickComplete = malloc(len * sizeof(WCHAR))) != NULL)
1117             memcpy(This->quickComplete, pwszQuickComplete, len * sizeof(WCHAR));
1118     }
1119
1120     return S_OK;
1121 }
1122
1123 /**************************************************************************
1124  *  IAutoComplete2_fnGetOptions
1125  */
1126 static HRESULT WINAPI IAutoComplete2_fnGetOptions(
1127     IAutoComplete2 * iface,
1128     DWORD *pdwFlag)
1129 {
1130     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
1131
1132     TRACE("(%p) -> (%p)\n", This, pdwFlag);
1133
1134     *pdwFlag = This->options;
1135
1136     return S_OK;
1137 }
1138
1139 /**************************************************************************
1140  *  IAutoComplete2_fnSetOptions
1141  */
1142 static HRESULT WINAPI IAutoComplete2_fnSetOptions(
1143     IAutoComplete2 * iface,
1144     DWORD dwFlag)
1145 {
1146     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
1147     DWORD changed = This->options ^ dwFlag;
1148     HRESULT hr = S_OK;
1149
1150     TRACE("(%p) -> (0x%lx)\n", This, dwFlag);
1151
1152     This->options = dwFlag;
1153
1154     if ((This->options & ACO_AUTOSUGGEST) && This->hwndEdit && !This->hwndListBox)
1155         create_listbox(This);
1156     else if (!(This->options & ACO_AUTOSUGGEST) && This->hwndListBox)
1157         hide_listbox(This, This->hwndListBox, TRUE);
1158
1159     /* If ACO_FILTERPREFIXES changed we might have to reset the enumerator */
1160     if ((changed & ACO_FILTERPREFIXES) && This->txtbackup)
1161     {
1162         if (get_text_prefix_filtering(This->txtbackup) != prefix_filtering_none)
1163             IAutoCompleteDropDown_ResetEnumerator(&This->IAutoCompleteDropDown_iface);
1164     }
1165
1166     return hr;
1167 }
1168
1169 /**************************************************************************
1170  *  IAutoComplete2 VTable
1171  */
1172 static const IAutoComplete2Vtbl acvt =
1173 {
1174     IAutoComplete2_fnQueryInterface,
1175     IAutoComplete2_fnAddRef,
1176     IAutoComplete2_fnRelease,
1177     IAutoComplete2_fnInit,
1178     IAutoComplete2_fnEnable,
1179     /* IAutoComplete2 */
1180     IAutoComplete2_fnSetOptions,
1181     IAutoComplete2_fnGetOptions,
1182 };
1183
1184
1185 static HRESULT WINAPI IAutoCompleteDropDown_fnQueryInterface(IAutoCompleteDropDown *iface,
1186             REFIID riid, LPVOID *ppvObj)
1187 {
1188     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
1189     return IAutoComplete2_QueryInterface(&This->IAutoComplete2_iface, riid, ppvObj);
1190 }
1191
1192 static ULONG WINAPI IAutoCompleteDropDown_fnAddRef(IAutoCompleteDropDown *iface)
1193 {
1194     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
1195     return IAutoComplete2_AddRef(&This->IAutoComplete2_iface);
1196 }
1197
1198 static ULONG WINAPI IAutoCompleteDropDown_fnRelease(IAutoCompleteDropDown *iface)
1199 {
1200     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
1201     return IAutoComplete2_Release(&This->IAutoComplete2_iface);
1202 }
1203
1204 /**************************************************************************
1205  *  IAutoCompleteDropDown_fnGetDropDownStatus
1206  */
1207 static HRESULT WINAPI IAutoCompleteDropDown_fnGetDropDownStatus(
1208     IAutoCompleteDropDown *iface,
1209     DWORD *pdwFlags,
1210     LPWSTR *ppwszString)
1211 {
1212     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
1213     BOOL dropped;
1214
1215     TRACE("(%p) -> (%p, %p)\n", This, pdwFlags, ppwszString);
1216
1217     dropped = IsWindowVisible(This->hwndListBoxOwner);
1218
1219     if (pdwFlags)
1220         *pdwFlags = (dropped ? ACDD_VISIBLE : 0);
1221
1222     if (ppwszString) {
1223         if (dropped) {
1224             int sel;
1225
1226             sel = SendMessageW(This->hwndListBox, LB_GETCURSEL, 0, 0);
1227             if (sel >= 0)
1228             {
1229                 WCHAR *str = This->listbox_strs[sel];
1230                 size_t size = (lstrlenW(str) + 1) * sizeof(*str);
1231
1232                 if (!(*ppwszString = CoTaskMemAlloc(size)))
1233                     return E_OUTOFMEMORY;
1234                 memcpy(*ppwszString, str, size);
1235             }
1236             else
1237                 *ppwszString = NULL;
1238         }
1239         else
1240             *ppwszString = NULL;
1241     }
1242
1243     return S_OK;
1244 }
1245
1246 /**************************************************************************
1247  *  IAutoCompleteDropDown_fnResetEnumarator
1248  */
1249 static HRESULT WINAPI IAutoCompleteDropDown_fnResetEnumerator(
1250     IAutoCompleteDropDown *iface)
1251 {
1252     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
1253
1254     TRACE("(%p)\n", This);
1255
1256     if (This->hwndEdit)
1257     {
1258         free_enum_strs(This);
1259         if ((This->options & ACO_AUTOSUGGEST) && IsWindowVisible(This->hwndListBoxOwner))
1260             autocomplete_text(This, This->hwndEdit, autoappend_flag_displayempty);
1261     }
1262     return S_OK;
1263 }
1264
1265 /**************************************************************************
1266  *  IAutoCompleteDropDown VTable
1267  */
1268 static const IAutoCompleteDropDownVtbl acdropdownvt =
1269 {
1270     IAutoCompleteDropDown_fnQueryInterface,
1271     IAutoCompleteDropDown_fnAddRef,
1272     IAutoCompleteDropDown_fnRelease,
1273     IAutoCompleteDropDown_fnGetDropDownStatus,
1274     IAutoCompleteDropDown_fnResetEnumerator,
1275 };
1276
1277 /**************************************************************************
1278  *  IAutoComplete_Constructor
1279  */
1280 HRESULT WINAPI IAutoComplete_Constructor(IUnknown * pUnkOuter, REFIID riid, LPVOID * ppv)
1281 {
1282     IAutoCompleteImpl *lpac;
1283     HRESULT hr;
1284
1285     if (pUnkOuter && !IsEqualIID (riid, &IID_IUnknown))
1286         return CLASS_E_NOAGGREGATION;
1287
1288     lpac = calloc(1, sizeof(*lpac));
1289     if (!lpac)
1290         return E_OUTOFMEMORY;
1291
1292     lpac->ref = 1;
1293     lpac->IAutoComplete2_iface.lpVtbl = &acvt;
1294     lpac->IAutoCompleteDropDown_iface.lpVtbl = &acdropdownvt;
1295     lpac->enabled = TRUE;
1296     lpac->options = ACO_AUTOAPPEND;
1297
1298     hr = IAutoComplete2_QueryInterface(&lpac->IAutoComplete2_iface, riid, ppv);
1299     IAutoComplete2_Release(&lpac->IAutoComplete2_iface);
1300
1301     TRACE("-- (%p)->\n",lpac);
1302
1303     return hr;
1304 }