dlls/shell32/autocomplete.c

   1 /*
   2  *      AutoComplete interfaces implementation.
   3  *
   4  *      Copyright 2004  Maxime Bellengé <maxime.bellenge@laposte.net>
   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
  21 /*
  22   Implemented:
  23   - ACO_AUTOAPPEND style
  24   - ACO_AUTOSUGGEST style
  25   - ACO_UPDOWNKEYDROPSLIST style
  26
  27   - Handle pwzsRegKeyPath and pwszQuickComplete in Init
  28
  29   TODO:
  30   - implement ACO_SEARCH style
  31   - implement ACO_FILTERPREFIXES style
  32   - implement ACO_USETAB style
  33   - implement ACO_RTLREADING style
  34   - implement ResetEnumerator
  35   - string compares should be case-insensitive, the content of the list should be sorted
  36
  37  */
  38 #include "config.h"
  39
  40 #include <stdarg.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #define COBJMACROS
  45
  46 #include "wine/debug.h"
  47 #include "windef.h"
  48 #include "winbase.h"
  49 #include "winreg.h"
  50 #include "undocshell.h"
  51 #include "shlwapi.h"
  52 #include "winerror.h"
  53 #include "objbase.h"
  54
  55 #include "pidl.h"
  56 #include "shlobj.h"
  57 #include "shldisp.h"
  58 #include "debughlp.h"
  59 #include "shell32_main.h"
  60
  61 #include "wine/unicode.h"
  62
  63 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  64
  65 typedef struct
  66 {
  67     IAutoComplete2 IAutoComplete2_iface;
  68     IAutoCompleteDropDown IAutoCompleteDropDown_iface;
  69     LONG ref;
  70     BOOL initialized;
  71     BOOL enabled;
  72     HWND hwndEdit;
  73     HWND hwndListBox;
  74     WNDPROC wpOrigEditProc;
  75     WNDPROC wpOrigLBoxProc;
  76     WCHAR *txtbackup;
  77     WCHAR *quickComplete;
  78     IEnumString *enumstr;
  79     AUTOCOMPLETEOPTIONS options;
  80 } IAutoCompleteImpl;
  81
  82 static const WCHAR autocomplete_propertyW[] = {'W','i','n','e',' ','A','u','t','o',
  83                                                'c','o','m','p','l','e','t','e',' ',
  84                                                'c','o','n','t','r','o','l',0};
  85
  86 static inline IAutoCompleteImpl *impl_from_IAutoComplete2(IAutoComplete2 *iface)
  87 {
  88     return CONTAINING_RECORD(iface, IAutoCompleteImpl, IAutoComplete2_iface);
  89 }
  90
  91 static inline IAutoCompleteImpl *impl_from_IAutoCompleteDropDown(IAutoCompleteDropDown *iface)
  92 {
  93     return CONTAINING_RECORD(iface, IAutoCompleteImpl, IAutoCompleteDropDown_iface);
  94 }
  95
  96 /*
  97   Window procedure for autocompletion
  98  */
  99 static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 100 {
 101     IAutoCompleteImpl *This = GetPropW(hwnd, autocomplete_propertyW);
 102     LPOLESTR strs;
 103     HRESULT hr;
 104     WCHAR hwndText[255];
 105     WCHAR *hwndQCText;
 106     RECT r;
 107     BOOL control, filled, displayall = FALSE;
 108     int cpt, height, sel;
 109
 110     if (!This->enabled) return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 111
 112     switch (uMsg)
 113     {
 114         case CB_SHOWDROPDOWN:
 115             ShowWindow(This->hwndListBox, SW_HIDE);
 116             break;
 117         case WM_KILLFOCUS:
 118             if ((This->options & ACO_AUTOSUGGEST) && ((HWND)wParam != This->hwndListBox))
 119             {
 120                 ShowWindow(This->hwndListBox, SW_HIDE);
 121             }
 122             return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 123         case WM_KEYUP:
 124             GetWindowTextW( hwnd, hwndText, sizeof(hwndText)/sizeof(WCHAR));
 125
 126             switch(wParam) {
 127                 case VK_RETURN:
 128                     /* If quickComplete is set and control is pressed, replace the string */
 129                     control = GetKeyState(VK_CONTROL) & 0x8000;
 130                     if (control && This->quickComplete) {
 131                         hwndQCText = HeapAlloc(GetProcessHeap(), 0,
 132                                               (lstrlenW(This->quickComplete)+lstrlenW(hwndText))*sizeof(WCHAR));
 133                         sel = sprintfW(hwndQCText, This->quickComplete, hwndText);
 134                         SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)hwndQCText);
 135                         SendMessageW(hwnd, EM_SETSEL, 0, sel);
 136                         HeapFree(GetProcessHeap(), 0, hwndQCText);
 137                     }
 138
 139                     ShowWindow(This->hwndListBox, SW_HIDE);
 140                     return 0;
 141                 case VK_LEFT:
 142                 case VK_RIGHT:
 143                     return 0;
 144                 case VK_UP:
 145                 case VK_DOWN:
 146                     /* Two cases here :
 147                        - if the listbox is not visible, displays it
 148                        with all the entries if the style ACO_UPDOWNKEYDROPSLIST
 149                        is present but does not select anything.
 150                        - if the listbox is visible, change the selection
 151                     */
 152                     if ( (This->options & (ACO_AUTOSUGGEST | ACO_UPDOWNKEYDROPSLIST))
 153                          && (!IsWindowVisible(This->hwndListBox) && (! *hwndText)) )
 154                     {
 155                          /* We must display all the entries */
 156                          displayall = TRUE;
 157                     } else {
 158                         if (IsWindowVisible(This->hwndListBox)) {
 159                             int count;
 160
 161                             count = SendMessageW(This->hwndListBox, LB_GETCOUNT, 0, 0);
 162                             /* Change the selection */
 163                             sel = SendMessageW(This->hwndListBox, LB_GETCURSEL, 0, 0);
 164                             if (wParam == VK_UP)
 165                                 sel = ((sel-1) < 0) ? count-1 : sel-1;
 166                             else
 167                                 sel = ((sel+1) >= count) ? -1 : sel+1;
 168                             SendMessageW(This->hwndListBox, LB_SETCURSEL, sel, 0);
 169                             if (sel != -1) {
 170                                 WCHAR *msg;
 171                                 int len;
 172
 173                                 len = SendMessageW(This->hwndListBox, LB_GETTEXTLEN, sel, 0);
 174                                 msg = HeapAlloc(GetProcessHeap(), 0, (len+1)*sizeof(WCHAR));
 175                                 SendMessageW(This->hwndListBox, LB_GETTEXT, sel, (LPARAM)msg);
 176                                 SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)msg);
 177                                 SendMessageW(hwnd, EM_SETSEL, lstrlenW(msg), lstrlenW(msg));
 178                                 HeapFree(GetProcessHeap(), 0, msg);
 179                             } else {
 180                                 SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)This->txtbackup);
 181                                 SendMessageW(hwnd, EM_SETSEL, lstrlenW(This->txtbackup), lstrlenW(This->txtbackup));
 182                             }
 183                         }
 184                         return 0;
 185                     }
 186                     break;
 187                 case VK_BACK:
 188                 case VK_DELETE:
 189                     if ((! *hwndText) && (This->options & ACO_AUTOSUGGEST)) {
 190                         ShowWindow(This->hwndListBox, SW_HIDE);
 191                         return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 192                     }
 193                     if (This->options & ACO_AUTOAPPEND) {
 194                         DWORD b;
 195                         SendMessageW(hwnd, EM_GETSEL, (WPARAM)&b, 0);
 196                         if (b>1) {
 197                             hwndText[b-1] = '\0';
 198                         } else {
 199                             hwndText[0] = '\0';
 200                             SetWindowTextW(hwnd, hwndText);
 201                         }
 202                     }
 203                     break;
 204                 default:
 205                     ;
 206             }
 207
 208             SendMessageW(This->hwndListBox, LB_RESETCONTENT, 0, 0);
 209
 210             HeapFree(GetProcessHeap(), 0, This->txtbackup);
 211             This->txtbackup = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(hwndText)+1)*sizeof(WCHAR));
 212             lstrcpyW(This->txtbackup, hwndText);
 213
 214             /* Returns if there is no text to search and we doesn't want to display all the entries */
 215             if ((!displayall) && (! *hwndText) )
 216                 break;
 217
 218             IEnumString_Reset(This->enumstr);
 219             filled = FALSE;
 220             for(cpt = 0;;) {
 221                 ULONG fetched;
 222                 hr = IEnumString_Next(This->enumstr, 1, &strs, &fetched);
 223                 if (hr != S_OK)
 224                     break;
 225
 226                 if (StrStrIW(strs, hwndText) == strs) {
 227                     if (!filled && (This->options & ACO_AUTOAPPEND)) {
 228                         INT typed_length = strlenW(hwndText);
 229                         WCHAR buffW[255];
 230
 231                         strcpyW(buffW, hwndText);
 232                         strcatW(buffW, &strs[typed_length]);
 233                         SetWindowTextW(hwnd, buffW);
 234                         SendMessageW(hwnd, EM_SETSEL, typed_length, strlenW(strs));
 235                         if (!(This->options & ACO_AUTOSUGGEST))
 236                             break;
 237                     }
 238
 239                     if (This->options & ACO_AUTOSUGGEST) {
 240                         SendMessageW(This->hwndListBox, LB_ADDSTRING, 0, (LPARAM)strs);
 241                         cpt++;
 242                     }
 243
 244                     filled = TRUE;
 245                 }
 246             }
 247
 248             if (This->options & ACO_AUTOSUGGEST) {
 249                 if (filled) {
 250                     height = SendMessageW(This->hwndListBox, LB_GETITEMHEIGHT, 0, 0);
 251                     SendMessageW(This->hwndListBox, LB_CARETOFF, 0, 0);
 252                     GetWindowRect(hwnd, &r);
 253                     SetParent(This->hwndListBox, HWND_DESKTOP);
 254                     /* It seems that Windows XP displays 7 lines at most
 255                        and otherwise displays a vertical scroll bar */
 256                     SetWindowPos(This->hwndListBox, HWND_TOP,
 257                                  r.left, r.bottom + 1, r.right - r.left, min(height * 7, height*(cpt+1)),
 258                                  SWP_SHOWWINDOW );
 259                 } else {
 260                     ShowWindow(This->hwndListBox, SW_HIDE);
 261                 }
 262             }
 263
 264             break;
 265         case WM_DESTROY:
 266         {
 267             WNDPROC proc = This->wpOrigEditProc;
 268
 269             RemovePropW(hwnd, autocomplete_propertyW);
 270             SetWindowLongPtrW(hwnd, GWLP_WNDPROC, (LONG_PTR)proc);
 271             This->hwndEdit = NULL;
 272             if (This->hwndListBox)
 273                     DestroyWindow(This->hwndListBox);
 274             IAutoComplete2_Release(&This->IAutoComplete2_iface);
 275             return CallWindowProcW(proc, hwnd, uMsg, wParam, lParam);
 276         }
 277         default:
 278             return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 279
 280     }
 281
 282     return 0;
 283 }
 284
 285 static LRESULT APIENTRY ACLBoxSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 286 {
 287     IAutoCompleteImpl *This = (IAutoCompleteImpl *)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 288     WCHAR *msg;
 289     int sel, len;
 290
 291     switch (uMsg) {
 292         case WM_MOUSEMOVE:
 293             sel = SendMessageW(hwnd, LB_ITEMFROMPOINT, 0, lParam);
 294             SendMessageW(hwnd, LB_SETCURSEL, sel, 0);
 295             break;
 296         case WM_LBUTTONDOWN:
 297             sel = SendMessageW(hwnd, LB_GETCURSEL, 0, 0);
 298             if (sel < 0)
 299                 break;
 300             len = SendMessageW(This->hwndListBox, LB_GETTEXTLEN, sel, 0);
 301             msg = HeapAlloc(GetProcessHeap(), 0, (len+1)*sizeof(WCHAR));
 302             SendMessageW(hwnd, LB_GETTEXT, sel, (LPARAM)msg);
 303             SendMessageW(This->hwndEdit, WM_SETTEXT, 0, (LPARAM)msg);
 304             SendMessageW(This->hwndEdit, EM_SETSEL, 0, lstrlenW(msg));
 305             ShowWindow(hwnd, SW_HIDE);
 306             HeapFree(GetProcessHeap(), 0, msg);
 307             break;
 308         default:
 309             return CallWindowProcW(This->wpOrigLBoxProc, hwnd, uMsg, wParam, lParam);
 310     }
 311     return 0;
 312 }
 313
 314 static void create_listbox(IAutoCompleteImpl *This)
 315 {
 316     HWND hwndParent;
 317
 318     hwndParent = GetParent(This->hwndEdit);
 319
 320     /* FIXME : The listbox should be resizable with the mouse. WS_THICKFRAME looks ugly */
 321     This->hwndListBox = CreateWindowExW(0, WC_LISTBOXW, NULL,
 322                                     WS_BORDER | WS_CHILD | WS_VSCROLL | LBS_HASSTRINGS | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT,
 323                                     CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
 324                                     hwndParent, NULL, shell32_hInstance, NULL );
 325
 326     if (This->hwndListBox) {
 327         This->wpOrigLBoxProc = (WNDPROC) SetWindowLongPtrW( This->hwndListBox, GWLP_WNDPROC, (LONG_PTR) ACLBoxSubclassProc);
 328         SetWindowLongPtrW( This->hwndListBox, GWLP_USERDATA, (LONG_PTR)This);
 329     }
 330 }
 331
 332 /**************************************************************************
 333  *  AutoComplete_QueryInterface
 334  */
 335 static HRESULT WINAPI IAutoComplete2_fnQueryInterface(
 336     IAutoComplete2 * iface,
 337     REFIID riid,
 338     LPVOID *ppvObj)
 339 {
 340     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 341
 342     TRACE("(%p)->(IID:%s,%p)\n", This, shdebugstr_guid(riid), ppvObj);
 343     *ppvObj = NULL;
 344
 345     if (IsEqualIID(riid, &IID_IUnknown) ||
 346         IsEqualIID(riid, &IID_IAutoComplete) ||
 347         IsEqualIID(riid, &IID_IAutoComplete2))
 348     {
 349         *ppvObj = This;
 350     }
 351     else if (IsEqualIID(riid, &IID_IAutoCompleteDropDown))
 352     {
 353         *ppvObj = &This->IAutoCompleteDropDown_iface;
 354     }
 355
 356     if (*ppvObj)
 357     {
 358         IUnknown_AddRef((IUnknown*)*ppvObj);
 359         TRACE("-- Interface: (%p)->(%p)\n", ppvObj, *ppvObj);
 360         return S_OK;
 361     }
 362     WARN("unsupported interface: %s\n", debugstr_guid(riid));
 363     return E_NOINTERFACE;
 364 }
 365
 366 /******************************************************************************
 367  * IAutoComplete2_fnAddRef
 368  */
 369 static ULONG WINAPI IAutoComplete2_fnAddRef(
 370         IAutoComplete2 * iface)
 371 {
 372     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 373     ULONG refCount = InterlockedIncrement(&This->ref);
 374
 375     TRACE("(%p)->(%u)\n", This, refCount - 1);
 376
 377     return refCount;
 378 }
 379
 380 /******************************************************************************
 381  * IAutoComplete2_fnRelease
 382  */
 383 static ULONG WINAPI IAutoComplete2_fnRelease(
 384         IAutoComplete2 * iface)
 385 {
 386     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 387     ULONG refCount = InterlockedDecrement(&This->ref);
 388
 389     TRACE("(%p)->(%u)\n", This, refCount + 1);
 390
 391     if (!refCount) {
 392         TRACE("destroying IAutoComplete(%p)\n", This);
 393         HeapFree(GetProcessHeap(), 0, This->quickComplete);
 394         HeapFree(GetProcessHeap(), 0, This->txtbackup);
 395         if (This->enumstr)
 396             IEnumString_Release(This->enumstr);
 397         HeapFree(GetProcessHeap(), 0, This);
 398     }
 399     return refCount;
 400 }
 401
 402 /******************************************************************************
 403  * IAutoComplete2_fnEnable
 404  */
 405 static HRESULT WINAPI IAutoComplete2_fnEnable(
 406     IAutoComplete2 * iface,
 407     BOOL fEnable)
 408 {
 409     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 410     HRESULT hr = S_OK;
 411
 412     TRACE("(%p)->(%s)\n", This, (fEnable)?"true":"false");
 413
 414     This->enabled = fEnable;
 415
 416     return hr;
 417 }
 418
 419 /******************************************************************************
 420  * IAutoComplete2_fnInit
 421  */
 422 static HRESULT WINAPI IAutoComplete2_fnInit(
 423     IAutoComplete2 * iface,
 424     HWND hwndEdit,
 425     IUnknown *punkACL,
 426     LPCOLESTR pwzsRegKeyPath,
 427     LPCOLESTR pwszQuickComplete)
 428 {
 429     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 430
 431     TRACE("(%p)->(%p, %p, %s, %s)\n",
 432           This, hwndEdit, punkACL, debugstr_w(pwzsRegKeyPath), debugstr_w(pwszQuickComplete));
 433
 434     if (This->options & ACO_SEARCH) FIXME(" ACO_SEARCH not supported\n");
 435     if (This->options & ACO_FILTERPREFIXES) FIXME(" ACO_FILTERPREFIXES not supported\n");
 436     if (This->options & ACO_USETAB) FIXME(" ACO_USETAB not supported\n");
 437     if (This->options & ACO_RTLREADING) FIXME(" ACO_RTLREADING not supported\n");
 438
 439     if (!hwndEdit || !punkACL)
 440         return E_INVALIDARG;
 441
 442     if (This->initialized)
 443     {
 444         WARN("Autocompletion object is already initialized\n");
 445         /* This->hwndEdit is set to NULL when the edit window is destroyed. */
 446         return This->hwndEdit ? E_FAIL : E_UNEXPECTED;
 447     }
 448
 449     if (FAILED (IUnknown_QueryInterface (punkACL, &IID_IEnumString, (LPVOID*)&This->enumstr))) {
 450         WARN("No IEnumString interface\n");
 451         return E_NOINTERFACE;
 452     }
 453
 454     This->initialized = TRUE;
 455     This->hwndEdit = hwndEdit;
 456     This->wpOrigEditProc = (WNDPROC) SetWindowLongPtrW( hwndEdit, GWLP_WNDPROC, (LONG_PTR) ACEditSubclassProc);
 457     /* Keep at least one reference to the object until the edit window is destroyed. */
 458     IAutoComplete2_AddRef(&This->IAutoComplete2_iface);
 459     SetPropW( hwndEdit, autocomplete_propertyW, This );
 460
 461     if (This->options & ACO_AUTOSUGGEST)
 462         create_listbox(This);
 463
 464     if (pwzsRegKeyPath) {
 465         WCHAR *key;
 466         WCHAR result[MAX_PATH];
 467         WCHAR *value;
 468         HKEY hKey = 0;
 469         LONG res;
 470         LONG len;
 471
 472         /* pwszRegKeyPath contains the key as well as the value, so we split */
 473         key = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(pwzsRegKeyPath)+1)*sizeof(WCHAR));
 474         strcpyW(key, pwzsRegKeyPath);
 475         value = strrchrW(key, '\\');
 476         *value = 0;
 477         value++;
 478         /* Now value contains the value and buffer the key */
 479         res = RegOpenKeyExW(HKEY_CURRENT_USER, key, 0, KEY_READ, &hKey);
 480         if (res != ERROR_SUCCESS) {
 481             /* if the key is not found, MSDN states we must seek in HKEY_LOCAL_MACHINE */
 482             res = RegOpenKeyExW(HKEY_LOCAL_MACHINE, key, 0, KEY_READ, &hKey);
 483         }
 484         if (res == ERROR_SUCCESS) {
 485             res = RegQueryValueW(hKey, value, result, &len);
 486             if (res == ERROR_SUCCESS) {
 487                 This->quickComplete = HeapAlloc(GetProcessHeap(), 0, len*sizeof(WCHAR));
 488                 strcpyW(This->quickComplete, result);
 489             }
 490             RegCloseKey(hKey);
 491         }
 492         HeapFree(GetProcessHeap(), 0, key);
 493     }
 494
 495     if ((pwszQuickComplete) && (!This->quickComplete)) {
 496         This->quickComplete = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(pwszQuickComplete)+1)*sizeof(WCHAR));
 497         lstrcpyW(This->quickComplete, pwszQuickComplete);
 498     }
 499
 500     return S_OK;
 501 }
 502
 503 /**************************************************************************
 504  *  IAutoComplete2_fnGetOptions
 505  */
 506 static HRESULT WINAPI IAutoComplete2_fnGetOptions(
 507     IAutoComplete2 * iface,
 508     DWORD *pdwFlag)
 509 {
 510     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 511     HRESULT hr = S_OK;
 512
 513     TRACE("(%p) -> (%p)\n", This, pdwFlag);
 514
 515     *pdwFlag = This->options;
 516
 517     return hr;
 518 }
 519
 520 /**************************************************************************
 521  *  IAutoComplete2_fnSetOptions
 522  */
 523 static HRESULT WINAPI IAutoComplete2_fnSetOptions(
 524     IAutoComplete2 * iface,
 525     DWORD dwFlag)
 526 {
 527     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 528     HRESULT hr = S_OK;
 529
 530     TRACE("(%p) -> (0x%x)\n", This, dwFlag);
 531
 532     This->options = dwFlag;
 533
 534     if ((This->options & ACO_AUTOSUGGEST) && This->hwndEdit && !This->hwndListBox)
 535         create_listbox(This);
 536
 537     return hr;
 538 }
 539
 540 /**************************************************************************
 541  *  IAutoComplete2 VTable
 542  */
 543 static const IAutoComplete2Vtbl acvt =
 544 {
 545     IAutoComplete2_fnQueryInterface,
 546     IAutoComplete2_fnAddRef,
 547     IAutoComplete2_fnRelease,
 548     IAutoComplete2_fnInit,
 549     IAutoComplete2_fnEnable,
 550     /* IAutoComplete2 */
 551     IAutoComplete2_fnSetOptions,
 552     IAutoComplete2_fnGetOptions,
 553 };
 554
 555
 556 static HRESULT WINAPI IAutoCompleteDropDown_fnQueryInterface(IAutoCompleteDropDown *iface,
 557             REFIID riid, LPVOID *ppvObj)
 558 {
 559     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
 560     return IAutoComplete2_fnQueryInterface(&This->IAutoComplete2_iface, riid, ppvObj);
 561 }
 562
 563 static ULONG WINAPI IAutoCompleteDropDown_fnAddRef(IAutoCompleteDropDown *iface)
 564 {
 565     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
 566     return IAutoComplete2_fnAddRef(&This->IAutoComplete2_iface);
 567 }
 568
 569 static ULONG WINAPI IAutoCompleteDropDown_fnRelease(IAutoCompleteDropDown *iface)
 570 {
 571     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
 572     return IAutoComplete2_fnRelease(&This->IAutoComplete2_iface);
 573 }
 574
 575 /**************************************************************************
 576  *  IAutoCompleteDropDown_fnGetDropDownStatus
 577  */
 578 static HRESULT WINAPI IAutoCompleteDropDown_fnGetDropDownStatus(
 579     IAutoCompleteDropDown *iface,
 580     DWORD *pdwFlags,
 581     LPWSTR *ppwszString)
 582 {
 583     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
 584     BOOL dropped;
 585
 586     TRACE("(%p) -> (%p, %p)\n", This, pdwFlags, ppwszString);
 587
 588     dropped = IsWindowVisible(This->hwndListBox);
 589
 590     if (pdwFlags)
 591         *pdwFlags = (dropped ? ACDD_VISIBLE : 0);
 592
 593     if (ppwszString) {
 594         if (dropped) {
 595             int sel;
 596
 597             sel = SendMessageW(This->hwndListBox, LB_GETCURSEL, 0, 0);
 598             if (sel >= 0)
 599             {
 600                 DWORD len;
 601
 602                 len = SendMessageW(This->hwndListBox, LB_GETTEXTLEN, sel, 0);
 603                 *ppwszString = CoTaskMemAlloc((len+1)*sizeof(WCHAR));
 604                 SendMessageW(This->hwndListBox, LB_GETTEXT, sel, (LPARAM)*ppwszString);
 605             }
 606             else
 607                 *ppwszString = NULL;
 608         }
 609         else
 610             *ppwszString = NULL;
 611     }
 612
 613     return S_OK;
 614 }
 615
 616 /**************************************************************************
 617  *  IAutoCompleteDropDown_fnResetEnumarator
 618  */
 619 static HRESULT WINAPI IAutoCompleteDropDown_fnResetEnumerator(
 620     IAutoCompleteDropDown *iface)
 621 {
 622     IAutoCompleteImpl *This = impl_from_IAutoCompleteDropDown(iface);
 623
 624     FIXME("(%p): stub\n", This);
 625
 626     return E_NOTIMPL;
 627 }
 628
 629 /**************************************************************************
 630  *  IAutoCompleteDropDown VTable
 631  */
 632 static const IAutoCompleteDropDownVtbl acdropdownvt =
 633 {
 634     IAutoCompleteDropDown_fnQueryInterface,
 635     IAutoCompleteDropDown_fnAddRef,
 636     IAutoCompleteDropDown_fnRelease,
 637     IAutoCompleteDropDown_fnGetDropDownStatus,
 638     IAutoCompleteDropDown_fnResetEnumerator,
 639 };
 640
 641 /**************************************************************************
 642  *  IAutoComplete_Constructor
 643  */
 644 HRESULT WINAPI IAutoComplete_Constructor(IUnknown * pUnkOuter, REFIID riid, LPVOID * ppv)
 645 {
 646     IAutoCompleteImpl *lpac;
 647     HRESULT hr;
 648
 649     if (pUnkOuter && !IsEqualIID (riid, &IID_IUnknown))
 650         return CLASS_E_NOAGGREGATION;
 651
 652     lpac = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IAutoCompleteImpl));
 653     if (!lpac)
 654         return E_OUTOFMEMORY;
 655
 656     lpac->ref = 1;
 657     lpac->IAutoComplete2_iface.lpVtbl = &acvt;
 658     lpac->IAutoCompleteDropDown_iface.lpVtbl = &acdropdownvt;
 659     lpac->enabled = TRUE;
 660     lpac->options = ACO_AUTOAPPEND;
 661
 662     hr = IAutoComplete2_QueryInterface(&lpac->IAutoComplete2_iface, riid, ppv);
 663     IAutoComplete2_Release(&lpac->IAutoComplete2_iface);
 664
 665     TRACE("-- (%p)->\n",lpac);
 666
 667     return hr;
 668 }