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
  35  */
  36 #include "config.h"
  37
  38 #include <stdarg.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #define COBJMACROS
  43
  44 #include "wine/debug.h"
  45 #include "windef.h"
  46 #include "winbase.h"
  47 #include "winreg.h"
  48 #include "undocshell.h"
  49 #include "shlwapi.h"
  50 #include "winerror.h"
  51 #include "objbase.h"
  52
  53 #include "pidl.h"
  54 #include "shlobj.h"
  55 #include "shldisp.h"
  56 #include "debughlp.h"
  57
  58 #include "wine/unicode.h"
  59
  60 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  61
  62 typedef struct
  63 {
  64     const IAutoCompleteVtbl  *lpVtbl;
  65     const IAutoComplete2Vtbl *lpvtblAutoComplete2;
  66     LONG ref;
  67     BOOL  enabled;
  68     HWND hwndEdit;
  69     HWND hwndListBox;
  70     WNDPROC wpOrigEditProc;
  71     WNDPROC wpOrigLBoxProc;
  72     WCHAR *txtbackup;
  73     WCHAR *quickComplete;
  74     IEnumString *enumstr;
  75     AUTOCOMPLETEOPTIONS options;
  76 } IAutoCompleteImpl;
  77
  78 static const IAutoCompleteVtbl acvt;
  79 static const IAutoComplete2Vtbl ac2vt;
  80
  81 static inline IAutoCompleteImpl *impl_from_IAutoComplete2( IAutoComplete2 *iface )
  82 {
  83     return (IAutoCompleteImpl *)((char*)iface - FIELD_OFFSET(IAutoCompleteImpl, lpvtblAutoComplete2));
  84 }
  85
  86
  87 /*
  88   converts This to an interface pointer
  89 */
  90 #define _IUnknown_(This) (IUnknown*)&(This->lpVtbl)
  91 #define _IAutoComplete2_(This)  (IAutoComplete2*)&(This->lpvtblAutoComplete2)
  92
  93 static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
  94 static LRESULT APIENTRY ACLBoxSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
  95
  96 /**************************************************************************
  97  *  IAutoComplete_Constructor
  98  */
  99 HRESULT WINAPI IAutoComplete_Constructor(IUnknown * pUnkOuter, REFIID riid, LPVOID * ppv)
 100 {
 101     IAutoCompleteImpl *lpac;
 102
 103     if (pUnkOuter && !IsEqualIID (riid, &IID_IUnknown))
 104         return CLASS_E_NOAGGREGATION;
 105
 106     lpac = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IAutoCompleteImpl));
 107     if (!lpac)
 108         return E_OUTOFMEMORY;
 109
 110     lpac->ref = 1;
 111     lpac->lpVtbl = &acvt;
 112     lpac->lpvtblAutoComplete2 = &ac2vt;
 113     lpac->enabled = TRUE;
 114     lpac->enumstr = NULL;
 115     lpac->options = ACO_AUTOAPPEND;
 116     lpac->wpOrigEditProc = NULL;
 117     lpac->hwndListBox = NULL;
 118     lpac->txtbackup = NULL;
 119     lpac->quickComplete = NULL;
 120
 121     if (!SUCCEEDED (IUnknown_QueryInterface (_IUnknown_ (lpac), riid, ppv))) {
 122         IUnknown_Release (_IUnknown_ (lpac));
 123         return E_NOINTERFACE;
 124     }
 125
 126     TRACE("-- (%p)->\n",lpac);
 127
 128     return S_OK;
 129 }
 130
 131 /**************************************************************************
 132  *  AutoComplete_QueryInterface
 133  */
 134 static HRESULT WINAPI IAutoComplete_fnQueryInterface(
 135     IAutoComplete * iface,
 136     REFIID riid,
 137     LPVOID *ppvObj)
 138 {
 139     IAutoCompleteImpl *This = (IAutoCompleteImpl *)iface;
 140
 141     TRACE("(%p)->(\n\tIID:\t%s,%p)\n", This, shdebugstr_guid(riid), ppvObj);
 142     *ppvObj = NULL;
 143
 144     if(IsEqualIID(riid, &IID_IUnknown))
 145     {
 146         *ppvObj = This;
 147     }
 148     else if(IsEqualIID(riid, &IID_IAutoComplete))
 149     {
 150         *ppvObj = (IAutoComplete*)This;
 151     }
 152     else if(IsEqualIID(riid, &IID_IAutoComplete2))
 153     {
 154         *ppvObj = _IAutoComplete2_ (This);
 155     }
 156
 157     if (*ppvObj)
 158     {
 159         IAutoComplete_AddRef((IAutoComplete*)*ppvObj);
 160         TRACE("-- Interface: (%p)->(%p)\n", ppvObj, *ppvObj);
 161         return S_OK;
 162     }
 163     TRACE("-- Interface: E_NOINTERFACE\n");
 164     return E_NOINTERFACE;
 165 }
 166
 167 /******************************************************************************
 168  * IAutoComplete_fnAddRef
 169  */
 170 static ULONG WINAPI IAutoComplete_fnAddRef(
 171         IAutoComplete * iface)
 172 {
 173     IAutoCompleteImpl *This = (IAutoCompleteImpl *)iface;
 174     ULONG refCount = InterlockedIncrement(&This->ref);
 175
 176     TRACE("(%p)->(%u)\n", This, refCount - 1);
 177
 178     return refCount;
 179 }
 180
 181 /******************************************************************************
 182  * IAutoComplete_fnRelease
 183  */
 184 static ULONG WINAPI IAutoComplete_fnRelease(
 185         IAutoComplete * iface)
 186 {
 187     IAutoCompleteImpl *This = (IAutoCompleteImpl *)iface;
 188     ULONG refCount = InterlockedDecrement(&This->ref);
 189
 190     TRACE("(%p)->(%u)\n", This, refCount + 1);
 191
 192     if (!refCount) {
 193         TRACE(" destroying IAutoComplete(%p)\n",This);
 194         HeapFree(GetProcessHeap(), 0, This->quickComplete);
 195         HeapFree(GetProcessHeap(), 0, This->txtbackup);
 196         if (This->hwndListBox)
 197             DestroyWindow(This->hwndListBox);
 198         if (This->enumstr)
 199             IEnumString_Release(This->enumstr);
 200         HeapFree(GetProcessHeap(), 0, This);
 201     }
 202     return refCount;
 203 }
 204
 205 /******************************************************************************
 206  * IAutoComplete_fnEnable
 207  */
 208 static HRESULT WINAPI IAutoComplete_fnEnable(
 209     IAutoComplete * iface,
 210     BOOL fEnable)
 211 {
 212     IAutoCompleteImpl *This = (IAutoCompleteImpl *)iface;
 213
 214     HRESULT hr = S_OK;
 215
 216     TRACE("(%p)->(%s)\n", This, (fEnable)?"true":"false");
 217
 218     This->enabled = fEnable;
 219
 220     return hr;
 221 }
 222
 223 /******************************************************************************
 224  * IAutoComplete_fnInit
 225  */
 226 static HRESULT WINAPI IAutoComplete_fnInit(
 227     IAutoComplete * iface,
 228     HWND hwndEdit,
 229     IUnknown *punkACL,
 230     LPCOLESTR pwzsRegKeyPath,
 231     LPCOLESTR pwszQuickComplete)
 232 {
 233     IAutoCompleteImpl *This = (IAutoCompleteImpl *)iface;
 234     static const WCHAR lbName[] = {'L','i','s','t','B','o','x',0};
 235
 236     TRACE("(%p)->(0x%08lx, %p, %s, %s)\n",
 237           This, (long)hwndEdit, punkACL, debugstr_w(pwzsRegKeyPath), debugstr_w(pwszQuickComplete));
 238
 239     if (This->options & ACO_AUTOSUGGEST) TRACE(" ACO_AUTOSUGGEST\n");
 240     if (This->options & ACO_AUTOAPPEND) TRACE(" ACO_AUTOAPPEND\n");
 241     if (This->options & ACO_SEARCH) FIXME(" ACO_SEARCH not supported\n");
 242     if (This->options & ACO_FILTERPREFIXES) FIXME(" ACO_FILTERPREFIXES not supported\n");
 243     if (This->options & ACO_USETAB) FIXME(" ACO_USETAB not supported\n");
 244     if (This->options & ACO_UPDOWNKEYDROPSLIST) TRACE(" ACO_UPDOWNKEYDROPSLIST\n");
 245     if (This->options & ACO_RTLREADING) FIXME(" ACO_RTLREADING not supported\n");
 246
 247     This->hwndEdit = hwndEdit;
 248
 249     if (!SUCCEEDED (IUnknown_QueryInterface (punkACL, &IID_IEnumString, (LPVOID*)&This->enumstr))) {
 250         TRACE("No IEnumString interface\n");
 251         return  E_NOINTERFACE;
 252     }
 253
 254     This->wpOrigEditProc = (WNDPROC) SetWindowLongPtrW( hwndEdit, GWLP_WNDPROC, (LONG_PTR) ACEditSubclassProc);
 255     SetWindowLongPtrW( hwndEdit, GWLP_USERDATA, (LONG_PTR)This);
 256
 257     if (This->options & ACO_AUTOSUGGEST) {
 258         HWND hwndParent;
 259
 260         hwndParent = GetParent(This->hwndEdit);
 261
 262         /* FIXME : The listbox should be resizable with the mouse. WS_THICKFRAME looks ugly */
 263         This->hwndListBox = CreateWindowExW(0, lbName, NULL,
 264                                             WS_BORDER | WS_CHILD | WS_VSCROLL | LBS_HASSTRINGS | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT,
 265                                             CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
 266                                             hwndParent, NULL,
 267                                             (HINSTANCE)GetWindowLongPtrW( hwndParent, GWLP_HINSTANCE ), NULL);
 268
 269         if (This->hwndListBox) {
 270             This->wpOrigLBoxProc = (WNDPROC) SetWindowLongPtrW( This->hwndListBox, GWLP_WNDPROC, (LONG_PTR) ACLBoxSubclassProc);
 271             SetWindowLongPtrW( This->hwndListBox, GWLP_USERDATA, (LONG_PTR)This);
 272         }
 273     }
 274
 275     if (pwzsRegKeyPath) {
 276         WCHAR *key;
 277         WCHAR result[MAX_PATH];
 278         WCHAR *value;
 279         HKEY hKey = 0;
 280         LONG res;
 281         LONG len;
 282
 283         /* pwszRegKeyPath contains the key as well as the value, so we split */
 284         key = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (lstrlenW(pwzsRegKeyPath)+1)*sizeof(WCHAR));
 285         strcpyW(key, pwzsRegKeyPath);
 286         value = strrchrW(key, '\\');
 287         *value = 0;
 288         value++;
 289         /* Now value contains the value and buffer the key */
 290         res = RegOpenKeyExW(HKEY_CURRENT_USER, key, 0, KEY_READ, &hKey);
 291         if (res != ERROR_SUCCESS) {
 292             /* if the key is not found, MSDN states we must seek in HKEY_LOCAL_MACHINE */
 293             res = RegOpenKeyExW(HKEY_LOCAL_MACHINE, key, 0, KEY_READ, &hKey);
 294         }
 295         if (res == ERROR_SUCCESS) {
 296             res = RegQueryValueW(hKey, value, result, &len);
 297             if (res == ERROR_SUCCESS) {
 298                 This->quickComplete = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, len*sizeof(WCHAR));
 299                 strcpyW(This->quickComplete, result);
 300             }
 301             RegCloseKey(hKey);
 302         }
 303         HeapFree(GetProcessHeap(), 0, key);
 304     }
 305
 306     if ((pwszQuickComplete) && (!This->quickComplete)) {
 307         This->quickComplete = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (lstrlenW(pwszQuickComplete)+1)*sizeof(WCHAR));
 308         lstrcpyW(This->quickComplete, pwszQuickComplete);
 309     }
 310
 311     return S_OK;
 312 }
 313
 314 /**************************************************************************
 315  *  IAutoComplete_fnVTable
 316  */
 317 static const IAutoCompleteVtbl acvt =
 318 {
 319     IAutoComplete_fnQueryInterface,
 320     IAutoComplete_fnAddRef,
 321     IAutoComplete_fnRelease,
 322     IAutoComplete_fnInit,
 323     IAutoComplete_fnEnable,
 324 };
 325
 326 /**************************************************************************
 327  *  AutoComplete2_QueryInterface
 328  */
 329 static HRESULT WINAPI IAutoComplete2_fnQueryInterface(
 330     IAutoComplete2 * iface,
 331     REFIID riid,
 332     LPVOID *ppvObj)
 333 {
 334     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 335
 336     TRACE ("(%p)->(%s,%p)\n", This, shdebugstr_guid (riid), ppvObj);
 337
 338     return IAutoComplete_QueryInterface((IAutoComplete*)This, riid, ppvObj);
 339 }
 340
 341 /******************************************************************************
 342  * IAutoComplete2_fnAddRef
 343  */
 344 static ULONG WINAPI IAutoComplete2_fnAddRef(
 345         IAutoComplete2 * iface)
 346 {
 347     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 348
 349     TRACE ("(%p)->(count=%u)\n", This, This->ref);
 350
 351     return IAutoComplete2_AddRef((IAutoComplete*)This);
 352 }
 353
 354 /******************************************************************************
 355  * IAutoComplete2_fnRelease
 356  */
 357 static ULONG WINAPI IAutoComplete2_fnRelease(
 358         IAutoComplete2 * iface)
 359 {
 360     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 361
 362     TRACE ("(%p)->(count=%u)\n", This, This->ref);
 363
 364     return IAutoComplete_Release((IAutoComplete*)This);
 365 }
 366
 367 /******************************************************************************
 368  * IAutoComplete2_fnEnable
 369  */
 370 static HRESULT WINAPI IAutoComplete2_fnEnable(
 371     IAutoComplete2 * iface,
 372     BOOL fEnable)
 373 {
 374     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 375
 376     TRACE ("(%p)->(%s)\n", This, (fEnable)?"true":"false");
 377
 378     return IAutoComplete_Enable((IAutoComplete*)This, fEnable);
 379 }
 380
 381 /******************************************************************************
 382  * IAutoComplete2_fnInit
 383  */
 384 static HRESULT WINAPI IAutoComplete2_fnInit(
 385     IAutoComplete2 * iface,
 386     HWND hwndEdit,
 387     IUnknown *punkACL,
 388     LPCOLESTR pwzsRegKeyPath,
 389     LPCOLESTR pwszQuickComplete)
 390 {
 391     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 392
 393     TRACE("(%p)\n", This);
 394
 395     return IAutoComplete_Init((IAutoComplete*)This, hwndEdit, punkACL, pwzsRegKeyPath, pwszQuickComplete);
 396 }
 397
 398 /**************************************************************************
 399  *  IAutoComplete_fnGetOptions
 400  */
 401 static HRESULT WINAPI IAutoComplete2_fnGetOptions(
 402     IAutoComplete2 * iface,
 403     DWORD *pdwFlag)
 404 {
 405     HRESULT hr = S_OK;
 406
 407     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 408
 409     TRACE("(%p) -> (%p)\n", This, pdwFlag);
 410
 411     *pdwFlag = This->options;
 412
 413     return hr;
 414 }
 415
 416 /**************************************************************************
 417  *  IAutoComplete_fnSetOptions
 418  */
 419 static HRESULT WINAPI IAutoComplete2_fnSetOptions(
 420     IAutoComplete2 * iface,
 421     DWORD dwFlag)
 422 {
 423     HRESULT hr = S_OK;
 424
 425     IAutoCompleteImpl *This = impl_from_IAutoComplete2(iface);
 426
 427     TRACE("(%p) -> (0x%x)\n", This, dwFlag);
 428
 429     This->options = dwFlag;
 430
 431     return hr;
 432 }
 433
 434 /**************************************************************************
 435  *  IAutoComplete2_fnVTable
 436  */
 437 static const IAutoComplete2Vtbl ac2vt =
 438 {
 439     IAutoComplete2_fnQueryInterface,
 440     IAutoComplete2_fnAddRef,
 441     IAutoComplete2_fnRelease,
 442     IAutoComplete2_fnInit,
 443     IAutoComplete2_fnEnable,
 444     /* IAutoComplete2 */
 445     IAutoComplete2_fnSetOptions,
 446     IAutoComplete2_fnGetOptions,
 447 };
 448
 449 /*
 450   Window procedure for autocompletion
 451  */
 452 static LRESULT APIENTRY ACEditSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 453 {
 454     IAutoCompleteImpl *This = (IAutoCompleteImpl *)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 455     LPOLESTR strs;
 456     HRESULT hr;
 457     WCHAR hwndText[255];
 458     WCHAR *hwndQCText;
 459     RECT r;
 460     BOOL control, filled, displayall = FALSE;
 461     int cpt, height, sel;
 462
 463     if (!This->enabled) return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 464
 465     switch (uMsg)
 466     {
 467         case CB_SHOWDROPDOWN:
 468             ShowWindow(This->hwndListBox, SW_HIDE);
 469             break;
 470         case WM_KILLFOCUS:
 471             if ((This->options && ACO_AUTOSUGGEST) &&
 472                 ((HWND)wParam != This->hwndListBox))
 473             {
 474                 ShowWindow(This->hwndListBox, SW_HIDE);
 475             }
 476             break;
 477         case WM_KEYUP:
 478
 479             GetWindowTextW( hwnd, (LPWSTR)hwndText, 255);
 480
 481             switch(wParam) {
 482                 case VK_RETURN:
 483                     /* If quickComplete is set and control is pressed, replace the string */
 484                     control = GetKeyState(VK_CONTROL) & 0x8000;
 485                     if (control && This->quickComplete) {
 486                         hwndQCText = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 487                                                        (lstrlenW(This->quickComplete)+lstrlenW(hwndText))*sizeof(WCHAR));
 488                         sel = sprintfW(hwndQCText, This->quickComplete, hwndText);
 489                         SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)hwndQCText);
 490                         SendMessageW(hwnd, EM_SETSEL, 0, sel);
 491                         HeapFree(GetProcessHeap(), 0, hwndQCText);
 492                     }
 493
 494                     ShowWindow(This->hwndListBox, SW_HIDE);
 495                     return 0;
 496                 case VK_LEFT:
 497                 case VK_RIGHT:
 498                     return 0;
 499                 case VK_UP:
 500                 case VK_DOWN:
 501                     /* Two cases here :
 502                        - if the listbox is not visible, displays it
 503                        with all the entries if the style ACO_UPDOWNKEYDROPSLIST
 504                        is present but does not select anything.
 505                        - if the listbox is visible, change the selection
 506                     */
 507                     if ( (This->options & (ACO_AUTOSUGGEST | ACO_UPDOWNKEYDROPSLIST))
 508                          && (!IsWindowVisible(This->hwndListBox) && (! *hwndText)) )
 509                     {
 510                          /* We must dispays all the entries */
 511                          displayall = TRUE;
 512                     } else {
 513                         if (IsWindowVisible(This->hwndListBox)) {
 514                             int count;
 515
 516                             count = SendMessageW(This->hwndListBox, LB_GETCOUNT, 0, 0);
 517                             /* Change the selection */
 518                             sel = SendMessageW(This->hwndListBox, LB_GETCURSEL, 0, 0);
 519                             if (wParam == VK_UP)
 520                                 sel = ((sel-1)<0)?count-1:sel-1;
 521                             else
 522                                 sel = ((sel+1)>= count)?-1:sel+1;
 523                             SendMessageW(This->hwndListBox, LB_SETCURSEL, sel, 0);
 524                             if (sel != -1) {
 525                                 WCHAR *msg;
 526                                 int len;
 527
 528                                 len = SendMessageW(This->hwndListBox, LB_GETTEXTLEN, sel, (LPARAM)NULL);
 529                                 msg = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (len+1)*sizeof(WCHAR));
 530                                 SendMessageW(This->hwndListBox, LB_GETTEXT, sel, (LPARAM)msg);
 531                                 SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)msg);
 532                                 SendMessageW(hwnd, EM_SETSEL, lstrlenW(msg), lstrlenW(msg));
 533                                 HeapFree(GetProcessHeap(), 0, msg);
 534                             } else {
 535                                 SendMessageW(hwnd, WM_SETTEXT, 0, (LPARAM)This->txtbackup);
 536                                 SendMessageW(hwnd, EM_SETSEL, lstrlenW(This->txtbackup), lstrlenW(This->txtbackup));
 537                             }
 538                         }
 539                         return 0;
 540                     }
 541                     break;
 542                 case VK_BACK:
 543                 case VK_DELETE:
 544                     if ((! *hwndText) && (This->options & ACO_AUTOSUGGEST)) {
 545                         ShowWindow(This->hwndListBox, SW_HIDE);
 546                         return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 547                     }
 548                     if (This->options & ACO_AUTOAPPEND) {
 549                         DWORD b;
 550                         SendMessageW(hwnd, EM_GETSEL, (WPARAM)&b, (LPARAM)NULL);
 551                         if (b>1) {
 552                             hwndText[b-1] = '\0';
 553                         } else {
 554                             hwndText[0] = '\0';
 555                             SetWindowTextW(hwnd, hwndText);
 556                         }
 557                     }
 558                     break;
 559                 default:
 560                     ;
 561             }
 562
 563             SendMessageW(This->hwndListBox, LB_RESETCONTENT, 0, 0);
 564
 565             HeapFree(GetProcessHeap(), 0, This->txtbackup);
 566             This->txtbackup = HeapAlloc(GetProcessHeap(),
 567                                                  HEAP_ZERO_MEMORY, (lstrlenW(hwndText)+1)*sizeof(WCHAR));
 568             lstrcpyW(This->txtbackup, hwndText);
 569
 570             /* Returns if there is no text to search and we doesn't want to display all the entries */
 571             if ((!displayall) && (! *hwndText) )
 572                 break;
 573
 574             IEnumString_Reset(This->enumstr);
 575             filled = FALSE;
 576             for(cpt = 0;;) {
 577                 hr = IEnumString_Next(This->enumstr, 1, &strs, NULL);
 578                 if (hr != S_OK)
 579                     break;
 580
 581                 if ((LPWSTR)strstrW(strs, hwndText) == strs) {
 582
 583                     if (This->options & ACO_AUTOAPPEND) {
 584                         SetWindowTextW(hwnd, strs);
 585                         SendMessageW(hwnd, EM_SETSEL, lstrlenW(hwndText), lstrlenW(strs));
 586                         break;
 587                     }
 588
 589                     if (This->options & ACO_AUTOSUGGEST) {
 590                         SendMessageW(This->hwndListBox, LB_ADDSTRING, 0, (LPARAM)strs);
 591                         filled = TRUE;
 592                         cpt++;
 593                     }
 594                 }
 595             }
 596
 597             if (This->options & ACO_AUTOSUGGEST) {
 598                 if (filled) {
 599                     height = SendMessageW(This->hwndListBox, LB_GETITEMHEIGHT, 0, 0);
 600                     SendMessageW(This->hwndListBox, LB_CARETOFF, 0, 0);
 601                     GetWindowRect(hwnd, &r);
 602                     SetParent(This->hwndListBox, HWND_DESKTOP);
 603                     /* It seems that Windows XP displays 7 lines at most
 604                        and otherwise displays a vertical scroll bar */
 605                     SetWindowPos(This->hwndListBox, HWND_TOP,
 606                                  r.left, r.bottom + 1, r.right - r.left, min(height * 7, height*(cpt+1)),
 607                                  SWP_SHOWWINDOW );
 608                 } else {
 609                     ShowWindow(This->hwndListBox, SW_HIDE);
 610                 }
 611             }
 612
 613             break;
 614         default:
 615             return CallWindowProcW(This->wpOrigEditProc, hwnd, uMsg, wParam, lParam);
 616
 617     }
 618
 619     return 0;
 620 }
 621
 622 static LRESULT APIENTRY ACLBoxSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 623 {
 624     IAutoCompleteImpl *This = (IAutoCompleteImpl *)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
 625     WCHAR *msg;
 626     int sel, len;
 627
 628     switch (uMsg) {
 629         case WM_MOUSEMOVE:
 630             sel = SendMessageW(hwnd, LB_ITEMFROMPOINT, 0, lParam);
 631             SendMessageW(hwnd, LB_SETCURSEL, (WPARAM)sel, (LPARAM)0);
 632             break;
 633         case WM_LBUTTONDOWN:
 634             sel = SendMessageW(hwnd, LB_GETCURSEL, 0, 0);
 635             if (sel < 0)
 636                 break;
 637             len = SendMessageW(This->hwndListBox, LB_GETTEXTLEN, sel, 0);
 638             msg = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (len+1)*sizeof(WCHAR));
 639             SendMessageW(hwnd, LB_GETTEXT, sel, (LPARAM)msg);
 640             SendMessageW(This->hwndEdit, WM_SETTEXT, 0, (LPARAM)msg);
 641             SendMessageW(This->hwndEdit, EM_SETSEL, 0, lstrlenW(msg));
 642             ShowWindow(hwnd, SW_HIDE);
 643             HeapFree(GetProcessHeap(), 0, msg);
 644             break;
 645         default:
 646             return CallWindowProcW(This->wpOrigLBoxProc, hwnd, uMsg, wParam, lParam);
 647     }
 648     return 0;
 649 }