dlls/user32/clipboard.c

   1 /*
   2  * WIN32 clipboard implementation
   3  *
   4  * Copyright 1994 Martin Ayotte
   5  *           1996 Alex Korobka
   6  *           1999 Noel Borthwick
   7  *           2003 Ulrich Czekalla for CodeWeavers
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  *
  23  * NOTES:
  24  *    This file contains the implementation for the WIN32 Clipboard API
  25  * and Wine's internal clipboard cache.
  26  * The actual contents of the clipboard are held in the clipboard cache.
  27  * The internal implementation talks to a "clipboard driver" to fill or
  28  * expose the cache to the native device. (Currently only the X11 and
  29  * TTY clipboard  driver are available)
  30  */
  31
  32 #include "config.h"
  33 #include "wine/port.h"
  34
  35 #include <stdarg.h>
  36 #include <stdlib.h>
  37 #include <sys/types.h>
  38 #include <fcntl.h>
  39 #ifdef HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42 #include <string.h>
  43
  44 #include "windef.h"
  45 #include "winbase.h"
  46 #include "wingdi.h"
  47 #include "winuser.h"
  48 #include "winerror.h"
  49 #include "user_private.h"
  50 #include "win.h"
  51
  52 #include "wine/debug.h"
  53 #include "wine/unicode.h"
  54 #include "wine/server.h"
  55
  56 WINE_DEFAULT_DEBUG_CHANNEL(clipboard);
  57
  58 #define  CF_REGFORMATBASE  0xC000
  59
  60 typedef struct
  61 {
  62     HWND hWndOpen;
  63     HWND hWndOwner;
  64     HWND hWndViewer;
  65     UINT seqno;
  66     UINT flags;
  67 } CLIPBOARDINFO, *LPCLIPBOARDINFO;
  68
  69 /*
  70  * Indicates if data has changed since open.
  71  */
  72 static BOOL bCBHasChanged = FALSE;
  73
  74
  75 /**************************************************************************
  76  *                      CLIPBOARD_SetClipboardOwner
  77  *
  78  * Set the global wineserver clipboard owner. The current process will
  79  * be the owner and <hWnd> will get the render notifications.
  80  */
  81 static BOOL CLIPBOARD_SetClipboardOwner(HWND hWnd)
  82 {
  83     BOOL bRet;
  84
  85     TRACE(" hWnd(%p)\n", hWnd);
  86
  87     SERVER_START_REQ( set_clipboard_info )
  88     {
  89         req->flags = SET_CB_OWNER;
  90         req->owner = wine_server_user_handle( hWnd );
  91         bRet = !wine_server_call_err( req );
  92     }
  93     SERVER_END_REQ;
  94
  95     return bRet;
  96 }
  97
  98
  99 /**************************************************************************
 100  *                      CLIPBOARD_GetClipboardInfo
 101  */
 102 static BOOL CLIPBOARD_GetClipboardInfo(LPCLIPBOARDINFO cbInfo)
 103 {
 104     BOOL bRet;
 105
 106     SERVER_START_REQ( set_clipboard_info )
 107     {
 108         req->flags = 0;
 109
 110         if (((bRet = !wine_server_call_err( req ))))
 111         {
 112             cbInfo->hWndOpen = wine_server_ptr_handle( reply->old_clipboard );
 113             cbInfo->hWndOwner = wine_server_ptr_handle( reply->old_owner );
 114             cbInfo->hWndViewer = wine_server_ptr_handle( reply->old_viewer );
 115             cbInfo->seqno = reply->seqno;
 116             cbInfo->flags = reply->flags;
 117         }
 118     }
 119     SERVER_END_REQ;
 120
 121     return bRet;
 122 }
 123
 124
 125 /**************************************************************************
 126  *      CLIPBOARD_ReleaseOwner
 127  */
 128 BOOL CLIPBOARD_ReleaseOwner(void)
 129 {
 130     BOOL bRet = FALSE;
 131
 132     SERVER_START_REQ( set_clipboard_info )
 133     {
 134         req->flags = SET_CB_RELOWNER | SET_CB_SEQNO;
 135
 136         if (wine_server_call_err( req ))
 137         {
 138             ERR("Failed to set clipboard.\n");
 139         }
 140         else
 141         {
 142             bRet = TRUE;
 143         }
 144     }
 145     SERVER_END_REQ;
 146
 147     return bRet;
 148 }
 149
 150
 151 /**************************************************************************
 152  *              CLIPBOARD_OpenClipboard
 153  */
 154 static BOOL CLIPBOARD_OpenClipboard(HWND hWnd)
 155 {
 156     BOOL bRet;
 157
 158     SERVER_START_REQ( set_clipboard_info )
 159     {
 160         req->flags = SET_CB_OPEN;
 161         req->clipboard = wine_server_user_handle( hWnd );
 162         bRet = !wine_server_call( req );
 163     }
 164     SERVER_END_REQ;
 165
 166     return bRet;
 167 }
 168
 169
 170 /**************************************************************************
 171  *              CLIPBOARD_CloseClipboard
 172  */
 173 static BOOL CLIPBOARD_CloseClipboard(void)
 174 {
 175     BOOL bRet;
 176
 177     TRACE(" Changed=%d\n", bCBHasChanged);
 178
 179     SERVER_START_REQ( set_clipboard_info )
 180     {
 181         req->flags = SET_CB_CLOSE;
 182         if (bCBHasChanged) req->flags |= SET_CB_SEQNO;
 183         bRet = !wine_server_call_err( req );
 184     }
 185     SERVER_END_REQ;
 186
 187     return bRet;
 188 }
 189
 190 /**************************************************************************
 191  *              CLIPBOARD_SetClipboardViewer
 192  */
 193 static HWND CLIPBOARD_SetClipboardViewer( HWND hWnd )
 194 {
 195     HWND hwndPrev = 0;
 196
 197     SERVER_START_REQ( set_clipboard_info )
 198     {
 199         req->flags = SET_CB_VIEWER;
 200         req->viewer = wine_server_user_handle( hWnd );
 201         if (!wine_server_call_err( req ))
 202             hwndPrev = wine_server_ptr_handle( reply->old_viewer );
 203     }
 204     SERVER_END_REQ;
 205
 206     return hwndPrev;
 207 }
 208
 209 /**************************************************************************
 210  *                WIN32 Clipboard implementation
 211  **************************************************************************/
 212
 213 /**************************************************************************
 214  *              RegisterClipboardFormatW (USER32.@)
 215  */
 216 UINT WINAPI RegisterClipboardFormatW( LPCWSTR name )
 217 {
 218     return GlobalAddAtomW( name );
 219 }
 220
 221
 222 /**************************************************************************
 223  *              RegisterClipboardFormatA (USER32.@)
 224  */
 225 UINT WINAPI RegisterClipboardFormatA( LPCSTR name )
 226 {
 227     return GlobalAddAtomA( name );
 228 }
 229
 230
 231 /**************************************************************************
 232  *              GetClipboardFormatNameW (USER32.@)
 233  */
 234 INT WINAPI GetClipboardFormatNameW(UINT wFormat, LPWSTR retStr, INT maxlen)
 235 {
 236     if (wFormat < MAXINTATOM) return 0;
 237     return GlobalGetAtomNameW( wFormat, retStr, maxlen );
 238 }
 239
 240
 241 /**************************************************************************
 242  *              GetClipboardFormatNameA (USER32.@)
 243  */
 244 INT WINAPI GetClipboardFormatNameA(UINT wFormat, LPSTR retStr, INT maxlen)
 245 {
 246     if (wFormat < MAXINTATOM) return 0;
 247     return GlobalGetAtomNameA( wFormat, retStr, maxlen );
 248 }
 249
 250
 251 /**************************************************************************
 252  *              OpenClipboard (USER32.@)
 253  *
 254  * Note: Netscape uses NULL hWnd to open the clipboard.
 255  */
 256 BOOL WINAPI OpenClipboard( HWND hWnd )
 257 {
 258     BOOL bRet;
 259
 260     TRACE("(%p)...\n", hWnd);
 261
 262     bRet = CLIPBOARD_OpenClipboard(hWnd);
 263
 264     TRACE(" returning %i\n", bRet);
 265
 266     return bRet;
 267 }
 268
 269
 270 /**************************************************************************
 271  *              CloseClipboard (USER32.@)
 272  */
 273 BOOL WINAPI CloseClipboard(void)
 274 {
 275     BOOL bRet = FALSE;
 276
 277     TRACE("() Changed=%d\n", bCBHasChanged);
 278
 279     if (CLIPBOARD_CloseClipboard())
 280     {
 281         if (bCBHasChanged)
 282         {
 283             HWND hWndViewer = GetClipboardViewer();
 284
 285             USER_Driver->pEndClipboardUpdate();
 286
 287             bCBHasChanged = FALSE;
 288
 289             if (hWndViewer)
 290                 SendMessageW(hWndViewer, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
 291         }
 292
 293         bRet = TRUE;
 294     }
 295
 296     return bRet;
 297 }
 298
 299
 300 /**************************************************************************
 301  *              EmptyClipboard (USER32.@)
 302  * Empties and acquires ownership of the clipboard
 303  */
 304 BOOL WINAPI EmptyClipboard(void)
 305 {
 306     CLIPBOARDINFO cbinfo;
 307
 308     TRACE("()\n");
 309
 310     if (!CLIPBOARD_GetClipboardInfo(&cbinfo) ||
 311         ~cbinfo.flags & CB_OPEN)
 312     {
 313         WARN("Clipboard not opened by calling task!\n");
 314         SetLastError(ERROR_CLIPBOARD_NOT_OPEN);
 315         return FALSE;
 316     }
 317
 318     /* Destroy private objects */
 319     if (cbinfo.hWndOwner)
 320         SendMessageW(cbinfo.hWndOwner, WM_DESTROYCLIPBOARD, 0, 0);
 321
 322     /* Tell the driver to acquire the selection. The current owner
 323      * will be signaled to delete it's own cache. */
 324
 325     /* Assign ownership of the clipboard to the current client. We do
 326      * this before acquiring the selection so that when we do acquire the
 327      * selection and the selection loser gets notified, it can check if
 328      * it has lost the Wine clipboard ownership. If it did then it knows
 329      * that a WM_DESTORYCLIPBOARD has already been sent. Otherwise it
 330      * lost the selection to a X app and it should send the
 331      * WM_DESTROYCLIPBOARD itself. */
 332     CLIPBOARD_SetClipboardOwner(cbinfo.hWndOpen);
 333
 334     /* Acquire the selection. This will notify the previous owner
 335      * to clear it's cache. */
 336     USER_Driver->pAcquireClipboard(cbinfo.hWndOpen);
 337
 338     /* Empty the local cache */
 339     USER_Driver->pEmptyClipboard(FALSE);
 340
 341     bCBHasChanged = TRUE;
 342
 343     return TRUE;
 344 }
 345
 346
 347 /**************************************************************************
 348  *              GetClipboardOwner (USER32.@)
 349  *  FIXME: Can't return the owner if the clipboard is owned by an external X-app
 350  */
 351 HWND WINAPI GetClipboardOwner(void)
 352 {
 353     HWND hWndOwner = 0;
 354
 355     SERVER_START_REQ( set_clipboard_info )
 356     {
 357         req->flags = 0;
 358         if (!wine_server_call_err( req )) hWndOwner = wine_server_ptr_handle( reply->old_owner );
 359     }
 360     SERVER_END_REQ;
 361
 362     TRACE(" hWndOwner(%p)\n", hWndOwner);
 363
 364     return hWndOwner;
 365 }
 366
 367
 368 /**************************************************************************
 369  *              GetOpenClipboardWindow (USER32.@)
 370  */
 371 HWND WINAPI GetOpenClipboardWindow(void)
 372 {
 373     HWND hWndOpen = 0;
 374
 375     SERVER_START_REQ( set_clipboard_info )
 376     {
 377         req->flags = 0;
 378         if (!wine_server_call_err( req )) hWndOpen = wine_server_ptr_handle( reply->old_clipboard );
 379     }
 380     SERVER_END_REQ;
 381
 382     TRACE(" hWndClipWindow(%p)\n", hWndOpen);
 383
 384     return hWndOpen;
 385 }
 386
 387
 388 /**************************************************************************
 389  *              SetClipboardViewer (USER32.@)
 390  */
 391 HWND WINAPI SetClipboardViewer( HWND hWnd )
 392 {
 393     HWND hwndPrev = CLIPBOARD_SetClipboardViewer(hWnd);
 394
 395     if (hWnd)
 396         SendMessageW(hWnd, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
 397     TRACE("(%p): returning %p\n", hWnd, hwndPrev);
 398
 399     return hwndPrev;
 400 }
 401
 402
 403 /**************************************************************************
 404  *              GetClipboardViewer (USER32.@)
 405  */
 406 HWND WINAPI GetClipboardViewer(void)
 407 {
 408     HWND hWndViewer = 0;
 409
 410     SERVER_START_REQ( set_clipboard_info )
 411     {
 412         req->flags = 0;
 413         if (!wine_server_call_err( req )) hWndViewer = wine_server_ptr_handle( reply->old_viewer );
 414     }
 415     SERVER_END_REQ;
 416
 417     TRACE(" hWndViewer=%p\n", hWndViewer);
 418
 419     return hWndViewer;
 420 }
 421
 422
 423 /**************************************************************************
 424  *              ChangeClipboardChain (USER32.@)
 425  */
 426 BOOL WINAPI ChangeClipboardChain(HWND hWnd, HWND hWndNext)
 427 {
 428     BOOL bRet = TRUE;
 429     HWND hWndViewer = GetClipboardViewer();
 430
 431     if (hWndViewer)
 432     {
 433         if (WIN_GetFullHandle(hWnd) == hWndViewer)
 434             CLIPBOARD_SetClipboardViewer(WIN_GetFullHandle(hWndNext));
 435         else
 436             bRet = !SendMessageW(hWndViewer, WM_CHANGECBCHAIN, (WPARAM)hWnd, (LPARAM)hWndNext);
 437     }
 438     else
 439         ERR("hWndViewer is lost\n");
 440
 441     return bRet;
 442 }
 443
 444
 445 /**************************************************************************
 446  *              SetClipboardData (USER32.@)
 447  */
 448 HANDLE WINAPI SetClipboardData(UINT wFormat, HANDLE hData)
 449 {
 450     CLIPBOARDINFO cbinfo;
 451     HANDLE hResult = 0;
 452
 453     TRACE("(%04X, %p) !\n", wFormat, hData);
 454
 455     /* If it's not owned, data can only be set if the format isn't
 456        available and its rendering is not delayed */
 457     if (!CLIPBOARD_GetClipboardInfo(&cbinfo) ||
 458        (!(cbinfo.flags & CB_OWNER) && !hData))
 459     {
 460         WARN("Clipboard not owned by calling task. Operation failed.\n");
 461         return 0;
 462     }
 463
 464     if (USER_Driver->pSetClipboardData(wFormat, hData, cbinfo.flags & CB_OWNER))
 465     {
 466         hResult = hData;
 467         bCBHasChanged = TRUE;
 468     }
 469
 470     return hResult;
 471 }
 472
 473
 474 /**************************************************************************
 475  *              CountClipboardFormats (USER32.@)
 476  */
 477 INT WINAPI CountClipboardFormats(void)
 478 {
 479     INT count = USER_Driver->pCountClipboardFormats();
 480     TRACE("returning %d\n", count);
 481     return count;
 482 }
 483
 484
 485 /**************************************************************************
 486  *              EnumClipboardFormats (USER32.@)
 487  */
 488 UINT WINAPI EnumClipboardFormats(UINT wFormat)
 489 {
 490     CLIPBOARDINFO cbinfo;
 491
 492     TRACE("(%04X)\n", wFormat);
 493
 494     if (!CLIPBOARD_GetClipboardInfo(&cbinfo) ||
 495         (~cbinfo.flags & CB_OPEN))
 496     {
 497         WARN("Clipboard not opened by calling task.\n");
 498         SetLastError(ERROR_CLIPBOARD_NOT_OPEN);
 499         return 0;
 500     }
 501     return USER_Driver->pEnumClipboardFormats(wFormat);
 502 }
 503
 504
 505 /**************************************************************************
 506  *              IsClipboardFormatAvailable (USER32.@)
 507  */
 508 BOOL WINAPI IsClipboardFormatAvailable(UINT wFormat)
 509 {
 510     BOOL bret = USER_Driver->pIsClipboardFormatAvailable(wFormat);
 511     TRACE("%04x, returning %d\n", wFormat, bret);
 512     return bret;
 513 }
 514
 515
 516 /**************************************************************************
 517  *              GetClipboardData (USER32.@)
 518  */
 519 HANDLE WINAPI GetClipboardData(UINT wFormat)
 520 {
 521     HANDLE hData = 0;
 522     CLIPBOARDINFO cbinfo;
 523
 524     TRACE("%04x\n", wFormat);
 525
 526     if (!CLIPBOARD_GetClipboardInfo(&cbinfo) ||
 527         (~cbinfo.flags & CB_OPEN))
 528     {
 529         WARN("Clipboard not opened by calling task.\n");
 530         SetLastError(ERROR_CLIPBOARD_NOT_OPEN);
 531         return 0;
 532     }
 533
 534     hData = USER_Driver->pGetClipboardData( wFormat );
 535
 536     TRACE("returning %p\n", hData);
 537     return hData;
 538 }
 539
 540
 541 /**************************************************************************
 542  *              GetPriorityClipboardFormat (USER32.@)
 543  */
 544 INT WINAPI GetPriorityClipboardFormat(UINT *list, INT nCount)
 545 {
 546     int i;
 547
 548     TRACE("()\n");
 549
 550     if(CountClipboardFormats() == 0)
 551         return 0;
 552
 553     for (i = 0; i < nCount; i++)
 554         if (IsClipboardFormatAvailable(list[i]))
 555             return list[i];
 556
 557     return -1;
 558 }
 559
 560
 561 /**************************************************************************
 562  *              GetClipboardSequenceNumber (USER32.@)
 563  * Supported on Win2k/Win98
 564  * MSDN: Windows clipboard code keeps a serial number for the clipboard
 565  * for each window station.  The number is incremented whenever the
 566  * contents change or are emptied.
 567  * If you do not have WINSTA_ACCESSCLIPBOARD then the function returns 0
 568  */
 569 DWORD WINAPI GetClipboardSequenceNumber(VOID)
 570 {
 571     DWORD seqno = 0;
 572
 573     SERVER_START_REQ( set_clipboard_info )
 574     {
 575         req->flags = 0;
 576         if (!wine_server_call_err( req )) seqno = reply->seqno;
 577     }
 578     SERVER_END_REQ;
 579
 580     TRACE("returning %x\n", seqno);
 581     return seqno;
 582 }