dlls/winemac.drv/dragdrop.c

   1 /*
   2  * MACDRV Drag and drop code
   3  *
   4  * Copyright 2003 Ulrich Czekalla
   5  * Copyright 2007 Damjan Jovanovic
   6  * Copyright 2013 Ken Thomases for CodeWeavers Inc.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24
  25 #define NONAMELESSUNION
  26
  27 #include "macdrv.h"
  28
  29 #define COBJMACROS
  30 #include "objidl.h"
  31 #include "shellapi.h"
  32 #include "shlobj.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(dragdrop);
  35
  36
  37 static IDataObject *active_data_object;
  38 static HWND last_droptarget_hwnd;
  39
  40
  41 typedef struct
  42 {
  43     IDataObject IDataObject_iface;
  44     LONG        ref;
  45     CFTypeRef   pasteboard;
  46 } DragDropDataObject;
  47
  48
  49 static inline DragDropDataObject *impl_from_IDataObject(IDataObject *iface)
  50 {
  51     return CONTAINING_RECORD(iface, DragDropDataObject, IDataObject_iface);
  52 }
  53
  54
  55 static HRESULT WINAPI dddo_QueryInterface(IDataObject* iface, REFIID riid, LPVOID *ppvObj)
  56 {
  57     DragDropDataObject *This = impl_from_IDataObject(iface);
  58
  59     TRACE("(%p)->(%s,%p)\n", This, debugstr_guid(riid), ppvObj);
  60
  61     if (IsEqualIID(riid, &IID_IUnknown) || (IsEqualIID(riid, &IID_IDataObject)))
  62     {
  63         *ppvObj = This;
  64         IUnknown_AddRef((IUnknown*)This);
  65         return S_OK;
  66     }
  67
  68     *ppvObj = NULL;
  69     return E_NOINTERFACE;
  70 }
  71
  72
  73 static ULONG WINAPI dddo_AddRef(IDataObject* iface)
  74 {
  75     DragDropDataObject *This = impl_from_IDataObject(iface);
  76     ULONG refCount = InterlockedIncrement(&This->ref);
  77
  78     TRACE("(%p)->(count=%u)\n", This, refCount - 1);
  79
  80     return refCount;
  81 }
  82
  83
  84 static ULONG WINAPI dddo_Release(IDataObject* iface)
  85 {
  86     DragDropDataObject *This = impl_from_IDataObject(iface);
  87     ULONG refCount = InterlockedDecrement(&This->ref);
  88
  89     TRACE("(%p)->(count=%u)\n", This, refCount + 1);
  90     if (refCount)
  91         return refCount;
  92
  93     TRACE("-- destroying DragDropDataObject (%p)\n", This);
  94     CFRelease(This->pasteboard);
  95     HeapFree(GetProcessHeap(), 0, This);
  96     return 0;
  97 }
  98
  99
 100 static HRESULT WINAPI dddo_GetData(IDataObject* iface, FORMATETC* formatEtc, STGMEDIUM* medium)
 101 {
 102     DragDropDataObject *This = impl_from_IDataObject(iface);
 103     HRESULT hr;
 104
 105     TRACE("This %p formatEtc %s\n", This, debugstr_format(formatEtc->cfFormat));
 106
 107     hr = IDataObject_QueryGetData(iface, formatEtc);
 108     if (SUCCEEDED(hr))
 109     {
 110         medium->tymed = TYMED_HGLOBAL;
 111         medium->u.hGlobal = macdrv_get_pasteboard_data(This->pasteboard, formatEtc->cfFormat);
 112         medium->pUnkForRelease = NULL;
 113         hr = medium->u.hGlobal ? S_OK : E_OUTOFMEMORY;
 114     }
 115
 116     return hr;
 117 }
 118
 119
 120 static HRESULT WINAPI dddo_GetDataHere(IDataObject* iface, FORMATETC* formatEtc,
 121                                        STGMEDIUM* medium)
 122 {
 123     FIXME("iface %p formatEtc %p medium %p; stub\n", iface, formatEtc, medium);
 124     return DATA_E_FORMATETC;
 125 }
 126
 127
 128 static HRESULT WINAPI dddo_QueryGetData(IDataObject* iface, FORMATETC* formatEtc)
 129 {
 130     DragDropDataObject *This = impl_from_IDataObject(iface);
 131     HRESULT hr = DV_E_FORMATETC;
 132
 133     TRACE("This %p formatEtc %p={.tymed=0x%x, .dwAspect=%d, .cfFormat=%s}\n",
 134           This, formatEtc, formatEtc->tymed, formatEtc->dwAspect,
 135           debugstr_format(formatEtc->cfFormat));
 136
 137     if (formatEtc->tymed && !(formatEtc->tymed & TYMED_HGLOBAL))
 138     {
 139         FIXME("only HGLOBAL medium types supported right now\n");
 140         return DV_E_TYMED;
 141     }
 142     if (formatEtc->dwAspect != DVASPECT_CONTENT)
 143     {
 144         FIXME("only the content aspect is supported right now\n");
 145         return E_NOTIMPL;
 146     }
 147
 148     if (macdrv_pasteboard_has_format(This->pasteboard, formatEtc->cfFormat))
 149         hr = S_OK;
 150
 151     TRACE(" -> 0x%x\n", hr);
 152     return hr;
 153 }
 154
 155
 156 static HRESULT WINAPI dddo_GetConicalFormatEtc(IDataObject* iface, FORMATETC* formatEtc,
 157                                                FORMATETC* formatEtcOut)
 158 {
 159     DragDropDataObject *This = impl_from_IDataObject(iface);
 160
 161     TRACE("This %p formatEtc %p={.tymed=0x%x, .dwAspect=%d, .cfFormat=%s}\n",
 162           This, formatEtc, formatEtc->tymed, formatEtc->dwAspect,
 163           debugstr_format(formatEtc->cfFormat));
 164
 165     *formatEtcOut = *formatEtc;
 166     formatEtcOut->ptd = NULL;
 167     return DATA_S_SAMEFORMATETC;
 168 }
 169
 170
 171 static HRESULT WINAPI dddo_SetData(IDataObject* iface, FORMATETC* formatEtc,
 172                                    STGMEDIUM* medium, BOOL fRelease)
 173 {
 174     DragDropDataObject *This = impl_from_IDataObject(iface);
 175
 176     TRACE("This %p formatEtc %p={.tymed=0x%x, .dwAspect=%d, .cfFormat=%s} medium %p fRelease %d\n",
 177           This, formatEtc, formatEtc->tymed, formatEtc->dwAspect,
 178           debugstr_format(formatEtc->cfFormat), medium, fRelease);
 179
 180     return E_NOTIMPL;
 181 }
 182
 183
 184 static HRESULT WINAPI dddo_EnumFormatEtc(IDataObject* iface, DWORD direction,
 185                                          IEnumFORMATETC** enumFormatEtc)
 186 {
 187     DragDropDataObject *This = impl_from_IDataObject(iface);
 188     CFArrayRef formats;
 189     HRESULT hr;
 190
 191     TRACE("This %p direction %u enumFormatEtc %p\n", This, direction, enumFormatEtc);
 192
 193     if (direction != DATADIR_GET)
 194     {
 195         WARN("only the get direction is implemented\n");
 196         return E_NOTIMPL;
 197     }
 198
 199     formats = macdrv_copy_pasteboard_formats(This->pasteboard);
 200     if (formats)
 201     {
 202         INT count = CFArrayGetCount(formats);
 203         FORMATETC *formatEtcs = HeapAlloc(GetProcessHeap(), 0, count * sizeof(FORMATETC));
 204         if (formatEtcs)
 205         {
 206             INT i;
 207
 208             for (i = 0; i < count; i++)
 209             {
 210                 formatEtcs[i].cfFormat = (UINT)CFArrayGetValueAtIndex(formats, i);
 211                 formatEtcs[i].ptd = NULL;
 212                 formatEtcs[i].dwAspect = DVASPECT_CONTENT;
 213                 formatEtcs[i].lindex = -1;
 214                 formatEtcs[i].tymed = TYMED_HGLOBAL;
 215             }
 216
 217             hr = SHCreateStdEnumFmtEtc(count, formatEtcs, enumFormatEtc);
 218             HeapFree(GetProcessHeap(), 0, formatEtcs);
 219         }
 220         else
 221             hr = E_OUTOFMEMORY;
 222
 223         CFRelease(formats);
 224     }
 225     else
 226         hr = SHCreateStdEnumFmtEtc(0, NULL, enumFormatEtc);
 227
 228     TRACE(" -> 0x%x\n", hr);
 229     return hr;
 230 }
 231
 232
 233 static HRESULT WINAPI dddo_DAdvise(IDataObject* iface, FORMATETC* formatEtc, DWORD advf,
 234                                    IAdviseSink* pAdvSink, DWORD* pdwConnection)
 235 {
 236     FIXME("(%p, %p, %u, %p, %p): stub\n", iface, formatEtc, advf,
 237           pAdvSink, pdwConnection);
 238     return OLE_E_ADVISENOTSUPPORTED;
 239 }
 240
 241
 242 static HRESULT WINAPI dddo_DUnadvise(IDataObject* iface, DWORD dwConnection)
 243 {
 244     FIXME("(%p, %u): stub\n", iface, dwConnection);
 245     return OLE_E_ADVISENOTSUPPORTED;
 246 }
 247
 248
 249 static HRESULT WINAPI dddo_EnumDAdvise(IDataObject* iface, IEnumSTATDATA** pEnumAdvise)
 250 {
 251     FIXME("(%p, %p): stub\n", iface, pEnumAdvise);
 252     return OLE_E_ADVISENOTSUPPORTED;
 253 }
 254
 255
 256 static const IDataObjectVtbl dovt =
 257 {
 258     dddo_QueryInterface,
 259     dddo_AddRef,
 260     dddo_Release,
 261     dddo_GetData,
 262     dddo_GetDataHere,
 263     dddo_QueryGetData,
 264     dddo_GetConicalFormatEtc,
 265     dddo_SetData,
 266     dddo_EnumFormatEtc,
 267     dddo_DAdvise,
 268     dddo_DUnadvise,
 269     dddo_EnumDAdvise
 270 };
 271
 272
 273 static IDataObject *create_data_object_for_pasteboard(CFTypeRef pasteboard)
 274 {
 275     DragDropDataObject *dddo;
 276
 277     dddo = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*dddo));
 278     if (!dddo)
 279         return NULL;
 280
 281     dddo->ref = 1;
 282     dddo->IDataObject_iface.lpVtbl = &dovt;
 283     dddo->pasteboard = CFRetain(pasteboard);
 284
 285     return &dddo->IDataObject_iface;
 286 }
 287
 288
 289 /**************************************************************************
 290  *              drag_operations_to_dropeffects
 291  */
 292 static DWORD drag_operations_to_dropeffects(uint32_t ops)
 293 {
 294     DWORD effects = DROPEFFECT_NONE;
 295     if (ops & (DRAG_OP_COPY | DRAG_OP_GENERIC))
 296         effects |= DROPEFFECT_COPY;
 297     if (ops & DRAG_OP_MOVE)
 298         effects |= DROPEFFECT_MOVE;
 299     if (ops & (DRAG_OP_LINK | DRAG_OP_GENERIC))
 300         effects |= DROPEFFECT_LINK;
 301     return effects;
 302 }
 303
 304
 305 /**************************************************************************
 306  *              dropeffect_to_drag_operation
 307  */
 308 static uint32_t dropeffect_to_drag_operation(DWORD effect, uint32_t ops)
 309 {
 310     switch (effect)
 311     {
 312         case DROPEFFECT_COPY: return (ops & DRAG_OP_COPY) ? DRAG_OP_COPY : DRAG_OP_GENERIC;
 313         case DROPEFFECT_MOVE: return DRAG_OP_MOVE;
 314         case DROPEFFECT_LINK: return (ops & DRAG_OP_LINK) ? DRAG_OP_LINK : DRAG_OP_GENERIC;
 315     }
 316
 317     return DRAG_OP_NONE;
 318 }
 319
 320
 321 /* Based on functions in dlls/ole32/ole2.c */
 322 static HANDLE get_droptarget_local_handle(HWND hwnd)
 323 {
 324     static const WCHAR prop_marshalleddroptarget[] =
 325         {'W','i','n','e','M','a','r','s','h','a','l','l','e','d','D','r','o','p','T','a','r','g','e','t',0};
 326     HANDLE handle;
 327     HANDLE local_handle = 0;
 328
 329     handle = GetPropW(hwnd, prop_marshalleddroptarget);
 330     if (handle)
 331     {
 332         DWORD pid;
 333         HANDLE process;
 334
 335         GetWindowThreadProcessId(hwnd, &pid);
 336         process = OpenProcess(PROCESS_DUP_HANDLE, FALSE, pid);
 337         if (process)
 338         {
 339             DuplicateHandle(process, handle, GetCurrentProcess(), &local_handle, 0, FALSE, DUPLICATE_SAME_ACCESS);
 340             CloseHandle(process);
 341         }
 342     }
 343     return local_handle;
 344 }
 345
 346
 347 static HRESULT create_stream_from_map(HANDLE map, IStream **stream)
 348 {
 349     HRESULT hr = E_OUTOFMEMORY;
 350     HGLOBAL hmem;
 351     void *data;
 352     MEMORY_BASIC_INFORMATION info;
 353
 354     data = MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
 355     if(!data) return hr;
 356
 357     VirtualQuery(data, &info, sizeof(info));
 358     TRACE("size %d\n", (int)info.RegionSize);
 359
 360     hmem = GlobalAlloc(GMEM_MOVEABLE, info.RegionSize);
 361     if(hmem)
 362     {
 363         memcpy(GlobalLock(hmem), data, info.RegionSize);
 364         GlobalUnlock(hmem);
 365         hr = CreateStreamOnHGlobal(hmem, TRUE, stream);
 366     }
 367     UnmapViewOfFile(data);
 368     return hr;
 369 }
 370
 371
 372 static IDropTarget* get_droptarget_pointer(HWND hwnd)
 373 {
 374     IDropTarget *droptarget = NULL;
 375     HANDLE map;
 376     IStream *stream;
 377
 378     map = get_droptarget_local_handle(hwnd);
 379     if(!map) return NULL;
 380
 381     if(SUCCEEDED(create_stream_from_map(map, &stream)))
 382     {
 383         CoUnmarshalInterface(stream, &IID_IDropTarget, (void**)&droptarget);
 384         IStream_Release(stream);
 385     }
 386     CloseHandle(map);
 387     return droptarget;
 388 }
 389
 390
 391 /**************************************************************************
 392  *              query_drag_drop
 393  */
 394 BOOL query_drag_drop(macdrv_query* query)
 395 {
 396     BOOL ret = FALSE;
 397     HWND hwnd = macdrv_get_window_hwnd(query->window);
 398     struct macdrv_win_data *data = get_win_data(hwnd);
 399     POINT pt;
 400     IDropTarget *droptarget;
 401
 402     TRACE("win %p/%p x,y %d,%d op 0x%08x pasteboard %p\n", hwnd, query->window,
 403           query->drag_drop.x, query->drag_drop.y, query->drag_drop.op, query->drag_drop.pasteboard);
 404
 405     if (!data)
 406     {
 407         WARN("no win_data for win %p/%p\n", hwnd, query->window);
 408         return FALSE;
 409     }
 410
 411     pt.x = query->drag_drop.x + data->whole_rect.left;
 412     pt.y = query->drag_drop.y + data->whole_rect.top;
 413     release_win_data(data);
 414
 415     droptarget = get_droptarget_pointer(last_droptarget_hwnd);
 416     if (droptarget)
 417     {
 418         HRESULT hr;
 419         POINTL pointl;
 420         DWORD effect = drag_operations_to_dropeffects(query->drag_drop.op);
 421
 422         if (!active_data_object)
 423         {
 424             WARN("shouldn't happen: no active IDataObject\n");
 425             active_data_object = create_data_object_for_pasteboard(query->drag_drop.pasteboard);
 426         }
 427
 428         pointl.x = pt.x;
 429         pointl.y = pt.y;
 430         TRACE("Drop hwnd %p droptarget %p pointl (%d,%d) effect 0x%08x\n", last_droptarget_hwnd,
 431               droptarget, pointl.x, pointl.y, effect);
 432         hr = IDropTarget_Drop(droptarget, active_data_object, MK_LBUTTON, pointl, &effect);
 433         if (SUCCEEDED(hr))
 434         {
 435             if (effect != DROPEFFECT_NONE)
 436             {
 437                 TRACE("drop succeeded\n");
 438                 ret = TRUE;
 439             }
 440             else
 441                 TRACE("the application refused the drop\n");
 442         }
 443         else
 444             WARN("drop failed, error 0x%08X\n", hr);
 445         IDropTarget_Release(droptarget);
 446     }
 447     else
 448     {
 449         hwnd = WindowFromPoint(pt);
 450         while (hwnd && !(GetWindowLongW(hwnd, GWL_EXSTYLE) & WS_EX_ACCEPTFILES))
 451             hwnd = GetParent(hwnd);
 452         if (hwnd)
 453         {
 454             HDROP hdrop = macdrv_get_pasteboard_data(query->drag_drop.pasteboard, CF_HDROP);
 455             DROPFILES *dropfiles = GlobalLock(hdrop);
 456             if (dropfiles)
 457             {
 458                 dropfiles->pt.x = pt.x;
 459                 dropfiles->pt.y = pt.y;
 460                 dropfiles->fNC  = TRUE;
 461
 462                 TRACE("sending WM_DROPFILES: hwnd %p pt %s %s\n", hwnd, wine_dbgstr_point(&pt),
 463                       debugstr_w((WCHAR*)((char*)dropfiles + dropfiles->pFiles)));
 464
 465                 GlobalUnlock(hdrop);
 466
 467                 ret = PostMessageW(hwnd, WM_DROPFILES, (WPARAM)hdrop, 0L);
 468                 /* hdrop is owned by the message and freed when the recipient calls DragFinish(). */
 469             }
 470             else
 471                 GlobalFree(hdrop);
 472         }
 473     }
 474
 475     if (active_data_object) IDataObject_Release(active_data_object);
 476     active_data_object = NULL;
 477     last_droptarget_hwnd = NULL;
 478     return ret;
 479 }
 480
 481
 482 /**************************************************************************
 483  *              query_drag_exited
 484  */
 485 BOOL query_drag_exited(macdrv_query* query)
 486 {
 487     HWND hwnd = macdrv_get_window_hwnd(query->window);
 488     IDropTarget *droptarget;
 489
 490     TRACE("win %p/%p\n", hwnd, query->window);
 491
 492     droptarget = get_droptarget_pointer(last_droptarget_hwnd);
 493     if (droptarget)
 494     {
 495         HRESULT hr;
 496
 497         TRACE("DragLeave hwnd %p droptarget %p\n", last_droptarget_hwnd, droptarget);
 498         hr = IDropTarget_DragLeave(droptarget);
 499         if (FAILED(hr))
 500             WARN("IDropTarget_DragLeave failed, error 0x%08X\n", hr);
 501         IDropTarget_Release(droptarget);
 502     }
 503
 504     if (active_data_object) IDataObject_Release(active_data_object);
 505     active_data_object = NULL;
 506     last_droptarget_hwnd = NULL;
 507
 508     return TRUE;
 509 }
 510
 511
 512 /**************************************************************************
 513  *              query_drag_operation
 514  */
 515 BOOL query_drag_operation(macdrv_query* query)
 516 {
 517     BOOL ret = FALSE;
 518     HWND hwnd = macdrv_get_window_hwnd(query->window);
 519     struct macdrv_win_data *data = get_win_data(hwnd);
 520     POINT pt;
 521     DWORD effect;
 522     IDropTarget *droptarget;
 523     HRESULT hr;
 524
 525     TRACE("win %p/%p x,y %d,%d offered_ops 0x%x pasteboard %p\n", hwnd, query->window,
 526           query->drag_operation.x, query->drag_operation.y, query->drag_operation.offered_ops,
 527           query->drag_operation.pasteboard);
 528
 529     if (!data)
 530     {
 531         WARN("no win_data for win %p/%p\n", hwnd, query->window);
 532         return FALSE;
 533     }
 534
 535     pt.x = query->drag_operation.x + data->whole_rect.left;
 536     pt.y = query->drag_operation.y + data->whole_rect.top;
 537     release_win_data(data);
 538
 539     effect = drag_operations_to_dropeffects(query->drag_operation.offered_ops);
 540
 541     /* Instead of the top-level window we got in the query, start with the deepest
 542        child under the cursor.  Travel up the hierarchy looking for a window that
 543        has an associated IDropTarget. */
 544     hwnd = WindowFromPoint(pt);
 545     do
 546     {
 547         droptarget = get_droptarget_pointer(hwnd);
 548     } while (!droptarget && (hwnd = GetParent(hwnd)));
 549
 550     if (last_droptarget_hwnd != hwnd)
 551     {
 552         if (last_droptarget_hwnd)
 553         {
 554             IDropTarget *old_droptarget = get_droptarget_pointer(last_droptarget_hwnd);
 555             if (old_droptarget)
 556             {
 557                 TRACE("DragLeave hwnd %p droptarget %p\n", last_droptarget_hwnd, old_droptarget);
 558                 hr = IDropTarget_DragLeave(old_droptarget);
 559                 if (FAILED(hr))
 560                     WARN("IDropTarget_DragLeave failed, error 0x%08X\n", hr);
 561                 IDropTarget_Release(old_droptarget);
 562             }
 563         }
 564
 565         last_droptarget_hwnd = hwnd;
 566
 567         if (droptarget)
 568         {
 569             POINTL pointl = { pt.x, pt.y };
 570
 571             if (!active_data_object)
 572                 active_data_object = create_data_object_for_pasteboard(query->drag_operation.pasteboard);
 573
 574             TRACE("DragEnter hwnd %p droptarget %p\n", hwnd, droptarget);
 575             hr = IDropTarget_DragEnter(droptarget, active_data_object, MK_LBUTTON,
 576                                        pointl, &effect);
 577             if (SUCCEEDED(hr))
 578             {
 579                 query->drag_operation.accepted_op = dropeffect_to_drag_operation(effect,
 580                                                         query->drag_operation.offered_ops);
 581                 TRACE("    effect %d accepted op %d\n", effect, query->drag_operation.accepted_op);
 582                 ret = TRUE;
 583             }
 584             else
 585                 WARN("IDropTarget_DragEnter failed, error 0x%08X\n", hr);
 586             IDropTarget_Release(droptarget);
 587         }
 588     }
 589     else if (droptarget)
 590     {
 591         POINTL pointl = { pt.x, pt.y };
 592
 593         TRACE("DragOver hwnd %p droptarget %p\n", hwnd, droptarget);
 594         hr = IDropTarget_DragOver(droptarget, MK_LBUTTON, pointl, &effect);
 595         if (SUCCEEDED(hr))
 596         {
 597             query->drag_operation.accepted_op = dropeffect_to_drag_operation(effect,
 598                                                     query->drag_operation.offered_ops);
 599             TRACE("    effect %d accepted op %d\n", effect, query->drag_operation.accepted_op);
 600             ret = TRUE;
 601         }
 602         else
 603             WARN("IDropTarget_DragOver failed, error 0x%08X\n", hr);
 604         IDropTarget_Release(droptarget);
 605     }
 606
 607     if (!ret)
 608     {
 609         hwnd = WindowFromPoint(pt);
 610         while (hwnd && !(GetWindowLongW(hwnd, GWL_EXSTYLE) & WS_EX_ACCEPTFILES))
 611             hwnd = GetParent(hwnd);
 612         if (hwnd)
 613         {
 614             FORMATETC formatEtc;
 615
 616             if (!active_data_object)
 617                 active_data_object = create_data_object_for_pasteboard(query->drag_operation.pasteboard);
 618
 619             formatEtc.cfFormat = CF_HDROP;
 620             formatEtc.ptd = NULL;
 621             formatEtc.dwAspect = DVASPECT_CONTENT;
 622             formatEtc.lindex = -1;
 623             formatEtc.tymed = TYMED_HGLOBAL;
 624             if (SUCCEEDED(IDataObject_QueryGetData(active_data_object, &formatEtc)))
 625             {
 626                 TRACE("WS_EX_ACCEPTFILES hwnd %p\n", hwnd);
 627                 query->drag_operation.accepted_op = DRAG_OP_GENERIC;
 628                 ret = TRUE;
 629             }
 630         }
 631     }
 632
 633     TRACE(" -> %s\n", ret ? "TRUE" : "FALSE");
 634     return ret;
 635 }