ole/ole2.c

   1 /*
   2  *      OLE2 library
   3  *
   4  *      Copyright 1995  Martin von Loewis
   5  *      Copyright 1999  Francis Beaudet
   6  *      Copyright 1999  Noel Borthwick
   7  */
   8
   9 #include <assert.h>
  10
  11 #include "winuser.h"
  12 #include "winerror.h"
  13 #include "ole2.h"
  14 #include "process.h"
  15 #include "hook.h"
  16 #include "commctrl.h"
  17 #include "wine/obj_clientserver.h"
  18 #include "debug.h"
  19 #include "ole2ver.h"
  20
  21 DEFAULT_DEBUG_CHANNEL(ole)
  22
  23 /******************************************************************************
  24  * These are static/global variables and internal data structures that the
  25  * OLE module uses to maintain it's state.
  26  */
  27 typedef struct tagDropTargetNode
  28 {
  29   HWND          hwndTarget;
  30   IDropTarget*    dropTarget;
  31   struct tagDropTargetNode* prevDropTarget;
  32   struct tagDropTargetNode* nextDropTarget;
  33 } DropTargetNode;
  34
  35 typedef struct tagTrackerWindowInfo
  36 {
  37   IDataObject* dataObject;
  38   IDropSource* dropSource;
  39   DWORD        dwOKEffect;
  40   DWORD*       pdwEffect;
  41   BOOL       trackingDone;
  42   HRESULT      returnValue;
  43
  44   BOOL       escPressed;
  45   HWND       curDragTargetHWND;
  46   IDropTarget* curDragTarget;
  47 } TrackerWindowInfo;
  48
  49 typedef struct tagOleMenuDescriptor  /* OleMenuDescriptor */
  50 {
  51   HWND               hwndFrame;         /* The containers frame window */
  52   HWND               hwndActiveObject;  /* The active objects window */
  53   OLEMENUGROUPWIDTHS mgw;               /* OLE menu group widths for the shared menu */
  54   HMENU              hmenuCombined;     /* The combined menu */
  55   BOOL               bIsServerItem;     /* True if the currently open popup belongs to the server */
  56 } OleMenuDescriptor;
  57
  58 typedef struct tagOleMenuHookItem   /* OleMenu hook item in per thread hook list */
  59 {
  60   DWORD tid;                /* Thread Id  */
  61   HANDLE hHeap;             /* Heap this is allocated from */
  62   HHOOK GetMsg_hHook;       /* message hook for WH_GETMESSAGE */
  63   HHOOK CallWndProc_hHook;  /* message hook for WH_CALLWNDPROC */
  64 } OleMenuHookItem;
  65
  66 /*
  67  * Dynamic pointer array of per thread message hooks (maintained by OleSetMenuDescriptor)
  68  */
  69 static HDPA OLEMenu_MsgHookDPA = NULL;
  70
  71 /*
  72  * This is the lock count on the OLE library. It is controlled by the
  73  * OLEInitialize/OLEUninitialize methods.
  74  */
  75 static ULONG OLE_moduleLockCount = 0;
  76
  77 /*
  78  * Name of our registered window class.
  79  */
  80 static const char OLEDD_DRAGTRACKERCLASS[] = "WineDragDropTracker32";
  81
  82 /*
  83  * This is the head of the Drop target container.
  84  */
  85 static DropTargetNode* targetListHead = NULL;
  86
  87 /******************************************************************************
  88  * These are the prototypes of the utility methods used to manage a shared menu
  89  */
  90 static void OLEMenu_Initialize();
  91 static void OLEMenu_UnInitialize();
  92 BOOL OLEMenu_InstallHooks( DWORD tid );
  93 BOOL OLEMenu_UnInstallHooks( DWORD tid );
  94 OleMenuHookItem * OLEMenu_IsHookInstalled( DWORD tid, INT *pixHook );
  95 static BOOL OLEMenu_FindMainMenuIndex( HMENU hMainMenu, HMENU hPopupMenu, UINT *pnPos );
  96 BOOL OLEMenu_SetIsServerMenu( HMENU hmenu, OleMenuDescriptor *pOleMenuDescriptor );
  97 LRESULT CALLBACK OLEMenu_CallWndProc(INT code, WPARAM wParam, LPARAM lParam);
  98 LRESULT CALLBACK OLEMenu_GetMsgProc(INT code, WPARAM wParam, LPARAM lParam);
  99
 100 /******************************************************************************
 101  * These are the prototypes of the utility methods used for OLE Drag n Drop
 102  */
 103 static void            OLEDD_Initialize();
 104 static void            OLEDD_UnInitialize();
 105 static void            OLEDD_InsertDropTarget(
 106                          DropTargetNode* nodeToAdd);
 107 static DropTargetNode* OLEDD_ExtractDropTarget(
 108                          HWND hwndOfTarget);
 109 static DropTargetNode* OLEDD_FindDropTarget(
 110                          HWND hwndOfTarget);
 111 static LRESULT WINAPI  OLEDD_DragTrackerWindowProc(
 112                          HWND   hwnd,
 113                          UINT   uMsg,
 114                          WPARAM wParam,
 115                          LPARAM   lParam);
 116 static void OLEDD_TrackMouseMove(
 117                          TrackerWindowInfo* trackerInfo,
 118                          POINT            mousePos,
 119                          DWORD              keyState);
 120 static void OLEDD_TrackStateChange(
 121                          TrackerWindowInfo* trackerInfo,
 122                          POINT            mousePos,
 123                          DWORD              keyState);
 124 static DWORD OLEDD_GetButtonState();
 125
 126
 127 /******************************************************************************
 128  *              OleBuildVersion [OLE2.1]
 129  */
 130 DWORD WINAPI OleBuildVersion(void)
 131 {
 132     TRACE(ole,"(void)\n");
 133     return (rmm<<16)+rup;
 134 }
 135
 136 /***********************************************************************
 137  *           OleInitialize       (OLE2.2) (OLE32.108)
 138  */
 139 HRESULT WINAPI OleInitialize(LPVOID reserved)
 140 {
 141   HRESULT hr;
 142
 143   TRACE(ole, "(%p)\n", reserved);
 144
 145   /*
 146    * The first duty of the OleInitialize is to initialize the COM libraries.
 147    */
 148   hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
 149
 150   /*
 151    * If the CoInitializeEx call failed, the OLE libraries can't be
 152    * initialized.
 153    */
 154   if (FAILED(hr))
 155     return hr;
 156
 157   /*
 158    * Then, it has to initialize the OLE specific modules.
 159    * This includes:
 160    *     Clipboard
 161    *     Drag and Drop
 162    *     Object linking and Embedding
 163    *     In-place activation
 164    */
 165   if (OLE_moduleLockCount==0)
 166 {
 167     /*
 168      * Initialize the libraries.
 169      */
 170     TRACE(ole, "() - Initializing the OLE libraries\n");
 171
 172     /*
 173      * Drag and Drop
 174      */
 175     OLEDD_Initialize();
 176
 177     /*
 178      * OLE shared menu
 179      */
 180     OLEMenu_Initialize();
 181 }
 182
 183   /*
 184    * Then, we increase the lock count on the OLE module.
 185    */
 186   OLE_moduleLockCount++;
 187
 188   return hr;
 189 }
 190
 191 /******************************************************************************
 192  *              CoGetCurrentProcess     [COMPOBJ.34] [OLE2.2][OLE32.108]
 193  *
 194  * NOTES
 195  *   Is DWORD really the correct return type for this function?
 196  */
 197 DWORD WINAPI CoGetCurrentProcess(void) {
 198         return (DWORD)PROCESS_Current();
 199 }
 200
 201 /******************************************************************************
 202  *              OleUninitialize [OLE2.3] [OLE32.131]
 203  */
 204 void WINAPI OleUninitialize(void)
 205 {
 206   TRACE(ole, "()\n");
 207
 208   /*
 209    * Decrease the lock count on the OLE module.
 210    */
 211   OLE_moduleLockCount--;
 212
 213   /*
 214    * If we hit the bottom of the lock stack, free the libraries.
 215    */
 216   if (OLE_moduleLockCount==0)
 217   {
 218     /*
 219      * Actually free the libraries.
 220      */
 221     TRACE(ole, "() - Freeing the last reference count\n");
 222
 223     /*
 224      * Drag and Drop
 225      */
 226     OLEDD_UnInitialize();
 227
 228     /*
 229      * OLE shared menu
 230      */
 231     OLEMenu_UnInitialize();
 232   }
 233
 234   /*
 235    * Then, uninitialize the COM libraries.
 236    */
 237   CoUninitialize();
 238 }
 239
 240 /***********************************************************************
 241  *           OleFlushClipboard   [OLE2.76]
 242  */
 243 HRESULT WINAPI OleFlushClipboard16(void)
 244 {
 245     return S_OK;
 246 }
 247
 248 /***********************************************************************
 249  *           OleSetClipboard     [OLE32.127]
 250  */
 251 HRESULT WINAPI OleSetClipboard(LPVOID pDataObj)
 252 {
 253     FIXME(ole,"(%p), stub!\n", pDataObj);
 254     return S_OK;
 255 }
 256
 257 /******************************************************************************
 258  *              CoRegisterMessageFilter32       [OLE32.38]
 259  */
 260 HRESULT WINAPI CoRegisterMessageFilter(
 261     LPMESSAGEFILTER lpMessageFilter,    /* Pointer to interface */
 262     LPMESSAGEFILTER *lplpMessageFilter  /* Indirect pointer to prior instance if non-NULL */
 263 ) {
 264     FIXME(ole,"stub\n");
 265     if (lplpMessageFilter) {
 266         *lplpMessageFilter = NULL;
 267     }
 268     return S_OK;
 269 }
 270
 271 /******************************************************************************
 272  *              OleInitializeWOW        [OLE32.109]
 273  */
 274 HRESULT WINAPI OleInitializeWOW(DWORD x) {
 275         FIXME(ole,"(0x%08lx),stub!\n",x);
 276         return 0;
 277 }
 278
 279 /***********************************************************************
 280  *           RegisterDragDrop16 (OLE2.35)
 281  */
 282 HRESULT WINAPI RegisterDragDrop16(
 283         HWND16 hwnd,
 284         LPDROPTARGET pDropTarget
 285 ) {
 286         FIXME(ole,"(0x%04x,%p),stub!\n",hwnd,pDropTarget);
 287         return S_OK;
 288 }
 289
 290 /***********************************************************************
 291  *           RegisterDragDrop32 (OLE32.139)
 292  */
 293 HRESULT WINAPI RegisterDragDrop(
 294         HWND hwnd,
 295         LPDROPTARGET pDropTarget)
 296 {
 297   DropTargetNode* dropTargetInfo;
 298
 299   TRACE(ole,"(0x%x,%p)\n", hwnd, pDropTarget);
 300
 301   /*
 302    * First, check if the window is already registered.
 303    */
 304   dropTargetInfo = OLEDD_FindDropTarget(hwnd);
 305
 306   if (dropTargetInfo!=NULL)
 307     return DRAGDROP_E_ALREADYREGISTERED;
 308
 309   /*
 310    * If it's not there, we can add it. We first create a node for it.
 311    */
 312   dropTargetInfo = HeapAlloc(GetProcessHeap(), 0, sizeof(DropTargetNode));
 313
 314   if (dropTargetInfo==NULL)
 315     return E_OUTOFMEMORY;
 316
 317   dropTargetInfo->hwndTarget     = hwnd;
 318   dropTargetInfo->prevDropTarget = NULL;
 319   dropTargetInfo->nextDropTarget = NULL;
 320
 321   /*
 322    * Don't forget that this is an interface pointer, need to nail it down since
 323    * we keep a copy of it.
 324    */
 325   dropTargetInfo->dropTarget  = pDropTarget;
 326   IDropTarget_AddRef(dropTargetInfo->dropTarget);
 327
 328   OLEDD_InsertDropTarget(dropTargetInfo);
 329
 330         return S_OK;
 331 }
 332
 333 /***********************************************************************
 334  *           RevokeDragDrop16 (OLE2.36)
 335  */
 336 HRESULT WINAPI RevokeDragDrop16(
 337         HWND16 hwnd
 338 ) {
 339         FIXME(ole,"(0x%04x),stub!\n",hwnd);
 340         return S_OK;
 341 }
 342
 343 /***********************************************************************
 344  *           RevokeDragDrop32 (OLE32.141)
 345  */
 346 HRESULT WINAPI RevokeDragDrop(
 347         HWND hwnd)
 348 {
 349   DropTargetNode* dropTargetInfo;
 350
 351   TRACE(ole,"(0x%x)\n", hwnd);
 352
 353   /*
 354    * First, check if the window is already registered.
 355    */
 356   dropTargetInfo = OLEDD_ExtractDropTarget(hwnd);
 357
 358   /*
 359    * If it ain't in there, it's an error.
 360    */
 361   if (dropTargetInfo==NULL)
 362     return DRAGDROP_E_NOTREGISTERED;
 363
 364   /*
 365    * If it's in there, clean-up it's used memory and
 366    * references
 367    */
 368   IDropTarget_Release(dropTargetInfo->dropTarget);
 369   HeapFree(GetProcessHeap(), 0, dropTargetInfo);
 370
 371         return S_OK;
 372 }
 373
 374 /***********************************************************************
 375  *           OleRegGetUserType (OLE32.122)
 376  */
 377 HRESULT WINAPI OleRegGetUserType(
 378         REFCLSID clsid,
 379         DWORD dwFormOfType,
 380         LPOLESTR* pszUserType)
 381 {
 382         FIXME(ole,",stub!\n");
 383         return S_OK;
 384 }
 385
 386 /***********************************************************************
 387  * DoDragDrop32 [OLE32.65]
 388  */
 389 HRESULT WINAPI DoDragDrop (
 390   IDataObject *pDataObject,  /* ptr to the data obj           */
 391   IDropSource* pDropSource,  /* ptr to the source obj         */
 392   DWORD       dwOKEffect,    /* effects allowed by the source */
 393   DWORD       *pdwEffect)    /* ptr to effects of the source  */
 394 {
 395   TrackerWindowInfo trackerInfo;
 396   HWND            hwndTrackWindow;
 397   MSG             msg;
 398
 399   TRACE(ole,"(DataObject %p, DropSource %p)\n", pDataObject, pDropSource);
 400
 401   /*
 402    * Setup the drag n drop tracking window.
 403    */
 404   trackerInfo.dataObject        = pDataObject;
 405   trackerInfo.dropSource        = pDropSource;
 406   trackerInfo.dwOKEffect        = dwOKEffect;
 407   trackerInfo.pdwEffect         = pdwEffect;
 408   trackerInfo.trackingDone      = FALSE;
 409   trackerInfo.escPressed        = FALSE;
 410   trackerInfo.curDragTargetHWND = 0;
 411   trackerInfo.curDragTarget     = 0;
 412
 413   hwndTrackWindow = CreateWindowA(OLEDD_DRAGTRACKERCLASS,
 414                                     "TrackerWindow",
 415                                     WS_POPUP,
 416                                     CW_USEDEFAULT, CW_USEDEFAULT,
 417                                     CW_USEDEFAULT, CW_USEDEFAULT,
 418                                     0,
 419                                     0,
 420                                     0,
 421                                     (LPVOID)&trackerInfo);
 422
 423   if (hwndTrackWindow!=0)
 424   {
 425     /*
 426      * Capture the mouse input
 427      */
 428     SetCapture(hwndTrackWindow);
 429
 430     /*
 431      * Pump messages. All mouse input should go the the capture window.
 432      */
 433     while (!trackerInfo.trackingDone && GetMessageA(&msg, 0, 0, 0) )
 434     {
 435       if ( (msg.message >= WM_KEYFIRST) &&
 436            (msg.message <= WM_KEYFIRST) )
 437       {
 438         /*
 439          * When keyboard messages are sent to windows on this thread, we
 440          * want to ignore notify the drop source that the state changed.
 441          * in the case of the Escape key, we also notify the drop source
 442          * we give it a special meaning.
 443          */
 444         if ( (msg.message==WM_KEYDOWN) &&
 445              (msg.wParam==VK_ESCAPE) )
 446         {
 447           trackerInfo.escPressed = TRUE;
 448         }
 449
 450         /*
 451          * Notify the drop source.
 452          */
 453         OLEDD_TrackStateChange(&trackerInfo,
 454                                msg.pt,
 455                                OLEDD_GetButtonState());
 456       }
 457       else
 458       {
 459         /*
 460          * Dispatch the messages only when it's not a keyboard message.
 461          */
 462         DispatchMessageA(&msg);
 463       }
 464     }
 465
 466     /*
 467      * Destroy the temporary window.
 468      */
 469     DestroyWindow(hwndTrackWindow);
 470
 471     return trackerInfo.returnValue;
 472   }
 473
 474   return E_FAIL;
 475 }
 476
 477 /***********************************************************************
 478  * OleQueryLinkFromData32 [OLE32.118]
 479  */
 480 HRESULT WINAPI OleQueryLinkFromData(
 481   IDataObject* pSrcDataObject)
 482 {
 483   FIXME(ole,"(%p),stub!\n", pSrcDataObject);
 484   return S_OK;
 485 }
 486
 487 /***********************************************************************
 488  * OleRegGetMiscStatus [OLE32.121]
 489  */
 490 HRESULT WINAPI OleRegGetMiscStatus(
 491   REFCLSID clsid,
 492   DWORD    dwAspect,
 493   DWORD*   pdwStatus)
 494 {
 495   FIXME(ole,"(),stub!\n");
 496   return REGDB_E_CLASSNOTREG;
 497 }
 498
 499 /***********************************************************************
 500  * OleGetClipboard32 [OLE32.105]
 501  */
 502 HRESULT WINAPI OleGetClipboard(
 503   IDataObject** ppDataObj)
 504 {
 505   FIXME(ole,"(%p),stub!\n", ppDataObj);
 506
 507   if (ppDataObj)
 508     *ppDataObj=0;
 509
 510   return E_FAIL;
 511 }
 512
 513
 514 /**************************************************************************
 515  * Internal methods to manage the shared OLE menu in response to the
 516  * OLE***MenuDescriptor API
 517  */
 518
 519 /***
 520  * OLEMenu_Initialize()
 521  *
 522  * Initializes the OLEMENU data structures.
 523  */
 524 static void OLEMenu_Initialize()
 525 {
 526   /* Create a dynamic pointer array to store the hook handles */
 527   if ( !OLEMenu_MsgHookDPA )
 528     OLEMenu_MsgHookDPA = DPA_CreateEx( 2, GetProcessHeap() );
 529 }
 530
 531 /***
 532  * OLEMenu_UnInitialize()
 533  *
 534  * Releases the OLEMENU data structures.
 535  */
 536 static void OLEMenu_UnInitialize()
 537 {
 538   /* Release the hook table */
 539   if ( OLEMenu_MsgHookDPA )
 540     DPA_Destroy( OLEMenu_MsgHookDPA );
 541
 542   OLEMenu_MsgHookDPA = NULL;
 543 }
 544
 545 /*************************************************************************
 546  * OLEMenu_InstallHooks
 547  * Install thread scope message hooks for WH_GETMESSAGE and WH_CALLWNDPROC
 548  *
 549  * RETURNS: TRUE if message hooks were succesfully installed
 550  *          FALSE on failure
 551  */
 552 BOOL OLEMenu_InstallHooks( DWORD tid )
 553 {
 554   OleMenuHookItem *pHookItem = NULL;
 555
 556   if ( !OLEMenu_MsgHookDPA ) /* No hook table? Create one */
 557   {
 558     /* Create a dynamic pointer array to store the hook handles */
 559     if ( !(OLEMenu_MsgHookDPA = DPA_CreateEx( 2, GetProcessHeap() )) )
 560       return FALSE;
 561   }
 562
 563   /* Create an entry for the hook table */
 564   if ( !(pHookItem = HeapAlloc(GetProcessHeap(), 0,
 565                                sizeof(OleMenuHookItem)) ) )
 566     return FALSE;
 567
 568   pHookItem->tid = tid;
 569   pHookItem->hHeap = GetProcessHeap();
 570
 571   /* Install a thread scope message hook for WH_GETMESSAGE */
 572   pHookItem->GetMsg_hHook = SetWindowsHookExA( WH_GETMESSAGE, OLEMenu_GetMsgProc,
 573                                                0, GetCurrentThreadId() );
 574   if ( !pHookItem->GetMsg_hHook )
 575     goto CLEANUP;
 576
 577   /* Install a thread scope message hook for WH_CALLWNDPROC */
 578   pHookItem->CallWndProc_hHook = SetWindowsHookExA( WH_CALLWNDPROC, OLEMenu_CallWndProc,
 579                                                     0, GetCurrentThreadId() );
 580   if ( !pHookItem->CallWndProc_hHook )
 581     goto CLEANUP;
 582
 583   /* Insert the hook table entry */
 584   if ( -1 == DPA_InsertPtr( OLEMenu_MsgHookDPA, 0, pHookItem ) )
 585     goto CLEANUP;
 586
 587   return TRUE;
 588
 589 CLEANUP:
 590   /* Unhook any hooks */
 591   if ( pHookItem->GetMsg_hHook )
 592     UnhookWindowsHookEx( pHookItem->GetMsg_hHook );
 593   if ( pHookItem->CallWndProc_hHook )
 594     UnhookWindowsHookEx( pHookItem->CallWndProc_hHook );
 595   /* Release the hook table entry */
 596   HeapFree(pHookItem->hHeap, 0, pHookItem );
 597
 598   return FALSE;
 599 }
 600
 601 /*************************************************************************
 602  * OLEMenu_UnInstallHooks
 603  * UnInstall thread scope message hooks for WH_GETMESSAGE and WH_CALLWNDPROC
 604  *
 605  * RETURNS: TRUE if message hooks were succesfully installed
 606  *          FALSE on failure
 607  */
 608 BOOL OLEMenu_UnInstallHooks( DWORD tid )
 609 {
 610   INT ixHook;
 611   OleMenuHookItem *pHookItem = NULL;
 612
 613   if ( !OLEMenu_MsgHookDPA )  /* No hooks set */
 614     return TRUE;
 615
 616   /* Lookup the hHook index for this tid */
 617   if ( !OLEMenu_IsHookInstalled( tid , &ixHook ) )
 618     return TRUE;
 619
 620   /* Remove the hook entry from the table(the pointer itself is not deleted) */
 621   if ( !( pHookItem = DPA_DeletePtr(OLEMenu_MsgHookDPA, ixHook) ) )
 622     return FALSE;
 623
 624   /* Uninstall the hooks installed for this thread */
 625   if ( !UnhookWindowsHookEx( pHookItem->GetMsg_hHook ) )
 626     goto CLEANUP;
 627   if ( !UnhookWindowsHookEx( pHookItem->CallWndProc_hHook ) )
 628     goto CLEANUP;
 629
 630   /* Release the hook table entry */
 631   HeapFree(pHookItem->hHeap, 0, pHookItem );
 632
 633   return TRUE;
 634
 635 CLEANUP:
 636   /* Release the hook table entry */
 637   if (pHookItem)
 638     HeapFree(pHookItem->hHeap, 0, pHookItem );
 639
 640   return FALSE;
 641 }
 642
 643 /*************************************************************************
 644  * OLEMenu_IsHookInstalled
 645  * Tests if OLEMenu hooks have been installed for a thread
 646  *
 647  * RETURNS: The pointer and index of the hook table entry for the tid
 648  *          NULL and -1 for the index if no hooks were installed for this thread
 649  */
 650 OleMenuHookItem * OLEMenu_IsHookInstalled( DWORD tid, INT *pixHook )
 651 {
 652   INT ixHook;
 653   OleMenuHookItem *pHookItem = NULL;
 654
 655   if ( pixHook )
 656     *pixHook = -1;
 657
 658   if ( !OLEMenu_MsgHookDPA )  /* No hooks set */
 659     return NULL;
 660
 661   /* Do a simple linear search for an entry whose tid matches ours.
 662    * We really need a map but efficiency is not a concern here. */
 663   for( ixHook = 0; ; ixHook++ )
 664   {
 665     /* Retrieve the hook entry */
 666     if ( !( pHookItem = DPA_GetPtr(OLEMenu_MsgHookDPA, ixHook) ) )
 667       return NULL;
 668
 669     if ( tid == pHookItem->tid )
 670     {
 671       if ( pixHook )
 672         *pixHook = ixHook;
 673       return pHookItem;
 674     }
 675   }
 676
 677   return NULL;
 678 }
 679
 680 /***********************************************************************
 681  *           OLEMenu_FindMainMenuIndex
 682  *
 683  * Used by OLEMenu API to find the top level group a menu item belongs to.
 684  * On success pnPos contains the index of the item in the top level menu group
 685  *
 686  * RETURNS: TRUE if the ID was found, FALSE on failure
 687  */
 688 static BOOL OLEMenu_FindMainMenuIndex( HMENU hMainMenu, HMENU hPopupMenu, UINT *pnPos )
 689 {
 690   UINT i, nItems;
 691
 692   nItems = GetMenuItemCount( hMainMenu );
 693
 694   for (i = 0; i < nItems; i++)
 695   {
 696     HMENU hsubmenu;
 697
 698     /*  Is the current item a submenu? */
 699     if ( (hsubmenu = GetSubMenu(hMainMenu, i)) )
 700     {
 701       /* If the handle is the same we're done */
 702       if ( hsubmenu == hPopupMenu )
 703       {
 704         if (pnPos)
 705           *pnPos = i;
 706         return TRUE;
 707       }
 708       /* Recursively search without updating pnPos */
 709       else if ( OLEMenu_FindMainMenuIndex( hsubmenu, hPopupMenu, NULL ) )
 710       {
 711         if (pnPos)
 712           *pnPos = i;
 713         return TRUE;
 714       }
 715     }
 716   }
 717
 718   return FALSE;
 719 }
 720
 721 /***********************************************************************
 722  *           OLEMenu_SetIsServerMenu
 723  *
 724  * Checks whether a popup menu belongs to a shared menu group which is
 725  * owned by the server, and sets the menu descriptor state accordingly.
 726  * All menu messages from these groups should be routed to the server.
 727  *
 728  * RETURNS: TRUE if the popup menu is part of a server owned group
 729  *          FASE if the popup menu is part of a container owned group
 730  */
 731 BOOL OLEMenu_SetIsServerMenu( HMENU hmenu, OleMenuDescriptor *pOleMenuDescriptor )
 732 {
 733   UINT nPos = 0, nWidth, i;
 734
 735   pOleMenuDescriptor->bIsServerItem = FALSE;
 736
 737   /* Don't bother searching if the popup is the combined menu itself */
 738   if ( hmenu == pOleMenuDescriptor->hmenuCombined )
 739     return FALSE;
 740
 741   /* Find the menu item index in the shared OLE menu that this item belongs to */
 742   if ( !OLEMenu_FindMainMenuIndex( pOleMenuDescriptor->hmenuCombined, hmenu,  &nPos ) )
 743     return FALSE;
 744
 745   /* The group widths array has counts for the number of elements
 746    * in the groups File, Edit, Container, Object, Window, Help.
 747    * The Edit, Object & Help groups belong to the server object
 748    * and the other three belong to the container.
 749    * Loop thru the group widths and locate the group we are a member of.
 750    */
 751   for ( i = 0, nWidth = 0; i < 6; i++ )
 752   {
 753     nWidth += pOleMenuDescriptor->mgw.width[i];
 754     if ( nPos < nWidth )
 755     {
 756       /* Odd elements are server menu widths */
 757       pOleMenuDescriptor->bIsServerItem = (i%2) ? TRUE : FALSE;
 758       break;
 759     }
 760   }
 761
 762   return pOleMenuDescriptor->bIsServerItem;
 763 }
 764
 765 /*************************************************************************
 766  * OLEMenu_CallWndProc
 767  * Thread scope WH_CALLWNDPROC hook proc filter function (callback)
 768  * This is invoked from a message hook installed in OleSetMenuDescriptor.
 769  */
 770 LRESULT CALLBACK OLEMenu_CallWndProc(INT code, WPARAM wParam, LPARAM lParam)
 771 {
 772   LPCWPSTRUCT pMsg = NULL;
 773   HOLEMENU hOleMenu = 0;
 774   OleMenuDescriptor *pOleMenuDescriptor = NULL;
 775   OleMenuHookItem *pHookItem = NULL;
 776   WORD fuFlags;
 777
 778   TRACE(ole,"%i, %04x, %08x\n", code, wParam, (unsigned)lParam );
 779
 780   /* Check if we're being asked to process the message */
 781   if ( HC_ACTION != code )
 782     goto NEXTHOOK;
 783
 784   /* Retrieve the current message being dispatched from lParam */
 785   pMsg = (LPCWPSTRUCT)lParam;
 786
 787   /* Check if the message is destined for a window we are interested in:
 788    * If the window has an OLEMenu property we may need to dispatch
 789    * the menu message to its active objects window instead. */
 790
 791   hOleMenu = (HOLEMENU)GetPropA( pMsg->hwnd, "PROP_OLEMenuDescriptor" );
 792   if ( !hOleMenu )
 793     goto NEXTHOOK;
 794
 795   /* Get the menu descriptor */
 796   pOleMenuDescriptor = (OleMenuDescriptor *) GlobalLock( hOleMenu );
 797   if ( !pOleMenuDescriptor ) /* Bad descriptor! */
 798     goto NEXTHOOK;
 799
 800   /* Process menu messages */
 801   switch( pMsg->message )
 802   {
 803     case WM_INITMENU:
 804     {
 805       /* Reset the menu descriptor state */
 806       pOleMenuDescriptor->bIsServerItem = FALSE;
 807
 808       /* Send this message to the server as well */
 809       SendMessageA( pOleMenuDescriptor->hwndActiveObject,
 810                   pMsg->message, pMsg->wParam, pMsg->lParam );
 811       goto NEXTHOOK;
 812     }
 813
 814     case WM_INITMENUPOPUP:
 815     {
 816       /* Save the state for whether this is a server owned menu */
 817       OLEMenu_SetIsServerMenu( (HMENU)pMsg->wParam, pOleMenuDescriptor );
 818       break;
 819     }
 820
 821     case WM_MENUSELECT:
 822     {
 823       fuFlags = HIWORD(pMsg->wParam);  /* Get flags */
 824       if ( fuFlags & MF_SYSMENU )
 825          goto NEXTHOOK;
 826
 827       /* Save the state for whether this is a server owned popup menu */
 828       else if ( fuFlags & MF_POPUP )
 829         OLEMenu_SetIsServerMenu( (HMENU)pMsg->lParam, pOleMenuDescriptor );
 830
 831       break;
 832     }
 833
 834     case WM_DRAWITEM:
 835     {
 836       LPDRAWITEMSTRUCT lpdis = (LPDRAWITEMSTRUCT) pMsg->lParam;
 837       if ( pMsg->wParam != 0 || lpdis->CtlType != ODT_MENU )
 838         goto NEXTHOOK;  /* Not a menu message */
 839
 840       break;
 841     }
 842
 843     default:
 844       goto NEXTHOOK;
 845   }
 846
 847   /* If the message was for the server dispatch it accordingly */
 848   if ( pOleMenuDescriptor->bIsServerItem )
 849   {
 850     SendMessageA( pOleMenuDescriptor->hwndActiveObject,
 851                   pMsg->message, pMsg->wParam, pMsg->lParam );
 852   }
 853
 854 NEXTHOOK:
 855   if ( pOleMenuDescriptor )
 856     GlobalUnlock( hOleMenu );
 857
 858   /* Lookup the hook item for the current thread */
 859   if ( !( pHookItem = OLEMenu_IsHookInstalled( GetCurrentThreadId(), NULL ) ) )
 860   {
 861     /* This should never fail!! */
 862     WARN(ole, "could not retrieve hHook for current thread!\n" );
 863     return 0;
 864   }
 865
 866   /* Pass on the message to the next hooker */
 867   return CallNextHookEx( pHookItem->CallWndProc_hHook, code, wParam, lParam );
 868 }
 869
 870 /*************************************************************************
 871  * OLEMenu_GetMsgProc
 872  * Thread scope WH_GETMESSAGE hook proc filter function (callback)
 873  * This is invoked from a message hook installed in OleSetMenuDescriptor.
 874  */
 875 LRESULT CALLBACK OLEMenu_GetMsgProc(INT code, WPARAM wParam, LPARAM lParam)
 876 {
 877   LPMSG pMsg = NULL;
 878   HOLEMENU hOleMenu = 0;
 879   OleMenuDescriptor *pOleMenuDescriptor = NULL;
 880   OleMenuHookItem *pHookItem = NULL;
 881   WORD wCode;
 882
 883   TRACE(ole,"%i, %04x, %08x\n", code, wParam, (unsigned)lParam );
 884
 885   /* Check if we're being asked to process a  messages */
 886   if ( HC_ACTION != code )
 887     goto NEXTHOOK;
 888
 889   /* Retrieve the current message being dispatched from lParam */
 890   pMsg = (LPMSG)lParam;
 891
 892   /* Check if the message is destined for a window we are interested in:
 893    * If the window has an OLEMenu property we may need to dispatch
 894    * the menu message to its active objects window instead. */
 895
 896   hOleMenu = (HOLEMENU)GetPropA( pMsg->hwnd, "PROP_OLEMenuDescriptor" );
 897   if ( !hOleMenu )
 898     goto NEXTHOOK;
 899
 900   /* Process menu messages */
 901   switch( pMsg->message )
 902   {
 903     case WM_COMMAND:
 904     {
 905       wCode = HIWORD(pMsg->wParam);  /* Get notification code */
 906       if ( wCode )
 907         goto NEXTHOOK;  /* Not a menu message */
 908       break;
 909     }
 910     default:
 911       goto NEXTHOOK;
 912   }
 913
 914   /* Get the menu descriptor */
 915   pOleMenuDescriptor = (OleMenuDescriptor *) GlobalLock( hOleMenu );
 916   if ( !pOleMenuDescriptor ) /* Bad descriptor! */
 917     goto NEXTHOOK;
 918
 919   /* If the message was for the server dispatch it accordingly */
 920   if ( pOleMenuDescriptor->bIsServerItem )
 921   {
 922     /* Change the hWnd in the message to the active objects hWnd.
 923      * The message loop which reads this message will automatically
 924      * dispatch it to the embedded objects window. */
 925     pMsg->hwnd = pOleMenuDescriptor->hwndActiveObject;
 926   }
 927
 928 NEXTHOOK:
 929   if ( pOleMenuDescriptor )
 930     GlobalUnlock( hOleMenu );
 931
 932   /* Lookup the hook item for the current thread */
 933   if ( !( pHookItem = OLEMenu_IsHookInstalled( GetCurrentThreadId(), NULL ) ) )
 934   {
 935     /* This should never fail!! */
 936     WARN(ole, "could not retrieve hHook for current thread!\n" );
 937     return FALSE;
 938   }
 939
 940   /* Pass on the message to the next hooker */
 941   return CallNextHookEx( pHookItem->GetMsg_hHook, code, wParam, lParam );
 942 }
 943
 944 /***********************************************************************
 945  * OleCreateMenuDescriptor [OLE32.97]
 946  * Creates an OLE menu descriptor for OLE to use when dispatching
 947  * menu messages and commands.
 948  *
 949  * PARAMS:
 950  *    hmenuCombined  -  Handle to the objects combined menu
 951  *    lpMenuWidths   -  Pointer to array of 6 LONG's indicating menus per group
 952  *
 953  */
 954 HOLEMENU WINAPI OleCreateMenuDescriptor(
 955   HMENU                hmenuCombined,
 956   LPOLEMENUGROUPWIDTHS lpMenuWidths)
 957 {
 958   HOLEMENU hOleMenu;
 959   OleMenuDescriptor *pOleMenuDescriptor;
 960   int i;
 961
 962   if ( !hmenuCombined || !lpMenuWidths )
 963     return 0;
 964
 965   /* Create an OLE menu descriptor */
 966   if ( !(hOleMenu = GlobalAlloc(GMEM_MOVEABLE | GMEM_ZEROINIT,
 967                                 sizeof(OleMenuDescriptor) ) ) )
 968   return 0;
 969
 970   pOleMenuDescriptor = (OleMenuDescriptor *) GlobalLock( hOleMenu );
 971   if ( !pOleMenuDescriptor )
 972     return 0;
 973
 974   /* Initialize menu group widths and hmenu */
 975   for ( i = 0; i < 6; i++ )
 976     pOleMenuDescriptor->mgw.width[i] = lpMenuWidths->width[i];
 977
 978   pOleMenuDescriptor->hmenuCombined = hmenuCombined;
 979   pOleMenuDescriptor->bIsServerItem = FALSE;
 980   GlobalUnlock( hOleMenu );
 981
 982   return hOleMenu;
 983 }
 984
 985 /***********************************************************************
 986  * OleDestroyMenuDescriptor [OLE32.99]
 987  * Destroy the shared menu descriptor
 988  */
 989 HRESULT WINAPI OleDestroyMenuDescriptor(
 990   HOLEMENU hmenuDescriptor)
 991 {
 992   if ( hmenuDescriptor )
 993     GlobalFree( hmenuDescriptor );
 994         return S_OK;
 995 }
 996
 997 /***********************************************************************
 998  * OleSetMenuDescriptor [OLE32.129]
 999  * Installs or removes OLE dispatching code for the containers frame window
1000  * FIXME: The lpFrame and lpActiveObject parameters are currently ignored
1001  * OLE should install context sensitive help F1 filtering for the app when
1002  * these are non null.
1003  *
1004  * PARAMS:
1005  *     hOleMenu         Handle to composite menu descriptor
1006  *     hwndFrame        Handle to containers frame window
1007  *     hwndActiveObject Handle to objects in-place activation window
1008  *     lpFrame          Pointer to IOleInPlaceFrame on containers window
1009  *     lpActiveObject   Pointer to IOleInPlaceActiveObject on active in-place object
1010  *
1011  * RETURNS:
1012  *      S_OK                               - menu installed correctly
1013  *      E_FAIL, E_INVALIDARG, E_UNEXPECTED - failure
1014  */
1015 HRESULT WINAPI OleSetMenuDescriptor(
1016   HOLEMENU               hOleMenu,
1017   HWND                   hwndFrame,
1018   HWND                   hwndActiveObject,
1019   LPOLEINPLACEFRAME        lpFrame,
1020   LPOLEINPLACEACTIVEOBJECT lpActiveObject)
1021 {
1022   OleMenuDescriptor *pOleMenuDescriptor = NULL;
1023
1024   /* Check args */
1025   if ( !hwndFrame || (hOleMenu && !hwndActiveObject) )
1026     return E_INVALIDARG;
1027
1028   if ( lpFrame || lpActiveObject )
1029   {
1030      FIXME(ole,"(%x, %x, %x, %p, %p), Context sensitive help filtering not implemented!\n",
1031         (unsigned int)hOleMenu,
1032         hwndFrame,
1033         hwndActiveObject,
1034         lpFrame,
1035         lpActiveObject);
1036   }
1037
1038   /* Set up a message hook to intercept the containers frame window messages.
1039    * The message filter is responsible for dispatching menu messages from the
1040    * shared menu which are intended for the object.
1041    */
1042
1043   if ( hOleMenu )  /* Want to install dispatching code */
1044   {
1045     /* If OLEMenu hooks are already installed for this thread, fail
1046      * Note: This effectively means that OleSetMenuDescriptor cannot
1047      * be called twice in succession on the same frame window
1048      * without first calling it with a null hOleMenu to uninstall */
1049     if ( OLEMenu_IsHookInstalled( GetCurrentThreadId(), NULL ) )
1050   return E_FAIL;
1051
1052     /* Get the menu descriptor */
1053     pOleMenuDescriptor = (OleMenuDescriptor *) GlobalLock( hOleMenu );
1054     if ( !pOleMenuDescriptor )
1055       return E_UNEXPECTED;
1056
1057     /* Update the menu descriptor */
1058     pOleMenuDescriptor->hwndFrame = hwndFrame;
1059     pOleMenuDescriptor->hwndActiveObject = hwndActiveObject;
1060
1061     GlobalUnlock( hOleMenu );
1062     pOleMenuDescriptor = NULL;
1063
1064     /* Add a menu descriptor windows property to the frame window */
1065     SetPropA( hwndFrame, "PROP_OLEMenuDescriptor", hOleMenu );
1066
1067     /* Install thread scope message hooks for WH_GETMESSAGE and WH_CALLWNDPROC */
1068     if ( !OLEMenu_InstallHooks( GetCurrentThreadId() ) )
1069       return E_FAIL;
1070   }
1071   else  /* Want to uninstall dispatching code */
1072   {
1073     /* Uninstall the hooks */
1074     if ( !OLEMenu_UnInstallHooks( GetCurrentThreadId() ) )
1075       return E_FAIL;
1076
1077     /* Remove the menu descriptor property from the frame window */
1078     RemovePropA( hwndFrame, "PROP_OLEMenuDescriptor" );
1079   }
1080
1081   return S_OK;
1082 }
1083
1084 /***********************************************************************
1085  * ReleaseStgMedium [OLE32.140]
1086  */
1087 void WINAPI ReleaseStgMedium(
1088   STGMEDIUM* pmedium)
1089 {
1090   switch (pmedium->tymed)
1091   {
1092     case TYMED_HGLOBAL:
1093     {
1094       if ( (pmedium->pUnkForRelease==0) &&
1095            (pmedium->u.hGlobal!=0) )
1096         GlobalFree(pmedium->u.hGlobal);
1097
1098       pmedium->u.hGlobal = 0;
1099       break;
1100     }
1101     case TYMED_FILE:
1102     {
1103       if (pmedium->u.lpszFileName!=0)
1104       {
1105         if (pmedium->pUnkForRelease==0)
1106         {
1107           DeleteFileW(pmedium->u.lpszFileName);
1108         }
1109
1110         CoTaskMemFree(pmedium->u.lpszFileName);
1111       }
1112
1113       pmedium->u.lpszFileName = 0;
1114       break;
1115     }
1116     case TYMED_ISTREAM:
1117     {
1118       if (pmedium->u.pstm!=0)
1119       {
1120         IStream_Release(pmedium->u.pstm);
1121       }
1122
1123       pmedium->u.pstm = 0;
1124       break;
1125     }
1126     case TYMED_ISTORAGE:
1127     {
1128       if (pmedium->u.pstg!=0)
1129       {
1130         IStorage_Release(pmedium->u.pstg);
1131       }
1132
1133       pmedium->u.pstg = 0;
1134       break;
1135     }
1136     case TYMED_GDI:
1137     {
1138       if ( (pmedium->pUnkForRelease==0) &&
1139            (pmedium->u.hGlobal!=0) )
1140         DeleteObject(pmedium->u.hGlobal);
1141
1142       pmedium->u.hGlobal = 0;
1143       break;
1144     }
1145     case TYMED_MFPICT:
1146     {
1147       if ( (pmedium->pUnkForRelease==0) &&
1148            (pmedium->u.hMetaFilePict!=0) )
1149       {
1150         DeleteMetaFile(pmedium->u.hMetaFilePict);
1151         GlobalFree(pmedium->u.hMetaFilePict);
1152       }
1153
1154       pmedium->u.hMetaFilePict = 0;
1155       break;
1156     }
1157     case TYMED_ENHMF:
1158     {
1159       if ( (pmedium->pUnkForRelease==0) &&
1160            (pmedium->u.hEnhMetaFile!=0) )
1161       {
1162         DeleteEnhMetaFile(pmedium->u.hEnhMetaFile);
1163       }
1164
1165       pmedium->u.hEnhMetaFile = 0;
1166       break;
1167     }
1168     case TYMED_NULL:
1169     default:
1170       break;
1171   }
1172
1173   /*
1174    * After cleaning up, the unknown is released
1175    */
1176   if (pmedium->pUnkForRelease!=0)
1177   {
1178     IUnknown_Release(pmedium->pUnkForRelease);
1179     pmedium->pUnkForRelease = 0;
1180   }
1181 }
1182
1183 /***
1184  * OLEDD_Initialize()
1185  *
1186  * Initializes the OLE drag and drop data structures.
1187  */
1188 static void OLEDD_Initialize()
1189 {
1190     WNDCLASSA wndClass;
1191
1192     ZeroMemory (&wndClass, sizeof(WNDCLASSA));
1193     wndClass.style         = CS_GLOBALCLASS;
1194     wndClass.lpfnWndProc   = (WNDPROC)OLEDD_DragTrackerWindowProc;
1195     wndClass.cbClsExtra    = 0;
1196     wndClass.cbWndExtra    = sizeof(TrackerWindowInfo*);
1197     wndClass.hCursor       = 0;
1198     wndClass.hbrBackground = 0;
1199     wndClass.lpszClassName = OLEDD_DRAGTRACKERCLASS;
1200
1201     RegisterClassA (&wndClass);
1202 }
1203
1204 /***
1205  * OLEDD_UnInitialize()
1206  *
1207  * Releases the OLE drag and drop data structures.
1208  */
1209 static void OLEDD_UnInitialize()
1210 {
1211   /*
1212    * Simply empty the list.
1213    */
1214   while (targetListHead!=NULL)
1215   {
1216     RevokeDragDrop(targetListHead->hwndTarget);
1217   }
1218 }
1219
1220 /***
1221  * OLEDD_InsertDropTarget()
1222  *
1223  * Insert the target node in the tree.
1224  */
1225 static void OLEDD_InsertDropTarget(DropTargetNode* nodeToAdd)
1226 {
1227   DropTargetNode*  curNode;
1228   DropTargetNode** parentNodeLink;
1229
1230   /*
1231    * Iterate the tree to find the insertion point.
1232    */
1233   curNode        = targetListHead;
1234   parentNodeLink = &targetListHead;
1235
1236   while (curNode!=NULL)
1237   {
1238     if (nodeToAdd->hwndTarget<curNode->hwndTarget)
1239     {
1240       /*
1241        * If the node we want to add has a smaller HWND, go left
1242        */
1243       parentNodeLink = &curNode->prevDropTarget;
1244       curNode        =  curNode->prevDropTarget;
1245     }
1246     else if (nodeToAdd->hwndTarget>curNode->hwndTarget)
1247     {
1248       /*
1249        * If the node we want to add has a larger HWND, go right
1250        */
1251       parentNodeLink = &curNode->nextDropTarget;
1252       curNode        =  curNode->nextDropTarget;
1253     }
1254     else
1255     {
1256       /*
1257        * The item was found in the list. It shouldn't have been there
1258        */
1259       assert(FALSE);
1260       return;
1261     }
1262   }
1263
1264   /*
1265    * If we get here, we have found a spot for our item. The parentNodeLink
1266    * pointer points to the pointer that we have to modify.
1267    * The curNode should be NULL. We just have to establish the link and Voila!
1268    */
1269   assert(curNode==NULL);
1270   assert(parentNodeLink!=NULL);
1271   assert(*parentNodeLink==NULL);
1272
1273   *parentNodeLink=nodeToAdd;
1274 }
1275
1276 /***
1277  * OLEDD_ExtractDropTarget()
1278  *
1279  * Removes the target node from the tree.
1280  */
1281 static DropTargetNode* OLEDD_ExtractDropTarget(HWND hwndOfTarget)
1282 {
1283   DropTargetNode*  curNode;
1284   DropTargetNode** parentNodeLink;
1285
1286   /*
1287    * Iterate the tree to find the insertion point.
1288    */
1289   curNode        = targetListHead;
1290   parentNodeLink = &targetListHead;
1291
1292   while (curNode!=NULL)
1293   {
1294     if (hwndOfTarget<curNode->hwndTarget)
1295     {
1296       /*
1297        * If the node we want to add has a smaller HWND, go left
1298        */
1299       parentNodeLink = &curNode->prevDropTarget;
1300       curNode        =  curNode->prevDropTarget;
1301     }
1302     else if (hwndOfTarget>curNode->hwndTarget)
1303     {
1304       /*
1305        * If the node we want to add has a larger HWND, go right
1306        */
1307       parentNodeLink = &curNode->nextDropTarget;
1308       curNode        =  curNode->nextDropTarget;
1309     }
1310     else
1311     {
1312       /*
1313        * The item was found in the list. Detach it from it's parent and
1314        * re-insert it's kids in the tree.
1315        */
1316       assert(parentNodeLink!=NULL);
1317       assert(*parentNodeLink==curNode);
1318
1319       /*
1320        * We arbitrately re-attach the left sub-tree to the parent.
1321        */
1322       *parentNodeLink = curNode->prevDropTarget;
1323
1324       /*
1325        * And we re-insert the right subtree
1326        */
1327       if (curNode->nextDropTarget!=NULL)
1328       {
1329         OLEDD_InsertDropTarget(curNode->nextDropTarget);
1330       }
1331
1332       /*
1333        * The node we found is still a valid node once we complete
1334        * the unlinking of the kids.
1335        */
1336       curNode->nextDropTarget=NULL;
1337       curNode->prevDropTarget=NULL;
1338
1339       return curNode;
1340     }
1341   }
1342
1343   /*
1344    * If we get here, the node is not in the tree
1345    */
1346   return NULL;
1347 }
1348
1349 /***
1350  * OLEDD_FindDropTarget()
1351  *
1352  * Finds information about the drop target.
1353  */
1354 static DropTargetNode* OLEDD_FindDropTarget(HWND hwndOfTarget)
1355 {
1356   DropTargetNode*  curNode;
1357
1358   /*
1359    * Iterate the tree to find the HWND value.
1360    */
1361   curNode        = targetListHead;
1362
1363   while (curNode!=NULL)
1364   {
1365     if (hwndOfTarget<curNode->hwndTarget)
1366     {
1367       /*
1368        * If the node we want to add has a smaller HWND, go left
1369        */
1370       curNode =  curNode->prevDropTarget;
1371     }
1372     else if (hwndOfTarget>curNode->hwndTarget)
1373     {
1374       /*
1375        * If the node we want to add has a larger HWND, go right
1376        */
1377       curNode =  curNode->nextDropTarget;
1378     }
1379     else
1380     {
1381       /*
1382        * The item was found in the list.
1383        */
1384       return curNode;
1385     }
1386   }
1387
1388   /*
1389    * If we get here, the item is not in the list
1390    */
1391   return NULL;
1392 }
1393
1394 /***
1395  * OLEDD_DragTrackerWindowProc()
1396  *
1397  * This method is the WindowProcedure of the drag n drop tracking
1398  * window. During a drag n Drop operation, an invisible window is created
1399  * to receive the user input and act upon it. This procedure is in charge
1400  * of this behavior.
1401  */
1402 static LRESULT WINAPI OLEDD_DragTrackerWindowProc(
1403                          HWND   hwnd,
1404                          UINT   uMsg,
1405                          WPARAM wParam,
1406                          LPARAM   lParam)
1407 {
1408   switch (uMsg)
1409   {
1410     case WM_CREATE:
1411     {
1412       LPCREATESTRUCTA createStruct = (LPCREATESTRUCTA)lParam;
1413
1414       SetWindowLongA(hwnd, 0, (LONG)createStruct->lpCreateParams);
1415
1416
1417       break;
1418     }
1419     case WM_MOUSEMOVE:
1420     {
1421       TrackerWindowInfo* trackerInfo = (TrackerWindowInfo*)GetWindowLongA(hwnd, 0);
1422       POINT            mousePos;
1423
1424       /*
1425        * Get the current mouse position in screen coordinates.
1426        */
1427       mousePos.x = LOWORD(lParam);
1428       mousePos.y = HIWORD(lParam);
1429       ClientToScreen(hwnd, &mousePos);
1430
1431       /*
1432        * Track the movement of the mouse.
1433        */
1434       OLEDD_TrackMouseMove(trackerInfo, mousePos, wParam);
1435
1436       break;
1437     }
1438     case WM_LBUTTONUP:
1439     case WM_MBUTTONUP:
1440     case WM_RBUTTONUP:
1441     case WM_LBUTTONDOWN:
1442     case WM_MBUTTONDOWN:
1443     case WM_RBUTTONDOWN:
1444     {
1445       TrackerWindowInfo* trackerInfo = (TrackerWindowInfo*)GetWindowLongA(hwnd, 0);
1446       POINT            mousePos;
1447
1448       /*
1449        * Get the current mouse position in screen coordinates.
1450        */
1451       mousePos.x = LOWORD(lParam);
1452       mousePos.y = HIWORD(lParam);
1453       ClientToScreen(hwnd, &mousePos);
1454
1455       /*
1456        * Notify everyone that the button state changed
1457        * TODO: Check if the "escape" key was pressed.
1458        */
1459       OLEDD_TrackStateChange(trackerInfo, mousePos, wParam);
1460
1461       break;
1462     }
1463   }
1464
1465   /*
1466    * This is a window proc after all. Let's call the default.
1467    */
1468   return DefWindowProcA (hwnd, uMsg, wParam, lParam);
1469 }
1470
1471 /***
1472  * OLEDD_TrackMouseMove()
1473  *
1474  * This method is invoked while a drag and drop operation is in effect.
1475  * it will generate the appropriate callbacks in the drop source
1476  * and drop target. It will also provide the expected feedback to
1477  * the user.
1478  *
1479  * params:
1480  *    trackerInfo - Pointer to the structure identifying the
1481  *                  drag & drop operation that is currently
1482  *                  active.
1483  *    mousePos    - Current position of the mouse in screen
1484  *                  coordinates.
1485  *    keyState    - Contains the state of the shift keys and the
1486  *                  mouse buttons (MK_LBUTTON and the like)
1487  */
1488 static void OLEDD_TrackMouseMove(
1489   TrackerWindowInfo* trackerInfo,
1490   POINT            mousePos,
1491   DWORD              keyState)
1492 {
1493   HWND   hwndNewTarget = 0;
1494   HRESULT  hr = S_OK;
1495
1496   /*
1497    * Get the handle of the window under the mouse
1498    */
1499   hwndNewTarget = WindowFromPoint(mousePos);
1500
1501   /*
1502    * If we are hovering over the same target as before, send the
1503    * DragOver notification
1504    */
1505   if ( (trackerInfo->curDragTarget != 0) &&
1506        (trackerInfo->curDragTargetHWND==hwndNewTarget) )
1507   {
1508     POINTL  mousePosParam;
1509
1510     /*
1511      * The documentation tells me that the coordinate should be in the target
1512      * window's coordinate space. However, the tests I made tell me the
1513      * coordinates should be in screen coordinates.
1514      */
1515     mousePosParam.x = mousePos.x;
1516     mousePosParam.y = mousePos.y;
1517
1518     IDropTarget_DragOver(trackerInfo->curDragTarget,
1519                          keyState,
1520                          mousePosParam,
1521                          trackerInfo->pdwEffect);
1522   }
1523   else
1524 {
1525     DropTargetNode* newDropTargetNode = 0;
1526
1527     /*
1528      * If we changed window, we have to notify our old target and check for
1529      * the new one.
1530      */
1531     if (trackerInfo->curDragTarget!=0)
1532     {
1533       IDropTarget_DragLeave(trackerInfo->curDragTarget);
1534     }
1535
1536     /*
1537      * Make sure we're hovering over a window.
1538      */
1539     if (hwndNewTarget!=0)
1540     {
1541       /*
1542        * Find-out if there is a drag target under the mouse
1543        */
1544       newDropTargetNode = OLEDD_FindDropTarget(hwndNewTarget);
1545
1546       trackerInfo->curDragTargetHWND = hwndNewTarget;
1547       trackerInfo->curDragTarget     = newDropTargetNode ? newDropTargetNode->dropTarget : 0;
1548
1549       /*
1550        * If there is, notify it that we just dragged-in
1551        */
1552       if (trackerInfo->curDragTarget!=0)
1553       {
1554         POINTL  mousePosParam;
1555
1556         /*
1557          * The documentation tells me that the coordinate should be in the target
1558          * window's coordinate space. However, the tests I made tell me the
1559          * coordinates should be in screen coordinates.
1560          */
1561         mousePosParam.x = mousePos.x;
1562         mousePosParam.y = mousePos.y;
1563
1564         IDropTarget_DragEnter(trackerInfo->curDragTarget,
1565                               trackerInfo->dataObject,
1566                               keyState,
1567                               mousePosParam,
1568                               trackerInfo->pdwEffect);
1569       }
1570     }
1571     else
1572     {
1573       /*
1574        * The mouse is not over a window so we don't track anything.
1575        */
1576       trackerInfo->curDragTargetHWND = 0;
1577       trackerInfo->curDragTarget     = 0;
1578     }
1579   }
1580
1581   /*
1582    * Now that we have done that, we have to tell the source to give
1583    * us feedback on the work being done by the target.  If we don't
1584    * have a target, simulate no effect.
1585    */
1586   if (trackerInfo->curDragTarget==0)
1587   {
1588     *trackerInfo->pdwEffect = DROPEFFECT_NONE;
1589   }
1590
1591   hr = IDropSource_GiveFeedback(trackerInfo->dropSource,
1592                                 *trackerInfo->pdwEffect);
1593
1594   /*
1595    * When we ask for feedback from the drop source, sometimes it will
1596    * do all the necessary work and sometimes it will not handle it
1597    * when that's the case, we must display the standard drag and drop
1598    * cursors.
1599    */
1600   if (hr==DRAGDROP_S_USEDEFAULTCURSORS)
1601   {
1602     if ( (*trackerInfo->pdwEffect & DROPEFFECT_MOVE) ||
1603          (*trackerInfo->pdwEffect & DROPEFFECT_COPY) ||
1604          (*trackerInfo->pdwEffect & DROPEFFECT_LINK) )
1605     {
1606       SetCursor(LoadCursorA(0, IDC_SIZEALLA));
1607     }
1608     else
1609     {
1610       SetCursor(LoadCursorA(0, IDC_NOA));
1611     }
1612   }
1613 }
1614
1615 /***
1616  * OLEDD_TrackStateChange()
1617  *
1618  * This method is invoked while a drag and drop operation is in effect.
1619  * It is used to notify the drop target/drop source callbacks when
1620  * the state of the keyboard or mouse button change.
1621  *
1622  * params:
1623  *    trackerInfo - Pointer to the structure identifying the
1624  *                  drag & drop operation that is currently
1625  *                  active.
1626  *    mousePos    - Current position of the mouse in screen
1627  *                  coordinates.
1628  *    keyState    - Contains the state of the shift keys and the
1629  *                  mouse buttons (MK_LBUTTON and the like)
1630  */
1631 static void OLEDD_TrackStateChange(
1632   TrackerWindowInfo* trackerInfo,
1633   POINT            mousePos,
1634   DWORD              keyState)
1635 {
1636   /*
1637    * Ask the drop source what to do with the operation.
1638    */
1639   trackerInfo->returnValue = IDropSource_QueryContinueDrag(
1640                                trackerInfo->dropSource,
1641                                trackerInfo->escPressed,
1642                                keyState);
1643
1644   /*
1645    * All the return valued will stop the operation except the S_OK
1646    * return value.
1647    */
1648   if (trackerInfo->returnValue!=S_OK)
1649   {
1650     /*
1651      * Make sure the message loop in DoDragDrop stops
1652      */
1653     trackerInfo->trackingDone = TRUE;
1654
1655     /*
1656      * Release the mouse in case the drop target decides to show a popup
1657      * or a menu or something.
1658      */
1659     ReleaseCapture();
1660
1661     /*
1662      * If we end-up over a target, drop the object in the target or
1663      * inform the target that the operation was cancelled.
1664      */
1665     if (trackerInfo->curDragTarget!=0)
1666     {
1667       switch (trackerInfo->returnValue)
1668       {
1669         /*
1670          * If the source wants us to complete the operation, we tell
1671          * the drop target that we just dropped the object in it.
1672          */
1673         case DRAGDROP_S_DROP:
1674         {
1675           POINTL  mousePosParam;
1676
1677           /*
1678            * The documentation tells me that the coordinate should be
1679            * in the target window's coordinate space. However, the tests
1680            * I made tell me the coordinates should be in screen coordinates.
1681            */
1682           mousePosParam.x = mousePos.x;
1683           mousePosParam.y = mousePos.y;
1684
1685           IDropTarget_Drop(trackerInfo->curDragTarget,
1686                            trackerInfo->dataObject,
1687                            keyState,
1688                            mousePosParam,
1689                            trackerInfo->pdwEffect);
1690           break;
1691         }
1692         /*
1693          * If the source told us that we should cancel, fool the drop
1694          * target by telling it that the mouse left it's window.
1695          */
1696         case DRAGDROP_S_CANCEL:
1697           IDropTarget_DragLeave(trackerInfo->curDragTarget);
1698           break;
1699       }
1700     }
1701   }
1702 }
1703
1704 /***
1705  * OLEDD_GetButtonState()
1706  *
1707  * This method will use the current state of the keyboard to build
1708  * a button state mask equivalent to the one passed in the
1709  * WM_MOUSEMOVE wParam.
1710  */
1711 static DWORD OLEDD_GetButtonState()
1712 {
1713   BYTE  keyboardState[256];
1714   DWORD keyMask = 0;
1715
1716   GetKeyboardState(keyboardState);
1717
1718   if ( (keyboardState[VK_SHIFT] & 0x80) !=0)
1719     keyMask |= MK_SHIFT;
1720
1721   if ( (keyboardState[VK_CONTROL] & 0x80) !=0)
1722     keyMask |= MK_CONTROL;
1723
1724   if ( (keyboardState[VK_LBUTTON] & 0x80) !=0)
1725     keyMask |= MK_LBUTTON;
1726
1727   if ( (keyboardState[VK_RBUTTON] & 0x80) !=0)
1728     keyMask |= MK_RBUTTON;
1729
1730   if ( (keyboardState[VK_MBUTTON] & 0x80) !=0)
1731     keyMask |= MK_MBUTTON;
1732
1733   return keyMask;
1734 }
1735
1736