/* * OLE2 library * * Copyright 1995 Martin von Loewis * Copyright 1999 Francis Beaudet */ #include #include "winuser.h" #include "winerror.h" #include "ole2.h" #include "process.h" #include "wine/obj_clientserver.h" #include "debug.h" /****************************************************************************** * These are static/global variables and internal data structures that the * OLE module uses to maintain it's state. */ typedef struct tagDropTargetNode { HWND hwndTarget; IDropTarget* dropTarget; struct tagDropTargetNode* prevDropTarget; struct tagDropTargetNode* nextDropTarget; } DropTargetNode; typedef struct tagTrackerWindowInfo { IDataObject* dataObject; IDropSource* dropSource; DWORD dwOKEffect; DWORD* pdwEffect; BOOL trackingDone; HRESULT returnValue; BOOL escPressed; HWND curDragTargetHWND; IDropTarget* curDragTarget; } TrackerWindowInfo; /* * This is the lock count on the OLE library. It is controlled by the * OLEInitialize/OLEUninitialize methods. */ static ULONG OLE_moduleLockCount = 0; /* * Name of our registered window class. */ static const char OLEDD_DRAGTRACKERCLASS[] = "WineDragDropTracker32"; /* * This is the head of the Drop target container. */ static DropTargetNode* targetListHead = NULL; /****************************************************************************** * These are the prototypes of the utility methods used for OLE Drag n Drop */ static void OLEDD_Initialize(); static void OLEDD_UnInitialize(); static void OLEDD_InsertDropTarget( DropTargetNode* nodeToAdd); static DropTargetNode* OLEDD_ExtractDropTarget( HWND hwndOfTarget); static DropTargetNode* OLEDD_FindDropTarget( HWND hwndOfTarget); static LRESULT WINAPI OLEDD_DragTrackerWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam); static void OLEDD_TrackMouseMove( TrackerWindowInfo* trackerInfo, POINT mousePos, DWORD keyState); static void OLEDD_TrackStateChange( TrackerWindowInfo* trackerInfo, POINT mousePos, DWORD keyState); static DWORD OLEDD_GetButtonState(); /****************************************************************************** * OleBuildVersion [OLE2.1] */ DWORD WINAPI OleBuildVersion(void) { TRACE(ole,"(void)\n"); return (rmm<<16)+rup; } /*********************************************************************** * OleInitialize (OLE2.2) (OLE32.108) */ HRESULT WINAPI OleInitialize(LPVOID reserved) { HRESULT hr; TRACE(ole, "(%p)\n", reserved); /* * The first duty of the OleInitialize is to initialize the COM libraries. */ hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED); /* * If the CoInitializeEx call failed, the OLE libraries can't be * initialized. */ if (FAILED(hr)) return hr; /* * Then, it has to initialize the OLE specific modules. * This includes: * Clipboard * Drag and Drop * Object linking and Embedding * In-place activation */ if (OLE_moduleLockCount==0) { /* * Initialize the libraries. */ TRACE(ole, "() - Initializing the OLE libraries\n"); /* * Drag and Drop */ OLEDD_Initialize(); } /* * Then, we increase the lock count on the OLE module. */ OLE_moduleLockCount++; return hr; } /****************************************************************************** * CoGetCurrentProcess [COMPOBJ.34] [OLE2.2][OLE32.108] * * NOTES * Is DWORD really the correct return type for this function? */ DWORD WINAPI CoGetCurrentProcess(void) { return (DWORD)PROCESS_Current(); } /****************************************************************************** * OleUninitialize [OLE2.3] [OLE32.131] */ void WINAPI OleUninitialize(void) { TRACE(ole, "()\n"); /* * Decrease the lock count on the OLE module. */ OLE_moduleLockCount--; /* * If we hit the bottom of the lock stack, free the libraries. */ if (OLE_moduleLockCount==0) { /* * Actually free the libraries. */ TRACE(ole, "() - Freeing the last reference count\n"); /* * Drag and Drop */ OLEDD_UnInitialize(); } /* * Then, uninitialize the COM libraries. */ CoUninitialize(); } /*********************************************************************** * OleFlushClipboard [OLE2.76] */ HRESULT WINAPI OleFlushClipboard16(void) { return S_OK; } /*********************************************************************** * OleSetClipboard [OLE32.127] */ HRESULT WINAPI OleSetClipboard(LPVOID pDataObj) { FIXME(ole,"(%p), stub!\n", pDataObj); return S_OK; } /****************************************************************************** * CoRegisterMessageFilter32 [OLE32.38] */ HRESULT WINAPI CoRegisterMessageFilter( LPMESSAGEFILTER lpMessageFilter, /* Pointer to interface */ LPMESSAGEFILTER *lplpMessageFilter /* Indirect pointer to prior instance if non-NULL */ ) { FIXME(ole,"stub\n"); if (lplpMessageFilter) { *lplpMessageFilter = NULL; } return S_OK; } /****************************************************************************** * OleInitializeWOW [OLE32.109] */ HRESULT WINAPI OleInitializeWOW(DWORD x) { FIXME(ole,"(0x%08lx),stub!\n",x); return 0; } /*********************************************************************** * RegisterDragDrop16 (OLE2.35) */ HRESULT WINAPI RegisterDragDrop16( HWND16 hwnd, LPDROPTARGET pDropTarget ) { FIXME(ole,"(0x%04x,%p),stub!\n",hwnd,pDropTarget); return S_OK; } /*********************************************************************** * RegisterDragDrop32 (OLE32.139) */ HRESULT WINAPI RegisterDragDrop( HWND hwnd, LPDROPTARGET pDropTarget) { DropTargetNode* dropTargetInfo; TRACE(ole,"(0x%x,%p)\n", hwnd, pDropTarget); /* * First, check if the window is already registered. */ dropTargetInfo = OLEDD_FindDropTarget(hwnd); if (dropTargetInfo!=NULL) return DRAGDROP_E_ALREADYREGISTERED; /* * If it's not there, we can add it. We first create a node for it. */ dropTargetInfo = HeapAlloc(GetProcessHeap(), 0, sizeof(DropTargetNode)); if (dropTargetInfo==NULL) return E_OUTOFMEMORY; dropTargetInfo->hwndTarget = hwnd; dropTargetInfo->prevDropTarget = NULL; dropTargetInfo->nextDropTarget = NULL; /* * Don't forget that this is an interface pointer, need to nail it down since * we keep a copy of it. */ dropTargetInfo->dropTarget = pDropTarget; IDropTarget_AddRef(dropTargetInfo->dropTarget); OLEDD_InsertDropTarget(dropTargetInfo); return S_OK; } /*********************************************************************** * RevokeDragDrop16 (OLE2.36) */ HRESULT WINAPI RevokeDragDrop16( HWND16 hwnd ) { FIXME(ole,"(0x%04x),stub!\n",hwnd); return S_OK; } /*********************************************************************** * RevokeDragDrop32 (OLE32.141) */ HRESULT WINAPI RevokeDragDrop( HWND hwnd) { DropTargetNode* dropTargetInfo; TRACE(ole,"(0x%x)\n", hwnd); /* * First, check if the window is already registered. */ dropTargetInfo = OLEDD_ExtractDropTarget(hwnd); /* * If it ain't in there, it's an error. */ if (dropTargetInfo==NULL) return DRAGDROP_E_NOTREGISTERED; /* * If it's in there, clean-up it's used memory and * references */ IDropTarget_Release(dropTargetInfo->dropTarget); HeapFree(GetProcessHeap(), 0, dropTargetInfo); return S_OK; } /*********************************************************************** * OleRegGetUserType (OLE32.122) */ HRESULT WINAPI OleRegGetUserType( REFCLSID clsid, DWORD dwFormOfType, LPOLESTR* pszUserType) { FIXME(ole,",stub!\n"); return S_OK; } /*********************************************************************** * DoDragDrop32 [OLE32.65] */ HRESULT WINAPI DoDragDrop ( IDataObject *pDataObject, /* ptr to the data obj */ IDropSource* pDropSource, /* ptr to the source obj */ DWORD dwOKEffect, /* effects allowed by the source */ DWORD *pdwEffect) /* ptr to effects of the source */ { TrackerWindowInfo trackerInfo; HWND hwndTrackWindow; MSG msg; TRACE(ole,"(DataObject %p, DropSource %p)\n", pDataObject, pDropSource); /* * Setup the drag n drop tracking window. */ trackerInfo.dataObject = pDataObject; trackerInfo.dropSource = pDropSource; trackerInfo.dwOKEffect = dwOKEffect; trackerInfo.pdwEffect = pdwEffect; trackerInfo.trackingDone = FALSE; trackerInfo.escPressed = FALSE; trackerInfo.curDragTargetHWND = 0; trackerInfo.curDragTarget = 0; hwndTrackWindow = CreateWindowA(OLEDD_DRAGTRACKERCLASS, "TrackerWindow", WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, 0, (LPVOID)&trackerInfo); if (hwndTrackWindow!=0) { /* * Capture the mouse input */ SetCapture(hwndTrackWindow); /* * Pump messages. All mouse input should go the the capture window. */ while (!trackerInfo.trackingDone && GetMessageA(&msg, 0, 0, 0) ) { if ( (msg.message >= WM_KEYFIRST) && (msg.message <= WM_KEYFIRST) ) { /* * When keyboard messages are sent to windows on this thread, we * want to ignore notify the drop source that the state changed. * in the case of the Escape key, we also notify the drop source * we give it a special meaning. */ if ( (msg.message==WM_KEYDOWN) && (msg.wParam==VK_ESCAPE) ) { trackerInfo.escPressed = TRUE; } /* * Notify the drop source. */ OLEDD_TrackStateChange(&trackerInfo, msg.pt, OLEDD_GetButtonState()); } else { /* * Dispatch the messages only when it's not a keyboard message. */ DispatchMessageA(&msg); } } /* * Destroy the temporary window. */ DestroyWindow(hwndTrackWindow); return trackerInfo.returnValue; } return E_FAIL; } /*********************************************************************** * OleQueryLinkFromData32 [OLE32.118] */ HRESULT WINAPI OleQueryLinkFromData32( IDataObject* pSrcDataObject) { FIXME(ole,"(%p),stub!\n", pSrcDataObject); return S_OK; } /*********************************************************************** * OleRegGetMiscStatus32 [OLE32.121] */ HRESULT WINAPI OleRegGetMiscStatus32( REFCLSID clsid, DWORD dwAspect, DWORD* pdwStatus) { FIXME(ole,"(),stub!\n"); return REGDB_E_CLASSNOTREG; } /*********************************************************************** * OleGetClipboard32 [OLE32.105] */ HRESULT WINAPI OleGetClipboard32( IDataObject** ppDataObj) { FIXME(ole,"(%p),stub!\n", ppDataObj); if (ppDataObj) *ppDataObj=0; return E_FAIL; } /*********************************************************************** * OleCreateMenuDescriptor [OLE32.97] */ HOLEMENU WINAPI OleCreateMenuDescriptor( HMENU hmenuCombined, LPOLEMENUGROUPWIDTHS lpMenuWidths) { FIXME(ole,"(%x,%p),stub!\n", hmenuCombined, lpMenuWidths); return NULL; } /*********************************************************************** * OleDestroyMenuDescriptor [OLE32.99] */ void WINAPI OleDestroyMenuDescriptor( HOLEMENU hmenuDescriptor) { FIXME(ole,"(%x),stub!\n", (unsigned int)hmenuDescriptor); } /*********************************************************************** * OleSetMenuDescriptor [OLE32.129] */ HRESULT WINAPI OleSetMenuDescriptor( HOLEMENU hmenuDescriptor, HWND hwndFrame, HWND hwndActiveObject, LPOLEINPLACEFRAME lpFrame, LPOLEINPLACEACTIVEOBJECT lpActiveObject) { FIXME(ole,"(%x, %x, %x, %p, %p),stub!\n", (unsigned int)hmenuDescriptor, hwndFrame, hwndActiveObject, lpFrame, lpActiveObject); return E_FAIL; } /*********************************************************************** * ReleaseStgMedium [OLE32.140] */ void WINAPI ReleaseStgMedium( STGMEDIUM* pmedium) { switch (pmedium->tymed) { case TYMED_HGLOBAL: { if ( (pmedium->pUnkForRelease==0) && (pmedium->u.hGlobal!=0) ) GlobalFree(pmedium->u.hGlobal); pmedium->u.hGlobal = 0; break; } case TYMED_FILE: { if (pmedium->u.lpszFileName!=0) { if (pmedium->pUnkForRelease==0) { DeleteFileW(pmedium->u.lpszFileName); } CoTaskMemFree(pmedium->u.lpszFileName); } pmedium->u.lpszFileName = 0; break; } case TYMED_ISTREAM: { if (pmedium->u.pstm!=0) { IStream_Release(pmedium->u.pstm); } pmedium->u.pstm = 0; break; } case TYMED_ISTORAGE: { if (pmedium->u.pstg!=0) { IStorage_Release(pmedium->u.pstg); } pmedium->u.pstg = 0; break; } case TYMED_GDI: { if ( (pmedium->pUnkForRelease==0) && (pmedium->u.hGlobal!=0) ) DeleteObject(pmedium->u.hGlobal); pmedium->u.hGlobal = 0; break; } case TYMED_MFPICT: { if ( (pmedium->pUnkForRelease==0) && (pmedium->u.hMetaFilePict!=0) ) { DeleteMetaFile(pmedium->u.hMetaFilePict); GlobalFree(pmedium->u.hMetaFilePict); } pmedium->u.hMetaFilePict = 0; break; } case TYMED_ENHMF: { if ( (pmedium->pUnkForRelease==0) && (pmedium->u.hEnhMetaFile!=0) ) { DeleteEnhMetaFile(pmedium->u.hEnhMetaFile); } pmedium->u.hEnhMetaFile = 0; break; } case TYMED_NULL: default: break; } /* * After cleaning up, the unknown is released */ if (pmedium->pUnkForRelease!=0) { IUnknown_Release(pmedium->pUnkForRelease); pmedium->pUnkForRelease = 0; } } /*** * OLEDD_Initialize() * * Initializes the OLE drag and drop data structures. */ static void OLEDD_Initialize() { WNDCLASSA wndClass; ZeroMemory (&wndClass, sizeof(WNDCLASSA)); wndClass.style = CS_GLOBALCLASS; wndClass.lpfnWndProc = (WNDPROC)OLEDD_DragTrackerWindowProc; wndClass.cbClsExtra = 0; wndClass.cbWndExtra = sizeof(TrackerWindowInfo*); wndClass.hCursor = 0; wndClass.hbrBackground = 0; wndClass.lpszClassName = OLEDD_DRAGTRACKERCLASS; RegisterClassA (&wndClass); } /*** * OLEDD_UnInitialize() * * Releases the OLE drag and drop data structures. */ static void OLEDD_UnInitialize() { /* * Simply empty the list. */ while (targetListHead!=NULL) { RevokeDragDrop(targetListHead->hwndTarget); } } /*** * OLEDD_InsertDropTarget() * * Insert the target node in the tree. */ static void OLEDD_InsertDropTarget(DropTargetNode* nodeToAdd) { DropTargetNode* curNode; DropTargetNode** parentNodeLink; /* * Iterate the tree to find the insertion point. */ curNode = targetListHead; parentNodeLink = &targetListHead; while (curNode!=NULL) { if (nodeToAdd->hwndTargethwndTarget) { /* * If the node we want to add has a smaller HWND, go left */ parentNodeLink = &curNode->prevDropTarget; curNode = curNode->prevDropTarget; } else if (nodeToAdd->hwndTarget>curNode->hwndTarget) { /* * If the node we want to add has a larger HWND, go right */ parentNodeLink = &curNode->nextDropTarget; curNode = curNode->nextDropTarget; } else { /* * The item was found in the list. It shouldn't have been there */ assert(FALSE); return; } } /* * If we get here, we have found a spot for our item. The parentNodeLink * pointer points to the pointer that we have to modify. * The curNode should be NULL. We just have to establish the link and Voila! */ assert(curNode==NULL); assert(parentNodeLink!=NULL); assert(*parentNodeLink==NULL); *parentNodeLink=nodeToAdd; } /*** * OLEDD_ExtractDropTarget() * * Removes the target node from the tree. */ static DropTargetNode* OLEDD_ExtractDropTarget(HWND hwndOfTarget) { DropTargetNode* curNode; DropTargetNode** parentNodeLink; /* * Iterate the tree to find the insertion point. */ curNode = targetListHead; parentNodeLink = &targetListHead; while (curNode!=NULL) { if (hwndOfTargethwndTarget) { /* * If the node we want to add has a smaller HWND, go left */ parentNodeLink = &curNode->prevDropTarget; curNode = curNode->prevDropTarget; } else if (hwndOfTarget>curNode->hwndTarget) { /* * If the node we want to add has a larger HWND, go right */ parentNodeLink = &curNode->nextDropTarget; curNode = curNode->nextDropTarget; } else { /* * The item was found in the list. Detach it from it's parent and * re-insert it's kids in the tree. */ assert(parentNodeLink!=NULL); assert(*parentNodeLink==curNode); /* * We arbitrately re-attach the left sub-tree to the parent. */ *parentNodeLink = curNode->prevDropTarget; /* * And we re-insert the right subtree */ if (curNode->nextDropTarget!=NULL) { OLEDD_InsertDropTarget(curNode->nextDropTarget); } /* * The node we found is still a valid node once we complete * the unlinking of the kids. */ curNode->nextDropTarget=NULL; curNode->prevDropTarget=NULL; return curNode; } } /* * If we get here, the node is not in the tree */ return NULL; } /*** * OLEDD_FindDropTarget() * * Finds information about the drop target. */ static DropTargetNode* OLEDD_FindDropTarget(HWND hwndOfTarget) { DropTargetNode* curNode; /* * Iterate the tree to find the HWND value. */ curNode = targetListHead; while (curNode!=NULL) { if (hwndOfTargethwndTarget) { /* * If the node we want to add has a smaller HWND, go left */ curNode = curNode->prevDropTarget; } else if (hwndOfTarget>curNode->hwndTarget) { /* * If the node we want to add has a larger HWND, go right */ curNode = curNode->nextDropTarget; } else { /* * The item was found in the list. */ return curNode; } } /* * If we get here, the item is not in the list */ return NULL; } /*** * OLEDD_DragTrackerWindowProc() * * This method is the WindowProcedure of the drag n drop tracking * window. During a drag n Drop operation, an invisible window is created * to receive the user input and act upon it. This procedure is in charge * of this behavior. */ static LRESULT WINAPI OLEDD_DragTrackerWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch (uMsg) { case WM_CREATE: { LPCREATESTRUCTA createStruct = (LPCREATESTRUCTA)lParam; SetWindowLongA(hwnd, 0, (LONG)createStruct->lpCreateParams); break; } case WM_MOUSEMOVE: { TrackerWindowInfo* trackerInfo = (TrackerWindowInfo*)GetWindowLongA(hwnd, 0); POINT mousePos; /* * Get the current mouse position in screen coordinates. */ mousePos.x = LOWORD(lParam); mousePos.y = HIWORD(lParam); ClientToScreen(hwnd, &mousePos); /* * Track the movement of the mouse. */ OLEDD_TrackMouseMove(trackerInfo, mousePos, wParam); break; } case WM_LBUTTONUP: case WM_MBUTTONUP: case WM_RBUTTONUP: case WM_LBUTTONDOWN: case WM_MBUTTONDOWN: case WM_RBUTTONDOWN: { TrackerWindowInfo* trackerInfo = (TrackerWindowInfo*)GetWindowLongA(hwnd, 0); POINT mousePos; /* * Get the current mouse position in screen coordinates. */ mousePos.x = LOWORD(lParam); mousePos.y = HIWORD(lParam); ClientToScreen(hwnd, &mousePos); /* * Notify everyone that the button state changed * TODO: Check if the "escape" key was pressed. */ OLEDD_TrackStateChange(trackerInfo, mousePos, wParam); break; } } /* * This is a window proc after all. Let's call the default. */ return DefWindowProcA (hwnd, uMsg, wParam, lParam); } /*** * OLEDD_TrackMouseMove() * * This method is invoked while a drag and drop operation is in effect. * it will generate the appropriate callbacks in the drop source * and drop target. It will also provide the expected feedback to * the user. * * params: * trackerInfo - Pointer to the structure identifying the * drag & drop operation that is currently * active. * mousePos - Current position of the mouse in screen * coordinates. * keyState - Contains the state of the shift keys and the * mouse buttons (MK_LBUTTON and the like) */ static void OLEDD_TrackMouseMove( TrackerWindowInfo* trackerInfo, POINT mousePos, DWORD keyState) { HWND hwndNewTarget = 0; HRESULT hr = S_OK; /* * Get the handle of the window under the mouse */ hwndNewTarget = WindowFromPoint(mousePos); /* * If we are hovering over the same target as before, send the * DragOver notification */ if ( (trackerInfo->curDragTarget != 0) && (trackerInfo->curDragTargetHWND==hwndNewTarget) ) { POINTL mousePosParam; /* * The documentation tells me that the coordinate should be in the target * window's coordinate space. However, the tests I made tell me the * coordinates should be in screen coordinates. */ mousePosParam.x = mousePos.x; mousePosParam.y = mousePos.y; IDropTarget_DragOver(trackerInfo->curDragTarget, keyState, mousePosParam, trackerInfo->pdwEffect); } else { DropTargetNode* newDropTargetNode = 0; /* * If we changed window, we have to notify our old target and check for * the new one. */ if (trackerInfo->curDragTarget!=0) { IDropTarget_DragLeave(trackerInfo->curDragTarget); } /* * Make sure we're hovering over a window. */ if (hwndNewTarget!=0) { /* * Find-out if there is a drag target under the mouse */ newDropTargetNode = OLEDD_FindDropTarget(hwndNewTarget); trackerInfo->curDragTargetHWND = hwndNewTarget; trackerInfo->curDragTarget = newDropTargetNode ? newDropTargetNode->dropTarget : 0; /* * If there is, notify it that we just dragged-in */ if (trackerInfo->curDragTarget!=0) { POINTL mousePosParam; /* * The documentation tells me that the coordinate should be in the target * window's coordinate space. However, the tests I made tell me the * coordinates should be in screen coordinates. */ mousePosParam.x = mousePos.x; mousePosParam.y = mousePos.y; IDropTarget_DragEnter(trackerInfo->curDragTarget, trackerInfo->dataObject, keyState, mousePosParam, trackerInfo->pdwEffect); } } else { /* * The mouse is not over a window so we don't track anything. */ trackerInfo->curDragTargetHWND = 0; trackerInfo->curDragTarget = 0; } } /* * Now that we have done that, we have to tell the source to give * us feedback on the work being done by the target. If we don't * have a target, simulate no effect. */ if (trackerInfo->curDragTarget==0) { *trackerInfo->pdwEffect = DROPEFFECT_NONE; } hr = IDropSource_GiveFeedback(trackerInfo->dropSource, *trackerInfo->pdwEffect); /* * When we ask for feedback from the drop source, sometimes it will * do all the necessary work and sometimes it will not handle it * when that's the case, we must display the standard drag and drop * cursors. */ if (hr==DRAGDROP_S_USEDEFAULTCURSORS) { if ( (*trackerInfo->pdwEffect & DROPEFFECT_MOVE) || (*trackerInfo->pdwEffect & DROPEFFECT_COPY) || (*trackerInfo->pdwEffect & DROPEFFECT_LINK) ) { SetCursor(LoadCursorA(0, IDC_SIZEALLA)); } else { SetCursor(LoadCursorA(0, IDC_NOA)); } } } /*** * OLEDD_TrackStateChange() * * This method is invoked while a drag and drop operation is in effect. * It is used to notify the drop target/drop source callbacks when * the state of the keyboard or mouse button change. * * params: * trackerInfo - Pointer to the structure identifying the * drag & drop operation that is currently * active. * mousePos - Current position of the mouse in screen * coordinates. * keyState - Contains the state of the shift keys and the * mouse buttons (MK_LBUTTON and the like) */ static void OLEDD_TrackStateChange( TrackerWindowInfo* trackerInfo, POINT mousePos, DWORD keyState) { /* * Ask the drop source what to do with the operation. */ trackerInfo->returnValue = IDropSource_QueryContinueDrag( trackerInfo->dropSource, trackerInfo->escPressed, keyState); /* * All the return valued will stop the operation except the S_OK * return value. */ if (trackerInfo->returnValue!=S_OK) { /* * Make sure the message loop in DoDragDrop stops */ trackerInfo->trackingDone = TRUE; /* * Release the mouse in case the drop target decides to show a popup * or a menu or something. */ ReleaseCapture(); /* * If we end-up over a target, drop the object in the target or * inform the target that the operation was cancelled. */ if (trackerInfo->curDragTarget!=0) { switch (trackerInfo->returnValue) { /* * If the source wants us to complete the operation, we tell * the drop target that we just dropped the object in it. */ case DRAGDROP_S_DROP: { POINTL mousePosParam; /* * The documentation tells me that the coordinate should be * in the target window's coordinate space. However, the tests * I made tell me the coordinates should be in screen coordinates. */ mousePosParam.x = mousePos.x; mousePosParam.y = mousePos.y; IDropTarget_Drop(trackerInfo->curDragTarget, trackerInfo->dataObject, keyState, mousePosParam, trackerInfo->pdwEffect); break; } /* * If the source told us that we should cancel, fool the drop * target by telling it that the mouse left it's window. */ case DRAGDROP_S_CANCEL: IDropTarget_DragLeave(trackerInfo->curDragTarget); break; } } } } /*** * OLEDD_GetButtonState() * * This method will use the current state of the keyboard to build * a button state mask equivalent to the one passed in the * WM_MOUSEMOVE wParam. */ static DWORD OLEDD_GetButtonState() { BYTE keyboardState[256]; DWORD keyMask = 0; GetKeyboardState(keyboardState); if ( (keyboardState[VK_SHIFT] & 0x80) !=0) keyMask |= MK_SHIFT; if ( (keyboardState[VK_CONTROL] & 0x80) !=0) keyMask |= MK_CONTROL; if ( (keyboardState[VK_LBUTTON] & 0x80) !=0) keyMask |= MK_LBUTTON; if ( (keyboardState[VK_RBUTTON] & 0x80) !=0) keyMask |= MK_RBUTTON; if ( (keyboardState[VK_MBUTTON] & 0x80) !=0) keyMask |= MK_MBUTTON; return keyMask; }