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/*
* OLE2 library
*
* Copyright 1995 Martin von Loewis
* Copyright 1999 Francis Beaudet
*/
#include <assert.h>
#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->hwndTarget<curNode->hwndTarget)
{
/*
* 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 (hwndOfTarget<curNode->hwndTarget)
{
/*
* 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 (hwndOfTarget<curNode->hwndTarget)
{
/*
* 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;
}
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