337 lines
10 KiB
C++
337 lines
10 KiB
C++
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//+---------------------------------------------------------------------
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//
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// File: dvutils.cxx
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//
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// Contents: Helper functions for implementing IDataObject and IViewObject
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//
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//----------------------------------------------------------------------
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#include "headers.hxx"
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#pragma hdrstop
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//
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// Globals
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//
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UINT OleClipFormat[OCF_LAST+1]; // array of OLE standard clipboard formats
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// these are the names of the standard OLE clipboard formats that need to
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// be registered.
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LPTSTR OleClipNames[OCF_LAST+1] =
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{
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TEXT("ObjectLink"),
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TEXT("OwnerLink"),
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TEXT("Native"),
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TEXT("FileName"),
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TEXT("NetworkName"),
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TEXT("DataObject"),
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TEXT("Embedded Object"),
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TEXT("Embed Source"),
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TEXT("Link Source"),
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TEXT("Link Source Descriptor"),
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TEXT("Object Descriptor"),
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TEXT("OleDraw")
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};
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//+---------------------------------------------------------------
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//
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// Function: RegisterOleClipFormats
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//
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// Synopsis: Initializes the OleClipFormat table of standard
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// OLE clipboard formats.
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//
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// Notes: The OleClipFormat table is a table of registered,
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// standard, OLE-related clipboard formats. The table
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// is indexed by the OLECLIPFORMAT enumeration.
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// Before this table can be used it must be initialized
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// via this function.
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// This function is usually called in the WinMain or
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// LibMain of the module using the OleClipFormat table.
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//
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//----------------------------------------------------------------
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void
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RegisterOleClipFormats(void)
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{
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for (int i = 0; i<= OCF_LAST; i++)
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OleClipFormat[i] = RegisterClipboardFormat(OleClipNames[i]);
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}
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//+---------------------------------------------------------------
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//
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// Function: IsCompatibleDevice, public
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//
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// Synopsis: Compares two DEVICETARGET structures and returns
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// TRUE if they are compatible.
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//
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// Arguments: [ptdLeft] -- A pointer to a device target
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// [ptdRight] -- Another pointer to a device target
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//
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// Notes: The target devices are compatible if they are both
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// NULL or if they are identical. Otherwise they are
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// incompatible.
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//
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//----------------------------------------------------------------
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BOOL
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IsCompatibleDevice(DVTARGETDEVICE FAR* ptdLeft, DVTARGETDEVICE FAR* ptdRight)
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{
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// same address of td; must be same (handles NULL case)
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if (ptdLeft == ptdRight)
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return TRUE;
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#if 1
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//fix for NTbug 20692 - reason: see bad assumption below
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if ((ptdRight == DVTARGETIGNORE) || (ptdLeft == DVTARGETIGNORE))
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return TRUE;
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#endif
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// The following is a wrong assumption for device independant formats
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// like CF_DIB and CF_METAFILE
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// if ones NULL, and the others not then they are incompatible
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if ((ptdRight == NULL) || (ptdLeft == NULL))
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return FALSE;
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// different sizes, not equal
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if (ptdLeft->tdSize != ptdRight->tdSize)
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return FALSE;
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return _fmemcmp(ptdLeft, ptdRight, (size_t)ptdLeft->tdSize) == 0;
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}
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//+---------------------------------------------------------------
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//
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// Function: IsCompatibleFormat, public
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//
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// Synopsis: Compares two FORMATETC structures and returns
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// TRUE if they are compatible.
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//
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// Arguments: [f1] -- A FORMATETC structure
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// [f2] -- Another FORMATETC structure
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//
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// Notes: This function ignores the lindex member of the
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// FORMATETCs.
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//
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//----------------------------------------------------------------
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BOOL
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IsCompatibleFormat(FORMATETC& f1, FORMATETC& f2)
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{
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return f1.cfFormat == f2.cfFormat
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&& IsCompatibleDevice(f1.ptd, f2.ptd)
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&& (f1.dwAspect & f2.dwAspect) != 0L
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&& (f1.tymed & f2.tymed) != 0;
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}
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//+---------------------------------------------------------------
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//
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// Function: FindCompatibleFormat
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//
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// Synopsis: Searches a table of FORMATETC structures and
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// returns the index of the first entry that is
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// compatible with a specified FORMATETC.
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//
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// Arguments: [FmtTable] -- the table of FORMATETCs
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// [iSize] -- the number of entries in the format table
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// [formatetc] -- the FORMATETC we are comparing for compatibility
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//
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// Returns: The index into the table of the compatible format, or
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// -1 if no compatible format was found.
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//
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// Notes: This function is typically used in conjunction with
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// IDataObject methods that need to check if a requested format
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// is available.
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//
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//----------------------------------------------------------------
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int
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FindCompatibleFormat(FORMATETC FmtTable[], int iSize, FORMATETC& formatetc)
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{
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// look through the table for a compatible format
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for (int i = 0; i < iSize; i++)
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{
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if (IsCompatibleFormat(formatetc, FmtTable[i]))
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return i;
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}
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return -1;
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}
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//+---------------------------------------------------------------
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//
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// Function: GetObjectDescriptor
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//
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// Synopsis: Extracts an OBJECTDESCRIPTOR from an IDataObject,
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// if available.
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//
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// Arguments: [pDataObj] -- data object from which to extract an object descriptor
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// [pDescOut] -- object descriptor structure to fill in
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//
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// Returns: Success iff the object descriptor could be extracted.
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// This does not copy out the dwFullUserTypeName or
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// dwSrcOfCopy strings.
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//
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//----------------------------------------------------------------
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HRESULT
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GetObjectDescriptor(LPDATAOBJECT pDataObj, LPOBJECTDESCRIPTOR pDescOut)
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{
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HRESULT r;
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HGLOBAL hglobal = GlobalAlloc(GMEM_SHARE, sizeof(OBJECTDESCRIPTOR)+256);
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LPOBJECTDESCRIPTOR pObjDesc = (LPOBJECTDESCRIPTOR)GlobalLock(hglobal);
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if (pObjDesc == NULL)
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{
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DOUT(TEXT("o2base/dvutils/GetObjectDescriptor failed\r\n"));
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r = E_OUTOFMEMORY;
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}
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else
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{
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FORMATETC formatetc =
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{ (WORD)OleClipFormat[OCF_OBJECTDESCRIPTOR],
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NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM stgmedium;
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stgmedium.tymed = TYMED_HGLOBAL;
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stgmedium.hGlobal = hglobal;
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stgmedium.pUnkForRelease = NULL;
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if (OK(r = pDataObj->GetDataHere(&formatetc, &stgmedium)))
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{
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if (pDescOut != NULL)
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{
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// note: in the future we may wish to copy out the strings
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// into two out parameters. This would be used in
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// implementing the Paste Special dialog box.
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*pDescOut = *pObjDesc;
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pDescOut->dwFullUserTypeName = 0;
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pDescOut->dwSrcOfCopy = 0;
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}
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}
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GlobalUnlock(hglobal);
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GlobalFree(hglobal);
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}
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return r;
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}
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//+---------------------------------------------------------------
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//
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// Function: UpdateObjectDescriptor
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//
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// Synopsis: Updates the pointl and dwDrawAspects of an OBJECTDESCRIPTOR
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// on a data object
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//
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// Arguments: [pDataObj] -- the data object to update
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// [ptl] -- the pointl to update in the object descriptor
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// [dwAspect] -- the draw aspect to update in the object descriptor
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//
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// Returns: Success iff the object descriptor could be updated
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//
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// Notes: This method is for IDataObjects used in drag-drop.
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// The object being dragged supplies the object descriptor but only
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// the container knows where the point that the mouse button went
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// down relative to the corner of the object, and what aspect
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// of the object the container is displaying.
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// The container uses this method to fill in that missing information.
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// This performs a GetDataHere on the object to get a filled-in
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// object descriptor. It then updates the pointl and dwDrawAspect
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// fields and uses SetData to update the object.
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//
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//----------------------------------------------------------------
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HRESULT
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UpdateObjectDescriptor(LPDATAOBJECT pDataObj, POINTL& ptl, DWORD dwAspect)
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{
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HRESULT r;
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HGLOBAL hglobal = GlobalAlloc(GMEM_SHARE, sizeof(OBJECTDESCRIPTOR)+256);
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LPOBJECTDESCRIPTOR pObjDesc = (LPOBJECTDESCRIPTOR)GlobalLock(hglobal);
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if (pObjDesc == NULL)
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{
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DOUT(TEXT("o2base/dvutils/UpdateObjectDescriptor failed\r\n"));
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r = E_OUTOFMEMORY;
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}
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else
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{
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FORMATETC formatetc =
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{ (WORD)OleClipFormat[OCF_OBJECTDESCRIPTOR],
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NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
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STGMEDIUM stgmedium;
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stgmedium.tymed = TYMED_HGLOBAL;
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stgmedium.hGlobal = hglobal;
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stgmedium.pUnkForRelease = NULL;
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if (OK(r = pDataObj->GetDataHere(&formatetc, &stgmedium)))
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{
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pObjDesc->pointl = ptl;
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pObjDesc->dwDrawAspect = dwAspect;
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r = pDataObj->SetData(&formatetc, &stgmedium, FALSE);
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}
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GlobalUnlock(hglobal);
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GlobalFree(hglobal);
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}
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return r;
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}
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//+---------------------------------------------------------------
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//
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// Function: DrawMetafile
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//
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// Synopsis: Creates a metafile from an IViewObject using the Draw method
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//
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// Arguments: [pVwObj] -- the view object
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// [rc] -- rectangle on the view object to draw
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// [dwAspect] -- aspect of the view object to draw, typically
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// content or icon
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// [pHMF] -- place where handle to the metafile is drawn
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//
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// Returns: Success iff the metafile was drawn successfully.
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//
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//----------------------------------------------------------------
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HRESULT
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DrawMetafile(LPVIEWOBJECT pVwObj,
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RECT& rc,
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DWORD dwAspect,
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HMETAFILE FAR* pHMF)
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{
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HRESULT hr;
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HMETAFILE hmf = NULL;
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HDC hdc;
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if ((hdc = CreateMetaFile(NULL)) == NULL)
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{
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DOUT(TEXT("o2base/dvutils/DrawMetafile failed to create metafile\r\n"));
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hr = E_OUTOFMEMORY;
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}
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else
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{
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SetMapMode(hdc, MM_ANISOTROPIC);
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SetWindowOrgEx(hdc, 0, 0, NULL);
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SetWindowExtEx(hdc, rc.right, rc.bottom, NULL);
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hr = OleDraw(pVwObj, dwAspect, hdc, &rc);
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hmf = CloseMetaFile(hdc);
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if (!OK(hr))
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{
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DeleteMetaFile(hmf);
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hmf = NULL;
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}
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if (hmf == NULL)
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{
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DOUT(TEXT("o2base/dvutils/DrawMetafile failed\r\n"));
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hr = E_OUTOFMEMORY;
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}
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}
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*pHMF = hmf;
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return hr;
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}
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