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nsDataObjCollection.cpp
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nsDataObjCollection.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Kyle Huey <me@kylehuey.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <shlobj.h>
#include "nsDataObjCollection.h"
#include "nsClipboard.h"
#include "IEnumFE.h"
#include <ole2.h>
// {25589C3E-1FAC-47b9-BF43-CAEA89B79533}
const IID IID_IDataObjCollection =
{0x25589c3e, 0x1fac, 0x47b9, {0xbf, 0x43, 0xca, 0xea, 0x89, 0xb7, 0x95, 0x33}};
/*
* Class nsDataObjCollection
*/
nsDataObjCollection::nsDataObjCollection()
: m_cRef(0), mIsAsyncMode(FALSE), mIsInOperation(FALSE)
{
m_enumFE = new CEnumFormatEtc();
m_enumFE->AddRef();
}
nsDataObjCollection::~nsDataObjCollection()
{
mDataFlavors.Clear();
mDataObjects.Clear();
m_enumFE->Release();
}
// IUnknown interface methods - see iunknown.h for documentation
STDMETHODIMP nsDataObjCollection::QueryInterface(REFIID riid, void** ppv)
{
*ppv=NULL;
if ( (IID_IUnknown == riid) || (IID_IDataObject == riid) ) {
*ppv = static_cast<IDataObject*>(this);
AddRef();
return NOERROR;
}
if ( IID_IDataObjCollection == riid ) {
*ppv = static_cast<nsIDataObjCollection*>(this);
AddRef();
return NOERROR;
}
return E_NOINTERFACE;
}
STDMETHODIMP_(ULONG) nsDataObjCollection::AddRef()
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) nsDataObjCollection::Release()
{
if (0 != --m_cRef)
return m_cRef;
delete this;
return 0;
}
BOOL nsDataObjCollection::FormatsMatch(const FORMATETC& source,
const FORMATETC& target) const
{
if ((source.cfFormat == target.cfFormat) &&
(source.dwAspect & target.dwAspect) &&
(source.tymed & target.tymed)) {
return TRUE;
} else {
return FALSE;
}
}
// IDataObject methods
STDMETHODIMP nsDataObjCollection::GetData(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
static CLIPFORMAT fileDescriptorFlavorA =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA);
static CLIPFORMAT fileDescriptorFlavorW =
::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
static CLIPFORMAT fileFlavor = ::RegisterClipboardFormat(CFSTR_FILECONTENTS);
switch (pFE->cfFormat) {
case CF_TEXT:
case CF_UNICODETEXT:
return GetText(pFE, pSTM);
case CF_HDROP:
return GetFile(pFE, pSTM);
default:
if (pFE->cfFormat == fileDescriptorFlavorA ||
pFE->cfFormat == fileDescriptorFlavorW) {
return GetFileDescriptors(pFE, pSTM);
}
if (pFE->cfFormat == fileFlavor) {
return GetFileContents(pFE, pSTM);
}
}
return GetFirstSupporting(pFE, pSTM);
}
STDMETHODIMP nsDataObjCollection::GetDataHere(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
return E_FAIL;
}
// Other objects querying to see if we support a particular format
STDMETHODIMP nsDataObjCollection::QueryGetData(LPFORMATETC pFE)
{
UINT format = nsClipboard::GetFormat(MULTI_MIME);
if (format == pFE->cfFormat) {
return S_OK;
}
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
IDataObject * dataObj = mDataObjects.ElementAt(i);
if (S_OK == dataObj->QueryGetData(pFE)) {
return S_OK;
}
}
return DV_E_FORMATETC;
}
STDMETHODIMP nsDataObjCollection::GetCanonicalFormatEtc(LPFORMATETC pFEIn,
LPFORMATETC pFEOut)
{
return E_NOTIMPL;
}
STDMETHODIMP nsDataObjCollection::SetData(LPFORMATETC pFE,
LPSTGMEDIUM pSTM,
BOOL fRelease)
{
// Set arbitrary data formats on the first object in the collection and let
// it handle the heavy lifting
if (mDataObjects.Length() == 0)
return E_FAIL;
return mDataObjects.ElementAt(0)->SetData(pFE, pSTM, fRelease);
}
STDMETHODIMP nsDataObjCollection::EnumFormatEtc(DWORD dwDir,
LPENUMFORMATETC *ppEnum)
{
if (dwDir == DATADIR_GET) {
// Clone addref's the new enumerator.
m_enumFE->Clone(ppEnum);
if (!(*ppEnum))
return E_FAIL;
(*ppEnum)->Reset();
return S_OK;
}
return E_NOTIMPL;
}
STDMETHODIMP nsDataObjCollection::DAdvise(LPFORMATETC pFE,
DWORD dwFlags,
LPADVISESINK pIAdviseSink,
DWORD* pdwConn)
{
return OLE_E_ADVISENOTSUPPORTED;
}
STDMETHODIMP nsDataObjCollection::DUnadvise(DWORD dwConn)
{
return OLE_E_ADVISENOTSUPPORTED;
}
STDMETHODIMP nsDataObjCollection::EnumDAdvise(LPENUMSTATDATA *ppEnum)
{
return OLE_E_ADVISENOTSUPPORTED;
}
// GetData and SetData helper functions
HRESULT nsDataObjCollection::AddSetFormat(FORMATETC& aFE)
{
return S_OK;
}
HRESULT nsDataObjCollection::AddGetFormat(FORMATETC& aFE)
{
return S_OK;
}
// Registers a DataFlavor/FE pair
void nsDataObjCollection::AddDataFlavor(const char * aDataFlavor,
LPFORMATETC aFE)
{
// Add the FormatEtc to our list if it's not already there. We don't care
// about the internal aDataFlavor because nsDataObj handles that.
IEnumFORMATETC * ifEtc;
FORMATETC fEtc;
ULONG num;
if (S_OK != this->EnumFormatEtc(DATADIR_GET, &ifEtc))
return;
while (S_OK == ifEtc->Next(1, &fEtc, &num)) {
NS_ASSERTION(1 == num,
"Bit off more than we can chew in nsDataObjCollection::AddDataFlavor");
if (FormatsMatch(fEtc, *aFE)) {
ifEtc->Release();
return;
}
} // If we didn't find a matching format, add this one
ifEtc->Release();
m_enumFE->AddFormatEtc(aFE);
}
// We accept ownership of the nsDataObj which we free on destruction
void nsDataObjCollection::AddDataObject(IDataObject * aDataObj)
{
nsDataObj* dataObj = reinterpret_cast<nsDataObj*>(aDataObj);
mDataObjects.AppendElement(dataObj);
}
// Methods for getting data
HRESULT nsDataObjCollection::GetFile(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
STGMEDIUM workingmedium;
FORMATETC fe = *pFE;
HGLOBAL hGlobalMemory;
HRESULT hr;
// Make enough space for the header and the trailing null
PRUint32 buffersize = sizeof(DROPFILES) + sizeof(PRUnichar);
PRUint32 alloclen = 0;
PRUnichar* realbuffer;
nsAutoString filename;
hGlobalMemory = GlobalAlloc(GHND, buffersize);
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
nsDataObj* dataObj = mDataObjects.ElementAt(i);
hr = dataObj->GetData(&fe, &workingmedium);
if (hr != S_OK) {
switch (hr) {
case DV_E_FORMATETC:
continue;
default:
return hr;
}
}
// Now we need to pull out the filename
PRUnichar* buffer = (PRUnichar*)GlobalLock(workingmedium.hGlobal);
if (buffer == NULL)
return E_FAIL;
buffer += sizeof(DROPFILES)/sizeof(PRUnichar);
filename = buffer;
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
// Now put the filename into our buffer
alloclen = (filename.Length() + 1) * sizeof(PRUnichar);
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
if (hGlobalMemory == NULL)
return E_FAIL;
realbuffer = (PRUnichar*)((char*)GlobalLock(hGlobalMemory) + buffersize);
if (!realbuffer)
return E_FAIL;
realbuffer--; // Overwrite the preceding null
memcpy(realbuffer, filename.get(), alloclen);
GlobalUnlock(hGlobalMemory);
buffersize += alloclen;
}
// We get the last null (on the double null terminator) for free since we used
// the zero memory flag when we allocated. All we need to do is fill the
// DROPFILES structure
DROPFILES* df = (DROPFILES*)GlobalLock(hGlobalMemory);
if (!df)
return E_FAIL;
df->pFiles = sizeof(DROPFILES); //Offset to start of file name string
df->fNC = 0;
df->pt.x = 0;
df->pt.y = 0;
df->fWide = TRUE; // utf-16 chars
GlobalUnlock(hGlobalMemory);
// Finally fill out the STGMEDIUM struct
pSTM->tymed = TYMED_HGLOBAL;
pSTM->pUnkForRelease = NULL; // Caller gets to free the data
pSTM->hGlobal = hGlobalMemory;
return S_OK;
}
HRESULT nsDataObjCollection::GetText(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
STGMEDIUM workingmedium;
FORMATETC fe = *pFE;
HGLOBAL hGlobalMemory;
HRESULT hr;
PRUint32 buffersize = 1;
PRUint32 alloclen = 0;
hGlobalMemory = GlobalAlloc(GHND, buffersize);
if (pFE->cfFormat == CF_TEXT) {
nsCAutoString text;
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
nsDataObj* dataObj = mDataObjects.ElementAt(i);
hr = dataObj->GetData(&fe, &workingmedium);
if (hr != S_OK) {
switch (hr) {
case DV_E_FORMATETC:
continue;
default:
return hr;
}
}
// Now we need to pull out the text
char* buffer = (char*)GlobalLock(workingmedium.hGlobal);
if (buffer == NULL)
return E_FAIL;
text = buffer;
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
// Now put the text into our buffer
alloclen = text.Length();
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen,
GHND);
if (hGlobalMemory == NULL)
return E_FAIL;
buffer = ((char*)GlobalLock(hGlobalMemory) + buffersize);
if (!buffer)
return E_FAIL;
buffer--; // Overwrite the preceding null
memcpy(buffer, text.get(), alloclen);
GlobalUnlock(hGlobalMemory);
buffersize += alloclen;
}
pSTM->tymed = TYMED_HGLOBAL;
pSTM->pUnkForRelease = NULL; // Caller gets to free the data
pSTM->hGlobal = hGlobalMemory;
return S_OK;
}
if (pFE->cfFormat == CF_UNICODETEXT) {
buffersize = sizeof(PRUnichar);
nsAutoString text;
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
nsDataObj* dataObj = mDataObjects.ElementAt(i);
hr = dataObj->GetData(&fe, &workingmedium);
if (hr != S_OK) {
switch (hr) {
case DV_E_FORMATETC:
continue;
default:
return hr;
}
}
// Now we need to pull out the text
PRUnichar* buffer = (PRUnichar*)GlobalLock(workingmedium.hGlobal);
if (buffer == NULL)
return E_FAIL;
text = buffer;
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
// Now put the text into our buffer
alloclen = text.Length() * sizeof(PRUnichar);
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen,
GHND);
if (hGlobalMemory == NULL)
return E_FAIL;
buffer = (PRUnichar*)((char*)GlobalLock(hGlobalMemory) + buffersize);
if (!buffer)
return E_FAIL;
buffer--; // Overwrite the preceding null
memcpy(buffer, text.get(), alloclen);
GlobalUnlock(hGlobalMemory);
buffersize += alloclen;
}
pSTM->tymed = TYMED_HGLOBAL;
pSTM->pUnkForRelease = NULL; // Caller gets to free the data
pSTM->hGlobal = hGlobalMemory;
return S_OK;
}
return E_FAIL;
}
HRESULT nsDataObjCollection::GetFileDescriptors(LPFORMATETC pFE,
LPSTGMEDIUM pSTM)
{
STGMEDIUM workingmedium;
FORMATETC fe = *pFE;
HGLOBAL hGlobalMemory;
HRESULT hr;
PRUint32 buffersize = sizeof(FILEGROUPDESCRIPTOR);
PRUint32 alloclen = sizeof(FILEDESCRIPTOR);
hGlobalMemory = GlobalAlloc(GHND, buffersize);
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
nsDataObj* dataObj = mDataObjects.ElementAt(i);
hr = dataObj->GetData(&fe, &workingmedium);
if (hr != S_OK) {
switch (hr) {
case DV_E_FORMATETC:
continue;
default:
return hr;
}
}
// Now we need to pull out the filedescriptor
FILEDESCRIPTOR* buffer =
(FILEDESCRIPTOR*)((char*)GlobalLock(workingmedium.hGlobal) + sizeof(UINT));
if (buffer == NULL)
return E_FAIL;
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
if (hGlobalMemory == NULL)
return E_FAIL;
FILEGROUPDESCRIPTOR* realbuffer =
(FILEGROUPDESCRIPTOR*)GlobalLock(hGlobalMemory);
if (!realbuffer)
return E_FAIL;
FILEDESCRIPTOR* copyloc = (FILEDESCRIPTOR*)((char*)realbuffer + buffersize);
memcpy(copyloc, buffer, sizeof(FILEDESCRIPTOR));
realbuffer->cItems++;
GlobalUnlock(hGlobalMemory);
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
buffersize += alloclen;
}
pSTM->tymed = TYMED_HGLOBAL;
pSTM->pUnkForRelease = NULL; // Caller gets to free the data
pSTM->hGlobal = hGlobalMemory;
return S_OK;
}
HRESULT nsDataObjCollection::GetFileContents(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
ULONG num = 0;
ULONG numwanted = (pFE->lindex == -1) ? 0 : pFE->lindex;
FORMATETC fEtc = *pFE;
fEtc.lindex = -1; // We're lying to the data object so it thinks it's alone
// The key for this data type is to figure out which data object the index
// corresponds to and then just pass it along
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
nsDataObj* dataObj = mDataObjects.ElementAt(i);
if (dataObj->QueryGetData(&fEtc) != S_OK)
continue;
if (num == numwanted)
return dataObj->GetData(pFE, pSTM);
numwanted++;
}
return DV_E_LINDEX;
}
HRESULT nsDataObjCollection::GetFirstSupporting(LPFORMATETC pFE,
LPSTGMEDIUM pSTM)
{
// There is no way to pass more than one of this, so just find the first data
// object that supports it and pass it along
for (PRUint32 i = 0; i < mDataObjects.Length(); ++i) {
if (mDataObjects.ElementAt(i)->QueryGetData(pFE) == S_OK)
return mDataObjects.ElementAt(i)->GetData(pFE, pSTM);
}
return DV_E_FORMATETC;
}