Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#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() {}
nsDataObjCollection::~nsDataObjCollection() { mDataObjects.Clear(); }
// IUnknown interface methods - see iunknown.h for documentation
STDMETHODIMP nsDataObjCollection::QueryInterface(REFIID riid, void** ppv) {
*ppv = nullptr;
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;
}
// offer to operate asynchronously (required by nsDragService)
if (IID_IDataObjectAsyncCapability == riid) {
*ppv = static_cast<IDataObjectAsyncCapability*>(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;
}
// 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 (uint32_t 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::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);
}
// 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
uint32_t buffersize = sizeof(DROPFILES) + sizeof(char16_t);
uint32_t alloclen = 0;
char16_t* realbuffer;
nsAutoString filename;
hGlobalMemory = GlobalAlloc(GHND, buffersize);
for (uint32_t 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
char16_t* buffer = (char16_t*)GlobalLock(workingmedium.hGlobal);
if (buffer == nullptr) return E_FAIL;
buffer += sizeof(DROPFILES) / sizeof(char16_t);
filename = buffer;
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
// Now put the filename into our buffer
alloclen = (filename.Length() + 1) * sizeof(char16_t);
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
if (hGlobalMemory == nullptr) return E_FAIL;
realbuffer = (char16_t*)((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 = nullptr; // 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;
uint32_t buffersize = 1;
uint32_t alloclen = 0;
hGlobalMemory = GlobalAlloc(GHND, buffersize);
if (pFE->cfFormat == CF_TEXT) {
nsAutoCString text;
for (uint32_t 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 == nullptr) 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 == nullptr) 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 = nullptr; // Caller gets to free the data
pSTM->hGlobal = hGlobalMemory;
return S_OK;
}
if (pFE->cfFormat == CF_UNICODETEXT) {
buffersize = sizeof(char16_t);
nsAutoString text;
for (uint32_t 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
char16_t* buffer = (char16_t*)GlobalLock(workingmedium.hGlobal);
if (buffer == nullptr) return E_FAIL;
text = buffer;
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
// Now put the text into our buffer
alloclen = text.Length() * sizeof(char16_t);
hGlobalMemory =
::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
if (hGlobalMemory == nullptr) return E_FAIL;
buffer = (char16_t*)((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 = nullptr; // 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;
uint32_t buffersize = sizeof(UINT);
uint32_t alloclen = sizeof(FILEDESCRIPTOR);
hGlobalMemory = GlobalAlloc(GHND, buffersize);
for (uint32_t 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 == nullptr) return E_FAIL;
hGlobalMemory = ::GlobalReAlloc(hGlobalMemory, buffersize + alloclen, GHND);
if (hGlobalMemory == nullptr) return E_FAIL;
FILEGROUPDESCRIPTOR* realbuffer =
(FILEGROUPDESCRIPTOR*)GlobalLock(hGlobalMemory);
if (!realbuffer) return E_FAIL;
FILEDESCRIPTOR* copyloc = (FILEDESCRIPTOR*)((char*)realbuffer + buffersize);
memcpy(copyloc, buffer, alloclen);
realbuffer->cItems++;
GlobalUnlock(hGlobalMemory);
GlobalUnlock(workingmedium.hGlobal);
ReleaseStgMedium(&workingmedium);
buffersize += alloclen;
}
pSTM->tymed = TYMED_HGLOBAL;
pSTM->pUnkForRelease = nullptr; // 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 (uint32_t 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);
num++;
}
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 (uint32_t 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;
}