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cef/tests/cefclient/browser/osr_dragdrop_win.cc

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// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#include "tests/cefclient/browser/osr_dragdrop_win.h"
#if defined(CEF_USE_ATL)
#include <shellapi.h>
#include <shlobj.h>
#include <windowsx.h>
#include <algorithm>
#include <string>
#include "include/wrapper/cef_helpers.h"
#include "tests/cefclient/browser/bytes_write_handler.h"
#include "tests/cefclient/browser/resource.h"
#include "tests/shared/browser/util_win.h"
namespace client {
namespace {
DWORD DragOperationToDropEffect(CefRenderHandler::DragOperation allowed_ops) {
DWORD effect = DROPEFFECT_NONE;
if (allowed_ops & DRAG_OPERATION_COPY)
effect |= DROPEFFECT_COPY;
if (allowed_ops & DRAG_OPERATION_LINK)
effect |= DROPEFFECT_LINK;
if (allowed_ops & DRAG_OPERATION_MOVE)
effect |= DROPEFFECT_MOVE;
return effect;
}
CefRenderHandler::DragOperationsMask DropEffectToDragOperation(DWORD effect) {
DWORD operation = DRAG_OPERATION_NONE;
if (effect & DROPEFFECT_COPY)
operation |= DRAG_OPERATION_COPY;
if (effect & DROPEFFECT_LINK)
operation |= DRAG_OPERATION_LINK;
if (effect & DROPEFFECT_MOVE)
operation |= DRAG_OPERATION_MOVE;
return static_cast<CefRenderHandler::DragOperationsMask>(operation);
}
CefMouseEvent ToMouseEvent(POINTL p, DWORD key_state, HWND hWnd) {
CefMouseEvent ev;
POINT screen_point = {p.x, p.y};
ScreenToClient(hWnd, &screen_point);
ev.x = screen_point.x;
ev.y = screen_point.y;
ev.modifiers = GetCefMouseModifiers(key_state);
return ev;
}
void GetStorageForBytes(STGMEDIUM* storage, const void* data, size_t bytes) {
HANDLE handle = GlobalAlloc(GPTR, static_cast<int>(bytes));
if (handle) {
memcpy(handle, data, bytes);
}
storage->hGlobal = handle;
storage->tymed = TYMED_HGLOBAL;
storage->pUnkForRelease = nullptr;
}
template <typename T>
void GetStorageForString(STGMEDIUM* stgmed, const std::basic_string<T>& data) {
GetStorageForBytes(
stgmed, data.c_str(),
(data.size() + 1) * sizeof(typename std::basic_string<T>::value_type));
}
void GetStorageForFileDescriptor(STGMEDIUM* storage,
const std::wstring& file_name) {
DCHECK(!file_name.empty());
HANDLE hdata = GlobalAlloc(GPTR, sizeof(FILEGROUPDESCRIPTOR));
FILEGROUPDESCRIPTOR* descriptor =
reinterpret_cast<FILEGROUPDESCRIPTOR*>(hdata);
descriptor->cItems = 1;
descriptor->fgd[0].dwFlags = FD_LINKUI;
wcsncpy_s(descriptor->fgd[0].cFileName, MAX_PATH, file_name.c_str(),
std::min(file_name.size(), static_cast<size_t>(MAX_PATH - 1u)));
storage->tymed = TYMED_HGLOBAL;
storage->hGlobal = hdata;
storage->pUnkForRelease = nullptr;
}
// Helper method for converting from text/html to MS CF_HTML.
// Documentation for the CF_HTML format is available at
// http://msdn.microsoft.com/en-us/library/aa767917(VS.85).aspx
std::string HtmlToCFHtml(const std::string& html, const std::string& base_url) {
if (html.empty())
return std::string();
#define MAX_DIGITS 10
#define MAKE_NUMBER_FORMAT_1(digits) MAKE_NUMBER_FORMAT_2(digits)
#define MAKE_NUMBER_FORMAT_2(digits) "%0" #digits "u"
#define NUMBER_FORMAT MAKE_NUMBER_FORMAT_1(MAX_DIGITS)
static const char* header =
"Version:0.9\r\n"
"StartHTML:" NUMBER_FORMAT
"\r\n"
"EndHTML:" NUMBER_FORMAT
"\r\n"
"StartFragment:" NUMBER_FORMAT
"\r\n"
"EndFragment:" NUMBER_FORMAT "\r\n";
static const char* source_url_prefix = "SourceURL:";
static const char* start_markup = "<html>\r\n<body>\r\n<!--StartFragment-->";
static const char* end_markup = "<!--EndFragment-->\r\n</body>\r\n</html>";
// Calculate offsets
size_t start_html_offset =
strlen(header) - strlen(NUMBER_FORMAT) * 4 + MAX_DIGITS * 4;
if (!base_url.empty()) {
start_html_offset +=
strlen(source_url_prefix) + base_url.length() + 2; // Add 2 for \r\n.
}
size_t start_fragment_offset = start_html_offset + strlen(start_markup);
size_t end_fragment_offset = start_fragment_offset + html.length();
size_t end_html_offset = end_fragment_offset + strlen(end_markup);
char raw_result[1024];
_snprintf(raw_result, sizeof(1024), header, start_html_offset,
end_html_offset, start_fragment_offset, end_fragment_offset);
std::string result = raw_result;
if (!base_url.empty()) {
result.append(source_url_prefix);
result.append(base_url);
result.append("\r\n");
}
result.append(start_markup);
result.append(html);
result.append(end_markup);
#undef MAX_DIGITS
#undef MAKE_NUMBER_FORMAT_1
#undef MAKE_NUMBER_FORMAT_2
#undef NUMBER_FORMAT
return result;
}
void CFHtmlExtractMetadata(const std::string& cf_html,
std::string* base_url,
size_t* html_start,
size_t* fragment_start,
size_t* fragment_end) {
// Obtain base_url if present.
if (base_url) {
static std::string src_url_str("SourceURL:");
size_t line_start = cf_html.find(src_url_str);
if (line_start != std::string::npos) {
size_t src_end = cf_html.find("\n", line_start);
size_t src_start = line_start + src_url_str.length();
if (src_end != std::string::npos && src_start != std::string::npos) {
*base_url = cf_html.substr(src_start, src_end - src_start);
}
}
}
// Find the markup between "<!--StartFragment-->" and "<!--EndFragment-->".
// If the comments cannot be found, like copying from OpenOffice Writer,
// we simply fall back to using StartFragment/EndFragment bytecount values
// to determine the fragment indexes.
std::string cf_html_lower = cf_html;
size_t markup_start = cf_html_lower.find("<html", 0);
if (html_start) {
*html_start = markup_start;
}
size_t tag_start = cf_html.find("<!--StartFragment", markup_start);
if (tag_start == std::string::npos) {
static std::string start_fragment_str("StartFragment:");
size_t start_fragment_start = cf_html.find(start_fragment_str);
if (start_fragment_start != std::string::npos) {
*fragment_start =
static_cast<size_t>(atoi(cf_html.c_str() + start_fragment_start +
start_fragment_str.length()));
}
static std::string end_fragment_str("EndFragment:");
size_t end_fragment_start = cf_html.find(end_fragment_str);
if (end_fragment_start != std::string::npos) {
*fragment_end = static_cast<size_t>(atoi(
cf_html.c_str() + end_fragment_start + end_fragment_str.length()));
}
} else {
*fragment_start = cf_html.find('>', tag_start) + 1;
size_t tag_end = cf_html.rfind("<!--EndFragment", std::string::npos);
*fragment_end = cf_html.rfind('<', tag_end);
}
}
void CFHtmlToHtml(const std::string& cf_html,
std::string* html,
std::string* base_url) {
size_t frag_start = std::string::npos;
size_t frag_end = std::string::npos;
CFHtmlExtractMetadata(cf_html, base_url, nullptr, &frag_start, &frag_end);
if (html && frag_start != std::string::npos &&
frag_end != std::string::npos) {
*html = cf_html.substr(frag_start, frag_end - frag_start);
}
}
const DWORD moz_url_format = ::RegisterClipboardFormat(L"text/x-moz-url");
const DWORD html_format = ::RegisterClipboardFormat(L"HTML Format");
const DWORD file_desc_format = ::RegisterClipboardFormat(CFSTR_FILEDESCRIPTOR);
const DWORD file_contents_format =
::RegisterClipboardFormat(CFSTR_FILECONTENTS);
bool DragDataToDataObject(CefRefPtr<CefDragData> drag_data,
IDataObject** data_object) {
const int kMaxDataObjects = 10;
FORMATETC fmtetcs[kMaxDataObjects];
STGMEDIUM stgmeds[kMaxDataObjects];
FORMATETC fmtetc = {0, nullptr, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
int curr_index = 0;
CefString text = drag_data->GetFragmentText();
if (!text.empty()) {
fmtetc.cfFormat = CF_UNICODETEXT;
fmtetcs[curr_index] = fmtetc;
GetStorageForString(&stgmeds[curr_index], text.ToWString());
curr_index++;
}
if (drag_data->IsLink() && !drag_data->GetLinkURL().empty()) {
std::wstring x_moz_url_str = drag_data->GetLinkURL().ToWString();
x_moz_url_str += '\n';
x_moz_url_str += drag_data->GetLinkTitle().ToWString();
fmtetc.cfFormat = moz_url_format;
fmtetcs[curr_index] = fmtetc;
GetStorageForString(&stgmeds[curr_index], x_moz_url_str);
curr_index++;
}
CefString html = drag_data->GetFragmentHtml();
if (!html.empty()) {
CefString base_url = drag_data->GetFragmentBaseURL();
std::string cfhtml = HtmlToCFHtml(html.ToString(), base_url.ToString());
fmtetc.cfFormat = html_format;
fmtetcs[curr_index] = fmtetc;
GetStorageForString(&stgmeds[curr_index], cfhtml);
curr_index++;
}
size_t bufferSize = drag_data->GetFileContents(nullptr);
if (bufferSize) {
CefRefPtr<BytesWriteHandler> handler = new BytesWriteHandler(bufferSize);
CefRefPtr<CefStreamWriter> writer =
CefStreamWriter::CreateForHandler(handler.get());
drag_data->GetFileContents(writer);
DCHECK_EQ(handler->GetDataSize(), static_cast<int64>(bufferSize));
CefString fileName = drag_data->GetFileName();
GetStorageForFileDescriptor(&stgmeds[curr_index], fileName.ToWString());
fmtetc.cfFormat = file_desc_format;
fmtetcs[curr_index] = fmtetc;
curr_index++;
GetStorageForBytes(&stgmeds[curr_index], handler->GetData(),
handler->GetDataSize());
fmtetc.cfFormat = file_contents_format;
fmtetcs[curr_index] = fmtetc;
curr_index++;
}
DCHECK_LT(curr_index, kMaxDataObjects);
CComPtr<DataObjectWin> obj =
DataObjectWin::Create(fmtetcs, stgmeds, curr_index);
(*data_object) = obj.Detach();
return true;
}
CefRefPtr<CefDragData> DataObjectToDragData(IDataObject* data_object) {
CefRefPtr<CefDragData> drag_data = CefDragData::Create();
IEnumFORMATETC* enumFormats = nullptr;
HRESULT res = data_object->EnumFormatEtc(DATADIR_GET, &enumFormats);
if (res != S_OK)
return drag_data;
enumFormats->Reset();
const int kCelt = 10;
ULONG celtFetched;
do {
celtFetched = kCelt;
FORMATETC rgelt[kCelt];
res = enumFormats->Next(kCelt, rgelt, &celtFetched);
for (unsigned i = 0; i < celtFetched; i++) {
CLIPFORMAT format = rgelt[i].cfFormat;
if (!(format == CF_UNICODETEXT || format == CF_TEXT ||
format == moz_url_format || format == html_format ||
format == CF_HDROP) ||
rgelt[i].tymed != TYMED_HGLOBAL)
continue;
STGMEDIUM medium;
if (data_object->GetData(&rgelt[i], &medium) == S_OK) {
if (!medium.hGlobal) {
ReleaseStgMedium(&medium);
continue;
}
void* hGlobal = GlobalLock(medium.hGlobal);
if (!hGlobal) {
ReleaseStgMedium(&medium);
continue;
}
if (format == CF_UNICODETEXT) {
CefString text;
text.FromWString((std::wstring::value_type*)hGlobal);
drag_data->SetFragmentText(text);
} else if (format == CF_TEXT) {
CefString text;
text.FromString((std::string::value_type*)hGlobal);
drag_data->SetFragmentText(text);
} else if (format == moz_url_format) {
std::wstring html((std::wstring::value_type*)hGlobal);
size_t pos = html.rfind('\n');
CefString url(html.substr(0, pos));
CefString title(html.substr(pos + 1));
drag_data->SetLinkURL(url);
drag_data->SetLinkTitle(title);
} else if (format == html_format) {
std::string cf_html((std::string::value_type*)hGlobal);
std::string base_url;
std::string html;
CFHtmlToHtml(cf_html, &html, &base_url);
drag_data->SetFragmentHtml(html);
drag_data->SetFragmentBaseURL(base_url);
}
if (format == CF_HDROP) {
HDROP hdrop = (HDROP)hGlobal;
const int kMaxFilenameLen = 4096;
const unsigned num_files = DragQueryFileW(hdrop, 0xffffffff, 0, 0);
for (unsigned int x = 0; x < num_files; ++x) {
wchar_t filename[kMaxFilenameLen];
if (!DragQueryFileW(hdrop, x, filename, kMaxFilenameLen))
continue;
WCHAR* name = wcsrchr(filename, '\\');
drag_data->AddFile(filename, (name ? name + 1 : filename));
}
}
if (medium.hGlobal)
GlobalUnlock(medium.hGlobal);
if (format == CF_HDROP)
DragFinish((HDROP)hGlobal);
else
ReleaseStgMedium(&medium);
}
}
} while (res == S_OK);
enumFormats->Release();
return drag_data;
}
} // namespace
CComPtr<DropTargetWin> DropTargetWin::Create(OsrDragEvents* callback,
HWND hWnd) {
return CComPtr<DropTargetWin>(new DropTargetWin(callback, hWnd));
}
HRESULT DropTargetWin::DragEnter(IDataObject* data_object,
DWORD key_state,
POINTL cursor_position,
DWORD* effect) {
if (!callback_)
return E_UNEXPECTED;
CefRefPtr<CefDragData> drag_data = current_drag_data_;
if (!drag_data) {
drag_data = DataObjectToDragData(data_object);
}
CefMouseEvent ev = ToMouseEvent(cursor_position, key_state, hWnd_);
CefBrowserHost::DragOperationsMask mask = DropEffectToDragOperation(*effect);
mask = callback_->OnDragEnter(drag_data, ev, mask);
*effect = DragOperationToDropEffect(mask);
return S_OK;
}
CefBrowserHost::DragOperationsMask DropTargetWin::StartDragging(
CefRefPtr<CefBrowser> browser,
CefRefPtr<CefDragData> drag_data,
CefRenderHandler::DragOperationsMask allowed_ops,
int x,
int y) {
CComPtr<IDataObject> dataObject;
DWORD resEffect = DROPEFFECT_NONE;
if (DragDataToDataObject(drag_data, &dataObject)) {
CComPtr<DropSourceWin> dropSource = DropSourceWin::Create();
DWORD effect = DragOperationToDropEffect(allowed_ops);
current_drag_data_ = drag_data->Clone();
current_drag_data_->ResetFileContents();
HRESULT res = DoDragDrop(dataObject, dropSource, effect, &resEffect);
if (res != DRAGDROP_S_DROP)
resEffect = DROPEFFECT_NONE;
current_drag_data_ = nullptr;
}
return DropEffectToDragOperation(resEffect);
}
HRESULT DropTargetWin::DragOver(DWORD key_state,
POINTL cursor_position,
DWORD* effect) {
if (!callback_)
return E_UNEXPECTED;
CefMouseEvent ev = ToMouseEvent(cursor_position, key_state, hWnd_);
CefBrowserHost::DragOperationsMask mask = DropEffectToDragOperation(*effect);
mask = callback_->OnDragOver(ev, mask);
*effect = DragOperationToDropEffect(mask);
return S_OK;
}
HRESULT DropTargetWin::DragLeave() {
if (!callback_)
return E_UNEXPECTED;
callback_->OnDragLeave();
return S_OK;
}
HRESULT DropTargetWin::Drop(IDataObject* data_object,
DWORD key_state,
POINTL cursor_position,
DWORD* effect) {
if (!callback_)
return E_UNEXPECTED;
CefMouseEvent ev = ToMouseEvent(cursor_position, key_state, hWnd_);
CefBrowserHost::DragOperationsMask mask = DropEffectToDragOperation(*effect);
mask = callback_->OnDrop(ev, mask);
*effect = DragOperationToDropEffect(mask);
return S_OK;
}
CComPtr<DropSourceWin> DropSourceWin::Create() {
return CComPtr<DropSourceWin>(new DropSourceWin());
}
HRESULT DropSourceWin::GiveFeedback(DWORD dwEffect) {
return DRAGDROP_S_USEDEFAULTCURSORS;
}
HRESULT DropSourceWin::QueryContinueDrag(BOOL fEscapePressed,
DWORD grfKeyState) {
if (fEscapePressed) {
return DRAGDROP_S_CANCEL;
}
if (!(grfKeyState & MK_LBUTTON)) {
return DRAGDROP_S_DROP;
}
return S_OK;
}
HRESULT DragEnumFormatEtc::CreateEnumFormatEtc(
UINT cfmt,
FORMATETC* afmt,
IEnumFORMATETC** ppEnumFormatEtc) {
if (cfmt == 0 || afmt == 0 || ppEnumFormatEtc == 0)
return E_INVALIDARG;
*ppEnumFormatEtc = new DragEnumFormatEtc(afmt, cfmt);
return (*ppEnumFormatEtc) ? S_OK : E_OUTOFMEMORY;
}
HRESULT DragEnumFormatEtc::Next(ULONG celt,
FORMATETC* pFormatEtc,
ULONG* pceltFetched) {
ULONG copied = 0;
// copy the FORMATETC structures into the caller's buffer
while (m_nIndex < m_nNumFormats && copied < celt) {
DeepCopyFormatEtc(&pFormatEtc[copied], &m_pFormatEtc[m_nIndex]);
copied++;
m_nIndex++;
}
// store result
if (pceltFetched != 0)
*pceltFetched = copied;
// did we copy all that was requested?
return (copied == celt) ? S_OK : S_FALSE;
}
HRESULT DragEnumFormatEtc::Skip(ULONG celt) {
m_nIndex += celt;
return (m_nIndex <= m_nNumFormats) ? S_OK : S_FALSE;
}
HRESULT DragEnumFormatEtc::Reset(void) {
m_nIndex = 0;
return S_OK;
}
HRESULT DragEnumFormatEtc::Clone(IEnumFORMATETC** ppEnumFormatEtc) {
HRESULT hResult;
// make a duplicate enumerator
hResult = CreateEnumFormatEtc(m_nNumFormats, m_pFormatEtc, ppEnumFormatEtc);
if (hResult == S_OK) {
// manually set the index state
reinterpret_cast<DragEnumFormatEtc*>(*ppEnumFormatEtc)->m_nIndex = m_nIndex;
}
return hResult;
}
DragEnumFormatEtc::DragEnumFormatEtc(FORMATETC* pFormatEtc, int nNumFormats) {
AddRef();
m_nIndex = 0;
m_nNumFormats = nNumFormats;
m_pFormatEtc = new FORMATETC[nNumFormats];
// make a new copy of each FORMATETC structure
for (int i = 0; i < nNumFormats; i++) {
DeepCopyFormatEtc(&m_pFormatEtc[i], &pFormatEtc[i]);
}
}
DragEnumFormatEtc::~DragEnumFormatEtc() {
// first free any DVTARGETDEVICE structures
for (ULONG i = 0; i < m_nNumFormats; i++) {
if (m_pFormatEtc[i].ptd)
CoTaskMemFree(m_pFormatEtc[i].ptd);
}
// now free the main array
delete[] m_pFormatEtc;
}
void DragEnumFormatEtc::DeepCopyFormatEtc(FORMATETC* dest, FORMATETC* source) {
// copy the source FORMATETC into dest
*dest = *source;
if (source->ptd) {
// allocate memory for the DVTARGETDEVICE if necessary
dest->ptd = reinterpret_cast<DVTARGETDEVICE*>(
CoTaskMemAlloc(sizeof(DVTARGETDEVICE)));
// copy the contents of the source DVTARGETDEVICE into dest->ptd
*(dest->ptd) = *(source->ptd);
}
}
CComPtr<DataObjectWin> DataObjectWin::Create(FORMATETC* fmtetc,
STGMEDIUM* stgmed,
int count) {
return CComPtr<DataObjectWin>(new DataObjectWin(fmtetc, stgmed, count));
}
HRESULT DataObjectWin::GetDataHere(FORMATETC* pFormatEtc, STGMEDIUM* pmedium) {
return E_NOTIMPL;
}
HRESULT DataObjectWin::QueryGetData(FORMATETC* pFormatEtc) {
return (LookupFormatEtc(pFormatEtc) == -1) ? DV_E_FORMATETC : S_OK;
}
HRESULT DataObjectWin::GetCanonicalFormatEtc(FORMATETC* pFormatEct,
FORMATETC* pFormatEtcOut) {
pFormatEtcOut->ptd = nullptr;
return E_NOTIMPL;
}
HRESULT DataObjectWin::SetData(FORMATETC* pFormatEtc,
STGMEDIUM* pMedium,
BOOL fRelease) {
return E_NOTIMPL;
}
HRESULT DataObjectWin::DAdvise(FORMATETC* pFormatEtc,
DWORD advf,
IAdviseSink*,
DWORD*) {
return E_NOTIMPL;
}
HRESULT DataObjectWin::DUnadvise(DWORD dwConnection) {
return E_NOTIMPL;
}
HRESULT DataObjectWin::EnumDAdvise(IEnumSTATDATA** ppEnumAdvise) {
return E_NOTIMPL;
}
HRESULT DataObjectWin::EnumFormatEtc(DWORD dwDirection,
IEnumFORMATETC** ppEnumFormatEtc) {
return DragEnumFormatEtc::CreateEnumFormatEtc(m_nNumFormats, m_pFormatEtc,
ppEnumFormatEtc);
}
HRESULT DataObjectWin::GetData(FORMATETC* pFormatEtc, STGMEDIUM* pMedium) {
int idx;
// try to match the specified FORMATETC with one of our supported formats
if ((idx = LookupFormatEtc(pFormatEtc)) == -1)
return DV_E_FORMATETC;
// found a match - transfer data into supplied storage medium
pMedium->tymed = m_pFormatEtc[idx].tymed;
pMedium->pUnkForRelease = 0;
// copy the data into the caller's storage medium
switch (m_pFormatEtc[idx].tymed) {
case TYMED_HGLOBAL:
pMedium->hGlobal = DupGlobalMem(m_pStgMedium[idx].hGlobal);
break;
default:
return DV_E_FORMATETC;
}
return S_OK;
}
HGLOBAL DataObjectWin::DupGlobalMem(HGLOBAL hMem) {
DWORD len = GlobalSize(hMem);
PVOID source = GlobalLock(hMem);
PVOID dest = GlobalAlloc(GMEM_FIXED, len);
memcpy(dest, source, len);
GlobalUnlock(hMem);
return dest;
}
int DataObjectWin::LookupFormatEtc(FORMATETC* pFormatEtc) {
// check each of our formats in turn to see if one matches
for (int i = 0; i < m_nNumFormats; i++) {
if ((m_pFormatEtc[i].tymed & pFormatEtc->tymed) &&
m_pFormatEtc[i].cfFormat == pFormatEtc->cfFormat &&
m_pFormatEtc[i].dwAspect == pFormatEtc->dwAspect) {
// return index of stored format
return i;
}
}
// error, format not found
return -1;
}
DataObjectWin::DataObjectWin(FORMATETC* fmtetc, STGMEDIUM* stgmed, int count)
: ref_count_(0) {
m_nNumFormats = count;
m_pFormatEtc = new FORMATETC[count];
m_pStgMedium = new STGMEDIUM[count];
for (int i = 0; i < count; i++) {
m_pFormatEtc[i] = fmtetc[i];
m_pStgMedium[i] = stgmed[i];
}
}
} // namespace client
#endif // defined(CEF_USE_ATL)
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