diff options
Diffstat (limited to 'widget/windows/nsDragService.cpp')
| -rw-r--r-- | widget/windows/nsDragService.cpp | 664 |
1 files changed, 664 insertions, 0 deletions
diff --git a/widget/windows/nsDragService.cpp b/widget/windows/nsDragService.cpp new file mode 100644 index 0000000000..80f545d9a7 --- /dev/null +++ b/widget/windows/nsDragService.cpp @@ -0,0 +1,664 @@ +/* -*- 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 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include <ole2.h> +#include <oleidl.h> +#include <shlobj.h> +#include <shlwapi.h> + +// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN +#include <shellapi.h> + +#include "mozilla/RefPtr.h" +#include "nsDragService.h" +#include "nsITransferable.h" +#include "nsDataObj.h" + +#include "nsWidgetsCID.h" +#include "nsNativeDragTarget.h" +#include "nsNativeDragSource.h" +#include "nsClipboard.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/DocumentInlines.h" +#include "nsDataObjCollection.h" + +#include "nsArrayUtils.h" +#include "nsString.h" +#include "nsEscape.h" +#include "nsIScreenManager.h" +#include "nsToolkit.h" +#include "nsCRT.h" +#include "nsDirectoryServiceDefs.h" +#include "nsUnicharUtils.h" +#include "nsRect.h" +#include "nsMathUtils.h" +#include "WinUtils.h" +#include "KeyboardLayout.h" +#include "gfxContext.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/DataSurfaceHelpers.h" +#include "mozilla/gfx/Tools.h" +#include "mozilla/ScopeExit.h" + +using namespace mozilla; +using namespace mozilla::gfx; +using namespace mozilla::widget; + +//------------------------------------------------------------------------- +// +// DragService constructor +// +//------------------------------------------------------------------------- +nsDragService::nsDragService() + : mDataObject(nullptr), mSentLocalDropEvent(false) {} + +//------------------------------------------------------------------------- +// +// DragService destructor +// +//------------------------------------------------------------------------- +nsDragService::~nsDragService() { NS_IF_RELEASE(mDataObject); } + +bool nsDragService::CreateDragImage(nsINode* aDOMNode, + const Maybe<CSSIntRegion>& aRegion, + SHDRAGIMAGE* psdi) { + if (!psdi) return false; + + memset(psdi, 0, sizeof(SHDRAGIMAGE)); + if (!aDOMNode) return false; + + // Prepare the drag image + LayoutDeviceIntRect dragRect; + RefPtr<SourceSurface> surface; + nsPresContext* pc; + DrawDrag(aDOMNode, aRegion, mScreenPosition, &dragRect, &surface, &pc); + if (!surface) return false; + + uint32_t bmWidth = dragRect.Width(), bmHeight = dragRect.Height(); + + if (bmWidth == 0 || bmHeight == 0) return false; + + psdi->crColorKey = CLR_NONE; + + RefPtr<DataSourceSurface> dataSurface = Factory::CreateDataSourceSurface( + IntSize(bmWidth, bmHeight), SurfaceFormat::B8G8R8A8); + NS_ENSURE_TRUE(dataSurface, false); + + DataSourceSurface::MappedSurface map; + if (!dataSurface->Map(DataSourceSurface::MapType::READ_WRITE, &map)) { + return false; + } + + RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData( + BackendType::CAIRO, map.mData, dataSurface->GetSize(), map.mStride, + dataSurface->GetFormat()); + if (!dt) { + dataSurface->Unmap(); + return false; + } + + dt->DrawSurface( + surface, + Rect(0, 0, dataSurface->GetSize().width, dataSurface->GetSize().height), + Rect(0, 0, surface->GetSize().width, surface->GetSize().height), + DrawSurfaceOptions(), DrawOptions(1.0f, CompositionOp::OP_SOURCE)); + dt->Flush(); + + BITMAPV5HEADER bmih; + memset((void*)&bmih, 0, sizeof(BITMAPV5HEADER)); + bmih.bV5Size = sizeof(BITMAPV5HEADER); + bmih.bV5Width = bmWidth; + bmih.bV5Height = -(int32_t)bmHeight; // flip vertical + bmih.bV5Planes = 1; + bmih.bV5BitCount = 32; + bmih.bV5Compression = BI_BITFIELDS; + bmih.bV5RedMask = 0x00FF0000; + bmih.bV5GreenMask = 0x0000FF00; + bmih.bV5BlueMask = 0x000000FF; + bmih.bV5AlphaMask = 0xFF000000; + + HDC hdcSrc = CreateCompatibleDC(nullptr); + void* lpBits = nullptr; + if (hdcSrc) { + psdi->hbmpDragImage = + ::CreateDIBSection(hdcSrc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS, + (void**)&lpBits, nullptr, 0); + if (psdi->hbmpDragImage && lpBits) { + CopySurfaceDataToPackedArray(map.mData, static_cast<uint8_t*>(lpBits), + dataSurface->GetSize(), map.mStride, + BytesPerPixel(dataSurface->GetFormat())); + } + + psdi->sizeDragImage.cx = bmWidth; + psdi->sizeDragImage.cy = bmHeight; + + const auto screenPoint = + LayoutDeviceIntPoint::Round(mScreenPosition * pc->CSSToDevPixelScale()); + psdi->ptOffset.x = screenPoint.x - dragRect.X(); + psdi->ptOffset.y = screenPoint.y - dragRect.Y(); + + DeleteDC(hdcSrc); + } + + dataSurface->Unmap(); + + return psdi->hbmpDragImage != nullptr; +} + +//------------------------------------------------------------------------- +nsresult nsDragService::InvokeDragSessionImpl( + nsIArray* anArrayTransferables, const Maybe<CSSIntRegion>& aRegion, + uint32_t aActionType) { + // Try and get source URI of the items that are being dragged + nsIURI* uri = nullptr; + + RefPtr<dom::Document> doc(mSourceDocument); + if (doc) { + uri = doc->GetDocumentURI(); + } + + uint32_t numItemsToDrag = 0; + nsresult rv = anArrayTransferables->GetLength(&numItemsToDrag); + if (!numItemsToDrag) return NS_ERROR_FAILURE; + + // The clipboard class contains some static utility methods that we + // can use to create an IDataObject from the transferable + + // if we're dragging more than one item, we need to create a + // "collection" object to fake out the OS. This collection contains + // one |IDataObject| for each transferable. If there is just the one + // (most cases), only pass around the native |IDataObject|. + RefPtr<IDataObject> itemToDrag; + if (numItemsToDrag > 1) { + nsDataObjCollection* dataObjCollection = new nsDataObjCollection(); + if (!dataObjCollection) return NS_ERROR_OUT_OF_MEMORY; + itemToDrag = dataObjCollection; + for (uint32_t i = 0; i < numItemsToDrag; ++i) { + nsCOMPtr<nsITransferable> trans = + do_QueryElementAt(anArrayTransferables, i); + if (trans) { + RefPtr<IDataObject> dataObj; + rv = nsClipboard::CreateNativeDataObject(trans, getter_AddRefs(dataObj), + uri); + NS_ENSURE_SUCCESS(rv, rv); + // Add the flavors to the collection object too + rv = nsClipboard::SetupNativeDataObject(trans, dataObjCollection); + NS_ENSURE_SUCCESS(rv, rv); + + dataObjCollection->AddDataObject(dataObj); + } + } + } // if dragging multiple items + else { + nsCOMPtr<nsITransferable> trans = + do_QueryElementAt(anArrayTransferables, 0); + if (trans) { + rv = nsClipboard::CreateNativeDataObject(trans, + getter_AddRefs(itemToDrag), uri); + NS_ENSURE_SUCCESS(rv, rv); + } + } // else dragging a single object + + // Create a drag image if support is available + IDragSourceHelper* pdsh; + if (SUCCEEDED(CoCreateInstance(CLSID_DragDropHelper, nullptr, + CLSCTX_INPROC_SERVER, IID_IDragSourceHelper, + (void**)&pdsh))) { + SHDRAGIMAGE sdi; + if (CreateDragImage(mSourceNode, aRegion, &sdi)) { + if (FAILED(pdsh->InitializeFromBitmap(&sdi, itemToDrag))) + DeleteObject(sdi.hbmpDragImage); + } + pdsh->Release(); + } + + // Kick off the native drag session + return StartInvokingDragSession(itemToDrag, aActionType); +} + +static HWND GetSourceWindow(dom::Document* aSourceDocument) { + if (!aSourceDocument) { + return nullptr; + } + + auto* pc = aSourceDocument->GetPresContext(); + if (!pc) { + return nullptr; + } + + nsCOMPtr<nsIWidget> widget = pc->GetRootWidget(); + if (!widget) { + return nullptr; + } + + return (HWND)widget->GetNativeData(NS_NATIVE_WINDOW); +} + +//------------------------------------------------------------------------- +nsresult nsDragService::StartInvokingDragSession(IDataObject* aDataObj, + uint32_t aActionType) { + // To do the drag we need to create an object that + // implements the IDataObject interface (for OLE) + RefPtr<nsNativeDragSource> nativeDragSrc = + new nsNativeDragSource(mDataTransfer); + + // Now figure out what the native drag effect should be + DWORD winDropRes; + DWORD effects = DROPEFFECT_SCROLL; + if (aActionType & DRAGDROP_ACTION_COPY) { + effects |= DROPEFFECT_COPY; + } + if (aActionType & DRAGDROP_ACTION_MOVE) { + effects |= DROPEFFECT_MOVE; + } + if (aActionType & DRAGDROP_ACTION_LINK) { + effects |= DROPEFFECT_LINK; + } + + // XXX not sure why we bother to cache this, it can change during + // the drag + mDragAction = aActionType; + mSentLocalDropEvent = false; + + // Start dragging + StartDragSession(); + OpenDragPopup(); + + RefPtr<IDataObjectAsyncCapability> pAsyncOp; + // Offer to do an async drag + if (SUCCEEDED(aDataObj->QueryInterface(IID_IDataObjectAsyncCapability, + getter_AddRefs(pAsyncOp)))) { + pAsyncOp->SetAsyncMode(VARIANT_TRUE); + } else { + MOZ_ASSERT_UNREACHABLE("When did our data object stop being async"); + } + + // Call the native D&D method + HRESULT res = ::DoDragDrop(aDataObj, nativeDragSrc, effects, &winDropRes); + + // In cases where the drop operation completed outside the application, + // update the source node's DataTransfer dropEffect value so it is up to date. + if (!mSentLocalDropEvent) { + uint32_t dropResult; + // Order is important, since multiple flags can be returned. + if (winDropRes & DROPEFFECT_COPY) + dropResult = DRAGDROP_ACTION_COPY; + else if (winDropRes & DROPEFFECT_LINK) + dropResult = DRAGDROP_ACTION_LINK; + else if (winDropRes & DROPEFFECT_MOVE) + dropResult = DRAGDROP_ACTION_MOVE; + else + dropResult = DRAGDROP_ACTION_NONE; + + if (mDataTransfer) { + if (res == DRAGDROP_S_DROP) // Success + mDataTransfer->SetDropEffectInt(dropResult); + else + mDataTransfer->SetDropEffectInt(DRAGDROP_ACTION_NONE); + } + } + + mUserCancelled = nativeDragSrc->UserCancelled(); + + // We're done dragging, get the cursor position and end the drag + // Use GetMessagePos to get the position of the mouse at the last message + // seen by the event loop. (Bug 489729) + // Note that we must convert this from device pixels back to Windows logical + // pixels (bug 818927). + DWORD pos = ::GetMessagePos(); + POINT cpos; + cpos.x = GET_X_LPARAM(pos); + cpos.y = GET_Y_LPARAM(pos); + if (auto wnd = GetSourceWindow(mSourceDocument)) { + // Convert from screen to client coordinates like nsWindow::InitEvent does. + ::ScreenToClient(wnd, &cpos); + } + SetDragEndPoint(LayoutDeviceIntPoint(cpos.x, cpos.y)); + + ModifierKeyState modifierKeyState; + EndDragSession(true, modifierKeyState.GetModifiers()); + + mDoingDrag = false; + + return DRAGDROP_S_DROP == res ? NS_OK : NS_ERROR_FAILURE; +} + +//------------------------------------------------------------------------- +// Make Sure we have the right kind of object +nsDataObjCollection* nsDragService::GetDataObjCollection( + IDataObject* aDataObj) { + nsDataObjCollection* dataObjCol = nullptr; + if (aDataObj) { + nsIDataObjCollection* dataObj; + if (aDataObj->QueryInterface(IID_IDataObjCollection, (void**)&dataObj) == + S_OK) { + dataObjCol = static_cast<nsDataObjCollection*>(aDataObj); + dataObj->Release(); + } + } + + return dataObjCol; +} + +//------------------------------------------------------------------------- +NS_IMETHODIMP +nsDragService::GetNumDropItems(uint32_t* aNumItems) { + if (!mDataObject) { + *aNumItems = 0; + return NS_OK; + } + + if (IsCollectionObject(mDataObject)) { + nsDataObjCollection* dataObjCol = GetDataObjCollection(mDataObject); + // If the count cannot be determined just return 0. + // This can happen if we have collection data of type + // MULTI_MIME ("Mozilla/IDataObjectCollectionFormat") on the clipboard + // from another process but we can't obtain an IID_IDataObjCollection + // from this process. + *aNumItems = dataObjCol ? dataObjCol->GetNumDataObjects() : 0; + return NS_OK; + } + // Next check if we have a file drop. Return the number of files in + // the file drop as the number of items we have, pretending like we + // actually have > 1 drag item. + FORMATETC fe2; + SET_FORMATETC(fe2, CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + if (SUCCEEDED(mDataObject->QueryGetData(&fe2))) { + STGMEDIUM stm; + if (FAILED(mDataObject->GetData(&fe2, &stm))) { + *aNumItems = 1; + return NS_OK; + } + HDROP hdrop = static_cast<HDROP>(GlobalLock(stm.hGlobal)); + MOZ_ASSERT(hdrop != NULL); + *aNumItems = ::DragQueryFileW(hdrop, 0xFFFFFFFF, nullptr, 0); + ::GlobalUnlock(stm.hGlobal); + ::ReleaseStgMedium(&stm); + // Data may be provided later, so assume we have 1 item + if (*aNumItems == 0) { + *aNumItems = 1; + } + return NS_OK; + } + // Next check if we have a virtual file drop. + SET_FORMATETC(fe2, nsClipboard::GetClipboardFileDescriptorFormatW(), 0, + DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + STGMEDIUM stm; + + if (SUCCEEDED(mDataObject->GetData(&fe2, &stm))) { + LPFILEGROUPDESCRIPTOR pDesc = + static_cast<LPFILEGROUPDESCRIPTOR>(GlobalLock(stm.hGlobal)); + if (pDesc) { + *aNumItems = pDesc->cItems; + } + GlobalUnlock(stm.hGlobal); + ReleaseStgMedium(&stm); + return NS_OK; + } + *aNumItems = 1; + return NS_OK; +} + +//------------------------------------------------------------------------- +NS_IMETHODIMP +nsDragService::GetData(nsITransferable* aTransferable, uint32_t anItem) { + // This typcially happens on a drop, the target would be asking + // for it's transferable to be filled in + // Use a static clipboard utility method for this + if (!mDataObject) return NS_ERROR_FAILURE; + + nsresult dataFound = NS_ERROR_FAILURE; + + if (IsCollectionObject(mDataObject)) { + // multiple items, use |anItem| as an index into our collection + nsDataObjCollection* dataObjCol = GetDataObjCollection(mDataObject); + uint32_t cnt = dataObjCol->GetNumDataObjects(); + if (anItem < cnt) { + IDataObject* dataObj = dataObjCol->GetDataObjectAt(anItem); + dataFound = nsClipboard::GetDataFromDataObject(dataObj, 0, nullptr, + aTransferable); + } else + NS_WARNING("Index out of range!"); + } else { + // If they are asking for item "0", we can just get it... + if (anItem == 0) { + dataFound = nsClipboard::GetDataFromDataObject(mDataObject, anItem, + nullptr, aTransferable); + } else { + // It better be a file drop, or else non-zero indexes are invalid! + FORMATETC fe2; + FORMATETC fe3; + SET_FORMATETC(fe2, CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + SET_FORMATETC(fe3, nsClipboard::GetClipboardFileDescriptorFormatW(), 0, + DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + if (SUCCEEDED(mDataObject->QueryGetData(&fe2)) || + SUCCEEDED(mDataObject->QueryGetData(&fe3))) + dataFound = nsClipboard::GetDataFromDataObject(mDataObject, anItem, + nullptr, aTransferable); + else + NS_WARNING( + "Reqesting non-zero index, but clipboard data is not a " + "collection!"); + } + } + return dataFound; +} + +//--------------------------------------------------------- +NS_IMETHODIMP +nsDragService::SetIDataObject(IDataObject* aDataObj) { + // When the native drag starts the DragService gets + // the IDataObject that is being dragged + NS_IF_RELEASE(mDataObject); + mDataObject = aDataObj; + NS_IF_ADDREF(mDataObject); + + if (MOZ_DRAGSERVICE_LOG_ENABLED()) { + MOZ_DRAGSERVICE_LOG("nsDragService::SetIDataObject (%p)", mDataObject); + IEnumFORMATETC* pEnum = nullptr; + if (mDataObject && + S_OK == mDataObject->EnumFormatEtc(DATADIR_GET, &pEnum)) { + MOZ_DRAGSERVICE_LOG(" formats in DataObject:"); + + FORMATETC fEtc; + while (S_OK == pEnum->Next(1, &fEtc, nullptr)) { + nsAutoString format; + WinUtils::GetClipboardFormatAsString(fEtc.cfFormat, format); + MOZ_DRAGSERVICE_LOG(" FORMAT %s", + NS_ConvertUTF16toUTF8(format).get()); + } + pEnum->Release(); + } + } + + return NS_OK; +} + +//--------------------------------------------------------- +void nsDragService::SetDroppedLocal() { + // Sent from the native drag handler, letting us know + // a drop occurred within the application vs. outside of it. + mSentLocalDropEvent = true; + return; +} + +//------------------------------------------------------------------------- +NS_IMETHODIMP +nsDragService::IsDataFlavorSupported(const char* aDataFlavor, bool* _retval) { + if (!aDataFlavor || !mDataObject || !_retval) { + MOZ_DRAGSERVICE_LOG("%s: error", __PRETTY_FUNCTION__); + return NS_ERROR_FAILURE; + } + + *_retval = false; + auto logging = MakeScopeExit([&] { + MOZ_DRAGSERVICE_LOG("IsDataFlavorSupported: %s is%s found", aDataFlavor, + *_retval ? "" : " not"); + }); + + FORMATETC fe; + UINT format = 0; + + if (IsCollectionObject(mDataObject)) { + // We know we have one of our special collection objects. + format = nsClipboard::GetFormat(aDataFlavor); + SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, + TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI); + + // See if any one of the IDataObjects in the collection supports + // this data type + nsDataObjCollection* dataObjCol = GetDataObjCollection(mDataObject); + if (dataObjCol) { + uint32_t cnt = dataObjCol->GetNumDataObjects(); + for (uint32_t i = 0; i < cnt; ++i) { + IDataObject* dataObj = dataObjCol->GetDataObjectAt(i); + if (S_OK == dataObj->QueryGetData(&fe)) { + *_retval = true; // found it! + } + } + } + return NS_OK; + } + + // Ok, so we have a single object. Check to see if has the correct + // data type. Since this can come from an outside app, we also + // need to see if we need to perform text->unicode conversion if + // the client asked for unicode and it wasn't available. + format = nsClipboard::GetFormat(aDataFlavor); + SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, + TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI); + if (mDataObject->QueryGetData(&fe) == S_OK) { + *_retval = true; // found it! + return NS_OK; + } + + // We haven't found the exact flavor the client asked for, but + // maybe we can still find it from something else that's in the + // data object. + if (strcmp(aDataFlavor, kTextMime) == 0) { + // If unicode wasn't there, it might exist as CF_TEXT, client asked + // for unicode and it wasn't present, check if we + // have CF_TEXT. We'll handle the actual data substitution in + // the data object. + SET_FORMATETC(fe, CF_TEXT, 0, DVASPECT_CONTENT, -1, + TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI); + if (mDataObject->QueryGetData(&fe) == S_OK) { + *_retval = true; // found it! + } + return NS_OK; + } + + if (strcmp(aDataFlavor, kURLMime) == 0) { + // client asked for a url and it wasn't present, but if we + // have a file, then we have a URL to give them (the path, or + // the internal URL if an InternetShortcut). + format = nsClipboard::GetFormat(kFileMime); + SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, + TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI); + if (mDataObject->QueryGetData(&fe) == S_OK) { + *_retval = true; // found it! + } + return NS_OK; + } + + if (format == CF_HDROP) { + // Dragging a link from browsers creates both a URL and a FILE which is a + // *.url shortcut in the data object. The file is useful when dropping in + // Windows Explorer to create a internet shortcut. But when dropping in the + // browser, users do not expect to have this file. So do not try to look up + // virtal file if there is a URL in the data object. + format = nsClipboard::GetFormat(kURLMime); + SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + if (mDataObject->QueryGetData(&fe) == S_OK) { + return NS_OK; + } + + // If the client wants a file, maybe we find a virtual file. + format = nsClipboard::GetClipboardFileDescriptorFormatW(); + SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + if (mDataObject->QueryGetData(&fe) == S_OK) { + *_retval = true; // found it! + } + + // XXX should we fall back to CFSTR_FILEDESCRIPTORA? + return NS_OK; + } + + return NS_OK; +} + +// +// IsCollectionObject +// +// Determine if this is a single |IDataObject| or one of our private +// collection objects. We know the difference because our collection +// object will respond to supporting the private |MULTI_MIME| format. +// +bool nsDragService::IsCollectionObject(IDataObject* inDataObj) { + bool isCollection = false; + + // setup the format object to ask for the MULTI_MIME format. We only + // need to do this once + static UINT sFormat = 0; + static FORMATETC sFE; + if (!sFormat) { + sFormat = nsClipboard::GetFormat(MULTI_MIME); + SET_FORMATETC(sFE, sFormat, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL); + } + + // ask the object if it supports it. If yes, we have a collection + // object + if (inDataObj->QueryGetData(&sFE) == S_OK) isCollection = true; + + return isCollection; + +} // IsCollectionObject + +// +// EndDragSession +// +// Override the default to make sure that we release the data object +// when the drag ends. It seems that OLE doesn't like to let apps quit +// w/out crashing when we're still holding onto their data +// +NS_IMETHODIMP +nsDragService::EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers) { + // Bug 100180: If we've got mouse events captured, make sure we release it - + // that way, if we happen to call EndDragSession before diving into a nested + // event loop, we can still respond to mouse events. + if (::GetCapture()) { + ::ReleaseCapture(); + } + + nsBaseDragService::EndDragSession(aDoneDrag, aKeyModifiers); + NS_IF_RELEASE(mDataObject); + + return NS_OK; +} + +NS_IMETHODIMP +nsDragService::UpdateDragImage(nsINode* aImage, int32_t aImageX, + int32_t aImageY) { + if (!mDataObject) { + return NS_OK; + } + + nsBaseDragService::UpdateDragImage(aImage, aImageX, aImageY); + + IDragSourceHelper* pdsh; + if (SUCCEEDED(CoCreateInstance(CLSID_DragDropHelper, nullptr, + CLSCTX_INPROC_SERVER, IID_IDragSourceHelper, + (void**)&pdsh))) { + SHDRAGIMAGE sdi; + if (CreateDragImage(mSourceNode, Nothing(), &sdi)) { + nsNativeDragTarget::DragImageChanged(); + if (FAILED(pdsh->InitializeFromBitmap(&sdi, mDataObject))) + DeleteObject(sdi.hbmpDragImage); + } + pdsh->Release(); + } + + return NS_OK; +} |