Add m-esr52 at 52.6.0

1 files changed, 641 insertions, 0 deletions

diff --git a/widget/windows/nsDragService.cpp b/widget/windows/nsDragService.cpp
new file mode 100644
index 000000000..0040f550f
--- /dev/null
+++ b/widget/windows/nsDragService.cpp
@@ -0,0 +1,641 @@
+/* -*- 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 "nsIDocument.h"
+#include "nsDataObjCollection.h"
+
+#include "nsArrayUtils.h"
+#include "nsString.h"
+#include "nsEscape.h"
+#include "nsIScreenManager.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIURL.h"
+#include "nsCWebBrowserPersist.h"
+#include "nsToolkit.h"
+#include "nsCRT.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsUnicharUtils.h"
+#include "gfxContext.h"
+#include "nsRect.h"
+#include "nsMathUtils.h"
+#include "WinUtils.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/DataSurfaceHelpers.h"
+#include "mozilla/gfx/Tools.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+//-------------------------------------------------------------------------
+//
+// DragService constructor
+//
+//-------------------------------------------------------------------------
+nsDragService::nsDragService()
+  : mDataObject(nullptr), mSentLocalDropEvent(false)
+{
+}
+
+//-------------------------------------------------------------------------
+//
+// DragService destructor
+//
+//-------------------------------------------------------------------------
+nsDragService::~nsDragService()
+{
+  NS_IF_RELEASE(mDataObject);
+}
+
+bool
+nsDragService::CreateDragImage(nsIDOMNode *aDOMNode,
+                               nsIScriptableRegion *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;
+
+    LayoutDeviceIntPoint screenPoint =
+      ConvertToUnscaledDevPixels(pc, mScreenPosition);
+    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,
+                                     nsIScriptableRegion* aRegion,
+                                     uint32_t aActionType)
+{
+  // Try and get source URI of the items that are being dragged
+  nsIURI *uri = nullptr;
+
+  nsCOMPtr<nsIDocument> doc(do_QueryInterface(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) {
+        // set the requestingPrincipal on the transferable
+        nsCOMPtr<nsINode> node = do_QueryInterface(mSourceNode);
+        trans->SetRequestingPrincipal(node->NodePrincipal());
+        trans->SetContentPolicyType(mContentPolicyType);
+        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) {
+      // set the requestingPrincipal on the transferable
+      nsCOMPtr<nsINode> node = do_QueryInterface(mSourceNode);
+      trans->SetRequestingPrincipal(node->NodePrincipal());
+      trans->SetContentPolicyType(mContentPolicyType);
+      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 bool
+LayoutDevicePointToCSSPoint(const LayoutDevicePoint& aDevPos,
+                            CSSPoint& aCSSPos)
+{
+  nsCOMPtr<nsIScreenManager> screenMgr =
+    do_GetService("@mozilla.org/gfx/screenmanager;1");
+  if (!screenMgr) {
+    return false;
+  }
+
+  nsCOMPtr<nsIScreen> screen;
+  screenMgr->ScreenForRect(NSToIntRound(aDevPos.x), NSToIntRound(aDevPos.y),
+                           1, 1, getter_AddRefs(screen));
+  if (!screen) {
+    return false;
+  }
+
+  int32_t w,h; // unused
+  LayoutDeviceIntPoint screenOriginDev;
+  screen->GetRect(&screenOriginDev.x, &screenOriginDev.y, &w, &h);
+
+  double scale;
+  screen->GetDefaultCSSScaleFactor(&scale);
+  LayoutDeviceToCSSScale devToCSSScale =
+    CSSToLayoutDeviceScale(scale).Inverse();
+
+  // Desktop pixels and CSS pixels share the same screen origin.
+  CSSIntPoint screenOriginCSS;
+  screen->GetRectDisplayPix(&screenOriginCSS.x, &screenOriginCSS.y, &w, &h);
+
+  aCSSPos = (aDevPos - screenOriginDev) * devToCSSScale + screenOriginCSS;
+  return true;
+}
+
+//-------------------------------------------------------------------------
+NS_IMETHODIMP
+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<IAsyncOperation> pAsyncOp;
+  // Offer to do an async drag
+  if (SUCCEEDED(aDataObj->QueryInterface(IID_IAsyncOperation,
+                                         getter_AddRefs(pAsyncOp)))) {
+    pAsyncOp->SetAsyncMode(VARIANT_TRUE);
+  } else {
+    NS_NOTREACHED("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 nsIDOMDataTransfer 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();
+  CSSPoint cssPos;
+  if (!LayoutDevicePointToCSSPoint(LayoutDevicePoint(GET_X_LPARAM(pos),
+                                                     GET_Y_LPARAM(pos)),
+                                   cssPos)) {
+    // fallback to the simple scaling
+    POINT pt = { GET_X_LPARAM(pos), GET_Y_LPARAM(pos) };
+    HMONITOR monitor = ::MonitorFromPoint(pt, MONITOR_DEFAULTTOPRIMARY);
+    double dpiScale = widget::WinUtils::LogToPhysFactor(monitor);
+    cssPos.x = GET_X_LPARAM(pos) / dpiScale;
+    cssPos.y = GET_Y_LPARAM(pos) / dpiScale;
+  }
+  // We have to abuse SetDragEndPoint to pass CSS pixels because
+  // Event::GetScreenCoords will not convert pixels for dragend events
+  // until bug 1224754 is fixed.
+  SetDragEndPoint(LayoutDeviceIntPoint(NSToIntRound(cssPos.x),
+                                       NSToIntRound(cssPos.y)));
+  EndDragSession(true);
+
+  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 (dataObjCol) {
+      *aNumItems = dataObjCol->GetNumDataObjects();
+    }
+    else {
+      // 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 = 0;
+    }
+  }
+  else {
+    // 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 (mDataObject->QueryGetData(&fe2) == S_OK) {
+      STGMEDIUM stm;
+      if (mDataObject->GetData(&fe2, &stm) == S_OK) {
+        HDROP hdrop = (HDROP)GlobalLock(stm.hGlobal);
+        *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;
+      }
+      else
+        *aNumItems = 1;
+    }
+    else
+      *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;
+      SET_FORMATETC(fe2, CF_HDROP, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
+      if (mDataObject->QueryGetData(&fe2) == S_OK)
+        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);
+
+  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)
+    return NS_ERROR_FAILURE;
+
+#ifdef DEBUG
+  if (strcmp(aDataFlavor, kTextMime) == 0)
+    NS_WARNING("DO NOT USE THE text/plain DATA FLAVOR ANY MORE. USE text/unicode INSTEAD");
+#endif
+
+  *_retval = false;
+
+  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!
+      }
+    }
+  } // if special collection object
+  else {
+    // 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!
+    else {
+      // We haven't found the exact flavor the client asked for, but
+      // maybe we can still find it from something else that's on the
+      // clipboard
+      if (strcmp(aDataFlavor, kUnicodeMime) == 0) {
+        // 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.
+        format = nsClipboard::GetFormat(kTextMime);
+        SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1,
+                      TYMED_HGLOBAL | TYMED_FILE | TYMED_GDI);
+        if (mDataObject->QueryGetData(&fe) == S_OK)
+          *_retval = true;                 // found it!
+      }
+      else 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!
+      }
+    } // else try again
+  }
+
+  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)
+{
+  // 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);
+  NS_IF_RELEASE(mDataObject);
+
+  return NS_OK;
+}