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Mypal/widget/cocoa/nsDragService.mm

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/* -*- 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 "mozilla/Logging.h"
#include "nsArrayUtils.h"
#include "nsDragService.h"
#include "nsArrayUtils.h"
#include "nsObjCExceptions.h"
#include "nsITransferable.h"
#include "nsString.h"
#include "nsClipboard.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsCOMPtr.h"
#include "nsPrimitiveHelpers.h"
#include "nsLinebreakConverter.h"
#include "nsIMacUtils.h"
#include "nsIDOMNode.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "nsIIOService.h"
#include "nsIDocument.h"
#include "nsIContent.h"
#include "nsView.h"
#include "gfxContext.h"
#include "nsCocoaUtils.h"
#include "mozilla/gfx/2D.h"
#include "gfxPlatform.h"
using namespace mozilla;
using namespace mozilla::gfx;
extern PRLogModuleInfo* sCocoaLog;
extern void EnsureLogInitialized();
extern NSPasteboard* globalDragPboard;
extern NSView* gLastDragView;
extern NSEvent* gLastDragMouseDownEvent;
extern bool gUserCancelledDrag;
// This global makes the transferable array available to Cocoa's promised
// file destination callback.
nsIArray *gDraggedTransferables = nullptr;
NSString* const kWildcardPboardType = @"MozillaWildcard";
NSString* const kCorePboardType_url = @"CorePasteboardFlavorType 0x75726C20"; // 'url ' url
NSString* const kCorePboardType_urld = @"CorePasteboardFlavorType 0x75726C64"; // 'urld' desc
NSString* const kCorePboardType_urln = @"CorePasteboardFlavorType 0x75726C6E"; // 'urln' title
NSString* const kUTTypeURLName = @"public.url-name";
NSString* const kCustomTypesPboardType = @"org.mozilla.custom-clipdata";
nsDragService::nsDragService()
{
mNativeDragView = nil;
mNativeDragEvent = nil;
EnsureLogInitialized();
}
nsDragService::~nsDragService()
{
}
static nsresult SetUpDragClipboard(nsIArray* aTransferableArray)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
if (!aTransferableArray)
return NS_ERROR_FAILURE;
uint32_t count = 0;
aTransferableArray->GetLength(&count);
NSPasteboard* dragPBoard = [NSPasteboard pasteboardWithName:NSDragPboard];
for (uint32_t j = 0; j < count; j++) {
nsCOMPtr<nsITransferable> currentTransferable = do_QueryElementAt(aTransferableArray, j);
if (!currentTransferable)
return NS_ERROR_FAILURE;
// Transform the transferable to an NSDictionary
NSDictionary* pasteboardOutputDict = nsClipboard::PasteboardDictFromTransferable(currentTransferable);
if (!pasteboardOutputDict)
return NS_ERROR_FAILURE;
// write everything out to the general pasteboard
unsigned int typeCount = [pasteboardOutputDict count];
NSMutableArray* types = [NSMutableArray arrayWithCapacity:typeCount + 1];
[types addObjectsFromArray:[pasteboardOutputDict allKeys]];
// Gecko is initiating this drag so we always want its own views to consider
// it. Add our wildcard type to the pasteboard to accomplish this.
[types addObject:kWildcardPboardType]; // we don't increase the count for the loop below on purpose
[dragPBoard declareTypes:types owner:nil];
for (unsigned int k = 0; k < typeCount; k++) {
NSString* currentKey = [types objectAtIndex:k];
id currentValue = [pasteboardOutputDict valueForKey:currentKey];
if (currentKey == NSStringPboardType ||
currentKey == kCorePboardType_url ||
currentKey == kCorePboardType_urld ||
currentKey == kCorePboardType_urln) {
[dragPBoard setString:currentValue forType:currentKey];
}
else if (currentKey == NSHTMLPboardType) {
[dragPBoard setString:(nsClipboard::WrapHtmlForSystemPasteboard(currentValue))
forType:currentKey];
}
else if (currentKey == NSTIFFPboardType ||
currentKey == kCustomTypesPboardType) {
[dragPBoard setData:currentValue forType:currentKey];
}
else if (currentKey == NSFilesPromisePboardType ||
currentKey == NSFilenamesPboardType) {
[dragPBoard setPropertyList:currentValue forType:currentKey];
}
}
}
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
NSImage*
nsDragService::ConstructDragImage(nsIDOMNode* aDOMNode,
LayoutDeviceIntRect* aDragRect,
nsIScriptableRegion* aRegion)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(gLastDragView);
RefPtr<SourceSurface> surface;
nsPresContext* pc;
nsresult rv = DrawDrag(aDOMNode, aRegion, mScreenPosition,
aDragRect, &surface, &pc);
if (pc && (!aDragRect->width || !aDragRect->height)) {
// just use some suitable defaults
int32_t size = nsCocoaUtils::CocoaPointsToDevPixels(20, scaleFactor);
aDragRect->SetRect(pc->CSSPixelsToDevPixels(mScreenPosition.x),
pc->CSSPixelsToDevPixels(mScreenPosition.y), size, size);
}
if (NS_FAILED(rv) || !surface)
return nil;
uint32_t width = aDragRect->width;
uint32_t height = aDragRect->height;
RefPtr<DataSourceSurface> dataSurface =
Factory::CreateDataSourceSurface(IntSize(width, height),
SurfaceFormat::B8G8R8A8);
DataSourceSurface::MappedSurface map;
if (!dataSurface->Map(DataSourceSurface::MapType::READ_WRITE, &map)) {
return nil;
}
RefPtr<DrawTarget> dt =
Factory::CreateDrawTargetForData(BackendType::CAIRO,
map.mData,
dataSurface->GetSize(),
map.mStride,
dataSurface->GetFormat());
if (!dt) {
dataSurface->Unmap();
return nil;
}
dt->FillRect(gfx::Rect(0, 0, width, height),
SurfacePattern(surface, ExtendMode::CLAMP),
DrawOptions(1.0f, CompositionOp::OP_SOURCE));
NSBitmapImageRep* imageRep =
[[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
pixelsWide:width
pixelsHigh:height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bytesPerRow:width * 4
bitsPerPixel:32];
uint8_t* dest = [imageRep bitmapData];
for (uint32_t i = 0; i < height; ++i) {
uint8_t* src = map.mData + i * map.mStride;
for (uint32_t j = 0; j < width; ++j) {
// Reduce transparency overall by multipying by a factor. Remember, Alpha
// is premultipled here. Also, Quartz likes RGBA, so do that translation as well.
#ifdef IS_BIG_ENDIAN
dest[0] = uint8_t(src[1] * DRAG_TRANSLUCENCY);
dest[1] = uint8_t(src[2] * DRAG_TRANSLUCENCY);
dest[2] = uint8_t(src[3] * DRAG_TRANSLUCENCY);
dest[3] = uint8_t(src[0] * DRAG_TRANSLUCENCY);
#else
dest[0] = uint8_t(src[2] * DRAG_TRANSLUCENCY);
dest[1] = uint8_t(src[1] * DRAG_TRANSLUCENCY);
dest[2] = uint8_t(src[0] * DRAG_TRANSLUCENCY);
dest[3] = uint8_t(src[3] * DRAG_TRANSLUCENCY);
#endif
src += 4;
dest += 4;
}
}
dataSurface->Unmap();
NSImage* image =
[[NSImage alloc] initWithSize:NSMakeSize(width / scaleFactor,
height / scaleFactor)];
[image addRepresentation:imageRep];
[imageRep release];
return [image autorelease];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
bool
nsDragService::IsValidType(NSString* availableType, bool allowFileURL)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
// Prevent exposing fileURL for non-fileURL type.
// We need URL provided by dropped webloc file, but don't need file's URL.
// kUTTypeFileURL is returned by [NSPasteboard availableTypeFromArray:] for
// kUTTypeURL, since it conforms to kUTTypeURL.
if (!allowFileURL && [availableType isEqualToString:(id)kUTTypeFileURL]) {
return false;
}
return true;
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
}
NSString*
nsDragService::GetStringForType(NSPasteboardItem* item, const NSString* type,
bool allowFileURL)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
NSString* availableType = [item availableTypeFromArray:[NSArray arrayWithObjects:(id)type, nil]];
if (availableType && IsValidType(availableType, allowFileURL)) {
return [item stringForType:(id)availableType];
}
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
NSString*
nsDragService::GetTitleForURL(NSPasteboardItem* item)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
NSString* name = GetStringForType(item, (const NSString*)kUTTypeURLName);
if (name) {
return name;
}
NSString* filePath = GetFilePath(item);
if (filePath) {
return [filePath lastPathComponent];
}
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
NSString*
nsDragService::GetFilePath(NSPasteboardItem* item)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
NSString* urlString = GetStringForType(item, (const NSString*)kUTTypeFileURL, true);
if (urlString) {
NSURL* url = [NSURL URLWithString:urlString];
if (url) {
return [url path];
}
}
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
// We can only invoke NSView's 'dragImage:at:offset:event:pasteboard:source:slideBack:' from
// within NSView's 'mouseDown:' or 'mouseDragged:'. Luckily 'mouseDragged' is always on the
// stack when InvokeDragSession gets called.
nsresult
nsDragService::InvokeDragSessionImpl(nsIArray* aTransferableArray,
nsIScriptableRegion* aDragRgn,
uint32_t aActionType)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
mDataItems = aTransferableArray;
// put data on the clipboard
if (NS_FAILED(SetUpDragClipboard(aTransferableArray)))
return NS_ERROR_FAILURE;
CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(gLastDragView);
LayoutDeviceIntRect dragRect(0, 0, 20, 20);
NSImage* image = ConstructDragImage(mSourceNode, &dragRect, aDragRgn);
if (!image) {
// if no image was returned, just draw a rectangle
NSSize size;
size.width = nsCocoaUtils::DevPixelsToCocoaPoints(dragRect.width, scaleFactor);
size.height = nsCocoaUtils::DevPixelsToCocoaPoints(dragRect.height, scaleFactor);
image = [[NSImage alloc] initWithSize:size];
[image lockFocus];
[[NSColor grayColor] set];
NSBezierPath* path = [NSBezierPath bezierPath];
[path setLineWidth:2.0];
[path moveToPoint:NSMakePoint(0, 0)];
[path lineToPoint:NSMakePoint(0, size.height)];
[path lineToPoint:NSMakePoint(size.width, size.height)];
[path lineToPoint:NSMakePoint(size.width, 0)];
[path lineToPoint:NSMakePoint(0, 0)];
[path stroke];
[image unlockFocus];
}
LayoutDeviceIntPoint pt(dragRect.x, dragRect.YMost());
NSPoint point = nsCocoaUtils::DevPixelsToCocoaPoints(pt, scaleFactor);
point.y = nsCocoaUtils::FlippedScreenY(point.y);
point = nsCocoaUtils::ConvertPointFromScreen([gLastDragView window], point);
NSPoint localPoint = [gLastDragView convertPoint:point fromView:nil];
// Save the transferables away in case a promised file callback is invoked.
gDraggedTransferables = aTransferableArray;
nsBaseDragService::StartDragSession();
nsBaseDragService::OpenDragPopup();
// We need to retain the view and the event during the drag in case either gets destroyed.
mNativeDragView = [gLastDragView retain];
mNativeDragEvent = [gLastDragMouseDownEvent retain];
gUserCancelledDrag = false;
[mNativeDragView dragImage:image
at:localPoint
offset:NSZeroSize
event:mNativeDragEvent
pasteboard:[NSPasteboard pasteboardWithName:NSDragPboard]
source:mNativeDragView
slideBack:YES];
gUserCancelledDrag = false;
if (mDoingDrag)
nsBaseDragService::EndDragSession(false);
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
NS_IMETHODIMP
nsDragService::GetData(nsITransferable* aTransferable, uint32_t aItemIndex)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
if (!aTransferable)
return NS_ERROR_FAILURE;
// get flavor list that includes all acceptable flavors (including ones obtained through conversion)
nsCOMPtr<nsIArray> flavorList;
nsresult rv = aTransferable->FlavorsTransferableCanImport(getter_AddRefs(flavorList));
if (NS_FAILED(rv))
return NS_ERROR_FAILURE;
uint32_t acceptableFlavorCount;
flavorList->GetLength(&acceptableFlavorCount);
// if this drag originated within Mozilla we should just use the cached data from
// when the drag started if possible
if (mDataItems) {
nsCOMPtr<nsITransferable> currentTransferable = do_QueryElementAt(mDataItems, aItemIndex);
if (currentTransferable) {
for (uint32_t i = 0; i < acceptableFlavorCount; i++) {
nsCOMPtr<nsISupportsCString> currentFlavor = do_QueryElementAt(flavorList, i);
if (!currentFlavor)
continue;
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
nsCOMPtr<nsISupports> dataSupports;
uint32_t dataSize = 0;
rv = currentTransferable->GetTransferData(flavorStr, getter_AddRefs(dataSupports), &dataSize);
if (NS_SUCCEEDED(rv)) {
aTransferable->SetTransferData(flavorStr, dataSupports, dataSize);
return NS_OK; // maybe try to fill in more types? Is there a point?
}
}
}
}
// now check the actual clipboard for data
for (uint32_t i = 0; i < acceptableFlavorCount; i++) {
nsCOMPtr<nsISupportsCString> currentFlavor = do_QueryElementAt(flavorList, i);
if (!currentFlavor)
continue;
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
MOZ_LOG(sCocoaLog, LogLevel::Info, ("nsDragService::GetData: looking for clipboard data of type %s\n", flavorStr.get()));
NSArray* droppedItems = [globalDragPboard pasteboardItems];
if (!droppedItems) {
continue;
}
uint32_t itemCount = [droppedItems count];
if (aItemIndex >= itemCount) {
continue;
}
NSPasteboardItem* item = [droppedItems objectAtIndex:aItemIndex];
if (!item) {
continue;
}
if (flavorStr.EqualsLiteral(kFileMime)) {
NSString* filePath = GetFilePath(item);
if (!filePath)
continue;
unsigned int stringLength = [filePath length];
unsigned int dataLength = (stringLength + 1) * sizeof(char16_t); // in bytes
char16_t* clipboardDataPtr = (char16_t*)malloc(dataLength);
if (!clipboardDataPtr)
return NS_ERROR_OUT_OF_MEMORY;
[filePath getCharacters:reinterpret_cast<unichar*>(clipboardDataPtr)];
clipboardDataPtr[stringLength] = 0; // null terminate
nsCOMPtr<nsIFile> file;
rv = NS_NewLocalFile(nsDependentString(clipboardDataPtr), true, getter_AddRefs(file));
free(clipboardDataPtr);
if (NS_FAILED(rv))
continue;
aTransferable->SetTransferData(flavorStr, file, dataLength);
break;
}
else if (flavorStr.EqualsLiteral(kCustomTypesMime)) {
NSString* availableType = [item availableTypeFromArray:[NSArray arrayWithObject:kCustomTypesPboardType]];
if (!availableType || !IsValidType(availableType, false)) {
continue;
}
NSData *pasteboardData = [item dataForType:availableType];
if (!pasteboardData) {
continue;
}
unsigned int dataLength = [pasteboardData length];
void* clipboardDataPtr = malloc(dataLength);
if (!clipboardDataPtr) {
return NS_ERROR_OUT_OF_MEMORY;
}
[pasteboardData getBytes:clipboardDataPtr];
nsCOMPtr<nsISupports> genericDataWrapper;
nsPrimitiveHelpers::CreatePrimitiveForData(flavorStr, clipboardDataPtr, dataLength,
getter_AddRefs(genericDataWrapper));
aTransferable->SetTransferData(flavorStr, genericDataWrapper, sizeof(nsIInputStream*));
free(clipboardDataPtr);
break;
}
NSString* pString = nil;
if (flavorStr.EqualsLiteral(kUnicodeMime)) {
pString = GetStringForType(item, (const NSString*)kUTTypeUTF8PlainText);
} else if (flavorStr.EqualsLiteral(kHTMLMime)) {
pString = GetStringForType(item, (const NSString*)kUTTypeHTML);
} else if (flavorStr.EqualsLiteral(kURLMime)) {
pString = GetStringForType(item, (const NSString*)kUTTypeURL);
if (pString) {
NSString* title = GetTitleForURL(item);
if (!title) {
title = pString;
}
pString = [NSString stringWithFormat:@"%@\n%@", pString, title];
}
} else if (flavorStr.EqualsLiteral(kURLDataMime)) {
pString = GetStringForType(item, (const NSString*)kUTTypeURL);
} else if (flavorStr.EqualsLiteral(kURLDescriptionMime)) {
pString = GetTitleForURL(item);
} else if (flavorStr.EqualsLiteral(kRTFMime)) {
pString = GetStringForType(item, (const NSString*)kUTTypeRTF);
}
if (pString) {
NSData* stringData;
if (flavorStr.EqualsLiteral(kRTFMime)) {
stringData = [pString dataUsingEncoding:NSASCIIStringEncoding];
} else {
stringData = [pString dataUsingEncoding:NSUnicodeStringEncoding];
}
unsigned int dataLength = [stringData length];
void* clipboardDataPtr = malloc(dataLength);
if (!clipboardDataPtr)
return NS_ERROR_OUT_OF_MEMORY;
[stringData getBytes:clipboardDataPtr];
// The DOM only wants LF, so convert from MacOS line endings to DOM line endings.
int32_t signedDataLength = dataLength;
nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(flavorStr, &clipboardDataPtr, &signedDataLength);
dataLength = signedDataLength;
// skip BOM (Byte Order Mark to distinguish little or big endian)
char16_t* clipboardDataPtrNoBOM = (char16_t*)clipboardDataPtr;
if ((dataLength > 2) &&
((clipboardDataPtrNoBOM[0] == 0xFEFF) ||
(clipboardDataPtrNoBOM[0] == 0xFFFE))) {
dataLength -= sizeof(char16_t);
clipboardDataPtrNoBOM += 1;
}
nsCOMPtr<nsISupports> genericDataWrapper;
nsPrimitiveHelpers::CreatePrimitiveForData(flavorStr, clipboardDataPtrNoBOM, dataLength,
getter_AddRefs(genericDataWrapper));
aTransferable->SetTransferData(flavorStr, genericDataWrapper, dataLength);
free(clipboardDataPtr);
break;
}
// We have never supported this on Mac OS X, we should someday. Normally dragging images
// in is accomplished with a file path drag instead of the image data itself.
/*
if (flavorStr.EqualsLiteral(kPNGImageMime) || flavorStr.EqualsLiteral(kJPEGImageMime) ||
flavorStr.EqualsLiteral(kJPGImageMime) || flavorStr.EqualsLiteral(kGIFImageMime)) {
}
*/
}
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
NS_IMETHODIMP
nsDragService::IsDataFlavorSupported(const char *aDataFlavor, bool *_retval)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
*_retval = false;
if (!globalDragPboard)
return NS_ERROR_FAILURE;
nsDependentCString dataFlavor(aDataFlavor);
// first see if we have data for this in our cached transferable
if (mDataItems) {
uint32_t dataItemsCount;
mDataItems->GetLength(&dataItemsCount);
for (unsigned int i = 0; i < dataItemsCount; i++) {
nsCOMPtr<nsITransferable> currentTransferable = do_QueryElementAt(mDataItems, i);
if (!currentTransferable)
continue;
nsCOMPtr<nsIArray> flavorList;
nsresult rv = currentTransferable->FlavorsTransferableCanImport(getter_AddRefs(flavorList));
if (NS_FAILED(rv))
continue;
uint32_t flavorCount;
flavorList->GetLength(&flavorCount);
for (uint32_t j = 0; j < flavorCount; j++) {
nsCOMPtr<nsISupportsCString> currentFlavor = do_QueryElementAt(flavorList, j);
if (!currentFlavor)
continue;
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
if (dataFlavor.Equals(flavorStr)) {
*_retval = true;
return NS_OK;
}
}
}
}
const NSString* type = nil;
bool allowFileURL = false;
if (dataFlavor.EqualsLiteral(kFileMime)) {
type = (const NSString*)kUTTypeFileURL;
allowFileURL = true;
} else if (dataFlavor.EqualsLiteral(kUnicodeMime)) {
type = (const NSString*)kUTTypeUTF8PlainText;
} else if (dataFlavor.EqualsLiteral(kHTMLMime)) {
type = (const NSString*)kUTTypeHTML;
} else if (dataFlavor.EqualsLiteral(kURLMime) ||
dataFlavor.EqualsLiteral(kURLDataMime)) {
type = (const NSString*)kUTTypeURL;
} else if (dataFlavor.EqualsLiteral(kURLDescriptionMime)) {
type = (const NSString*)kUTTypeURLName;
} else if (dataFlavor.EqualsLiteral(kRTFMime)) {
type = (const NSString*)kUTTypeRTF;
} else if (dataFlavor.EqualsLiteral(kCustomTypesMime)) {
type = (const NSString*)kCustomTypesPboardType;
}
NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObjects:(id)type, nil]];
if (availableType && IsValidType(availableType, allowFileURL)) {
*_retval = true;
}
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
NS_IMETHODIMP
nsDragService::GetNumDropItems(uint32_t* aNumItems)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
*aNumItems = 0;
// first check to see if we have a number of items cached
if (mDataItems) {
mDataItems->GetLength(aNumItems);
return NS_OK;
}
NSArray* droppedItems = [globalDragPboard pasteboardItems];
if (droppedItems) {
*aNumItems = [droppedItems count];
}
return NS_OK;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
NS_IMETHODIMP
nsDragService::EndDragSession(bool aDoneDrag)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
if (mNativeDragView) {
[mNativeDragView release];
mNativeDragView = nil;
}
if (mNativeDragEvent) {
[mNativeDragEvent release];
mNativeDragEvent = nil;
}
mUserCancelled = gUserCancelledDrag;
nsresult rv = nsBaseDragService::EndDragSession(aDoneDrag);
mDataItems = nullptr;
return rv;
NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}
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