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gecko-dev/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/. */
#ifdef MOZ_LOGGING
#define FORCE_PR_LOG
#endif
#include "prlog.h"
#include "nsDragService.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 "nsNetUtil.h"
#include "nsIDocument.h"
#include "nsIContent.h"
#include "nsView.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "nsCocoaUtils.h"
#ifdef PR_LOGGING
extern PRLogModuleInfo* sCocoaLog;
#endif
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.
nsISupportsArray *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
nsDragService::nsDragService()
{
mNativeDragView = nil;
mNativeDragEvent = nil;
EnsureLogInitialized();
}
nsDragService::~nsDragService()
{
}
static nsresult SetUpDragClipboard(nsISupportsArray* aTransferableArray)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
if (!aTransferableArray)
return NS_ERROR_FAILURE;
uint32_t count = 0;
aTransferableArray->Count(&count);
NSPasteboard* dragPBoard = [NSPasteboard pasteboardWithName:NSDragPboard];
for (uint32_t i = 0; i < count; i++) {
nsCOMPtr<nsISupports> currentTransferableSupports;
aTransferableArray->GetElementAt(i, getter_AddRefs(currentTransferableSupports));
if (!currentTransferableSupports)
return NS_ERROR_FAILURE;
nsCOMPtr<nsITransferable> currentTransferable(do_QueryInterface(currentTransferableSupports));
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 i = 0; i < typeCount; i++) {
NSString* currentKey = [types objectAtIndex:i];
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) {
[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,
nsIntRect* aDragRect,
nsIScriptableRegion* aRegion)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
NSPoint screenPoint =
[[gLastDragView window] convertBaseToScreen:
[gLastDragMouseDownEvent locationInWindow]];
// Y coordinates are bottom to top, so reverse this
screenPoint.y = nsCocoaUtils::FlippedScreenY(screenPoint.y);
CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(gLastDragView);
nsRefPtr<gfxASurface> surface;
nsPresContext* pc;
nsresult rv = DrawDrag(aDOMNode, aRegion,
NSToIntRound(screenPoint.x),
NSToIntRound(screenPoint.y),
aDragRect, getter_AddRefs(surface), &pc);
if (!aDragRect->width || !aDragRect->height) {
// just use some suitable defaults
int32_t size = nsCocoaUtils::CocoaPointsToDevPixels(20, scaleFactor);
aDragRect->SetRect(nsCocoaUtils::CocoaPointsToDevPixels(screenPoint.x, scaleFactor),
nsCocoaUtils::CocoaPointsToDevPixels(screenPoint.y, scaleFactor),
size, size);
}
if (NS_FAILED(rv) || !surface)
return nil;
uint32_t width = aDragRect->width;
uint32_t height = aDragRect->height;
nsRefPtr<gfxImageSurface> imgSurface = new gfxImageSurface(
gfxIntSize(width, height), gfxImageFormatARGB32);
if (!imgSurface)
return nil;
nsRefPtr<gfxContext> context = new gfxContext(imgSurface);
if (!context)
return nil;
context->SetOperator(gfxContext::OPERATOR_SOURCE);
context->SetSource(surface);
context->Paint();
uint32_t* imageData = (uint32_t*)imgSurface->Data();
int32_t stride = imgSurface->Stride();
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 = (uint8_t *)imageData + i * stride;
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;
}
}
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;
}
// 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.
NS_IMETHODIMP
nsDragService::InvokeDragSession(nsIDOMNode* aDOMNode, nsISupportsArray* aTransferableArray,
nsIScriptableRegion* aDragRgn, uint32_t aActionType)
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
nsresult rv = nsBaseDragService::InvokeDragSession(aDOMNode,
aTransferableArray,
aDragRgn, aActionType);
NS_ENSURE_SUCCESS(rv, rv);
mDataItems = aTransferableArray;
// put data on the clipboard
if (NS_FAILED(SetUpDragClipboard(aTransferableArray)))
return NS_ERROR_FAILURE;
nsIntRect dragRect(0, 0, 20, 20);
NSImage* image = ConstructDragImage(aDOMNode, &dragRect, aDragRgn);
if (!image) {
// if no image was returned, just draw a rectangle
NSSize size;
size.width = dragRect.width;
size.height = dragRect.height;
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];
}
nsIntPoint pt(dragRect.x, dragRect.YMost());
CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(gLastDragView);
NSPoint point = nsCocoaUtils::DevPixelsToCocoaPoints(pt, scaleFactor);
point.y = nsCocoaUtils::FlippedScreenY(point.y);
point = [[gLastDragView window] convertScreenToBase: 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<nsISupportsArray> flavorList;
nsresult rv = aTransferable->FlavorsTransferableCanImport(getter_AddRefs(flavorList));
if (NS_FAILED(rv))
return NS_ERROR_FAILURE;
uint32_t acceptableFlavorCount;
flavorList->Count(&acceptableFlavorCount);
// if this drag originated within Mozilla we should just use the cached data from
// when the drag started if possible
if (mDataItems) {
nsCOMPtr<nsISupports> currentTransferableSupports;
mDataItems->GetElementAt(aItemIndex, getter_AddRefs(currentTransferableSupports));
if (currentTransferableSupports) {
nsCOMPtr<nsITransferable> currentTransferable(do_QueryInterface(currentTransferableSupports));
if (currentTransferable) {
for (uint32_t i = 0; i < acceptableFlavorCount; i++) {
nsCOMPtr<nsISupports> genericFlavor;
flavorList->GetElementAt(i, getter_AddRefs(genericFlavor));
nsCOMPtr<nsISupportsCString> currentFlavor(do_QueryInterface(genericFlavor));
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<nsISupports> genericFlavor;
flavorList->GetElementAt(i, getter_AddRefs(genericFlavor));
nsCOMPtr<nsISupportsCString> currentFlavor(do_QueryInterface(genericFlavor));
if (!currentFlavor)
continue;
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
PR_LOG(sCocoaLog, PR_LOG_ALWAYS, ("nsDragService::GetData: looking for clipboard data of type %s\n", flavorStr.get()));
if (flavorStr.EqualsLiteral(kFileMime)) {
NSArray* pFiles = [globalDragPboard propertyListForType:NSFilenamesPboardType];
if (!pFiles || [pFiles count] < (aItemIndex + 1))
continue;
NSString* filePath = [pFiles objectAtIndex:aItemIndex];
if (!filePath)
continue;
unsigned int stringLength = [filePath length];
unsigned int dataLength = (stringLength + 1) * sizeof(PRUnichar); // in bytes
PRUnichar* clipboardDataPtr = (PRUnichar*)malloc(dataLength);
if (!clipboardDataPtr)
return NS_ERROR_OUT_OF_MEMORY;
[filePath getCharacters:reinterpret_cast<unichar*>(clipboardDataPtr)];
clipboardDataPtr[stringLength] = 0; // null terminate
nsCOMPtr<nsIFile> file;
nsresult rv = NS_NewLocalFile(nsDependentString(clipboardDataPtr), true, getter_AddRefs(file));
free(clipboardDataPtr);
if (NS_FAILED(rv))
continue;
aTransferable->SetTransferData(flavorStr, file, dataLength);
break;
}
NSString *pboardType = NSStringPboardType;
if (nsClipboard::IsStringType(flavorStr, &pboardType) ||
flavorStr.EqualsLiteral(kURLMime) ||
flavorStr.EqualsLiteral(kURLDataMime) ||
flavorStr.EqualsLiteral(kURLDescriptionMime)) {
NSString* pString = [globalDragPboard stringForType:pboardType];
if (!pString)
continue;
NSData* 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)
PRUnichar* clipboardDataPtrNoBOM = (PRUnichar*)clipboardDataPtr;
if ((dataLength > 2) &&
((clipboardDataPtrNoBOM[0] == 0xFEFF) ||
(clipboardDataPtrNoBOM[0] == 0xFFFE))) {
dataLength -= sizeof(PRUnichar);
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->Count(&dataItemsCount);
for (unsigned int i = 0; i < dataItemsCount; i++) {
nsCOMPtr<nsISupports> currentTransferableSupports;
mDataItems->GetElementAt(i, getter_AddRefs(currentTransferableSupports));
if (!currentTransferableSupports)
continue;
nsCOMPtr<nsITransferable> currentTransferable(do_QueryInterface(currentTransferableSupports));
if (!currentTransferable)
continue;
nsCOMPtr<nsISupportsArray> flavorList;
nsresult rv = currentTransferable->FlavorsTransferableCanImport(getter_AddRefs(flavorList));
if (NS_FAILED(rv))
continue;
uint32_t flavorCount;
flavorList->Count(&flavorCount);
for (uint32_t j = 0; j < flavorCount; j++) {
nsCOMPtr<nsISupports> genericFlavor;
flavorList->GetElementAt(j, getter_AddRefs(genericFlavor));
nsCOMPtr<nsISupportsCString> currentFlavor(do_QueryInterface(genericFlavor));
if (!currentFlavor)
continue;
nsXPIDLCString flavorStr;
currentFlavor->ToString(getter_Copies(flavorStr));
if (dataFlavor.Equals(flavorStr)) {
*_retval = true;
return NS_OK;
}
}
}
}
NSString *pboardType = nil;
if (dataFlavor.EqualsLiteral(kFileMime)) {
NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObject:NSFilenamesPboardType]];
if (availableType && [availableType isEqualToString:NSFilenamesPboardType])
*_retval = true;
}
else if (dataFlavor.EqualsLiteral(kURLMime)) {
NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObject:kCorePboardType_url]];
if (availableType && [availableType isEqualToString:kCorePboardType_url])
*_retval = true;
}
else if (nsClipboard::IsStringType(dataFlavor, &pboardType)) {
NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObject:pboardType]];
if (availableType && [availableType isEqualToString:pboardType])
*_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->Count(aNumItems);
return NS_OK;
}
// if there is a clipboard and there is something on it, then there is at least 1 item
NSArray* clipboardTypes = [globalDragPboard types];
if (globalDragPboard && [clipboardTypes count] > 0)
*aNumItems = 1;
else
return NS_OK;
// if there is a list of files, send the number of files in that list
NSArray* fileNames = [globalDragPboard propertyListForType:NSFilenamesPboardType];
if (fileNames)
*aNumItems = [fileNames 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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