Tools/TestWebKitAPI/mac/DragAndDropSimulatorMac.mm - WebKit - Git at Google

 /*
  * Copyright (C) 2018 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 #import "config.h"
 #import "DragAndDropSimulator.h"

 #if ENABLE(DRAG_SUPPORT) && PLATFORM(MAC)

 #import "PlatformUtilities.h"
 #import "TestDraggingInfo.h"
 #import "TestWKWebView.h"
 #import <cmath>
 #import <wtf/WeakObjCPtr.h>

 @class DragAndDropTestWKWebView;

 @interface DragAndDropSimulator ()
 - (void)beginDraggingSessionInWebView:(DragAndDropTestWKWebView *)webView withItems:(NSArray<NSDraggingItem *> *)items source:(id<NSDraggingSource>)source;
 - (void)performDragInWebView:(DragAndDropTestWKWebView *)webView atLocation:(NSPoint)viewLocation withImage:(NSImage *)image pasteboard:(NSPasteboard *)pasteboard source:(id)source;
 @property (nonatomic, readonly) NSDraggingSession *draggingSession;
 @end

 @interface DragAndDropTestWKWebView : TestWKWebView
 @end

 @implementation DragAndDropTestWKWebView {
     WeakObjCPtr<DragAndDropSimulator> _dragAndDropSimulator;
 }

 - (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration simulator:(DragAndDropSimulator *)simulator
 {
     if (self = [super initWithFrame:frame configuration:configuration])
         _dragAndDropSimulator = simulator;
     return self;
 }

 IGNORE_WARNINGS_BEGIN("deprecated-implementations")
 - (void)dragImage:(NSImage *)image at:(NSPoint)viewLocation offset:(NSSize)initialOffset event:(NSEvent *)event pasteboard:(NSPasteboard *)pboard source:(id)sourceObj slideBack:(BOOL)slideFlag
 IGNORE_WARNINGS_END
 {
     [_dragAndDropSimulator performDragInWebView:self atLocation:viewLocation withImage:image pasteboard:pboard source:sourceObj];
 }

 - (NSDraggingSession *)beginDraggingSessionWithItems:(NSArray<NSDraggingItem *> *)items event:(NSEvent *)event source:(id<NSDraggingSource>)source
 {
     [_dragAndDropSimulator beginDraggingSessionInWebView:self withItems:items source:source];
     return [_dragAndDropSimulator draggingSession];
 }

 - (void)waitForPendingMouseEvents
 {
     __block bool doneProcessMouseEvents = false;
     [self _doAfterProcessingAllPendingMouseEvents:^{
         doneProcessMouseEvents = true;
     }];
     TestWebKitAPI::Util::run(&doneProcessMouseEvents);
 }

 @end

 // This exceeds the default drag hysteresis of all potential drag types.
 const double initialMouseDragDistance = 45;
 const double dragUpdateProgressIncrement = 0.05;

 static NSImage *defaultExternalDragImage()
 {
     return [[[NSImage alloc] initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"icon" withExtension:@"png" subdirectory:@"TestWebKitAPI.resources"]] autorelease];
 }

 @implementation DragAndDropSimulator {
     RetainPtr<DragAndDropTestWKWebView> _webView;
     RetainPtr<TestDraggingInfo> _draggingInfo;
     RetainPtr<NSPasteboard> _externalDragPasteboard;
     RetainPtr<NSImage> _externalDragImage;
     RetainPtr<NSArray<NSURL *>> _externalPromisedFiles;
     RetainPtr<NSMutableArray<_WKAttachment *>> _insertedAttachments;
     RetainPtr<NSMutableArray<_WKAttachment *>> _removedAttachments;
     RetainPtr<NSMutableArray<NSURL *>> _filePromiseDestinationURLs;
     RetainPtr<NSDraggingSession> _draggingSession;
     RetainPtr<NSMutableArray<NSFilePromiseProvider *>> _filePromiseProviders;
     BlockPtr<void()> _willEndDraggingHandler;
     NSPoint _startLocationInWindow;
     NSPoint _endLocationInWindow;
     double _progress;
     bool _doneWaitingForDraggingSession;
     bool _doneWaitingForDrop;
 }

 @synthesize currentDragOperation=_currentDragOperation;
 @synthesize initialDragImageLocationInView=_initialDragImageLocationInView;

 - (instancetype)initWithWebViewFrame:(CGRect)frame
 {
     return [self initWithWebViewFrame:frame configuration:nil];
 }

 - (instancetype)initWithWebViewFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
 {
     if (self = [super init]) {
         _webView = adoptNS([[DragAndDropTestWKWebView alloc] initWithFrame:frame configuration:configuration ?: [[[WKWebViewConfiguration alloc] init] autorelease] simulator:self]);
         _filePromiseDestinationURLs = adoptNS([NSMutableArray new]);
         [_webView setUIDelegate:self];
         self.dragDestinationAction = WKDragDestinationActionAny & ~WKDragDestinationActionLoad;
     }
     return self;
 }

 - (void)dealloc
 {
     for (NSURL *url in _filePromiseDestinationURLs.get())
         [[NSFileManager defaultManager] removeItemAtURL:url error:nil];

     [super dealloc];
 }

 - (NSPoint)flipAboutXAxisInHostWindow:(NSPoint)point
 {
     return { point.x, NSHeight([[_webView hostWindow] frame]) - point.y };
 }

 - (NSPoint)locationInViewForCurrentProgress
 {
     return {
         _startLocationInWindow.x + (_endLocationInWindow.x - _startLocationInWindow.x) * _progress,
         _startLocationInWindow.y + (_endLocationInWindow.y - _startLocationInWindow.y) * _progress
     };
 }

 - (double)initialProgressForMouseDrag
 {
     double totalDistance = std::sqrt(std::pow(_startLocationInWindow.x - _endLocationInWindow.x, 2) + std::pow(_startLocationInWindow.y - _endLocationInWindow.y, 2));
     return !totalDistance ? 1 : std::min<double>(1, initialMouseDragDistance / totalDistance);
 }

 - (void)runFrom:(CGPoint)flippedStartLocation to:(CGPoint)flippedEndLocation
 {
     _insertedAttachments = adoptNS([NSMutableArray new]);
     _removedAttachments = adoptNS([NSMutableArray new]);
     _doneWaitingForDraggingSession = true;
     _doneWaitingForDrop = true;
     _startLocationInWindow = [self flipAboutXAxisInHostWindow:flippedStartLocation];
     _endLocationInWindow = [self flipAboutXAxisInHostWindow:flippedEndLocation];
     _currentDragOperation = NSDragOperationNone;
     _draggingInfo = nil;
     _draggingSession = nil;
     _progress = 0;
     _filePromiseProviders = adoptNS([NSMutableArray new]);

     if (NSPasteboard *pasteboard = self.externalDragPasteboard) {
         NSPoint startLocationInView = [_webView convertPoint:_startLocationInWindow fromView:nil];
         NSImage *dragImage = self.externalDragImage ?: defaultExternalDragImage();
         [self performDragInWebView:_webView.get() atLocation:startLocationInView withImage:dragImage pasteboard:pasteboard source:nil];
         TestWebKitAPI::Util::run(&_doneWaitingForDrop);
         return;
     }

     _progress = [self initialProgressForMouseDrag];
     if (_progress == 1) {
         [NSException raise:@"DragAndDropSimulator" format:@"Drag start (%@) and drag end (%@) locations are too close!", NSStringFromPoint(flippedStartLocation), NSStringFromPoint(flippedEndLocation)];
         return;
     }

     [_webView mouseEnterAtPoint:_startLocationInWindow];
     [_webView mouseMoveToPoint:_startLocationInWindow withFlags:0];
     [_webView mouseDownAtPoint:_startLocationInWindow simulatePressure:NO];
     [_webView mouseDragToPoint:[self locationInViewForCurrentProgress]];
     [_webView waitForPendingMouseEvents];

     TestWebKitAPI::Util::run(&_doneWaitingForDraggingSession);

     [_webView mouseUpAtPoint:_endLocationInWindow];
     [_webView waitForPendingMouseEvents];

     TestWebKitAPI::Util::run(&_doneWaitingForDrop);
 }

 - (void)beginDraggingSessionInWebView:(DragAndDropTestWKWebView *)webView withItems:(NSArray<NSDraggingItem *> *)items source:(id<NSDraggingSource>)source
 {
     NSMutableArray *pasteboardObjects = [NSMutableArray arrayWithCapacity:items.count];
     NSMutableArray<NSString *> *promisedFileTypes = [NSMutableArray array];
     for (NSDraggingItem *item in items) {
         id pasteboardObject = item.item;
         [pasteboardObjects addObject:pasteboardObject];
         if ([pasteboardObject isKindOfClass:[NSFilePromiseProvider class]]) {
             [_filePromiseProviders addObject:pasteboardObject];
             [promisedFileTypes addObject:[(NSFilePromiseProvider *)pasteboardObject fileType]];
         }
     }

     NSPasteboard *pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
     [pasteboard clearContents];
     [pasteboard writeObjects:pasteboardObjects];
     if (promisedFileTypes.count) {
         // Match AppKit behavior by writing legacy file promise types to the pasteboard as well.
         [pasteboard setPropertyList:promisedFileTypes forType:NSFilesPromisePboardType];
         [pasteboard addTypes:@[@"NSPromiseContentsPboardType", (NSString *)kPasteboardTypeFileURLPromise] owner:nil];
     }

     _draggingSession = adoptNS([[NSDraggingSession alloc] init]);
     _doneWaitingForDraggingSession = false;
     _initialDragImageLocationInView = items[0].draggingFrame.origin;
     id dragImageContents = items[0].imageComponents.firstObject.contents;
     [self initializeDraggingInfo:pasteboard dragImage:[dragImageContents isKindOfClass:[NSImage class]] ? dragImageContents : nil source:source];

     _currentDragOperation = [_webView draggingEntered:_draggingInfo.get()];
     [_webView waitForNextPresentationUpdate];
     [self performSelector:@selector(continueDragSession) withObject:nil afterDelay:0];
 }

 - (void)continueDragSession
 {
     _progress = std::min<double>(1, _progress + dragUpdateProgressIncrement);

     if (_progress < 1) {
         [_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
         _currentDragOperation = [_webView draggingUpdated:_draggingInfo.get()];
         [_webView waitForNextPresentationUpdate];
         [self performSelector:@selector(continueDragSession) withObject:nil afterDelay:0];
         return;
     }

     [_draggingInfo setDraggingLocation:_endLocationInWindow];

     if (_willEndDraggingHandler)
         _willEndDraggingHandler();

     if (_currentDragOperation != NSDragOperationNone && [_webView prepareForDragOperation:_draggingInfo.get()]) {
         _doneWaitingForDrop = false;
         [_webView performDragOperation:_draggingInfo.get()];
     } else if (_currentDragOperation == NSDragOperationNone)
         [_webView draggingExited:_draggingInfo.get()];
     [_webView waitForNextPresentationUpdate];
     [(id <NSDraggingSource>)_webView.get() draggingSession:_draggingSession.get() endedAtPoint:_endLocationInWindow operation:_currentDragOperation];

     _doneWaitingForDraggingSession = true;
 }

 - (void)performDragInWebView:(DragAndDropTestWKWebView *)webView atLocation:(NSPoint)viewLocation withImage:(NSImage *)image pasteboard:(NSPasteboard *)pasteboard source:(id)source
 {
     _initialDragImageLocationInView = viewLocation;
     [self initializeDraggingInfo:pasteboard dragImage:image source:source];

     _currentDragOperation = [_webView draggingEntered:_draggingInfo.get()];
     [_webView waitForNextPresentationUpdate];

     while (_progress != 1) {
         _progress = std::min<double>(1, _progress + dragUpdateProgressIncrement);
         [_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
         _currentDragOperation = [_webView draggingUpdated:_draggingInfo.get()];
         [_webView waitForNextPresentationUpdate];
     }

     [_draggingInfo setDraggingLocation:_endLocationInWindow];

     if (_willEndDraggingHandler)
         _willEndDraggingHandler();

     if (_currentDragOperation != NSDragOperationNone && [_webView prepareForDragOperation:_draggingInfo.get()]) {
         _doneWaitingForDrop = false;
         [_webView performDragOperation:_draggingInfo.get()];
     } else if (_currentDragOperation == NSDragOperationNone)
         [_webView draggingExited:_draggingInfo.get()];
     [_webView waitForNextPresentationUpdate];

     if (!self.externalDragPasteboard) {
         [_webView draggedImage:[_draggingInfo draggedImage] endedAt:_endLocationInWindow operation:_currentDragOperation];
         [_webView waitForNextPresentationUpdate];
     }
 }

 - (void)initializeDraggingInfo:(NSPasteboard *)pasteboard dragImage:(NSImage *)image source:(id)source
 {
     _draggingInfo = adoptNS([[TestDraggingInfo alloc] initWithDragAndDropSimulator:self]);
     [_draggingInfo setDraggedImage:image];
     [_draggingInfo setDraggingPasteboard:pasteboard];
     [_draggingInfo setDraggingSource:source];
     [_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
     [_draggingInfo setDraggingSourceOperationMask:NSDragOperationEvery];
     [_draggingInfo setNumberOfValidItemsForDrop:pasteboard.pasteboardItems.count];
 }

 - (NSArray<_WKAttachment *> *)insertedAttachments
 {
     return _insertedAttachments.get();
 }

 - (NSArray<_WKAttachment *> *)removedAttachments
 {
     return _removedAttachments.get();
 }

 - (TestWKWebView *)webView
 {
     return _webView.get();
 }

 - (void)setExternalDragPasteboard:(NSPasteboard *)externalDragPasteboard
 {
     _externalDragPasteboard = externalDragPasteboard;
 }

 - (NSPasteboard *)externalDragPasteboard
 {
     return _externalDragPasteboard.get();
 }

 - (void)setExternalDragImage:(NSImage *)externalDragImage
 {
     _externalDragImage = externalDragImage;
 }

 - (NSImage *)externalDragImage
 {
     return _externalDragImage.get();
 }

 - (NSDraggingSession *)draggingSession
 {
     return _draggingSession.get();
 }

 - (id <NSDraggingInfo>)draggingInfo
 {
     return _draggingInfo.get();
 }

 - (dispatch_block_t)willEndDraggingHandler
 {
     return _willEndDraggingHandler.get();
 }

 - (void)setWillEndDraggingHandler:(dispatch_block_t)willEndDraggingHandler
 {
     _willEndDraggingHandler = makeBlockPtr(willEndDraggingHandler);
 }

 - (NSArray<NSURL *> *)externalPromisedFiles
 {
     return _externalPromisedFiles.get();
 }

 - (void)clearExternalDragInformation
 {
     _externalPromisedFiles = nil;
     _externalDragImage = nil;
     _externalDragPasteboard = nil;
 }

 static BOOL getFilePathsAndTypeIdentifiers(NSArray<NSURL *> *fileURLs, NSArray<NSString *> **outFilePaths, NSArray<NSString *> **outTypeIdentifiers)
 {
     NSMutableArray *filePaths = [NSMutableArray arrayWithCapacity:fileURLs.count];
     NSMutableArray *typeIdentifiers = [NSMutableArray arrayWithCapacity:fileURLs.count];
     for (NSURL *url in fileURLs) {
         NSString *typeIdentifier = nil;
         NSError *error = nil;
         BOOL foundUTI = [url getResourceValue:&typeIdentifier forKey:NSURLTypeIdentifierKey error:&error];
         if (!foundUTI || error) {
             [NSException raise:@"DragAndDropSimulator" format:@"Failed to get UTI for promised file: %@ with error: %@", url, error];
             continue;
         }
         [typeIdentifiers addObject:typeIdentifier];
         [filePaths addObject:url.path];
     }

     if (fileURLs.count != filePaths.count)
         return NO;

     if (outTypeIdentifiers)
         *outTypeIdentifiers = typeIdentifiers;

     if (outFilePaths)
         *outFilePaths = filePaths;

     return YES;
 }

 - (void)writePromisedFiles:(NSArray<NSURL *> *)fileURLs
 {
     NSArray *paths = nil;
     NSArray *types = nil;
     if (!getFilePathsAndTypeIdentifiers(fileURLs, &paths, &types))
         return;

     NSMutableArray *names = [NSMutableArray arrayWithCapacity:paths.count];
     for (NSString *path in paths)
         [names addObject:path.lastPathComponent];

     _externalPromisedFiles = fileURLs;
     _externalDragPasteboard = [NSPasteboard pasteboardWithUniqueName];
     [_externalDragPasteboard declareTypes:@[NSFilesPromisePboardType, NSFilenamesPboardType] owner:nil];
     [_externalDragPasteboard setPropertyList:types forType:NSFilesPromisePboardType];
     [_externalDragPasteboard setPropertyList:names forType:NSFilenamesPboardType];
 }

 - (void)writeFiles:(NSArray<NSURL *> *)fileURLs
 {
     NSArray *paths = nil;
     if (!getFilePathsAndTypeIdentifiers(fileURLs, &paths, nil))
         return;

     _externalDragPasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
     [_externalDragPasteboard declareTypes:@[NSFilenamesPboardType] owner:nil];
     [_externalDragPasteboard setPropertyList:paths forType:NSFilenamesPboardType];
 }

 - (NSArray<NSURL *> *)receivePromisedFiles
 {
     auto destinationURLs = adoptNS([NSMutableArray new]);
     for (NSFilePromiseProvider *provider in _filePromiseProviders.get()) {
         if (!provider.delegate)
             continue;

         int suffix = 1;
         NSString *baseFileName = [provider.delegate filePromiseProvider:provider fileNameForType:provider.fileType];
         NSString *uniqueFileName = baseFileName;
         while ([[NSFileManager defaultManager] fileExistsAtPath:[NSTemporaryDirectory() stringByAppendingPathComponent:uniqueFileName]])
             uniqueFileName = [NSString stringWithFormat:@"%@ %d", baseFileName, ++suffix];

         NSURL *destinationURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:uniqueFileName]];
         __block bool done = false;
         [provider.delegate filePromiseProvider:provider writePromiseToURL:destinationURL completionHandler:^(NSError *) {
             done = true;
         }];
         TestWebKitAPI::Util::run(&done);
         [destinationURLs addObject:destinationURL];
         [_filePromiseDestinationURLs addObject:destinationURL];
     }
     return destinationURLs.autorelease();
 }

 - (void)endDataTransfer
 {
 }

 #pragma mark - WKUIDelegatePrivate

 - (void)_webView:(WKWebView *)webView didInsertAttachment:(_WKAttachment *)attachment withSource:(NSString *)source
 {
     [_insertedAttachments addObject:attachment];
 }

 - (void)_webView:(WKWebView *)webView didRemoveAttachment:(_WKAttachment *)attachment
 {
     [_removedAttachments addObject:attachment];
 }

 - (void)_webView:(WKWebView *)webView didPerformDragOperation:(BOOL)handled
 {
     _doneWaitingForDrop = true;
 }

 - (WKDragDestinationAction)_webView:(WKWebView *)webView dragDestinationActionMaskForDraggingInfo:(id)draggingInfo
 {
     return self.dragDestinationAction;
 }

 @end

 #endif // ENABLE(DRAG_SUPPORT) && PLATFORM(MAC)
	/*
	* Copyright (C) 2018 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#import "config.h"
	#import "DragAndDropSimulator.h"

	#if ENABLE(DRAG_SUPPORT) && PLATFORM(MAC)

	#import "PlatformUtilities.h"
	#import "TestDraggingInfo.h"
	#import "TestWKWebView.h"
	#import <cmath>
	#import <wtf/WeakObjCPtr.h>

	@class DragAndDropTestWKWebView;

	@interface DragAndDropSimulator ()
	- (void)beginDraggingSessionInWebView:(DragAndDropTestWKWebView )webView withItems:(NSArray<NSDraggingItem > *)items source:(id<NSDraggingSource>)source;
	- (void)performDragInWebView:(DragAndDropTestWKWebView )webView atLocation:(NSPoint)viewLocation withImage:(NSImage )image pasteboard:(NSPasteboard *)pasteboard source:(id)source;
	@property (nonatomic, readonly) NSDraggingSession *draggingSession;
	@end

	@interface DragAndDropTestWKWebView : TestWKWebView
	@end

	@implementation DragAndDropTestWKWebView {
	WeakObjCPtr<DragAndDropSimulator> _dragAndDropSimulator;
	}

	- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration )configuration simulator:(DragAndDropSimulator )simulator
	{
	if (self = [super initWithFrame:frame configuration:configuration])
	_dragAndDropSimulator = simulator;
	return self;
	}

	IGNORE_WARNINGS_BEGIN("deprecated-implementations")
	- (void)dragImage:(NSImage )image at:(NSPoint)viewLocation offset:(NSSize)initialOffset event:(NSEvent )event pasteboard:(NSPasteboard *)pboard source:(id)sourceObj slideBack:(BOOL)slideFlag
	IGNORE_WARNINGS_END
	{
	[_dragAndDropSimulator performDragInWebView:self atLocation:viewLocation withImage:image pasteboard:pboard source:sourceObj];
	}

	- (NSDraggingSession )beginDraggingSessionWithItems:(NSArray<NSDraggingItem > )items event:(NSEvent )event source:(id<NSDraggingSource>)source
	{
	[_dragAndDropSimulator beginDraggingSessionInWebView:self withItems:items source:source];
	return [_dragAndDropSimulator draggingSession];
	}

	- (void)waitForPendingMouseEvents
	{
	__block bool doneProcessMouseEvents = false;
	[self _doAfterProcessingAllPendingMouseEvents:^{
	doneProcessMouseEvents = true;
	}];
	TestWebKitAPI::Util::run(&doneProcessMouseEvents);
	}

	@end

	// This exceeds the default drag hysteresis of all potential drag types.
	const double initialMouseDragDistance = 45;
	const double dragUpdateProgressIncrement = 0.05;

	static NSImage *defaultExternalDragImage()
	{
	return [[[NSImage alloc] initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"icon" withExtension:@"png" subdirectory:@"TestWebKitAPI.resources"]] autorelease];
	}

	@implementation DragAndDropSimulator {
	RetainPtr<DragAndDropTestWKWebView> _webView;
	RetainPtr<TestDraggingInfo> _draggingInfo;
	RetainPtr<NSPasteboard> _externalDragPasteboard;
	RetainPtr<NSImage> _externalDragImage;
	RetainPtr<NSArray<NSURL *>> _externalPromisedFiles;
	RetainPtr<NSMutableArray<_WKAttachment *>> _insertedAttachments;
	RetainPtr<NSMutableArray<_WKAttachment *>> _removedAttachments;
	RetainPtr<NSMutableArray<NSURL *>> _filePromiseDestinationURLs;
	RetainPtr<NSDraggingSession> _draggingSession;
	RetainPtr<NSMutableArray<NSFilePromiseProvider *>> _filePromiseProviders;
	BlockPtr<void()> _willEndDraggingHandler;
	NSPoint _startLocationInWindow;
	NSPoint _endLocationInWindow;
	double _progress;
	bool _doneWaitingForDraggingSession;
	bool _doneWaitingForDrop;
	}

	@synthesize currentDragOperation=_currentDragOperation;
	@synthesize initialDragImageLocationInView=_initialDragImageLocationInView;

	- (instancetype)initWithWebViewFrame:(CGRect)frame
	{
	return [self initWithWebViewFrame:frame configuration:nil];
	}

	- (instancetype)initWithWebViewFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
	{
	if (self = [super init]) {
	_webView = adoptNS([[DragAndDropTestWKWebView alloc] initWithFrame:frame configuration:configuration ?: [[[WKWebViewConfiguration alloc] init] autorelease] simulator:self]);
	_filePromiseDestinationURLs = adoptNS([NSMutableArray new]);
	[_webView setUIDelegate:self];
	self.dragDestinationAction = WKDragDestinationActionAny & ~WKDragDestinationActionLoad;
	}
	return self;
	}

	- (void)dealloc
	{
	for (NSURL *url in _filePromiseDestinationURLs.get())
	[[NSFileManager defaultManager] removeItemAtURL:url error:nil];

	[super dealloc];
	}

	- (NSPoint)flipAboutXAxisInHostWindow:(NSPoint)point
	{
	return { point.x, NSHeight([[_webView hostWindow] frame]) - point.y };
	}

	- (NSPoint)locationInViewForCurrentProgress
	{
	return {
	_startLocationInWindow.x + (_endLocationInWindow.x - _startLocationInWindow.x) * _progress,
	_startLocationInWindow.y + (_endLocationInWindow.y - _startLocationInWindow.y) * _progress
	};
	}

	- (double)initialProgressForMouseDrag
	{
	double totalDistance = std::sqrt(std::pow(_startLocationInWindow.x - _endLocationInWindow.x, 2) + std::pow(_startLocationInWindow.y - _endLocationInWindow.y, 2));
	return !totalDistance ? 1 : std::min<double>(1, initialMouseDragDistance / totalDistance);
	}

	- (void)runFrom:(CGPoint)flippedStartLocation to:(CGPoint)flippedEndLocation
	{
	_insertedAttachments = adoptNS([NSMutableArray new]);
	_removedAttachments = adoptNS([NSMutableArray new]);
	_doneWaitingForDraggingSession = true;
	_doneWaitingForDrop = true;
	_startLocationInWindow = [self flipAboutXAxisInHostWindow:flippedStartLocation];
	_endLocationInWindow = [self flipAboutXAxisInHostWindow:flippedEndLocation];
	_currentDragOperation = NSDragOperationNone;
	_draggingInfo = nil;
	_draggingSession = nil;
	_progress = 0;
	_filePromiseProviders = adoptNS([NSMutableArray new]);

	if (NSPasteboard *pasteboard = self.externalDragPasteboard) {
	NSPoint startLocationInView = [_webView convertPoint:_startLocationInWindow fromView:nil];
	NSImage *dragImage = self.externalDragImage ?: defaultExternalDragImage();
	[self performDragInWebView:_webView.get() atLocation:startLocationInView withImage:dragImage pasteboard:pasteboard source:nil];
	TestWebKitAPI::Util::run(&_doneWaitingForDrop);
	return;
	}

	_progress = [self initialProgressForMouseDrag];
	if (_progress == 1) {
	[NSException raise:@"DragAndDropSimulator" format:@"Drag start (%@) and drag end (%@) locations are too close!", NSStringFromPoint(flippedStartLocation), NSStringFromPoint(flippedEndLocation)];
	return;
	}

	[_webView mouseEnterAtPoint:_startLocationInWindow];
	[_webView mouseMoveToPoint:_startLocationInWindow withFlags:0];
	[_webView mouseDownAtPoint:_startLocationInWindow simulatePressure:NO];
	[_webView mouseDragToPoint:[self locationInViewForCurrentProgress]];
	[_webView waitForPendingMouseEvents];

	TestWebKitAPI::Util::run(&_doneWaitingForDraggingSession);

	[_webView mouseUpAtPoint:_endLocationInWindow];
	[_webView waitForPendingMouseEvents];

	TestWebKitAPI::Util::run(&_doneWaitingForDrop);
	}

	- (void)beginDraggingSessionInWebView:(DragAndDropTestWKWebView )webView withItems:(NSArray<NSDraggingItem > *)items source:(id<NSDraggingSource>)source
	{
	NSMutableArray *pasteboardObjects = [NSMutableArray arrayWithCapacity:items.count];
	NSMutableArray<NSString > promisedFileTypes = [NSMutableArray array];
	for (NSDraggingItem *item in items) {
	id pasteboardObject = item.item;
	[pasteboardObjects addObject:pasteboardObject];
	if ([pasteboardObject isKindOfClass:[NSFilePromiseProvider class]]) {
	[_filePromiseProviders addObject:pasteboardObject];
	[promisedFileTypes addObject:[(NSFilePromiseProvider *)pasteboardObject fileType]];
	}
	}

	NSPasteboard *pasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
	[pasteboard clearContents];
	[pasteboard writeObjects:pasteboardObjects];
	if (promisedFileTypes.count) {
	// Match AppKit behavior by writing legacy file promise types to the pasteboard as well.
	[pasteboard setPropertyList:promisedFileTypes forType:NSFilesPromisePboardType];
	[pasteboard addTypes:@[@"NSPromiseContentsPboardType", (NSString *)kPasteboardTypeFileURLPromise] owner:nil];
	}

	_draggingSession = adoptNS([[NSDraggingSession alloc] init]);
	_doneWaitingForDraggingSession = false;
	_initialDragImageLocationInView = items[0].draggingFrame.origin;
	id dragImageContents = items[0].imageComponents.firstObject.contents;
	[self initializeDraggingInfo:pasteboard dragImage:[dragImageContents isKindOfClass:[NSImage class]] ? dragImageContents : nil source:source];

	_currentDragOperation = [_webView draggingEntered:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];
	[self performSelector:@selector(continueDragSession) withObject:nil afterDelay:0];
	}

	- (void)continueDragSession
	{
	_progress = std::min<double>(1, _progress + dragUpdateProgressIncrement);

	if (_progress < 1) {
	[_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
	_currentDragOperation = [_webView draggingUpdated:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];
	[self performSelector:@selector(continueDragSession) withObject:nil afterDelay:0];
	return;
	}

	[_draggingInfo setDraggingLocation:_endLocationInWindow];

	if (_willEndDraggingHandler)
	_willEndDraggingHandler();

	if (_currentDragOperation != NSDragOperationNone && [_webView prepareForDragOperation:_draggingInfo.get()]) {
	_doneWaitingForDrop = false;
	[_webView performDragOperation:_draggingInfo.get()];
	} else if (_currentDragOperation == NSDragOperationNone)
	[_webView draggingExited:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];
	[(id <NSDraggingSource>)_webView.get() draggingSession:_draggingSession.get() endedAtPoint:_endLocationInWindow operation:_currentDragOperation];

	_doneWaitingForDraggingSession = true;
	}

	- (void)performDragInWebView:(DragAndDropTestWKWebView )webView atLocation:(NSPoint)viewLocation withImage:(NSImage )image pasteboard:(NSPasteboard *)pasteboard source:(id)source
	{
	_initialDragImageLocationInView = viewLocation;
	[self initializeDraggingInfo:pasteboard dragImage:image source:source];

	_currentDragOperation = [_webView draggingEntered:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];

	while (_progress != 1) {
	_progress = std::min<double>(1, _progress + dragUpdateProgressIncrement);
	[_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
	_currentDragOperation = [_webView draggingUpdated:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];
	}

	[_draggingInfo setDraggingLocation:_endLocationInWindow];

	if (_willEndDraggingHandler)
	_willEndDraggingHandler();

	if (_currentDragOperation != NSDragOperationNone && [_webView prepareForDragOperation:_draggingInfo.get()]) {
	_doneWaitingForDrop = false;
	[_webView performDragOperation:_draggingInfo.get()];
	} else if (_currentDragOperation == NSDragOperationNone)
	[_webView draggingExited:_draggingInfo.get()];
	[_webView waitForNextPresentationUpdate];

	if (!self.externalDragPasteboard) {
	[_webView draggedImage:[_draggingInfo draggedImage] endedAt:_endLocationInWindow operation:_currentDragOperation];
	[_webView waitForNextPresentationUpdate];
	}
	}

	- (void)initializeDraggingInfo:(NSPasteboard )pasteboard dragImage:(NSImage )image source:(id)source
	{
	_draggingInfo = adoptNS([[TestDraggingInfo alloc] initWithDragAndDropSimulator:self]);
	[_draggingInfo setDraggedImage:image];
	[_draggingInfo setDraggingPasteboard:pasteboard];
	[_draggingInfo setDraggingSource:source];
	[_draggingInfo setDraggingLocation:[self locationInViewForCurrentProgress]];
	[_draggingInfo setDraggingSourceOperationMask:NSDragOperationEvery];
	[_draggingInfo setNumberOfValidItemsForDrop:pasteboard.pasteboardItems.count];
	}

	- (NSArray<_WKAttachment > )insertedAttachments
	{
	return _insertedAttachments.get();
	}

	- (NSArray<_WKAttachment > )removedAttachments
	{
	return _removedAttachments.get();
	}

	- (TestWKWebView *)webView
	{
	return _webView.get();
	}

	- (void)setExternalDragPasteboard:(NSPasteboard *)externalDragPasteboard
	{
	_externalDragPasteboard = externalDragPasteboard;
	}

	- (NSPasteboard *)externalDragPasteboard
	{
	return _externalDragPasteboard.get();
	}

	- (void)setExternalDragImage:(NSImage *)externalDragImage
	{
	_externalDragImage = externalDragImage;
	}

	- (NSImage *)externalDragImage
	{
	return _externalDragImage.get();
	}

	- (NSDraggingSession *)draggingSession
	{
	return _draggingSession.get();
	}

	- (id <NSDraggingInfo>)draggingInfo
	{
	return _draggingInfo.get();
	}

	- (dispatch_block_t)willEndDraggingHandler
	{
	return _willEndDraggingHandler.get();
	}

	- (void)setWillEndDraggingHandler:(dispatch_block_t)willEndDraggingHandler
	{
	_willEndDraggingHandler = makeBlockPtr(willEndDraggingHandler);
	}

	- (NSArray<NSURL > )externalPromisedFiles
	{
	return _externalPromisedFiles.get();
	}

	- (void)clearExternalDragInformation
	{
	_externalPromisedFiles = nil;
	_externalDragImage = nil;
	_externalDragPasteboard = nil;
	}

	static BOOL getFilePathsAndTypeIdentifiers(NSArray<NSURL > fileURLs, NSArray<NSString > outFilePaths, NSArray<NSString > **outTypeIdentifiers)
	{
	NSMutableArray *filePaths = [NSMutableArray arrayWithCapacity:fileURLs.count];
	NSMutableArray *typeIdentifiers = [NSMutableArray arrayWithCapacity:fileURLs.count];
	for (NSURL *url in fileURLs) {
	NSString *typeIdentifier = nil;
	NSError *error = nil;
	BOOL foundUTI = [url getResourceValue:&typeIdentifier forKey:NSURLTypeIdentifierKey error:&error];
	if (!foundUTI \|\| error) {
	[NSException raise:@"DragAndDropSimulator" format:@"Failed to get UTI for promised file: %@ with error: %@", url, error];
	continue;
	}
	[typeIdentifiers addObject:typeIdentifier];
	[filePaths addObject:url.path];
	}

	if (fileURLs.count != filePaths.count)
	return NO;

	if (outTypeIdentifiers)
	*outTypeIdentifiers = typeIdentifiers;

	if (outFilePaths)
	*outFilePaths = filePaths;

	return YES;
	}

	- (void)writePromisedFiles:(NSArray<NSURL > )fileURLs
	{
	NSArray *paths = nil;
	NSArray *types = nil;
	if (!getFilePathsAndTypeIdentifiers(fileURLs, &paths, &types))
	return;

	NSMutableArray *names = [NSMutableArray arrayWithCapacity:paths.count];
	for (NSString *path in paths)
	[names addObject:path.lastPathComponent];

	_externalPromisedFiles = fileURLs;
	_externalDragPasteboard = [NSPasteboard pasteboardWithUniqueName];
	[_externalDragPasteboard declareTypes:@[NSFilesPromisePboardType, NSFilenamesPboardType] owner:nil];
	[_externalDragPasteboard setPropertyList:types forType:NSFilesPromisePboardType];
	[_externalDragPasteboard setPropertyList:names forType:NSFilenamesPboardType];
	}

	- (void)writeFiles:(NSArray<NSURL > )fileURLs
	{
	NSArray *paths = nil;
	if (!getFilePathsAndTypeIdentifiers(fileURLs, &paths, nil))
	return;

	_externalDragPasteboard = [NSPasteboard pasteboardWithName:NSDragPboard];
	[_externalDragPasteboard declareTypes:@[NSFilenamesPboardType] owner:nil];
	[_externalDragPasteboard setPropertyList:paths forType:NSFilenamesPboardType];
	}

	- (NSArray<NSURL > )receivePromisedFiles
	{
	auto destinationURLs = adoptNS([NSMutableArray new]);
	for (NSFilePromiseProvider *provider in _filePromiseProviders.get()) {
	if (!provider.delegate)
	continue;

	int suffix = 1;
	NSString *baseFileName = [provider.delegate filePromiseProvider:provider fileNameForType:provider.fileType];
	NSString *uniqueFileName = baseFileName;
	while ([[NSFileManager defaultManager] fileExistsAtPath:[NSTemporaryDirectory() stringByAppendingPathComponent:uniqueFileName]])
	uniqueFileName = [NSString stringWithFormat:@"%@ %d", baseFileName, ++suffix];

	NSURL *destinationURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:uniqueFileName]];
	__block bool done = false;
	[provider.delegate filePromiseProvider:provider writePromiseToURL:destinationURL completionHandler:^(NSError *) {
	done = true;
	}];
	TestWebKitAPI::Util::run(&done);
	[destinationURLs addObject:destinationURL];
	[_filePromiseDestinationURLs addObject:destinationURL];
	}
	return destinationURLs.autorelease();
	}

	- (void)endDataTransfer
	{
	}

	#pragma mark - WKUIDelegatePrivate

	- (void)_webView:(WKWebView )webView didInsertAttachment:(_WKAttachment )attachment withSource:(NSString *)source
	{
	[_insertedAttachments addObject:attachment];
	}

	- (void)_webView:(WKWebView )webView didRemoveAttachment:(_WKAttachment )attachment
	{
	[_removedAttachments addObject:attachment];
	}

	- (void)_webView:(WKWebView *)webView didPerformDragOperation:(BOOL)handled
	{
	_doneWaitingForDrop = true;
	}

	- (WKDragDestinationAction)_webView:(WKWebView *)webView dragDestinationActionMaskForDraggingInfo:(id)draggingInfo
	{
	return self.dragDestinationAction;
	}

	@end

	#endif // ENABLE(DRAG_SUPPORT) && PLATFORM(MAC)