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cef/cef1/libcef/web_drag_source_mac.mm

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// Copyright (c) 2011 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <sys/param.h>
#include "libcef/browser_impl.h"
#import "libcef/browser_webview_mac.h"
#include "libcef/cef_context.h"
#include "libcef/drag_download_util.h"
#include "libcef/download_util.h"
#import "libcef/web_drag_source_mac.h"
#include "base/files/file_path.h"
#include "base/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/threading/thread.h"
#include "base/threading/thread_restrictions.h"
#include "base/utf_string_conversions.h"
#include "net/base/file_stream.h"
#include "net/base/net_util.h"
#import "third_party/mozilla/NSPasteboard+Utils.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebPoint.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "webkit/glue/webdropdata.h"
using base::SysNSStringToUTF8;
using base::SysUTF8ToNSString;
using base::SysUTF16ToNSString;
using net::FileStream;
using WebKit::WebDragOperationNone;
using WebKit::WebView;
namespace {
// An unofficial standard pasteboard title type to be provided alongside the
// |NSURLPboardType|.
NSString* const kNSURLTitlePboardType = @"public.url-name";
// Converts a string16 into a FilePath. Use this method instead of
// -[NSString fileSystemRepresentation] to prevent exceptions from being thrown.
// See http://crbug.com/78782 for more info.
base::FilePath FilePathFromFilename(const string16& filename) {
NSString* str = SysUTF16ToNSString(filename);
char buf[MAXPATHLEN];
if (![str getFileSystemRepresentation:buf maxLength:sizeof(buf)])
return base::FilePath();
return base::FilePath(buf);
}
// Returns a filename appropriate for the drop data
// TODO(viettrungluu): Refactor to make it common across platforms,
// and move it somewhere sensible.
base::FilePath GetFileNameFromDragData(const WebDropData& drop_data) {
base::FilePath file_name(
FilePathFromFilename(drop_data.file_description_filename));
std::string extension = file_name.Extension();
file_name = file_name.BaseName().RemoveExtension();
// Images without ALT text will only have a file extension so we need to
// synthesize one from the provided extension and URL.
if (file_name.empty()) {
// Retrieve the name from the URL.
string16 suggested_filename =
net::GetSuggestedFilename(drop_data.url, "", "", "", "", "");
file_name = FilePathFromFilename(suggested_filename);
}
return file_name.ReplaceExtension(extension);
}
// This helper's sole task is to write out data for a promised file; the caller
// is responsible for opening the file. It takes the drop data and an open file
// stream.
void PromiseWriterHelper(const WebDropData& drop_data,
scoped_ptr<net::FileStream> file_stream) {
DCHECK(file_stream);
file_stream->WriteSync(drop_data.file_contents.data(),
drop_data.file_contents.length());
}
} // namespace
@interface WebDragSource(Private)
- (void)fillPasteboard;
@end // @interface WebDragSource(Private)
@implementation WebDragSource
- (id)initWithWebView:(BrowserWebView*)view
dropData:(const WebDropData*)dropData
image:(NSImage*)image
offset:(NSPoint)offset
pasteboard:(NSPasteboard*)pboard
dragOperationMask:(NSDragOperation)dragOperationMask {
if ((self = [super init])) {
view_ = view;
DCHECK(view_);
dropData_.reset(new WebDropData(*dropData));
DCHECK(dropData_.get());
if (image == nil) {
// No drag image was provided so create one.
base::FilePath path = _Context->GetResourcesFilePath();
path = path.AppendASCII("urlIcon.png");
image = [[NSImage alloc]
initWithContentsOfFile:SysUTF8ToNSString(path.value())];
}
dragImage_.reset([image retain]);
imageOffset_ = offset;
pasteboard_.reset([pboard retain]);
DCHECK(pasteboard_.get());
dragOperationMask_ = dragOperationMask;
fileExtension_ = nil;
[self fillPasteboard];
}
return self;
}
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
return dragOperationMask_;
}
- (void)lazyWriteToPasteboard:(NSPasteboard*)pboard forType:(NSString*)type {
// NSHTMLPboardType requires the character set to be declared. Otherwise, it
// assumes US-ASCII. Awesome.
static const string16 kHtmlHeader =
ASCIIToUTF16("<meta http-equiv=\"Content-Type\" "
"content=\"text/html;charset=UTF-8\">");
// Be extra paranoid; avoid crashing.
if (!dropData_.get()) {
NOTREACHED() << "No drag-and-drop data available for lazy write.";
return;
}
// HTML.
if ([type isEqualToString:NSHTMLPboardType]) {
DCHECK(!dropData_->html.is_null() && !dropData_->html.string().empty());
// See comment on |kHtmlHeader| above.
[pboard setString:SysUTF16ToNSString(kHtmlHeader + dropData_->html.string())
forType:NSHTMLPboardType];
// URL.
} else if ([type isEqualToString:NSURLPboardType]) {
DCHECK(dropData_->url.is_valid());
NSString* urlStr = SysUTF8ToNSString(dropData_->url.spec());
NSURL* url = [NSURL URLWithString:urlStr];
// If NSURL creation failed, check for a badly-escaped javascript URL.
if (!url && urlStr && dropData_->url.SchemeIs("javascript")) {
NSString *escapedStr =
[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
url = [NSURL URLWithString:escapedStr];
}
[url writeToPasteboard:pboard];
// URL title.
} else if ([type isEqualToString:kNSURLTitlePboardType]) {
[pboard setString:SysUTF16ToNSString(dropData_->url_title)
forType:kNSURLTitlePboardType];
// File contents.
} else if ([type isEqualToString:NSFileContentsPboardType] ||
(fileExtension_ &&
[type isEqualToString:NSCreateFileContentsPboardType(fileExtension_)])) {
// TODO(viettrungluu: find something which is known to accept
// NSFileContentsPboardType to check that this actually works!
scoped_nsobject<NSFileWrapper> file_wrapper(
[[NSFileWrapper alloc] initRegularFileWithContents:[NSData
dataWithBytes:dropData_->file_contents.data()
length:dropData_->file_contents.length()]]);
[file_wrapper setPreferredFilename:SysUTF8ToNSString(
GetFileNameFromDragData(*dropData_).value())];
[pboard writeFileWrapper:file_wrapper];
// TIFF.
} else if ([type isEqualToString:NSTIFFPboardType]) {
// TODO(viettrungluu): This is a bit odd since we rely on Cocoa to render
// our image into a TIFF. This is also suboptimal since this is all done
// synchronously. I'm not sure there's much we can easily do about it.
scoped_nsobject<NSImage> image(
[[NSImage alloc] initWithData:[NSData
dataWithBytes:dropData_->file_contents.data()
length:dropData_->file_contents.length()]]);
[pboard setData:[image TIFFRepresentation] forType:NSTIFFPboardType];
// Plain text.
} else if ([type isEqualToString:NSStringPboardType]) {
DCHECK(!dropData_->text.is_null() && !dropData_->text.string().empty());
[pboard setString:SysUTF16ToNSString(dropData_->text.string())
forType:NSStringPboardType];
// Oops!
} else {
NOTREACHED() << "Asked for a drag pasteboard type we didn't offer.";
}
}
- (NSPoint)convertScreenPoint:(NSPoint)screenPoint {
NSPoint basePoint = [[view_ window] convertScreenToBase:screenPoint];
return [view_ convertPoint:basePoint fromView:nil];
}
- (void)startDrag {
NSEvent* currentEvent = [NSApp currentEvent];
// Synthesize an event for dragging, since we can't be sure that
// [NSApp currentEvent] will return a valid dragging event.
NSWindow* window = [view_ window];
NSPoint position = [window mouseLocationOutsideOfEventStream];
NSTimeInterval eventTime = [currentEvent timestamp];
NSEvent* dragEvent = [NSEvent mouseEventWithType:NSLeftMouseDragged
location:position
modifierFlags:NSLeftMouseDraggedMask
timestamp:eventTime
windowNumber:[window windowNumber]
context:nil
eventNumber:0
clickCount:1
pressure:1.0];
if (dragImage_) {
position.x -= imageOffset_.x;
// Deal with Cocoa's flipped coordinate system.
position.y -= [dragImage_.get() size].height - imageOffset_.y;
}
// Per kwebster, offset arg is ignored, see -_web_DragImageForElement: in
// third_party/WebKit/Source/WebKit/mac/Misc/WebNSViewExtras.m.
[window dragImage:dragImage_
at:position
offset:NSZeroSize
event:dragEvent
pasteboard:pasteboard_
source:view_
slideBack:YES];
}
- (void)endDragAt:(NSPoint)screenPoint
operation:(NSDragOperation)operation {
// Convert |screenPoint| to view coordinates and flip it.
NSWindow* window = [view_ window];
NSPoint localPoint = [self convertScreenPoint:screenPoint];
NSRect viewFrame = [window frame];
localPoint.y = viewFrame.size.height - localPoint.y;
// Flip |screenPoint|.
NSRect screenFrame = [[window screen] frame];
screenPoint.y = screenFrame.size.height - screenPoint.y;
// If AppKit returns a copy and move operation, mask off the move bit
// because WebCore does not understand what it means to do both, which
// results in an assertion failure/renderer crash.
if (operation == (NSDragOperationMove | NSDragOperationCopy))
operation &= ~NSDragOperationMove;
WebView* webview = view_.browser->UIT_GetWebView();
gfx::Point client(localPoint.x, localPoint.y);
gfx::Point screen(screenPoint.x, screenPoint.y);
webview->dragSourceEndedAt(client, screen,
static_cast<WebKit::WebDragOperation>(operation));
// Make sure the pasteboard owner isn't us.
[pasteboard_ declareTypes:[NSArray array] owner:nil];
webview->dragSourceSystemDragEnded();
}
- (void)moveDragTo:(NSPoint)screenPoint {
// Convert |screenPoint| to view coordinates and flip it.
NSWindow* window = [view_ window];
NSPoint localPoint = [self convertScreenPoint:screenPoint];
NSRect viewFrame = [window frame];
localPoint.y = viewFrame.size.height - localPoint.y;
// Flip |screenPoint|.
NSRect screenFrame = [[window screen] frame];
screenPoint.y = screenFrame.size.height - screenPoint.y;
WebView* webview = view_.browser->UIT_GetWebView();
gfx::Point client(localPoint.x, localPoint.y);
gfx::Point screen(screenPoint.x, screenPoint.y);
webview->dragSourceMovedTo(client, screen, WebDragOperationNone);
}
- (NSString*)dragPromisedFileTo:(NSString*)path {
// Be extra paranoid; avoid crashing.
if (!dropData_.get()) {
NOTREACHED() << "No drag-and-drop data available for promised file.";
return nil;
}
base::FilePath fileName = downloadFileName_.empty() ?
GetFileNameFromDragData(*dropData_) : downloadFileName_;
base::FilePath filePath(SysNSStringToUTF8(path));
filePath = filePath.Append(fileName);
// CreateFileStreamForDrop() will call file_util::PathExists(),
// which is blocking. Since this operation is already blocking the
// UI thread on OSX, it should be reasonable to let it happen.
base::ThreadRestrictions::ScopedAllowIO allowIO;
scoped_ptr<FileStream> fileStream(
drag_download_util::CreateFileStreamForDrop(&filePath));
if (!fileStream.get())
return nil;
if (downloadURL_.is_valid()) {
WebView* webview = view_.browser->UIT_GetWebView();
const GURL& page_url = webview->mainFrame()->document().url();
const std::string& page_encoding =
webview->mainFrame()->document().encoding().utf8();
scoped_refptr<DragDownloadFile> dragFileDownloader(new DragDownloadFile(
filePath,
fileStream.Pass(),
downloadURL_,
page_url,
page_encoding,
view_.browser->UIT_GetWebViewDelegate()));
// The finalizer will take care of closing and deletion.
dragFileDownloader->Start(
new drag_download_util::PromiseFileFinalizer(dragFileDownloader));
} else {
// The writer will take care of closing and deletion.
CefThread::PostTask(CefThread::FILE, FROM_HERE,
base::Bind(PromiseWriterHelper, *dropData_,
base::Passed(fileStream.Pass())));
}
// Once we've created the file, we should return the file name.
return SysUTF8ToNSString(filePath.BaseName().value());
return nil;
}
@end // @implementation WebDragSource
@implementation WebDragSource (Private)
- (void)fillPasteboard {
DCHECK(pasteboard_.get());
[pasteboard_ declareTypes:[NSArray array] owner:view_];
// HTML.
if (!dropData_->html.is_null() && !dropData_->html.string().empty())
[pasteboard_ addTypes:[NSArray arrayWithObject:NSHTMLPboardType]
owner:view_];
// URL (and title).
if (dropData_->url.is_valid())
[pasteboard_ addTypes:[NSArray arrayWithObjects:NSURLPboardType,
kNSURLTitlePboardType, nil]
owner:view_];
std::string fileExtension;
// File.
if (!dropData_->file_contents.empty() ||
!dropData_->download_metadata.empty()) {
if (dropData_->download_metadata.empty()) {
fileExtension = GetFileNameFromDragData(*dropData_).Extension();
} else {
string16 mimeType;
base::FilePath fileName;
if (drag_download_util::ParseDownloadMetadata(
dropData_->download_metadata,
&mimeType,
&fileName,
&downloadURL_)) {
download_util::GenerateFileName(
downloadURL_,
std::string(),
std::string(),
UTF16ToUTF8(mimeType),
fileName.value(),
&downloadFileName_);
fileExtension = downloadFileName_.Extension();
}
}
if (!fileExtension.empty()) {
// Strip the leading dot.
fileExtension_ = SysUTF8ToNSString(fileExtension.substr(1));
// File contents (with and without specific type), and file (HFS) promise.
// TODO(viettrungluu): others?
NSArray* types = [NSArray arrayWithObjects:
NSFileContentsPboardType,
NSCreateFileContentsPboardType(fileExtension_),
NSFilesPromisePboardType,
nil];
[pasteboard_ addTypes:types owner:view_];
if (!dropData_->file_contents.empty()) {
[pasteboard_ addTypes:[NSArray arrayWithObject:NSTIFFPboardType]
owner:view_];
}
// For the file promise, we need to specify the extension.
[pasteboard_ setPropertyList:[NSArray arrayWithObject:fileExtension_]
forType:NSFilesPromisePboardType];
}
}
// Plain text.
if (!dropData_->text.is_null() && !dropData_->text.string().empty())
[pasteboard_ addTypes:[NSArray arrayWithObject:NSStringPboardType]
owner:view_];
}
@end // @implementation WebDragSource (Private)
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