cef/cef1/libcef/browser_drag_delegate_win.cc

362 lines
13 KiB
C++

// 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 "libcef/browser_drag_delegate_win.h"
#include <windows.h>
#include <string>
#include "libcef/browser_impl.h"
#include "libcef/browser_webview_delegate.h"
#include "libcef/cef_thread.h"
#include "libcef/drag_download_file.h"
#include "libcef/drag_download_util.h"
#include "libcef/download_util.h"
#include "libcef/web_drag_source_win.h"
#include "libcef/web_drag_utils_win.h"
#include "libcef/web_drop_target_win.h"
#include "base/bind.h"
#include "base/utf_string_conversions.h"
#include "net/base/file_stream.h"
#include "net/base/net_util.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 "ui/base/dragdrop/drag_utils.h"
#include "webkit/glue/webdropdata.h"
using WebKit::WebDragOperationsMask;
using WebKit::WebDragOperationCopy;
using WebKit::WebDragOperationLink;
using WebKit::WebDragOperationMove;
using WebKit::WebView;
namespace {
HHOOK msg_hook = NULL;
DWORD drag_out_thread_id = 0;
bool mouse_up_received = false;
LRESULT CALLBACK MsgFilterProc(int code, WPARAM wparam, LPARAM lparam) {
if (code == base::MessagePumpForUI::kMessageFilterCode &&
!mouse_up_received) {
MSG* msg = reinterpret_cast<MSG*>(lparam);
// We do not care about WM_SYSKEYDOWN and WM_SYSKEYUP because when ALT key
// is pressed down on drag-and-drop, it means to create a link.
if (msg->message == WM_MOUSEMOVE || msg->message == WM_LBUTTONUP ||
msg->message == WM_KEYDOWN || msg->message == WM_KEYUP) {
// Forward the message from the UI thread to the drag-and-drop thread.
PostThreadMessage(drag_out_thread_id,
msg->message,
msg->wParam,
msg->lParam);
// If the left button is up, we do not need to forward the message any
// more.
if (msg->message == WM_LBUTTONUP || !(GetKeyState(VK_LBUTTON) & 0x8000))
mouse_up_received = true;
return TRUE;
}
}
return CallNextHookEx(msg_hook, code, wparam, lparam);
}
} // namespace
class DragDropThread : public base::Thread {
public:
explicit DragDropThread(BrowserDragDelegate* drag_handler)
: base::Thread("Chrome_DragDropThread"),
drag_handler_(drag_handler) {
}
virtual ~DragDropThread() {
Thread::Stop();
}
protected:
// base::Thread implementations:
virtual void Init() {
int ole_result = OleInitialize(NULL);
DCHECK(ole_result == S_OK);
}
virtual void CleanUp() {
OleUninitialize();
}
private:
// Hold a reference count to BrowserDragDelegate to make sure that it is
// always alive in the thread lifetime.
scoped_refptr<BrowserDragDelegate> drag_handler_;
DISALLOW_COPY_AND_ASSIGN(DragDropThread);
};
BrowserDragDelegate::BrowserDragDelegate(BrowserWebViewDelegate* view)
: drag_drop_thread_id_(0),
view_(view),
drag_ended_(false),
old_drop_target_suspended_state_(false) {
}
BrowserDragDelegate::~BrowserDragDelegate() {
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
DCHECK(!drag_drop_thread_.get());
}
void BrowserDragDelegate::StartDragging(const WebDropData& drop_data,
WebDragOperationsMask ops,
const SkBitmap& image,
const gfx::Point& image_offset) {
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
CefBrowserImpl* browser = view_->GetBrowser();
WebView* web_view = browser->UIT_GetWebView();
drag_source_ = new WebDragSource(browser->UIT_GetWebViewWndHandle(),
web_view);
const GURL& page_url = web_view->mainFrame()->document().url();
const std::string& page_encoding =
web_view->mainFrame()->document().encoding().utf8();
// If it is not drag-out, do the drag-and-drop in the current UI thread.
if (drop_data.download_metadata.empty()) {
DoDragging(drop_data, ops, page_url, page_encoding, image, image_offset);
CefThread::PostTask(
CefThread::UI, FROM_HERE,
base::Bind(&BrowserDragDelegate::EndDragging, this, false));
return;
}
// We do not want to drag and drop the download to itself.
old_drop_target_suspended_state_ = view_->drop_target()->suspended();
view_->drop_target()->set_suspended(true);
// Start a background thread to do the drag-and-drop.
DCHECK(!drag_drop_thread_.get());
drag_drop_thread_.reset(new DragDropThread(this));
base::Thread::Options options;
options.message_loop_type = MessageLoop::TYPE_UI;
if (drag_drop_thread_->StartWithOptions(options)) {
drag_drop_thread_->message_loop()->PostTask(
FROM_HERE,
base::Bind(&BrowserDragDelegate::StartBackgroundDragging,
this,
drop_data,
ops,
page_url,
page_encoding,
image,
image_offset));
}
// Install a hook procedure to monitor the messages so that we can forward
// the appropriate ones to the background thread.
drag_out_thread_id = drag_drop_thread_->thread_id();
mouse_up_received = false;
DCHECK(!msg_hook);
msg_hook = SetWindowsHookEx(WH_MSGFILTER,
MsgFilterProc,
NULL,
GetCurrentThreadId());
// Attach the input state of the background thread to the UI thread so that
// SetCursor can work from the background thread.
AttachThreadInput(drag_out_thread_id, GetCurrentThreadId(), TRUE);
}
void BrowserDragDelegate::StartBackgroundDragging(
const WebDropData& drop_data,
WebDragOperationsMask ops,
const GURL& page_url,
const std::string& page_encoding,
const SkBitmap& image,
const gfx::Point& image_offset) {
drag_drop_thread_id_ = base::PlatformThread::CurrentId();
DoDragging(drop_data, ops, page_url, page_encoding, image, image_offset);
CefThread::PostTask(
CefThread::UI, FROM_HERE,
base::Bind(&BrowserDragDelegate::EndDragging, this, true));
}
void BrowserDragDelegate::PrepareDragForDownload(
const WebDropData& drop_data,
ui::OSExchangeData* data,
const GURL& page_url,
const std::string& page_encoding) {
// Parse the download metadata.
string16 mime_type;
FilePath file_name;
GURL download_url;
if (!drag_download_util::ParseDownloadMetadata(drop_data.download_metadata,
&mime_type,
&file_name,
&download_url))
return;
// Generate the download filename.
std::string content_disposition =
"attachment; filename=" + UTF16ToUTF8(file_name.value());
FilePath generated_file_name;
download_util::GenerateFileName(download_url,
content_disposition,
std::string(),
UTF16ToUTF8(mime_type),
std::string(),
&generated_file_name);
// Provide the data as file (CF_HDROP). A temporary download file with the
// Zone.Identifier ADS (Alternate Data Stream) attached will be created.
linked_ptr<net::FileStream> empty_file_stream;
scoped_refptr<DragDownloadFile> download_file =
new DragDownloadFile(generated_file_name,
empty_file_stream,
download_url,
page_url,
page_encoding,
view_);
ui::OSExchangeData::DownloadFileInfo file_download(FilePath(),
download_file.get());
data->SetDownloadFileInfo(file_download);
// Enable asynchronous operation.
ui::OSExchangeDataProviderWin::GetIAsyncOperation(*data)->SetAsyncMode(TRUE);
}
void BrowserDragDelegate::PrepareDragForFileContents(
const WebDropData& drop_data, ui::OSExchangeData* data) {
static const int kMaxFilenameLength = 255; // FAT and NTFS
FilePath file_name(drop_data.file_description_filename);
string16 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.value().empty()) {
// Retrieve the name from the URL.
file_name = FilePath(
net::GetSuggestedFilename(drop_data.url, "", "", "", "", ""));
if (file_name.value().size() + extension.size() > kMaxFilenameLength) {
file_name = FilePath(file_name.value().substr(
0, kMaxFilenameLength - extension.size()));
}
}
file_name = file_name.ReplaceExtension(extension);
data->SetFileContents(file_name, drop_data.file_contents);
}
void BrowserDragDelegate::PrepareDragForUrl(const WebDropData& drop_data,
ui::OSExchangeData* data) {
if (drop_data.url.SchemeIs("javascript")) {
// We don't want to allow javascript URLs to be dragged to the desktop.
} else {
data->SetURL(drop_data.url, drop_data.url_title);
}
}
void BrowserDragDelegate::DoDragging(const WebDropData& drop_data,
WebDragOperationsMask ops,
const GURL& page_url,
const std::string& page_encoding,
const SkBitmap& image,
const gfx::Point& image_offset) {
ui::OSExchangeData data;
if (!drop_data.download_metadata.empty()) {
PrepareDragForDownload(drop_data, &data, page_url, page_encoding);
// Set the observer.
ui::OSExchangeDataProviderWin::GetDataObjectImpl(data)->set_observer(this);
} else {
// We set the file contents before the URL because the URL also sets file
// contents (to a .URL shortcut). We want to prefer file content data over
// a shortcut so we add it first.
if (!drop_data.file_contents.empty())
PrepareDragForFileContents(drop_data, &data);
if (!drop_data.text_html.empty())
data.SetHtml(drop_data.text_html, drop_data.html_base_url);
// We set the text contents before the URL because the URL also sets text
// content.
if (!drop_data.plain_text.empty())
data.SetString(drop_data.plain_text);
if (drop_data.url.is_valid())
PrepareDragForUrl(drop_data, &data);
}
// Set drag image.
if (!image.isNull()) {
drag_utils::SetDragImageOnDataObject(
image, gfx::Size(image.width(), image.height()), image_offset, &data);
}
// We need to enable recursive tasks on the message loop so we can get
// updates while in the system DoDragDrop loop.
bool old_state = MessageLoop::current()->NestableTasksAllowed();
MessageLoop::current()->SetNestableTasksAllowed(true);
DWORD effect;
DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data), drag_source_,
web_drag_utils_win::WebDragOpMaskToWinDragOpMask(ops), &effect);
MessageLoop::current()->SetNestableTasksAllowed(old_state);
// This works because WebDragSource::OnDragSourceDrop uses PostTask to
// dispatch the actual event.
drag_source_->set_effect(effect);
}
void BrowserDragDelegate::EndDragging(bool restore_suspended_state) {
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
if (drag_ended_)
return;
drag_ended_ = true;
if (restore_suspended_state)
view_->drop_target()->set_suspended(old_drop_target_suspended_state_);
if (msg_hook) {
AttachThreadInput(drag_out_thread_id, GetCurrentThreadId(), FALSE);
UnhookWindowsHookEx(msg_hook);
msg_hook = NULL;
}
view_->EndDragging();
}
void BrowserDragDelegate::CancelDrag() {
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
drag_source_->CancelDrag();
}
void BrowserDragDelegate::CloseThread() {
DCHECK(CefThread::CurrentlyOn(CefThread::UI));
drag_drop_thread_.reset();
}
void BrowserDragDelegate::OnWaitForData() {
DCHECK(drag_drop_thread_id_ == base::PlatformThread::CurrentId());
// When the left button is released and we start to wait for the data, end
// the dragging before DoDragDrop returns. This makes the page leave the drag
// mode so that it can start to process the normal input events.
CefThread::PostTask(
CefThread::UI, FROM_HERE,
base::Bind(&BrowserDragDelegate::EndDragging, this, true));
}
void BrowserDragDelegate::OnDataObjectDisposed() {
DCHECK(drag_drop_thread_id_ == base::PlatformThread::CurrentId());
// The drag-and-drop thread is only closed after OLE is done with
// DataObjectImpl.
CefThread::PostTask(
CefThread::UI, FROM_HERE,
base::Bind(&BrowserDragDelegate::CloseThread, this));
}