cef/libcef/browser_drag_delegate_win.h

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3.9 KiB
C++

// Copyright (c) 2011 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2009 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.
#ifndef _BROWSER_DRAG_DELEGATE_WIN_H
#define _BROWSER_DRAG_DELEGATE_WIN_H
#pragma once
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/platform_thread.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "ui/gfx/point.h"
class BrowserWebViewDelegate;
class DragDropThread;
class WebDragSource;
struct WebDropData;
// Windows-specific drag-and-drop handling.
// If we are dragging a virtual file out of the browser, we use a background
// thread to do the drag-and-drop because we do not want to run nested
// message loop in the UI thread. For all other cases, the drag-and-drop happens
// in the UI thread.
class BrowserDragDelegate
: public ui::DataObjectImpl::Observer,
public base::RefCountedThreadSafe<BrowserDragDelegate> {
public:
explicit BrowserDragDelegate(BrowserWebViewDelegate* view);
virtual ~BrowserDragDelegate();
// Called on UI thread.
void StartDragging(const WebDropData& drop_data,
WebKit::WebDragOperationsMask ops,
const SkBitmap& image,
const gfx::Point& image_offset);
void CancelDrag();
// DataObjectImpl::Observer implementation.
// Called on drag-and-drop thread.
virtual void OnWaitForData();
virtual void OnDataObjectDisposed();
private:
// Called on either UI thread or drag-and-drop thread.
void PrepareDragForDownload(const WebDropData& drop_data,
ui::OSExchangeData* data,
const GURL& page_url,
const std::string& page_encoding);
void PrepareDragForFileContents(const WebDropData& drop_data,
ui::OSExchangeData* data);
void PrepareDragForUrl(const WebDropData& drop_data,
ui::OSExchangeData* data);
void DoDragging(const WebDropData& drop_data,
WebKit::WebDragOperationsMask ops,
const GURL& page_url,
const std::string& page_encoding,
const SkBitmap& image,
const gfx::Point& image_offset);
// Called on drag-and-drop thread.
void StartBackgroundDragging(const WebDropData& drop_data,
WebKit::WebDragOperationsMask ops,
const GURL& page_url,
const std::string& page_encoding,
const SkBitmap& image,
const gfx::Point& image_offset);
// Called on UI thread.
void EndDragging(bool restore_suspended_state);
void CloseThread();
// For debug check only. Access only on drag-and-drop thread.
base::PlatformThreadId drag_drop_thread_id_;
// All the member variables below are accessed on UI thread.
// Keep track of the BrowserWebViewDelegate it is associated with.
BrowserWebViewDelegate* view_;
// |drag_source_| is our callback interface passed to the system when we
// want to initiate a drag and drop operation. We use it to tell if a
// drag operation is happening.
scoped_refptr<WebDragSource> drag_source_;
// The thread used by the drag-out download. This is because we want to avoid
// running nested message loop in main UI thread.
scoped_ptr<DragDropThread> drag_drop_thread_;
// The flag to guard that EndDragging is not called twice.
bool drag_ended_;
// Keep track of the old suspended state of the drop target.
bool old_drop_target_suspended_state_;
DISALLOW_COPY_AND_ASSIGN(BrowserDragDelegate);
};
#endif // _BROWSER_DRAG_DELEGATE_WIN_H