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// Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_DRAG_WIN_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_DRAG_WIN_H_
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/platform_thread.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/point.h"
class SkBitmap;
struct WebDropData;
namespace gfx {
class ImageSkia;
}
namespace content {
class DragDropThread;
class WebContents;
class WebDragDest;
class WebDragSource;
// Windows-specific drag-and-drop handling in WebContentsView.
// 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 CONTENT_EXPORT WebContentsDragWin
: NON_EXPORTED_BASE(public ui::DataObjectImpl::Observer),
public base::RefCountedThreadSafe<WebContentsDragWin> {
public:
WebContentsDragWin(gfx::NativeWindow source_window,
WebContents* web_contents,
WebDragDest* drag_dest,
const base::Callback<void()>& drag_end_callback);
virtual ~WebContentsDragWin();
// Called on UI thread.
void StartDragging(const WebDropData& drop_data,
WebKit::WebDragOperationsMask ops,
const gfx::ImageSkia& image,
const gfx::Vector2d& 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);
// Returns false if the source window becomes invalid when the drag ends.
// This could happen when the window gets destroyed when the drag is still in
// progress. No further processing should be done beyond this return point
// because the instance has been destroyed.
bool DoDragging(const WebDropData& drop_data,
WebKit::WebDragOperationsMask ops,
const GURL& page_url,
const std::string& page_encoding,
const gfx::ImageSkia& image,
const gfx::Vector2d& 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 gfx::ImageSkia& image,
const gfx::Vector2d& image_offset);
// Called on UI thread.
void EndDragging();
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.
gfx::NativeWindow source_window_;
WebContents* web_contents_;
WebDragDest* drag_dest_;
// |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_;
base::Callback<void()> drag_end_callback_;
DISALLOW_COPY_AND_ASSIGN(WebContentsDragWin);
};
} // namespace content
#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_DRAG_WIN_H_
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