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