1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
// 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_
#pragma once
#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 "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/point.h"
class DragDropThread;
class WebDragDest;
class WebDragSource;
struct WebDropData;
namespace content {
class WebContents;
}
// 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,
content::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 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.
gfx::NativeWindow source_window_;
content::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_;
// Keep track of the old suspended state of the drop target.
bool old_drop_target_suspended_state_;
base::Callback<void()> drag_end_callback_;
DISALLOW_COPY_AND_ASSIGN(WebContentsDragWin);
};
#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_DRAG_WIN_H_
|
