1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
6#define CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
7#pragma once
8
9#include "base/memory/scoped_ptr.h"
10#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
11#include "ui/base/dragdrop/drop_target.h"
12
13class InterstitialDropTarget;
14class RenderViewHost;
15class TabContents;
16
17// A helper object that provides drop capabilities to a TabContents. The
18// DropTarget handles drags that enter the region of the TabContents by
19// passing on the events to the renderer.
20class WebDropTarget : public ui::DropTarget {
21 public:
22  // Create a new WebDropTarget associating it with the given HWND and
23  // TabContents.
24  WebDropTarget(HWND source_hwnd, TabContents* contents);
25  virtual ~WebDropTarget();
26
27  void set_drag_cursor(WebKit::WebDragOperation op) {
28    drag_cursor_ = op;
29  }
30
31 protected:
32  virtual DWORD OnDragEnter(IDataObject* data_object,
33                            DWORD key_state,
34                            POINT cursor_position,
35                            DWORD effect);
36
37  virtual DWORD OnDragOver(IDataObject* data_object,
38                           DWORD key_state,
39                           POINT cursor_position,
40                           DWORD effect);
41
42  virtual void OnDragLeave(IDataObject* data_object);
43
44  virtual DWORD OnDrop(IDataObject* data_object,
45                       DWORD key_state,
46                       POINT cursor_position,
47                       DWORD effect);
48
49 private:
50  // Our associated TabContents.
51  TabContents* tab_contents_;
52
53  // We keep track of the render view host we're dragging over.  If it changes
54  // during a drag, we need to re-send the DragEnter message.  WARNING:
55  // this pointer should never be dereferenced.  We only use it for comparing
56  // pointers.
57  RenderViewHost* current_rvh_;
58
59  // Used to determine what cursor we should display when dragging over web
60  // content area.  This can be updated async during a drag operation.
61  WebKit::WebDragOperation drag_cursor_;
62
63  // A special drop target handler for when we try to d&d while an interstitial
64  // page is showing.
65  scoped_ptr<InterstitialDropTarget> interstitial_drop_target_;
66
67  DISALLOW_COPY_AND_ASSIGN(WebDropTarget);
68};
69
70#endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_
71