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
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__
#define CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__
#include <atlbase.h>
#include <atlapp.h>
#include <atlmisc.h>
#include "base/base_drop_target.h"
#include "chrome/common/os_exchange_data.h"
namespace ChromeViews {
class RootView;
class View;
// RootViewDropTarget takes care of managing drag and drop for the RootView and
// converts Windows OLE drop messages into Views drop messages.
//
// RootViewDropTarget is responsible for determining the appropriate View to
// use during a drag and drop session, and forwarding events to it.
class RootViewDropTarget : public BaseDropTarget {
public:
explicit RootViewDropTarget(RootView* root_view);
virtual ~RootViewDropTarget();
// If a drag and drop is underway and view is the current drop target, the
// drop target is set to null.
// This is invoked when a View is removed from the RootView to make sure
// we don't target a view that was removed during dnd.
void ResetTargetViewIfEquals(View* view);
protected:
virtual DWORD OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
virtual void OnDragLeave(IDataObject* data_object);
virtual DWORD OnDrop(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
private:
// Calculates the target view for a drop given the specified location in
// the coordinate system of the rootview. This tries to avoid continually
// querying CanDrop by returning target_view_ if the mouse is still over
// target_view_.
View* CalculateTargetView(const CPoint& root_view_location,
const OSExchangeData& data);
// RootView we were created for.
RootView* root_view_;
// View we're targeting events at.
View* target_view_;
// The deepest view under the current drop coordinate.
View* deepest_view_;
DISALLOW_EVIL_CONSTRUCTORS(RootViewDropTarget);
};
} // namespace
#endif // CHROME_VIEWS_ROOT_VIEW_DROP_TARGET_H__
|
