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
|
// 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_BROWSER_WINDOW_CLIPPING_INFO_H__
#define CHROME_BROWSER_WINDOW_CLIPPING_INFO_H__
#include <windows.h>
#include <atlbase.h>
#include <atlapp.h>
#include <atlmisc.h>
#include "base/basictypes.h"
////////////////////////////////////////////////////////////////////////////////
//
// WindowClippingInfo class
//
// A facility to compute the invisible areas of a window. Given a window,
// this helper class computes all the areas which are obscured or clipped
// by the screen bounds and return them within a single HRGN.
//
////////////////////////////////////////////////////////////////////////////////
class WindowClippingInfo {
public:
//
// Create a new WindowClippingInfo instance to compute clipping info for HWND
// If ignore_wnd is provided, obstruction from that window will be ignored
//
WindowClippingInfo(HWND aWindow, HWND ignore_wnd);
~WindowClippingInfo();
//
// Return a single region containing all the clipped areas
// of the HWND. The region is in HWND coordinate system
//
HRGN GetClippedRegion() const;
//
// Convenience to test whether the window is clipped
//
BOOL IsClipped() const;
private:
// Combine 2 regions
HRGN CombineRegions(HRGN existing, HRGN additional) const;
// Compute the clipping caused by the screen boundaries
void ComputeScreenClipping();
static BOOL CALLBACK WindowEnumProc(HWND hwnd, LPARAM lParam);
// Compute the clipping caused by higher level windows
void ComputeWindowsClipping();
HWND hwnd_;
HWND ignore_;
HRGN rgn_;
CRect hwnd_rect_;
DISALLOW_EVIL_CONSTRUCTORS(WindowClippingInfo);
};
#endif // CHROME_BROWSER_WINDOW_CLIPPING_INFO_H__
|
