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1 // Copyright (c) 2010 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 BASE_WIN_SCOPED_GDI_OBJECT_H_ | |
6 #define BASE_WIN_SCOPED_GDI_OBJECT_H_ | |
7 | |
8 #include <windows.h> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/logging.h" | |
12 | |
13 namespace base { | |
14 namespace win { | |
15 | |
16 // Like ScopedHandle but for GDI objects. | |
17 template<class T> | |
18 class ScopedGDIObject { | |
19 public: | |
20 ScopedGDIObject() : object_(NULL) {} | |
21 explicit ScopedGDIObject(T object) : object_(object) {} | |
22 | |
23 ~ScopedGDIObject() { | |
24 Close(); | |
25 } | |
26 | |
27 T Get() { | |
28 return object_; | |
29 } | |
30 | |
31 void Set(T object) { | |
32 if (object_ && object != object_) | |
33 Close(); | |
34 object_ = object; | |
35 } | |
36 | |
37 ScopedGDIObject& operator=(T object) { | |
38 Set(object); | |
39 return *this; | |
40 } | |
41 | |
42 T release() { | |
43 T object = object_; | |
44 object_ = NULL; | |
45 return object; | |
46 } | |
47 | |
48 operator T() { return object_; } | |
49 | |
50 private: | |
51 void Close() { | |
52 if (object_) | |
53 DeleteObject(object_); | |
54 } | |
55 | |
56 T object_; | |
57 DISALLOW_COPY_AND_ASSIGN(ScopedGDIObject); | |
58 }; | |
59 | |
60 // An explicit specialization for HICON because we have to call DestroyIcon() | |
61 // instead of DeleteObject() for HICON. | |
62 template<> | |
63 void inline ScopedGDIObject<HICON>::Close() { | |
64 if (object_) | |
65 DestroyIcon(object_); | |
66 } | |
67 | |
68 // Typedefs for some common use cases. | |
69 typedef ScopedGDIObject<HBITMAP> ScopedBitmap; | |
70 typedef ScopedGDIObject<HRGN> ScopedRegion; | |
71 typedef ScopedGDIObject<HFONT> ScopedHFONT; | |
72 typedef ScopedGDIObject<HICON> ScopedHICON; | |
73 | |
74 } // namespace win | |
75 } // namespace base | |
76 | |
77 #endif // BASE_WIN_SCOPED_GDI_OBJECT_H_ | |
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