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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_SCOPED_HANDLE_H__ | 5 #ifndef BASE_SCOPED_HANDLE_H__ |
6 #define BASE_SCOPED_HANDLE_H__ | 6 #define BASE_SCOPED_HANDLE_H__ |
7 | 7 |
8 #include <windows.h> | 8 #include <windows.h> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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126 private: | 126 private: |
127 void Close() { | 127 void Close() { |
128 if (hdc_) | 128 if (hdc_) |
129 DeleteDC(hdc_); | 129 DeleteDC(hdc_); |
130 } | 130 } |
131 | 131 |
132 HDC hdc_; | 132 HDC hdc_; |
133 DISALLOW_EVIL_CONSTRUCTORS(ScopedHDC); | 133 DISALLOW_EVIL_CONSTRUCTORS(ScopedHDC); |
134 }; | 134 }; |
135 | 135 |
136 // Like ScopedHandle but for HBITMAP. | 136 // Like ScopedHandle but for GDI objects. |
137 class ScopedBitmap { | 137 template<class T> |
| 138 class ScopedGDIObject { |
138 public: | 139 public: |
139 ScopedBitmap() : hbitmap_(NULL) { } | 140 ScopedGDIObject() : object_(NULL) {} |
140 explicit ScopedBitmap(HBITMAP h) : hbitmap_(h) { } | 141 explicit ScopedGDIObject(T object) : object_(object) {} |
141 | 142 |
142 ~ScopedBitmap() { | 143 ~ScopedGDIObject() { |
143 Close(); | 144 Close(); |
144 } | 145 } |
145 | 146 |
146 HBITMAP Get() { | 147 T Get() { |
147 return hbitmap_; | 148 return object_; |
148 } | 149 } |
149 | 150 |
150 void Set(HBITMAP h) { | 151 void Set(T object) { |
151 Close(); | 152 if (object_ && object != object_) |
152 hbitmap_ = h; | 153 Close(); |
| 154 object_ = object; |
153 } | 155 } |
154 | 156 |
155 operator HBITMAP() { return hbitmap_; } | 157 ScopedGDIObject& operator=(T object) { |
| 158 Set(object); |
| 159 return *this; |
| 160 } |
| 161 |
| 162 operator T() { return object_; } |
156 | 163 |
157 private: | 164 private: |
158 void Close() { | 165 void Close() { |
159 if (hbitmap_) | 166 if (object_) |
160 DeleteObject(hbitmap_); | 167 DeleteObject(object_); |
161 } | 168 } |
162 | 169 |
163 HBITMAP hbitmap_; | 170 T object_; |
164 DISALLOW_EVIL_CONSTRUCTORS(ScopedBitmap); | 171 DISALLOW_COPY_AND_ASSIGN(ScopedGDIObject); |
165 }; | 172 }; |
166 | 173 |
167 // Like ScopedHandle but for HRGN. | 174 // Typedefs for some common use cases. |
168 class ScopedHRGN { | 175 typedef ScopedGDIObject<HBITMAP> ScopedBitmap; |
169 public: | 176 typedef ScopedGDIObject<HRGN> ScopedHRGN; |
170 explicit ScopedHRGN(HRGN h) : hrgn_(h) { } | 177 typedef ScopedGDIObject<HFONT> ScopedHFONT; |
171 | 178 |
172 ~ScopedHRGN() { | |
173 if (hrgn_) | |
174 DeleteObject(hrgn_); | |
175 } | |
176 | |
177 operator HRGN() { return hrgn_; } | |
178 | |
179 ScopedHRGN& operator=(HRGN hrgn) { | |
180 if (hrgn_ && hrgn != hrgn_) | |
181 DeleteObject(hrgn_); | |
182 hrgn_ = hrgn; | |
183 return *this; | |
184 } | |
185 | |
186 private: | |
187 HRGN hrgn_; | |
188 DISALLOW_EVIL_CONSTRUCTORS(ScopedHRGN); | |
189 }; | |
190 | 179 |
191 // Like ScopedHandle except for HGLOBAL. | 180 // Like ScopedHandle except for HGLOBAL. |
192 template<class T> | 181 template<class T> |
193 class ScopedHGlobal { | 182 class ScopedHGlobal { |
194 public: | 183 public: |
195 explicit ScopedHGlobal(HGLOBAL glob) : glob_(glob) { | 184 explicit ScopedHGlobal(HGLOBAL glob) : glob_(glob) { |
196 data_ = static_cast<T*>(GlobalLock(glob_)); | 185 data_ = static_cast<T*>(GlobalLock(glob_)); |
197 } | 186 } |
198 ~ScopedHGlobal() { | 187 ~ScopedHGlobal() { |
199 GlobalUnlock(glob_); | 188 GlobalUnlock(glob_); |
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211 private: | 200 private: |
212 HGLOBAL glob_; | 201 HGLOBAL glob_; |
213 | 202 |
214 T* data_; | 203 T* data_; |
215 | 204 |
216 DISALLOW_EVIL_CONSTRUCTORS(ScopedHGlobal); | 205 DISALLOW_EVIL_CONSTRUCTORS(ScopedHGlobal); |
217 }; | 206 }; |
218 | 207 |
219 #endif // BASE_SCOPED_HANDLE_H__ | 208 #endif // BASE_SCOPED_HANDLE_H__ |
220 | 209 |
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