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| 1 // Copyright 2010 Google Inc. | |
| 2 // | |
| 3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
| 4 // you may not use this file except in compliance with the License. | |
| 5 // You may obtain a copy of the License at | |
| 6 // | |
| 7 // http://www.apache.org/licenses/LICENSE-2.0 | |
| 8 // | |
| 9 // Unless required by applicable law or agreed to in writing, software | |
| 10 // distributed under the License is distributed on an "AS IS" BASIS, | |
| 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 12 // See the License for the specific language governing permissions and | |
| 13 // limitations under the License. | |
| 14 // ======================================================================== | |
| 15 | |
| 16 // The scoped_* classes in this file help to make GDI settings easier. The | |
| 17 // constructors of these classes sets/selects provided new value into the | |
| 18 // context (HDC) and stores the original value in a class member. The | |
| 19 // destructors restore the context to its original state by setting the stored | |
| 20 // value back. | |
| 21 // | |
| 22 // Example usage: | |
| 23 // { | |
| 24 // // Selects the font into hdc. | |
| 25 // scoped_select_object select_font(hdc, ::GetStockObject(DEFAULT_GUI_FONT)); | |
| 26 // | |
| 27 // // Changes the bk mode in hdc. | |
| 28 // scoped_set_bk_mode set_bk_mode(hdc, TRANSPARENT); | |
| 29 // | |
| 30 // // Changes the bk color in hdc. | |
| 31 // scoped_set_bk_color set_bk_color(hdc, kBackgroundColor); | |
| 32 // | |
| 33 // /* Do painting operations with hdc here */ | |
| 34 // ... | |
| 35 // | |
| 36 // } // scoped_* goes out of scope, restoring hdc back to its original state. | |
| 37 // | |
| 38 | |
| 39 #ifndef OMAHA_UI_SCOPED_GDI_H_ | |
| 40 #define OMAHA_UI_SCOPED_GDI_H_ | |
| 41 | |
| 42 #include <wingdi.h> | |
| 43 #include "omaha/base/scoped_any.h" | |
| 44 | |
| 45 namespace omaha { | |
| 46 | |
| 47 template<typename C, typename T, class set_policy, class invalid_type> | |
| 48 class scoped_context_set { | |
| 49 public: | |
| 50 scoped_context_set(C context, T new_value) : context_(context) { | |
| 51 original_value_ = set_policy::set(context, new_value); | |
| 52 } | |
| 53 | |
| 54 ~scoped_context_set() { | |
| 55 invalid_type invalid_value; | |
| 56 if (original_value_ != invalid_value) { | |
| 57 set_policy::set(context_, original_value_); | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 private: | |
| 62 T original_value_; | |
| 63 C context_; | |
| 64 }; | |
| 65 | |
| 66 template<typename Fn, Fn Pfn> | |
| 67 class set_function { | |
| 68 public: | |
| 69 template<typename C, typename T> | |
| 70 static T set(C context, T value) { | |
| 71 return Pfn(context, value); | |
| 72 } | |
| 73 }; | |
| 74 | |
| 75 typedef set_function<HGDIOBJ (__stdcall *)(HDC hdc, HGDIOBJ gdiobj), // NOLINT | |
| 76 ::SelectObject> select_object; | |
| 77 typedef set_function<int (__stdcall *)(HDC hdc, int mode), // NOLINT | |
| 78 ::SetBkMode> set_bk_mode; | |
| 79 typedef set_function<COLORREF (__stdcall *)(HDC hdc, COLORREF mode), // NOLINT | |
| 80 ::SetBkColor> set_bk_color; | |
| 81 | |
| 82 typedef value_const<HGDIOBJ, NULL> invalid_gdi_obj_value; | |
| 83 typedef value_const<int, 0> invalid_bk_mode_value; | |
| 84 typedef value_const<COLORREF, CLR_INVALID> invalid_bk_color_value; | |
| 85 | |
| 86 typedef scoped_context_set<HDC, | |
| 87 HGDIOBJ, | |
| 88 select_object, | |
| 89 invalid_gdi_obj_value> ScopedSelectObject; | |
| 90 typedef scoped_context_set<HDC, | |
| 91 int, | |
| 92 set_bk_mode, | |
| 93 invalid_bk_mode_value> ScopedSetBkMode; | |
| 94 typedef scoped_context_set<HDC, | |
| 95 COLORREF, | |
| 96 set_bk_color, | |
| 97 invalid_bk_color_value> ScopedSetBkColor; | |
| 98 | |
| 99 } // namespace omaha | |
| 100 | |
| 101 #endif // OMAHA_UI_SCOPED_GDI_H_ | |
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Chromium Code Reviews
Issue 624713003:
Keep only base/extractor.[cc|h]. (Closed)
Base URL: https://chromium.googlesource.com/external/omaha.git@master