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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 #include "base/win/message_window.h" | 5 #include "base/win/message_window.h" |
6 | 6 |
7 #include "base/lazy_instance.h" | |
8 #include "base/logging.h" | 7 #include "base/logging.h" |
9 #include "base/macros.h" | 8 #include "base/macros.h" |
10 #include "base/win/current_module.h" | 9 #include "base/win/current_module.h" |
11 #include "base/win/wrapped_window_proc.h" | 10 #include "base/win/wrapped_window_proc.h" |
12 | 11 |
13 const wchar_t kMessageWindowClassName[] = L"Chrome_MessageWindow"; | 12 const wchar_t kMessageWindowClassName[] = L"Chrome_MessageWindow"; |
14 | 13 |
15 namespace base { | 14 namespace base { |
16 namespace win { | 15 namespace win { |
17 | 16 |
18 // Used along with LazyInstance to register a window class for message-only | 17 // Used along with a threadsafe static pointer to register a window class for |
19 // windows created by MessageWindow. | 18 // message-only windows created by MessageWindow. |
20 class MessageWindow::WindowClass { | 19 class MessageWindow::WindowClass { |
21 public: | 20 public: |
22 WindowClass(); | 21 WindowClass(); |
23 ~WindowClass(); | 22 ~WindowClass(); |
24 | 23 |
25 ATOM atom() { return atom_; } | 24 ATOM atom() { return atom_; } |
26 HINSTANCE instance() { return instance_; } | 25 HINSTANCE instance() { return instance_; } |
27 | 26 |
28 private: | 27 private: |
29 ATOM atom_; | 28 ATOM atom_; |
30 HINSTANCE instance_; | 29 HINSTANCE instance_; |
31 | 30 |
32 DISALLOW_COPY_AND_ASSIGN(WindowClass); | 31 DISALLOW_COPY_AND_ASSIGN(WindowClass); |
33 }; | 32 }; |
34 | 33 |
35 static LazyInstance<MessageWindow::WindowClass> g_window_class = | |
36 LAZY_INSTANCE_INITIALIZER; | |
37 | |
38 MessageWindow::WindowClass::WindowClass() | 34 MessageWindow::WindowClass::WindowClass() |
39 : atom_(0), instance_(CURRENT_MODULE()) { | 35 : atom_(0), instance_(CURRENT_MODULE()) { |
40 WNDCLASSEX window_class; | 36 WNDCLASSEX window_class; |
41 window_class.cbSize = sizeof(window_class); | 37 window_class.cbSize = sizeof(window_class); |
42 window_class.style = 0; | 38 window_class.style = 0; |
43 window_class.lpfnWndProc = &base::win::WrappedWindowProc<WindowProc>; | 39 window_class.lpfnWndProc = &base::win::WrappedWindowProc<WindowProc>; |
44 window_class.cbClsExtra = 0; | 40 window_class.cbClsExtra = 0; |
45 window_class.cbWndExtra = 0; | 41 window_class.cbWndExtra = 0; |
46 window_class.hInstance = instance_; | 42 window_class.hInstance = instance_; |
47 window_class.hIcon = NULL; | 43 window_class.hIcon = NULL; |
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97 } | 93 } |
98 | 94 |
99 bool MessageWindow::DoCreate(const MessageCallback& message_callback, | 95 bool MessageWindow::DoCreate(const MessageCallback& message_callback, |
100 const wchar_t* window_name) { | 96 const wchar_t* window_name) { |
101 DCHECK(CalledOnValidThread()); | 97 DCHECK(CalledOnValidThread()); |
102 DCHECK(message_callback_.is_null()); | 98 DCHECK(message_callback_.is_null()); |
103 DCHECK(!window_); | 99 DCHECK(!window_); |
104 | 100 |
105 message_callback_ = message_callback; | 101 message_callback_ = message_callback; |
106 | 102 |
107 WindowClass& window_class = g_window_class.Get(); | 103 static auto window_class = new WindowClass(); |
108 window_ = CreateWindow(MAKEINTATOM(window_class.atom()), window_name, 0, 0, 0, | 104 window_ = |
109 0, 0, HWND_MESSAGE, 0, window_class.instance(), this); | 105 CreateWindow(MAKEINTATOM(window_class->atom()), window_name, 0, 0, 0, 0, |
| 106 0, HWND_MESSAGE, 0, window_class->instance(), this); |
110 if (!window_) { | 107 if (!window_) { |
111 PLOG(ERROR) << "Failed to create a message-only window"; | 108 PLOG(ERROR) << "Failed to create a message-only window"; |
112 return false; | 109 return false; |
113 } | 110 } |
114 | 111 |
115 return true; | 112 return true; |
116 } | 113 } |
117 | 114 |
118 // static | 115 // static |
119 LRESULT CALLBACK MessageWindow::WindowProc(HWND hwnd, | 116 LRESULT CALLBACK MessageWindow::WindowProc(HWND hwnd, |
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156 LRESULT message_result; | 153 LRESULT message_result; |
157 if (self->message_callback_.Run(message, wparam, lparam, &message_result)) | 154 if (self->message_callback_.Run(message, wparam, lparam, &message_result)) |
158 return message_result; | 155 return message_result; |
159 } | 156 } |
160 | 157 |
161 return DefWindowProc(hwnd, message, wparam, lparam); | 158 return DefWindowProc(hwnd, message, wparam, lparam); |
162 } | 159 } |
163 | 160 |
164 } // namespace win | 161 } // namespace win |
165 } // namespace base | 162 } // namespace base |
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