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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/win/message_window.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/process_util.h" | |
| 9 #include "base/stringprintf.h" | |
| 10 #include "base/utf_string_conversions.h" | |
| 11 #include "base/win/wrapped_window_proc.h" | |
| 12 | |
| 13 const char kClassNameFormat[] = "Chrome_MessageWindow_%p"; | |
| 14 | |
| 15 namespace base { | |
| 16 namespace win { | |
| 17 | |
| 18 MessageWindow::MessageWindow() | |
| 19 : atom_(0), | |
| 20 instance_(NULL), | |
| 21 window_(NULL) { | |
| 22 class_name_ = base::StringPrintf(kClassNameFormat, this); | |
| 23 instance_ = base::GetModuleFromAddress(static_cast<WNDPROC>( | |
| 24 &base::win::WrappedWindowProc<WindowProc>)); | |
| 25 } | |
| 26 | |
| 27 MessageWindow::~MessageWindow() { | |
| 28 DCHECK(CalledOnValidThread()); | |
| 29 | |
| 30 if (window_ != NULL) { | |
| 31 DestroyWindow(window_); | |
| 32 window_ = NULL; | |
| 33 } | |
| 34 | |
| 35 if (atom_ != 0) { | |
| 36 UnregisterClass(MAKEINTATOM(atom_), instance_); | |
| 37 atom_ = 0; | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 bool MessageWindow::Create(Delegate* delegate) { | |
| 42 DCHECK(CalledOnValidThread()); | |
| 43 DCHECK(!atom_); | |
| 44 DCHECK(!window_); | |
| 45 | |
| 46 // Register a separate window class for each instance of |MessageWindow|. | |
| 47 string16 class_name = UTF8ToUTF16(class_name_); | |
| 48 WNDCLASSEX window_class; | |
| 49 window_class.cbSize = sizeof(window_class); | |
| 50 window_class.style = 0; | |
| 51 window_class.lpfnWndProc = &base::win::WrappedWindowProc<WindowProc>; | |
| 52 window_class.cbClsExtra = 0; | |
| 53 window_class.cbWndExtra = 0; | |
| 54 window_class.hInstance = instance_; | |
| 55 window_class.hIcon = NULL; | |
| 56 window_class.hCursor = NULL; | |
| 57 window_class.hbrBackground = NULL; | |
| 58 window_class.lpszMenuName = NULL; | |
| 59 window_class.lpszClassName = class_name.c_str(); | |
| 60 window_class.hIconSm = NULL; | |
| 61 atom_ = RegisterClassEx(&window_class); | |
| 62 if (atom_ == 0) { | |
| 63 LOG_GETLASTERROR(ERROR) | |
| 64 << "Failed to register the window class '" << class_name_ << "'"; | |
| 65 return false; | |
| 66 } | |
| 67 | |
| 68 window_ = CreateWindow(MAKEINTATOM(atom_), 0, 0, 0, 0, 0, 0, HWND_MESSAGE, 0, | |
| 69 instance_, delegate); | |
| 70 if (!window_) { | |
| 71 LOG_GETLASTERROR(ERROR) << "Failed to create a message-only window"; | |
| 72 return false; | |
| 73 } | |
| 74 | |
| 75 return true; | |
| 76 } | |
| 77 | |
| 78 // static | |
| 79 LRESULT CALLBACK MessageWindow::WindowProc(HWND hwnd, | |
| 80 UINT message, | |
| 81 WPARAM wparam, | |
| 82 LPARAM lparam) { | |
| 83 Delegate* delegate = NULL; | |
| 84 | |
| 85 // Set up the delegate before handling WM_CREATE. | |
| 86 if (message == WM_CREATE) { | |
| 87 CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lparam); | |
| 88 delegate = reinterpret_cast<Delegate*>(cs->lpCreateParams); | |
| 89 | |
| 90 // Store pointer to the delegate to the window's user data. | |
| 91 SetLastError(ERROR_SUCCESS); | |
| 92 LONG_PTR result = SetWindowLongPtr( | |
| 93 hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(delegate)); | |
| 94 CHECK(result != 0 || GetLastError() == ERROR_SUCCESS); | |
| 95 } else { | |
| 96 delegate = reinterpret_cast<Delegate*>(GetWindowLongPtr(hwnd, | |
| 97 GWLP_USERDATA)); | |
| 98 } | |
| 99 | |
| 100 // Handle the message. | |
| 101 if (delegate) { | |
| 102 LRESULT message_result; | |
| 103 if (delegate->HandleMessage(hwnd, message, wparam, lparam, &message_result)) | |
| 104 return message_result; | |
| 105 } | |
| 106 | |
| 107 return DefWindowProc(hwnd, message, wparam, lparam); | |
| 108 } | |
| 109 | |
| 110 } // namespace win | |
| 111 } // namespace base | |
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Chromium Code Reviews
Issue 15973003:
Revert 201955 "Allow multiple base::MessagePumpForUI instances t..." (Closed)
Base URL: svn://svn.chromium.org/chrome/