1 // Copyright (c) 2012 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 "ui/base/win/singleton_hwnd.h" 6 7 #include "base/memory/singleton.h" 8 #include "base/message_loop/message_loop.h" 9 10 namespace ui { 11 12 // static 13 SingletonHwnd* SingletonHwnd::GetInstance() { 14 return Singleton<SingletonHwnd>::get(); 15 } 16 17 void SingletonHwnd::AddObserver(Observer* observer) { 18 if (!hwnd()) { 19 if (!base::MessageLoop::current() || 20 base::MessageLoop::current()->type() != base::MessageLoop::TYPE_UI) { 21 // Creating this window in (e.g.) a renderer inhibits shutdown on 22 // Windows. See http://crbug.com/230122 and http://crbug.com/236039. 23 DLOG(ERROR) << "Cannot create windows on non-UI thread!"; 24 return; 25 } 26 WindowImpl::Init(NULL, gfx::Rect()); 27 } 28 observer_list_.AddObserver(observer); 29 } 30 31 void SingletonHwnd::RemoveObserver(Observer* observer) { 32 if (!hwnd()) 33 return; 34 observer_list_.RemoveObserver(observer); 35 } 36 37 BOOL SingletonHwnd::ProcessWindowMessage(HWND window, 38 UINT message, 39 WPARAM wparam, 40 LPARAM lparam, 41 LRESULT& result, 42 DWORD msg_map_id) { 43 FOR_EACH_OBSERVER(Observer, 44 observer_list_, 45 OnWndProc(window, message, wparam, lparam)); 46 return false; 47 } 48 49 SingletonHwnd::SingletonHwnd() { 50 } 51 52 SingletonHwnd::~SingletonHwnd() { 53 } 54 55 } // namespace ui 56
