src/ui/gfx/win/singleton_hwnd.cc

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