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 #include "ui/gfx/win/singleton_hwnd_observer.h"
  10
  11 namespace gfx {
  12
  13 // static
  14 SingletonHwnd* SingletonHwnd::GetInstance() {
  15   return Singleton<SingletonHwnd>::get();
  16 }
  17
  18 BOOL SingletonHwnd::ProcessWindowMessage(HWND window,
  19                                          UINT message,
  20                                          WPARAM wparam,
  21                                          LPARAM lparam,
  22                                          LRESULT& result,
  23                                          DWORD msg_map_id) {
  24   FOR_EACH_OBSERVER(SingletonHwndObserver,
  25                     observer_list_,
  26                     OnWndProc(window, message, wparam, lparam));
  27   return false;
  28 }
  29
  30 SingletonHwnd::SingletonHwnd() {
  31   if (!base::MessageLoopForUI::IsCurrent()) {
  32     // Creating this window in (e.g.) a renderer inhibits shutdown on
  33     // Windows. See http://crbug.com/230122 and http://crbug.com/236039.
  34     DLOG(ERROR) << "Cannot create windows on non-UI thread!";
  35     return;
  36   }
  37   WindowImpl::Init(NULL, Rect());
  38 }
  39
  40 SingletonHwnd::~SingletonHwnd() {
  41   // WindowImpl will clean up the hwnd value on WM_NCDESTROY.
  42   if (hwnd())
  43     DestroyWindow(hwnd());
  44
  45   // Tell all of our current observers to clean themselves up.
  46   FOR_EACH_OBSERVER(SingletonHwndObserver, observer_list_, ClearWndProc());
  47 }
  48
  49 void SingletonHwnd::AddObserver(SingletonHwndObserver* observer) {
  50   observer_list_.AddObserver(observer);
  51 }
  52
  53 void SingletonHwnd::RemoveObserver(SingletonHwndObserver* observer) {
  54   observer_list_.RemoveObserver(observer);
  55 }
  56
  57 }  // namespace gfx