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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/win/singleton_hwnd.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"
namespace gfx {
// static
SingletonHwnd* SingletonHwnd::GetInstance() {
return Singleton<SingletonHwnd>::get();
}
BOOL SingletonHwnd::ProcessWindowMessage(HWND window,
UINT message,
WPARAM wparam,
LPARAM lparam,
LRESULT& result,
DWORD msg_map_id) {
FOR_EACH_OBSERVER(SingletonHwndObserver,
observer_list_,
OnWndProc(window, message, wparam, lparam));
return false;
}
SingletonHwnd::SingletonHwnd() {
if (!base::MessageLoopForUI::IsCurrent()) {
// Creating this window in (e.g.) a renderer inhibits shutdown on
// Windows. See http://crbug.com/230122 and http://crbug.com/236039.
DLOG(ERROR) << "Cannot create windows on non-UI thread!";
return;
}
WindowImpl::Init(NULL, Rect());
}
SingletonHwnd::~SingletonHwnd() {
// WindowImpl will clean up the hwnd value on WM_NCDESTROY.
if (hwnd())
DestroyWindow(hwnd());
// Tell all of our current observers to clean themselves up.
FOR_EACH_OBSERVER(SingletonHwndObserver, observer_list_, ClearWndProc());
}
void SingletonHwnd::AddObserver(SingletonHwndObserver* observer) {
observer_list_.AddObserver(observer);
}
void SingletonHwnd::RemoveObserver(SingletonHwndObserver* observer) {
observer_list_.RemoveObserver(observer);
}
} // namespace gfx
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