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// Copyright 2012 The Chromium Authors
// 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/task/current_thread.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"
namespace gfx {
// static
SingletonHwnd* SingletonHwnd::GetInstance() {
return base::Singleton<SingletonHwnd>::get();
}
BOOL SingletonHwnd::ProcessWindowMessage(HWND window,
UINT message,
WPARAM wparam,
LPARAM lparam,
LRESULT& result,
DWORD msg_map_id) {
if (!base::CurrentUIThread::IsSet()) {
// If there is no MessageLoop and SingletonHwnd is receiving messages, this
// means it is receiving messages via an external message pump such as COM
// uninitialization.
//
// It is unsafe to forward these messages as observers may depend on the
// existence of a MessageLoop to proceed.
return false;
}
observer_list_.Notify(&SingletonHwndObserver::OnWndProc, window, message,
wparam, lparam);
return false;
}
SingletonHwnd::SingletonHwnd() {
if (!base::CurrentUIThread::IsSet()) {
// Creating this window in (e.g.) a renderer inhibits shutdown on
// Windows. See http://crbug.com/230122 and http://crbug.com/236039.
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.
observer_list_.Notify(&SingletonHwndObserver::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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