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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.
#ifndef UI_AURA_ENV_H_
#define UI_AURA_ENV_H_
#pragma once
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "base/observer_list.h"
#include "ui/aura/aura_export.h"
namespace aura {
class EnvObserver;
class Window;
class Dispatcher : public MessageLoop::Dispatcher {
public:
virtual ~Dispatcher() {}
};
#if !defined(OS_MACOSX)
// Creates a platform-specific native event dispatcher.
Dispatcher* CreateDispatcher();
#endif
// A singleton object that tracks general state within Aura.
// TODO(beng): manage RootWindows.
class AURA_EXPORT Env {
public:
Env();
~Env();
static Env* GetInstance();
static void DeleteInstance();
void AddObserver(EnvObserver* observer);
void RemoveObserver(EnvObserver* observer);
// Returns the native event dispatcher. The result should only be passed to
// MessageLoopForUI::RunWithDispatcher() or
// MessageLoopForUI::RunAllPendingWithDispatcher(), or used to dispatch
// an event by |Dispatch(const NativeEvent&)| on it. It must never be stored.
#if !defined(OS_MACOSX)
MessageLoop::Dispatcher* GetDispatcher();
#endif
private:
friend class Window;
// Called by the Window when it is initialized. Notifies observers.
void NotifyWindowInitialized(Window* window);
ObserverList<EnvObserver> observers_;
#if !defined(OS_MACOSX)
scoped_ptr<Dispatcher> dispatcher_;
#endif
static Env* instance_;
DISALLOW_COPY_AND_ASSIGN(Env);
};
} // namespace aura
#endif // UI_AURA_ENV_H_
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