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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"
#include "ui/aura/client/stacking_client.h"
namespace aura {
class EnvObserver;
class MonitorManager;
class Window;
namespace internal {
class MonitorChangeObserverX11;
}
#if !defined(OS_MACOSX)
// Creates a platform-specific native event dispatcher.
MessageLoop::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);
bool is_mouse_button_down() const { return mouse_button_flags_ != 0; }
void set_mouse_button_flags(int mouse_button_flags) {
mouse_button_flags_ = mouse_button_flags;
}
client::StackingClient* stacking_client() { return stacking_client_; }
void set_stacking_client(client::StackingClient* stacking_client) {
stacking_client_ = stacking_client;
}
// Gets/sets MonitorManager. The MonitorManager's ownership is
// transfered.
MonitorManager* monitor_manager() { return monitor_manager_.get(); }
void SetMonitorManager(MonitorManager* monitor_manager);
// 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;
void Init();
// Called by the Window when it is initialized. Notifies observers.
void NotifyWindowInitialized(Window* window);
ObserverList<EnvObserver> observers_;
#if !defined(OS_MACOSX)
scoped_ptr<MessageLoop::Dispatcher> dispatcher_;
#endif
static Env* instance_;
int mouse_button_flags_;
client::StackingClient* stacking_client_;
scoped_ptr<MonitorManager> monitor_manager_;
#if defined(USE_X11)
scoped_ptr<internal::MonitorChangeObserverX11> monitor_change_observer_;
#endif
DISALLOW_COPY_AND_ASSIGN(Env);
};
} // namespace aura
#endif // UI_AURA_ENV_H_
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