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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_
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/aura_export.h"
#include "ui/events/event_handler.h"
#include "ui/events/event_target.h"
#include "ui/gfx/point.h"
namespace ui {
class PlatformEventSource;
}
namespace aura {
namespace test {
class EnvTestHelper;
}
class EnvObserver;
class InputStateLookup;
class Window;
class WindowTreeHost;
// A singleton object that tracks general state within Aura.
class AURA_EXPORT Env : public ui::EventTarget {
public:
Env();
virtual ~Env();
static void CreateInstance();
static Env* GetInstance();
static void DeleteInstance();
void AddObserver(EnvObserver* observer);
void RemoveObserver(EnvObserver* observer);
const int mouse_button_flags() const { return mouse_button_flags_; }
void set_mouse_button_flags(int mouse_button_flags) {
mouse_button_flags_ = mouse_button_flags;
}
// Returns true if a mouse button is down. This may query the native OS,
// otherwise it uses |mouse_button_flags_|.
bool IsMouseButtonDown() const;
// Gets/sets the last mouse location seen in a mouse event in the screen
// coordinates.
const gfx::Point& last_mouse_location() const { return last_mouse_location_; }
void set_last_mouse_location(const gfx::Point& last_mouse_location) {
last_mouse_location_ = last_mouse_location;
}
// Whether any touch device is currently down.
bool is_touch_down() const { return is_touch_down_; }
void set_touch_down(bool value) { is_touch_down_ = value; }
private:
friend class test::EnvTestHelper;
friend class Window;
friend class WindowTreeHost;
void Init();
// Called by the Window when it is initialized. Notifies observers.
void NotifyWindowInitialized(Window* window);
// Called by the WindowTreeHost when it is initialized. Notifies observers.
void NotifyHostInitialized(WindowTreeHost* host);
// Invoked by WindowTreeHost when it is activated. Notifies observers.
void NotifyHostActivated(WindowTreeHost* host);
// Overridden from ui::EventTarget:
virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE;
virtual ui::EventTarget* GetParentTarget() OVERRIDE;
virtual scoped_ptr<ui::EventTargetIterator> GetChildIterator() const OVERRIDE;
virtual ui::EventTargeter* GetEventTargeter() OVERRIDE;
ObserverList<EnvObserver> observers_;
static Env* instance_;
int mouse_button_flags_;
// Location of last mouse event, in screen coordinates.
gfx::Point last_mouse_location_;
bool is_touch_down_;
scoped_ptr<InputStateLookup> input_state_lookup_;
scoped_ptr<ui::PlatformEventSource> event_source_;
DISALLOW_COPY_AND_ASSIGN(Env);
};
} // namespace aura
#endif // UI_AURA_ENV_H_
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