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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/message_loop.h"
#include "base/observer_list.h"
#include "ui/aura/aura_export.h"
#include "ui/base/events/event_handler.h"
#include "ui/base/events/event_target.h"
#include "ui/gfx/point.h"
#if defined(USE_X11)
#include "ui/aura/device_list_updater_aurax11.h"
#endif
namespace aura {
class EnvObserver;
class RootWindow;
class Window;
#if !defined(USE_X11)
// 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 ui::EventTarget {
public:
Env();
virtual ~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;
}
// 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; }
// Whether RenderWidgetHostViewAura::OnPaint() should paint white background
// when backing store is not present. Default is true.
// In some cases when page is using transparent background painting white
// background before backing store is initialized causes a white splash.
bool render_white_bg() const { return render_white_bg_; }
void set_render_white_bg(bool value) { render_white_bg_ = value; }
// Returns the native event dispatcher. The result should only be passed to
// base::RunLoop(dispatcher), 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
// Invoked by RootWindow when its host is activated.
void RootWindowActivated(RootWindow* root_window);
private:
friend class Window;
void Init();
// Called by the Window when it is initialized. Notifies observers.
void NotifyWindowInitialized(Window* window);
// Overridden from ui::EventTarget:
virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE;
virtual ui::EventTarget* GetParentTarget() OVERRIDE;
ObserverList<EnvObserver> observers_;
#if !defined(USE_X11)
scoped_ptr<MessageLoop::Dispatcher> dispatcher_;
#endif
static Env* instance_;
int mouse_button_flags_;
// Location of last mouse event, in screen coordinates.
gfx::Point last_mouse_location_;
bool is_touch_down_;
bool render_white_bg_;
#if defined(USE_X11)
DeviceListUpdaterAuraX11 device_list_updater_aurax11_;
#endif
DISALLOW_COPY_AND_ASSIGN(Env);
};
} // namespace aura
#endif // UI_AURA_ENV_H_
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