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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 <memory>
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/supports_user_data.h"
#include "ui/aura/aura_export.h"
#include "ui/events/event_handler.h"
#include "ui/events/event_target.h"
#include "ui/gfx/geometry/point.h"
namespace ui {
class ContextFactory;
class ContextFactoryPrivate;
class PlatformEventSource;
namespace aura {
namespace client {
class FocusClient;
namespace test {
class EnvTestHelper;
class EnvObserver;
class InputStateLookup;
class MusMouseLocationUpdater;
class Window;
class WindowPort;
class WindowTreeClient;
class WindowTreeHost;
// A singleton object that tracks general state within Aura.
class AURA_EXPORT Env : public ui::EventTarget, public base::SupportsUserData {
enum class Mode {
// Classic aura.
// Aura with a backend of mus.
~Env() override;
// NOTE: if you pass in Mode::MUS it is expected that you call
// SetWindowTreeClient() before any windows are created.
static std::unique_ptr<Env> CreateInstance(Mode mode = Mode::LOCAL);
static Env* GetInstance();
static Env* GetInstanceDontCreate();
Mode mode() const { return mode_; }
// Called internally to create the appropriate WindowPort implementation.
std::unique_ptr<WindowPort> CreateWindowPort(Window* window);
void AddObserver(EnvObserver* observer);
void RemoveObserver(EnvObserver* observer);
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;
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; }
void set_context_factory(ui::ContextFactory* context_factory) {
context_factory_ = context_factory;
ui::ContextFactory* context_factory() { return context_factory_; }
void set_context_factory_private(
ui::ContextFactoryPrivate* context_factory_private) {
context_factory_private_ = context_factory_private;
ui::ContextFactoryPrivate* context_factory_private() {
return context_factory_private_;
// See CreateInstance() for description.
void SetWindowTreeClient(WindowTreeClient* window_tree_client);
bool HasWindowTreeClient() const { return window_tree_client_ != nullptr; }
// Sets the active FocusClient and the window the FocusClient is associated
// with. |window| is not necessarily the window that actually has focus.
// |window| may be null, which indicates all windows share a FocusClient.
void SetActiveFocusClient(client::FocusClient* focus_client,
Window* focus_client_root);
client::FocusClient* active_focus_client() { return active_focus_client_; }
Window* active_focus_client_root() { return active_focus_client_root_; }
class ActiveFocusClientWindowObserver;
friend class test::EnvTestHelper;
friend class MusMouseLocationUpdater;
friend class Window;
friend class WindowTreeHost;
explicit Env(Mode mode);
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);
void OnActiveFocusClientWindowDestroying();
// Overridden from ui::EventTarget:
bool CanAcceptEvent(const ui::Event& event) override;
ui::EventTarget* GetParentTarget() override;
std::unique_ptr<ui::EventTargetIterator> GetChildIterator() const override;
ui::EventTargeter* GetEventTargeter() override;
// This is not const for tests, which may share Env across tests and so needs
// to reset the value.
Mode mode_;
WindowTreeClient* window_tree_client_ = nullptr;
base::ObserverList<EnvObserver> observers_;
int mouse_button_flags_;
// Location of last mouse event, in screen coordinates.
mutable gfx::Point last_mouse_location_;
bool is_touch_down_;
bool get_last_mouse_location_from_mus_;
// This may be set to true in tests to force using |last_mouse_location_|
// rather than querying WindowTreeClient.
bool always_use_last_mouse_location_ = false;
std::unique_ptr<InputStateLookup> input_state_lookup_;
std::unique_ptr<ui::PlatformEventSource> event_source_;
ui::ContextFactory* context_factory_;
ui::ContextFactoryPrivate* context_factory_private_;
Window* active_focus_client_root_ = nullptr;
client::FocusClient* active_focus_client_ = nullptr;
} // namespace aura
#endif // UI_AURA_ENV_H_