1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/aura/env.h"
6
7#include "base/command_line.h"
8#include "ui/aura/env_observer.h"
9#include "ui/aura/input_state_lookup.h"
10#include "ui/aura/window.h"
11#include "ui/compositor/compositor.h"
12#include "ui/compositor/compositor_switches.h"
13#include "ui/events/event_target_iterator.h"
14
15#if defined(USE_X11)
16#include "base/message_loop/message_pump_x11.h"
17#endif
18
19namespace aura {
20
21// static
22Env* Env::instance_ = NULL;
23
24////////////////////////////////////////////////////////////////////////////////
25// Env, public:
26
27Env::Env()
28    : mouse_button_flags_(0),
29      is_touch_down_(false),
30      input_state_lookup_(InputStateLookup::Create().Pass()) {
31}
32
33Env::~Env() {
34#if defined(USE_X11)
35  base::MessagePumpX11::Current()->RemoveObserver(
36      &device_list_updater_aurax11_);
37#endif
38
39  FOR_EACH_OBSERVER(EnvObserver, observers_, OnWillDestroyEnv());
40
41  ui::Compositor::Terminate();
42}
43
44//static
45void Env::CreateInstance() {
46  if (!instance_) {
47    instance_ = new Env;
48    instance_->Init();
49  }
50}
51
52// static
53Env* Env::GetInstance() {
54  DCHECK(instance_) << "Env::CreateInstance must be called before getting "
55                       "the instance of Env.";
56  return instance_;
57}
58
59// static
60void Env::DeleteInstance() {
61  delete instance_;
62  instance_ = NULL;
63}
64
65void Env::AddObserver(EnvObserver* observer) {
66  observers_.AddObserver(observer);
67}
68
69void Env::RemoveObserver(EnvObserver* observer) {
70  observers_.RemoveObserver(observer);
71}
72
73bool Env::IsMouseButtonDown() const {
74  return input_state_lookup_.get() ? input_state_lookup_->IsMouseButtonDown() :
75      mouse_button_flags_ != 0;
76}
77
78#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && \
79    !defined(USE_GTK_MESSAGE_PUMP)
80base::MessageLoop::Dispatcher* Env::GetDispatcher() {
81#if defined(USE_X11)
82  return base::MessagePumpX11::Current();
83#else
84  return dispatcher_.get();
85#endif
86}
87#endif
88
89void Env::RootWindowActivated(RootWindow* root_window) {
90  FOR_EACH_OBSERVER(EnvObserver, observers_,
91                    OnRootWindowActivated(root_window));
92}
93
94////////////////////////////////////////////////////////////////////////////////
95// Env, private:
96
97void Env::Init() {
98#if !defined(OS_MACOSX) && !defined(OS_ANDROID) && !defined(USE_X11) && \
99    !defined(USE_OZONE)
100  dispatcher_.reset(CreateDispatcher());
101#endif
102#if defined(USE_X11)
103  // We can't do this with a root window listener because XI_HierarchyChanged
104  // messages don't have a target window.
105  base::MessagePumpX11::Current()->AddObserver(
106      &device_list_updater_aurax11_);
107#endif
108  ui::Compositor::Initialize();
109}
110
111void Env::NotifyWindowInitialized(Window* window) {
112  FOR_EACH_OBSERVER(EnvObserver, observers_, OnWindowInitialized(window));
113}
114
115void Env::NotifyRootWindowInitialized(RootWindow* root_window) {
116  FOR_EACH_OBSERVER(EnvObserver,
117                    observers_,
118                    OnRootWindowInitialized(root_window));
119}
120
121////////////////////////////////////////////////////////////////////////////////
122// Env, ui::EventTarget implementation:
123
124bool Env::CanAcceptEvent(const ui::Event& event) {
125  return true;
126}
127
128ui::EventTarget* Env::GetParentTarget() {
129  return NULL;
130}
131
132scoped_ptr<ui::EventTargetIterator> Env::GetChildIterator() const {
133  return scoped_ptr<ui::EventTargetIterator>();
134}
135
136ui::EventTargeter* Env::GetEventTargeter() {
137  NOTREACHED();
138  return NULL;
139}
140
141}  // namespace aura
142