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.
5 #include "ui/aura/env.h"
7 #include "base/lazy_instance.h"
8 #include "base/threading/thread_local.h"
9 #include "ui/aura/env_observer.h"
10 #include "ui/aura/input_state_lookup.h"
11 #include "ui/events/event_target_iterator.h"
12 #include "ui/events/platform/platform_event_source.h"
14 #if defined(USE_OZONE)
15 #include "ui/ozone/public/ozone_platform.h"
22 // Env is thread local so that aura may be used on multiple threads.
23 base::LazyInstance<base::ThreadLocalPointer<Env> >::Leaky lazy_tls_ptr =
24 LAZY_INSTANCE_INITIALIZER;
28 ////////////////////////////////////////////////////////////////////////////////
32 void Env::CreateInstance(bool create_event_source) {
33 if (!lazy_tls_ptr.Pointer()->Get())
34 (new Env())->Init(create_event_source);
38 Env* Env::GetInstance() {
39 Env* env = lazy_tls_ptr.Pointer()->Get();
40 DCHECK(env) << "Env::CreateInstance must be called before getting the "
46 void Env::DeleteInstance() {
47 delete lazy_tls_ptr.Pointer()->Get();
50 void Env::AddObserver(EnvObserver* observer) {
51 observers_.AddObserver(observer);
54 void Env::RemoveObserver(EnvObserver* observer) {
55 observers_.RemoveObserver(observer);
58 bool Env::IsMouseButtonDown() const {
59 return input_state_lookup_.get() ? input_state_lookup_->IsMouseButtonDown() :
60 mouse_button_flags_ != 0;
63 ////////////////////////////////////////////////////////////////////////////////
67 : mouse_button_flags_(0),
68 is_touch_down_(false),
69 input_state_lookup_(InputStateLookup::Create().Pass()),
70 context_factory_(NULL) {
71 DCHECK(lazy_tls_ptr.Pointer()->Get() == NULL);
72 lazy_tls_ptr.Pointer()->Set(this);
76 FOR_EACH_OBSERVER(EnvObserver, observers_, OnWillDestroyEnv());
77 DCHECK_EQ(this, lazy_tls_ptr.Pointer()->Get());
78 lazy_tls_ptr.Pointer()->Set(NULL);
81 void Env::Init(bool create_event_source) {
82 #if defined(USE_OZONE)
83 // The ozone platform can provide its own event source. So initialize the
84 // platform before creating the default event source.
85 ui::OzonePlatform::InitializeForUI();
87 if (create_event_source && !ui::PlatformEventSource::GetInstance())
88 event_source_ = ui::PlatformEventSource::CreateDefault();
91 void Env::NotifyWindowInitialized(Window* window) {
92 FOR_EACH_OBSERVER(EnvObserver, observers_, OnWindowInitialized(window));
95 void Env::NotifyHostInitialized(WindowTreeHost* host) {
96 FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostInitialized(host));
99 void Env::NotifyHostActivated(WindowTreeHost* host) {
100 FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostActivated(host));
103 ////////////////////////////////////////////////////////////////////////////////
104 // Env, ui::EventTarget implementation:
106 bool Env::CanAcceptEvent(const ui::Event& event) {
110 ui::EventTarget* Env::GetParentTarget() {
114 scoped_ptr<ui::EventTargetIterator> Env::GetChildIterator() const {
115 return scoped_ptr<ui::EventTargetIterator>();
118 ui::EventTargeter* Env::GetEventTargeter() {