Home | History | Annotate | Download | only in aura 
      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/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"
     13 
     14 #if defined(USE_OZONE)
     15 #include "ui/ozone/public/ozone_platform.h"
     16 #endif
     17 
     18 namespace aura {
     19 
     20 namespace {
     21 
     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;
     25 
     26 }  // namespace
     27 
     28 ////////////////////////////////////////////////////////////////////////////////
     29 // Env, public:
     30 
     31 // static
     32 void Env::CreateInstance(bool create_event_source) {
     33   if (!lazy_tls_ptr.Pointer()->Get())
     34     (new Env())->Init(create_event_source);
     35 }
     36 
     37 // static
     38 Env* Env::GetInstance() {
     39   Env* env = lazy_tls_ptr.Pointer()->Get();
     40   DCHECK(env) << "Env::CreateInstance must be called before getting the "
     41                  "instance of Env.";
     42   return env;
     43 }
     44 
     45 // static
     46 void Env::DeleteInstance() {
     47   delete lazy_tls_ptr.Pointer()->Get();
     48 }
     49 
     50 void Env::AddObserver(EnvObserver* observer) {
     51   observers_.AddObserver(observer);
     52 }
     53 
     54 void Env::RemoveObserver(EnvObserver* observer) {
     55   observers_.RemoveObserver(observer);
     56 }
     57 
     58 bool Env::IsMouseButtonDown() const {
     59   return input_state_lookup_.get() ? input_state_lookup_->IsMouseButtonDown() :
     60       mouse_button_flags_ != 0;
     61 }
     62 
     63 ////////////////////////////////////////////////////////////////////////////////
     64 // Env, private:
     65 
     66 Env::Env()
     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);
     73 }
     74 
     75 Env::~Env() {
     76   FOR_EACH_OBSERVER(EnvObserver, observers_, OnWillDestroyEnv());
     77   DCHECK_EQ(this, lazy_tls_ptr.Pointer()->Get());
     78   lazy_tls_ptr.Pointer()->Set(NULL);
     79 }
     80 
     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();
     86 #endif
     87   if (create_event_source && !ui::PlatformEventSource::GetInstance())
     88     event_source_ = ui::PlatformEventSource::CreateDefault();
     89 }
     90 
     91 void Env::NotifyWindowInitialized(Window* window) {
     92   FOR_EACH_OBSERVER(EnvObserver, observers_, OnWindowInitialized(window));
     93 }
     94 
     95 void Env::NotifyHostInitialized(WindowTreeHost* host) {
     96   FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostInitialized(host));
     97 }
     98 
     99 void Env::NotifyHostActivated(WindowTreeHost* host) {
    100   FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostActivated(host));
    101 }
    102 
    103 ////////////////////////////////////////////////////////////////////////////////
    104 // Env, ui::EventTarget implementation:
    105 
    106 bool Env::CanAcceptEvent(const ui::Event& event) {
    107   return true;
    108 }
    109 
    110 ui::EventTarget* Env::GetParentTarget() {
    111   return NULL;
    112 }
    113 
    114 scoped_ptr<ui::EventTargetIterator> Env::GetChildIterator() const {
    115   return scoped_ptr<ui::EventTargetIterator>();
    116 }
    117 
    118 ui::EventTargeter* Env::GetEventTargeter() {
    119   NOTREACHED();
    120   return NULL;
    121 }
    122 
    123 }  // namespace aura
    124