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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.
#include "ui/aura/env.h"
#include "base/lazy_instance.h"
#include "base/threading/thread_local.h"
#include "ui/aura/env_observer.h"
#include "ui/aura/input_state_lookup.h"
#include "ui/events/event_target_iterator.h"
#include "ui/events/platform/platform_event_source.h"
#if defined(USE_OZONE)
#include "ui/ozone/public/ozone_platform.h"
#endif
namespace aura {
namespace {
// Env is thread local so that aura may be used on multiple threads.
base::LazyInstance<base::ThreadLocalPointer<Env> >::Leaky lazy_tls_ptr =
LAZY_INSTANCE_INITIALIZER;
} // namespace
////////////////////////////////////////////////////////////////////////////////
// Env, public:
// static
void Env::CreateInstance(bool create_event_source) {
if (!lazy_tls_ptr.Pointer()->Get())
(new Env())->Init(create_event_source);
}
// static
Env* Env::GetInstance() {
Env* env = lazy_tls_ptr.Pointer()->Get();
DCHECK(env) << "Env::CreateInstance must be called before getting the "
"instance of Env.";
return env;
}
// static
Env* Env::GetInstanceDontCreate() {
return lazy_tls_ptr.Pointer()->Get();
}
// static
void Env::DeleteInstance() {
delete lazy_tls_ptr.Pointer()->Get();
}
void Env::AddObserver(EnvObserver* observer) {
observers_.AddObserver(observer);
}
void Env::RemoveObserver(EnvObserver* observer) {
observers_.RemoveObserver(observer);
}
bool Env::IsMouseButtonDown() const {
return input_state_lookup_.get() ? input_state_lookup_->IsMouseButtonDown() :
mouse_button_flags_ != 0;
}
////////////////////////////////////////////////////////////////////////////////
// Env, private:
Env::Env()
: mouse_button_flags_(0),
is_touch_down_(false),
input_state_lookup_(InputStateLookup::Create()),
context_factory_(NULL) {
DCHECK(lazy_tls_ptr.Pointer()->Get() == NULL);
lazy_tls_ptr.Pointer()->Set(this);
}
Env::~Env() {
FOR_EACH_OBSERVER(EnvObserver, observers_, OnWillDestroyEnv());
DCHECK_EQ(this, lazy_tls_ptr.Pointer()->Get());
lazy_tls_ptr.Pointer()->Set(NULL);
}
void Env::Init(bool create_event_source) {
if (!create_event_source)
return;
#if defined(USE_OZONE)
// The ozone platform can provide its own event source. So initialize the
// platform before creating the default event source.
ui::OzonePlatform::InitializeForUI();
#endif
if (!ui::PlatformEventSource::GetInstance())
event_source_ = ui::PlatformEventSource::CreateDefault();
}
void Env::NotifyWindowInitialized(Window* window) {
FOR_EACH_OBSERVER(EnvObserver, observers_, OnWindowInitialized(window));
}
void Env::NotifyHostInitialized(WindowTreeHost* host) {
FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostInitialized(host));
}
void Env::NotifyHostActivated(WindowTreeHost* host) {
FOR_EACH_OBSERVER(EnvObserver, observers_, OnHostActivated(host));
}
////////////////////////////////////////////////////////////////////////////////
// Env, ui::EventTarget implementation:
bool Env::CanAcceptEvent(const ui::Event& event) {
return true;
}
ui::EventTarget* Env::GetParentTarget() {
return NULL;
}
scoped_ptr<ui::EventTargetIterator> Env::GetChildIterator() const {
return nullptr;
}
ui::EventTargeter* Env::GetEventTargeter() {
NOTREACHED();
return NULL;
}
} // namespace aura
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