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// Copyright 2014 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 "third_party/blink/renderer/modules/presentation/presentation_availability.h"
#include "third_party/blink/public/mojom/page/page_visibility_state.mojom-blink.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/frame/use_counter.h"
#include "third_party/blink/renderer/modules/event_target_modules_names.h"
#include "third_party/blink/renderer/modules/presentation/presentation_availability_state.h"
#include "third_party/blink/renderer/modules/presentation/presentation_controller.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
// static
PresentationAvailability* PresentationAvailability::Take(
PresentationAvailabilityProperty* resolver,
const WTF::Vector<KURL>& urls,
bool value) {
PresentationAvailability* presentation_availability =
new PresentationAvailability(resolver->GetExecutionContext(), urls,
value);
presentation_availability->PauseIfNeeded();
presentation_availability->UpdateListening();
return presentation_availability;
}
PresentationAvailability::PresentationAvailability(
ExecutionContext* execution_context,
const WTF::Vector<KURL>& urls,
bool value)
: PausableObject(execution_context),
PageVisibilityObserver(To<Document>(execution_context)->GetPage()),
urls_(urls),
value_(value),
state_(State::kActive) {
DCHECK(execution_context->IsDocument());
}
PresentationAvailability::~PresentationAvailability() = default;
const AtomicString& PresentationAvailability::InterfaceName() const {
return EventTargetNames::PresentationAvailability;
}
ExecutionContext* PresentationAvailability::GetExecutionContext() const {
return PausableObject::GetExecutionContext();
}
void PresentationAvailability::AddedEventListener(
const AtomicString& event_type,
RegisteredEventListener& registered_listener) {
EventTargetWithInlineData::AddedEventListener(event_type,
registered_listener);
if (event_type == EventTypeNames::change) {
UseCounter::Count(GetExecutionContext(),
WebFeature::kPresentationAvailabilityChangeEventListener);
}
}
void PresentationAvailability::AvailabilityChanged(
blink::mojom::ScreenAvailability availability) {
bool value = availability == blink::mojom::ScreenAvailability::AVAILABLE;
if (value_ == value)
return;
value_ = value;
DispatchEvent(*Event::Create(EventTypeNames::change));
}
bool PresentationAvailability::HasPendingActivity() const {
return state_ != State::kInactive;
}
void PresentationAvailability::Unpause() {
SetState(State::kActive);
}
void PresentationAvailability::Pause() {
SetState(State::kSuspended);
}
void PresentationAvailability::ContextDestroyed(ExecutionContext*) {
SetState(State::kInactive);
}
void PresentationAvailability::PageVisibilityChanged() {
if (state_ == State::kInactive)
return;
UpdateListening();
}
void PresentationAvailability::SetState(State state) {
state_ = state;
UpdateListening();
}
void PresentationAvailability::UpdateListening() {
PresentationController* controller =
PresentationController::FromContext(GetExecutionContext());
if (!controller)
return;
if (state_ == State::kActive &&
(To<Document>(GetExecutionContext())->GetPageVisibilityState() ==
mojom::PageVisibilityState::kVisible))
controller->GetAvailabilityState()->AddObserver(this);
else
controller->GetAvailabilityState()->RemoveObserver(this);
}
const Vector<KURL>& PresentationAvailability::Urls() const {
return urls_;
}
bool PresentationAvailability::value() const {
return value_;
}
void PresentationAvailability::Trace(blink::Visitor* visitor) {
EventTargetWithInlineData::Trace(visitor);
PageVisibilityObserver::Trace(visitor);
PausableObject::Trace(visitor);
}
} // namespace blink
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