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// Copyright 2019 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/wake_lock/wake_lock_sentinel.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/event_target_modules_names.h"
#include "third_party/blink/renderer/modules/wake_lock/wake_lock_manager.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
namespace blink {
WakeLockSentinel::WakeLockSentinel(ScriptState* script_state,
WakeLockType type,
WakeLockManager* manager)
: ExecutionContextLifecycleObserver(ExecutionContext::From(script_state)),
manager_(manager),
type_(type) {}
WakeLockSentinel::~WakeLockSentinel() = default;
ScriptPromise WakeLockSentinel::release(ScriptState* script_state) {
// https://w3c.github.io/wake-lock/#the-release-method
// 1. Let promise be a new promise.
// 2. Run the following steps in parallel:
// 2.1. Run release wake lock with lock set to this object and type set to the
// value of this object's type attribute.
// 2.2. Resolve promise.
// 3. Return promise.
DoRelease();
return ScriptPromise::CastUndefined(script_state);
}
String WakeLockSentinel::type() const {
// https://w3c.github.io/wake-lock/#dom-wakelocksentinel-type
// The type attribute corresponds to the WakeLockSentinel's wake lock type.
switch (type_) {
case WakeLockType::kScreen:
return "screen";
case WakeLockType::kSystem:
return "system";
}
}
ExecutionContext* WakeLockSentinel::GetExecutionContext() const {
return ExecutionContextLifecycleObserver::GetExecutionContext();
}
const AtomicString& WakeLockSentinel::InterfaceName() const {
return event_target_names::kWakeLockSentinel;
}
void WakeLockSentinel::Trace(Visitor* visitor) {
visitor->Trace(manager_);
EventTargetWithInlineData::Trace(visitor);
ExecutionContextLifecycleObserver::Trace(visitor);
}
bool WakeLockSentinel::HasPendingActivity() const {
// This WakeLockSentinel needs to remain alive as long as:
// 1. DoRelease() has not not been called yet AND
// 2. It has at least one event listener.
return manager_ && HasEventListeners();
}
void WakeLockSentinel::ContextDestroyed() {
// Release all event listeners so that HasPendingActivity() does not return
// true forever once a listener has been added to the object.
RemoveAllEventListeners();
DCHECK(!HasEventListeners());
}
void WakeLockSentinel::DoRelease() {
// https://w3c.github.io/wake-lock/#release-wake-lock-algorithm
// 1. Let document be the responsible document of the current settings object.
// 2. Let record be the platform wake lock's state record associated with
// document and type.
// 3. If record.[[ActiveLocks]] does not contain lock, abort these steps.
if (!manager_)
return;
manager_->UnregisterSentinel(this);
manager_.Clear();
// This function may be called on ExecutionContext destruction. Events should
// not be dispatched in this case.
if (!GetExecutionContext() || GetExecutionContext()->IsContextDestroyed())
return;
// 6. Queue a task to fire an event named "release" at lock.
DispatchEvent(*Event::Create(event_type_names::kRelease));
}
} // namespace blink
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