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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsRefreshObservers.h"
#include "nsPresContext.h"
#include "mozilla/Likely.h"
namespace mozilla {
ManagedPostRefreshObserver::ManagedPostRefreshObserver(nsPresContext* aPc,
Action&& aAction)
: mPresContext(aPc), mAction(std::move(aAction)) {}
ManagedPostRefreshObserver::ManagedPostRefreshObserver(nsPresContext* aPc)
: mPresContext(aPc) {
MOZ_ASSERT(mPresContext, "Can't observe without a nsPresContext");
}
ManagedPostRefreshObserver::~ManagedPostRefreshObserver() = default;
void ManagedPostRefreshObserver::Cancel() {
// Caller holds a strong reference, so no need to reference stuff from here.
if (mAction) {
mAction(true);
}
mAction = nullptr;
mPresContext = nullptr;
}
void ManagedPostRefreshObserver::DidRefresh() {
if (MOZ_UNLIKELY(!mAction)) {
return;
}
RefPtr<ManagedPostRefreshObserver> thisObject = this;
auto action = std::move(mAction);
Unregister unregister = action(false);
if (unregister == Unregister::Yes) {
if (RefPtr<nsPresContext> pc = std::move(mPresContext)) {
// We have to null-check mPresContext here because in theory, mAction
// could've ended up in `Cancel` being called, which would clear
// mPresContext. In that case, we're already unregistered so no need to
// do anything.
pc->UnregisterManagedPostRefreshObserver(this);
}
} else {
mAction = std::move(action);
}
}
} // namespace mozilla
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