/* -*- 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 "PresShell.h"

namespace mozilla {

OneShotPostRefreshObserver::OneShotPostRefreshObserver(PresShell* aPresShell,
                                                       Action&& aAction)
    : mPresShell(aPresShell), mAction(std::move(aAction)) {}

OneShotPostRefreshObserver::OneShotPostRefreshObserver(PresShell* aPresShell)
    : mPresShell(aPresShell) {}

OneShotPostRefreshObserver::~OneShotPostRefreshObserver() = default;

void OneShotPostRefreshObserver::DidRefresh() {
  if (!mPresShell) {
    MOZ_ASSERT_UNREACHABLE(
        "Post-refresh observer fired again after failed attempt at "
        "unregistering it");
    return;
  }

  RefPtr<OneShotPostRefreshObserver> kungfuDeathGrip = this;

  mAction(mPresShell, this);

  nsPresContext* presContext = mPresShell->GetPresContext();
  if (!presContext) {
    MOZ_ASSERT_UNREACHABLE(
        "Unable to unregister post-refresh observer! Leaking it instead of "
        "leaving garbage registered");
    // Graceful handling, just in case...
    mPresShell = nullptr;
    mAction = Action();
    return;
  }
  presContext->UnregisterOneShotPostRefreshObserver(this);
}

}  // namespace mozilla