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