зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.2 KiB
C++
105 строки
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef mozilla_ManualNAC_h
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#define mozilla_ManualNAC_h
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#include "mozilla/dom/Element.h"
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#include "mozilla/RefPtr.h"
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namespace mozilla {
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// 16 seems to be the maximum number of manual Native Anonymous Content (NAC)
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// nodes that editor creates for a given element.
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//
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// These need to be manually removed by the machinery that sets the NAC,
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// otherwise we'll leak.
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typedef AutoTArray<RefPtr<dom::Element>, 16> ManualNACArray;
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/**
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* Smart pointer class to own "manual" Native Anonymous Content, and perform
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* the necessary registration and deregistration on the parent element.
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*/
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class ManualNACPtr final {
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public:
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ManualNACPtr() {}
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MOZ_IMPLICIT ManualNACPtr(decltype(nullptr)) {}
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explicit ManualNACPtr(already_AddRefed<Element> aNewNAC) : mPtr(aNewNAC) {
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if (!mPtr) {
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return;
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}
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// Record the NAC on the element, so that AllChildrenIterator can find it.
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nsIContent* parentContent = mPtr->GetParent();
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auto nac = static_cast<ManualNACArray*>(
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parentContent->GetProperty(nsGkAtoms::manualNACProperty));
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if (!nac) {
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nac = new ManualNACArray();
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parentContent->SetProperty(nsGkAtoms::manualNACProperty, nac,
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nsINode::DeleteProperty<ManualNACArray>);
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}
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nac->AppendElement(mPtr);
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}
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// We use move semantics, and delete the copy-constructor and operator=.
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ManualNACPtr(ManualNACPtr&& aOther) : mPtr(aOther.mPtr.forget()) {}
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ManualNACPtr(ManualNACPtr& aOther) = delete;
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ManualNACPtr& operator=(ManualNACPtr&& aOther) {
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mPtr = aOther.mPtr.forget();
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return *this;
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}
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ManualNACPtr& operator=(ManualNACPtr& aOther) = delete;
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~ManualNACPtr() { Reset(); }
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void Reset() {
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if (!mPtr) {
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return;
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}
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RefPtr<Element> ptr = mPtr.forget();
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nsIContent* parentContent = ptr->GetParent();
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if (!parentContent) {
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NS_WARNING("Potentially leaking manual NAC");
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return;
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}
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// Remove reference from the parent element.
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auto nac = static_cast<mozilla::ManualNACArray*>(
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parentContent->GetProperty(nsGkAtoms::manualNACProperty));
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// Document::AdoptNode might remove all properties before destroying editor.
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// So we have to consider that NAC could be already removed.
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if (nac) {
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nac->RemoveElement(ptr);
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if (nac->IsEmpty()) {
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parentContent->DeleteProperty(nsGkAtoms::manualNACProperty);
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}
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}
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ptr->UnbindFromTree();
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}
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Element* get() const { return mPtr.get(); }
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Element* operator->() const { return get(); }
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operator Element*() const& { return get(); }
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private:
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RefPtr<Element> mPtr;
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};
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} // namespace mozilla
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inline void ImplCycleCollectionUnlink(mozilla::ManualNACPtr& field) {
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field.Reset();
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}
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inline void ImplCycleCollectionTraverse(
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nsCycleCollectionTraversalCallback& callback,
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const mozilla::ManualNACPtr& field, const char* name, uint32_t flags = 0) {
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CycleCollectionNoteChild(callback, field.get(), name, flags);
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}
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#endif // #ifndef mozilla_ManualNAC_h
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