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91032e5d60
We added it so the perf team could run some experiments, and they were done but the code was left... Differential Revision: https://phabricator.services.mozilla.com/D67897 --HG-- extra : moz-landing-system : lando
98 lines
3.3 KiB
C++
98 lines
3.3 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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/* State that is passed down to BindToTree. */
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#ifndef mozilla_dom_BindContext_h__
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#define mozilla_dom_BindContext_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/AutoRestore.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/ShadowRoot.h"
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namespace mozilla {
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namespace dom {
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struct MOZ_STACK_CLASS BindContext final {
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struct NestingLevel;
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friend struct NestingLevel;
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// The document that owns the tree we're getting bound to.
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//
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// This is mostly an optimization to avoid silly pointer-chases to get the
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// OwnerDoc().
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Document& OwnerDoc() const { return mDoc; }
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// Whether we're getting connected.
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//
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// https://dom.spec.whatwg.org/#connected
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bool InComposedDoc() const { return mInComposedDoc; }
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// Whether we're getting bound to the document tree.
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//
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// https://dom.spec.whatwg.org/#in-a-document-tree
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bool InUncomposedDoc() const { return mInUncomposedDoc; }
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Document* GetComposedDoc() const { return mInComposedDoc ? &mDoc : nullptr; }
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Document* GetUncomposedDoc() const {
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return mInUncomposedDoc ? &mDoc : nullptr;
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}
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// Whether our subtree root is changing as a result of this operation.
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bool SubtreeRootChanges() const { return mSubtreeRootChanges; }
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// This constructor should be used for regular appends to content.
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explicit BindContext(nsINode& aParent)
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: mDoc(*aParent.OwnerDoc()),
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mInComposedDoc(aParent.IsInComposedDoc()),
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mInUncomposedDoc(aParent.IsInUncomposedDoc()),
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mSubtreeRootChanges(true) {}
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// When re-binding a shadow host into a tree, we re-bind all the shadow tree
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// from the root. In that case, the shadow tree contents remain within the
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// same subtree root. So children should avoid doing silly things like adding
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// themselves to the ShadowRoot's id table twice or what not.
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//
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// This constructor is only meant to be used in that situation.
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explicit BindContext(ShadowRoot& aShadowRoot)
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: mDoc(*aShadowRoot.OwnerDoc()),
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mInComposedDoc(aShadowRoot.IsInComposedDoc()),
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mInUncomposedDoc(false),
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mSubtreeRootChanges(false) {}
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// This constructor is meant to be used when inserting native-anonymous
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// children into a subtree.
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enum ForNativeAnonymous { ForNativeAnonymous };
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BindContext(Element& aParentElement, enum ForNativeAnonymous)
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: mDoc(*aParentElement.OwnerDoc()),
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mInComposedDoc(aParentElement.IsInComposedDoc()),
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mInUncomposedDoc(aParentElement.IsInUncomposedDoc()),
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mSubtreeRootChanges(true) {
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MOZ_ASSERT(mInComposedDoc, "Binding NAC in a disconnected subtree?");
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}
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private:
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static bool IsLikelyUndisplayed(const nsINode& aParent) {
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return aParent.IsAnyOfHTMLElements(nsGkAtoms::style, nsGkAtoms::script);
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}
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Document& mDoc;
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const bool mInComposedDoc;
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const bool mInUncomposedDoc;
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// Whether the bind operation will change the subtree root of the content
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// we're binding.
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const bool mSubtreeRootChanges;
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};
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} // namespace dom
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} // namespace mozilla
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#endif
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