зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.6 KiB
C
73 строки
2.6 KiB
C
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/* -*- 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 "nsXBLBinding.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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// 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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// Returns the binding parent of the subtree to be inserted.
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//
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// This can be null.
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Element* GetBindingParent() const { return mBindingParent; }
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// This constructor should be used for regular appends to content.
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//
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// FIXME(emilio, bug 1555944): nsIContent::GetBindingParent() should return an
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// Element*.
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explicit BindContext(nsINode& aParentNode)
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: mSubtreeRootChanges(true),
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mBindingParent(aParentNode.IsContent()
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? static_cast<Element*>(
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aParentNode.AsContent()->GetBindingParent())
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: nullptr) {}
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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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: mSubtreeRootChanges(false),
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mBindingParent(aShadowRoot.Host()) {}
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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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: mSubtreeRootChanges(true),
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mBindingParent(&aParentElement) {}
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// This is meant to be used to bind XBL anonymous content.
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BindContext(nsXBLBinding& aBinding, Element& aParentElement)
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: mSubtreeRootChanges(true),
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mBindingParent(aBinding.GetBoundElement()) {}
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private:
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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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Element* const mBindingParent;
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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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