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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 nsContentSupportMap_h__
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#define nsContentSupportMap_h__
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#include "PLDHashTable.h"
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#include "nsTemplateMatch.h"
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/**
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* The nsContentSupportMap maintains a mapping from a "resource element"
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* in the content tree to the nsTemplateMatch that was used to instantiate it. This
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* is necessary to allow the XUL content to be built lazily. Specifically,
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* when building "resumes" on a partially-built content element, the builder
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* will walk upwards in the content tree to find the first element with an
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* 'id' attribute. This element is assumed to be the "resource element",
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* and allows the content builder to access the nsTemplateMatch (variable assignments
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* and rule information).
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*/
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class nsContentSupportMap {
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public:
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nsContentSupportMap() : mMap(PLDHashTable::StubOps(), sizeof(Entry)) { }
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~nsContentSupportMap() { }
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nsresult Put(nsIContent* aElement, nsTemplateMatch* aMatch) {
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PLDHashEntryHdr* hdr = mMap.Add(aElement, mozilla::fallible);
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if (!hdr)
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return NS_ERROR_OUT_OF_MEMORY;
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Entry* entry = static_cast<Entry*>(hdr);
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NS_ASSERTION(entry->mMatch == nullptr, "over-writing entry");
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entry->mContent = aElement;
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entry->mMatch = aMatch;
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return NS_OK;
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}
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bool Get(nsIContent* aElement, nsTemplateMatch** aMatch) {
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PLDHashEntryHdr* hdr = mMap.Search(aElement);
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if (!hdr)
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return false;
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Entry* entry = static_cast<Entry*>(hdr);
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*aMatch = entry->mMatch;
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return true;
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}
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void Remove(nsIContent* aElement);
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void Clear() { mMap.Clear(); }
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protected:
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PLDHashTable mMap;
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struct Entry : public PLDHashEntryHdr {
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nsIContent* mContent;
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nsTemplateMatch* mMatch;
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};
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};
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#endif
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