зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.0 KiB
C++
129 строки
4.0 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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/*
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* A unique per-element set of attributes that is used as an
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* nsIStyleRule; used to implement presentational attributes.
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*/
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#ifndef nsMappedAttributes_h___
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#define nsMappedAttributes_h___
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#include "AttrArray.h"
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#include "nsMappedAttributeElement.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ServoBindingTypes.h"
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#include "mozilla/MemoryReporting.h"
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class nsAtom;
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class nsHTMLStyleSheet;
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class nsMappedAttributes final {
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public:
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nsMappedAttributes(nsHTMLStyleSheet* aSheet,
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nsMapRuleToAttributesFunc aMapRuleFunc);
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// Do not return null.
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void* operator new(size_t size, uint32_t aAttrCount = 1) CPP_THROW_NEW;
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nsMappedAttributes* Clone(bool aWillAddAttr);
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NS_INLINE_DECL_REFCOUNTING_WITH_DESTROY(nsMappedAttributes, LastRelease())
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void SetAndSwapAttr(nsAtom* aAttrName, nsAttrValue& aValue,
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bool* aValueWasSet);
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const nsAttrValue* GetAttr(const nsAtom* aAttrName) const;
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const nsAttrValue* GetAttr(const nsAString& aAttrName) const;
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uint32_t Count() const { return mAttrCount; }
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bool Equals(const nsMappedAttributes* aAttributes) const;
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PLDHashNumber HashValue() const;
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void DropStyleSheetReference() { mSheet = nullptr; }
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void SetStyleSheet(nsHTMLStyleSheet* aSheet);
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nsHTMLStyleSheet* GetStyleSheet() { return mSheet; }
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void SetRuleMapper(nsMapRuleToAttributesFunc aRuleMapper) {
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mRuleMapper = aRuleMapper;
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}
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const nsAttrName* NameAt(uint32_t aPos) const {
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NS_ASSERTION(aPos < mAttrCount, "out-of-bounds");
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return &Attrs()[aPos].mName;
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}
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const nsAttrValue* AttrAt(uint32_t aPos) const {
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NS_ASSERTION(aPos < mAttrCount, "out-of-bounds");
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return &Attrs()[aPos].mValue;
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}
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// Remove the attr at position aPos. The value of the attr is placed in
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// aValue; any value that was already in aValue is destroyed.
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void RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue);
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const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const;
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int32_t IndexOfAttr(const nsAtom* aLocalName) const;
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// Apply the contained mapper to the contained set of servo rules,
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// unless the servo rules have already been initialized.
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void LazilyResolveServoDeclaration(mozilla::dom::Document* aDocument);
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// Obtain the contained servo declaration block
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// May return null if called before the inner block
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// has been (lazily) resolved
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const RefPtr<RawServoDeclarationBlock>& GetServoStyle() const {
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return mServoStyle;
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}
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void ClearServoStyle() {
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MOZ_ASSERT(NS_IsMainThread());
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mServoStyle = nullptr;
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}
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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static void Shutdown();
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private:
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void LastRelease();
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nsMappedAttributes(const nsMappedAttributes& aCopy);
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~nsMappedAttributes();
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struct InternalAttr {
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nsAttrName mName;
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nsAttrValue mValue;
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};
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/**
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* Due to a compiler bug in VisualAge C++ for AIX, we need to return the
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* address of the first index into mAttrs here, instead of simply
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* returning mAttrs itself.
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*
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* See Bug 231104 for more information.
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*/
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const InternalAttr* Attrs() const {
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return reinterpret_cast<const InternalAttr*>(&(mAttrs[0]));
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}
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InternalAttr* Attrs() {
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return reinterpret_cast<InternalAttr*>(&(mAttrs[0]));
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}
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uint16_t mAttrCount;
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#ifdef DEBUG
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uint16_t mBufferSize;
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#endif
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nsHTMLStyleSheet* mSheet; // weak
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nsMapRuleToAttributesFunc mRuleMapper;
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RefPtr<RawServoDeclarationBlock> mServoStyle;
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void* mAttrs[1];
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static bool sShuttingDown;
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// We're caching some memory to avoid trashing the allocator.
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// The memory stored at index N can hold N attribute values.
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static nsTArray<void*>* sCachedMappedAttributeAllocations;
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};
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#endif /* nsMappedAttributes_h___ */
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