зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.9 KiB
C++
132 строки
3.9 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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/* base class for all rule types in a CSS style sheet */
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#ifndef mozilla_css_Rule_h___
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#define mozilla_css_Rule_h___
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#include "mozilla/dom/CSSRuleBinding.h"
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#include "mozilla/dom/DocumentOrShadowRoot.h"
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#include "mozilla/StyleSheet.h"
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#include "mozilla/MemoryReporting.h"
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#include "nsISupports.h"
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#include "nsWrapperCache.h"
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class nsIDocument;
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struct nsRuleData;
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template<class T> struct already_AddRefed;
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class nsHTMLCSSStyleSheet;
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namespace mozilla {
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namespace css {
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class GroupRule;
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class Rule : public nsISupports
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, public nsWrapperCache
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{
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protected:
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Rule(uint32_t aLineNumber, uint32_t aColumnNumber)
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: mSheet(nullptr),
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mParentRule(nullptr),
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mLineNumber(aLineNumber),
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mColumnNumber(aColumnNumber)
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{
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}
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Rule(const Rule& aCopy)
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: mSheet(aCopy.mSheet),
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mParentRule(aCopy.mParentRule),
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mLineNumber(aCopy.mLineNumber),
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mColumnNumber(aCopy.mColumnNumber)
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{
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}
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virtual ~Rule() = default;
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(Rule)
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// Return true if this rule is known to be a cycle collection leaf, in the
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// sense that it doesn't have any outgoing owning edges.
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virtual bool IsCCLeaf() const MOZ_MUST_OVERRIDE;
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0;
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#endif
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StyleSheet* GetStyleSheet() const { return mSheet; }
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// Return the document the rule applies to, if any.
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//
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// Suitable for style updates, and that's about it.
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nsIDocument* GetComposedDoc() const
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{
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return mSheet ? mSheet->GetComposedDoc() : nullptr;
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}
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virtual void SetStyleSheet(StyleSheet* aSheet);
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// We don't reference count this up reference. The rule will tell us
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// when it's going away or when we're detached from it.
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void SetParentRule(Rule* aRule) {
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#ifdef DEBUG
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if (aRule) {
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int16_t type = aRule->Type();
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MOZ_ASSERT(type == dom::CSSRuleBinding::MEDIA_RULE ||
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type == dom::CSSRuleBinding::DOCUMENT_RULE ||
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type == dom::CSSRuleBinding::SUPPORTS_RULE ||
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(type == dom::CSSRuleBinding::KEYFRAMES_RULE &&
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Type() == dom::CSSRuleBinding::KEYFRAME_RULE));
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}
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#endif
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mParentRule = aRule;
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}
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uint32_t GetLineNumber() const { return mLineNumber; }
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uint32_t GetColumnNumber() const { return mColumnNumber; }
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// This is pure virtual because all of Rule's data members are non-owning and
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// thus measured elsewhere.
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virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
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const MOZ_MUST_OVERRIDE = 0;
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// WebIDL interface
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virtual uint16_t Type() const = 0;
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virtual void GetCssText(nsAString& aCssText) const = 0;
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void SetCssText(const nsAString& aCssText);
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Rule* GetParentRule() const;
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StyleSheet* GetParentStyleSheet() const { return GetStyleSheet(); }
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nsINode* GetParentObject() const
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{
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if (!mSheet) {
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return nullptr;
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}
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auto* associated = mSheet->GetAssociatedDocumentOrShadowRoot();
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return associated ? &associated->AsNode() : nullptr;
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}
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protected:
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// True if we're known-live for cycle collection purposes.
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bool IsKnownLive() const;
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// This is sometimes null (e.g., for style attributes).
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StyleSheet* mSheet;
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// When the parent GroupRule is destroyed, it will call SetParentRule(nullptr)
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// on this object. (Through SetParentRuleReference);
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Rule* MOZ_NON_OWNING_REF mParentRule;
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// Keep the same type so that MSVC packs them.
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uint32_t mLineNumber;
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uint32_t mColumnNumber;
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};
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} // namespace css
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} // namespace mozilla
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#endif /* mozilla_css_Rule_h___ */
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