зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
4.4 KiB
C++
140 строки
4.4 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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struct nsRuleData;
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template <class T>
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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, public nsWrapperCache {
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protected:
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Rule(StyleSheet* aSheet, Rule* aParentRule, uint32_t aLineNumber,
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uint32_t aColumnNumber)
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: mSheet(aSheet),
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mParentRule(aParentRule),
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mLineNumber(aLineNumber),
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mColumnNumber(aColumnNumber) {
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#ifdef DEBUG
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// Would be nice to check that this->Type() is KEYFRAME_RULE when
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// mParentRule->Tye() is KEYFRAMES_RULE, but we can't call
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// this->Type() here since it's virtual.
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if (mParentRule) {
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int16_t type = mParentRule->Type();
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MOZ_ASSERT(type == dom::CSSRule_Binding::MEDIA_RULE ||
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type == dom::CSSRule_Binding::DOCUMENT_RULE ||
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type == dom::CSSRule_Binding::SUPPORTS_RULE ||
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type == dom::CSSRule_Binding::KEYFRAMES_RULE);
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}
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#endif
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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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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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dom::Document* GetComposedDoc() const {
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return mSheet ? mSheet->GetComposedDoc() : nullptr;
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}
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// Clear the mSheet pointer on this rule and descendants.
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virtual void DropSheetReference();
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// Clear the mParentRule pointer on this rule.
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void DropParentRuleReference() { mParentRule = nullptr; }
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void DropReferences() {
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DropSheetReference();
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DropParentRuleReference();
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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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// Whether this a rule in a read only style sheet.
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bool IsReadOnly() const;
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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) const
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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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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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// Hook subclasses can use to properly unlink the nsWrapperCache of
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// their declarations.
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void UnlinkDeclarationWrapper(nsWrapperCache& aDecl);
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// mSheet should only ever be null when we create a synthetic CSSFontFaceRule
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// for an InspectorFontFace.
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//
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// mSheet and mParentRule will be cleared when they are detached from the
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// parent object, either because the rule is removed or the parent is
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// destroyed.
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StyleSheet* MOZ_NON_OWNING_REF mSheet;
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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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