зеркало из https://github.com/mozilla/gecko-dev.git
146 строки
4.2 KiB
C++
146 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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/StyleSheet.h"
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#include "mozilla/MemoryReporting.h"
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#include "nsISupports.h"
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#include "nsIDOMCSSRule.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 nsIDOMCSSRule
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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() {}
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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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// nsIDOMCSSRule interface
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NS_DECL_NSIDOMCSSRULE
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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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// The constants in this list must maintain the following invariants:
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// If a rule of type N must appear before a rule of type M in stylesheets
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// then N < M
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// Note that CSSStyleSheet::RebuildChildList assumes that no other kinds of
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// rules can come between two rules of type IMPORT_RULE.
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enum {
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UNKNOWN_RULE = 0,
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CHARSET_RULE,
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IMPORT_RULE,
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NAMESPACE_RULE,
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STYLE_RULE,
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MEDIA_RULE,
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FONT_FACE_RULE,
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PAGE_RULE,
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KEYFRAME_RULE,
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KEYFRAMES_RULE,
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DOCUMENT_RULE,
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SUPPORTS_RULE,
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FONT_FEATURE_VALUES_RULE,
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COUNTER_STYLE_RULE
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};
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virtual int32_t GetType() const = 0;
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StyleSheet* GetStyleSheet() const { return mSheet; }
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// Return the document the rule lives in, if any
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nsIDocument* GetDocument() const
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{
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StyleSheet* sheet = GetStyleSheet();
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return sheet ? sheet->GetAssociatedDocument() : nullptr;
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}
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virtual void SetStyleSheet(StyleSheet* aSheet);
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void SetParentRule(GroupRule* aRule) {
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// We don't reference count this up reference. The group rule
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// will tell us when it's going away or when we're detached from
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// it.
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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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/**
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* Clones |this|. Never returns nullptr.
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*/
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virtual already_AddRefed<Rule> Clone() const = 0;
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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, aka helpers for nsIDOMCSSRule implementation.
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virtual uint16_t Type() const = 0;
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virtual void GetCssTextImpl(nsAString& aCssText) const = 0;
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void GetCssText(nsAString& aCssText) const { GetCssTextImpl(aCssText); }
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// XPCOM SetCssText is OK, since it never throws.
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Rule* GetParentRule() const;
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StyleSheet* GetParentStyleSheet() const { return GetStyleSheet(); }
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nsIDocument* GetParentObject() const { return GetDocument(); }
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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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GroupRule* 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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