зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
3.9 KiB
C++
134 строки
3.9 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/MemoryReporting.h"
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#include "nsIStyleRule.h"
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#include "nsIDOMCSSRule.h"
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#include "nsCSSStyleSheet.h"
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class nsIStyleSheet;
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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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#define DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
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virtual void MapRuleInfoInto(nsRuleData* aRuleData);
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#define DECL_STYLE_RULE_INHERIT \
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DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
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virtual nsIDOMCSSRule* GetDOMRule(); \
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virtual nsIDOMCSSRule* GetExistingDOMRule();
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class Rule : public nsIStyleRule {
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protected:
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Rule()
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: mSheet(0),
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mParentRule(nullptr)
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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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{
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}
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virtual ~Rule() {}
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public:
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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 nsCSSStyleSheet::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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};
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virtual int32_t GetType() const = 0;
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nsCSSStyleSheet* GetStyleSheet() const;
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nsHTMLCSSStyleSheet* GetHTMLCSSStyleSheet() const;
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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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nsCSSStyleSheet* sheet = GetStyleSheet();
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return sheet ? sheet->GetDocument() : nullptr;
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}
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virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
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// This does not need to be virtual, because GroupRule and MediaRule are not
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// used for inline style.
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void SetHTMLCSSStyleSheet(nsHTMLCSSStyleSheet* 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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/**
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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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// Note that this returns null for inline style rules since they aren't
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// supposed to have a DOM rule representation (and our code wouldn't work).
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virtual nsIDOMCSSRule* GetDOMRule() = 0;
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// Like GetDOMRule(), but won't create one if we don't have one yet
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virtual nsIDOMCSSRule* GetExistingDOMRule() = 0;
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// to implement methods on nsIDOMCSSRule
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nsresult GetParentRule(nsIDOMCSSRule** aParentRule);
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nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet);
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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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// This is used to measure nsCOMArray<Rule>s.
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static size_t SizeOfCOMArrayElementIncludingThis(css::Rule* aElement,
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mozilla::MallocSizeOf aMallocSizeOf,
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void* aData);
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protected:
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// This is either an nsCSSStyleSheet* or a nsHTMLStyleSheet*. The former
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// if the low bit is 0, the latter if the low bit is 1.
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uintptr_t mSheet;
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GroupRule* mParentRule;
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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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