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comparison: layout/style/Rule.h
layout/style/Rule.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* base class for all rule types in a CSS style sheet */ | |
| 7 | |
| 8 #ifndef mozilla_css_Rule_h___ | |
| 9 #define mozilla_css_Rule_h___ | |
| 10 | |
| 11 #include "mozilla/MemoryReporting.h" | |
| 12 #include "nsIStyleRule.h" | |
| 13 #include "nsIDOMCSSRule.h" | |
| 14 #include "nsCSSStyleSheet.h" | |
| 15 | |
| 16 class nsIStyleSheet; | |
| 17 class nsIDocument; | |
| 18 struct nsRuleData; | |
| 19 template<class T> struct already_AddRefed; | |
| 20 class nsHTMLCSSStyleSheet; | |
| 21 | |
| 22 namespace mozilla { | |
| 23 namespace css { | |
| 24 class GroupRule; | |
| 25 | |
| 26 #define DECL_STYLE_RULE_INHERIT_NO_DOMRULE \ | |
| 27 virtual void MapRuleInfoInto(nsRuleData* aRuleData); | |
| 28 | |
| 29 #define DECL_STYLE_RULE_INHERIT \ | |
| 30 DECL_STYLE_RULE_INHERIT_NO_DOMRULE \ | |
| 31 virtual nsIDOMCSSRule* GetDOMRule(); \ | |
| 32 virtual nsIDOMCSSRule* GetExistingDOMRule(); | |
| 33 | |
| 34 class Rule : public nsIStyleRule { | |
| 35 protected: | |
| 36 Rule() | |
| 37 : mSheet(0), | |
| 38 mParentRule(nullptr) | |
| 39 { | |
| 40 } | |
| 41 | |
| 42 Rule(const Rule& aCopy) | |
| 43 : mSheet(aCopy.mSheet), | |
| 44 mParentRule(aCopy.mParentRule) | |
| 45 { | |
| 46 } | |
| 47 | |
| 48 virtual ~Rule() {} | |
| 49 | |
| 50 public: | |
| 51 | |
| 52 // The constants in this list must maintain the following invariants: | |
| 53 // If a rule of type N must appear before a rule of type M in stylesheets | |
| 54 // then N < M | |
| 55 // Note that nsCSSStyleSheet::RebuildChildList assumes that no other kinds of | |
| 56 // rules can come between two rules of type IMPORT_RULE. | |
| 57 enum { | |
| 58 UNKNOWN_RULE = 0, | |
| 59 CHARSET_RULE, | |
| 60 IMPORT_RULE, | |
| 61 NAMESPACE_RULE, | |
| 62 STYLE_RULE, | |
| 63 MEDIA_RULE, | |
| 64 FONT_FACE_RULE, | |
| 65 PAGE_RULE, | |
| 66 KEYFRAME_RULE, | |
| 67 KEYFRAMES_RULE, | |
| 68 DOCUMENT_RULE, | |
| 69 SUPPORTS_RULE, | |
| 70 FONT_FEATURE_VALUES_RULE | |
| 71 }; | |
| 72 | |
| 73 virtual int32_t GetType() const = 0; | |
| 74 | |
| 75 nsCSSStyleSheet* GetStyleSheet() const; | |
| 76 nsHTMLCSSStyleSheet* GetHTMLCSSStyleSheet() const; | |
| 77 | |
| 78 // Return the document the rule lives in, if any | |
| 79 nsIDocument* GetDocument() const | |
| 80 { | |
| 81 nsCSSStyleSheet* sheet = GetStyleSheet(); | |
| 82 return sheet ? sheet->GetDocument() : nullptr; | |
| 83 } | |
| 84 | |
| 85 virtual void SetStyleSheet(nsCSSStyleSheet* aSheet); | |
| 86 // This does not need to be virtual, because GroupRule and MediaRule are not | |
| 87 // used for inline style. | |
| 88 void SetHTMLCSSStyleSheet(nsHTMLCSSStyleSheet* aSheet); | |
| 89 | |
| 90 void SetParentRule(GroupRule* aRule) { | |
| 91 // We don't reference count this up reference. The group rule | |
| 92 // will tell us when it's going away or when we're detached from | |
| 93 // it. | |
| 94 mParentRule = aRule; | |
| 95 } | |
| 96 | |
| 97 /** | |
| 98 * Clones |this|. Never returns nullptr. | |
| 99 */ | |
| 100 virtual already_AddRefed<Rule> Clone() const = 0; | |
| 101 | |
| 102 // Note that this returns null for inline style rules since they aren't | |
| 103 // supposed to have a DOM rule representation (and our code wouldn't work). | |
| 104 virtual nsIDOMCSSRule* GetDOMRule() = 0; | |
| 105 | |
| 106 // Like GetDOMRule(), but won't create one if we don't have one yet | |
| 107 virtual nsIDOMCSSRule* GetExistingDOMRule() = 0; | |
| 108 | |
| 109 // to implement methods on nsIDOMCSSRule | |
| 110 nsresult GetParentRule(nsIDOMCSSRule** aParentRule); | |
| 111 nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet); | |
| 112 | |
| 113 // This is pure virtual because all of Rule's data members are non-owning and | |
| 114 // thus measured elsewhere. | |
| 115 virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) | |
| 116 const MOZ_MUST_OVERRIDE = 0; | |
| 117 | |
| 118 // This is used to measure nsCOMArray<Rule>s. | |
| 119 static size_t SizeOfCOMArrayElementIncludingThis(css::Rule* aElement, | |
| 120 mozilla::MallocSizeOf aMallocSizeOf, | |
| 121 void* aData); | |
| 122 | |
| 123 protected: | |
| 124 // This is either an nsCSSStyleSheet* or a nsHTMLStyleSheet*. The former | |
| 125 // if the low bit is 0, the latter if the low bit is 1. | |
| 126 uintptr_t mSheet; | |
| 127 GroupRule* mParentRule; | |
| 128 }; | |
| 129 | |
| 130 } // namespace css | |
| 131 } // namespace mozilla | |
| 132 | |
| 133 #endif /* mozilla_css_Rule_h___ */ |
