1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/Rule.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,133 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* base class for all rule types in a CSS style sheet */
1.10 +
1.11 +#ifndef mozilla_css_Rule_h___
1.12 +#define mozilla_css_Rule_h___
1.13 +
1.14 +#include "mozilla/MemoryReporting.h"
1.15 +#include "nsIStyleRule.h"
1.16 +#include "nsIDOMCSSRule.h"
1.17 +#include "nsCSSStyleSheet.h"
1.18 +
1.19 +class nsIStyleSheet;
1.20 +class nsIDocument;
1.21 +struct nsRuleData;
1.22 +template<class T> struct already_AddRefed;
1.23 +class nsHTMLCSSStyleSheet;
1.24 +
1.25 +namespace mozilla {
1.26 +namespace css {
1.27 +class GroupRule;
1.28 +
1.29 +#define DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
1.30 +virtual void MapRuleInfoInto(nsRuleData* aRuleData);
1.31 +
1.32 +#define DECL_STYLE_RULE_INHERIT \
1.33 + DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
1.34 + virtual nsIDOMCSSRule* GetDOMRule(); \
1.35 + virtual nsIDOMCSSRule* GetExistingDOMRule();
1.36 +
1.37 +class Rule : public nsIStyleRule {
1.38 +protected:
1.39 + Rule()
1.40 + : mSheet(0),
1.41 + mParentRule(nullptr)
1.42 + {
1.43 + }
1.44 +
1.45 + Rule(const Rule& aCopy)
1.46 + : mSheet(aCopy.mSheet),
1.47 + mParentRule(aCopy.mParentRule)
1.48 + {
1.49 + }
1.50 +
1.51 + virtual ~Rule() {}
1.52 +
1.53 +public:
1.54 +
1.55 + // The constants in this list must maintain the following invariants:
1.56 + // If a rule of type N must appear before a rule of type M in stylesheets
1.57 + // then N < M
1.58 + // Note that nsCSSStyleSheet::RebuildChildList assumes that no other kinds of
1.59 + // rules can come between two rules of type IMPORT_RULE.
1.60 + enum {
1.61 + UNKNOWN_RULE = 0,
1.62 + CHARSET_RULE,
1.63 + IMPORT_RULE,
1.64 + NAMESPACE_RULE,
1.65 + STYLE_RULE,
1.66 + MEDIA_RULE,
1.67 + FONT_FACE_RULE,
1.68 + PAGE_RULE,
1.69 + KEYFRAME_RULE,
1.70 + KEYFRAMES_RULE,
1.71 + DOCUMENT_RULE,
1.72 + SUPPORTS_RULE,
1.73 + FONT_FEATURE_VALUES_RULE
1.74 + };
1.75 +
1.76 + virtual int32_t GetType() const = 0;
1.77 +
1.78 + nsCSSStyleSheet* GetStyleSheet() const;
1.79 + nsHTMLCSSStyleSheet* GetHTMLCSSStyleSheet() const;
1.80 +
1.81 + // Return the document the rule lives in, if any
1.82 + nsIDocument* GetDocument() const
1.83 + {
1.84 + nsCSSStyleSheet* sheet = GetStyleSheet();
1.85 + return sheet ? sheet->GetDocument() : nullptr;
1.86 + }
1.87 +
1.88 + virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
1.89 + // This does not need to be virtual, because GroupRule and MediaRule are not
1.90 + // used for inline style.
1.91 + void SetHTMLCSSStyleSheet(nsHTMLCSSStyleSheet* aSheet);
1.92 +
1.93 + void SetParentRule(GroupRule* aRule) {
1.94 + // We don't reference count this up reference. The group rule
1.95 + // will tell us when it's going away or when we're detached from
1.96 + // it.
1.97 + mParentRule = aRule;
1.98 + }
1.99 +
1.100 + /**
1.101 + * Clones |this|. Never returns nullptr.
1.102 + */
1.103 + virtual already_AddRefed<Rule> Clone() const = 0;
1.104 +
1.105 + // Note that this returns null for inline style rules since they aren't
1.106 + // supposed to have a DOM rule representation (and our code wouldn't work).
1.107 + virtual nsIDOMCSSRule* GetDOMRule() = 0;
1.108 +
1.109 + // Like GetDOMRule(), but won't create one if we don't have one yet
1.110 + virtual nsIDOMCSSRule* GetExistingDOMRule() = 0;
1.111 +
1.112 + // to implement methods on nsIDOMCSSRule
1.113 + nsresult GetParentRule(nsIDOMCSSRule** aParentRule);
1.114 + nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet);
1.115 +
1.116 + // This is pure virtual because all of Rule's data members are non-owning and
1.117 + // thus measured elsewhere.
1.118 + virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
1.119 + const MOZ_MUST_OVERRIDE = 0;
1.120 +
1.121 + // This is used to measure nsCOMArray<Rule>s.
1.122 + static size_t SizeOfCOMArrayElementIncludingThis(css::Rule* aElement,
1.123 + mozilla::MallocSizeOf aMallocSizeOf,
1.124 + void* aData);
1.125 +
1.126 +protected:
1.127 + // This is either an nsCSSStyleSheet* or a nsHTMLStyleSheet*. The former
1.128 + // if the low bit is 0, the latter if the low bit is 1.
1.129 + uintptr_t mSheet;
1.130 + GroupRule* mParentRule;
1.131 +};
1.132 +
1.133 +} // namespace css
1.134 +} // namespace mozilla
1.135 +
1.136 +#endif /* mozilla_css_Rule_h___ */
