The Tor Browser: layout/style/Rule.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/. */

     6 /* base class for all rule types in a CSS style sheet */

     8 #ifndef mozilla_css_Rule_h___

     9 #define mozilla_css_Rule_h___

    11 #include "mozilla/MemoryReporting.h"

    12 #include "nsIStyleRule.h"

    13 #include "nsIDOMCSSRule.h"

    14 #include "nsCSSStyleSheet.h"

    16 class nsIStyleSheet;

    17 class nsIDocument;

    18 struct nsRuleData;

    19 template<class T> struct already_AddRefed;

    20 class nsHTMLCSSStyleSheet;

    22 namespace mozilla {

    23 namespace css {

    24 class GroupRule;

    26 #define DECL_STYLE_RULE_INHERIT_NO_DOMRULE  \

    27 virtual void MapRuleInfoInto(nsRuleData* aRuleData);

    29 #define DECL_STYLE_RULE_INHERIT                   \

    30   DECL_STYLE_RULE_INHERIT_NO_DOMRULE              \

    31   virtual nsIDOMCSSRule* GetDOMRule();            \

    32   virtual nsIDOMCSSRule* GetExistingDOMRule();

    34 class Rule : public nsIStyleRule {

    35 protected:

    36   Rule()

    37     : mSheet(0),

    38       mParentRule(nullptr)

    39   {

    40   }

    42   Rule(const Rule& aCopy)

    43     : mSheet(aCopy.mSheet),

    44       mParentRule(aCopy.mParentRule)

    45   {

    46   }

    48   virtual ~Rule() {}

    50 public:

    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   };

    73   virtual int32_t GetType() const = 0;

    75   nsCSSStyleSheet* GetStyleSheet() const;

    76   nsHTMLCSSStyleSheet* GetHTMLCSSStyleSheet() const;

    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   }

    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);

    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   }

    97   /**

    98    * Clones |this|. Never returns nullptr.

    99    */

   100   virtual already_AddRefed<Rule> Clone() const = 0;

   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;

   106   // Like GetDOMRule(), but won't create one if we don't have one yet

   107   virtual nsIDOMCSSRule* GetExistingDOMRule() = 0;

   109   // to implement methods on nsIDOMCSSRule

   110   nsresult GetParentRule(nsIDOMCSSRule** aParentRule);

   111   nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet);

   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;

   118   // This is used to measure nsCOMArray<Rule>s.

   119   static size_t SizeOfCOMArrayElementIncludingThis(css::Rule* aElement,

   120                                                    mozilla::MallocSizeOf aMallocSizeOf,

   121                                                    void* aData);

   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 };

   130 } // namespace css

   131 } // namespace mozilla

   133 #endif /* mozilla_css_Rule_h___ */

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