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137 lines
5.0 KiB
C++
137 lines
5.0 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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/*
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* internal abstract interface for containers (roughly origins within
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* the CSS cascade) that provide style rules matching an element or
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* pseudo-element
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*/
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#ifndef nsIStyleRuleProcessor_h___
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#define nsIStyleRuleProcessor_h___
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#include "mozilla/MemoryReporting.h"
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#include "nsISupports.h"
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#include "nsChangeHint.h"
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struct RuleProcessorData;
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struct ElementRuleProcessorData;
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struct PseudoElementRuleProcessorData;
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struct AnonBoxRuleProcessorData;
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#ifdef MOZ_XUL
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struct XULTreeRuleProcessorData;
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#endif
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struct StateRuleProcessorData;
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struct AttributeRuleProcessorData;
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class nsPresContext;
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// IID for the nsIStyleRuleProcessor interface
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// {c1d6001e-4fcb-4c40-bce1-5eba80bfd8f3}
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#define NS_ISTYLE_RULE_PROCESSOR_IID \
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{ 0xc1d6001e, 0x4fcb, 0x4c40, \
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{0xbc, 0xe1, 0x5e, 0xba, 0x80, 0xbf, 0xd8, 0xf3} }
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/* The style rule processor interface is a mechanism to separate the matching
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* of style rules from style sheet instances.
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* Simple style sheets can and will act as their own processor.
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* Sheets where rule ordering interlaces between multiple sheets, will need to
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* share a single rule processor between them (CSS sheets do this for cascading order)
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*
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* @see nsIStyleRule (for significantly more detailed comments)
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*/
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class nsIStyleRuleProcessor : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID)
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// Shorthand for:
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// nsCOMArray<nsIStyleRuleProcessor>::nsCOMArrayEnumFunc
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typedef bool (* EnumFunc)(nsIStyleRuleProcessor*, void*);
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/**
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* Find the |nsIStyleRule|s matching the given content node and
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* position the given |nsRuleWalker| at the |nsRuleNode| in the rule
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* tree representing that ordered list of rules (with higher
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* precedence being farther from the root of the lexicographic tree).
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*/
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virtual void RulesMatching(ElementRuleProcessorData* aData) = 0;
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/**
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* Just like the previous |RulesMatching|, except for a given content
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* node <em>and pseudo-element</em>.
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*/
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virtual void RulesMatching(PseudoElementRuleProcessorData* aData) = 0;
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/**
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* Just like the previous |RulesMatching|, except for a given anonymous box.
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*/
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virtual void RulesMatching(AnonBoxRuleProcessorData* aData) = 0;
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#ifdef MOZ_XUL
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/**
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* Just like the previous |RulesMatching|, except for a given content
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* node <em>and tree pseudo</em>.
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*/
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virtual void RulesMatching(XULTreeRuleProcessorData* aData) = 0;
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#endif
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/**
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* Return whether style can depend on a change of the given document state.
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*
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* Document states are defined in nsIDocument.h.
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*/
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virtual bool
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HasDocumentStateDependentStyle(StateRuleProcessorData* aData) = 0;
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/**
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* Return how (as described by nsRestyleHint) style can depend on a
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* change of the given content state on the given content node. This
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* test is used for optimization only, and may err on the side of
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* reporting more dependencies than really exist.
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*
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* Event states are defined in nsEventStates.h.
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*/
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virtual nsRestyleHint
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HasStateDependentStyle(StateRuleProcessorData* aData) = 0;
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/**
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* This method will be called twice for every attribute change.
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* During the first call, aData->mAttrHasChanged will be false and
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* the attribute change will not have happened yet. During the
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* second call, aData->mAttrHasChanged will be true and the
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* change will have already happened. The bitwise OR of the two
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* return values must describe the style changes that are needed due
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* to the attribute change. It's up to the rule processor
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* implementation to decide how to split the bits up amongst the two
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* return values. For example, it could return the bits needed by
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* rules that might stop matching the node from the first call and
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* the bits needed by rules that might have started matching the
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* node from the second call. This test is used for optimization
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* only, and may err on the side of reporting more dependencies than
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* really exist.
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*/
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virtual nsRestyleHint
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HasAttributeDependentStyle(AttributeRuleProcessorData* aData) = 0;
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/**
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* Do any processing that needs to happen as a result of a change in
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* the characteristics of the medium, and return whether this rule
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* processor's rules have changed (e.g., because of media queries).
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*/
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virtual bool MediumFeaturesChanged(nsPresContext* aPresContext) = 0;
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/**
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* Report the size of this style rule processor to about:memory. A
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* processor may return 0.
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*/
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virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const = 0;
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virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleRuleProcessor,
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NS_ISTYLE_RULE_PROCESSOR_IID)
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#endif /* nsIStyleRuleProcessor_h___ */
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