зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
5.0 KiB
C++
127 строки
5.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsISupports.h"
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#include "nsChangeHint.h"
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#include "nsIContent.h"
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struct RuleProcessorData;
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struct ElementRuleProcessorData;
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struct PseudoRuleProcessorData;
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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 {a4ec760e-6bfb-4b9f-bd08-9d1c23b700f6}
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#define NS_ISTYLE_RULE_PROCESSOR_IID \
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{ 0xa4ec760e, 0x6bfb, 0x4b9f, \
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{ 0xbd, 0x08, 0x9d, 0x1c, 0x23, 0xb7, 0x00, 0xf6 } }
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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 PRBool (* 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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NS_IMETHOD 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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NS_IMETHOD RulesMatching(PseudoRuleProcessorData* 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 nsIEventStateManager.h.
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*/
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NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
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nsReStyleHint* aResult) = 0;
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/**
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* Return how (as described by nsReStyleHint) style can depend on the
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* presence or value of the given attribute for the given content
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* node. This test is used for optimization only, and may err on the
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* side of reporting more dependencies than 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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NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext,
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PRBool* aRulesChanged) = 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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