/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * L. David Baron , Mozilla Corporation * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /* * internal abstract interface for containers (roughly origins within * the CSS cascade) that provide style rules matching an element or * pseudo-element */ #ifndef nsIStyleRuleProcessor_h___ #define nsIStyleRuleProcessor_h___ #include "nsISupports.h" #include "nsChangeHint.h" #include "nsIContent.h" struct RuleProcessorData; struct ElementRuleProcessorData; struct PseudoElementRuleProcessorData; struct AnonBoxRuleProcessorData; #ifdef MOZ_XUL struct XULTreeRuleProcessorData; #endif struct StateRuleProcessorData; struct AttributeRuleProcessorData; class nsPresContext; // IID for the nsIStyleRuleProcessor interface // {ec92bc0c-9518-48ea-9289-74e654659be9} #define NS_ISTYLE_RULE_PROCESSOR_IID \ { 0xec92bc0c, 0x9518, 0x48ea, \ { 0x92, 0x89, 0x74, 0xe6, 0x54, 0x65, 0x9b, 0xe9 } } /* The style rule processor interface is a mechanism to separate the matching * of style rules from style sheet instances. * Simple style sheets can and will act as their own processor. * Sheets where rule ordering interlaces between multiple sheets, will need to * share a single rule processor between them (CSS sheets do this for cascading order) * * @see nsIStyleRule (for significantly more detailed comments) */ class nsIStyleRuleProcessor : public nsISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID) // Shorthand for: // nsCOMArray::nsCOMArrayEnumFunc typedef PRBool (* EnumFunc)(nsIStyleRuleProcessor*, void*); /** * Find the |nsIStyleRule|s matching the given content node and * position the given |nsRuleWalker| at the |nsRuleNode| in the rule * tree representing that ordered list of rules (with higher * precedence being farther from the root of the lexicographic tree). */ NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData) = 0; /** * Just like the previous |RulesMatching|, except for a given content * node and pseudo-element. */ NS_IMETHOD RulesMatching(PseudoElementRuleProcessorData* aData) = 0; /** * Just like the previous |RulesMatching|, except for a given anonymous box. */ NS_IMETHOD RulesMatching(AnonBoxRuleProcessorData* aData) = 0; #ifdef MOZ_XUL /** * Just like the previous |RulesMatching|, except for a given content * node and tree pseudo. */ NS_IMETHOD RulesMatching(XULTreeRuleProcessorData* aData) = 0; #endif /** * Return how (as described by nsReStyleHint) style can depend on a * change of the given content state on the given content node. This * test is used for optimization only, and may err on the side of * reporting more dependencies than really exist. * * Event states are defined in nsIEventStateManager.h. */ NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData, nsReStyleHint* aResult) = 0; /** * This method will be called twice for every attribute change. * During the first call, aData->mAttrHasChanged will be false and * the attribute change will not have happened yet. During the * second call, aData->mAttrHasChanged will be true and the * change will have already happened. The bitwise OR of the two * return values must describe the style changes that are needed due * to the attribute change. It's up to the rule processor * implementation to decide how to split the bits up amongst the two * return values. For example, it could return the bits needed by * rules that might stop matching the node from the first call and * the bits needed by rules that might have started matching the * node from the second call. This test is used for optimization * only, and may err on the side of reporting more dependencies than * really exist. */ virtual nsReStyleHint HasAttributeDependentStyle(AttributeRuleProcessorData* aData) = 0; /** * Do any processing that needs to happen as a result of a change in * the characteristics of the medium, and return whether this rule * processor's rules have changed (e.g., because of media queries). */ NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext, PRBool* aRulesChanged) = 0; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleRuleProcessor, NS_ISTYLE_RULE_PROCESSOR_IID) #endif /* nsIStyleRuleProcessor_h___ */