Bug 531933. Give HasStateDependentStyle a better signature. r=dbaron

layout/style/nsCSSRuleProcessor.cpp

@@ -2244,9 +2244,8 @@ IsSiblingOperator(PRUnichar oper)
   return oper == PRUnichar('+') || oper == PRUnichar('~');
 }
 
-NS_IMETHODIMP
-nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData,
-                                           nsReStyleHint* aResult)
+nsReStyleHint
+nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData)
 {
   NS_PRECONDITION(aData->mContent->IsNodeOfType(nsINode::eELEMENT),
                   "content must be element");
@@ -2261,8 +2260,8 @@ nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData,
   // "body > p:hover" will be in |cascade->mStateSelectors|).  Note that
   // |IsStateSelector| below determines which selectors are in
   // |cascade->mStateSelectors|.
+  nsReStyleHint hint = nsReStyleHint(0);
   if (cascade) {
-    *aResult = nsReStyleHint(0);
     nsCSSSelector **iter = cascade->mStateSelectors.Elements(),
                   **end = iter + cascade->mStateSelectors.Length();
     for(; iter != end; ++iter) {
@@ -2271,17 +2270,17 @@ nsCSSRuleProcessor::HasStateDependentStyle(StateRuleProcessorData* aData,
       nsReStyleHint possibleChange = IsSiblingOperator(selector->mOperator) ?
         eReStyle_LaterSiblings : eReStyle_Self;
 
-      // If *aResult already includes all the bits of possibleChange,
+      // If hint already includes all the bits of possibleChange,
       // don't bother calling SelectorMatches, since even if it returns false
-      // *aResult won't change.
-      if ((possibleChange & ~(*aResult)) &&
+      // hint won't change.
+      if ((possibleChange & ~hint) &&
           SelectorMatches(*aData, selector, aData->mStateMask, PR_FALSE) &&
           SelectorMatchesTree(*aData, selector->mNext, PR_FALSE)) {
-        *aResult = nsReStyleHint(*aResult | possibleChange);
+        hint = nsReStyleHint(hint | possibleChange);
       }
     }
   }
-  return NS_OK;
+  return hint;
 }
 
 struct AttributeEnumData {

layout/style/nsCSSRuleProcessor.h

@@ -101,8 +101,7 @@ public:
   NS_IMETHOD RulesMatching(XULTreeRuleProcessorData* aData);
 #endif
 
-  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
-                                    nsReStyleHint* aResult);
+  virtual nsReStyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
 
   virtual nsReStyleHint
     HasAttributeDependentStyle(AttributeRuleProcessorData* aData);

layout/style/nsHTMLCSSStyleSheet.cpp

@@ -97,8 +97,7 @@ public:
   NS_IMETHOD RulesMatching(XULTreeRuleProcessorData* aData);
 #endif
 
-  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
-                                    nsReStyleHint* aResult);
+  virtual nsReStyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
 
   virtual nsReStyleHint
     HasAttributeDependentStyle(AttributeRuleProcessorData* aData);
@@ -201,12 +200,10 @@ HTMLCSSStyleSheetImpl::Init(nsIURI* aURL, nsIDocument* aDocument)
 }
 
 // Test if style is dependent on content state
-NS_IMETHODIMP
-HTMLCSSStyleSheetImpl::HasStateDependentStyle(StateRuleProcessorData* aData,
-                                              nsReStyleHint* aResult)
+nsReStyleHint
+HTMLCSSStyleSheetImpl::HasStateDependentStyle(StateRuleProcessorData* aData)
 {
-  *aResult = nsReStyleHint(0);
-  return NS_OK;
+  return nsReStyleHint(0);
 }
 
 // Test if style is dependent on attribute

layout/style/nsHTMLStyleSheet.cpp

@@ -501,23 +501,19 @@ nsHTMLStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
 }
 
 // Test if style is dependent on content state
-NS_IMETHODIMP
-nsHTMLStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData,
-                                         nsReStyleHint* aResult)
+nsReStyleHint
+nsHTMLStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)
 {
-  if (aData->mContent &&
-      aData->mIsHTMLContent &&
+  if (aData->mIsHTMLContent &&
       aData->mContentTag == nsGkAtoms::a &&
       aData->IsLink() &&
       ((mActiveRule && (aData->mStateMask & NS_EVENT_STATE_ACTIVE)) ||
        (mLinkRule && (aData->mStateMask & NS_EVENT_STATE_VISITED)) ||
        (mVisitedRule && (aData->mStateMask & NS_EVENT_STATE_VISITED)))) {
-    *aResult = eReStyle_Self;
+    return eReStyle_Self;
   }
-  else
-    *aResult = nsReStyleHint(0);
-
-  return NS_OK;
+  
+  return nsReStyleHint(0);
 }
 
 nsReStyleHint

layout/style/nsHTMLStyleSheet.h

@@ -84,8 +84,7 @@ public:
 #ifdef MOZ_XUL
   NS_IMETHOD RulesMatching(XULTreeRuleProcessorData* aData);
 #endif
-  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
-                                    nsReStyleHint* aResult);
+  virtual nsReStyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
   virtual nsReStyleHint
     HasAttributeDependentStyle(AttributeRuleProcessorData* aData);
   NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext,

layout/style/nsIStyleRuleProcessor.h

@@ -61,10 +61,10 @@ struct AttributeRuleProcessorData;
 class nsPresContext;
 
 // IID for the nsIStyleRuleProcessor interface
-// {ec92bc0c-9518-48ea-9289-74e654659be9}
+// {566a7bea-fdc5-40a5-bf8a-87b5a231d79e}
 #define NS_ISTYLE_RULE_PROCESSOR_IID     \
-{ 0xec92bc0c, 0x9518, 0x48ea, \
- { 0x92, 0x89, 0x74, 0xe6, 0x54, 0x65, 0x9b, 0xe9 } }
+{ 0x566a7bea, 0xfdc5, 0x40a5, \
+ { 0xbf, 0x8a, 0x87, 0xb5, 0xa2, 0x31, 0xd7, 0x9e } }
 
 /* The style rule processor interface is a mechanism to separate the matching
  * of style rules from style sheet instances.
@@ -117,8 +117,8 @@ public:
    *
    * Event states are defined in nsIEventStateManager.h.
    */
-  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
-                                    nsReStyleHint* aResult) = 0;
+  virtual nsReStyleHint
+    HasStateDependentStyle(StateRuleProcessorData* aData) = 0;
 
   /**
    * This method will be called twice for every attribute change.

layout/style/nsStyleSet.cpp

@@ -1076,8 +1076,7 @@ static PRBool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor,
                                     void *aData)
 {
   StatefulData* data = (StatefulData*)aData;
-  nsReStyleHint hint;
-  aProcessor->HasStateDependentStyle(data, &hint);
+  nsReStyleHint hint = aProcessor->HasStateDependentStyle(data);
   data->mHint = nsReStyleHint(data->mHint | hint);
   return PR_TRUE; // continue
 }

layout/style/nsTransitionManager.cpp

@@ -828,12 +828,10 @@ nsTransitionManager::RulesMatching(XULTreeRuleProcessorData* aData)
 }
 #endif
 
-NS_IMETHODIMP
-nsTransitionManager::HasStateDependentStyle(StateRuleProcessorData* aData,
-                                            nsReStyleHint* aResult)
+nsReStyleHint
+nsTransitionManager::HasStateDependentStyle(StateRuleProcessorData* aData)
 {
-  *aResult = nsReStyleHint(0);
-  return NS_OK;
+  return nsReStyleHint(0);
 }
 
 nsReStyleHint

layout/style/nsTransitionManager.h

@@ -91,8 +91,7 @@ public:
 #ifdef MOZ_XUL
   NS_IMETHOD RulesMatching(XULTreeRuleProcessorData* aData);
 #endif
-  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
-                                    nsReStyleHint* aResult);
+  virtual nsReStyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
   virtual nsReStyleHint
     HasAttributeDependentStyle(AttributeRuleProcessorData* aData);
   NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext,