layout/style/nsHTMLCSSStyleSheet.cpp

   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/. */
   5
   6 /*
   7  * style sheet and style rule processor representing style attributes
   8  */
   9
  10 #include "nsHTMLCSSStyleSheet.h"
  11 #include "mozilla/MemoryReporting.h"
  12 #include "mozilla/css/StyleRule.h"
  13 #include "nsIStyleRuleProcessor.h"
  14 #include "nsPresContext.h"
  15 #include "nsRuleWalker.h"
  16 #include "nsRuleProcessorData.h"
  17 #include "mozilla/dom/Element.h"
  18 #include "nsAttrValue.h"
  19 #include "nsAttrValueInlines.h"
  20 #include "RestyleManager.h"
  21
  22 using namespace mozilla;
  23 using namespace mozilla::dom;
  24
  25 namespace {
  26
  27 PLDHashOperator
  28 ClearAttrCache(const nsAString& aKey, MiscContainer*& aValue, void*)
  29 {
  30   // Ideally we'd just call MiscContainer::Evict, but we can't do that since
  31   // we're iterating the hashtable.
  32   MOZ_ASSERT(aValue->mType == nsAttrValue::eCSSStyleRule);
  33
  34   aValue->mValue.mCSSStyleRule->SetHTMLCSSStyleSheet(nullptr);
  35   aValue->mValue.mCached = 0;
  36
  37   return PL_DHASH_REMOVE;
  38 }
  39
  40 } // anonymous namespace
  41
  42 nsHTMLCSSStyleSheet::nsHTMLCSSStyleSheet()
  43 {
  44 }
  45
  46 nsHTMLCSSStyleSheet::~nsHTMLCSSStyleSheet()
  47 {
  48   // We may go away before all of our cached style attributes do,
  49   // so clean up any that are left.
  50   mCachedStyleAttrs.Enumerate(ClearAttrCache, nullptr);
  51 }
  52
  53 NS_IMPL_ISUPPORTS(nsHTMLCSSStyleSheet, nsIStyleRuleProcessor)
  54
  55 /* virtual */ void
  56 nsHTMLCSSStyleSheet::RulesMatching(ElementRuleProcessorData* aData)
  57 {
  58   ElementRulesMatching(aData->mPresContext, aData->mElement,
  59                        aData->mRuleWalker);
  60 }
  61
  62 void
  63 nsHTMLCSSStyleSheet::ElementRulesMatching(nsPresContext* aPresContext,
  64                                           Element* aElement,
  65                                           nsRuleWalker* aRuleWalker)
  66 {
  67   // just get the one and only style rule from the content's STYLE attribute
  68   css::StyleRule* rule = aElement->GetInlineStyleRule();
  69   if (rule) {
  70     rule->RuleMatched();
  71     aRuleWalker->Forward(rule);
  72   }
  73
  74   rule = aElement->GetSMILOverrideStyleRule();
  75   if (rule) {
  76     RestyleManager* restyleManager = aPresContext->RestyleManager();
  77     if (restyleManager->SkipAnimationRules()) {
  78       // Non-animation restyle -- don't process SMIL override style, because we
  79       // don't want SMIL animation to trigger new CSS transitions. Instead,
  80       // request an Animation restyle, so we still get noticed.
  81       if (restyleManager->PostAnimationRestyles()) {
  82         aPresContext->PresShell()->RestyleForAnimation(aElement,
  83           eRestyle_StyleAttribute | eRestyle_ChangeAnimationPhase);
  84       }
  85     } else {
  86       // Animation restyle (or non-restyle traversal of rules)
  87       // Now we can walk SMIL overrride style, without triggering transitions.
  88       rule->RuleMatched();
  89       aRuleWalker->Forward(rule);
  90     }
  91   }
  92 }
  93
  94 /* virtual */ void
  95 nsHTMLCSSStyleSheet::RulesMatching(PseudoElementRuleProcessorData* aData)
  96 {
  97   if (nsCSSPseudoElements::PseudoElementSupportsStyleAttribute(aData->mPseudoType) &&
  98       aData->mPseudoElement) {
  99     // just get the one and only style rule from the content's STYLE attribute
 100     css::StyleRule* rule = aData->mPseudoElement->GetInlineStyleRule();
 101     if (rule) {
 102       rule->RuleMatched();
 103       aData->mRuleWalker->Forward(rule);
 104     }
 105   }
 106 }
 107
 108 /* virtual */ void
 109 nsHTMLCSSStyleSheet::RulesMatching(AnonBoxRuleProcessorData* aData)
 110 {
 111 }
 112
 113 #ifdef MOZ_XUL
 114 /* virtual */ void
 115 nsHTMLCSSStyleSheet::RulesMatching(XULTreeRuleProcessorData* aData)
 116 {
 117 }
 118 #endif
 119
 120 // Test if style is dependent on content state
 121 /* virtual */ nsRestyleHint
 122 nsHTMLCSSStyleSheet::HasStateDependentStyle(StateRuleProcessorData* aData)
 123 {
 124   return nsRestyleHint(0);
 125 }
 126
 127 /* virtual */ nsRestyleHint
 128 nsHTMLCSSStyleSheet::HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData)
 129 {
 130   return nsRestyleHint(0);
 131 }
 132
 133 /* virtual */ bool
 134 nsHTMLCSSStyleSheet::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
 135 {
 136   return false;
 137 }
 138
 139 // Test if style is dependent on attribute
 140 /* virtual */ nsRestyleHint
 141 nsHTMLCSSStyleSheet::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
 142 {
 143   // Perhaps should check that it's XUL, SVG, (or HTML) namespace, but
 144   // it doesn't really matter.
 145   if (aData->mAttrHasChanged && aData->mAttribute == nsGkAtoms::style) {
 146     return eRestyle_StyleAttribute | eRestyle_ChangeAnimationPhase;
 147   }
 148
 149   return nsRestyleHint(0);
 150 }
 151
 152 /* virtual */ bool
 153 nsHTMLCSSStyleSheet::MediumFeaturesChanged(nsPresContext* aPresContext)
 154 {
 155   return false;
 156 }
 157
 158 size_t
 159 SizeOfCachedStyleAttrsEntryExcludingThis(nsStringHashKey::KeyType& aKey,
 160                                          MiscContainer* const& aData,
 161                                          mozilla::MallocSizeOf aMallocSizeOf,
 162                                          void* userArg)
 163 {
 164   // We don't own the MiscContainers so we don't count them. We do care about
 165   // the size of the nsString members in the keys though.
 166   return aKey.SizeOfExcludingThisIfUnshared(aMallocSizeOf);
 167 }
 168
 169 /* virtual */ size_t
 170 nsHTMLCSSStyleSheet::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
 171 {
 172   // The size of mCachedStyleAttrs's mTable member (a PLDHashTable) is
 173   // significant in itself, but more significant is the size of the nsString
 174   // members of the nsStringHashKeys.
 175   return mCachedStyleAttrs.SizeOfExcludingThis(SizeOfCachedStyleAttrsEntryExcludingThis,
 176                                                aMallocSizeOf,
 177                                                nullptr);
 178 }
 179
 180 /* virtual */ size_t
 181 nsHTMLCSSStyleSheet::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
 182 {
 183   return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
 184 }
 185
 186 void
 187 nsHTMLCSSStyleSheet::CacheStyleAttr(const nsAString& aSerialized,
 188                                     MiscContainer* aValue)
 189 {
 190   mCachedStyleAttrs.Put(aSerialized, aValue);
 191 }
 192
 193 void
 194 nsHTMLCSSStyleSheet::EvictStyleAttr(const nsAString& aSerialized,
 195                                     MiscContainer* aValue)
 196 {
 197 #ifdef DEBUG
 198   {
 199     NS_ASSERTION(aValue = mCachedStyleAttrs.Get(aSerialized),
 200                  "Cached value does not match?!");
 201   }
 202 #endif
 203   mCachedStyleAttrs.Remove(aSerialized);
 204 }
 205
 206 MiscContainer*
 207 nsHTMLCSSStyleSheet::LookupStyleAttr(const nsAString& aSerialized)
 208 {
 209   return mCachedStyleAttrs.Get(aSerialized);
 210 }