layout/style/nsHTMLCSSStyleSheet.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /*
   8  * style sheet and style rule processor representing style attributes
   9  */
  10
  11 #include "nsHTMLCSSStyleSheet.h"
  12 #include "mozilla/MemoryReporting.h"
  13 #include "mozilla/DeclarationBlock.h"
  14 #include "nsPresContext.h"
  15 #include "mozilla/dom/Element.h"
  16 #include "nsAttrValue.h"
  17 #include "nsAttrValueInlines.h"
  18 #include "nsCSSPseudoElements.h"
  19 #include "mozilla/RestyleManager.h"
  20
  21 using namespace mozilla;
  22 using namespace mozilla::dom;
  23
  24 nsHTMLCSSStyleSheet::nsHTMLCSSStyleSheet() = default;
  25
  26 nsHTMLCSSStyleSheet::~nsHTMLCSSStyleSheet() {
  27   // We may go away before all of our cached style attributes do,
  28   // so clean up any that are left.
  29   for (auto iter = mCachedStyleAttrs.Iter(); !iter.Done(); iter.Next()) {
  30     MiscContainer*& value = iter.Data();
  31
  32     // Ideally we'd just call MiscContainer::Evict, but we can't do that since
  33     // we're iterating the hashtable.
  34     if (value->mType == nsAttrValue::eCSSDeclaration) {
  35       DeclarationBlock* declaration = value->mValue.mCSSDeclaration;
  36       declaration->SetHTMLCSSStyleSheet(nullptr);
  37     } else {
  38       MOZ_ASSERT_UNREACHABLE("unexpected cached nsAttrValue type");
  39     }
  40
  41     value->mValue.mCached = 0;
  42     iter.Remove();
  43   }
  44 }
  45
  46 void nsHTMLCSSStyleSheet::CacheStyleAttr(const nsAString& aSerialized,
  47                                          MiscContainer* aValue) {
  48   mCachedStyleAttrs.Put(aSerialized, aValue);
  49 }
  50
  51 void nsHTMLCSSStyleSheet::EvictStyleAttr(const nsAString& aSerialized,
  52                                          MiscContainer* aValue) {
  53 #ifdef DEBUG
  54   {
  55     NS_ASSERTION(aValue == mCachedStyleAttrs.Get(aSerialized),
  56                  "Cached value does not match?!");
  57   }
  58 #endif
  59   mCachedStyleAttrs.Remove(aSerialized);
  60 }
  61
  62 MiscContainer* nsHTMLCSSStyleSheet::LookupStyleAttr(
  63     const nsAString& aSerialized) {
  64   return mCachedStyleAttrs.Get(aSerialized);
  65 }