layout/style/AttributeStyles.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 /* Data from presentational HTML attributes and style attributes */
   8
   9 #include "mozilla/AttributeStyles.h"
  10
  11 #include "nsGkAtoms.h"
  12 #include "nsPresContext.h"
  13 #include "mozilla/dom/Document.h"
  14 #include "mozilla/dom/DocumentInlines.h"
  15 #include "mozilla/dom/Element.h"
  16 #include "nsStyleConsts.h"
  17 #include "nsError.h"
  18 #include "nsHashKeys.h"
  19 #include "mozilla/DeclarationBlock.h"
  20 #include "mozilla/MemoryReporting.h"
  21 #include "mozilla/OperatorNewExtensions.h"
  22 #include "mozilla/PresShell.h"
  23 #include "mozilla/RestyleManager.h"
  24 #include "mozilla/ServoBindings.h"
  25 #include "mozilla/ServoStyleSet.h"
  26
  27 using namespace mozilla::dom;
  28
  29 namespace mozilla {
  30
  31 // -----------------------------------------------------------
  32
  33 AttributeStyles::AttributeStyles(Document* aDocument) : mDocument(aDocument) {
  34   MOZ_ASSERT(aDocument);
  35 }
  36
  37 void AttributeStyles::SetOwningDocument(Document* aDocument) {
  38   mDocument = aDocument;  // not refcounted
  39 }
  40
  41 void AttributeStyles::Reset() {
  42   mServoUnvisitedLinkDecl = nullptr;
  43   mServoVisitedLinkDecl = nullptr;
  44   mServoActiveLinkDecl = nullptr;
  45 }
  46
  47 nsresult AttributeStyles::ImplLinkColorSetter(
  48     RefPtr<StyleLockedDeclarationBlock>& aDecl, nscolor aColor) {
  49   if (!mDocument || !mDocument->GetPresShell()) {
  50     return NS_OK;
  51   }
  52
  53   MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal());
  54   aDecl = Servo_DeclarationBlock_CreateEmpty().Consume();
  55   Servo_DeclarationBlock_SetColorValue(aDecl.get(), eCSSProperty_color, aColor);
  56
  57   // Now make sure we restyle any links that might need it.  This
  58   // shouldn't happen often, so just rebuilding everything is ok.
  59   if (Element* root = mDocument->GetRootElement()) {
  60     RestyleManager* rm = mDocument->GetPresContext()->RestyleManager();
  61     rm->PostRestyleEvent(root, RestyleHint::RestyleSubtree(), nsChangeHint(0));
  62   }
  63   return NS_OK;
  64 }
  65
  66 nsresult AttributeStyles::SetLinkColor(nscolor aColor) {
  67   return ImplLinkColorSetter(mServoUnvisitedLinkDecl, aColor);
  68 }
  69
  70 nsresult AttributeStyles::SetActiveLinkColor(nscolor aColor) {
  71   return ImplLinkColorSetter(mServoActiveLinkDecl, aColor);
  72 }
  73
  74 nsresult AttributeStyles::SetVisitedLinkColor(nscolor aColor) {
  75   return ImplLinkColorSetter(mServoVisitedLinkDecl, aColor);
  76 }
  77
  78 size_t AttributeStyles::DOMSizeOfIncludingThis(
  79     MallocSizeOf aMallocSizeOf) const {
  80   size_t n = aMallocSizeOf(this);
  81   // Measurement of the following members may be added later if DMD finds it is
  82   // worthwhile:
  83   // - mServoUnvisitedLinkDecl;
  84   // - mServoVisitedLinkDecl;
  85   // - mServoActiveLinkDecl;
  86   //
  87   // The following members are not measured:
  88   // - mDocument, because it's non-owning
  89   return n;
  90 }
  91
  92 AttributeStyles::~AttributeStyles() {
  93   // We may go away before all of our cached style attributes do, so clean up
  94   // any that are left.
  95   for (auto iter = mCachedStyleAttrs.Iter(); !iter.Done(); iter.Next()) {
  96     MiscContainer*& value = iter.Data();
  97
  98     // Ideally we'd just call MiscContainer::Evict, but we can't do that since
  99     // we're iterating the hashtable.
 100     if (value->mType == nsAttrValue::eCSSDeclaration) {
 101       DeclarationBlock* declaration = value->mValue.mCSSDeclaration;
 102       declaration->SetAttributeStyles(nullptr);
 103     } else {
 104       MOZ_ASSERT_UNREACHABLE("unexpected cached nsAttrValue type");
 105     }
 106
 107     value->mValue.mCached = 0;
 108     iter.Remove();
 109   }
 110 }
 111
 112 }  // namespace mozilla