tor-browser

The Tor Browser
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AttributeStyles.cpp (3598B)

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