DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* DOM object for element.style */

#include "nsDOMCSSAttrDeclaration.h"

#include "mozilla/css/Declaration.h"
#include "mozilla/css/StyleRule.h"
#include "mozilla/dom/Element.h"
#include "nsIDocument.h"
#include "nsIDOMMutationEvent.h"
#include "nsIURI.h"
#include "nsNodeUtils.h"
#include "nsWrapperCacheInlines.h"
#include "nsIFrame.h"
#include "ActiveLayerTracker.h"

using namespace mozilla;

nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(dom::Element* aElement,
                                                           bool aIsSMILOverride)
  : mElement(aElement)
  , mIsSMILOverride(aIsSMILOverride)
{
  MOZ_COUNT_CTOR(nsDOMCSSAttributeDeclaration);

  NS_ASSERTION(aElement, "Inline style for a NULL element?");
}

nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration()
{
  MOZ_COUNT_DTOR(nsDOMCSSAttributeDeclaration);
}

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(nsDOMCSSAttributeDeclaration, mElement)

// mElement holds a strong ref to us, so if it's going to be
// skipped, the attribute declaration can't be part of a garbage
// cycle.
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMCSSAttributeDeclaration)
  if (tmp->mElement && Element::CanSkip(tmp->mElement, true)) {
    if (tmp->PreservingWrapper()) {
      // This marks the wrapper black.
      tmp->GetWrapper();
    }
    return true;
  }
  return tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMCSSAttributeDeclaration)
  return tmp->IsBlack() ||
    (tmp->mElement && Element::CanSkipInCC(tmp->mElement));
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMCSSAttributeDeclaration)
  return tmp->IsBlack() ||
    (tmp->mElement && Element::CanSkipThis(tmp->mElement));
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMCSSAttributeDeclaration)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_IMPL_QUERY_TAIL_INHERITING(nsDOMCSSDeclaration)

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMCSSAttributeDeclaration)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMCSSAttributeDeclaration)

nsresult
nsDOMCSSAttributeDeclaration::SetCSSDeclaration(css::Declaration* aDecl)
{
  NS_ASSERTION(mElement, "Must have Element to set the declaration!");
  css::StyleRule* oldRule =
    mIsSMILOverride ? mElement->GetSMILOverrideStyleRule() :
    mElement->GetInlineStyleRule();
  NS_ASSERTION(oldRule, "Element must have rule");

  nsRefPtr<css::StyleRule> newRule =
    oldRule->DeclarationChanged(aDecl, false);
  if (!newRule) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return
    mIsSMILOverride ? mElement->SetSMILOverrideStyleRule(newRule, true) :
    mElement->SetInlineStyleRule(newRule, nullptr, true);
}

nsIDocument*
nsDOMCSSAttributeDeclaration::DocToUpdate()
{
  // XXXbz this is a bit of a hack, especially doing it before the
  // BeginUpdate(), but this is a good chokepoint where we know we
  // plan to modify the CSSDeclaration, so need to notify
  // AttributeWillChange if this is inline style.
  if (!mIsSMILOverride) {
    nsNodeUtils::AttributeWillChange(mElement, kNameSpaceID_None,
                                     nsGkAtoms::style,
                                     nsIDOMMutationEvent::MODIFICATION);
  }
 
  // We need OwnerDoc() rather than GetCurrentDoc() because it might
  // be the BeginUpdate call that inserts mElement into the document.
  return mElement->OwnerDoc();
}

css::Declaration*
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(bool aAllocate)
{
  if (!mElement)
    return nullptr;

  css::StyleRule* cssRule;
  if (mIsSMILOverride)
    cssRule = mElement->GetSMILOverrideStyleRule();
  else
    cssRule = mElement->GetInlineStyleRule();

  if (cssRule) {
    return cssRule->GetDeclaration();
  }
  if (!aAllocate) {
    return nullptr;
  }

  // cannot fail
  css::Declaration *decl = new css::Declaration();
  decl->InitializeEmpty();
  nsRefPtr<css::StyleRule> newRule = new css::StyleRule(nullptr, decl);

  // this *can* fail (inside SetAttrAndNotify, at least).
  nsresult rv;
  if (mIsSMILOverride)
    rv = mElement->SetSMILOverrideStyleRule(newRule, false);
  else
    rv = mElement->SetInlineStyleRule(newRule, nullptr, false);

  if (NS_FAILED(rv)) {
    return nullptr; // the decl will be destroyed along with the style rule
  }

  return decl;
}

void
nsDOMCSSAttributeDeclaration::GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv)
{
  NS_ASSERTION(mElement, "Something is severely broken -- there should be an Element here!");

  nsIDocument* doc = mElement->OwnerDoc();
  aCSSParseEnv.mSheetURI = doc->GetDocumentURI();
  aCSSParseEnv.mBaseURI = mElement->GetBaseURI();
  aCSSParseEnv.mPrincipal = mElement->NodePrincipal();
  aCSSParseEnv.mCSSLoader = doc->CSSLoader();
}

NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::GetParentRule(nsIDOMCSSRule **aParent)
{
  NS_ENSURE_ARG_POINTER(aParent);

  *aParent = nullptr;
  return NS_OK;
}

/* virtual */ nsINode*
nsDOMCSSAttributeDeclaration::GetParentObject()
{
  return mElement;
}

NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
                                               const nsAString& aValue)
{
  // Scripted modifications to style.opacity or style.transform
  // could immediately force us into the animated state if heuristics suggest
  // this is scripted animation.
  if (aPropID == eCSSProperty_opacity || aPropID == eCSSProperty_transform ||
      aPropID == eCSSProperty_left || aPropID == eCSSProperty_top ||
      aPropID == eCSSProperty_right || aPropID == eCSSProperty_bottom ||
      aPropID == eCSSProperty_margin_left || aPropID == eCSSProperty_margin_top ||
      aPropID == eCSSProperty_margin_right || aPropID == eCSSProperty_margin_bottom) {
    nsIFrame* frame = mElement->GetPrimaryFrame();
    if (frame) {
      ActiveLayerTracker::NotifyInlineStyleRuleModified(frame, aPropID);
    }
  }
  return nsDOMCSSDeclaration::SetPropertyValue(aPropID, aValue);
}