gecko-dev/dom/base/nsStyledElement.cpp

239 строки
7.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "nsStyledElement.h"
#include "mozAutoDocUpdate.h"
#include "nsGkAtoms.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/StaticPrefs.h"
#include "nsDOMCSSDeclaration.h"
#include "nsDOMCSSAttrDeclaration.h"
#include "nsServiceManagerUtils.h"
#include "nsIDocument.h"
#include "mozilla/DeclarationBlock.h"
#include "mozilla/css/Loader.h"
#include "nsXULElement.h"
#include "nsContentUtils.h"
#include "nsStyleUtil.h"
using namespace mozilla;
using namespace mozilla::dom;
// Use the CC variant of this, even though this class does not define
// a new CC participant, to make QIing to the CC interfaces faster.
NS_IMPL_QUERY_INTERFACE_CYCLE_COLLECTION_INHERITED(nsStyledElement,
nsStyledElementBase,
nsStyledElement)
//----------------------------------------------------------------------
// nsIContent methods
bool
nsStyledElement::ParseAttribute(int32_t aNamespaceID,
nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult)
{
if (aAttribute == nsGkAtoms::style && aNamespaceID == kNameSpaceID_None) {
ParseStyleAttribute(aValue, aMaybeScriptedPrincipal, aResult, false);
return true;
}
return nsStyledElementBase::ParseAttribute(aNamespaceID, aAttribute, aValue,
aMaybeScriptedPrincipal, aResult);
}
nsresult
nsStyledElement::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValueOrString* aValue, bool aNotify)
{
if (aNamespaceID == kNameSpaceID_None) {
if (aName == nsGkAtoms::style) {
if (aValue) {
SetMayHaveStyle();
}
}
}
return nsStyledElementBase::BeforeSetAttr(aNamespaceID, aName, aValue,
aNotify);
}
void
nsStyledElement::InlineStyleDeclarationWillChange(MutationClosureData& aData)
{
MOZ_ASSERT(OwnerDoc()->UpdateNestingLevel() > 0,
"Should be inside document update!");
bool modification = false;
if (MayHaveStyle()) {
bool needsOldValue =
!StaticPrefs::dom_mutation_events_cssom_disabled() &&
nsContentUtils::HasMutationListeners(this,
NS_EVENT_BITS_MUTATION_ATTRMODIFIED,
this);
if (!needsOldValue) {
CustomElementDefinition* definition = GetCustomElementDefinition();
if (definition && definition->IsInObservedAttributeList(nsGkAtoms::style)) {
needsOldValue = true;
}
}
if (needsOldValue) {
nsAutoString oldValueStr;
modification = GetAttr(kNameSpaceID_None, nsGkAtoms::style,
oldValueStr);
if (modification) {
aData.mOldValue.emplace();
aData.mOldValue->SetTo(oldValueStr);
}
} else {
modification = HasAttr(kNameSpaceID_None, nsGkAtoms::style);
}
}
aData.mModType = modification ?
static_cast<uint8_t>(MutationEvent_Binding::MODIFICATION) :
static_cast<uint8_t>(MutationEvent_Binding::ADDITION);
nsNodeUtils::AttributeWillChange(this, kNameSpaceID_None,
nsGkAtoms::style,
aData.mModType, nullptr);
//XXXsmaug In order to make attribute handling more consistent, consider to
// call BeforeSetAttr and pass kCallAfterSetAttr to
// SetAttrAndNotify in SetInlineStyleDeclaration.
// Handling of mozAutoDocUpdate may require changes in that case.
}
nsresult
nsStyledElement::SetInlineStyleDeclaration(DeclarationBlock& aDeclaration,
MutationClosureData& aData)
{
MOZ_ASSERT(OwnerDoc()->UpdateNestingLevel(),
"Should be inside document update!");
bool hasListeners =
!StaticPrefs::dom_mutation_events_cssom_disabled() &&
nsContentUtils::HasMutationListeners(this,
NS_EVENT_BITS_MUTATION_ATTRMODIFIED,
this);
nsAttrValue attrValue(do_AddRef(&aDeclaration), nullptr);
SetMayHaveStyle();
nsIDocument* document = GetComposedDoc();
mozAutoDocUpdate updateBatch(document, true);
return SetAttrAndNotify(kNameSpaceID_None, nsGkAtoms::style, nullptr,
aData.mOldValue.ptrOr(nullptr),
attrValue, nullptr, aData.mModType,
hasListeners, true, kDontCallAfterSetAttr,
document, updateBatch);
}
// ---------------------------------------------------------------
// Others and helpers
nsICSSDeclaration*
nsStyledElement::Style()
{
Element::nsDOMSlots *slots = DOMSlots();
if (!slots->mStyle) {
// Just in case...
ReparseStyleAttribute(true, false);
slots->mStyle = new nsDOMCSSAttributeDeclaration(this, false);
SetMayHaveStyle();
}
return slots->mStyle;
}
nsresult
nsStyledElement::ReparseStyleAttribute(bool aForceInDataDoc, bool aForceIfAlreadyParsed)
{
if (!MayHaveStyle()) {
return NS_OK;
}
const nsAttrValue* oldVal = mAttrs.GetAttr(nsGkAtoms::style);
if (oldVal && (aForceIfAlreadyParsed || oldVal->Type() != nsAttrValue::eCSSDeclaration)) {
nsAttrValue attrValue;
nsAutoString stringValue;
oldVal->ToString(stringValue);
ParseStyleAttribute(stringValue, nullptr, attrValue, aForceInDataDoc);
// Don't bother going through SetInlineStyleDeclaration; we don't
// want to fire off mutation events or document notifications anyway
bool oldValueSet;
nsresult rv = mAttrs.SetAndSwapAttr(nsGkAtoms::style, attrValue,
&oldValueSet);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
void
nsStyledElement::NodeInfoChanged(nsIDocument* aOldDoc)
{
nsStyledElementBase::NodeInfoChanged(aOldDoc);
}
nsICSSDeclaration*
nsStyledElement::GetExistingStyle()
{
Element::nsDOMSlots* slots = GetExistingDOMSlots();
if (!slots) {
return nullptr;
}
return slots->mStyle;
}
void
nsStyledElement::ParseStyleAttribute(const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult,
bool aForceInDataDoc)
{
nsIDocument* doc = OwnerDoc();
bool isNativeAnon = IsInNativeAnonymousSubtree();
if (!isNativeAnon &&
!nsStyleUtil::CSPAllowsInlineStyle(this, NodePrincipal(),
aMaybeScriptedPrincipal,
doc->GetDocumentURI(), 0, 0, aValue,
nullptr))
return;
if (aForceInDataDoc ||
!doc->IsLoadedAsData() ||
GetExistingStyle() ||
doc->IsStaticDocument()) {
bool isCSS = true; // assume CSS until proven otherwise
if (!isNativeAnon) { // native anonymous content always assumes CSS
nsAutoString styleType;
doc->GetHeaderData(nsGkAtoms::headerContentStyleType, styleType);
if (!styleType.IsEmpty()) {
static const char textCssStr[] = "text/css";
isCSS = (styleType.EqualsIgnoreCase(textCssStr, sizeof(textCssStr) - 1));
}
}
if (isCSS && aResult.ParseStyleAttribute(aValue, aMaybeScriptedPrincipal,
this)) {
return;
}
}
aResult.SetTo(aValue);
}