gecko-dev/layout/style/nsDOMCSSDeclaration.cpp

438 строки
14 KiB
C++

/* -*- 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/. */
/* base class for DOM objects for element.style and cssStyleRule.style */
#include "nsDOMCSSDeclaration.h"
#include "nsCSSParser.h"
#include "mozilla/DeclarationBlockInlines.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/css/Rule.h"
#include "mozilla/dom/CSS2PropertiesBinding.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "mozAutoDocUpdate.h"
#include "nsIURI.h"
#include "mozilla/dom/BindingUtils.h"
#include "nsContentUtils.h"
#include "nsQueryObject.h"
#include "mozilla/layers/ScrollLinkedEffectDetector.h"
using namespace mozilla;
nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
{
}
/* virtual */ JSObject*
nsDOMCSSDeclaration::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return dom::CSS2PropertiesBinding::Wrap(aCx, this, aGivenProto);
}
NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
NS_INTERFACE_TABLE(nsDOMCSSDeclaration,
nsICSSDeclaration,
nsIDOMCSSStyleDeclaration)
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_INTERFACE_MAP_END
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsCSSPropertyID aPropID,
nsAString& aValue)
{
NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
"Should never pass eCSSProperty_UNKNOWN around");
aValue.Truncate();
if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) {
decl->GetPropertyValueByID(aPropID, aValue);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::SetPropertyValue(const nsCSSPropertyID aPropID,
const nsAString& aValue)
{
switch (aPropID) {
case eCSSProperty_background_position:
case eCSSProperty_background_position_x:
case eCSSProperty_background_position_y:
case eCSSProperty_transform:
case eCSSProperty_top:
case eCSSProperty_left:
case eCSSProperty_bottom:
case eCSSProperty_right:
case eCSSProperty_margin:
case eCSSProperty_margin_top:
case eCSSProperty_margin_left:
case eCSSProperty_margin_bottom:
case eCSSProperty_margin_right:
case eCSSProperty_margin_inline_start:
case eCSSProperty_margin_inline_end:
case eCSSProperty_margin_block_start:
case eCSSProperty_margin_block_end:
mozilla::layers::ScrollLinkedEffectDetector::PositioningPropertyMutated();
break;
default:
break;
}
if (aValue.IsEmpty()) {
// If the new value of the property is an empty string we remove the
// property.
return RemovePropertyInternal(aPropID);
}
return ParsePropertyValue(aPropID, aValue, false);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
{
DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read);
aCssText.Truncate();
if (decl) {
decl->ToString(aCssText);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::SetCssText(const nsAString& aCssText)
{
// We don't need to *do* anything with the old declaration, but we need
// to ensure that it exists, or else SetCSSDeclaration may crash.
DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_Modify);
if (!olddecl) {
return NS_ERROR_NOT_AVAILABLE;
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
// rule (see stack in bug 209575).
mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
RefPtr<DeclarationBlock> newdecl;
if (olddecl->IsServo()) {
ServoCSSParsingEnvironment servoEnv = GetServoCSSParsingEnvironment();
if (!servoEnv.mUrlExtraData) {
return NS_ERROR_NOT_AVAILABLE;
}
newdecl = ServoDeclarationBlock::FromCssText(aCssText, servoEnv.mUrlExtraData,
servoEnv.mCompatMode);
} else {
CSSParsingEnvironment geckoEnv;
GetCSSParsingEnvironment(geckoEnv);
if (!geckoEnv.mPrincipal) {
return NS_ERROR_NOT_AVAILABLE;
}
RefPtr<css::Declaration> decl(new css::Declaration());
decl->InitializeEmpty();
nsCSSParser cssParser(geckoEnv.mCSSLoader);
bool changed;
nsresult result = cssParser.ParseDeclarations(aCssText, geckoEnv.mSheetURI,
geckoEnv.mBaseURI, geckoEnv.mPrincipal,
decl, &changed);
if (NS_FAILED(result) || !changed) {
return result;
}
newdecl = decl.forget();
}
return SetCSSDeclaration(newdecl);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetLength(uint32_t* aLength)
{
DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read);
if (decl) {
*aLength = decl->Count();
} else {
*aLength = 0;
}
return NS_OK;
}
already_AddRefed<dom::CSSValue>
nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv)
{
// We don't support CSSValue yet so we'll just return null...
return nullptr;
}
void
nsDOMCSSDeclaration::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName)
{
DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read);
aFound = decl && decl->GetNthProperty(aIndex, aPropName);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
nsAString& aReturn)
{
aReturn.Truncate();
if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) {
decl->GetPropertyValue(aPropertyName, aReturn);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetAuthoredPropertyValue(const nsAString& aPropertyName,
nsAString& aReturn)
{
if (DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read)) {
decl->GetAuthoredPropertyValue(aPropertyName, aReturn);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
nsAString& aReturn)
{
DeclarationBlock* decl = GetCSSDeclaration(eOperation_Read);
aReturn.Truncate();
if (decl && decl->GetPropertyIsImportant(aPropertyName)) {
aReturn.AssignLiteral("important");
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
const nsAString& aValue,
const nsAString& aPriority)
{
if (aValue.IsEmpty()) {
// If the new value of the property is an empty string we remove the
// property.
// XXX this ignores the priority string, should it?
return RemovePropertyInternal(aPropertyName);
}
// In the common (and fast) cases we can use the property id
nsCSSPropertyID propID =
nsCSSProps::LookupProperty(aPropertyName, CSSEnabledState::eForAllContent);
if (propID == eCSSProperty_UNKNOWN) {
return NS_OK;
}
bool important;
if (aPriority.IsEmpty()) {
important = false;
} else if (aPriority.EqualsLiteral("important")) {
important = true;
} else {
// XXX silent failure?
return NS_OK;
}
if (propID == eCSSPropertyExtra_variable) {
return ParseCustomPropertyValue(aPropertyName, aValue, important);
}
return ParsePropertyValue(propID, aValue, important);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
nsAString& aReturn)
{
nsresult rv = GetPropertyValue(aPropertyName, aReturn);
NS_ENSURE_SUCCESS(rv, rv);
return RemovePropertyInternal(aPropertyName);
}
/* static */ void
nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
CSSParsingEnvironment& aCSSParseEnv)
{
StyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
if (!sheet) {
aCSSParseEnv.mPrincipal = nullptr;
return;
}
nsIDocument* document = sheet->GetAssociatedDocument();
aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
aCSSParseEnv.mPrincipal = sheet->Principal();
aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nullptr;
}
/* static */ nsDOMCSSDeclaration::ServoCSSParsingEnvironment
nsDOMCSSDeclaration::GetServoCSSParsingEnvironmentForRule(const css::Rule* aRule)
{
StyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nullptr;
if (!sheet) {
return { nullptr, eCompatibility_FullStandards };
}
if (nsIDocument* document = aRule->GetDocument()) {
return {
sheet->AsServo()->URLData(),
document->GetCompatibilityMode(),
};
}
return {
sheet->AsServo()->URLData(),
eCompatibility_FullStandards,
};
}
template<typename GeckoFunc, typename ServoFunc>
nsresult
nsDOMCSSDeclaration::ModifyDeclaration(GeckoFunc aGeckoFunc,
ServoFunc aServoFunc)
{
DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_Modify);
if (!olddecl) {
return NS_ERROR_NOT_AVAILABLE;
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
// rule (see stack in bug 209575).
mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
RefPtr<DeclarationBlock> decl;
if (olddecl->IsServo() && !olddecl->IsDirty()) {
// In stylo, the old DeclarationBlock is stored in element's rule node tree
// directly, to avoid new values replacing the DeclarationBlock in the tree
// directly, we need to copy the old one here if we haven't yet copied.
// As a result the new value does not replace rule node tree until traversal
// happens.
decl = olddecl->Clone();
} else {
decl = olddecl->EnsureMutable();
}
bool changed;
if (decl->IsGecko()) {
CSSParsingEnvironment geckoEnv;
GetCSSParsingEnvironment(geckoEnv);
if (!geckoEnv.mPrincipal) {
return NS_ERROR_NOT_AVAILABLE;
}
aGeckoFunc(decl->AsGecko(), geckoEnv, &changed);
} else {
ServoCSSParsingEnvironment servoEnv = GetServoCSSParsingEnvironment();
if (!servoEnv.mUrlExtraData) {
return NS_ERROR_NOT_AVAILABLE;
}
changed = aServoFunc(decl->AsServo(), servoEnv);
}
if (!changed) {
// Parsing failed -- but we don't throw an exception for that.
return NS_OK;
}
return SetCSSDeclaration(decl);
}
nsresult
nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSPropertyID aPropID,
const nsAString& aPropValue,
bool aIsImportant)
{
return ModifyDeclaration(
[&](css::Declaration* decl, CSSParsingEnvironment& env, bool* changed) {
nsCSSParser cssParser(env.mCSSLoader);
cssParser.ParseProperty(aPropID, aPropValue,
env.mSheetURI, env.mBaseURI, env.mPrincipal,
decl, changed, aIsImportant);
},
[&](ServoDeclarationBlock* decl, ServoCSSParsingEnvironment& env) {
NS_ConvertUTF16toUTF8 value(aPropValue);
return Servo_DeclarationBlock_SetPropertyById(
decl->Raw(), aPropID, &value, aIsImportant, env.mUrlExtraData,
ParsingMode::Default, env.mCompatMode);
});
}
nsresult
nsDOMCSSDeclaration::ParseCustomPropertyValue(const nsAString& aPropertyName,
const nsAString& aPropValue,
bool aIsImportant)
{
MOZ_ASSERT(nsCSSProps::IsCustomPropertyName(aPropertyName));
return ModifyDeclaration(
[&](css::Declaration* decl, CSSParsingEnvironment& env, bool* changed) {
nsCSSParser cssParser(env.mCSSLoader);
auto propName = Substring(aPropertyName, CSS_CUSTOM_NAME_PREFIX_LENGTH);
cssParser.ParseVariable(propName, aPropValue, env.mSheetURI,
env.mBaseURI, env.mPrincipal, decl,
changed, aIsImportant);
},
[&](ServoDeclarationBlock* decl, ServoCSSParsingEnvironment& env) {
NS_ConvertUTF16toUTF8 property(aPropertyName);
NS_ConvertUTF16toUTF8 value(aPropValue);
return Servo_DeclarationBlock_SetProperty(
decl->Raw(), &property, &value, aIsImportant, env.mUrlExtraData,
ParsingMode::Default, env.mCompatMode);
});
}
nsresult
nsDOMCSSDeclaration::RemovePropertyInternal(nsCSSPropertyID aPropID)
{
DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_RemoveProperty);
if (!olddecl) {
return NS_OK; // no decl, so nothing to remove
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
// rule (see stack in bug 209575).
mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
decl->RemovePropertyByID(aPropID);
return SetCSSDeclaration(decl);
}
nsresult
nsDOMCSSDeclaration::RemovePropertyInternal(const nsAString& aPropertyName)
{
DeclarationBlock* olddecl = GetCSSDeclaration(eOperation_RemoveProperty);
if (!olddecl) {
return NS_OK; // no decl, so nothing to remove
}
// For nsDOMCSSAttributeDeclaration, SetCSSDeclaration will lead to
// Attribute setting code, which leads in turn to BeginUpdate. We
// need to start the update now so that the old rule doesn't get used
// between when we mutate the declaration and when we set the new
// rule (see stack in bug 209575).
mozAutoDocConditionalContentUpdateBatch autoUpdate(DocToUpdate(), true);
RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
decl->RemoveProperty(aPropertyName);
return SetCSSDeclaration(decl);
}