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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ChangeStyleTransaction.h"
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#include "mozilla/dom/Element.h" // for Element
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#include "nsAString.h" // for nsAString::Append, etc.
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#include "nsCRT.h" // for nsCRT::IsAsciiSpace
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#include "nsDebug.h" // for NS_ENSURE_SUCCESS, etc.
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#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc.
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#include "nsGkAtoms.h" // for nsGkAtoms, etc.
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#include "nsICSSDeclaration.h" // for nsICSSDeclaration.
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#include "nsLiteralString.h" // for NS_LITERAL_STRING, etc.
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#include "nsReadableUtils.h" // for ToNewUnicode
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#include "nsString.h" // for nsAutoString, nsString, etc.
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#include "nsStyledElement.h" // for nsStyledElement.
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#include "nsUnicharUtils.h" // for nsCaseInsensitiveStringComparator
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namespace mozilla {
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using namespace dom;
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// static
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already_AddRefed<ChangeStyleTransaction> ChangeStyleTransaction::Create(
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Element& aElement, nsAtom& aProperty, const nsAString& aValue) {
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RefPtr<ChangeStyleTransaction> transaction =
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new ChangeStyleTransaction(aElement, aProperty, aValue, false);
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return transaction.forget();
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}
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// static
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already_AddRefed<ChangeStyleTransaction> ChangeStyleTransaction::CreateToRemove(
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Element& aElement, nsAtom& aProperty, const nsAString& aValue) {
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RefPtr<ChangeStyleTransaction> transaction =
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new ChangeStyleTransaction(aElement, aProperty, aValue, true);
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return transaction.forget();
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}
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ChangeStyleTransaction::ChangeStyleTransaction(Element& aElement,
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nsAtom& aProperty,
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const nsAString& aValue,
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bool aRemove)
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: EditTransactionBase(),
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mElement(&aElement),
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mProperty(&aProperty),
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mValue(aValue),
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mRemoveProperty(aRemove),
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mUndoValue(),
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mRedoValue(),
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mUndoAttributeWasSet(false),
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mRedoAttributeWasSet(false) {}
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#define kNullCh (char16_t('\0'))
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NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeStyleTransaction, EditTransactionBase,
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mElement)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeStyleTransaction)
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NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
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NS_IMPL_ADDREF_INHERITED(ChangeStyleTransaction, EditTransactionBase)
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NS_IMPL_RELEASE_INHERITED(ChangeStyleTransaction, EditTransactionBase)
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ChangeStyleTransaction::~ChangeStyleTransaction() {}
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// Answers true if aValue is in the string list of white-space separated values
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// aValueList.
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bool ChangeStyleTransaction::ValueIncludes(const nsAString& aValueList,
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const nsAString& aValue) {
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nsAutoString valueList(aValueList);
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bool result = false;
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// put an extra null at the end
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valueList.Append(kNullCh);
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char16_t* value = ToNewUnicode(aValue);
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char16_t* start = valueList.BeginWriting();
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char16_t* end = start;
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while (kNullCh != *start) {
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while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
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// skip leading space
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start++;
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}
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end = start;
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while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
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// look for space or end
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end++;
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}
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// end string here
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*end = kNullCh;
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if (start < end) {
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if (nsDependentString(value).Equals(
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nsDependentString(start), nsCaseInsensitiveStringComparator())) {
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result = true;
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break;
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}
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}
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start = ++end;
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}
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free(value);
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return result;
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}
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// Removes the value aRemoveValue from the string list of white-space separated
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// values aValueList
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void ChangeStyleTransaction::RemoveValueFromListOfValues(
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nsAString& aValues, const nsAString& aRemoveValue) {
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nsAutoString classStr(aValues);
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nsAutoString outString;
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// put an extra null at the end
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classStr.Append(kNullCh);
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char16_t* start = classStr.BeginWriting();
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char16_t* end = start;
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while (kNullCh != *start) {
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while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
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// skip leading space
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start++;
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}
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end = start;
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while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
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// look for space or end
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end++;
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}
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// end string here
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*end = kNullCh;
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if (start < end && !aRemoveValue.Equals(start)) {
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outString.Append(start);
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outString.Append(char16_t(' '));
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}
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start = ++end;
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}
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aValues.Assign(outString);
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}
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NS_IMETHODIMP
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ChangeStyleTransaction::DoTransaction() {
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nsCOMPtr<nsStyledElement> inlineStyles = do_QueryInterface(mElement);
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NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
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nsCOMPtr<nsICSSDeclaration> cssDecl = inlineStyles->Style();
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nsAutoString propertyNameString;
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mProperty->ToString(propertyNameString);
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mUndoAttributeWasSet = mElement->HasAttr(kNameSpaceID_None, nsGkAtoms::style);
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nsAutoString values;
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nsresult rv = cssDecl->GetPropertyValue(propertyNameString, values);
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NS_ENSURE_SUCCESS(rv, rv);
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mUndoValue.Assign(values);
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// Does this property accept more than one value? (bug 62682)
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bool multiple = AcceptsMoreThanOneValue(*mProperty);
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if (mRemoveProperty) {
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nsAutoString returnString;
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if (multiple) {
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// Let's remove only the value we have to remove and not the others
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// The two lines below are a workaround because
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// nsDOMCSSDeclaration::GetPropertyCSSValue is not yet implemented (bug
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// 62682)
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RemoveValueFromListOfValues(values, NS_LITERAL_STRING("none"));
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RemoveValueFromListOfValues(values, mValue);
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if (values.IsEmpty()) {
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rv = cssDecl->RemoveProperty(propertyNameString, returnString);
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NS_ENSURE_SUCCESS(rv, rv);
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} else {
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nsAutoString priority;
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cssDecl->GetPropertyPriority(propertyNameString, priority);
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rv = cssDecl->SetProperty(propertyNameString, values, priority);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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} else {
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rv = cssDecl->RemoveProperty(propertyNameString, returnString);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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} else {
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nsAutoString priority;
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cssDecl->GetPropertyPriority(propertyNameString, priority);
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if (multiple) {
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// Let's add the value we have to add to the others
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// The line below is a workaround because
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// nsDOMCSSDeclaration::GetPropertyCSSValue is not yet implemented (bug
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// 62682)
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AddValueToMultivalueProperty(values, mValue);
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} else {
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values.Assign(mValue);
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}
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rv = cssDecl->SetProperty(propertyNameString, values, priority);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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// Let's be sure we don't keep an empty style attribute
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uint32_t length = cssDecl->Length();
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if (!length) {
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rv = mElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
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NS_ENSURE_SUCCESS(rv, rv);
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} else {
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mRedoAttributeWasSet = true;
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}
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return cssDecl->GetPropertyValue(propertyNameString, mRedoValue);
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}
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nsresult ChangeStyleTransaction::SetStyle(bool aAttributeWasSet,
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nsAString& aValue) {
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if (aAttributeWasSet) {
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// The style attribute was not empty, let's recreate the declaration
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nsAutoString propertyNameString;
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mProperty->ToString(propertyNameString);
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nsCOMPtr<nsStyledElement> inlineStyles = do_QueryInterface(mElement);
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NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
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nsCOMPtr<nsICSSDeclaration> cssDecl = inlineStyles->Style();
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if (aValue.IsEmpty()) {
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// An empty value means we have to remove the property
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nsAutoString returnString;
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return cssDecl->RemoveProperty(propertyNameString, returnString);
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}
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// Let's recreate the declaration as it was
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nsAutoString priority;
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cssDecl->GetPropertyPriority(propertyNameString, priority);
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return cssDecl->SetProperty(propertyNameString, aValue, priority);
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}
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return mElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
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}
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NS_IMETHODIMP
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ChangeStyleTransaction::UndoTransaction() {
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return SetStyle(mUndoAttributeWasSet, mUndoValue);
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}
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NS_IMETHODIMP
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ChangeStyleTransaction::RedoTransaction() {
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return SetStyle(mRedoAttributeWasSet, mRedoValue);
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}
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// True if the CSS property accepts more than one value
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bool ChangeStyleTransaction::AcceptsMoreThanOneValue(nsAtom& aCSSProperty) {
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return &aCSSProperty == nsGkAtoms::text_decoration;
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}
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// Adds the value aNewValue to the list of white-space separated values aValues
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void ChangeStyleTransaction::AddValueToMultivalueProperty(
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nsAString& aValues, const nsAString& aNewValue) {
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if (aValues.IsEmpty() || aValues.LowerCaseEqualsLiteral("none")) {
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aValues.Assign(aNewValue);
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} else if (!ValueIncludes(aValues, aNewValue)) {
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// We already have another value but not this one; add it
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aValues.Append(char16_t(' '));
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aValues.Append(aNewValue);
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}
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}
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} // namespace mozilla
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