gecko-dev/editor/libeditor/ChangeStyleTransaction.cpp

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