gecko/editor/libeditor/base/ChangeCSSInlineStyleTxn.cpp
2012-05-21 12:12:37 +01:00

315 lines
10 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/. */
#include "ChangeCSSInlineStyleTxn.h"
#include "nsIDOMElement.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsIDOMElementCSSInlineStyle.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "nsGkAtoms.h"
#define kNullCh (PRUnichar('\0'))
NS_IMPL_CYCLE_COLLECTION_CLASS(ChangeCSSInlineStyleTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ChangeCSSInlineStyleTxn,
EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ChangeCSSInlineStyleTxn,
EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeCSSInlineStyleTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
// answers true if aValue is in the string list of white-space separated values aValueList
// a case-sensitive search is performed if aCaseSensitive is true
bool
ChangeCSSInlineStyleTxn::ValueIncludes(const nsAString &aValueList, const nsAString &aValue, bool aCaseSensitive)
{
nsAutoString valueList(aValueList);
bool result = false;
valueList.Append(kNullCh); // put an extra null at the end
PRUnichar *value = ToNewUnicode(aValue);
PRUnichar *start = valueList.BeginWriting();
PRUnichar *end = start;
while (kNullCh != *start) {
while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) { // skip leading space
start++;
}
end = start;
while ((kNullCh != *end) && (false == nsCRT::IsAsciiSpace(*end))) { // look for space or end
end++;
}
*end = kNullCh; // end string here
if (start < end) {
if (aCaseSensitive) {
if (!nsCRT::strcmp(value, start)) {
result = true;
break;
}
}
else {
if (nsDependentString(value).Equals(nsDependentString(start),
nsCaseInsensitiveStringComparator())) {
result = true;
break;
}
}
}
start = ++end;
}
NS_Free(value);
return result;
}
// removes the value aRemoveValue from the string list of white-space separated values aValueList
void
ChangeCSSInlineStyleTxn::RemoveValueFromListOfValues(nsAString & aValues, const nsAString & aRemoveValue)
{
nsAutoString classStr(aValues); // copy to work buffer nsAutoString rv(aRemoveValue);
nsAutoString outString;
classStr.Append(kNullCh); // put an extra null at the end
PRUnichar *start = classStr.BeginWriting();
PRUnichar *end = start;
while (kNullCh != *start) {
while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*start)) { // skip leading space
start++;
}
end = start;
while ((kNullCh != *end) && (false == nsCRT::IsAsciiSpace(*end))) { // look for space or end
end++;
}
*end = kNullCh; // end string here
if (start < end) {
if (!aRemoveValue.Equals(start)) {
outString.Append(start);
outString.Append(PRUnichar(' '));
}
}
start = ++end;
}
aValues.Assign(outString);
}
ChangeCSSInlineStyleTxn::ChangeCSSInlineStyleTxn()
: EditTxn()
{
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::Init(nsIEditor *aEditor,
nsIDOMElement *aElement,
nsIAtom *aProperty,
const nsAString& aValue,
bool aRemoveProperty)
{
NS_ASSERTION(aEditor && aElement, "bad arg");
if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mElement = do_QueryInterface(aElement);
mProperty = aProperty;
NS_ADDREF(mProperty);
mValue.Assign(aValue);
mRemoveProperty = aRemoveProperty;
mUndoAttributeWasSet = false;
mRedoAttributeWasSet = false;
mUndoValue.Truncate();
mRedoValue.Truncate();
return NS_OK;
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::DoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsCOMPtr<nsIDOMElementCSSInlineStyle> inlineStyles = do_QueryInterface(mElement);
NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
nsresult result = inlineStyles->GetStyle(getter_AddRefs(cssDecl));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(cssDecl, NS_ERROR_NULL_POINTER);
nsAutoString propertyNameString;
mProperty->ToString(propertyNameString);
NS_NAMED_LITERAL_STRING(styleAttr, "style");
result = mElement->HasAttribute(styleAttr, &mUndoAttributeWasSet);
NS_ENSURE_SUCCESS(result, result);
nsAutoString values;
result = cssDecl->GetPropertyValue(propertyNameString, values);
NS_ENSURE_SUCCESS(result, result);
mUndoValue.Assign(values);
// does this property accept more than 1 value ?
// we need to know that because of bug 62682
bool multiple = AcceptsMoreThanOneValue(mProperty);
if (mRemoveProperty) {
nsAutoString returnString;
if (multiple) {
// the property can have more than one value, let's remove only
// the value we have to remove and not the others
// the 2 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()) {
result = cssDecl->RemoveProperty(propertyNameString, returnString);
NS_ENSURE_SUCCESS(result, result);
}
else {
nsAutoString priority;
result = cssDecl->GetPropertyPriority(propertyNameString, priority);
NS_ENSURE_SUCCESS(result, result);
result = cssDecl->SetProperty(propertyNameString, values,
priority);
NS_ENSURE_SUCCESS(result, result);
}
}
else {
result = cssDecl->RemoveProperty(propertyNameString, returnString);
NS_ENSURE_SUCCESS(result, result);
}
}
else {
nsAutoString priority;
result = cssDecl->GetPropertyPriority(propertyNameString, priority);
NS_ENSURE_SUCCESS(result, result);
if (multiple) {
// the property can have more than one value, 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);
result = cssDecl->SetProperty(propertyNameString, values,
priority);
NS_ENSURE_SUCCESS(result, result);
}
// let's be sure we don't keep an empty style attribute
PRUint32 length;
result = cssDecl->GetLength(&length);
NS_ENSURE_SUCCESS(result, result);
if (!length) {
result = mElement->RemoveAttribute(styleAttr);
NS_ENSURE_SUCCESS(result, result);
}
else
mRedoAttributeWasSet = true;
return cssDecl->GetPropertyValue(propertyNameString, mRedoValue);
}
nsresult ChangeCSSInlineStyleTxn::SetStyle(bool aAttributeWasSet,
nsAString & aValue)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result = NS_OK;
if (aAttributeWasSet) {
// the style attribute was set and not empty, let's recreate the declaration
nsAutoString propertyNameString;
mProperty->ToString(propertyNameString);
nsCOMPtr<nsIDOMElementCSSInlineStyle> inlineStyles = do_QueryInterface(mElement);
NS_ENSURE_TRUE(inlineStyles, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
result = inlineStyles->GetStyle(getter_AddRefs(cssDecl));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(cssDecl, NS_ERROR_NULL_POINTER);
if (aValue.IsEmpty()) {
// an empty value means we have to remove the property
nsAutoString returnString;
result = cssDecl->RemoveProperty(propertyNameString, returnString);
}
else {
// let's recreate the declaration as it was
nsAutoString priority;
result = cssDecl->GetPropertyPriority(propertyNameString, priority);
NS_ENSURE_SUCCESS(result, result);
result = cssDecl->SetProperty(propertyNameString, aValue, priority);
}
}
else
result = mElement->RemoveAttribute(NS_LITERAL_STRING("style"));
return result;
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::UndoTransaction(void)
{
return SetStyle(mUndoAttributeWasSet, mUndoValue);
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::RedoTransaction(void)
{
return SetStyle(mRedoAttributeWasSet, mRedoValue);
}
NS_IMETHODIMP ChangeCSSInlineStyleTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("ChangeCSSInlineStyleTxn: [mRemoveProperty == ");
if (!mRemoveProperty)
aString.AppendLiteral("false] ");
else
aString.AppendLiteral("true] ");
nsAutoString tempString;
mProperty->ToString(tempString);
aString += tempString;
return NS_OK;
}
// answers true if the CSS property accepts more than one value
bool
ChangeCSSInlineStyleTxn::AcceptsMoreThanOneValue(nsIAtom *aCSSProperty)
{
return aCSSProperty == nsGkAtoms::text_decoration;
}
// adds the value aNewValue to the list of white-space separated values aValues
NS_IMETHODIMP
ChangeCSSInlineStyleTxn::AddValueToMultivalueProperty(nsAString & aValues, const nsAString & aNewValue)
{
if (aValues.IsEmpty()
|| aValues.LowerCaseEqualsLiteral("none")) {
// the list of values is empty of the value is 'none'
aValues.Assign(aNewValue);
}
else if (!ValueIncludes(aValues, aNewValue, false)) {
// we already have another value but not this one; add it
aValues.Append(PRUnichar(' '));
aValues.Append(aNewValue);
}
return NS_OK;
}