gecko-dev/layout/style/nsDOMCSSAttrDeclaration.cpp

373 строки
11 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsDOMCSSAttrDeclaration.h"
#include "nsCSSDeclaration.h"
#include "nsIDocument.h"
#include "nsHTMLAtoms.h"
#include "nsIHTMLContent.h"
#include "nsIDOMMutationEvent.h"
#include "nsHTMLValue.h"
#include "nsICSSStyleRule.h"
#include "nsINodeInfo.h"
#include "nsICSSLoader.h"
#include "nsICSSParser.h"
#include "nsIURI.h"
#include "nsINameSpaceManager.h"
#include "nsIHTMLContentContainer.h"
#include "nsStyleConsts.h"
MOZ_DECL_CTOR_COUNTER(nsDOMCSSAttributeDeclaration)
nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(nsIHTMLContent *aContent)
{
MOZ_COUNT_CTOR(nsDOMCSSAttributeDeclaration);
// This reference is not reference-counted. The content
// object tells us when its about to go away.
mContent = aContent;
}
nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration()
{
MOZ_COUNT_DTOR(nsDOMCSSAttributeDeclaration);
}
NS_IMETHODIMP
nsDOMCSSAttributeDeclaration::RemoveProperty(const nsAString& aPropertyName,
nsAString& aReturn)
{
nsCSSDeclaration* decl;
nsresult rv = GetCSSDeclaration(&decl, PR_TRUE);
if (NS_SUCCEEDED(rv) && decl && mContent) {
nsCOMPtr<nsIDocument> doc;
mContent->GetDocument(*getter_AddRefs(doc));
if (doc) {
doc->BeginUpdate();
doc->AttributeWillChange(mContent, kNameSpaceID_None,
nsHTMLAtoms::style);
}
nsChangeHint hint = NS_STYLE_HINT_NONE;
nsCSSProperty prop = nsCSSProps::LookupProperty(aPropertyName);
nsCSSValue val;
rv = decl->RemoveProperty(prop, val);
if (NS_SUCCEEDED(rv)) {
// We pass in eCSSProperty_UNKNOWN here so that we don't get the
// property name in the return string.
val.ToString(aReturn, eCSSProperty_UNKNOWN);
hint = nsCSSProps::kHintTable[prop];
} else {
// If we tried to remove an invalid property or a property that wasn't
// set we simply return success and an empty string
rv = NS_OK;
}
if (doc) {
doc->AttributeChanged(mContent, kNameSpaceID_None, nsHTMLAtoms::style,
nsIDOMMutationEvent::MODIFICATION,
hint);
doc->EndUpdate();
}
}
return rv;
}
void
nsDOMCSSAttributeDeclaration::DropReference()
{
mContent = nsnull;
}
nsresult
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(nsCSSDeclaration **aDecl,
PRBool aAllocate)
{
nsresult result = NS_OK;
*aDecl = nsnull;
if (mContent) {
nsHTMLValue val;
mContent->GetHTMLAttribute(nsHTMLAtoms::style, val);
if (eHTMLUnit_ISupports == val.GetUnit()) {
nsCOMPtr<nsISupports> rule = val.GetISupportsValue();
nsCOMPtr<nsICSSStyleRule> cssRule = do_QueryInterface(rule, &result);
if (cssRule) {
*aDecl = cssRule->GetDeclaration();
}
}
else if (aAllocate) {
result = NS_NewCSSDeclaration(aDecl);
if (NS_OK == result) {
nsCOMPtr<nsICSSStyleRule> cssRule;
result = NS_NewCSSStyleRule(getter_AddRefs(cssRule), nsCSSSelector());
if (NS_OK == result) {
cssRule->SetDeclaration(*aDecl);
cssRule->SetWeight(0x7fffffff);
result = mContent->SetHTMLAttribute(nsHTMLAtoms::style,
nsHTMLValue(cssRule),
PR_FALSE);
}
else {
(*aDecl)->RuleAbort();
*aDecl = nsnull;
}
}
}
}
return result;
}
nsresult
nsDOMCSSAttributeDeclaration::SetCSSDeclaration(nsCSSDeclaration *aDecl)
{
nsresult result = NS_OK;
if (mContent) {
nsHTMLValue val;
mContent->GetHTMLAttribute(nsHTMLAtoms::style, val);
if (eHTMLUnit_ISupports == val.GetUnit()) {
nsCOMPtr<nsISupports> rule = val.GetISupportsValue();
nsCOMPtr<nsICSSStyleRule> cssRule = do_QueryInterface(rule, &result);
if (cssRule) {
cssRule->SetDeclaration(aDecl);
}
}
}
return result;
}
/*
* This is a utility function. It will only fail if it can't get a
* parser. This means it can return NS_OK without aURI or aCSSLoader
* being initialized
*/
nsresult
nsDOMCSSAttributeDeclaration::GetCSSParsingEnvironment(nsIContent* aContent,
nsIURI** aBaseURI,
nsICSSLoader** aCSSLoader,
nsICSSParser** aCSSParser)
{
NS_ASSERTION(aContent, "Something is severely broken -- there should be an nsIContent here!");
// null out the out params since some of them may not get initialized below
*aBaseURI = nsnull;
*aCSSLoader = nsnull;
*aCSSParser = nsnull;
nsCOMPtr<nsINodeInfo> nodeInfo;
nsresult result = aContent->GetNodeInfo(*getter_AddRefs(nodeInfo));
if (NS_FAILED(result)) {
return result;
}
nsCOMPtr<nsIDocument> doc;
result = nodeInfo->GetDocument(*getter_AddRefs(doc));
if (NS_FAILED(result)) {
return result;
}
if (doc) {
doc->GetBaseURL(*aBaseURI);
nsCOMPtr<nsIHTMLContentContainer> htmlContainer(do_QueryInterface(doc));
if (htmlContainer) {
htmlContainer->GetCSSLoader(*aCSSLoader);
}
NS_ASSERTION(*aCSSLoader, "Document with no CSS loader!");
}
if (*aCSSLoader) {
result = (*aCSSLoader)->GetParserFor(nsnull, aCSSParser);
} else {
result = NS_NewCSSParser(aCSSParser);
}
if (NS_FAILED(result)) {
return result;
}
// look up our namespace. If we're XHTML, we need to be case-sensitive
// Otherwise, we should not be
(*aCSSParser)->SetCaseSensitive(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML));
return NS_OK;
}
nsresult
nsDOMCSSAttributeDeclaration::ParsePropertyValue(const nsAString& aPropName,
const nsAString& aPropValue)
{
nsCSSDeclaration* decl;
nsresult result = GetCSSDeclaration(&decl, PR_TRUE);
if (!decl) {
return result;
}
nsCOMPtr<nsICSSLoader> cssLoader;
nsCOMPtr<nsICSSParser> cssParser;
nsCOMPtr<nsIURI> baseURI;
nsCOMPtr<nsIDocument> doc;
result = mContent->GetDocument(*getter_AddRefs(doc));
if (NS_FAILED(result)) {
return result;
}
result = GetCSSParsingEnvironment(mContent,
getter_AddRefs(baseURI),
getter_AddRefs(cssLoader),
getter_AddRefs(cssParser));
if (NS_FAILED(result)) {
return result;
}
nsChangeHint hint = NS_STYLE_HINT_NONE;
if (doc) {
doc->BeginUpdate();
doc->AttributeWillChange(mContent, kNameSpaceID_None, nsHTMLAtoms::style);
}
result = cssParser->ParseProperty(aPropName, aPropValue, baseURI, decl, &hint);
if (doc) {
doc->AttributeChanged(mContent, kNameSpaceID_None, nsHTMLAtoms::style,
nsIDOMMutationEvent::MODIFICATION, hint);
doc->EndUpdate();
}
if (cssLoader) {
cssLoader->RecycleParser(cssParser);
}
return NS_OK;
}
nsresult
nsDOMCSSAttributeDeclaration::ParseDeclaration(const nsAString& aDecl,
PRBool aParseOnlyOneDecl,
PRBool aClearOldDecl)
{
nsCSSDeclaration* decl;
nsresult result = GetCSSDeclaration(&decl, PR_TRUE);
if (decl) {
nsCOMPtr<nsICSSLoader> cssLoader;
nsCOMPtr<nsICSSParser> cssParser;
nsCOMPtr<nsIURI> baseURI;
nsCOMPtr<nsIDocument> doc;
result = mContent->GetDocument(*getter_AddRefs(doc));
if (NS_FAILED(result)) {
return result;
}
result = GetCSSParsingEnvironment(mContent,
getter_AddRefs(baseURI),
getter_AddRefs(cssLoader),
getter_AddRefs(cssParser));
if (NS_SUCCEEDED(result)) {
nsChangeHint hint = NS_STYLE_HINT_NONE;
if (doc) {
doc->BeginUpdate();
doc->AttributeWillChange(mContent, kNameSpaceID_None,
nsHTMLAtoms::style);
}
nsCSSDeclaration* declClone = decl->Clone();
if (aClearOldDecl) {
hint = decl->GetStyleImpact();
// This should be done with decl->Clear() once such a method exists.
nsAutoString propName;
PRUint32 count, i;
count = decl->Count();
for (i = 0; i < count; i++) {
decl->GetNthProperty(0, propName);
nsCSSProperty prop = nsCSSProps::LookupProperty(propName);
nsCSSValue val;
decl->RemoveProperty(prop, val);
}
}
nsChangeHint newHint = NS_STYLE_HINT_NONE;
result = cssParser->ParseAndAppendDeclaration(aDecl, baseURI, decl,
aParseOnlyOneDecl, &newHint);
NS_UpdateHint(hint, newHint);
if (result == NS_CSS_PARSER_DROP_DECLARATION) {
SetCSSDeclaration(declClone);
result = NS_OK;
}
if (doc) {
if (NS_SUCCEEDED(result) && result != NS_CSS_PARSER_DROP_DECLARATION) {
doc->AttributeChanged(mContent, kNameSpaceID_None,
nsHTMLAtoms::style,
nsIDOMMutationEvent::MODIFICATION, hint);
}
doc->EndUpdate();
}
if (cssLoader) {
cssLoader->RecycleParser(cssParser);
}
}
}
return result;
}
nsresult
nsDOMCSSAttributeDeclaration::GetParent(nsISupports **aParent)
{
NS_ENSURE_ARG_POINTER(aParent);
*aParent = mContent;
NS_IF_ADDREF(*aParent);
return NS_OK;
}