gecko/layout/style/nsDOMCSSDeclaration.cpp

375 lines
12 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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):
* Mats Palmgren <mats.palmgren@bredband.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 MPL, 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 MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* base class for DOM objects for element.style and cssStyleRule.style */
#include "nsDOMCSSDeclaration.h"
#include "nsIDOMCSSRule.h"
#include "nsCSSParser.h"
#include "mozilla/css/Loader.h"
#include "nsCSSStyleSheet.h"
#include "nsIStyleRule.h"
#include "mozilla/css/Rule.h"
#include "mozilla/css/Declaration.h"
#include "nsCSSProps.h"
#include "nsCOMPtr.h"
#include "nsIURL.h"
#include "nsReadableUtils.h"
#include "nsIPrincipal.h"
#include "nsContentUtils.h"
#include "mozAutoDocUpdate.h"
namespace css = mozilla::css;
nsDOMCSSDeclaration::~nsDOMCSSDeclaration()
{
}
DOMCI_DATA(CSSStyleDeclaration, nsDOMCSSDeclaration)
NS_INTERFACE_TABLE_HEAD(nsDOMCSSDeclaration)
NS_INTERFACE_TABLE3(nsDOMCSSDeclaration,
nsICSSDeclaration,
nsIDOMCSSStyleDeclaration,
nsIDOMCSS2Properties)
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(CSSStyleDeclaration)
NS_INTERFACE_MAP_END
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsCSSProperty aPropID,
nsAString& aValue)
{
NS_PRECONDITION(aPropID != eCSSProperty_UNKNOWN,
"Should never pass eCSSProperty_UNKNOWN around");
css::Declaration* decl = GetCSSDeclaration(false);
aValue.Truncate();
if (decl) {
decl->GetValue(aPropID, aValue);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::SetPropertyValue(const nsCSSProperty aPropID,
const nsAString& aValue)
{
if (aValue.IsEmpty()) {
// If the new value of the property is an empty string we remove the
// property.
return RemoveProperty(aPropID);
}
return ParsePropertyValue(aPropID, aValue, false);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetCssText(nsAString& aCssText)
{
css::Declaration* decl = GetCSSDeclaration(false);
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.
css::Declaration* olddecl = GetCSSDeclaration(true);
if (!olddecl) {
return NS_ERROR_FAILURE;
}
CSSParsingEnvironment env;
GetCSSParsingEnvironment(env);
if (!env.mPrincipal) {
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);
nsAutoPtr<css::Declaration> decl(new css::Declaration());
decl->InitializeEmpty();
nsCSSParser cssParser(env.mCSSLoader);
bool changed;
nsresult result = cssParser.ParseDeclarations(aCssText, env.mSheetURI,
env.mBaseURI,
env.mPrincipal, decl, &changed);
if (NS_FAILED(result) || !changed) {
return result;
}
return SetCSSDeclaration(decl.forget());
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetLength(PRUint32* aLength)
{
css::Declaration* decl = GetCSSDeclaration(false);
if (decl) {
*aLength = decl->Count();
} else {
*aLength = 0;
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyCSSValue(const nsAString& aPropertyName,
nsIDOMCSSValue** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
// We don't support CSSValue yet so we'll just return null...
*aReturn = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::Item(PRUint32 aIndex, nsAString& aReturn)
{
css::Declaration* decl = GetCSSDeclaration(false);
aReturn.SetLength(0);
if (decl) {
decl->GetNthProperty(aIndex, aReturn);
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyValue(const nsAString& aPropertyName,
nsAString& aReturn)
{
const nsCSSProperty propID = nsCSSProps::LookupProperty(aPropertyName);
if (propID == eCSSProperty_UNKNOWN) {
aReturn.Truncate();
return NS_OK;
}
return GetPropertyValue(propID, aReturn);
}
NS_IMETHODIMP
nsDOMCSSDeclaration::GetPropertyPriority(const nsAString& aPropertyName,
nsAString& aReturn)
{
css::Declaration* decl = GetCSSDeclaration(false);
aReturn.Truncate();
if (decl && decl->GetValueIsImportant(aPropertyName)) {
aReturn.AssignLiteral("important");
}
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::SetProperty(const nsAString& aPropertyName,
const nsAString& aValue,
const nsAString& aPriority)
{
// In the common (and fast) cases we can use the property id
nsCSSProperty propID = nsCSSProps::LookupProperty(aPropertyName);
if (propID == eCSSProperty_UNKNOWN) {
return NS_OK;
}
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 RemoveProperty(propID);
}
if (aPriority.IsEmpty()) {
return ParsePropertyValue(propID, aValue, false);
}
if (aPriority.EqualsLiteral("important")) {
return ParsePropertyValue(propID, aValue, true);
}
// XXX silent failure?
return NS_OK;
}
NS_IMETHODIMP
nsDOMCSSDeclaration::RemoveProperty(const nsAString& aPropertyName,
nsAString& aReturn)
{
const nsCSSProperty propID = nsCSSProps::LookupProperty(aPropertyName);
if (propID == eCSSProperty_UNKNOWN) {
aReturn.Truncate();
return NS_OK;
}
nsresult rv = GetPropertyValue(propID, aReturn);
NS_ENSURE_SUCCESS(rv, rv);
return RemoveProperty(propID);
}
/* static */ void
nsDOMCSSDeclaration::GetCSSParsingEnvironmentForRule(css::Rule* aRule,
CSSParsingEnvironment& aCSSParseEnv)
{
nsIStyleSheet* sheet = aRule ? aRule->GetStyleSheet() : nsnull;
nsRefPtr<nsCSSStyleSheet> cssSheet(do_QueryObject(sheet));
if (!cssSheet) {
aCSSParseEnv.mPrincipal = nsnull;
return;
}
nsIDocument* document = sheet->GetOwningDocument();
aCSSParseEnv.mSheetURI = sheet->GetSheetURI();
aCSSParseEnv.mBaseURI = sheet->GetBaseURI();
aCSSParseEnv.mPrincipal = cssSheet->Principal();
aCSSParseEnv.mCSSLoader = document ? document->CSSLoader() : nsnull;
}
nsresult
nsDOMCSSDeclaration::ParsePropertyValue(const nsCSSProperty aPropID,
const nsAString& aPropValue,
bool aIsImportant)
{
css::Declaration* olddecl = GetCSSDeclaration(true);
if (!olddecl) {
return NS_ERROR_FAILURE;
}
CSSParsingEnvironment env;
GetCSSParsingEnvironment(env);
if (!env.mPrincipal) {
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);
css::Declaration* decl = olddecl->EnsureMutable();
nsCSSParser cssParser(env.mCSSLoader);
bool changed;
nsresult result = cssParser.ParseProperty(aPropID, aPropValue, env.mSheetURI,
env.mBaseURI, env.mPrincipal, decl,
&changed, aIsImportant);
if (NS_FAILED(result) || !changed) {
if (decl != olddecl) {
delete decl;
}
return result;
}
return SetCSSDeclaration(decl);
}
nsresult
nsDOMCSSDeclaration::RemoveProperty(const nsCSSProperty aPropID)
{
css::Declaration* decl = GetCSSDeclaration(false);
if (!decl) {
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);
decl = decl->EnsureMutable();
decl->RemoveProperty(aPropID);
return SetCSSDeclaration(decl);
}
// nsIDOMCSS2Properties
#define CSS_PROP_DOMPROP_PREFIXED(prop_) Moz ## prop_
#define CSS_PROP(name_, id_, method_, flags_, parsevariant_, kwtable_, \
stylestruct_, stylestructoffset_, animtype_) \
NS_IMETHODIMP \
nsDOMCSSDeclaration::Get##method_(nsAString& aValue) \
{ \
return GetPropertyValue(eCSSProperty_##id_, aValue); \
} \
\
NS_IMETHODIMP \
nsDOMCSSDeclaration::Set##method_(const nsAString& aValue) \
{ \
return SetPropertyValue(eCSSProperty_##id_, aValue); \
}
#define CSS_PROP_LIST_EXCLUDE_INTERNAL
#define CSS_PROP_SHORTHAND(name_, id_, method_, flags_) \
CSS_PROP(name_, id_, method_, flags_, X, X, X, X, X)
#include "nsCSSPropList.h"
#define CSS_PROP_ALIAS(aliasname_, propid_, aliasmethod_) \
CSS_PROP(X, propid_, aliasmethod_, X, X, X, X, X, X)
#include "nsCSSPropAliasList.h"
#undef CSS_PROP_ALIAS
#undef CSS_PROP_SHORTHAND
#undef CSS_PROP_LIST_EXCLUDE_INTERNAL
#undef CSS_PROP
#undef CSS_PROP_DOMPROP_PREFIXED