gecko-dev/layout/style/nsDOMCSSDeclaration.h

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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/. */
/* base class for DOM objects for element.style and cssStyleRule.style */
#ifndef nsDOMCSSDeclaration_h___
#define nsDOMCSSDeclaration_h___
#include "nsICSSDeclaration.h"
#include "nsIDOMCSS2Properties.h"
#include "nsCOMPtr.h"
class nsCSSParser;
class nsIURI;
class nsIPrincipal;
class nsIDocument;
namespace mozilla {
namespace css {
class Declaration;
class Loader;
class Rule;
}
}
class nsDOMCSSDeclaration : public nsICSSDeclaration,
public nsIDOMCSS2Properties
{
public:
// Only implement QueryInterface; subclasses have the responsibility
// of implementing AddRef/Release.
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_DECL_NSICSSDECLARATION
// Require subclasses to implement |GetParentRule|.
//NS_DECL_NSIDOMCSSSTYLEDECLARATION
NS_IMETHOD GetCssText(nsAString & aCssText);
NS_IMETHOD SetCssText(const nsAString & aCssText);
NS_IMETHOD GetPropertyValue(const nsAString & propertyName,
nsAString & _retval);
NS_IMETHOD GetPropertyCSSValue(const nsAString & propertyName,
nsIDOMCSSValue **_retval);
NS_IMETHOD RemoveProperty(const nsAString & propertyName,
nsAString & _retval);
NS_IMETHOD GetPropertyPriority(const nsAString & propertyName,
nsAString & _retval);
NS_IMETHOD SetProperty(const nsAString & propertyName,
const nsAString & value, const nsAString & priority);
NS_IMETHOD GetLength(PRUint32 *aLength);
NS_IMETHOD Item(PRUint32 index, nsAString & _retval);
NS_IMETHOD GetParentRule(nsIDOMCSSRule * *aParentRule) = 0;
// We implement this as a shim which forwards to GetPropertyValue
// and SetPropertyValue; subclasses need not.
NS_DECL_NSIDOMCSS2PROPERTIES
protected:
// This method can return null regardless of the value of aAllocate;
// however, a null return should only be considered a failure
// if aAllocate is true.
virtual mozilla::css::Declaration* GetCSSDeclaration(bool aAllocate) = 0;
virtual nsresult SetCSSDeclaration(mozilla::css::Declaration* aDecl) = 0;
// Document that we must call BeginUpdate/EndUpdate on around the
// calls to SetCSSDeclaration and the style rule mutation that leads
// to it.
virtual nsIDocument* DocToUpdate() = 0;
// Information neded to parse a declaration. We need the mSheetURI
// for error reporting, mBaseURI to resolve relative URIs,
// mPrincipal for subresource loads, and mCSSLoader for determining
// whether we're in quirks mode. mBaseURI needs to be a strong
// pointer because of xml:base possibly creating base URIs on the
// fly. This is why we don't use CSSParsingEnvironment as a return
// value, to avoid multiple-refcounting of mBaseURI.
struct CSSParsingEnvironment {
nsIURI* mSheetURI;
nsCOMPtr<nsIURI> mBaseURI;
nsIPrincipal* mPrincipal;
mozilla::css::Loader* mCSSLoader;
};
// On failure, mPrincipal should be set to null in aCSSParseEnv.
// If mPrincipal is null, the other members may not be set to
// anything meaningful.
virtual void GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv) = 0;
// An implementation for GetCSSParsingEnvironment for callers wrapping
// an css::Rule.
static void GetCSSParsingEnvironmentForRule(mozilla::css::Rule* aRule,
CSSParsingEnvironment& aCSSParseEnv);
nsresult ParsePropertyValue(const nsCSSProperty aPropID,
const nsAString& aPropValue,
bool aIsImportant);
// Prop-id based version of RemoveProperty. Note that this does not
// return the old value; it just does a straight removal.
nsresult RemoveProperty(const nsCSSProperty aPropID);
protected:
virtual ~nsDOMCSSDeclaration();
};
#endif // nsDOMCSSDeclaration_h___