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nsDOMCSSDeclaration.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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00014  *
00015  * The Original Code is Mozilla Communicator client code.
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00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
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00024  * Alternatively, the contents of this file may be used under the terms of
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00037 #ifndef nsDOMCSSDeclaration_h___
00038 #define nsDOMCSSDeclaration_h___
00039 
00040 #include "nsICSSDeclaration.h"
00041 #include "nsIDOMCSS2Properties.h"
00042 
00043 class nsCSSDeclaration;
00044 class nsICSSParser;
00045 class nsICSSLoader;
00046 class nsIURI;
00047 
00048 class CSS2PropertiesTearoff : public nsIDOMNSCSS2Properties
00049 {
00050 public:
00051   NS_DECL_ISUPPORTS_INHERITED
00052 
00053   NS_DECL_NSIDOMCSS2PROPERTIES
00054   NS_DECL_NSIDOMNSCSS2PROPERTIES
00055 
00056   CSS2PropertiesTearoff(nsICSSDeclaration *aOuter);
00057   virtual ~CSS2PropertiesTearoff();
00058 
00059 private:
00060   nsICSSDeclaration* mOuter;
00061 };
00062 
00063 class nsDOMCSSDeclaration : public nsICSSDeclaration
00064 {
00065 public:
00066   nsDOMCSSDeclaration();
00067 
00068   // Only implement QueryInterface; subclasses have the responsibility
00069   // of implementing AddRef/Release.
00070   NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
00071 
00072   NS_DECL_NSICSSDECLARATION
00073 
00074   // Require subclasses to implement |GetParentRule|.
00075   //NS_DECL_NSIDOMCSSSTYLEDECLARATION
00076   NS_IMETHOD GetCssText(nsAString & aCssText);
00077   NS_IMETHOD SetCssText(const nsAString & aCssText);
00078   NS_IMETHOD GetPropertyValue(const nsAString & propertyName,
00079                               nsAString & _retval);
00080   NS_IMETHOD GetPropertyCSSValue(const nsAString & propertyName,
00081                                  nsIDOMCSSValue **_retval);
00082   NS_IMETHOD RemoveProperty(const nsAString & propertyName,
00083                             nsAString & _retval);
00084   NS_IMETHOD GetPropertyPriority(const nsAString & propertyName,
00085                                  nsAString & _retval);
00086   NS_IMETHOD SetProperty(const nsAString & propertyName,
00087                          const nsAString & value, const nsAString & priority);
00088   NS_IMETHOD GetLength(PRUint32 *aLength);
00089   NS_IMETHOD Item(PRUint32 index, nsAString & _retval);
00090   NS_IMETHOD GetParentRule(nsIDOMCSSRule * *aParentRule) = 0; 
00091 
00092   virtual void DropReference() = 0;
00093 protected:
00094   // Always fills in the out parameter, even on failure, and if the out
00095   // parameter is null the nsresult will be the correct thing to
00096   // propagate.
00097   virtual nsresult GetCSSDeclaration(nsCSSDeclaration **aDecl,
00098                                      PRBool aAllocate) = 0;
00099   virtual nsresult DeclarationChanged() = 0;
00100   
00101   // This will only fail if it can't get a parser.  This means it can
00102   // return NS_OK without aURI or aCSSLoader being initialized.
00103   virtual nsresult GetCSSParsingEnvironment(nsIURI** aSheetURI,
00104                                             nsIURI** aBaseURI,
00105                                             nsICSSLoader** aCSSLoader,
00106                                             nsICSSParser** aCSSParser) = 0;
00107 
00108   nsresult ParsePropertyValue(const nsCSSProperty aPropID,
00109                               const nsAString& aPropValue);
00110   nsresult ParseDeclaration(const nsAString& aDecl,
00111                             PRBool aParseOnlyOneDecl, PRBool aClearOldDecl);
00112 
00113   // Prop-id based version of RemoveProperty.  Note that this does not
00114   // return the old value; it just does a straight removal.
00115   nsresult RemoveProperty(const nsCSSProperty aPropID);
00116   
00117   
00118 protected:
00119   virtual ~nsDOMCSSDeclaration();
00120 
00121 private:
00122   CSS2PropertiesTearoff mInner;
00123 };
00124 
00125 #endif // nsDOMCSSDeclaration_h___