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nsStyleLinkElement.h

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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
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 * the Initial Developer. All Rights Reserved.
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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/*
 * A base class which implements nsIStyleSheetLinkingElement and can
 * be subclassed by various content nodes that want to load
 * stylesheets (<style>, <link>, processing instructions, etc).
 */

#ifndef nsStyleLinkElement_h___
#define nsStyleLinkElement_h___

#include "nsCOMPtr.h"
#include "nsIDOMLinkStyle.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIStyleSheet.h"
#include "nsIURI.h"

class nsIDocument;
class nsStringArray;

class nsStyleLinkElement : public nsIDOMLinkStyle,
                           public nsIStyleSheetLinkingElement
{
public:
  nsStyleLinkElement();
  virtual ~nsStyleLinkElement();

  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) = 0;

  // nsIDOMLinkStyle
  NS_DECL_NSIDOMLINKSTYLE

  // nsIStyleSheetLinkingElement  
  NS_IMETHOD SetStyleSheet(nsIStyleSheet* aStyleSheet);
  NS_IMETHOD GetStyleSheet(nsIStyleSheet*& aStyleSheet);
  NS_IMETHOD InitStyleLinkElement(PRBool aDontLoadStyle);
  NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
                              PRBool* aWillNotify,
                              PRBool* aIsAlternate);
  NS_IMETHOD SetEnableUpdates(PRBool aEnableUpdates);
  NS_IMETHOD GetCharset(nsAString& aCharset);

  virtual void OverrideBaseURI(nsIURI* aNewBaseURI);
  virtual void SetLineNumber(PRUint32 aLineNumber);

  static void ParseLinkTypes(const nsAString& aTypes, nsStringArray& aResult);

protected:
  /**
   * @param aOldDocument should be non-null only if we're updating because we
   *                     removed the node from the document.
   * @param aForceUpdate PR_TRUE will force the update even if the URI has not
   *                     changed.  This should be used in cases when something
   *                     about the content that affects the resulting sheet
   *                     changed but the URI may not have changed.
   */
  nsresult UpdateStyleSheetInternal(nsIDocument *aOldDocument,
                                    PRBool aForceUpdate = PR_FALSE);

  virtual void GetStyleSheetURL(PRBool* aIsInline,
                                nsIURI** aURI) = 0;
  virtual void GetStyleSheetInfo(nsAString& aTitle,
                                 nsAString& aType,
                                 nsAString& aMedia,
                                 PRBool* aIsAlternate) = 0;

private:
  /**
   * @param aOldDocument should be non-null only if we're updating because we
   *                     removed the node from the document.
   * @param aForceUpdate PR_TRUE will force the update even if the URI has not
   *                     changed.  This should be used in cases when something
   *                     about the content that affects the resulting sheet
   *                     changed but the URI may not have changed.
   */
  nsresult DoUpdateStyleSheet(nsIDocument *aOldDocument,
                              nsICSSLoaderObserver* aObserver,
                              PRBool* aWillNotify,
                              PRBool* aIsAlternate,
                              PRBool aForceUpdate);

protected:
  nsCOMPtr<nsIStyleSheet> mStyleSheet;
  PRPackedBool mDontLoadStyle;
  PRPackedBool mUpdatesEnabled;
  PRUint32 mLineNumber;
};

#endif /* nsStyleLinkElement_h___ */


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