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#ifndef nsIEditorStyleSheets_h__
#define nsIEditorStyleSheets_h__


#include "nsISupports.h"

class nsString;
class nsICSSStyleSheet;

#define NS_IEDITORSTYLESHEETS_IID                  \
{ /* 4805e682-49b9-11d3-9ce4-ed60bd6cb5bc} */      \
0x4805e682, 0x49b9, 0x11d3,                        \
{ 0x9c, 0xe4, 0xed, 0x60, 0xbd, 0x6c, 0xb5, 0xbc } }


class nsIEditorStyleSheets : public nsISupports
{
public:
  static const nsIID& GetIID() { static nsIID iid = NS_IEDITORSTYLESHEETS_IID; return iid; }

  /** load and apply the style sheet, specified by aURL, to
    * the editor's document. This can involve asynchronous
    * network I/O
    * @param aURL         The style sheet to be loaded and applied.
    * @param aStyleSheet  Optional: if not null, return the style sheet created from aURL
    */
  NS_IMETHOD ApplyStyleSheet(const nsAReadableString& aURL, nsICSSStyleSheet **aStyleSheet)=0;

  /** load and apply an Override style sheet, specified by aURL, to
    * the editor's document. 
    * IMPORTANT: This is assumed to be synchronous:
    *            URL is a local file with no @import used
    * This action is not undoable.
    * It is not intended for use by "user", only editor developers
    *   to change display behavior for editing (like showing special cursors)
    *   that will not be affected by loading other "document" style sheets
    *   loaded using ApplyStyleSheet.
    *
    * @param aURL         The style sheet to be loaded and applied.
    * @param aStyleSheet  Optional: if not null, return the style sheet created from aURL
    */
  NS_IMETHOD ApplyOverrideStyleSheet(const nsAReadableString& aURL, nsICSSStyleSheet **aStyleSheet)=0;

  /** Add the given Style Sheet to the editor's document
    * This is always synchronous
    * @param aSheet  The style sheet to be  applied.
    */
  NS_IMETHOD AddStyleSheet(nsICSSStyleSheet* aSheet)=0;

  /** Remove the given Style Sheet from the editor's document
    * This is always synchronous
    * @param aSheet  The style sheet to be removed
    */
  NS_IMETHOD RemoveStyleSheet(nsICSSStyleSheet* aSheet)=0;

  /** Remove the given Override Style Sheet from the editor's document
    * This is always synchronous
    * @param aSheet  The style sheet to be removed.
    */
  NS_IMETHOD RemoveOverrideStyleSheet(nsICSSStyleSheet* aSheet)=0;

};


#endif // nsIEditorStyleSheets_h__