gecko-dev/layout/style/nsIStyleSheet.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is
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#ifndef nsIStyleSheet_h___
#define nsIStyleSheet_h___

#include <stdio.h>
#include "nsISupports.h"

class nsIAtom;
class nsString;
class nsIURI;
class nsIStyleRule;
class nsISupportsArray;
class nsPresContext;
class nsIContent;
class nsIDocument;
class nsIStyleRuleProcessor;

// IID for the nsIStyleSheet interface
// 6fbfb2cb-a1c0-4576-9354-a4af4e0029ad
#define NS_ISTYLE_SHEET_IID     \
{0x6fbfb2cb, 0xa1c0, 0x4576, {0x93, 0x54, 0xa4, 0xaf, 0x4e, 0x00, 0x29, 0xad}}

/**
 * A style sheet is a thing associated with a document that has style
 * rules.  Those style rules can be reached in one of two ways, depending
 * on which level of the nsStyleSet it is in:
 *   1) It can be |QueryInterface|d to nsIStyleRuleProcessor
 *   2) It can be |QueryInterface|d to nsICSSStyleSheet, with which the
 *      |nsStyleSet| uses an |nsCSSRuleProcessor| to access the rules.
 */
class nsIStyleSheet : public nsISupports {
public:
  NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISTYLE_SHEET_IID)

  // basic style sheet data
  NS_IMETHOD GetSheetURI(nsIURI** aSheetURI) const = 0;
  NS_IMETHOD GetBaseURI(nsIURI** aBaseURI) const = 0;
  NS_IMETHOD GetTitle(nsString& aTitle) const = 0;
  NS_IMETHOD GetType(nsString& aType) const = 0;
  NS_IMETHOD GetMediumCount(PRInt32& aCount) const = 0;
  NS_IMETHOD GetMediumAt(PRInt32 aIndex, nsIAtom*& aMedium) const = 0;
  NS_IMETHOD_(PRBool) UseForMedium(nsIAtom* aMedium) const = 0;
  NS_IMETHOD_(PRBool) HasRules() const = 0;

  /**
   * Whether the sheet is applicable.  A sheet that is not applicable
   * should never be inserted into a style set.  A sheet may not be
   * applicable for a variety of reasons including being disabled and
   * being incomplete.
   *
   */
  NS_IMETHOD GetApplicable(PRBool& aApplicable) const = 0;

  /**
   * Set the stylesheet to be enabled.  This may or may not make it
   * applicable.
   */
  NS_IMETHOD SetEnabled(PRBool aEnabled) = 0;

  /**
   * Whether the sheet is complete.
   */
  NS_IMETHOD GetComplete(PRBool& aComplete) const = 0;
  NS_IMETHOD SetComplete() = 0;

  // style sheet owner info
  NS_IMETHOD GetParentSheet(nsIStyleSheet*& aParent) const = 0;  // may be null
  NS_IMETHOD GetOwningDocument(nsIDocument*& aDocument) const = 0; // may be null
  NS_IMETHOD SetOwningDocument(nsIDocument* aDocument) = 0;

#ifdef DEBUG
  virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const = 0;
#endif
};

#endif /* nsIStyleSheet_h___ */