/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */
#ifndef nsIFrameDebug_h___
#define nsIFrameDebug_h___

#include "nslayout.h"
#include "nsISupports.h"

class nsIFrame;
class nsIPresContext;

// IID for the nsIFrameDebug interface {a6cf9069-15b3-11d2-932e-00805f8add32}
#define NS_IFRAMEDEBUG_IID         \
{ 0xa6cf9069, 0x15b3, 0x11d2, \
  {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
 
/**
 * Debug related functions
 */
class nsIFrameDebug : public nsISupports {
public:
  static const nsIID& GetIID() { static nsIID iid = NS_IFRAMEDEBUG_IID; return iid; }
  
  NS_IMETHOD  List(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) const = 0;
  
  /**
   * Get a printable from of the name of the frame type.
   * XXX This should be eliminated and we use GetFrameType() instead...
   */
  NS_IMETHOD  GetFrameName(nsString& aResult) const = 0;
  /**
   * Called to dump out regression data that describes the layout
   * of the frame and it's children, and so on. The format of the
   * data is dictated to be XML (using a specific DTD); the
   * specific kind of data dumped is up to the frame itself, with
   * the caveat that some base types are defined.
   * For more information, see XXX.
   */
  NS_IMETHOD  DumpRegressionData(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent) = 0;

  /**
   * Get the size of the frame object. The size value should include
   * all subordinate data referenced by the frame that is not
   * accounted for by child frames. However, this value should not
   * include the content objects, style contexts, views or other data
   * that lies logically outside the frame system.
   *
   * If the implementation so chooses, instead of returning the total
   * subordinate data it may instead use the sizeof handler to store
   * away subordinate data under its own key so that the subordinate
   * data may be tabulated independently of the frame itself.
   *
   * The caller is responsible for recursing over all child-lists that
   * the frame supports.
   */
  NS_IMETHOD  SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const = 0;

  NS_IMETHOD  VerifyTree() const = 0;

  /**
   * See if tree verification is enabled. To enable tree verification add
   * "frameverifytree:1" to your NSPR_LOG_MODULES environment variable
   * (any non-zero debug level will work). Or, call SetVerifyTreeEnable
   * with PR_TRUE.
   */
  static NS_LAYOUT PRBool GetVerifyTreeEnable();

  /**
   * Set the verify-tree enable flag.
   */
  static NS_LAYOUT void SetVerifyTreeEnable(PRBool aEnabled);

  /**
   * See if style tree verification is enabled. To enable style tree 
   * verification add "styleverifytree:1" to your NSPR_LOG_MODULES 
   * environment variable (any non-zero debug level will work). Or, 
   * call SetVerifyStyleTreeEnable with PR_TRUE.
   */
  static NS_LAYOUT PRBool GetVerifyStyleTreeEnable();

  /**
   * Set the verify-style-tree enable flag.
   */
  static NS_LAYOUT void SetVerifyStyleTreeEnable(PRBool aEnabled);

  /**
   * The frame class and related classes share an nspr log module
   * for logging frame activity.
   *
   * Note: the log module is created during library initialization which
   * means that you cannot perform logging before then.
   */
  static NS_LAYOUT PRLogModuleInfo* GetLogModuleInfo();

  // Show frame borders when rendering
  static NS_LAYOUT void ShowFrameBorders(PRBool aEnable);
  static NS_LAYOUT PRBool GetShowFrameBorders();

  // Show frame border of event target
  static NS_LAYOUT void ShowEventTargetFrameBorder(PRBool aEnable);
  static NS_LAYOUT PRBool GetShowEventTargetFrameBorder();

private:
  NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
  NS_IMETHOD_(nsrefcnt) Release(void) = 0;
};

#endif /* nsIFrameDebug_h___ */