/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"
#include "domstubs.idl"

interface nsISelection;


/*
Editor Action Listener interface to outside world
*/


/**
 * A generic editor action listener interface. 
 * <P>
 * nsIEditActionListener is the interface used by applications wishing to be notified
 * when the editor modifies the DOM tree.
 *
 * Note:  this is the wrong class to implement if you are interested in generic
 * change notifications.  For generic notifications, you should implement
 * nsIDocumentObserver.
 */
[scriptable, uuid(b22907b1-ee93-11d2-8d50-000064657374)]

interface nsIEditActionListener : nsISupports{

  /** 
   * Called before the editor creates a node.
   * @param aTag      The tag name of the DOM Node to create.
   * @param aParent   The node to insert the new object into
   * @param aPosition The place in aParent to insert the new node
   *                  0=first child, 1=second child, etc.
   *                  any number > number of current children = last child
   */
  void WillCreateNode(in DOMString aTag,
                            in nsIDOMNode   aParent,
                            in long aPosition);

  /** 
   * Called after the editor creates a node.
   * @param aTag      The tag name of the DOM Node to create.
   * @param aNode     The DOM Node that was created.
   * @param aParent   The node to insert the new object into
   * @param aPosition The place in aParent to insert the new node
   *                  0=first child, 1=second child, etc.
   *                  any number > number of current children = last child
   * @param aResult   The result of the create node operation.
   */
  void DidCreateNode(in DOMString aTag,
                           in nsIDOMNode aNode,
                           in nsIDOMNode aParent,
                           in long          aPosition,
                           in nsresult      aResult);

  /** 
   * Called before the editor inserts a node.
   * @param aNode     The DOM Node to insert.
   * @param aParent   The node to insert the new object into
   * @param aPosition The place in aParent to insert the new node
   *                  0=first child, 1=second child, etc.
   *                  any number > number of current children = last child
   */
  void WillInsertNode(in nsIDOMNode aNode,
                            in nsIDOMNode aParent,
                            in long      aPosition);

  /** 
   * Called after the editor inserts a node.
   * @param aNode     The DOM Node to insert.
   * @param aParent   The node to insert the new object into
   * @param aPosition The place in aParent to insert the new node
   *                  0=first child, 1=second child, etc.
   *                  any number > number of current children = last child
   * @param aResult   The result of the insert node operation.
   */
  void DidInsertNode(in nsIDOMNode aNode,
                           in nsIDOMNode aParent,
                           in long      aPosition,
                           in nsresult    aResult);

  /** 
   * Called before the editor deletes a node.
   * @param aChild    The node to delete
   */
  void WillDeleteNode(in nsIDOMNode aChild);

  /** 
   * Called after the editor deletes a node.
   * @param aChild    The node to delete
   * @param aResult   The result of the delete node operation.
   */
  void DidDeleteNode(in nsIDOMNode aChild, in nsresult aResult);

  /** 
   * Called before the editor splits a node.
   * @param aExistingRightNode   the node to split.  It will become the new node's next sibling.
   * @param aOffset              the offset of aExistingRightNode's content|children to do the split at
   * @param aNewLeftNode         [OUT] the new node resulting from the split, becomes aExistingRightNode's previous sibling.
   */
  void WillSplitNode(in nsIDOMNode aExistingRightNode,
                           in long      aOffset);

  /** 
   * Called after the editor splits a node.
   * @param aExistingRightNode   the node to split.  It will become the new node's next sibling.
   * @param aOffset              the offset of aExistingRightNode's content|children to do the split at
   * @param aNewLeftNode         [OUT] the new node resulting from the split, becomes aExistingRightNode's previous sibling.
   */
  void DidSplitNode(in nsIDOMNode aExistingRightNode,
                          in long      aOffset,
                          in nsIDOMNode aNewLeftNode,
                          in nsresult    aResult);

  /** 
   * Called before the editor joins 2 nodes.
   * @param aLeftNode   This node will be merged into the right node
   * @param aRightNode  The node that will be merged into.
   *                    There is no requirement that the two nodes be of
   *                    the same type.
   * @param aParent     The parent of aRightNode
   */
  void WillJoinNodes(in nsIDOMNode aLeftNode,
                           in nsIDOMNode aRightNode,
                           in nsIDOMNode aParent);

  /** 
   * Called after the editor joins 2 nodes.
   * @param aLeftNode   This node will be merged into the right node
   * @param aRightNode  The node that will be merged into.
   *                    There is no requirement that the two nodes be of
   *                    the same type.
   * @param aParent     The parent of aRightNode
   * @param aResult     The result of the join operation.
   */
  void DidJoinNodes(in nsIDOMNode aLeftNode,
                          in nsIDOMNode aRightNode,
                          in nsIDOMNode aParent,
                          in nsresult    aResult);

  /** 
   * Called before the editor inserts text.
   * @param aTextNode   This node getting inserted text
   * @param aOffset     The offset in aTextNode to insert at.
   * @param aString     The string that gets inserted.
   */
  void WillInsertText(in nsIDOMCharacterData aTextNode,
                            in long          aOffset,
                            in DOMString     aString);

  /** 
   * Called after the editor inserts text.
   * @param aTextNode   This node getting inserted text
   * @param aOffset     The offset in aTextNode to insert at.
   * @param aString     The string that gets inserted.
   * @param aResult     The result of the insert text operation.
   */
  void DidInsertText(in nsIDOMCharacterData aTextNode,
                           in long                aOffset,
                           in DOMString           aString,
                           in nsresult            aResult);

  /** 
   * Called before the editor deletes text.
   * @param aTextNode   This node getting text deleted
   * @param aOffset     The offset in aTextNode to delete at.
   * @param aLength     The amount of text to delete.
   */
  void WillDeleteText(in nsIDOMCharacterData aTextNode,
                            in long                aOffset,
                            in long                aLength);

  /** 
   * Called before the editor deletes text.
   * @param aTextNode   This node getting text deleted
   * @param aOffset     The offset in aTextNode to delete at.
   * @param aLength     The amount of text to delete.
   * @param aResult     The result of the delete text operation.
   */
  void DidDeleteText(in nsIDOMCharacterData aTextNode,
                           in long                aOffset,
                           in long                aLength,
                           in nsresult              aResult);

  /** 
   * Called before the editor deletes the selection.
   * @param aSelection   The selection to be deleted
   */
  void WillDeleteSelection(in nsISelection aSelection);

  /** 
   * Called after the editor deletes the selection.
   * @param aSelection   The selection, after deletion
   */
  void DidDeleteSelection(in nsISelection aSelection);
};