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/*
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 * FCKeditor - The text editor for internet
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 * Copyright (C) 2003-2006 Frederico Caldeira Knabben
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 *
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 * Licensed under the terms of the GNU Lesser General Public License:
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 * 		http://www.opensource.org/licenses/lgpl-license.php
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 *
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 * For further information visit:
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 * 		http://www.fckeditor.net/
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 *
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 * "Support Open Source software. What about a donation today?"
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 *
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 * File Name: fckselection_ie.js
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 * 	Active selection functions. (IE specific implementation)
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 *
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 * File Authors:
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 * 		Frederico Caldeira Knabben (fredck@fckeditor.net)
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 */
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// Get the selection type.
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FCKSelection.GetType = function()
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{
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	return FCK.EditorDocument.selection.type ;
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}
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// Retrieves the selected element (if any), just in the case that a single
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// element (object like and image or a table) is selected.
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FCKSelection.GetSelectedElement = function()
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{
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	if ( this.GetType() == 'Control' )
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	{
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		var oRange = FCK.EditorDocument.selection.createRange() ;
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		if ( oRange && oRange.item )
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			return FCK.EditorDocument.selection.createRange().item(0) ;
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	}
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}
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FCKSelection.GetParentElement = function()
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{
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	switch ( this.GetType() )
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	{
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		case 'Control' :
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			return FCKSelection.GetSelectedElement().parentElement ;
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		case 'None' :
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			return ;
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		default :
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			return FCK.EditorDocument.selection.createRange().parentElement() ;
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	}
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}
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FCKSelection.SelectNode = function( node )
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{
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	FCK.Focus() ;
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	FCK.EditorDocument.selection.empty() ;
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	try
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	{
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		// Try to select the node as a control.
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		var oRange = FCK.EditorDocument.body.createControlRange() ;
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		oRange.addElement( node ) ;
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	}
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	catch(e)
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	{
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		// If failed, select it as a text range.
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		var oRange = FCK.EditorDocument.selection.createRange() ;
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		oRange.moveToElementText( node ) ;
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	}
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	oRange.select() ;
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}
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FCKSelection.Collapse = function( toStart )
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{
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	FCK.Focus() ;
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	if ( this.GetType() == 'Text' )
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	{
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		var oRange = FCK.EditorDocument.selection.createRange() ;
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		oRange.collapse( toStart == null || toStart === true ) ;
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		oRange.select() ;
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	}
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}
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// The "nodeTagName" parameter must be Upper Case.
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FCKSelection.HasAncestorNode = function( nodeTagName )
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{
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	var oContainer ;
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	if ( FCK.EditorDocument.selection.type == "Control" )
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	{
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		oContainer = this.GetSelectedElement() ;
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	}
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	else
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	{
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		var oRange  = FCK.EditorDocument.selection.createRange() ;
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		oContainer = oRange.parentElement() ;
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	}
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	while ( oContainer )
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	{
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		if ( oContainer.tagName == nodeTagName ) return true ;
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		oContainer = oContainer.parentNode ;
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	}
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	return false ;
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}
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// The "nodeTagName" parameter must be UPPER CASE.
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FCKSelection.MoveToAncestorNode = function( nodeTagName )
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{
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	var oNode ;
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	if ( FCK.EditorDocument.selection.type == "Control" )
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	{
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		var oRange = FCK.EditorDocument.selection.createRange() ;
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		for ( i = 0 ; i < oRange.length ; i++ )
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		{
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			if (oRange(i).parentNode)
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			{
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				oNode = oRange(i).parentNode ;
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				break ;
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			}
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		}
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	}
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	else
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	{
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		var oRange  = FCK.EditorDocument.selection.createRange() ;
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		oNode = oRange.parentElement() ;
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	}
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	while ( oNode && oNode.nodeName != nodeTagName )
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		oNode = oNode.parentNode ;
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	return oNode ;
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}
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FCKSelection.Delete = function()
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{
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	// Gets the actual selection.
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	var oSel = FCK.EditorDocument.selection ;
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	// Deletes the actual selection contents.
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	if ( oSel.type.toLowerCase() != "none" )
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	{
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		oSel.clear() ;
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	}
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	return oSel ;
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}
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