?/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2007 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Controls the [Enter] keystroke behavior in a document.
 */

/*
 *	Constructor.
 *		@targetDocument : the target document.
 *		@enterMode : the behavior for the <Enter> keystroke.
 *			May be "p", "div", "br". Default is "p".
 *		@shiftEnterMode : the behavior for the <Shift>+<Enter> keystroke.
 *			May be "p", "div", "br". Defaults to "br".
 */
var FCKEnterKey = function( targetWindow, enterMode, shiftEnterMode )
{
	this.Window			= targetWindow ;
	this.EnterMode		= enterMode || 'p' ;
	this.ShiftEnterMode	= shiftEnterMode || 'br' ;

	// Setup the Keystroke Handler.
	var oKeystrokeHandler = new FCKKeystrokeHandler( false ) ;
	oKeystrokeHandler._EnterKey = this ;
	oKeystrokeHandler.OnKeystroke = FCKEnterKey_OnKeystroke ;

	oKeystrokeHandler.SetKeystrokes( [
		[ 13		, 'Enter' ],
		[ SHIFT + 13, 'ShiftEnter' ],
		[ 8			, 'Backspace' ],
		[ 46		, 'Delete' ]
	] ) ;

	oKeystrokeHandler.AttachToElement( targetWindow.document ) ;
}


function FCKEnterKey_OnKeystroke(  keyCombination, keystrokeValue )
{
	var oEnterKey = this._EnterKey ;

	try
	{
		switch ( keystrokeValue )
		{
			case 'Enter' :
				return oEnterKey.DoEnter() ;
				break ;

			case 'ShiftEnter' :
				return oEnterKey.DoShiftEnter() ;
				break ;

			case 'Backspace' :
				return oEnterKey.DoBackspace() ;
				break ;

			case 'Delete' :
				return oEnterKey.DoDelete() ;
		}
	}
	catch (e)
	{
		// If for any reason we are not able to handle it, go
		// ahead with the browser default behavior.
	}

	return false ;
}

/*
 * Executes the <Enter> key behavior.
 */
FCKEnterKey.prototype.DoEnter = function( mode, hasShift )
{
	this._HasShift = ( hasShift === true ) ;

	var sMode = mode || this.EnterMode ;

	if ( sMode == 'br' )
		return this._ExecuteEnterBr() ;
	else
		return this._ExecuteEnterBlock( sMode ) ;
}

/*
 * Executes the <Shift>+<Enter> key behavior.
 */
FCKEnterKey.prototype.DoShiftEnter = function()
{
	return this.DoEnter( this.ShiftEnterMode, true ) ;
}

/*
 * Executes the <Backspace> key behavior.
 */
FCKEnterKey.prototype.DoBackspace = function()
{
	var bCustom = false ;

	// Get the current selection.
	var oRange = new FCKDomRange( this.Window ) ;
	oRange.MoveToSelection() ;

	if ( !oRange.CheckIsCollapsed() )
		return false ;

	var oStartBlock = oRange.StartBlock ;
	var oEndBlock = oRange.EndBlock ;

	// The selection boundaries must be in the same "block limit" element
	if ( oRange.StartBlockLimit == oRange.EndBlockLimit && oStartBlock && oEndBlock )
	{
		if ( !oRange.CheckIsCollapsed() )
		{
			var bEndOfBlock = oRange.CheckEndOfBlock() ;

			oRange.DeleteContents() ;

			if ( oStartBlock != oEndBlock )
			{
				oRange.SetStart(oEndBlock,1) ;
				oRange.SetEnd(oEndBlock,1) ;

//				if ( bEndOfBlock )
//					oEndBlock.parentNode.removeChild( oEndBlock ) ;
			}

			oRange.Select() ;

			bCustom = ( oStartBlock == oEndBlock ) ;
		}

		if ( oRange.CheckStartOfBlock() )
		{
			var oCurrentBlock = oRange.StartBlock ;

			var ePrevious = FCKDomTools.GetPreviousSourceElement( oCurrentBlock, true, [ 'BODY', oRange.StartBlockLimit.nodeName ], ['UL','OL'] ) ;

			bCustom = this._ExecuteBackspace( oRange, ePrevious, oCurrentBlock ) ;
		}
		else if ( FCKBrowserInfo.IsGecko )
		{
			// Firefox looses the selection when executing CheckStartOfBlock, so we must reselect.
			oRange.Select() ;
		}
	}

	oRange.Release() ;
	return bCustom ;
}

FCKEnterKey.prototype._ExecuteBackspace = function( range, previous, currentBlock )
{
	var bCustom = false ;

	// We could be in a nested LI.
	if ( !previous && currentBlock && currentBlock.nodeName.IEquals( 'LI' ) && currentBlock.parentNode.parentNode.nodeName.IEquals( 'LI' ) )
	{
		this._OutdentWithSelection( currentBlock, range ) ;
		return true ;
	}

	if ( previous && previous.nodeName.IEquals( 'LI' ) )
	{
		var oNestedList = FCKDomTools.GetLastChild( previous, ['UL','OL'] ) ;

		while ( oNestedList )
		{
			previous = FCKDomTools.GetLastChild( oNestedList, 'LI' ) ;
			oNestedList = FCKDomTools.GetLastChild( previous, ['UL','OL'] ) ;
		}
	}

	if ( previous && currentBlock )
	{
		// If we are in a LI, and the previous block is not an LI, we must outdent it.
		if ( currentBlock.nodeName.IEquals( 'LI' ) && !previous.nodeName.IEquals( 'LI' ) )
		{
			this._OutdentWithSelection( currentBlock, range ) ;
			return true ;
		}

		// Take a reference to the parent for post processing cleanup.
		var oCurrentParent = currentBlock.parentNode ;

		var sPreviousName = previous.nodeName.toLowerCase() ;
		if ( FCKListsLib.EmptyElements[ sPreviousName ] != null || sPreviousName == 'table' )
		{
			FCKDomTools.RemoveNode( previous ) ;
			bCustom = true ;
		}
		else
		{
			// Remove the current block.
			FCKDomTools.RemoveNode( currentBlock ) ;

			// Remove any empty tag left by the block removal.
			while ( oCurrentParent.innerHTML.Trim().length == 0 )
			{
				var oParent = oCurrentParent.parentNode ;
				oParent.removeChild( oCurrentParent ) ;
				oCurrentParent = oParent ;
			}

			// Cleanup the previous and the current elements.
			FCKDomTools.TrimNode( currentBlock ) ;
			FCKDomTools.TrimNode( previous ) ;

			// Append a space to the previous.
			// Maybe it is not always desirable...
			// previous.appendChild( this.Window.document.createTextNode( ' ' ) ) ;

			// Set the range to the end of the previous element and bookmark it.
			range.SetStart( previous, 2 ) ;
			range.Collapse( true ) ;
			var oBookmark = range.CreateBookmark() ;

			// Move the contents of the block to the previous element and delete it.
			FCKDomTools.MoveChildren( currentBlock, previous ) ;

			// Place the selection at the bookmark.
			range.MoveToBookmark( oBookmark ) ;
			range.Select() ;

			bCustom = true ;
		}
	}

	return bCustom ;
}

/*
 * Executes the <Delete> key behavior.
 */
FCKEnterKey.prototype.DoDelete = function()
{
	// The <Delete> has the same effect as the <Backspace>, so we have the same
	// results if we just move to the next block and apply the same <Backspace> logic.

	var bCustom = false ;

	// Get the current selection.
	var oRange = new FCKDomRange( this.Window ) ;
	oRange.MoveToSelection() ;

	// There is just one special case for collapsed selections at the end of a block.
	if ( oRange.CheckIsCollapsed() && oRange.CheckEndOfBlock( FCKBrowserInfo.IsGeckoLike ) )
	{
		var oCurrentBlock = oRange.StartBlock ;

		var eNext = FCKDomTools.GetNextSourceElement( oCurrentBlock, true, [ oRange.StartBlockLimit.nodeName ], ['UL','OL'] ) ;

		bCustom = this._ExecuteBackspace( oRange, oCurrentBlock, eNext ) ;
	}

	oRange.Release() ;
	return bCustom ;
}

FCKEnterKey.prototype._ExecuteEnterBlock = function( blockTag, range )
{