/*
 * FCKeditor - The text editor for internet
 * Copyright (C) 2003-2004 Frederico Caldeira Knabben
 * 
 * Licensed under the terms of the GNU Lesser General Public License:
 * http://www.opensource.org/licenses/lgpl-license.php
 * 
 * For further information visit:
 * http://www.fckeditor.net/
 * 
 * File Name: fcktablehandler.js
 * Manage table operations.
 * 
 * Version:  2.0 RC3
 * Modified: 2004-12-16 00:41:05
 * 
 * File Authors:
 * Frederico Caldeira Knabben (fredck@fckeditor.net)
 */

var FCKTableHandler = new Object() ;

FCKTableHandler.InsertRow = function()
{
// Get the row where the selection is placed in.
var oRow = FCKSelection.MoveToAncestorNode("TR") ;
if ( !oRow ) return ;

// Create a clone of the row.
var oNewRow = oRow.cloneNode( true ) ;

// Insert the new row (copy) before of it.
oRow.parentNode.insertBefore( oNewRow, oRow ) ;

// Clean the row (it seems that the new row has been added after it).
FCKTableHandler.ClearRow( oRow ) ;
}

FCKTableHandler.DeleteRows = function( row )
{
// If no row has been passed as a parameer,
// then get the row where the selection is placed in.
if ( !row )
row = FCKSelection.MoveToAncestorNode("TR") ;
if ( !row ) return ;

// Get the row's table.
var oTable = FCKTools.GetElementAscensor( row, 'TABLE' ) ;

// If just one row is available then delete the entire table.
if ( oTable.rows.length == 1 ) 
{
FCKTableHandler.DeleteTable( oTable ) ;
return ;
}

// Delete the row.
row.parentNode.removeChild( row ) ;
}

FCKTableHandler.DeleteTable = function( table )
{
// If no table has been passed as a parameer,
// then get the table where the selection is placed in.
if ( !table )
table = FCKSelection.MoveToAncestorNode("TABLE") ;
if ( !table ) return ;

// Delete the table.
table.parentNode.removeChild( table ) ;
}

FCKTableHandler.InsertColumn = function()
{
// Get the cell where the selection is placed in.
var oCell = FCKSelection.MoveToAncestorNode("TD") ;
if ( !oCell ) return ;

// Get the cell's table.
var oTable = FCKTools.GetElementAscensor( oCell, 'TABLE' ) ;

// Get the index of the column to be created (based on the cell).
var iIndex = oCell.cellIndex + 1 ;

// Loop throw all rows available in the table.
for ( var i = 0 ; i < oTable.rows.length ; i++ )
{
// Get the row.
var oRow = oTable.rows[i] ;

// If the row doens't have enought cells, ignore it.
if ( oRow.cells.length < iIndex )
continue ;

// Create the new cell element to be added.
oCell = FCK.EditorDocument.createElement('TD') ;
oCell.innerHTML = '&nbsp;' ;

// Get the cell that is placed in the new cell place.
var oBaseCell = oRow.cells[iIndex] ;

// If the cell is available (we are not in the last cell of the row).
if ( oBaseCell )
{
// Insert the new cell just before of it.
oRow.insertBefore( oCell, oBaseCell ) ;
}
else
{
// Append the cell at the end of the row.
oRow.appendChild( oCell ) ;
}
}
}

FCKTableHandler.DeleteColumns = function()
{
// Get the cell where the selection is placed in.
var oCell = FCKSelection.MoveToAncestorNode("TD") ;
if ( !oCell ) return ;

// Get the cell's table.
var oTable = FCKTools.GetElementAscensor( oCell, 'TABLE' ) ;

// Get the cell index.
var iIndex = oCell.cellIndex ;

// Loop throw all rows (from down to up, because it's possible that some
// rows will be deleted).
for ( var i = oTable.rows.length - 1 ; i >= 0 ; i-- )
{
// Get the row.
var oRow = oTable.rows[i] ;

// If the cell to be removed is the first one and the row has just one cell.
if ( iIndex == 0 && oRow.cells.length == 1 )
{
// Remove the entire row.
FCKTableHandler.DeleteRows( oRow ) ;
continue ;
}

// If the cell to be removed exists the delete it.
if ( oRow.cells[iIndex] )
oRow.removeChild( oRow.cells[iIndex] ) ;
}
}

FCKTableHandler.InsertCell = function( cell )
{
// Get the cell where the selection is placed in.
var oCell = cell ? cell : FCKSelection.MoveToAncestorNode("TD") ;
if ( !oCell ) return ;

// Create the new cell element to be added.
var oNewCell = FCK.EditorDocument.createElement("TD");
oNewCell.innerHTML = "&nbsp;" ;

// If it is the last cell in the row.
if ( oCell.cellIndex == oCell.parentNode.cells.lenght - 1 )
{
// Add the new cell at the end of the row.
oCell.parentNode.appendChild( oNewCell ) ;
}
else
{
// Add the new cell before the next cell (after the active one).
oCell.parentNode.insertBefore( oNewCell, oCell.nextSibling ) ;
}

return oNewCell ;
}

FCKTableHandler.DeleteCell = function( cell )
{
// If this is the last cell in the row.
if ( cell.parentNode.cells.length == 1 )
{
// Delete the entire row.
FCKTableHandler.DeleteRows( FCKTools.GetElementAscensor( cell, 'TR' ) ) ;
return ;
}

// Delete the cell from the row.
cell.parentNode.removeChild( cell ) ;
}

FCKTableHandler.DeleteCells = function()
{
var aCells = FCKTableHandler.GetSelectedCells() ;

for ( var i = aCells.length - 1 ; i >= 0  ; i-- )
{
FCKTableHandler.DeleteCell( aCells[i] ) ;
}
}

FCKTableHandler.MergeCells = function()
{
// Get all selected cells.
var aCells = FCKTableHandler.GetSelectedCells() ;

// At least 2 cells must be selected.
if ( aCells.length < 2 )
return ;

// The merge can occour only if the selected cells are from the same row.
if ( aCells[0].parentNode != aCells[aCells.length-1].parentNode )
return ;

// Calculate the new colSpan for the first cell.
var iColSpan = isNaN( aCells[0].colSpan ) ? 1 : aCells[0].colSpan ;

var sHtml = '' ;

for ( var i = aCells.length - 1 ; i > 0  ; i-- )
{
iColSpan += isNaN( aCells[i].colSpan ) ? 1 : aCells[i].colSpan ;

// Append the HTML of each cell.
sHtml = aCells[i].innerHTML + sHtml ;

// Delete the cell.
FCKTableHandler.DeleteCell( aCells[i] ) ;
}

// Set the innerHTML of the remaining cell (the first one).
aCells[0].colSpan = iColSpan ;
aCells[0].innerHTML += sHtml ;
}

FCKTableHandler.SplitCell = function()
{
// Check that just one cell is selected, otherwise return.
var aCells = FCKTableHandler.GetSelectedCells() ;
if ( aCells.length != 1 )
return ;

var aMap = this._CreateTableMap( aCells[0].parentNode.parentNode ) ;
var iCellIndex = FCKTableHandler._GetCellIndexSpan( aMap, aCells[0].parentNode.rowIndex , aCells[0] ) ;

var aCollCells = this._GetCollumnCells( aMap, iCellIndex ) ;

for ( var i = 0 ; i < aCollCells.length ; i++ )
{
if ( aCollCells[i] == aCells[0] )
{
var oNewCell = this.InsertCell( aCells[0] ) ;
if ( !isNaN( aCells[0].rowSpan ) && aCells[0].rowSpan > 1 )
oNewCell.rowSpan = aCells[0].rowSpan ;
}
else
{
if ( isNaN( aCollCells[i].colSpan ) )
aCollCells[i].colSpan = 2 ;
else
aCollCells[i].colSpan += 1 ;
}
}
}

// Get the cell index from a TableMap.
FCKTableHandler._GetCellIndexSpan = function( tableMap, rowIndex, cell )
{
if ( tableMap.length < rowIndex + 1 )
return ;

var oRow = tableMap[ rowIndex ] ;

for ( var c = 0 ; c < oRow.length ; c++ )
{
if ( oRow[c] == cell )
return c ;
}
}

// Get the cells available in a collumn of a TableMap.
FCKTableHandler._GetCollumnCells = function( tableMap, collumnIndex )
{
var aCollCells = new Array() ;

for ( var r = 0 ; r < tableMap.length ; r++ )
{
var oCell = tableMap[r][collumnIndex] ;
if ( oCell && ( aCollCells.length == 0 || aCollCells[ aCollCells.length - 1 ] != oCell ) )
aCollCells[ aCollCells.length ] = oCell ;
}

return aCollCells ;
}

// This function is quite hard to explain. It creates a matrix representing all cells in a table.
// The difference here is that the "spanned" cells (colSpan and rowSpan) are duplicated on the matrix
// cells that are "spanned". For example, a row with 3 cells where the second cell has colSpan=2 and rowSpan=3
// will produce a bi-dimensional matrix with the following values (representing the cells):
//Cell1, Cell2, Cell2, Cell 3
//Cell4, Cell2, Cell2, Cell 5
FCKTableHandler._CreateTableMap = function( table )
{
var aRows = table.rows ;

// Row and Collumn counters.
var r = -1 ;

var aMap = new Array() ;

for ( var i = 0 ; i < aRows.length ; i++ )
{
r++ ;
if ( !aMap[r] )
aMap[r] = new Array() ;

var c = -1 ;

for ( var j = 0 ; j < aRows[i].cells.length ; j++ )
{
var oCell = aRows[i].cells[j] ;

c++ ;
while ( aMap[r][c] )
c++ ;

var iColSpan = isNaN( oCell.colSpan ) ? 1 : oCell.colSpan ;
var iRowSpan = isNaN( oCell.rowSpan ) ? 1 : oCell.rowSpan ;

for ( var rs = 0 ; rs < iRowSpan ; rs++ )
{
if ( !aMap[r + rs] )
aMap[r + rs] = new Array() ;

for ( var cs = 0 ; cs < iColSpan ; cs++ )
{
aMap[r + rs][c + cs] = aRows[i].cells[j] ;
}
}

c += iColSpan - 1 ;
}
}
return aMap ;
}

FCKTableHandler.ClearRow = function( tr )
{
// Get the array of row's cells.
var aCells = tr.cells ;

// Replace the contents of each cell with "nbsp;".
for ( var i = 0 ; i < aCells.length ; i++ ) 
{
aCells[i].innerHTML = '&nbsp;' ;
}
}
