source: trunk/admin/inc/FCKeditor/editor/_source/internals/fcktablehandler.js@ 2

/*
 * FCKeditor - The text editor for internet
 * Copyright (C) 2003-2006 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/
 * 
 * "Support Open Source software. What about a donation today?"
 * 
 * File Name: fcktablehandler.js
 *      Manage table operations.
 * 
 * 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 )
        {
                var table = FCKSelection.GetSelectedElement() ;
                if ( !table || table.tagName != 'TABLE' )
                        table = FCKSelection.MoveToAncestorNode("TABLE") ;
        }
        if ( !table ) return ;

        // Delete the table.
        FCKSelection.SelectNode( table ) ;
        FCKSelection.Collapse();
        table.parentNode.removeChild( table ) ;
}

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

        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 ;
                
                oCell = oRow.cells[iIndex-1].cloneNode(false) ;
                
                if ( FCKBrowserInfo.IsGecko )
                        oCell.innerHTML = GECKO_BOGUS ;
                
                // 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 )
                        oRow.insertBefore( oCell, oBaseCell ) ; // Insert the new cell just before of it.
                else
                        oRow.appendChild( oCell ) ;                             // Append the cell at the end of the row.
        }
}

FCKTableHandler.DeleteColumns = function()
{
        // Get the cell where the selection is placed in.
        var oCell = FCKSelection.MoveToAncestorNode('TD') || FCKSelection.MoveToAncestorNode('TH') ;

        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");
        if ( FCKBrowserInfo.IsGecko )
                oNewCell.innerHTML = GECKO_BOGUS ;
//      oNewCell.innerHTML = "&nbsp;" ;

        // If it is the last cell in the row.
        if ( oCell.cellIndex == oCell.parentNode.cells.length - 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 = '' ;
        var oCellsContents = FCK.EditorDocument.createDocumentFragment() ;
        
        for ( var i = aCells.length - 1 ; i >= 0 ; i-- )
        {
                var eCell = aCells[i] ;
                
                // Move its contents to the document fragment.
                for ( var c = eCell.childNodes.length - 1 ; c >= 0 ; c-- )
                {
                        var eChild = eCell.removeChild( eCell.childNodes[c] ) ;
        
                        if ( ( eChild.hasAttribute && eChild.hasAttribute('_moz_editor_bogus_node') ) || ( eChild.getAttribute && eChild.getAttribute( 'type', 2 ) == '_moz' ) )
                                continue ;
                        
                                oCellsContents.insertBefore( eChild, oCellsContents.firstChild ) ;
                }
                
                if ( i > 0 )
                {
                        // Accumulate the colspan of the cell.
                        iColSpan += isNaN( eCell.colSpan ) ? 1 : eCell.colSpan ;

                        // Delete the cell.
                        FCKTableHandler.DeleteCell( eCell ) ;
                }
        }
        
        // Set the innerHTML of the remaining cell (the first one).
        aCells[0].colSpan = iColSpan ;
        
        if ( FCKBrowserInfo.IsGecko && oCellsContents.childNodes.length == 0 )
                aCells[0].innerHTML = GECKO_BOGUS ;
        else
                aCells[0].appendChild( oCellsContents ) ;
}

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

// 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 "nothing".
        for ( var i = 0 ; i < aCells.length ; i++ ) 
        {
                if ( FCKBrowserInfo.IsGecko )
                        aCells[i].innerHTML = GECKO_BOGUS ;
                else
                        aCells[i].innerHTML = '' ;
        }
}