/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * Internal utility class that provides a unique cell context.
 * @private
 */
Ext.define('Ext.grid.CellContext', {

    /**
     * @property {Boolean} isCellContext
     * @readonly
     * `true` in this class to identify an object as an instantiated CellContext, or subclass thereof.
     */
    isCellContext: true,
    
    constructor: function(view) {
        this.view = view;
    },
    
    // Selection row/record & column/columnHeader
    setPosition: function(row, col) {
        var me = this;

        // We were passed {row: 1, column: 2, view: myView}
        if (arguments.length === 1) {
            if (row.view) {
                me.view = row.view;
            }
            col = row.column;
            row = row.row;
        }

        me.setRow(row);
        me.setColumn(col);
        return me;
    },

    setRow: function(row) {
        var me = this;
        if (row !== undefined) {
            // Row index passed
            if (typeof row === 'number') {
                me.row = Math.max(Math.min(row, me.view.dataSource.getCount() - 1), 0);
                me.record = me.view.dataSource.getAt(row);
            }
            // row is a Record
            else if (row.isModel) {
                me.record = row;
                me.row = me.view.indexOf(row);
            }
            // row is a grid row
            else if (row.tagName) {
                me.record = me.view.getRecord(row);
                me.row = me.view.indexOf(me.record);
            }
        }
    },
    
    setColumn: function(col) {
        var me = this,
            columnManager = me.view.ownerCt.columnManager;
        if (col !== undefined) {
            // column index passed
            if (typeof col === 'number') {
                me.column = col;
                me.columnHeader = columnManager.getHeaderAtIndex(col);
            }
            // column Header passed
            else if (col.isHeader) {
                me.columnHeader = col;
                me.column = columnManager.getHeaderIndex(col);
            }
        }
    }
});