using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;

public class EmptyGridView : GridView
{
	#region Properties

	/// <summary>
	/// Enable or Disable generating an empty table if no data rows in source
	/// </summary>
	[
	Description("Enable or disable generating an empty table with headers if no data rows in source"),
	Category("Misc"),
	DefaultValue("true"),
	]
	public bool ShowEmptyTable
	{
		get
		{
			object o = ViewState["ShowEmptyTable"];
			return (o != null ? (bool)o : true);
		}
		set
		{
			ViewState["ShowEmptyTable"] = value;
		}
	}
	
	/// <summary>
	/// Get or Set Text to display in empty data row
	/// </summary>
	[
	Description("Text to display in empty data row"),
	Category("Misc"),
	DefaultValue(""),
	]
	public string EmptyTableRowText
	{
		get
		{
			object o = ViewState["EmptyTableRowText"];
			return (o != null ? o.ToString() : "");
		}
		set
		{
			ViewState["EmptyTableRowText"] = value;
		}
	}

	#endregion


	protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
	{
		int numRows = base.CreateChildControls(dataSource, dataBinding);

		//no data rows created, create empty table if enabled
		if (numRows == 0 && ShowEmptyTable)
		{
			//create table
			Table table = new Table();
			table.ID = this.ID;

			//create a new header row
			GridViewRow row = base.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);

			//convert the exisiting columns into an array and initialize
			DataControlField[] fields = new DataControlField[this.Columns.Count];
			this.Columns.CopyTo(fields, 0);
			this.InitializeRow(row, fields);
			table.Rows.Add(row);

			//create the empty row
			row = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);
			TableCell cell = new TableCell();
			cell.ColumnSpan = this.Columns.Count;
			cell.Width = Unit.Percentage(100);
			cell.Controls.Add(new LiteralControl(EmptyTableRowText));
			row.Cells.Add(cell);
			table.Rows.Add(row);

			this.Controls.Add(table);
		}

		return numRows;
	}
}