using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// A template for GridView columns which contain a label and a textbox
/// </summary>
public class GridViewTemplate : System.Web.UI.Page, ITemplate {
    private ListItemType templateType;
    private string columnName;

    /// <summary>
    /// Initializes a new GridViewTemplate for the specified column name
    /// </summary>
    /// <param name="type">The field type.</param>
    /// <param name="colname">The name of the column.</param>
    public GridViewTemplate(ListItemType type, string colname) {
        templateType = type;
        columnName = colname;
    }

    /// <summary>
    /// Adds the appropriate controls to a container
    /// </summary>
    /// <param name="container">The <see cref="T:System.Web.UI.Control"/> object to contain the instances of controls from the inline template.</param>
    public void InstantiateIn(System.Web.UI.Control container) {
        Label lbl;
        TextBox txt;
        switch(templateType) {
            case ListItemType.Header:
                lbl = new Label();
                try {
                    lbl.Text = System.Globalization.CultureInfo.GetCultureInfoByIetfLanguageTag(columnName).EnglishName + " (<small>" + columnName + "</small>)";
                } catch {
                    lbl.Text = columnName;
                }
                lbl.EnableViewState = false;
                container.Controls.Add(lbl);
                break;
            case ListItemType.Item:
                lbl = new Label();
                container.Controls.Add(lbl);
                lbl.EnableViewState = false;
                lbl.DataBinding += new EventHandler(lbl_DataBinding);
                txt = new TextBox();
                txt.Visible = false;
                txt.TextMode = TextBoxMode.MultiLine;
                txt.EnableViewState = false;
                container.Controls.Add(txt);
                txt.DataBinding += new EventHandler(txt_DataBinding);
                break;
            case ListItemType.Footer:
                txt = new TextBox();
                txt.TextMode = TextBoxMode.MultiLine;
                txt.ID = container.UniqueID + "$" + columnName;
                txt.EnableViewState = false;
                container.Controls.Add(txt);
                break;
        }
    }

    /// <summary>
    /// Databinds the textbox and assigns it an ID based on the column name.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
    private void txt_DataBinding(object sender, EventArgs e) {
        TextBox txt = sender as TextBox;
        GridViewRow row = txt.NamingContainer as GridViewRow;
        txt.ID = row.UniqueID+"$"+columnName;
        object dataValue = DataBinder.Eval(row.DataItem, columnName);
        if(dataValue != DBNull.Value) {
            txt.Text = dataValue.ToString();
        }
    }

    /// <summary>
    /// Databinds the label.
    /// </summary>
    /// <param name="sender">The source of the event.</param>
    /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
    private void lbl_DataBinding(object sender, EventArgs e) {
        Label lbl = sender as Label;
        GridViewRow row = lbl.NamingContainer as GridViewRow;
        object dataValue = DataBinder.Eval(row.DataItem, columnName);
        if(dataValue != DBNull.Value) {
            lbl.Text = dataValue.ToString();
        }
    }


}