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/**
* Namespace: System.Web.UI.WebControls
* Class: ButtonColumn
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2002)
*/
using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
public class ButtonColumn : DataGridColumn
{
private PropertyDescriptor textFieldDescriptor;
public ButtonColumn(): base()
{
}
public override void Initialize()
{
Initialize();
textFieldDescriptor = null;
}
public override void InitializeCell(TableCell cell, int columnIndex, ListItemType itemType)
{
InitializeCell(cell, columnIndex, itemType);
if(Enum.IsDefined(typeof(ListItemType), itemType) && itemType != ListItemType.Footer)
{
WebControl toDisplay = null;
if(ButtonType == ButtonColumnType.PushButton)
{
Button b = new Button();
b.Text = Text;
b.CommandName = CommandName;
b.CausesValidation = false;
toDisplay = b;
} else
{
LinkButton lb = new LinkButton();
lb.Text = Text;
lb.CommandName = CommandName;
lb.CausesValidation = false;
toDisplay = lb;
}
if(DataTextField.Length > 0)
{
toDisplay.DataBinding += new EventHandler(OnDataBindButtonColumn);
}
cell.Controls.Add(toDisplay);
}
}
private void OnDataBindButtonColumn(object sender, EventArgs e)
{
Control ctrl = (Control)sender;
object item = ((DataGridItem)ctrl.NamingContainer).DataItem;
if(textFieldDescriptor == null)
{
textFieldDescriptor = TypeDescriptor.GetProperties(item).Find(DataTextField, true);
if(textFieldDescriptor == null && !DesignMode)
throw new HttpException(HttpRuntime.FormatResourceString("Field_Not_Found", DataTextField));
}
string text;
if(textFieldDescriptor != null)
{
text = FormatDataTextValue(textFieldDescriptor.GetValue(item));
} else
{
text = "Sample_DataBound_Text";
}
if(ctrl is LinkButton)
{
((LinkButton)ctrl).Text = text;
}
else
{
((Button)ctrl).Text = text;
}
}
protected virtual string FormatDataTextValue(object dataTextValue)
{
string retVal = null;
if(dataTextValue != null)
{
if(DataTextFormatString.Length > 0)
{
retVal = String.Format((string)dataTextValue, DataTextFormatString);
}
else
{
retVal = dataTextValue.ToString();
}
}
return retVal;
}
public virtual ButtonColumnType ButtonType
{
get
{
object o = ViewState["ButtonType"];
if(o!=null)
return (ButtonColumnType)o;
return ButtonColumnType.LinkButton;
}
set
{
if(!System.Enum.IsDefined(typeof(ButtonColumnType), value))
throw new ArgumentException();
ViewState["ButtonType"] = value;
}
}
public virtual string CommandName
{
get
{
string cn = (string)ViewState["CommandName"];
if(cn!=null)
return cn;
return String.Empty;
}
set
{
ViewState["CommandName"] = value;
}
}
public virtual string DataTextField
{
get
{
string dtf = (string)ViewState["DataTextField"];
if(dtf!=null)
return dtf;
return String.Empty;
}
set
{
ViewState["DataTextField"] = value;
}
}
public virtual string DataTextFormatString
{
get
{
string dtfs = (string)ViewState["DataTextFormatString"];
if(dtfs!=null)
return dtfs;
return String.Empty;
}
set
{
ViewState["DataTextFormatString"] = value;
}
}
public virtual string Text
{
get
{
string text = (string)ViewState["Text"];
if(text!=null)
return text;
return String.Empty;
}
set
{
ViewState["Text"] = value;
}
}
}
}
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