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/**
* Namespace: System.Web.UI.WebControls
* Class: LinkButton
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Web;
using System.Web.UI;
using System.ComponentModel;
namespace System.Web.UI.WebControls
{
[DefaultEvent("Click")]
[DefaultProperty("Text")]
//[Designer("??")]
[ControlBuilder(typeof(LinkButtonControlBuilder))]
//[DataBindingHandler("??")]
[ParseChildren(false)]
[ToolboxData("<{0}:LinkButton runat=\"server\">LinkButton</{0}:LinkButton>")]
public class LinkButton : WebControl, IPostBackEventHandler
{
private static readonly object ClickEvent = new object();
private static readonly object CommandEvent = new object();
public LinkButton () : base (HtmlTextWriterTag.A)
{
}
public bool CausesValidation
{
get {
object o = ViewState ["CausesValidation"];
return (o == null) ? true : (bool) o;
}
set { ViewState ["CausesValidation"] = value; }
}
public string CommandArgument
{
get {
object o = ViewState ["CommandArgument"];
return (o == null) ? String.Empty : (string) o;
}
set { ViewState ["CommandArgument"] = value; }
}
public string CommandName
{
get {
object o = ViewState ["CommandName"];
return (o == null) ? String.Empty : (string) o;
}
set { ViewState ["CommandName"] = value; }
}
public virtual string Text
{
get {
object o = ViewState ["Text"];
return (o == null) ? String.Empty : (string) o;
}
set { ViewState ["Text"] = value; }
}
public event EventHandler Click
{
add { Events.AddHandler(ClickEvent, value); }
remove { Events.RemoveHandler(ClickEvent, value); }
}
public event CommandEventHandler Command
{
add { Events.AddHandler(CommandEvent, value); }
remove { Events.RemoveHandler(CommandEvent, value); }
}
protected virtual void OnClick (EventArgs e)
{
if(Events != null){
EventHandler eh = (EventHandler) (Events [ClickEvent]);
if (eh != null)
eh (this, e);
}
}
protected virtual void OnCommand (CommandEventArgs e)
{
if(Events != null){
CommandEventHandler ceh = (CommandEventHandler) (Events [CommandEvent]);
if (ceh != null)
ceh (this, e);
}
}
void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
{
if (CausesValidation)
Page.Validate ();
OnClick (EventArgs.Empty);
OnCommand (new CommandEventArgs (CommandName, CommandArgument));
}
protected override void AddAttributesToRender (HtmlTextWriter writer)
{
base.AddAttributesToRender (writer);
if (Enabled && Page != null){
if (CausesValidation && Page.Validators.Count > 0){
writer.AddAttribute (HtmlTextWriterAttribute.Href,
"javascript:" +
Utils.GetClientValidatedPostBack (this));
return;
}
writer.AddAttribute (HtmlTextWriterAttribute.Href,
Page.GetPostBackClientHyperlink (this, ""));
}
}
protected override void AddParsedSubObject (object obj)
{
if (HasControls ()){
base.AddParsedSubObject (obj);
return;
}
if (obj is LiteralControl){
Text = ((LiteralControl) obj).Text;
return;
}
if (Text.Length > 0){
base.AddParsedSubObject (new LiteralControl (Text));
Text = String.Empty;
}
base.AddParsedSubObject (obj);
}
protected override void LoadViewState (object savedState)
{
if (savedState != null){
base.LoadViewState (savedState);
string savedText = (string) ViewState ["Text"];
if (savedText != null)
Text = savedText;
}
}
protected override void RenderContents (HtmlTextWriter writer)
{
if (HasControls ()){
base.RenderContents (writer);
return;
}
writer.Write (Text);
}
}
}
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