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/**
* Namespace: System.Web.UI.WebControls
* Class: Button
*
* 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.ComponentModel;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
[DefaultEvent("Click")]
[DefaultProperty("Text")]
//TODO: [Designer("??")]
//TODO: [DataBindingHandler("??UI.Design.TextDataBindingHandler??")]
[ToolboxData("<{0}:Button runat=\"server\" Text=\"Button\"></{0}:Button>")]
public class Button : WebControl, IPostBackEventHandler
{
private static readonly object ClickEvent = new object();
private static readonly object CommandEvent = new object();
//private EventHandlerList ehList;
public Button(): base(HtmlTextWriterTag.Button)
{
}
public bool CausesValidation
{
get
{
Object cv = ViewState["CausesValidation"];
if(cv!=null)
return (Boolean)cv;
return true;
}
set
{
ViewState["CausesValidation"] = value;
}
}
public string CommandArgument
{
get
{
string ca = (string) ViewState["CommandArgument"];
if(ca!=null)
return ca;
return String.Empty;
}
set
{
ViewState["CommandArgument"] = value;
}
}
public string CommandName
{
get
{
string cn = (string)ViewState["CommandName"];
if(cn!=null)
return cn;
return String.Empty;
}
set
{
ViewState["CommandName"] = value;
}
}
public string Text
{
get
{
string text = (string)ViewState["Text"];
if(text!=null)
return text;
return String.Empty;
}
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)
{
EventHandler eh = (EventHandler)(Events[CommandEvent]);
if(eh!= null)
eh(this,e);
}
}
void IPostBackEventHandler.RaisePostBackEvent(string eventArgument)
{
if(CausesValidation)
{
Page.Validate();
OnClick(new EventArgs());
OnCommand(new CommandEventArgs(CommandName, CommandArgument));
}
}
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Type,"submit");
writer.AddAttribute(HtmlTextWriterAttribute.Name,base.UniqueID);
writer.AddAttribute(HtmlTextWriterAttribute.Value,Text);
if(Page!=null && CausesValidation && Page.Validators.Count > 0)
{
writer.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Onclick, Utils.GetClientValidatedEvent(Page));
writer.AddAttribute("language", "javascript");
}
base.AddAttributesToRender(writer);
}
protected override void RenderContents(HtmlTextWriter writer)
{
// Preventing subclasses to do anything
}
}
}
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