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/**
* Namespace: System.Web.UI.WebControls
* Class: ImageButton
*
* 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.Collections;
using System.Collections.Specialized;
using System.Web;
using System.Web.UI;
using System.ComponentModel;
namespace System.Web.UI.WebControls
{
[DefaultEvent("Click")]
public class ImageButton: Image, IPostBackDataHandler, IPostBackEventHandler
{
private static readonly object ClickEvent = new object();
private static readonly object CommandEvent = new object();
private int x, y;
public ImageButton(): base()
{
}
public bool CausesValidation
{
get
{
object o = ViewState["CausesValidation"];
if(o!=null)
return (bool)o;
return true;
}
set
{
ViewState["CausesValidation"] = value;
}
}
public string CommandArgument
{
get
{
object o = ViewState["CommandArgument"];
if(o!=null)
return (string)o;
return String.Empty;
}
set
{
ViewState["CommandArgument"] = value;
}
}
public string CommandName
{
get
{
object o = ViewState["CommandName"];
if(o!=null)
return (string)o;
return String.Empty;
}
set
{
ViewState["CommandName"] = value;
}
}
protected override HtmlTextWriterTag TagKey
{
get
{
return HtmlTextWriterTag.Input;
}
}
public event ImageClickEventHandler 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 override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Type, "image");
writer.AddAttribute(HtmlTextWriterAttribute.Name, UniqueID);
if(Page != null && CausesValidation)
{
if(Page.Validators.Count > 0)
{
writer.AddAttribute(HtmlTextWriterAttribute.Onclick, Utils.GetClientValidatedEvent(Page));
writer.AddAttribute("language", "javascript");
}
}
base.AddAttributesToRender(writer);
}
protected virtual void OnClick(ImageClickEventArgs e)
{
if(Events != null)
{
ImageClickEventHandler iceh = (ImageClickEventHandler)(Events[ClickEvent]);
if(iceh != null)
iceh(this, e);
}
}
protected virtual void OnCommand(CommandEventArgs e)
{
if(Events != null)
{
CommandEventHandler ceh = (CommandEventHandler)(Events[CommandEvent]);
if(ceh != null)
ceh(this, e);
RaiseBubbleEvent(this, e);
}
}
protected override void OnPreRender(EventArgs e)
{
if(Page != null)
{
Page.RegisterRequiresPostBack(this);
}
}
bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
{
string xCoord = postCollection[UniqueID + ".x"];
string yCoord = postCollection[UniqueID + ".y"];
if(xCoord != null && yCoord != null && xCoord.Length > 0 && yCoord.Length > 0)
{
x = Int32.Parse(xCoord);
y = Int32.Parse(yCoord);
Page.RegisterRequiresRaiseEvent(this);
}
return false;
}
void IPostBackDataHandler.RaisePostDataChangedEvent()
{
}
void IPostBackEventHandler.RaisePostBackEvent(string eventArgument)
{
if(CausesValidation)
Page.Validate();
OnClick(new ImageClickEventArgs(x, y));
OnCommand(new CommandEventArgs(CommandName, CommandArgument));
}
}
}
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