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//
// System.Web.UI.WebControls.Button.cs
//
// Authors:
// Gaurav Vaish (gvaish@iitk.ac.in)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) Gaurav Vaish (2002)
// (C) 2003 Andreas Nahr
//
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.WebControls
{
[DefaultEvent("Click")]
[DefaultProperty("Text")]
[Designer("System.Web.UI.Design.WebControls.ButtonDesigner, " + Consts.AssemblySystem_Design, typeof (IDesigner))]
[DataBindingHandler("System.Web.UI.Design.TextDataBindingHandler, " + Consts.AssemblySystem_Design)]
[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.Input)
{
}
[DefaultValue (true), Bindable (false), WebCategory ("Behavior")]
[WebSysDescription ("Determines if validation is performed when clicked.")]
public bool CausesValidation
{
get
{
Object cv = ViewState["CausesValidation"];
if(cv!=null)
return (Boolean)cv;
return true;
}
set
{
ViewState["CausesValidation"] = value;
}
}
[DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
[WebSysDescription ("An argument for the Command of this control.")]
public string CommandArgument
{
get
{
string ca = (string) ViewState["CommandArgument"];
if(ca!=null)
return ca;
return String.Empty;
}
set
{
ViewState["CommandArgument"] = value;
}
}
[DefaultValue (""), WebCategory ("Behavior")]
[WebSysDescription ("The name of the Command of this control.")]
public string CommandName
{
get
{
string cn = (string)ViewState["CommandName"];
if(cn!=null)
return cn;
return String.Empty;
}
set
{
ViewState["CommandName"] = value;
}
}
[DefaultValue (""), Bindable (true), WebCategory ("Appearance")]
[WebSysDescription ("The text that should be shown on this Button.")]
public string Text
{
get
{
string text = (string)ViewState["Text"];
if(text!=null)
return text;
return String.Empty;
}
set
{
ViewState["Text"] = value;
}
}
[WebCategory ("Action")]
[WebSysDescription ("Raised when the Button is clicked.")]
public event EventHandler Click
{
add
{
Events.AddHandler(ClickEvent, value);
}
remove
{
Events.RemoveHandler(ClickEvent, value);
}
}
[WebCategory ("Action")]
[WebSysDescription ("Raised when a Button Command is executed.")]
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 eh = (CommandEventHandler)(Events[CommandEvent]);
if(eh!= null)
eh(this,e);
}
RaiseBubbleEvent(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)
{
if (Page != null)
Page.VerifyRenderingInServerForm (this);
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 base classes to do anything
}
}
}
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