/* System.Web.UI.HtmlControls
* Authors
* Leen Toelen (toelen@hotmail.com)
*/
using System;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Globalization;
using System.Web;
using System.Web.UI;
namespace System.Web.UI.HtmlControls{
[DefaultEvent("ServerChange")]
public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler{
private static readonly object EventServerChange = new object ();
public HtmlInputCheckBox(): base("checkbox"){}
bool IPostBackDataHandler.LoadPostData (string postDataKey,
NameValueCollection postCollection)
{
string postValue = postCollection [postDataKey];
bool postChecked = false;
bool retval = false;
if (postValue != null)
postChecked = postValue.Length > 0;
if (Checked != postChecked){
retval = true;
Checked = postChecked;
}
return retval;
}
void IPostBackDataHandler.RaisePostDataChangedEvent ()
{
OnServerChange (EventArgs.Empty);
}
protected virtual void OnServerChange(EventArgs e){
EventHandler handler = (EventHandler) Events[EventServerChange];
if (handler != null) handler.Invoke(this, e);
}
protected override void OnPreRender(EventArgs e){
if (Page != null && !Disabled)
Page.RegisterRequiresPostBack(this);
if (Events[EventServerChange] != null && !Disabled)
ViewState.SetItemDirty("checkbox",false);
}
[WebCategory("Action")]
[WebSysDescription("Fires when the checked satte of the control is changed.")]
public event EventHandler ServerChange{
add{
Events.AddHandler(EventServerChange, value);
}
remove{
Events.RemoveHandler(EventServerChange, value);
}
}
[DefaultValue("")]
[WebCategory("Misc")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public bool Checked{
get{
string attr = Attributes["checked"];
if (attr != null)
return attr.Equals("checked");
return false;
}
set{
Attributes["checked"] = (value == true)? "checked": null;
}
}
} // class HtmlInputCheckBox
} // namespace System.Web.UI.HtmlControls