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/* System.Web.UI.HtmlControls
* Authors
* Leen Toelen (toelen@hotmail.com)
*/
using System;
using System.Web;
using System.Web.UI;
using System.Globalization;
using System.Collections.Specialized;
namespace System.Web.UI.HtmlControls{
public class HtmlInputCheckBox : HtmlInputControl, IPostBackDataHandler{
private static readonly object EventServerChange;
public HtmlInputCheckBox(): base("checkbox"){}
public bool LoadPostData(string postDataKey, NameValueCollection postCollection){
string postValue = postCollection[postDataKey];
bool postChecked = false;
if (postValue != null)
postChecked = postValue.Length > 0;
Checked = postChecked;
return (postChecked == Checked == false);
}
public void RaisePostDataChangedEvent(){
OnServerChange(EventArgs.Empty);
}
protected 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);
}
public event EventHandler ServerChange{
add{
Events.AddHandler(EventServerChange, value);
}
remove{
Events.RemoveHandler(EventServerChange, value);
}
}
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
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