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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.ComponentModel;
using System.Globalization;
using System.Collections.Specialized;
namespace System.Web.UI.HtmlControls{
[DefaultEvent("ServerChange")]
[ValidationProperty("Value")]
public class HtmlTextArea : HtmlContainerControl, IPostBackDataHandler{
private static readonly object EventServerChange = new object ();
public HtmlTextArea(): base("textarea"){}
[DefaultValue("")]
[WebCategory("Appearance")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public int Cols{
get{
string attr = Attributes["cols"];
if (attr != null){
return Int32.Parse(attr, CultureInfo.InvariantCulture);
}
return -1;
}
set{
Attributes["cols"] = AttributeToString(value);
}
}
[DefaultValue("")]
[WebCategory("Appearance")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public int Rows{
get{
string attr = Attributes["rows"];
if (attr != null){
return Int32.Parse(attr, CultureInfo.InvariantCulture);;
}
return -1;
}
set{
Attributes["rows"] = AttributeToString(value);
}
}
[DefaultValue("")]
[WebCategory("Appearance")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public string Value{
get{
return InnerHtml;
}
set{
InnerHtml = value;
}
}
[DefaultValue("")]
[WebCategory("Behavior")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public virtual string Name{
get{
if (UniqueID != null){
return UniqueID;
}
return String.Empty;
}
set{}
}
[WebCategory("Action")]
[WebSysDescription("Fires when the text within the control changes.")]
public event EventHandler ServerChange{
add{
Events.AddHandler(EventServerChange, value);
}
remove{
Events.RemoveHandler(EventServerChange, value);
}
}
protected virtual void OnServerChange(EventArgs e){
EventHandler handler;
handler = (EventHandler) Events[EventServerChange];
if(handler != null){
handler (this, e);
}
}
bool IPostBackDataHandler.LoadPostData (string postDataKey,
NameValueCollection postCollection)
{
string currentValue = Value;
string postedValue = postCollection[postDataKey];
if (!currentValue.Equals(postedValue) && currentValue != null){
Value = HttpUtility.HtmlEncode(postedValue);
return true;
}
return false;
}
protected override void RenderAttributes(HtmlTextWriter writer){
writer.WriteAttribute("name", Name);
Attributes.Remove("name");
base.RenderAttributes(writer);
}
void IPostBackDataHandler.RaisePostDataChangedEvent ()
{
OnServerChange (EventArgs.Empty);
}
protected override void OnPreRender(EventArgs e){
if(Events[EventServerChange]==null || Disabled){
ViewState.SetItemDirty("value",false);
}
}
protected override void AddParsedSubObject(object obj){
if (obj is LiteralControl || obj is DataBoundLiteralControl)
base.AddParsedSubObject(obj);
else
throw new NotSupportedException("HtmlTextArea cannot have children of Type " + obj.GetType().Name);
}
} // class HtmlTextArea
} // namespace System.Web.UI.HtmlControls
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