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//
// System.Web.UI.WebControls.ListItem.cs
//
// Authors:
// Gaurav Vaish (gvaish@iitk.ac.in)
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//
// (C) Gaurav Vaish (2002)
// (C) 2003 Andreas Nahr
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Web;
using System.Web.UI;
using System.ComponentModel;
namespace System.Web.UI.WebControls
{
[TypeConverter(typeof(ExpandableObjectConverter))]
[ControlBuilder(typeof(ListItemControlBuilder))]
public sealed class ListItem : IStateManager, IParserAccessor, IAttributeAccessor
{
private AttributeCollection attributes;
private string text;
private string val;
private bool marked;
private bool selected;
private bool dirty_t;
private bool dirty_v;
public ListItem(string text, string value)
{
this.text = text;
this.val = value;
attributes = null;
}
public ListItem(string text): this(text, null)
{
}
public ListItem(): this(null, null)
{
}
public static ListItem FromString(string text)
{
return new ListItem(text);
}
[Browsable (false), DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
public AttributeCollection Attributes
{
get
{
if(attributes == null)
attributes = new AttributeCollection(new StateBag(true));
return attributes;
}
}
[DefaultValue (false)]
public bool Selected
{
get {
return selected;
}
set {
selected = value;
}
}
internal bool Dirty
{
get {
return (dirty_t && dirty_v);
}
set {
dirty_t = value;
dirty_v = value;
}
}
[DefaultValue ("")]
[PersistenceMode (PersistenceMode.EncodedInnerDefaultProperty)]
public string Text
{
get
{
if(text!=null)
{
return text;
}
if(val!=null)
{
return val;
}
return String.Empty;
}
set
{
text = value;
if (IsTrackingViewState)
dirty_t = true;
}
}
[DefaultValue ("")]
public string Value
{
get {
if (val != null)
return val;
if (text != null)
return text;
return String.Empty;
}
set
{
val = value;
if(IsTrackingViewState)
dirty_v = true;
}
}
string IAttributeAccessor.GetAttribute (string key)
{
if (attributes == null)
return null;
return attributes [key];
}
void IAttributeAccessor.SetAttribute (string key, string value)
{
Attributes [key] = value;
}
/// <remarks>
/// The data is parsed - object must be of type LiteralControl or DataBoundLiteralControl.
/// In latter case, throw an exception telling that the data cannot be bind-ed.
/// </remarks>
void IParserAccessor.AddParsedSubObject(object obj)
{
if(obj is LiteralControl)
{
Text = ((LiteralControl)obj).Text;
return;
}
if(obj is DataBoundLiteralControl)
{
throw new HttpException(HttpRuntime.FormatResourceString("Control_Cannot_DataBind","ListItem"));
}
throw new HttpException(HttpRuntime.FormatResourceString("Cannot_Have_Children_Of_Type", "ListItem", obj.GetType().ToString()));
}
bool IsTrackingViewState
{
get
{
return marked;
}
}
internal void TrackViewState()
{
marked = true;
}
internal void LoadViewState(object state)
{
if(state is Pair)
{
Pair tv = (Pair)state;
if(tv.First!=null)
{
Text = (string)tv.First;
}
if(tv.Second!=null)
{
Value = (string)tv.Second;
}
}
}
internal object SaveViewState()
{
if (dirty_t && dirty_v)
return new Pair(Text, Value);
if (dirty_t)
return new Pair (Text, null);
if (dirty_v)
return new Pair(null, Value);
return null;
}
public override bool Equals (object o)
{
ListItem li = o as ListItem;
if (li == null)
return false;
return (Text == li.Text && Value == li.Value);
}
public override int GetHashCode ()
{
return base.GetHashCode ();
}
public override string ToString ()
{
return Text;
}
bool IStateManager.IsTrackingViewState
{
get
{
return IsTrackingViewState;
}
}
void IStateManager.TrackViewState()
{
TrackViewState();
}
object IStateManager.SaveViewState()
{
return SaveViewState();
}
void IStateManager.LoadViewState(object state)
{
LoadViewState(state);
}
}
}
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